Kevin:

Yes, the HP curve ROP is quite flat across all the usable range. Only when VERY, VERY ROP does the HP curve fall off enough to be variable with FF. At that point, more fuel LOWERS HP. The reasons for this have to do with the slowing of the burn rate and the alteration of the internal cylinder's peak pressures as related to TDC. This is known as ThetaPP.

Please come by to see me. I'll bring a HP curve chart and I made a little ROP MP/RPM chart to show you 337 guys how mass air flow ONLY determines HP when ROP.

Walter