Matrix Games Forums

Forums  Register  Login  Photo Gallery  Member List  Search  Calendars  FAQ 

My Profile  Inbox  Address Book  My Subscription  My Forums  Log Out

RE: 1000 Pounders versus Battleships

 
View related threads: (in this forum | in all forums)

Logged in as: Guest
Users viewing this topic: none
  Printable Version
All Forums >> [Current Games From Matrix.] >> [World War II] >> War In The Pacific - Struggle Against Japan 1941 - 1945 >> RE: 1000 Pounders versus Battleships Page: <<   < prev  3 4 [5] 6 7   next >   >>
Login
Message << Older Topic   Newer Topic >>
RE: 1000 Pounders versus Battleships - 3/2/2008 4:17:59 PM   
jwilkerson


Posts: 10525
Joined: 9/15/2002
From: Kansas
Status: offline

quote:

ORIGINAL: Panzerjaeger Hortlund


quote:

ORIGINAL: Terminus

How the hell can you dive steeply in a Swordfish carrying a 1600-pound torpedo?


Well, you cant. I suggest paying as much attention to Tiornu on these matters that one would pay to Marky if he was giving his analysis of the Japanese economic model...



I think you're probably off base here. Tiornu is a published author on naval topics, so we'd call him the pro with the bulk of the rest of us being the amateurs.




_____________________________

AE Project Lead
New Game Project Lead

(in reply to Hortlund)
Post #: 121
RE: 1000 Pounders versus Battleships - 3/2/2008 4:24:10 PM   
Hortlund


Posts: 2884
Joined: 10/13/2000
Status: offline

quote:

ORIGINAL: jwilkerson


quote:

ORIGINAL: Panzerjaeger Hortlund


quote:

ORIGINAL: Terminus

How the hell can you dive steeply in a Swordfish carrying a 1600-pound torpedo?


Well, you cant. I suggest paying as much attention to Tiornu on these matters that one would pay to Marky if he was giving his analysis of the Japanese economic model...



I think you're probably off base here. Tiornu is a published author on naval topics, so we'd call him the pro with the bulk of the rest of us being the amateurs.





Heh, oops.

However, I maintain what I earlier wrote regarding why the Bismarck failed to hit the Swordfish, and I also maintain that the structural integrity of a Swordfish would not allow for a steep torpedo-laden dive. Or well, it would not allow the pull-out of the dive anyway.

_____________________________

The era of procrastination, of half-measures, of soothing and baffling expedients, of delays, is coming to a close.
In its place we are entering a period of consequences..

(in reply to jwilkerson)
Post #: 122
RE: 1000 Pounders versus Battleships - 3/2/2008 4:41:08 PM   
jwilkerson


Posts: 10525
Joined: 9/15/2002
From: Kansas
Status: offline
Well go drill into the source Tiornu cited and evaluate the credability of that source and that source's source, etc.! Execute the historiographical process!


But simplistically, thinking that an aircraft in a dive might be able to exceed its maximum "normal" speed by 50 MPH for a short time while diving from approach altitude down to ordnance delivery altitude, does not sound totally implausable.




_____________________________

AE Project Lead
New Game Project Lead

(in reply to Hortlund)
Post #: 123
RE: 1000 Pounders versus Battleships - 3/2/2008 4:43:53 PM   
jwilkerson


Posts: 10525
Joined: 9/15/2002
From: Kansas
Status: offline
BTW - and this applies to more than one poster on this thread. Taking a member's name in vain, as has been done more than once with Marky on this thread, is equivalent to a personal attack, so stop it.



_____________________________

AE Project Lead
New Game Project Lead

(in reply to jwilkerson)
Post #: 124
RE: 1000 Pounders versus Battleships - 3/2/2008 4:45:51 PM   
Terminus


Posts: 41459
Joined: 4/23/2005
From: Denmark
Status: offline
Roger...

_____________________________

We are all dreams of the Giant Space Butterfly.

(in reply to jwilkerson)
Post #: 125
RE: 1000 Pounders versus Battleships - 3/2/2008 5:50:10 PM   
rtrapasso


Posts: 22653
Joined: 9/3/2002
Status: offline
quote:


I personally have not seen any reliable source stating this. I have yet to hear a technical explanation that shows why this would be the case. The best guess I've heard is that the fuze setter might be involved. I'll point out that the standard carrier-based torpedo plane for the expected foe of the German Navy (that would be the French Navy) at the time of Bismarck's design was a plane even slower than the Swordfish. What would be the motivation for the Germans to ignore slow aircraft?


i have read it in more than one place, but at the moment i don't recall where it was... i'll have to look around... perhaps the "overly complex" fire control tracking system and the "unable to track slow planes" is "true-true-unrelated."

Why would they have ignored slow planes?? i can suggest several reasons for this:

1) When the ships were designed, most people were convinced slow moving aircraft (or even aircraft in general) represented a serious threat to battleships, especially battleships at sea ... it wasn't until Taranto, PH, and the demise of the PoW and Repulse that aircraft were taken as a serious threat.

2) Sheer inexperience: why would they design a system so complex and delicate that the firing of (large) guns could knock out the system? (i.e.: definitely the case of radar tracking and fire control, and i *think* in the case of some of AA systems, although i could be wrong about this) - perhaps in their zeal to be able to track fast-moving aircraft, they neglected to pay attention to the low-end of the problem.

i've never seen an explanation of WHY this was the case (although i did read it was a problem) The above about "why" is speculation on my part. i'll try to find references on this, but, alas, when i moved (~4 years ago) i parted with most of my books, and i doubt i have the books i read it in anymore.

