Chinese ST G.34 C/L
I've got over an hour on one of these G34's so far. Initially, the first 15 minutes were done with 75/25 all Castor FAI fuel for the initial rin seating, the remainder on 75/25 FAI with the oil package being 75/25 Castor/Klotz.
Somewhere around the 45 minute mark things started getting pretty happy and its performance started to increase noticeably.
I'm still on the factory plug, and using the same Taipan 9x6 I broke it in with.
Performance hauling a Ringmaster on 60x.015's is outstanding. This engine appears to be the equal of, or perhaps better than a strong 36XBB or G21 .35, and that's using the 75/25 FAI fuel. At the moment, its so strong and easy handling I feel no need to feed it any nitro at all.
Getting the first pop out of it when it was brand new and the ring unseated required some cranking, but subsequent starts were dramatically better. It still feels squishy as ringed things are prone to be, but several chokes and a firm flip gets it going easily.
Bonus feature: the mounting hole pattern and lower case width are substantially identical to the Fox Stunt .35.
Downside: the supplied muffler is a very heavy brick. All but worthless on anything but a severely tail heavy plane. It does a very effective job at silencing the engine though. Minus muffler, the engine is in the same weight range as a 36X or G21 Tigre, i.e. a couple of ounces heavier than a Stunt .35