The I-1430 had continued development problems and could not be delivered in time, so it was replaced by an Allison V-1710-47, similar to that powering the P-39. The other was a switch to the Continental I-1430 engine, which featured an improved overall design developed from the hyper engine efforts, as well as an improved supercharger. The root airfoil, a NACA 0015 on other models of the P-39, was changed to a NACA 0018, to gain internal volume. The resulting XP-39E featured two primary changes from the earlier P-39D from which it was developed. High-altitude performance suffered dramatically as a result, and Bell proposed an experimental series to test out a variety of solutions. While the P-39 had been introduced as an interceptor, later in its development it was decided to reduce the cost and complexity of the engine by removing the turbocharger. However, it was used during World War II by the Soviet Air Force, which had also been the most prolific user of the P-39.ĭesign and development XP-39E
The P-63 was not accepted for combat use by the United States Army Air Forces. Based on the preceding Bell P-39 Airacobra, the P-63's design incorporated suggestions from P-39 pilots and was superior to its predecessor in virtually all respects. The Bell P-63 Kingcobra is an American fighter aircraft that was developed by Bell Aircraft during World War II.
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