PROs and CONs of Engine Choices

[nyrikki]

Greg, I hear what you are saying but you stated:

So at what rpm and HP is that 75% at - on an x340?

Per your own equation: which equals 7.13 GPH, so I can only conclude that to be at 5.5 GPH on a x340, the HP must be somewhere less than 100 which would certainly be less than 75%.

Further the Cubcrafters data states "at optimal conditions" but nowhere states what those are or any percntage power associated. But knowing 320's and 360's (340 being in between) 5.5 GPH would likely be at 50 to 55% at best.

Not arguing if 5.5 gph can be achieved, but not anywhere near 75% as stated, no matter how you slice it! IMHO

Greg

75% of the rated continuous horsepower, which is about 80HP to meet S-LSA rules. Same standard as the rotax is held to.

5.5 GPH is conservative using the same standards as are afforded to rotax.

Edited to add: The x320 will use a longer two blade and prop efficiency complicates the math too much to share in this format.