the il-2 had a 1500 lb armored tub around the cockpit and engine area. doesn't 750 lbs just under the P-39's seat sound a little doubtful ?Speaking of stripping off armour, I found this here. The P-39 Airacobra - Warfare History Network
"Nothing could touch a P-39 used below 15,000-feet" contended American Air Ace Lt. Col. William A. Shomo who flew P-39s, P-40s, F-6Ds, and a P-51D in WWII. He wouldn't have hesitated to have even taken on the vaunted P-38 at lower altitudes because of the extreme maneuverability of the "Flying Cannon." And it could tangle successfully with a Japanese Zero, he argued, if the American pilot kept his airspeed at 300 miles per hour or better so the enemy "couldn't turn inside you."
The Americans in the field experimented with the aircraft throughout the war to continually gain an edge and some additional speed, eventually stripping off a chunk of belly armor under the seat that weighed some 750 pounds. With those modifications, the P-39 could "fly like a bumble bee," asserted Shomo. He and his men especially liked the stinging power of the plane's 37mm cannon that could, if necessary, fire off some 30 rounds in 12 seconds. The hefty warhead had a definite arching trajectory, but one could eventually learn to "drop the shell right into someone's shirt pocket as he walked along the beach," said the ace."
this thread does seem haunted by misprints.
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