"Mike Beede" wrote in message
...
At least ones with constant-speed props. It seems to me that you get
much better thrust at low speed with a CS prop. My understanding,
which may be defective, is that at low speed much of the fixed-pitch
prop is stalled.

My answer was intentionally oversimplifying the issue. It is true that prop
efficiency and total thrust generated depends not only on engine power
(which itself depends on RPM, which may be limited with a fixed prop
installation), but airspeed as well.

But over the course of an entire takeoff run, assuming thrust remains
constant as a first approximation is perfectly reasonable, especially for
the purposes of the question asked.

Pete