Is there a reason why the 2 engines are housed in a nacelle at the tip of the wings and rotate with the rotor/propeller? Why not house the engines in a fixed mount near the fuselage and only rotate the rotor/propeller at the wingtips?
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question about V-22 Osprey
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Future tilt-rotor designs are moving towards just this suggested change. Some keep the engines at the end of the wings, and some use driveshaft linkages from the fuselage, but either way it avoids pointing the engine exhaust down toward the deck, and makes for a less complicated mechanism to rotate the prop direction.
The Bell V-280 FVL concept is a good example, with materials available for public consumption.
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Originally posted by surfgun View PostThere is a shaft that connects the two rotors in case of turbine failure.
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From wiki:The V-22's two Rolls-Royce AE 1107C engines are connected by drive shafts to a common central gearbox so that one engine can power both proprotors if an engine failure occurs.[75] Either engine can power both proprotors through the wing driveshaft.[74] However, the V-22 is generally not capable of hovering on one engine.[110] If a proprotor gearbox fails, that proprotor cannot be feathered, and both engines must be stopped before an emergency landing. The V-22's autorotation characteristics are poor partly because the rotors have low inertia.[Last edited by Dazed; 17 May 17,, 05:52.
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Originally posted by gunnut View PostIs there a reason why the 2 engines are housed in a nacelle at the tip of the wings and rotate with the rotor/propeller? Why not house the engines in a fixed mount near the fuselage and only rotate the rotor/propeller at the wingtips?
1. It looks cooler.
2. Job security - more complexity means more stuff to break, requiring more industry techs to assist.
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I was in a Acquisition Logistics class for two weeks recently at Pax River. Had a bunch of folks in there from the V-22 program office, including 2 pilots.
They explained the layout it was exactly as the Gunny explained. That was the technology of the time.
In their next generation VTOL they will use the fuselage mounted engines design.“Loyalty to country ALWAYS. Loyalty to government, when it deserves it.”
Mark Twain
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Now it looks like the UAE may be getting in line for Osprey bandwagon while the UK says they either don’t have the money or requirement for this versatile bird.
https://www.janes.com/article/86794/...in-middle-east
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