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aluminum boat manufacture
Aluminum to SS Prop. Should I use the same pitch?
I’m running a Nitro 175 Fish & Ski outfitted with the Mercury 125hp ELPTO. I have decided that I want replace the aluminum prop (12 ¾ X 21) with a SS prop. At present my RPM’s and aluminum prop are perfectly match. Max RPM rating for this engine is 5250. At WOT I’m running 5250 at 53 MPH. Being that my RPM’s and pitch are matched would I stick with a 21” SS prop? Can you recommend a decent SS prop manufacture?
Kevin M.
Because of it's shinier surface and therefore less friction you'll get a bit more slippage with the SS prop than with the aluminum one, but usually not enough to worry about. The blade design can make as much or more difference anyway.
A 21" or 22" pitch will be fine to keep the same speed range you have now if it actually suits the boat the same as your current prop does.
No two props are the same. Different designs having the same diameter and pitch give different performances with the same boat, so you'll need to specify some details about the hull, the weight, the kind of water conditions you're mostly on, the design of your current prop,etc.
A similar design of prop but in SS may be heavier and therefore load the engine more. With a thin-bladed prop it might be lighter. Steel can make thinner props than aluminum can.
There are so many factors it really isn't possible to directly transfer one set of performance figures for your boat to another prop just by book specs. You can get somewhere close but trial is the only way to get a really truthful set of figures.
Here are some links to manufacturers.
http://dansdiscountprops.com/ . . .
http://www.propline.com/ . . . . .
Happy days.
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ART CNC Aluminium Routers for Ship & Boat Builders etc
{ 2 comments }
Well, the whole incident with Josh, does shock me. Not the fact that he wouldn't get up, not the fact that you dumped his mattress over with him on it, but the fact that you used the “F” word. WOW! Don't you just love those proud parenting moments we all have. And for the record my memories of Daddy are also of crabbing and fishing. I only have one problem with this memory…there was no aluminum boat! I was never invited. I'm sure, though, it was probably Momma who said, “Eddie, there is no way you are taking my little girl out in that boat!” Enough said. Great post, Dave!
In my research, they seem to be made by Northcraft in East Yorkshire. Check them out on Google.
RIB Rigid Inflatable Boat
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