RE: Fuels
Hi!
We use 17% all synthetic oil in our Q-500 428 class as the rules says so over here[8D]. I think it's just because thats the fuel that most of all resembles the fuel used in 428 pylon in the USA.
80/20 fuel is used in our "newcomer" class Q-500 since day one, at least since we started flying Q-500 in the early nineteens.
We use standard .40 engines like Webra GT .40, TT .40 SE PRO and OS FX.40 and use 10x6 plastic props.