Prop Question

[5150]

I have an '82 Evnrude 50 horse,I am currently running a 12 1/4x15 prop that runs @4800-5000rpm WOT,what will switching to a 13 3/4x15 prop do for me?<br />I found one uber cheap so if it won't hurt anything I may go with it unless it will kill my top end completly.<br />I am pushing a 16' Sea Nymph aluminum v-bottom boat,loaded(i.e. heavy) and it runs @ 30 now.<br />Thanks in advance

 

[roscoe]

Re: Prop Question

ITs gonna drop your rpm's a little, which by the way, are a bit low already. You will probably lose a couple mph.<br /><br />You should really be looking for a 12 or 13 pitch prop, which will give you a better holeshot, and allow your engine to run at the recommended 5500 rpm.<br /><br />Any possible loss of top end will be made up for, by the increased rpm. You might even gain a mph or two.

 

[ob]

Re: Prop Question

If your 50hp has the small gearcase,which I'm confident it does,the 13 3/4" diam. prop is too wide and will decrease engine performance.Stay with the recommended diameters and pitch it to attain the recommended wot rpm that Roscoe mentioned.