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I think it was in the book "Druid's Circle" where I read that the USAAF asked the RAF for some help dealing with German fighters that would fly over our bombers and drop bombs onto the formation. Adolph Galland described a mission where he did that and when one of his bombs hit a B-17 it took out all three of them.
So the RAF developed a rocket that would be launched from the radio room of B-17's, fired at German aircraft flying overhead to break up their bombing tactics. They never used it in combat. I guess that our escort fighters put a stop to the Germans' air-to-air bombing.
But the Japanese used the same approach. A friend of mine's PB4Y-2 was attacked by George fighters that began by dropping phosphorous bombs, which exploded overhead and did no harm, followed by an intensive 30 min combat in which the two Privateers shot down two George fighters at the cost of some wounded crewmen.
Interesting thing that Bob told me was that they actually removed some of the armor plate in their airplane. The Japanese had learned to make head-on attacks and rounds entering through the windshield tended to rattle around and do more damage than if you just let them go on through, and that is just what happened on their flight - damage done by the round hitting the armored seat back. The wounded radar operator was sent up to an aide station after they got back to their base on Okinawa. After a bit he came back without getting treatment, saying there were plenty of front like troops in worse shape then he was. They medevaced him to Iwo Jima the next day.
That tail design must have been better. They were going to switch to the single tail design on the B-24, but production ended before that could occur. The PB4Y-2 tail looks a lot like the B-32 tail.
I read that before Iwo was invaded a PB4Y2 was attacked and shot down by a dozen or so Zeros flying out of Iwo. The unit sent out three PB4Y-2's and when the Zeros came out they handled them the same way those two Privateers later handled those George fighters - and shot down one Zero after another as they made head on passes. They got about 5 Zeros that day - and were never bothered again when flying in that area.