The Bell P-39 Airacobra is a fighter produced by Bell Aircraft for the United States Army Air Forces during World War II. It was one of the principal American fighters in service when the United States entered combat.

The original turbo-supercharged XP-39 reached a speed of 390 mph at 20,000 feet (Bell claimed 400 mph), 3 but once the National Advisory Committee for Aeronautics (NACA) implemented its own design changes, performance fell off sharply. After the meddling began, weight was added and some desirable features were removed and the production P-39 ...

P-39 空中眼鏡蛇（英語： P-39 Airacobra ）是一款由美國 貝爾飛機公司設計的戰鬥機，曾在第二次世界大戰期間活躍。 P-39與其他同一時期的戰鬥機設計上最大的差異就是其 發動機 的位置：P-39的發動機是在機身的中央，飛行員的後方，前方的 螺旋槳 則以一根很長 ...

P-39战斗机（英文：P-39 Fighter [7] ，译文：空中飞蛇），是美国一型单座单发平直翼活塞式战斗机。 P-39战斗机作为一种尝试，该机将发动机放在座舱后面，通过一根延长轴驱动机头的螺旋桨，座舱布置相应靠前，从而改变了飞机的构造。

xp-39的主要特点是搭载了艾里逊v-1710-17发动机（1150马力、配备b-5型废气涡轮增压机），以及一门通过螺旋桨主轴射击的25毫米口径桨毂炮。 XP-39技术验证样机 未搭载武器

Bell XP-39 showing the position of the supercharger air intake. The main purpose of this configuration was to free up space for the heavy main armament, a 37 mm (1.46 in) Oldsmobile T9 cannon firing through the center of the propeller …

2024年8月9日 · The Bell XP-39 Airacobra was a single-place, single-engine prototype fighter with a low wing and retractable tricycle landing gears. The airplane was primarily built of aluminum, though control surfaces were fabric covered.

p-39 凭借其重型武器在低空作战，经常被证明是著名的三菱 a6m 零式的强敌. 同样用于 阿留申 人，飞行员发现 P-39 存在各种操纵问题，包括进入平旋的倾向。

2024年12月5日 · 美国陆军同意了，于10月7号订购了一架原型机，将其命名为xp-39，并提出了军方的技术要求： 海平面和6100米高度的最大平飞速度分别为530km/h和644km/h，爬升到6100米高度用时在5分钟内，空重不得超过1815公斤。

Essentially designed around the new Oldsmobile 37mm cannon (not unlike the A-10 Warthog), the XP-39 was the second design which incorporated the 37mm to come from Bell. Their original concept had placed the cannon behind a front mounted engine, pushing the cockpit too far to the rear of the fuselage to be practical.