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Name:
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MotorMan
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Subject:
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Buying a new prop - Need Help
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Date:
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5/31/2005 1:08:29 PM
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Hi again,
I think I put the statement I made about the 23" prop being a high rev prop backwards. I was looking at the 17" part. Now a 17" pitch prop would be a very high rpm prop: for a race engine only. If you are concidering a new prop, do what Oms said: go to a prop shop. My 23" prop bogged down my 19' Carlson boat with 175 Merc. It would go no more than the 19" did which was 60mph with low gas, little wife driving and a tail wind.(not kidding) With a full tank of gas, 4 people, cooler, ice, adult bevs (what the hey, beer), into a 15 knot breeze, and a bottom that had been in the water for 10 days, it would only go 53mph. I am going to guess that if you want to hit 5600-6000 rpm, and go a little faster, the prop will be 20 1/2" pitch by your same diameter. The shop may just do a little "cupping" and maybe a cut to make it more of a "chopper blade".
I believe that there is no "Horsepower Fairy". Your seller may have embelished to you about hitting 62 mph. If the boat did it, it had his kid on throttle like my wife, low on everything.
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