Size of prop for my 16 ' aluminum boat

[Marauderk]

I have a 74 50 HP on the boat now and normally fish alone or with one other person. There was no prop on motor when i got it and i have a old 13-1/4 X 17 in prop that i put on just to test her out. <br /><br />I would like to know what i should look to buy for this set up<br /><br />16' aluminum fisher marine<br />74 50hp<br />has no decking or extra weight just 2 bench seats and a bow mounted trolling motor<br /><br />As i do not have a tach yet (on order) i am afraid to open her up with the prop thats on her for fear of over reving it. <br />any help at all would be a great help <br /><br />Thanks Brian

 

[Marauderk]

Re: Size of prop for my 16 ' aluminum boat

Anyone out there

 

[walleyehed]

Re: Size of prop for my 16 ' aluminum boat

When you get the tach and some RPM figures, we can then make some recommendations...

 

[Marauderk]

Re: Size of prop for my 16 ' aluminum boat

Ok got the tach but thinking it's about a 1000 rpm's off. <br /><br /><br />but WOT is at 6400 or 5400 RPM's <br />will plane out in about 2 seconds runing about 2200 rpms <br /><br />Not sure what would cause the tach to be running highr rpm's as it is set for at 5 pole but it tells me i am idling at 2000 rpms and i know thats not right lol.

 

[walleyehed]

Re: Size of prop for my 16 ' aluminum boat

It should be set for 6 pole I believe...

 

[Marauderk]

Re: Size of prop for my 16 ' aluminum boat

oK SOLVED the tach problem and running 5400 at WOT is this a good number for this set up or should i change the prop to something different as i am buying a new one to replace this old beatup old one. <br /><br />She planes fine and quickly but i think i could pick up some top end speed <br /><br />Thanks Brian

 

[walleyehed]

Re: Size of prop for my 16 ' aluminum boat

You can pick up rpm and speed by raising the engine on the transom 1 hole at a time and test...<br />Problem is...I don't know what your old beater prop is like...it could be in a fasion that would lower rpm or completely the other way around.<br />I think I would stick with the same size and work with the set-up to get a 150-200 more RPM.