Read my very long post above somewhere..There are very few "designed from the ground up to spin a specific prop at a specific rpm" engines out there..Using chainsaw parts with a different crankcase( which is what most of the so called engine manufacturers do) does not consititute a built for a specific purpose engine..
I will put one of my G260 Zenoah "CONVERSIONS" up against any "built for a specific purpose" engine of comparable size (somewhere around 30cc) for thrust..Run any prop you want on yours, mine will run an 18-6 Mejzlik...
If you can find a 3 lb(muffler, ignition system, and battery (INCLUDED) engine that make as much thrust as my underpowered(?)conversion Zenoah, bring it on..Any takers ???
Using the very same chart, (ThrustHp) my Zenoah is better..We all know the chart is wrong, but good for comparisons between props, rpm, and engines.....(and conversions)
Good for BME, designing their own cylinders..Competition is what we needed to get to this level..
Still hard to believe a 50cc engine can weighs only 2(?) lbs...
Hope they can pull it off