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Author Topic:   Props

Whalerdan posted 02-16-2001 10:05 AM ET (US)
I know there are a lot of discussions here about prop pitches and to me it's kind of confusing.
I have a couple of questions. I have and 85 Montauk with a 115 Evinrude. I currently run a 12 ž by 21 prop aluminum prop. The boat runs like a scalded cat with a top speed of about 48+ mph and it pulls a fat (220lb) wakeboarder out of the water just fine.
I'd like to get a SS prop but I want to keep this same type of performance or better. What dia. and pitch should I be looking for? Also would running a SS prop possibly subject the lower unit to more abuse if it hit something? Around here (Charleston, SC) with the tide changes we hit the bottom pretty good (actually bad) sometimes.
Thanks for any help. Hope Clark answers, he really seems to know his stuff on this topic.

SWarren posted 02-16-2001 10:12 AM ET (US)
WhalerDan,
What part of chas do you live in? I live in Mt Pleas. The ss prop would be better in my opinion for oysters and other stuff. Skips propeller on cross county rd can re cup and do all kinds of things to props for you.
Clark Roberts posted 02-16-2001 11:19 AM ET (US)
Whalerdan, seems like you have a pretty good good set-up with the al prop. and Iwould suggest that you try a 21" pitch OMC SST prop! Try to get a pitch that will let the engine rev to about 5600 rpm... no higher than that! You may find that a 23" pitch is what you need... just guessing, testing with a tach is the only way to know for sure! The stainless prop will not impart more shock to drive system than the al prop as both are shock mounted to prop shaft via a rubber bushing... however, shifting gears may cause a "clunk" due to the increased mass of the stainless prop... not to worry, just keep engine idling as low as practical! And you will not sustain any prop damage when you hit that oyster bar!! Happy Whalin'... Clark

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Author	Topic: Props
Whalerdan	posted 02-16-2001 10:05 AM ET (US) I know there are a lot of discussions here about prop pitches and to me it's kind of confusing. I have a couple of questions. I have and 85 Montauk with a 115 Evinrude. I currently run a 12 ž by 21 prop aluminum prop. The boat runs like a scalded cat with a top speed of about 48+ mph and it pulls a fat (220lb) wakeboarder out of the water just fine. I'd like to get a SS prop but I want to keep this same type of performance or better. What dia. and pitch should I be looking for? Also would running a SS prop possibly subject the lower unit to more abuse if it hit something? Around here (Charleston, SC) with the tide changes we hit the bottom pretty good (actually bad) sometimes. Thanks for any help. Hope Clark answers, he really seems to know his stuff on this topic.
SWarren	posted 02-16-2001 10:12 AM ET (US) WhalerDan, What part of chas do you live in? I live in Mt Pleas. The ss prop would be better in my opinion for oysters and other stuff. Skips propeller on cross county rd can re cup and do all kinds of things to props for you.
Clark Roberts	posted 02-16-2001 11:19 AM ET (US) Whalerdan, seems like you have a pretty good good set-up with the al prop. and Iwould suggest that you try a 21" pitch OMC SST prop! Try to get a pitch that will let the engine rev to about 5600 rpm... no higher than that! You may find that a 23" pitch is what you need... just guessing, testing with a tach is the only way to know for sure! The stainless prop will not impart more shock to drive system than the al prop as both are shock mounted to prop shaft via a rubber bushing... however, shifting gears may cause a "clunk" due to the increased mass of the stainless prop... not to worry, just keep engine idling as low as practical! And you will not sustain any prop damage when you hit that oyster bar!! Happy Whalin'... Clark