http://www.rotorcraft.com/ads/nhc.html
Take a look at this psru. I was unaware of this one.

Marc Wiese

They have been around quite awhile. They use the Chrysler Torque Flite
planetary set. It is a bit heavier than a Ford C6 based planetary.
They also use one way clutches to isolate the torque pulses and the
last I heard about them one of those clutches failed. I think.

Paul Lamar
 
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