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LibertarianAtheist_ t1_j7q8buf wrote

Engineering: Jet engines on helicopters (or even small rc ones). How does the rotor "rotate" to make the heli turn; since its attached to the engine?

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saywherefore t1_j7qoynz wrote

The gas turbine (jet engine) has an output shaft. This goes into a gearbox which drives the rotor and tail rotor. The helicopter turns by changing the pitch of the tail rotor, and so the sideways force at the end of the boom.

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LibertarianAtheist_ t1_j7qqwzx wrote

So the main rotor doesn't change position at all? It's all combination with the tail rotor?

u/saywherefore

The rotor to move in relation to the heli's body. "Rotate"
Like the tires of a car turn in relation to the chassis

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[deleted] t1_j7r2t3y wrote

[deleted]

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LibertarianAtheist_ t1_j7r43lp wrote

>rotor pitch

How does the rotor pitch changes without the jet engine moving? I guess that's my original question but I didn't know what words to use.

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doginjoggers t1_j7v0wdo wrote

Individual main rotor blade angles (pitch) are changed by the swash plate. Tilting the swash plate (cyclic input) creates more lift on one side of the rotor. Raising or lowering the swash plate (collective input) creates more or less lift.

https://youtu.be/HxtXXuMhKKc

https://youtu.be/uVjStAxMFEY

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