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.

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