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Author Topic:   prop diameter
Lkart67 posted 10-02-2002 09:12 AM ET (US)   Profile for Lkart67   Send Email to Lkart67  
I have a 14x19 aluminum prop on my 19' 1973 outrage with a 175 merc. It turns 5200 at wot.I have the opportunity to by a 15x17 ss prop at a great price. Does any one have any idea what this will do to my boat? Will the decrease in pitch make up for the increase in diameter and keep the rpm the same?

Thanks, AL

Bigshot posted 10-02-2002 10:16 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Yeah but I doubt it will be better. Try it and if you like it. If not take it back. If can always resell it if a great deal. Great deal would be under $100.
VMG posted 10-02-2002 01:32 PM ET (US)     Profile for VMG  Send Email to VMG     
Assuming they're similarly cupped, I'd say you're going to gain a couple hundred rpm. Top end will be a wash, hole shot will be better, the boat will stay on plane at lower rpm, and optimum cruise rpm will expand.
Sal DiMercurio posted 10-02-2002 06:28 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
That extra inch in dia could cause you to loose 50 to 100 rpms, but the 2" drop in pitch, will allow you 400 more rpms, so maby 300 rpm gain, which would put the engine at 5,500 rpms.
What is the max recommended rpms for that engine ?
You "REALLY DON'T" need 15 inches of pitch on a montuak.
That 15 x 17 is for a 22' boat or larger, not a 17'.
Lkart67 posted 10-02-2002 08:21 PM ET (US)     Profile for Lkart67  Send Email to Lkart67     
Thanks for the input. I am hoping to pick up a couple of hundred RPM. The Mercury mechanic I bought the motor from advised me to try to keep WOT at 5400 to 5600 RPM. Sounds like I might be there. I'll find out Saturday providing the hurricane stays inland. Also, my boat is a 19' Outrage not a Montauk.

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