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  Changing from Stainless to Aluminum

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Author Topic:   Changing from Stainless to Aluminum
Jiles posted 02-26-2003 07:08 PM ET (US)   Profile for Jiles  
I have a stainless prop on my 13 with Johnson 40. I have a chance to buy an aluminum prop of the same pitch and diameter. Will I be able to tell a difference in performance and if so, what will the difference be in reference to additional or less maximum r.p.m.'s ? I read somewhere that you should go up or down on pitch when going from one to the other for them to perform the same.
JBCornwell posted 02-26-2003 07:11 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Hi, Jiles.

Typically, the aluminum prop has thicker blades and a bit more drag. That should bring your WOT rpm down a bit, but I couldn't guess how much.

Good luck.

Red sky at night. . .

Perry posted 02-27-2003 02:20 AM ET (US)     Profile for Perry  Send Email to Perry     
Why are you changing from stainless to aluminium? Is the stainless one damaged? Most people do the opposite and change from aluminum to stainless.
Jiles posted 02-27-2003 07:42 AM ET (US)     Profile for Jiles    
It's just an extra prop that I can buy for $15. Hard to pass up a bargain, since it looks new.
Clark Roberts posted 02-27-2003 08:06 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Just buy it and try it! For a spare (get home prop) it really doesn't matter much...
dfmcintyre posted 02-27-2003 03:02 PM ET (US)     Profile for dfmcintyre  Send Email to dfmcintyre     
Jiles & Perry -

It would make a good backup prop, and after observing the internal damage caused in all probability by stainless prop hitting a rock reef, I'd recommend that when running in an area that is mostly rock opposed to sand/clay/mud, use the aluminum.


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