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Old 05-21-2007, 09:54 PM   #1
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Default prop size for my boat?

can you tell me the best size prop for my boat?.

i think im under prop .(is that what you call it) it revs to much and not that fast.

i just put in a 5.7 350engine new not run yet. so i will like to do this job the same time
and stop the over rev.i cant tell the size is on it now.drive is alpha one gen 2.
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Old 05-22-2007, 12:02 AM   #2
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what size boat.....I ran on my 24 a 15x19x 4 bladed prop....it was ok...but when i went to the 15x19x3bladed big eared prop..the boat really ran great..so...depends on the boat and weight .....

you can find the size of the prop on the side of the hub between the blades.......
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Old 05-22-2007, 12:22 AM   #3
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i think its about 2000lbs 2300sc
23 or 24 foot?
plane @3500rpm then the revs just go mad with no speed.30mph on the clock.got the trim tabs on play with then same.

i was thinking with the engine that size it will get up to 50 ish?
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Old 05-22-2007, 12:39 AM   #4
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you can see my boat in the pic gallery :wink:
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Old 05-22-2007, 03:18 AM   #5
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gezy.....I think your probably having a slippage in the hub.......might wanna take it off and take it to a prop shop........check the blades too...if they are bent...you'll get a vibration and possibly cavitation......

at worst it's the hub......
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Old 05-22-2007, 01:24 PM   #6
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Default props and pictures

I would like to comment and share my experiences, but I cannot see the picture you refer to , when I click on Member gallery, it comes up empty. I have never posted pictures in the forum, but I do have a web page where you can look at the set up on my 2100SC


http://sempreveloce.tripod.com/

There's a good shot of the tabs and the Stainless prop that I went with. I have a 5.0 liter and with this prop RPM tops out at 4100 and if I carefully manage the tabs and the drive angle, I can get to 50-51mph.

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Old 05-22-2007, 03:49 PM   #7
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I have a 2100 sr2, 5.7, with a Quicksilver 19 pitch s.s. 3 blade. I hit 55 saturday at about 4500 or so rpms, and I get on plane quick. I am not sure of the diameter, tip to tip it measures out at about 13 7/16, but there is no markings showing diameter, so I am guessing it is around 14". This prop was on it when I bought the boat, and I dont think I will be changing it anytime soon.
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Old 05-22-2007, 04:03 PM   #8
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Default SR versus SC

You're probably 800 lbs lighter with the Sport Runabout over the Sport Cuddy, and with a 5.7 versus a 5 liter, I would expect that performance. I'll bet the markings for the prop are there, maybe inside the hub. Manufacturers are sneaky as to where they stamp the numbers.

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Old 05-23-2007, 06:21 PM   #9
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4878120a4019p ?.thats what i see on it.so how big can i go.will buy one then :wink:
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Old 05-23-2007, 06:46 PM   #10
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it looks like your at a 19"p...so you could easily go to a 21-22" pitch if your hitting the rev limiter or going way past the 4200-4800rpm rev range the manufacturer wants the boat to run at....

what's your WOT rpm range??...Wide open throttle??..cuz that is going to dictate what prop size to use....

I still think your slipping the hub....
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