I just received mine from Brock...It's a "Wonderlink?"<br><br>Brock has a deal with Great Plains for the VW engines and Wonderlink (I don't know if that's how you spell their co.) for the prerotator.<br><br>John-
John,<br><br>At Mentone this year there was a guy there that had an older Dominator that had a drive shaft going to the rotor head. At the engine there was either a friction wheel or a belt, I can't remember. From there a short shaft went forward to a 90 degree gear box. Out the top of the gear box was the drive shaft with universal joints at both ends. The drive shaft was a 2 piece unit that would telescope as pitch input was made. At the rotor head, there was a drive gear just like you would find on a Wenderlich system.<br><br>I had read on the other forum some time ago that this set up was a Brock drive. I don't know if this is true or not.<br><br>Don
You know Al,<br><br>I've always been good at butchering names <br><br>I'm glad yours is short ;D<br><br>As for the prerotator, I think mine is a friction wheel. Haven't really looked at it hard, just inspected the box so far. Next week I'll count the peanuts <br><br>john-
the sliding shaft is a Standard upper unit as in the photos earlier in this thread, and a standard bottom or end unit as in the photos earlier. The difference is the bottom unit is mounted on a hindge to the mast and the rubber puck swings out to contact a disc welded to the front crankshaft pulley on the Subaru engines. The drive between the upper and lower units is done through a drive shaft, which is basically a two piece round tube or square tube that allows the pieces to slide up and down with the rotorheads travel. There is a universal joint at both ends so the shaft doesn't restrict rotorhead movement and so you can move the rotorhead while pre rotating. In a nut shell it is a Wunderlick with out the flex cable and a driveshaft in it's place. I have only seen these units on Subaru ea-81 powered machines.
This is really close to what I saw at mentone. This one looks a lot simpler than the other one - no 90 degree gear box to deal with. Judging by the location of the friction wheel in the last image (which is a different gyro), it looks like there would be a lot of over-driving; too much RPM, not enough torque.
To answer Phil's question, YES The prerotator is close to the mast, although in the picture the stick is all the way back, and the pre rotator clears the mast, but the tele-flex drive wants to hold the head all the way back. I still have to do a hang test, and set-up the blades.
But it seemed kind of close as you mentioned.