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Thread: question about V-22 Osprey

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    Official Thread Jacker Senior Contributor gunnut's Avatar
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    question about V-22 Osprey

    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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    Resident Curmudgeon Military Professional Gun Grape's Avatar
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    Simplicity of design. Less chance of powertrain failure. Imagine the stress put on the shafts if the motor was in the fuselage.

    Thats my SWAG
    Its called Tourist Season. So why can't we shoot them?

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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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    Resident Curmudgeon Military Professional Gun Grape's Avatar
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    Yea, but its a 3d generation airframe using 21st century tech/materials. The layout of the v-22 is the best we had back in the early 1980s
    Its called Tourist Season. So why can't we shoot them?

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    Senior Contributor surfgun's Avatar
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    There is a shaft that connects the two rotors in case of turbine failure.

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    Quote Originally Posted by surfgun View Post
    There is a shaft that connects the two rotors in case of turbine failure.
    Yes it is my understanding if you lose an engine and experience asymmetrical thrust. Which is thrust from the good engine turning a prop and the drag from the dead engine/prop not developing thrust. The aircraft would VMC. That is the engine running will roll the aircraft to the dead engine and loss of control
    .
    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, at 05:52.

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    Military Professional JCT's Avatar
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    Quote Originally Posted by gunnut View Post
    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?
    Couple of ideas:
    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.
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