Hi, Captain Jim.
I appreciate your insights.
My first consideration with the engine was indeed the fuel. It's been a long time since I've run gassers, as that was back in the day when I had several Quardas - 42 and 50. Then the fuel did not contain any alcohol. Presently, as a result of government fidling (they call it prudent legislation, but that's another topic), by their mandate, we have regular, with up to 10% alcohol, mid range with up to 5% alcohol and high octane with no alcohol. So since the start, I've been using the hight test, with no alcohol and followed the engine instruction manual by using a 25:1 gas
il mix with a non-synthetic 2 stroke oil, intended to be used in air cooled engines - not outboards since that is different oil.
I would also comment that my weed whacker really likes my old glow fuel. When I mix about a 5% nitro into the gas, it really spools up and can take on anything up to about a tree sized trunk!! Now there's an idea for the Zenoah.
As for the GA, I was looking forward to installing my smoke oil tank and pump. However, I shelved that when I came out at 21.5 lbs and could hardly get off the ground. The best description is to say that it has a very heavy, ungainly feel to it. By contrast, my Sig CAP 231EX, with an OS 1.60FX being broken in, at about 12 lbs seemed light as a feather and flew aerobatics at about 1/4 to 1/3 throttle at most with the greatest of ease. Prop was a Master Airscrew 16-10 3 blade. Fuel was 5% nitro.
I'll do some tests this weekend with several props and open exhaust. I'll tweak the carb and go from there. Oh, one other thing. The engine starts great, especailly when cold. Two - three flips to prime, one with choke and one to start. Every time.
All help and suggestions are greatly appreciated since I am not familiar with Zenoah engines and there is nobody else in my immediate area running them.