Perry is having his 86 engine upgraded to the 93 and up
engine thrust bearing. That requires a rather expensive 
$254.54 new stationary gear and front main bearing/balance
weight assembly. The balance weight will also need to be
re-balanced because the rotor weights are different. Another $190.

His current thrust bearing is showing some small signs of distress
because it takes all the fan thrust. He replaced the original thrust 
bearing with a slightly smaller replacement unit shown on the
right in this picture. The much larger 93 thrust bearing is shown 
on the left. 

Between the cost of this upgrade and a custom direct drive fan
extension he is at about half the cost of a redrive.

If you want to try direct drive make sure you have a 93 or 
later engine converted to a single TO4 turbo. 

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

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