But, i will look...

< Message edited by rtrapasso -- 3/2/2008 5:51:10 PM >

(in reply to Tiornu)
Post #: 126
RE: 1000 Pounders versus Battleships - 3/2/2008 6:09:10 PM   
rtrapasso


Posts: 22653
Joined: 9/3/2002
Status: offline
i have found this from on a website
http://warandgame.wordpress.com/2007/08/20/bismarck-not-ready-for-action/
from a reprint of a (heavily referenced) article in "Military History" - this suggests besides any possible design defect in being unable to track slower aircraft (and i will say it is only possible at this point until i find more evidence since memory can be uncertain):

"The question of onboard antiaircraft artillery, however, represented the greatest area of AVKS interest, amounting to nearly one-third (36 of 117) of the specific recommendations or observations offered. The very first of these criticized the location of the main flak control position in the crowded foretop fire-control station, where up to 25 officers and men jammed in a confined and exposed space attempted to coordinate flak guns on both sides of the ship. AVKS instead proposed a significantly reduced post in the foretop and a "flak operations center" below decks, next to the existing forward antiaircraft plotting room, to provide more efficient, telephone-linked coordination with flak batteries. Improvements also were required for the four flak fire-control platforms (one on either side of the control tower, and two midships aft), which housed the critical range, direction, and height finders for the long-range flak batteries. Problems with internal motors had knocked individual towers out of commission during training, in one case for two full days. The batteries controlled by these towers consisted of sixteen 10.5-cm guns in eight twin-mounted locations, four on either side of the superstructure. The twin mounts, however, represented two different models, the older C31 and the more advanced C37. AVKS "urgently desired" the replacement of the older model with the new, but recommended as well changes in the safety switches and other gunsight electrical components of the C37.

Particularly telling were the ordnance experts’ assessments of problems associated with the light flak guns, responsible for defending against close-in attacking aircraft. Not linked to any central fire-control system, the light flak consisted of four battery groupings, one for each of the ship’s quarters. Each grouping included two twin-mount 3.7-cm guns; the forward groupings added one quadruple-mount and two single-mount 2-cm guns each, the aft groupings added three single-mount 2-cm guns. AVKS first criticized as "inadequate" the positioning of the 3.7-cm twin mounts in both forward groupings, as their movement and fields of fire were partially restricted by other parts of the superstructure. Second, they recommended the placement of two additional 2-cm quadruple mounts on the forward searchlight platform "to significantly improve an otherwise weak flak protection forward." Even at this relatively early date, AVKS recognized the need for additional light flak, proposing that new battleships accommodate multiple-mount antiaircraft guns atop their main battery turrets. At the same time, the AVKS found the existing means of supplying ammunition to the rapid-firing, quadruple-mount 2-cm guns on board the Bismarck as "completely inadequate," with improvements "urgently needed."

Finally, the AVKS pointed out that, at least during the trials and training period, the battleship never had received an adequate supply of antiaircraft technical manuals and diagrams: "Six months after the ship’s commissioning, the needed materials were for the most part still lacking." The Bismarck’s flak crews simply had to get by with what they had when departing on a mission from which so much would be demanded of them.22"

i've also found there were problems with some of the other rangefinders: one was removed because it was damaged by seawater (esp at high speed) and never replaced before the last mission.

< Message edited by rtrapasso -- 3/2/2008 6:10:38 PM >

(in reply to rtrapasso)
Post #: 127
RE: 1000 Pounders versus Battleships - 3/2/2008 6:11:28 PM   
Shark7


Posts: 7937
Joined: 7/24/2007
From: The Big Nowhere
Status: offline

quote:

ORIGINAL: jwilkerson

Well go drill into the source Tiornu cited and evaluate the credability of that source and that source's source, etc.! Execute the historiographical process!


But simplistically, thinking that an aircraft in a dive might be able to exceed its maximum "normal" speed by 50 MPH for a short time while diving from approach altitude down to ordnance delivery altitude, does not sound totally implausable.





Well the fact is that every aircraft can achieve a greater than max speed in a dive. There is no question of that. However, where you have to question is if the aircraft can withstand the G-Forces generated by that airspeed. And there is also a point of no return, meaning you reach a point where you cannot manuevre out of the dive. That would certainly be affected by the presense of a 1600 lbs, not particularly aerodynamic torpedo being strapped to the plane's belly.

Any plane can dive much faster than it can fly level, but at what point does the stress become so great that it snaps the wings, and also at what point does it become and uncontrollable dive? IE a dive that cannot be pulled out of.


_____________________________

Distant Worlds Fan

'When in doubt...attack!'

(in reply to jwilkerson)
Post #: 128
RE: 1000 Pounders versus Battleships - 3/2/2008 6:14:37 PM   
rtrapasso


Posts: 22653
Joined: 9/3/2002
Status: offline
Cogitating on the problem, iirc (and of course, i might not be) it was from an article (possibly in a book) about a comparison of the AA fire control systems between different navies... iirc, the problem was that the mechanical computer for the AA didn't have settings low enough for Swordfish - i *think* the lowest setting was 100 kts. or something...

