I thought I had tried everything with the OS .40 engine. Today it ran very slightly better on 15% nitro fuel. I tried every prop available, every tank, lowered compression ratios but the engine still runs too fast after takeoff. I was looking at it in the shop and remembered a plane I saw at the contest last October. It had the fuel tank on the left side of the plane. Not behind the engine. If I have a fuel draw problem this may take care of it. I drilled some holes and mounted the tank on the other side. Maybe tomorrow I can test it. I got some new piston and sleeves for the .40's today and will measure them to see if there is a difference. Maybe I got a high performance set somehow.
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