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Eli

Twin Turbine Planetary Gear

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I am doing some analysis on planetary gears for my rotordynamics class and now I am on a mission to find a picture of gearbox internals from a twin turbine helicopter. Does anyone have a picture or exploded diagram of how two turbines are connected to one main rotor? I am particularly interested in the gear layout.

 

Thanks!

 

Eli

 

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You have two different possibiltes here. There are real twins, or single engine helicopters that added a combiner gearbox to make them twins ( 205/212...350/355)

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They new light twin turbines (427,429) have one single big gear with two input pinions that have freewheeling clutches on them. So there is no planetary reduction at all.

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They new light twin turbines (427,429) have one single big gear with two input pinions that have freewheeling clutches on them. So there is no planetary reduction at all.

 

So the freewheeling clutch allows for any small difference in turbine speed and also allow one turbine to still power the rotor if the other fails?

 

Also, are there additional gear reductions in the transmission? I hope this is not too dumb of a question but I have never seen the inside or a helicopter gearbox.

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