Jack Plate and Prop Advice

[Berto]

Hi.

I'm running a 115V4 Yamaha on a 17ft Raven without a jackplate and with a 17' prop.
I'm currently getting 75kpm on flat taps and it handles fine there.
Is it worth playing aroung with props, jackplates etc. to get a bit more speed out the rig and how should this effect my consumption?

Has anyone maybe tried the same type of rig and what is the avarage speed one should expect from a 115?

Tx

B

[Toadee]

You'll go through a lot of effort and probably win less than 4kph.

A jack plate will give slightly better performance as will optimizing your motor height but 75 out of a 115 is not bad.

[Berto]

And trying a bigger prop? What can one do there?

[Riprap]

Berto - Step 1: What revs are you achieving at WOT (wide open throttle) and compare with the max revs for the motor as indicated on the plate on the motor itself.

[Berto]

Berto - Step 1: What revs are you achieving at WOT (wide open throttle) and compare with the max revs for the motor as indicated on the plate on the motor itself.

The net says it should rev 5500 and I get 5400-5450 on WOT? depending on the dam I'm on? Don't know why? :blue-question:

But I'll go check on the motor tonight...

[Berto]

So I've checked and I get the full revs at WOT. Does this mean I can try and upgrade the prop?

[Riprap]

Berto, no, if you go up in pitch you will lose hole shot and revs. If you go down you might over rev. Leave it as is.
Adjustments still available are no of blades and height of motor. There is nothing wrong with that speed for a 115 on a 17' boat.

[Berto]

Thanx Riprap