ORIGINAL: CloudSkipper
Ok nice. Some engines have surprisely less hp than others of same displacement and I've gotten the overall impression that the Evo trainer engine is like this, but I guess not.
No, it actually does quite well and is comparable to the higher HP .46's in performance.
It's almost impossible to tell the difference in the H9 P-51 PTS trainer ( WITHOUT the training aids ) when using an 11x6 prop and the Evolution PTS engine, as compared to the AX .46 with the same prop, on the same plane.
The PTS has a .455 CU displacement versus the .46 CU of the .46 AX... not much of a difference.
The purposely designed highly oblique prop accounts for people thinking that the engine doesn't put out a lot of power.