If an engine was rated at 900 hp at the crank what would be the approx. HP at the prop with a Imco drive?

ZERO after the first time your airborne!Really,it should be 865 if you go by the way merc rates there motor packages(they usually drop the # 35 for drive). I'm sure if a bravo or imco uses 35hp then the imco 4x4 uses 5or 10 more(if thats what your asking) because of the 4th gear in the upper drive,my .02,Smitty
People say xr drives are slower than bravo's because of the straight cut gears but ive switched from one to the other and didn't see a noticeable difference