Andy,

Thanks for all the effort you're putting into trying this, and documenting.

When I get time, I'm going to try my PAW 19 on some Castor + Kero + one of the Redline boosters. I've just bought a tachometer so I can actually see what the engine's doing.

FWIW, with my PAWs I NEVER had to resort to cylinder priming. The .19 in particular was always happy to light off from cold with just a couple of chokes, even when inverted. A very easy to use engine. It got so I could leave it with the compression & needle valve set right for my flying and rarely need to even touch it.

I notice you're still using ether in the prime. Do you think we can get to the point where we simply don't need ether even for starting?