Prop Size - top speed / quick

[11craigt]

Have an opportunity to buy a new stainless steel prop for $100...someone offered me. Wasn't really looking, but seems like a deal. Anyone know the proper size for an 83' Evinrude 115? My looks fine now...a few knicks and a slight dent on one fo the propeller wings - not stainless though...worth the while? Don't really need too much speed, right now I think I am about 40mph WOT @ 4500rpm on an 83' Cobia 18' center console? Does that seem right? Thanks in advance.

 

[walleyehed]

Re: Prop Size - top speed / quick

4500RPM at WOT is 1000RPM short of where you should be.<br />Need to know the pitch of the prop you have now...by what your tach says, we need to drop 5" in pitch to get the RPM where it should be, technically, but that's not how we'll do it.<br />Need to know how the engine is mounted and what prop you have now.

 

[11craigt]

Re: Prop Size - top speed / quick

I may have been off a little, as my buddy who is part owner of this yacht says we were at 5,000 rpm WOT. <br /><br />I measured the length of the outer-part of the prop blades and I come up with 9" from base of blade to its furthest point at which it starts going back to the base.<br /><br />I don't know how to tell the pitch? I took some pictures to show how the engine is mounted...keep an eye open for them on a future post here soon.<br /><br />Thanks again walleyehed.

 

[JB]

Re: Prop Size - top speed / quick

Prop topic.