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#11
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John Halliwell wrote: have been fixed. It's a very complex creature and Bell/Boeing are determined to try to fix it (tilt-rotor being their pet technology) rather than look at other alternatives which may have fewer built in problems. The problems can be traced back to the fact that its a compromise design based around the ships it'll be operating from primarily. The physical size limits of the V22 are totally restricted by the flight deck and elevator clearance issues for the wasp-class LHDs. Rotor diameter was restricted by needing a minimum blade-tip clearance of 12 feet with the island and a 5 foot clearance between the edge of the deck and the osprey's wheels. The blade, wing and naccele folding procedure were limited by the elevator size on the LHDs. Bigger elevators would have meant more room for useful things like bigger engines, 4 blade rotors and a longer wingspan (all of which would have improved the type's performance in both the hover and more importantly, single-engine operation). The previous XV-15 program operated so well for over a decade because it wasn't tooo much airframe for too little installed power/rotor lift. |
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