kw to hp ? no problem

You can just type
100 hp to kW
In Google. Most browser nowadays even have the google bar so no need to go to for that.
Converting thrust to power:

P = F * v

P power in Watts
F force in Newtons
v velocity in meters per second.

So a prop fighter having 4000 N of drag (say L/D 10 and 40000 N weight) at a speed of 200 m/s would need 4000 N * 200 m/s = 800,000 W = 800 kW of power. With prop inefficiency perhaps 1 MW. In obsolete units, that's about 1500 HP.

Instructions for converting stuff from other units to SI ones are above, Google does it.

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