.An industrial engine is made to work harder and last longer than any "purpose" built model airplane engine...You think a DA50 would last very long with a chain bar on it cutting down trees...? FANTASY.....A BME is a CHAINSAW INDUSTRIAL engine, converted to fly model airplanes...Any wimpy little prop you would care to put on it can NOT even compare to what it would do in the woods cutting down trees, using whatever old oil and fuel mixture happens to be in the can....It will OUTLAST any purpose built model airplane engine, PERIOD...Same goes for ANY converted engine using the original factory crank, rod, piston cylinder, and bearings....Those who think "industrial" is a bad word are very much misinformed....
Take a look at any crank and con rod from a chainsaw and compare it to any of the purpose built components.....THERE IS NO COMPARISON....A CNC machined aluminum or steel con rod with a pressed in steel shell Torrington roller bearing is no match for a steel chainsaw rod with a case hardend bearing surface with a heavy duty steel caged roller bearing....A&M found that out, where are they ? Apparently DA is finding that out too, on a smaller scale.....They're fixing theirs...