(in reply to rtrapasso)
Post #: 129
RE: 1000 Pounders versus Battleships - 3/2/2008 6:32:00 PM   
Big B

 

Posts: 4870
Joined: 6/1/2005
From: Old Los Angeles pre-1960
Status: offline
That rings a bell - as far as the alleged difficulty in target tracking.
quote:

ORIGINAL: rtrapasso

Cogitating on the problem, iirc (and of course, i might not be) it was from an article (possibly in a book) about a comparison of the AA fire control systems between different navies... iirc, the problem was that the mechanical computer for the AA didn't have settings low enough for Swordfish - i *think* the lowest setting was 100 kts. or something...



_____________________________


(in reply to rtrapasso)
Post #: 130
RE: 1000 Pounders versus Battleships - 3/2/2008 6:41:28 PM   
rtrapasso


Posts: 22653
Joined: 9/3/2002
Status: offline
i have found references, but not reliable ones... one in WIKI said "citation needed"...

(in reply to Big B)
Post #: 131
RE: 1000 Pounders versus Battleships - 3/2/2008 6:55:40 PM   
rtrapasso


Posts: 22653
Joined: 9/3/2002
Status: offline
Here are some interesting comments about "why" the fire control system had design flaws - there is passing references to the overly complex and delicate systems (this is from http://www.navweaps.com/index_tech/tech-044.htm):



"OK. WWI is lost. The RMA is disbanded. The Versailles Treaty is signed and the fleet scuttled. The RMA-personnel reduced by 80% of the original number and with the possibility of additional reductions in the future. The Weimar Republic is born.

The new politicians of the Weimar Republic never want war again. So, they do not spend any more money on the military than is absolutely necessary. Great reductions in the active fleet are mandated by the Versailles Treaty, putting many officers at loose ends. There are now more active officers than jobs. During this phase of reorganization in the entire military structure, the design groups and the fleet personnel are merged to some extent. So, new positions for the former ship-officers are created inside the RMA, which is now renamed Marineamt (MA). This means that the inner workings of the design team are now populated with front-line officers.

After 1933 the number of the (now) MA staff grew rapid and constant. But as we discussed earlier, front-line officers in command. Most of the new, fresh, young and inexperienced designers never saw a warship from the inside. All they had to have is a Master's Degree in engineering. The design work was more and more fragmented, with two or more groups working on the same problem. So they had "design parties" led by technically inexperienced front-line officers, young ambitious designers without onboard-experience and finally design-questions ripped from the overall context.

The outer environment is now changed as well. The Versailles treaty knocked the German navy down to that of a 3rd or 4th rate nation. If you don't want to play this role, but you are saddled by the treaty, then you have to invent something new and upgrade the old things to become the new cutting edge. You cannot just follow what the other nations do – there's no money, no political support and the dictate of Versailles prohibits much of what was formerly done. You must create things that are better than what other navies have. This mindset leads to such things as the comparatively high performance 11" gun, the diesel powered Panzerschiffes and the all-welded hull designs. But the bad news is that the overall design-process is turned upside-down. Now, things look like this:

a) No political overview. The dictate was that: "The Fleet must be ready for combat within 8 years." But for the questions of: "For what? Against whom? For how long? Strategy and Tactics?" there are no answers. This results in an absence of political guidance for the MA, thus the directors are free to follow their own ideas.

b) No technical concepts that need to be followed. The major ships were ALL just prototypes. Some good, some bad, none outstanding. Why? We will return to this a little later.

c) The atmosphere inside the MA is poisoned. Ex-military men, with no design experience, are now in charge. No longer was the RMA (now MA) mainly a department of uniformed civilians. It had now morphed into a barracks square, with the iron discipline that implies. You need time-in-rank to get to the next level of command, not technical experience.

d) Starting perhaps as early as 1933, but absolutely after the signing the 1936 London treaty, the engineers were under constant and growing pressure to deliver RESULTS.

What were the effects of this upheaval?

1. Design team leaders who are not able to decide between good and bad ideas, ones who cannot provide guidance in technical questions.
2. Teams whose junior members are not aware of "how a warship must perform," with no ideas about what is really important and what is a trivial concern.
3. Rivalry between the teams, overestimating their individual importance in the design process.
4. Inventions just for having inventions with no one asking if about if they are useful or not.

For example, think of how you would behave in this situation. If you are forced to something quick, would you also combine it with some totally new techniques or designs? Most likely, the answer would be no. You would most likely do it the same way you have done things in the past because you are familiar and comfortable with those "tried and true" concepts. Likewise, the German designers. They were forced to produce instant results by the "seagoing branch" inside the MA. And the MA too often demanded the impossible. Unlike during Adm. Tirpitz's time in command, the MA did not care much about what potential opponents were doing. The concept was, "didn't we prove with the Panzerschiffe that we are capable of producing the impossible?" So, the leaders of the MA continued to ask for the impossible. See the Cruiser "P" design concepts. This combination of demands was horrible for the designers. The solutions of the design teams leaned on the "conservative, iron rules" of IM design (because they must deliver quick results) in combination with some welding and power plants of higher performance. But the end result was that these demands conflicted to such an extent that the ships cannot be built.

