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Not actually sure what it is called. It is directly driven by a hydraulic motor and has a 2 speed (hi/lo) to select from.

It does not have a reverser on the rotor. :( Thankfully I never needed that option this fall. I'm sure that upgrading the accelerator made a big difference for the rotor's ability to handle slugs.

The rotor drive definitely seemed to hook up the 490 ponies well to the rotor. Like I said before, engine power was not a limiting factor except doing some not fully mature faba beans. Didn't help that snow was in the forecast for about the same time we were hoping to get done!
 

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Yeah I was wondering because I could see both a drive shaft and a hydraulic motor on the rotor drive.
It looks like a differential drive. Most of the power comes from a direct drive on the engine and hydraulic motor is used to vary the speed.
 
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