CT Grognard
Posts: 694
Joined: 5/16/2010 From: Cape Town, South Africa Status: offline
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The Japanese Type 91 aerial torpedo went through a number of revisions. The first version introduced in 1931 could only be released at airspeeds below 130 knots and at altitudes no higher than 30m (or just about 100 ft). Only biplanes could safely be handled at such slow airspeeds, the new, fast Kates had to have their landing gear extended. Another tactic for use in shallow-water ports was to drop the torpedo at 100 knots at an altitude of 10m - almost impossible in a Kate (had to lower landing gear and flaps to increase drag). The improved second version in August 1941 could be dropped at in excess of 160 knots at 60m altitude, mainly because of the wooden attachments on the tail fins that were shedded on water entry. Doctrine was to release the torpedo at a range of 800m from the target at 180 knots from a height of 60m - meaning the torpedo entered the water 3.5 seconds later at a speed of 180 knots and an entry angle of 22 degrees 300m from the release point, after which it would take 21 seconds to run the remaining 500m to the target. The torpedo could be dropped at 10m at closer range from the target - from just over 600m away. Kates managed to successfully drop torpedoes at speeds above 200 knots, at times, which surprised the Americans no end at the beginning of the war. Essentially release height is limited by the strength of the propeller, dropped from too high your screw blades start cracking; released too fast from too low and your torpedo skips the surface. A fast torpedo-bombing technique was developed by an IJAAF pilot in a Ki-67 Peggy. He tested releases extensively (he performed over 300 tests!), and found optimal high-speed releases as follows: 1. Start in a deep dive from 5000ft to the water level. 2. At a speed of 250-300 knots, release the torpedo from at least 50 metres but less than 120m (the faster, the higher). 3. At a speed of 200-250 knots, release the torpedo from at least 30 metres. To answer the question posed, a torpedo could be dropped from as low as 5 metres, provided your airspeed's low enough so it doesn't bounce. One thing's for sure, torpedo bombers had big, brass cojones.
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