One can clearly see the influence of the "fleet" in the designs of Hipper, the Scharnhorst and the Bismarck classes of warships. Although the Battle of Jutland proved that the shooting of German ships was quite adequate, the lack of a coordinated, centralized fire-control such as the British had was well known by the "fleet" after this sortie. Result: The Fleet wanted the a Fire Control System that would be the best, the utmost, the totally superior Fire Control System. So, the MA spent a great deal of time and resources into developing such a system. The end result was an overly complex, very heavy Firing director and very sensitive machinery. This development process continued until the point of chaos was reached. For example, the new battleships Scharnhorst and Gneisenau were found to be incapable of shooting their main guns in the autumn 1939. This could only be corrected after 22,000 yards (!) of useless electrical wires were removed and major modifications were made to the Fire Control circuits and mechanisms.

A second example would be the anti-aircraft FCS on the Bismarck. The company that built the computers for this proudly announced that only a dozen of their 20,000 employees were capable of assembling this machine. When you think about this, there is really no better way to express the fact that this inherently means that the computer won't work properly in actual service. All in all, they (the fleet branch) wanted every thing PERRRRFECCCCT. But if you do it, you often are 10 years too late. The DP-gun wasn't produced because the fleet branch wanted them stabilized in three dimensions – why not start with a 2-d stabilized version and see how it works? The Scharnhorst and Gneisenau were outfitted with every gun and FC gimmick (useful or not) that was available. Result: An overloaded design. A few tons more and the main armor belt would loose its function as it would wind up below the waterline. Likewise, the upperworks of the superstructures were the favorite playground of every ambitious technical naval officer who was in command in the MA – I'm sure you noticed the different deck layout for each of these two ships. This is the reason for it. Remember – not technical qualification, but rank is required for all decisions.

At the battle off the Norwegian coast, did the Scharnhorst and Gneisenau perform well? The answer is no.

The situation facing the Scharnhorst and Gneisenau was nearly textbook. In theory, this sortie should have turned out to be a "piece of cake," a clear victory within a couple of minutes. Look at the conditions:

- Good visibility
- Normal sea conditions for that region
- 18 large caliber guns vs. 6 on the Renown
- Distance to opponent about 150 hm (16,400 yards), perfect for main guns and secondaries.
- The German shells could easily defeat the Renown's armor at this range.
- A chance for "crossing the T."

Instead of that, the Scharnhorst and Gneisenau bugged out, showing good shooting only in the first few minutes of the engagement. Everything after changing course to 70° was a slow, but constant waste of ammo. The longer the battle lasted, the worst became the shooting.

I don't want to pick on the ships commanders or say they should have done things differently. I think they did not have much of a choice - due to the bad seagoing abilities of their ships in combination with extra-sensitive guns and overly-complex FC. Where did these deficiencies come from? From overloading the ships and poor performance by the equipment. Where did this come from? From "crazy freaks" inside MA!

As a further example, the Bismarck wasn't equipped with turbo-electric propulsion because the Navy demanded the capability of going from full ahead to full astern within ONE minute. I can see no reason why a battleship intended for commerce raiding should be capable of doing this.

In summary, compared to today's successful corporations, the MA lacked a "passion for excellence" and they were very far away from having a "self-correcting-process" which would allow them to learn from past mistakes. Their management was arrogant and technically incompetent. They lacked any overall strategic or technical guidance. It was a mixture of "we want revenge" and a "I have a wish" party. This was supported from the (sorry) "goddamned" German discipline which kept the designer from protesting until it was too late. "

< Message edited by rtrapasso -- 3/2/2008 6:57:06 PM >

(in reply to rtrapasso)
Post #: 132
RE: 1000 Pounders versus Battleships - 3/2/2008 7:03:06 PM   
Big B

 

Posts: 4870
Joined: 6/1/2005
From: Old Los Angeles pre-1960
Status: offline
I "think" the story of the AA Directors being incapable of tracking slow-moving targets was first quoted in the book by Burkhard Baron von Mullenheim-Rechberg, "Battleship Bismarck, A Survivor's Story"

I'm not saying it is or isn't true - just that I believe that was where I read the statement, I'll look for the book.

_____________________________


(in reply to rtrapasso)
Post #: 133
RE: 1000 Pounders versus Battleships - 3/2/2008 7:04:55 PM   
rtrapasso


Posts: 22653
Joined: 9/3/2002
Status: offline
Here is a pretty good reference:

from
http://groups.google.com/group/soc.history.war.world-war-ii/browse_thread/thread/6a1783b6194b2a6a

"German electrical engineers and scientists had perfected an amplifying
device called the 'magnetic amplifier' today refered to as a saturable
reactor. This rugged device made possible the Fi.103/B1, A4/V2 and
for the german navy remote power driven turrets free from the fear of
thermionic vacuum tube failure. The systems of the Prinz Eugen
rather surprised the USN and untill the mid to late 1950s
revolutionized power electronics until the event of solid state power
electronics. Another unique aspect of the German systems was the
large number of computers/directors which allowed the ships to engage
a larger number of targets. Due to the restrictions of the Versailes
treaty and the fear of war with Poland in the 1930s the Germans saw
fire control as a manner of improving the odds.
(The bismark had these systems but the front set of 4 turrets had been
upgraded to a faster traversing design while the rear had not, when
the Swordfish approached the Fire Control Systems did not take into
account the slower traversing units, thus the swordfish got through
the heavy FLAK at which point the inferior German medium 37mm let them
through) "

(in reply to Big B)
Post #: 134
RE: 1000 Pounders versus Battleships - 3/2/2008 7:08:57 PM   
rtrapasso


Posts: 22653
Joined: 9/3/2002
Status: offline
So, the answer seems to be partly true*... if this reference is to be believed.

