I love the Saito upright. Must admit I've never tried it inverted.

I found the APC 15 X 6 prop works best for me. Getting about 9,600 rpm running a little rich, on 15% FS CoolPower at 1,100 ft.

I just followed the standard instructions for engine mounting...no extra washers.

Fuel tank is plenty adequate for 7-10 minutes depending on throttle settings. A lot of aerobatic stuff with this plane/this engine is surprisingly low throttle. I don't know about you, but after 7-10 minutes of practicing stuff I'm not good at, I'm ready for a break.

mt