Randy, I was watching some old Nats videos from Windy, and on one, you had a plane with counter rotating props.  I remember reading something in an older magazine that one of the props was spinning freely.  How did you gear that with the engine??  I have no clue whatsover, how you could've done that.

Hi Matt

That is a long long story, There is a belt drive C-R , a Gear Drive CR engine and a fluid drive CR engine, there is also a traction drive that is partially finished, Scott Bair, a friend of mine built several CR motors for his StuntFire airplanes, Many years ago I worked with him on the fluid drive, This is the one we put together and I set it up in a SIG Magnum, after seeing how much Gyroscopic presession it had with large props. The system was..NOT.. free wheeling, it was driven very hard up to over 9000 RPMs, It would take your finger off if you put it in the..so called...free wheeling prop.
It really was only free wheeling as soon as the motor stopped.
The prop was driven just like an automatic transmission drives a car.
The bottom line on that one is it worked very very well on the Magnum, The plane was much much more stable, and had none of the previous GP. It also turn tighter and did the same manouvers at a lower more constant speed.
Scott had a belt drive turning 2 14 inch props on one of his ships, now that one had a wicked sound.

Brett Buck did calculations that show exactly why the geared CR engine kept breaking the gears, If he was to post his graph here you would see that graphicly.
I may try to post picture soon, I have all of the counter rotating engines plus more here in my shop.

Regards
Randy