12

Been busting my buns for the last coupling of weeks re-engineering
and rebuilding the TTC dry sump system system. I did NOT do the original design.

Last time we flew the original system we lost a gallon and a half
of oil over board. We got to 10,000 feet in one minute 47 seconds
which exceeds the record. The oil pressure dropped from 130 psi to 50 psi
at 10,000 feet. That worried me. I was not sure what was going
on but I suspected the oil pump was cavatating due to the long length of
the pick up line and the crank case pressure was blowing oil directly
out of the vent line.

I made some modification in the tank to move the vent line away
from the line coming in from the crankcase. The crank case collects
all the rotor cooling oil and any combustion gas  leaking
past the side seals. It is a significant problem in most rotaries.

Here are the before and after pictures.

I had to cut the bottom of the tank off to mount it vertically
in the fuse. I lost about 3 to 4 quarts of capacity but we started
with 4 gallons.

We ran it today but Dan did not fly it. It seems to be working.
No sign of any oil coming out of the radical long vent system.
That long vent is pressurized by the slip stream to about .2 to .4 psi.

It is also tilted up at a 45 degree angle during the climb  so any oil
should run down hill back to the tank.

We will know for sure when Dan flies it again.

Paul Lamar

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