Boat speed

[wrightjd95]

Hello all!

I'm just wondering? How fast do ya'll boats go?

Also how fast do you reckon a 17ft Maxum will go with 200hp? 1700mf 1996

[jrsick]

what size prop and what is your gear ratio?
My 2100 with 5.0 would get close to 50. But I don't really know because I'd lose my nerve around 44 mph.

[Phillbo]

I've never looked.... I have a cruiser so I'm not about speed.

[Patrick Bodkin]

My 2900 SE hit 44 MPH on WOT during Marine Survey phase, but I never take it much above 30 MPH at all. I usually just try to get up on plane around 25 - 27 MPH and leave it at that. The 2nd in Command would prefer about 8.0 MPH, but that is a whole different story.

[wrightjd95]

Originally Posted by jrsick

what size prop and what is your gear ratio?
My 2100 with 5.0 would get close to 50. But I don't really know because I'd lose my nerve around 44 mph.

I would need to check. But let's say an optimum prop for speed. The 5.0 makes 260 hp, right? Although it is a larger boat 17ft vs 21ft, so I imagine that would make a huge difference.

Originally Posted by Patrick Bodkin

My 2900 SE hit 44 MPH on WOT during Marine Survey phase, but I never take it much above 30 MPH at all. I usually just try to get up on plane around 25 - 27 MPH and leave it at that. The 2nd in Command would prefer about 8.0 MPH, but that is a whole different story.

Haha get a trolling motor for the "admiral"!

[mmwjr]

Originally Posted by RobertHan

This formula is the simplest formula to calculate boat speed. √(shaft horsepower /weight)x boat constant = boat speed
A heavier boat displaces more water, but the deeper water line also makes it more difficult for the boat to clear the waves of water along its hull, which is important to gaining faster boat speed.

Shaft horsepower is not something I/O manufactures typically provide. Additionally "boat constant" is unknow to the general public.

[shrew]

Originally Posted by wrightjd95

I'm just wondering? How fast do ya'll boats go?

I have one boat that does roughly 8-10 MPH. I have another boat that will top out at roughly 30 mph.