Although the most expensive one, I'm thinking for weight, sound, and in order to stay within vintage guidelines specifying up to 1.20 four stroke, I'm really leaning towards the Saito.

I'll use smaller tanks, up to half the size required, so I can maybe get two tanks inside, one for gas, the other for smoke. Four or five minute flights are fine for me. Anyone know of a double bladder tank that can hold both gas and smoke oil and is about 12-16 oz total?

Anyone have experience with this engine, and is it reliable? I knew of one other person who had a Saito gas engine and it seemed they had problems. Also, is a canister muffler available for the Saito FG21?