I suppose I could redo the test using 10x6's. Problem is I don't have an Evo or MA-3S 10x6. That would bump the rpm's up and we could see if the HP figures go up as well. Maybe I'll test APC, MA Black and Graupner 10x6's over the weekend.

The good news is that I think I'll keep this engine. I bought it used for about $18 (missing its muffler). It's stronger than I thought it would be; not a bad sport .45 at all.

One thing we don't know is what this engine will do on a plane flying a steep upline. Loading up these props may cause the APC and Graupner to drop quite a bit in rpms. The lighter props will probably maintain their rpms better when loaded in flight.

David