twin prop question

[gator79]

I have twin Yamaha 130's on a 24 foot Grady White walk around cuddy. (heavy boat) I currently have 13x17 aluminum props and want to switch to stainless <br />steel. should I change the pitch because of the stainless prop being thinner? wot is 6000 rpm now. <br />one is counter rotating if it makes a difference.

 

[LubeDude]

Re: twin prop question

If you are turning 6,000 now, I would use the same pitch in a stainless to bring the RPMs down just a bit. <br /><br />Check Ebay, sometimes there are matched props listed.

 

[Dhadley]

Re: twin prop question

If 6000 is with a light load youre right where you need to be. Actually if you hook up with a performance center they may want to try 19's and raise the motors a tad so you'll end up at or near the same rpm but decrease slip and increase efficiency.<br /><br />You can also play around with swapping the lower units to change the prop rotation.