wangzhengtatata 发表于 2013-10-5 11:31 
楼主好好看看书再来说话。基础知识都没搞懂，上来就大论调......
能花几千元买玩具, 买字典不过是几十元怎会不懂英文, 翻译总会有错, 原文原汁原味
the V-22's rotors fold in 90 seconds and its wing rotates to align, front-to-back, with the fuselage. Due to the requirement of folding the rotors their 38 feet diameter is 5 feet less than optimal for vertical takeoff, resulting in high disk loading. Most Osprey missions use fixed wing flight 75 percent or more of the time, reducing wear and tear on the aircraft and reducing operational costs. This fixed wing flight is higher than typical helicopter missions
The CH-47 is powered by two turboshaft engines, mounted on each side of the helicopter's rear pylon and connected to the rotors by driveshafts. The counter-rotating rotors eliminate the need for an anti-torque vertical rotor, allowing all power to be used for lift and thrust. The ability to adjust lift in either rotor makes it less sensitive to changes in the center of gravity, important for the cargo lifting role. If one engine fails, the other can drive both rotors.
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发表于 2013-10-5 01:04
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