RE: Thunder Tiger F-75s
Zippi: I also have 4 Saitos and several Magnum 4-strokes. Right now I have five 6 oz tanks through the 75, just under a quarter of a gallon, and it seems to be running well. I did read in another thread that it does take a gallon or so for it to reach max rpm. My Saitos were like this, too, gaining rpm as I flew them. It is fairly light, like the Saito .72, it hand starts easily and it comes with a bunch of tools. I haven't seen a problem yet. I'll know better after seaplane season gets here, around April, and I get to try it in the air.
CustomPC: Those figures look good. I would imagine that engine had more time on it than mine. 30 ounces isn't very much. I would expect mine to gain a few hundred rpm as I fly it. Looks like a 13-7 APC would keep the rpm right at 10,000, or the 13-6 and run it slightly rich.