Originally Posted by
särpet
Flight test with rossi.
Apc 9x4 16100rpm is too heavy prop,tight turns and rpm go down.
China apc 8x4 19200rpm is very good, engine not loose rpm in tight turns,but 1:12 ekw thun is too slow plane.
I don't understand about this engine, my got the same results 8x6 17500rpm, 8x4 18600 rpm. my engine running about 15 of 6oz fuel tanks. The smallest prop for this engine 8x4 according to Novarossi, my still running stock tune muffler, it didn't give enough power to what I expect it will does . I just order Jett BSE 35 side exhaust to replace this engine, for my setup I need 8x7 or 8x8 prop. Here is my HK Invictus maiden
https://www.youtube.com/watch?v=UTd4GXouPxg