EDIT: *The AA couldn't track the Swordfish, but it wasn't particularly because they were flying too slow, it was because they (probably) couldn't track ANY aircraft due to this problem...

< Message edited by rtrapasso -- 3/2/2008 8:58:58 PM >

(in reply to rtrapasso)
Post #: 135
RE: 1000 Pounders versus Battleships - 3/2/2008 7:10:04 PM   
Big B

 

Posts: 4870
Joined: 6/1/2005
From: Old Los Angeles pre-1960
Status: offline
Now that would make sense - a mis-match of equipment that did not produce an accurate firing solution. Not a system that was designed to shoot down faster moving aircraft and ignore slow aircraft.
quote:

ORIGINAL: rtrapasso

Here is a pretty good reference:

from
http://groups.google.com/group/soc.history.war.world-war-ii/browse_thread/thread/6a1783b6194b2a6a

"German electrical engineers and scientists had perfected an amplifying
device called the 'magnetic amplifier' today refered to as a saturable
reactor. This rugged device made possible the Fi.103/B1, A4/V2 and
for the german navy remote power driven turrets free from the fear of
thermionic vacuum tube failure. The systems of the Prinz Eugen
rather surprised the USN and untill the mid to late 1950s
revolutionized power electronics until the event of solid state power
electronics. Another unique aspect of the German systems was the
large number of computers/directors which allowed the ships to engage
a larger number of targets. Due to the restrictions of the Versailes
treaty and the fear of war with Poland in the 1930s the Germans saw
fire control as a manner of improving the odds.
(The bismark had these systems but the front set of 4 turrets had been
upgraded to a faster traversing design while the rear had not, when
the Swordfish approached the Fire Control Systems did not take into
account the slower traversing units, thus the swordfish got through
the heavy FLAK at which point the inferior German medium 37mm let them
through)
"



_____________________________


(in reply to rtrapasso)
Post #: 136
RE: 1000 Pounders versus Battleships - 3/2/2008 7:20:31 PM   
rtrapasso


Posts: 22653
Joined: 9/3/2002
Status: offline
i am not sure this is the entire story, but i've spent enough time on it for now... i still remember the bit about the 100 kt. limit, but maybe that was for the 37 mm AA...

(in reply to Big B)
Post #: 137
RE: 1000 Pounders versus Battleships - 3/2/2008 8:21:29 PM   
rtrapasso


Posts: 22653
Joined: 9/3/2002
Status: offline
quote:

ORIGINAL: Big B

I "think" the story of the AA Directors being incapable of tracking slow-moving targets was first quoted in the book by Burkhard Baron von Mullenheim-Rechberg, "Battleship Bismarck, A Survivor's Story"

I'm not saying it is or isn't true - just that I believe that was where I read the statement, I'll look for the book.


Let me know if you find anything there... i did read an article based on Ludovik Kennedy's "Pursuit" that quotes a German gunner saying that the Swordfish were flying "too low and slow for him"... but i don't know if that is based on something more or not.


< Message edited by rtrapasso -- 3/2/2008 8:55:52 PM >

(in reply to Big B)
Post #: 138
RE: 1000 Pounders versus Battleships - 3/2/2008 9:11:32 PM   
Tiornu

 

Posts: 1126
Joined: 4/1/2004
Status: offline
quote:

i have found this from on a website

I like Mulligan. This particular article seemd a bit on the Bismarck-bashy side, but it makes good points about the level of training and the AVKS report. I believe the AVKS report is available online at one of the Bismarck sites.

quote:

perhaps the "overly complex" fire control tracking system and the "unable to track slow planes" is "true-true-unrelated."

The Germans definitely seem to have suffered from a severe case of gizmo-mania. Peter Lienau, who wrote the navweaps article you linked to, once commented on Bismarck's gun directors (for the main battery?) and said people kept adding extra gadgetry until the directors were multiple tons overweight, so much so that their bearing races would shave of sections of the bearings.
I always pay attention to Peter's writings. That's a very good article.

quote:

The bismark had these systems but the front set of 4 turrets had been
upgraded to a faster traversing design while the rear had not, when
the Swordfish approached the Fire Control Systems did not take into
account the slower traversing units

I believe I alluded to this earlier. Half the battery had mounts derived from 8.8cm mounts, and the others had new mounts developed specifically for the 10.5in guns.
The German system of RPC was not a big success, at least for the big guns. I haven't looked to see if this applies to the heavy AA. The French experience may have been similar. With those giant quad mounts, it was easy to burn out the motors trying to make fine corrections.

quote:

I also maintain that the structural integrity of a Swordfish would not allow for a steep torpedo-laden dive.

I believe Lamb, in the same section where the previously cited quotes are found, also commented that you wouldn't want to push it much past 200mph unless you enjoyed shedding your wings.

quote:

two Swordfish approached the port side of the Bismarck so low that the 105mm and 37mm guns could not effectively maintain fire at them

This is very interesting. Another myth I've heard is that the guns couldn't depress low enough to engage, and I'll bet this is the source for that. In commenting on the relative rarity of hits on Bismarck's belt, Bill Jurens observed that the low trajectory fire to which the ship was subjected could easily hit swells before reaching the target. Sounds related. It may be that many of the rounds fired at the Swordfish hit the ocean before reaching the airplanes.

