actually **W = N*m/s**, so there is no conversion

Well... P=F*v

We have F from the original planes and we have v(speed from .dat)

So you could (at least according to math)

*do* the conversion - if you just take the max speed of the vehicle (converted from km/h to m/s). Then you'd have

*some* mathematically (but maybe not physically?) correct value.

Taking max speed for that equation would also kinda take care of the effect, that jet engines are least "effective" when v=0 and becoming more "efficient" with increasig speed, IIRC. So assuming that max power is reached with max speed might be easiest.

Just did that with approximate numbers for a B777 and came to ~105000kW - quite a lot.

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About the formula - I don't see a problem, you'd just have to re-arrange the formula, don't you?

so for v-max with a given weight it should be something like:

sqrt[(2500*power*gear) / maxweight] = max-speed