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Very simple Prop Question

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Old 03-22-2002, 11:27 AM
  #11
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BTW, there's no such thing as a simple prop question.
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Old 03-22-2002, 11:31 AM
  #12
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What engine and how many Rpm,s are you turning?
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Old 03-22-2002, 11:42 AM
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Quote:
Originally posted by Eric1969
I thought the response I would get would be something like, yes keep same pitch, just change to SS.

Crap, now I have to try different props. I will call around for some suggestions, I guess.

Just when you thought you would get a simple answer!!!
That's what you get for thinking again

Take Baja Daze advise.

Typical rule of thumb when going from 3 to 4 blades is to drop down one inch in pitch. The same holds true from aluminum to stainless(down one inch) due to the less flex--Your aluminum will actually flex and flatten out slightly giving you less effective pitch. Hope this help.
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Old 03-22-2002, 11:44 AM
  #14
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I could very well have the smallest boat on this forum!!!!!!!!!

It is a 170 Horizon FW with a 4.3L 190 HP. It is an excellent starter boat and am thrilled I picked this boat. Not having very much boat knowledge, I went for minimal investment for the first one.

My goal in 2-3 years is a 212 Baja Islander with the 496!

I usually turn about 4800 RPMs when in the boat by myself.

My goal for changing props is to get better performance for minimal $$$. I am going to change boats in a few years and don't want to invest alot of $$$ in current boat. In addition, I figure the SS Prop will help with resale.
 
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Old 03-22-2002, 11:46 AM
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when you increase the efficiency of a fluid coupler like a torque converter or a prop....the other componets will suffer more,,,put simply....add a set of drags slicks a stock mustang and see how long your drive line componets last!!!...report the facts....call a prop expert!

Joseph Allen Skrocki
Engineering - Phase III Dynamometer Lab
ATNPC Box 38, 35500 Plymouth Rd., Livonia, MI 48150
Phone: (734) 52-35339 Text Pager734) 651-2028
Email: [email protected]/
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Old 03-22-2002, 11:50 AM
  #16
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I had a 19ft Rinker with the v6 motor. I used to to ski alot. I went from a 21 aluminum to a 19 ss and gained both low and kept the same top end.
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Old 03-22-2002, 11:53 AM
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audacity,
i will give him a call and pick his brain.
 
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Old 03-22-2002, 11:55 AM
  #18
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One little thing to keep in mind about a SS prop. It's true that SS is much stiffer than aluminum, resulting in both less flex and less drag - the SS blades can be thinner than the aluminum blades.

This can be a double edged sword, however, depending on where you boat. If you hit a deadhead or rock with an aluminum prop, you'll likely bust a blade. Hit the same object with a stainless prop and the shock is more likely to be transmitted up into the outdrive. Busted outdrive shafts and gears = big $$; bend blade on a aluminum prop = small $$.

So, if you're on a lake with lots of stuff hidden, you might be better off keeping the aluminum prop. Something to think about, anyhow...
 
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Old 03-22-2002, 12:26 PM
  #19
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What is your maximum RPM now? If it's too low, then the 19 SS prop will be the way to go, but if it's too high, a 21 SS prop will help lower the RPM. I'm guessing but the recommended RPM range for the V-6 is 4600-5000?
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Old 03-22-2002, 12:31 PM
  #20
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I get about 4800 RPM, Tomcat with the 3 blade 23 pitch.
 
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