Which section of the Allison Model 250 engine is attached to helicopter rotor?
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2$\begingroup$ None of it. The gearbox is. $\endgroup$– SimonCommented May 21, 2017 at 11:54
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$\begingroup$ How is it connected to the gear box? $\endgroup$– Kevin CastroCommented May 21, 2017 at 12:12
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$\begingroup$ By a shaft (or mast) to the gearbox output. $\endgroup$– SimonCommented May 21, 2017 at 12:27
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$\begingroup$ Thank You!!! Do you have Allison 250 maintenance manual and can upload by any chance? $\endgroup$– Kevin CastroCommented May 21, 2017 at 12:31
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2$\begingroup$ If you took the engine out of the helicopter and ran it, it would work exactly the same. Why does the main rotor gearbox have anything to do with the operation of the engine and why is your instructor not teaching you, or giving you reference to materials that you can learn from? $\endgroup$– SimonCommented May 21, 2017 at 18:12
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It's not. The engine is connected to a gearbox that transfers power to the rotor head. I don't know of any helicopter where the engine is directly connected to the rotor head. If it were, the helicopter would not be able to autorotate after an engine failure, unless the failure allowed the engine to continue to rotate.
answered Sep 7, 2018 at 12:14
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2$\begingroup$ Not to mention you'd have trouble trying to turn a rotor at 10,000 rpm, never mind whatever higher speed the turbine shaft actually turns at. IIRC, motor rotors turn at something like 250+ rpm. Gear reduction is a requirement. $\endgroup$ Commented Sep 7, 2018 at 12:35
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