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Considering we're talking about a P-63C, from what I have seen beating to death the P-39's weight and balance, removing the cannon, guns and armor would put the aircraft just about on it's @ss, even if you removed armor aft of the C/G. IMO you would have to ballast the aircraft to the factory C/G envelope. Between guns, armor, and other military equipment, I'd guess you're saving about 300-500 pounds, the P-63C had 200 pounds of total armor. Now, with the radios, it gets a little complicated. If the weight reduction is done in the post war years and you want to maintain a radio in the aircraft, you're looking at upwards up to 150 pounds if you remove the receiver, transmitter and IFF, but you're probably replacing that with at least 30 to 40 pounds worth of civilian radios. In today's world radios can be about 10 pounds with wiring and antenna. So consider that.-What did removing all of the military gear do to the weight and balance of the bird? How fast were the stripped down P-63s?