> Has anyone out their ever measured the flow rate from the oil return
 > line on one of Tracy's redrives? After modifying my Ross drive to oil
 > like Tracy's it is flowing about 8oz per minute @ 2000 RPM. I have no
 > idea if that is good or not. I guess the trade off is how much oil you
 > are taking from the engine. Right now I'm getting about 40 Psi @ 160
 > degrees and 2000 RPM , 65 Psi at 5000 RPM on the gauge. The exciting
 > news is I finally managed to blow off the dust that had been
 > accumulating on the airplane for almost two years, with that big cooling
 > fan that sits up front.
 >
 > Mark Kirkpatrick
 > MSK6 20B
 >
 >
 > Tracy's drive needs the oil flow to cool the plain journal bearings
 > he has in there. The Ross does not use plain journal bearings so it does
 > not need as much oil flow. It has needle bearing everywhere. If the
 > rear seal starts to leak at higher RPM's perhaps you have too much oil.
 > You might want to put a pressure gage on the gear box to monitor
 > the pressure.
 >
 > It does need a helical gear thrust bearing. Have you added that?
 >
 > Congratulation's on getting the engine started.
 >
 > Paul Lamar ...No rotor no motor.

When I redid the drive I put a plain bearing where the rear needle
bearing was to feed the helical gears with oil like Tracy's. My Ross
drive has always had the three stacked thrust bearings behind the sun gear.

Mark Kirkpatrick
MSK6 20B



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