RE: THE ASP.12 THREAD
Joe, those are all good questions and they deserve to be looked at.
The liner shim is .002" thick. Another liner shim could be tried...but 24,000 on the ground is getting up there. I might not look too hard for more performance until this engine has been clocked "as is" in a little racer.
Thrust HP says 90 mph and 2.2 pounds of static thrust at 24,000 with a 6x4.
The head looks like it has a shim already, but I need to peck at it some more to see if it's a mirage or not.
The stock carb has a .220" hole, this venturi is .226"...which is about the same size as the hole going through the crank.
The engine, NVA, prop and "fuel tank" weigh 5 ozs as a unit. You could run this with a hard tank and crankcase pressure, but the tank adds 2 ozs, which could be 10% of the intended models' weight.
I think a little delta would be fun to build for it, or look into adapting a 1/2A model that's already laying around here to carry this engine.