tilt and boat speed

[lhutrack165]

So I currently have a boat with manual trim/tilt, so it has preset holes to choose when adjusting motor tilt. If the motor is not tilted correctly ie too far in or out, how much (without getting into the technical details too much) will it affect the top end speed of my boat? I know that the tilt will affect how long it takes to plane etc but not how It directly relates to speed. It's a 1989 maxum 1700 xr with an 85 hp force outboard, I'm expecting to get around 40 mph but only getting about 30. Any input would be great!Thanks!

 

[nate1220]

Re: tilt and boat speed

You will need to experiment and see what works best. You need to find the props optimum angle of attack.

 

[lhutrack165]

Re: tilt and boat speed

Experimenting will def be the best way to figure it out, just didn't know if anybody had an idea about how much of a difference it will make on top end speed

 

[Philster]

Re: tilt and boat speed

As low as 2% to 33% or more.

 

[Georgesalmon]

Re: tilt and boat speed

trimming the motor out will lift the bow allowing less wetted surface, less drag, higher rpm, more speed. To much trim might cause ventilation or porposing. As everyone said, you need to try different holes with different loads for you own optimal performance.

 

[Texasmark]

Re: tilt and boat speed

40 might be a little on the high side. A lot depends upon the boat shape, the weights involved, the way your engine is propped and all. As far as tilt, I have power trim and I can move the engine around with it and easily change my rpm's by 1000 and my speed by 10 mph without touching anything but the trim button.

Problem with no PTT is that you really can't get what you want. BTDT You either have it too far out for the hole shot or too far in to realize the full WOT potential. Just have to do as others said and find a mediocre spot that satisfies your ability to get up and live with the loss of top end.

Mark