(in reply to rtrapasso)
Post #: 139
RE: 1000 Pounders versus Battleships - 3/2/2008 9:19:08 PM   
rtrapasso


Posts: 22653
Joined: 9/3/2002
Status: offline
quote:

new mounts developed specifically for the 10.5in guns.


Is this a new kind of AA gun??

(cm, not inch)

BTW - i ran across some of your stuff out there while looking for this info... unless another person is also posting under "Tiornu"...

(in reply to Tiornu)
Post #: 140
RE: 1000 Pounders versus Battleships - 3/2/2008 9:47:21 PM   
Howard Mitchell


Posts: 449
Joined: 6/3/2002
From: Blighty
Status: offline

quote:

ORIGINAL: Big B

I "think" the story of the AA Directors being incapable of tracking slow-moving targets was first quoted in the book by Burkhard Baron von Mullenheim-Rechberg, "Battleship Bismarck, A Survivor's Story"

I'm not saying it is or isn't true - just that I believe that was where I read the statement, I'll look for the book.


If you look at my previous post you will see that I was quoting the good Baron:

‘the fact that the Bismarck did not shoot down a single one of the relatively large number of close, low-flying enemy planes has puzzled both experts and laymen. Ostensibly, such a complete failure ‘should not have happened’ and I cannot offer any plausible explanation for this apparently poor performance’.

Footnote on page 209 of the expanded 1991 edition.


_____________________________

While the battles the British fight may differ in the widest possible ways, they invariably have two common characteristics – they are always fought uphill and always at the junction of two or more map sheets.

General Sir William Slim

(in reply to Big B)
Post #: 141
RE: 1000 Pounders versus Battleships - 3/2/2008 9:57:05 PM   
Big B

 

Posts: 4870
Joined: 6/1/2005
From: Old Los Angeles pre-1960
Status: offline
Yes, I must have missed that.

But I was thinking (maybe I just have a bad memory) that in that book there was a direct statement saying that the director system "was not designed to track slow moving aircraft" - or something similar. Which is not quite the same as saying "I cannot offer any plausible explanation for this apparently poor performance".

The book I am thinking of is here at the house, and Mullenheim-Rechberg is featured in it - so I assume it's the same book. As soon as I can get my hands on it I'll go through it and see if I can find the quote I mentioned above (right now it is in a room where someone is sleeping who works graveyard and I don't want to disturb him).
Or - maybe I'm just wrong and no such quote exists.


quote:

ORIGINAL: Howard Mitchell


quote:

ORIGINAL: Big B

I "think" the story of the AA Directors being incapable of tracking slow-moving targets was first quoted in the book by Burkhard Baron von Mullenheim-Rechberg, "Battleship Bismarck, A Survivor's Story"

I'm not saying it is or isn't true - just that I believe that was where I read the statement, I'll look for the book.


If you look at my previous post you will see that I was quoting the good Baron:

‘the fact that the Bismarck did not shoot down a single one of the relatively large number of close, low-flying enemy planes has puzzled both experts and laymen. Ostensibly, such a complete failure ‘should not have happened’ and I cannot offer any plausible explanation for this apparently poor performance’.

Footnote on page 209 of the expanded 1991 edition.




_____________________________


(in reply to Howard Mitchell)
Post #: 142
RE: 1000 Pounders versus Battleships - 3/2/2008 10:21:20 PM   
Howard Mitchell


Posts: 449
Joined: 6/3/2002
From: Blighty
Status: offline

quote:

ORIGINAL: Shark7


quote:

ORIGINAL: jwilkerson

Well go drill into the source Tiornu cited and evaluate the credability of that source and that source's source, etc.! Execute the historiographical process!


But simplistically, thinking that an aircraft in a dive might be able to exceed its maximum "normal" speed by 50 MPH for a short time while diving from approach altitude down to ordnance delivery altitude, does not sound totally implausable.





Well the fact is that every aircraft can achieve a greater than max speed in a dive. There is no question of that. However, where you have to question is if the aircraft can withstand the G-Forces generated by that airspeed. And there is also a point of no return, meaning you reach a point where you cannot manuevre out of the dive. That would certainly be affected by the presense of a 1600 lbs, not particularly aerodynamic torpedo being strapped to the plane's belly.

Any plane can dive much faster than it can fly level, but at what point does the stress become so great that it snaps the wings, and also at what point does it become and uncontrollable dive? IE a dive that cannot be pulled out of.



Airspeed itself does not generate any G-force, only the rate at which the aircraft pulls out of the dive. If the aircraft pulled out gently then the G-force would be lower than in an abrupt pull-out. Pilots know the limits which their aircraft can manage with given loads (including 1600 lb. torpedoes), so I don't see this as a problem. The limit at which an aircraft takes structural damage from diving too fast varies from aircraft to aircraft. Before that point, only in some designs does it ever become a dive which cannot be pulled out of (given enough altitude). The P-38 is perhaps the most famous example of this, but few aircraft of the period were affected to the same degree iand many not at all.

