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Douglas B-66 Destroyer
The Douglas B-66 Destroyer was a U.S. Air Force Tactical Air Command light bomber based on the United States Navy's A-3 Skywarrior carrier-based heavy attack aircraft. It was intended to replace the Douglas A-26 Invader. An RB-66 photo-reconnaissance version was ordered simultaneously. The USAF B-66 retained the three-man crew from the US Navy A-3, but incorporated ejection seats that the US Navy variant lacked.
==Design and development==
At first the USAF thought the conversion would be an easy matter of removing the carrier-specific features, so no prototypes were ordered, just five pre-production RB-66A models (the reconnaissance mission being considered a high priority). The list of modifications grew, and before long, the supposedly "easy" conversion became what was substantially a new aircraft. Many of the changes were due to the USAF's requirement for low-level operations, while the Navy version had originally been designed and employed as a high-altitude nuclear strike bomber. Two major differences between the A-3 and the B-66 consisted in the types of jet engines used, and the emergency crew egress systems. The A-3 had two J57 turbojet engines, whereas the B-66 had two Allison J71s. The B-66 was equipped with ejection seats whereas the A-3 was not.
The first RB-66A pre-production aircraft flew in 1954, whereas the first production RB-66B aircraft flew in the beginning of 1955.
The basic B-66 "Destroyer" design proved to be a versatile one, and was produced or modified into a variety of other versions, including the EB-66, RB-66, and the WB-66. Likewise, many variants of the A-3 Skywarrior were produced.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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