On the week end I ran in a NIB (well, it was
) OS 40 FP. Prop used was a taipan composite 10x6.
I ran it on 10% Klotz syn, 10% castor, 80% methanol. Top RPM 11,500 steady. 2 1/2 turns out on main needle
I then put on a Mecoa/RJL diesel conversion head. 25% castor, 33% ether, balance kerosene with 1% EHN. Top RPM 12,000 steady. 2 1/8 turns out on main needle.
This engine runs stronger on a sports PB diesel mix, and I am sure, much more economically on fuel consumption.
I did this to prove to myself and a club sceptic that on plain fuels (ie no nitro methane in the glow mix) the engine would perform better on diesel.
Starting was so easy either way, just a few flicks.
I don't know why this is the result. Maybe someone can come up with a definitive answer.