Just chiming in as another UMS-Seidel/EVO owner. I have a 7-70 in a 1/5 FW-190. Weight is 29.5lbs RTF. UMS tech collector ring I'm running 100% methanol with 1 quart of klotz super techni-plate oil per 5 gallons, so 5% oil content. Mcdaniel RC on-board glow system allows the engine to idle at 900-1100 rpm reliably. I am currently running a Menz Ultra 24-12 2 blade wood propeller, that has been cut down to 21" in diameter (which increases the pitch to around 15-16") @ 5900 RPM (mixture richened 200rpm from peak), Their is also a functional "cooling-fan" attached to the spinner just like the full-scale 190 had, that probably robs a good bit of power. Airplane has a realistic takeoff at full-throttle, and takes about 1 lap around the field before it gets "on step". Afterwards, the model has to be flown like a full-scale airplane. Verticals are limited to about 500, and Large scale loops are a bit difficult due to the lack of power.