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Posting a reply to: Need help with propeller - stainless really better

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[QUOTE] - 7/7/2002  12:14 AM

Diver, 
      I'm not an expert by any means but I'll help you with the basics.  The numbers stamped into the barrel of your existing prop identify the diameter and pitch.  11 1/2 X 19 would signify an 11.5" diameter with a 19 pitch.  Pitch has been explained to me as the theoretical distance your boat moves forward for every revolution of the propeller.  So in theory for every rev, you are moving forward 19".  This sounds a little high pitch wise, for a 55hp, but anything is possible.  I own a mid 90's 50hp merc and run a 13 pitch.  If you go to buy a new prop, the easiest thing to do is remove the old one and take it with you.  As far as pro's and con's of stainless,  I bouhgt and use a michigan wheel cupped stainless prop on my fifty, overkill, yes probably, but I like how it looks, and I needed an extra prop.  Another advantage I have experienced personally, is when crossing a just a little bit too shallow sand or gravel reef, the stainless prop just burred on the edge a little.  My partner in crime was running a standard aluminum and it took a quarter sized chunk out.  As far as high speed hits, many things have been said on this board, but your toast either way.  Good luck![/QUOTE]

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Posted 7/7/2002 12:14 AM (#37509)
Subject: Need help with propeller - stainless really better

Diver,
I'm not an expert by any means but I'll help you with the basics. The numbers stamped into the barrel of your existing prop identify the diameter and pitch. 11 1/2 X 19 would signify an 11.5" diameter with a 19 pitch. Pitch has been explained to me as the theoretical distance your boat moves forward for every revolution of the propeller. So in theory for every rev, you are moving forward 19". This sounds a little high pitch wise, for a 55hp, but anything is possible. I own a mid 90's 50hp merc and run a 13 pitch. If you go to buy a new prop, the easiest thing to do is remove the old one and take it with you. As far as pro's and con's of stainless, I bouhgt and use a michigan wheel cupped stainless prop on my fifty, overkill, yes probably, but I like how it looks, and I needed an extra prop. Another advantage I have experienced personally, is when crossing a just a little bit too shallow sand or gravel reef, the stainless prop just burred on the edge a little. My partner in crime was running a standard aluminum and it took a quarter sized chunk out. As far as high speed hits, many things have been said on this board, but your toast either way. Good luck!