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New to the forums here, I have a 1989 Pirata 351 that I’m hoping to turn into a respectable surf boat. Recently damaged the stock 3 blade prop and now it shudders when weighted down with 2500 pounds and a surf shaper. Any recommendations on what prop to go with as an upgrade? Not concerned about top speed. I believe I have a 1” shaft, but am not entirely sure. Any recommendations would be greatly appreciated.
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A propeller is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral, that, when rotated, performs an action which is similar to Archimedes' screw. It transforms rotational power into linear thrust by acting upon a working fluid, such as water or air.[1] The rotational motion of the blades is converted into thrust by creating a pressure difference between the two surfaces. VidMate
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Last edited by mikestanley464; 04-29-2021 at 03:22 AM.
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Boat:
2007 Supra Launch 20SSV
Engine:
Indmar MPI-325
1.45:1 Transmission
13.5x17.5 4-blade, unknown cup
Performance:
4800 RPM WOT / 41mpg (unverified)
no ballast, wake plate at 50%, 2-3poeple + gear
Boat is used for skiing, wakeboarding, and surfer
Hole shot for skiing is pretty good, I don't give full throttle to most people
planing full loaded (1200lbs ballast plus 4 adults) is a little slow but it gets there
The top end doesn't seem much affected by the number of people, it seem like it will always do 39-41mpg
rpm/mph (wake plate 100% down)
3000/28
3500/32.5
4000/36
-> wake plate at 50% normally gives you 1-2mph at any RPM
I'm thinking about getting ACME 1591 14x16, 0.135 cup to see if I can gain a little on the bottom end without losing much on the top end or having a really high RPM when waterskiing.
Side note: Has anyone compiled this data?
A summary would be fantastic for anyone looking at getting a new prop.
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I have a 2008 20 SSV with almost the same specs. I need to replace my prop. Did you upgrade yours as you mentioned? If you did how do you like it?
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