Prop Size for Outboard

[Severdsoul]

Hi, I have a 74 50hp Evenrude Outboard on a shallow Fiberglass V bottom boat. The enging sound great. The only problem is the people that had it before put a oversized prop on it. It has a 13.5x15 prop, Because of the prop being to big the boat wont plane at all even with someone sitting on the bow. <br /> My question is any one know what size and pitch prop should be on a motor that size? I dont have a tach on it, so i realy have no idea of where its running at full speed right now, (but from the sounds i can tell you way to low from the one time i took it out so far) <br /> The motor is rated at 50hp at 5500 rpm<br />I've checked around at the boat shops, and they would be glad to help, but at a price naturaly *lol* I figured i would see what i could learn before i did anything.<br /> Thanks in advance for any input.<br /> Kurt

 

[JB]

Re: Prop Size for Outboard

Howdy Severdsoul.<br /><br />"Shallow fiberglass V bottom" is not enough information about your boat for us to be of any help.<br /><br />I think your problem is more likely to be low engine power than prop, unless your boat is a real heavy barge. A 15" pitch is very common on 50HP engines.<br /><br />Do a search for power loss and verify that your engine is making full power. Bring a cup of coffee.<br /><br />Let us know what you find.<br /><br />Good luck