ORIGINAL: airraptor
telemaster you cant compair the 4 stroke engine to a two stroke in HP look at where the two compair the rpm at which the HP was produced. The 4S make more torgue so it will have a higher HP at a lower rpm yet the 4S will not make the same HP at the 16-17,000 rpm like the 2S.
And propellers work more effeciently @ 10,000 RPM & less. I have found that 4-stromes will definately pull larger/heavier/bulkier airframes into the air than 2-strokes of equal HP.
And they sound so m uch better.