Geared Drives 200Z PSRU For Subaru

At the time this was the worlds only Subaru on an RV9A using a hydraulic constant speed prop. This prototype unit has all of the same features of the original Geared Drives PSRU including its own oil reservoir, oil pump and filtration system, drive port for hydraulic prop governor, and flywheel and centrifugal clutch assembly. This airplane with the P2 prototype Geared Drives PSRU can be seen at Sun n Fun Air Show, Lakeland, FL, April 21-26, 2009. Look for the Geared Drives booth N52 for directions the aircraft location.

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Geared Drives 200Z PSRU for Subaru
Test running the Geared Drives PSRU for Subaru on our test engine mule, Frankenstein. Running for eight hours this day, the oil temperature is cool enough you can wrap your hand around the oil filter and it is barely over body temperature. Swinging a 72" Hartzell two blade hydraulic prop at full pitch, the gearbox is performing perfectly and ready to take its place as a retrofit to Eggenfellners gearbox. Torsional harmonics are resolved via the Geared Drives centrifugal clutch system.

Truyeart LS1 Engine for his RV-10 Starts for the first time!
Another Geared Drives LS1 engine package for RV-10 roars to life for the very first time! The engine starts easily and runs at low RPM since it is not good for it to run without the load of a propeller on it. We run it long enough to test the systems, check for leaks, test the PSRU etc. At the very end of the video you can see the breather on the PSRU kick over the little bit of overage of oil as it seeks its natural level in the gearbox. This is normal for a first run up.