the transmission can give any gear ratio instantly.
So, when speed
So this determines the engine rpm also.
Since the speed and tire size is known, the rpm
of the tire is also know. Then we need to adjust the transmission so that the gear ratio will translate
the engine rpm to tire rpm.
Since this power=FO*speed is less than the peak power,
and I assume each engine can provide any power between
0 and peak power. So it seems if the transmission is
ideal (unlimited ratio selection), the power curve
does not count for speed under VO either.
Of course, when transmission is not ideal and provides only a limited number of gear ratio selection, then
the power curve counts.