There are a bunch of things that could contribute to this. First off, your hull
and prop need to be clear of any marine
life. In addition, you need to make sure that the prop gets good water
flow, I would doubt that the factory would ship one this way but the hull
could have been modified blocking the waterflow. You don't mention the displacement
of your boat but if something has been done to make it significantly heavier, that will have this effect. Without knowing exactly what model engine
it is, it is hard to say but 2200rpm max sounds low. The two reasons for this are improper gearing/prop and an actual problem with the engine
where it isn't reaching full power. Does the engine rev up in neutral to redline?
The engine powerband, gearbox
ratio and prop need to be matched to the boat. It is possible that your prop is incorrect. If the prop is too small, it will not get very good grip in the water
, someone who is used to seeing this will be able to spot it. If you can go from a stop and redline the engine instantly and then the boat slowly catches up, this is a good possibility. I highly doubt that the prop is too big, it would need to be enormous. You could also have too much pitch
which has the effect of putting too much load on the engine which also explains the low maximum rpm
. Too little pitch would result in reaching redline rpm
but not going very fast.
When you say that you have no stopping ability, is this giving the engine full throttle and what is the rpm? It is actually possible that the prop is overpitched/too large and the load prevents your engine rpm from getting up into the engine's powerband.
If you can find another Crosby just like yours and you can ask the owner what their engine, gearbox
, prop combo is, that would be very helpful. Also, prop shops specialize in figuring out this sort of thing and they are really the ones to consult.