The Swordfish was purpose-built as a carrier aircraft and so, unlike converted land-planes like the Seafire, was built to take a lot of stress. Don't be fooled by its antiquated looks - it had a strong airframe and was used for dive-bombing attacks. Terence Horsely in his book Find, Fix and Destroy, quoted in British Naval Aircraft since 1912 by Owen Thetford, said of it:

‘You could pull a Swordfish off the deck and put her in a climbing turn at 55 knots. It would manoeuvre in a vertical plane as easily as it would straight and level and even when diving from10,000 feet the ASI never rose much beyond 200 knots. The controls were not frozen rigid by the force of the slipstream and it was possible to hold the dive within 200 feet of the water’.

ASI is indicated air speed; the actual airspeed would have been somewhat greater. The bomb-equipped Swordfish at Taranto dropped their bombs from dive from 1,500 feet (British Naval Aviation, by Ray Sturtivant). Not very high, but if your maximum dive speed is around 200 knots probably high enough!


_____________________________

While the battles the British fight may differ in the widest possible ways, they invariably have two common characteristics – they are always fought uphill and always at the junction of two or more map sheets.

General Sir William Slim

(in reply to Shark7)
Post #: 143
RE: 1000 Pounders versus Battleships - 3/2/2008 10:26:02 PM   
Howard Mitchell


Posts: 449
Joined: 6/3/2002
From: Blighty
Status: offline

quote:

ORIGINAL: Big B

Or - maybe I'm just wrong and no such quote exists.



No, I'm sure you are right Big B, I've read the same myself

...but so long ago that I can't remember where. Probably Kennedy's Pursuit of the Bismarck. but I've no time to look it up right now.


_____________________________

While the battles the British fight may differ in the widest possible ways, they invariably have two common characteristics – they are always fought uphill and always at the junction of two or more map sheets.

General Sir William Slim

(in reply to Big B)
Post #: 144
RE: 1000 Pounders versus Battleships - 3/3/2008 12:46:27 AM   
Big B

 

Posts: 4870
Joined: 6/1/2005
From: Old Los Angeles pre-1960
Status: offline
Well, at this point I have to think I'm wrong about any such statement being made. I've looked through the book and I can't find anything.
I think I have been taken-in by Urban Legend on that one.

However, what rtrapasso quoted above in post #133, about the mis-match of AA gun-directors with the slower moving rear AA turrets, seems logically to me to be the original source of legend about the inability of Bismarck's AA directors engaging slow aircraft.

B
quote:

ORIGINAL: rtrapasso

quote:

ORIGINAL: Big B

I "think" the story of the AA Directors being incapable of tracking slow-moving targets was first quoted in the book by Burkhard Baron von Mullenheim-Rechberg, "Battleship Bismarck, A Survivor's Story"

I'm not saying it is or isn't true - just that I believe that was where I read the statement, I'll look for the book.


Let me know if you find anything there... i did read an article based on Ludovik Kennedy's "Pursuit" that quotes a German gunner saying that the Swordfish were flying "too low and slow for him"... but i don't know if that is based on something more or not.



quote:

ORIGINAL: Howard Mitchell


quote:

ORIGINAL: Big B

Or - maybe I'm just wrong and no such quote exists.



No, I'm sure you are right Big B, I've read the same myself

...but so long ago that I can't remember where. Probably Kennedy's Pursuit of the Bismarck. but I've no time to look it up right now.




_____________________________


(in reply to Howard Mitchell)
Post #: 145
RE: 1000 Pounders versus Battleships - 3/3/2008 1:27:13 AM   
Feinder


Posts: 6589
Joined: 9/4/2002
From: Land o' Lakes, FL
Status: offline
I gotta say, it's mildly amusing to see how often threads in this forum turn into squabbles about the Bismark.  Somebody ought to just add her into a Mod, and throw in Prinz Eugen while they're at it, and be done with it.

Let them survive the glorious WitP game engine, and resolve all these debates.

-F-

_____________________________

"It is obvious that you have greatly over-estimated my regard for your opinion." - Me


(in reply to Big B)
Post #: 146
RE: 1000 Pounders versus Battleships - 3/3/2008 1:41:36 AM   
Tiornu

 

Posts: 1126
Joined: 4/1/2004
Status: offline
quote:

Is this a new kind of AA gun?

Hee! I know I've discussed this topic too many times because I've made that exact mistake in this exact context before.

(in reply to rtrapasso)
Post #: 147
RE: 1000 Pounders versus Battleships - 3/3/2008 2:31:08 AM   
Big B

 

Posts: 4870
Joined: 6/1/2005
From: Old Los Angeles pre-1960
Status: offline

quote:

ORIGINAL: Feinder

I gotta say, it's mildly amusing to see how often threads in this forum turn into squabbles about the Bismark. Somebody ought to just add her into a Mod, and throw in Prinz Eugen while they're at it, and be done with it.

Let them survive the glorious WitP game engine, and resolve all these debates.

-F-

Since we've gone this far -
I may as well point out that according to the Ballard Expedition Bismarck was definitely "scuttled".
well, that's what the Wiki says anyway

[How's this for stirring the pot! ]

Controversy

The second Bismarck expedition in 2001 was Anglo-American and funded by a UK TV channel. It followed-on from the same team's prior discovery of the long-lost wreckage of Hood which was located and filmed for the first time.

