Situation: way underpowered 1/4 scale BUSA Fokker D.VII with a Quadra50 engine. Absolutely no vertical whatsoever. I recognize the limits of this engine, but I need some help maximizing output with the proper prop without spending a fortune experimenting. Right now this plane will barely do a wingover. any steep climb at all and it runs out of steam very qucikly. It appears this plane flies best on a 20x10 (brand unknow) pitch prop, but the rpm is way down (5400-5500) on a 20x8 wood scimitar prop the rpm climbs to 6100 but the engine doesn't seem to pull as well.

I'm wondering the comparison between a 20x10 and 20x8 prop from one four brands (Menz, Xoar, Scimitar, BME) I really like the laminated BME props because you can strip and age them beautifully.

Q1: Has anyone tested enough 20x10 props to tell if one is any better than the other in this size engine.
Q2: Can I use a 22x8 prop in this engine and gain any real pull advantage over a 20x10.

Or any other comment advice you can throw at me.

Steve