The Anglo-American team (David Mearns and Bill Jurens from the USA and Professor Eric Grove from the UK) conducted its own sonar survey from scratch to find the Bismarck wreck site, based solely on available information that it was resting at the foot of the only undersea volcano in that area. Then they used ROVs to film the hull externally and concluded that the ship sank due to combat damage, having received numerous artillery and torpedo hits from the British.

Ballard criticised this documentary, citing what he considered nationalistic, biased research of limited historic value due to lack of thoroughness. A new American expedition visited the site using smaller and more agile ROVs. These provided some interior shots of Bismarck for the first time, which were aired as part of a one-hour documentary film on the National Geographic Channel (NGC).

The third survey found no underwater penetrations of the ship's fully-armoured citadel and only four direct hit holes on it above the waterline, all of them on one side, as delivered by Rodney's 16 inch (406 mm) guns. Huge dents showed that the 14 inch (356 mm) shells fired by King George V bounced off the German belt armour[citation needed]. Interior ROV footage showed that the "terrible destruction" the Anglo-American expedition reported was in fact the torpedo bulges, which were designed to absorb the energy of torpedoes and plunging shells. Underneath the torn bulge sheeting, the ship's 320 mm (12.6 inch) thick main belt armour appeared to be intact.

The American expedition's final conclusions were strikingly different from the findings of the Anglo-American team. They estimated that Bismarck could still float for at least a day when the British vessels ceased fire and could have been captured by the Royal Navy. They concluded the direct cause of sinking was due to scuttling: sabotage of engine-room valves by her crew, as claimed by German survivors. A detailed look at a modern computer analysis of the hull's eventual impact on the sea bottom explains some damage as a result of hydrodynamic impact shock inside the ship, which was still apparently girded by an uninterrupted curtain of armour.

In all 2,876 shells of various calibres were fired by the British ships. Approximately 300-400 hit. Only two hits fully penetrating the main armour were located. These holes were on the starboard side, suggesting that they were 16-inch shells from Rodney. Two other penetrations above the main armour belt were found on the port side, and appeared to be by 14-inch shells. In all 714 14-inch and 16-inch shells were fired by the two battleships, of which about 80 hit Bismarck. Only four penetrated the belt but in successive hits the shells had destroyed A turret, B turret, each gun director and the bridge.

When senior Bismarck survivor the late Baron von Müllenheim-Rechberg was asked for his opinion on the controversy in a British television interview he simply replied politely, "Both sides sank the Bismarck."

And a full 3 page article from the NY Times:
http://www.nytimes.com/2002/12/03/science/03BISM.html?ex=1039873338&ei=1&en=56ffc6359ff9905e

< Message edited by Big B -- 3/3/2008 3:04:57 AM >


_____________________________


(in reply to Feinder)
Post #: 148
RE: 1000 Pounders versus Battleships - 3/3/2008 2:34:46 AM   
Shark7


Posts: 7937
Joined: 7/24/2007
From: The Big Nowhere
Status: offline
You know, I think we're all looking at the wrong thing when trying to determine how fast the Swordfish were moving on their attack runs. We are looking at the plane, which in this case is totally irrelevant.

The key factor here is not how fast the plane is capable of going, but rather what speed the plane must be going to successfully release a torpedo. That is the limiting factor. And I have no clue as to what that speed is, nor have I been able to find that info. If anyone can provide it, then we can determine if the Swordfish attack speed had any role in the tracking problem.

@Tiornu: Yes, that is what I was getting at. The dive itself isn't necessarily a problem for the plane (though it might be for the pilot), its the g-force and stress on the frame when you try to pull out of it. There comes a point where you can't pull out of the dive without snapping off the wings, or having to do it so gently that you run into the ground before being able to level off. That is what I meant by the uncontrollable dive...the point at which you can't escape the dive without destroying the aircraft or running straight into the ground.

_____________________________

Distant Worlds Fan

'When in doubt...attack!'

(in reply to Tiornu)
Post #: 149
RE: 1000 Pounders versus Battleships - 3/3/2008 4:49:58 AM   
Tiornu

 

Posts: 1126
Joined: 4/1/2004
Status: offline
quote:

Underneath the torn bulge sheeting, the ship's 320 mm (12.6 inch) thick main belt armour appeared to be intact.

Since there is no 320mm belt armor under the bulge, you know something's wrong.
Bill Jurens, who was the naval architecture expert on two Bismarck expeditions counted a few penetrations of the armor belt but found no signs of large shells failing against the belt.

quote:

That is the limiting factor.

A speed of 100mph would certainly be within the limitations of the British torpedo. It was even within the limits of the famously limited American Mk 13 (110 knots and 50 feet).

(in reply to Big B)
Post #: 150
Page:   <<   < prev  3 4 [5] 6 7   next >   >>
All Forums >> [Current Games From Matrix.] >> [World War II] >> War In The Pacific - Struggle Against Japan 1941 - 1945 >> RE: 1000 Pounders versus Battleships Page: <<   < prev  3 4 [5] 6 7   next >   >>
Jump to:





New Messages No New Messages
Hot Topic w/ New Messages Hot Topic w/o New Messages
Locked w/ New Messages Locked w/o New Messages
 Post New Thread
 Reply to Message
 Post New Poll
 Submit Vote
 Delete My Own Post
 Delete My Own Thread
 Rate Posts


Forum Software © ASPPlayground.NET Advanced Edition 2.4.5 ANSI

1.234