need prop advice

[webcraf22]

I have 22ft webbcraft ski, with a 260 mercruiser. i like to pull tubs and skiers, the prop that is on it is a stainless 15 1/4 x 15, it has a great hole shot but no topspeed. i want more speed. have asked alot of questions and have determined i need a 20 to 23p for my rpm range, what would be the best prop to go with, and how much of a difference would the diameter make at that pitch?

 

[smokeonthewater]

Re: need prop advice

i've asked a similar question just below yours.... you sure about the pitch you selected?.... for tubing and skiing I'd think 17-19 max and 21 for speed when not towing... what speed do you get with the current prop and what do your rpms do? I assume you have to back off to prevent over reving?
have you tried mercury's prop selector?

 

[Bondo]

Re: need prop advice

Ayuh,... Welcome Aboard,.... Please,.. "Read This First"....

 

[webcraf22]

Re: need prop advice

i've asked a similar question just below yours.... you sure about the pitch you selected?.... for tubing and skiing I'd think 17-19 max and 21 for speed when not towing... what speed do you get with the current prop and what do your rpms do? I assume you have to back off to prevent over reving?
have you tried mercury's prop selector?

i do have to back off of it at top speed, its around 38mph at 4400 rpms in good conditions, i ve topped it out at 44 at 5800 but i dont like that, id like to stay around the 4500 range, and all the scales and guides ive looked at say 20 to 21 at that rpm range.

 

[steelespike]

Re: need prop advice

If you expect to tow well I don't think you want a 23" pitch.
You may have to comprimise unless you want to change props for towing.
A 4 blade may help your hole shot some and may help keep the rpm down a little.
The pitch change should help your speed but adding blades will blunt that some.
As suggested 17-19 for towing and 21 for speed.Keep in mind any prop change
is a educated gamble.And if you change brands and or material you add even more variables.

 

[webcraf22]

Re: need prop advice

so i think i will go with a 19 or a 20 so i can still tow, but should i change the diameter or anything like that? also whats the difference between a cleaver prop and a regular prop?

 

[junior1113]

Re: need prop advice

old prop pitch multiplied by old rpm divided by new prop pitch(subtract 100 for 4 blade application)
15X5800/23=3800new rpm -which would take a week to get on plane
20=4350-bolder line lugging
19=4600-good
4x18=4700- this would be all around best prop
17=5100-ok to pull or carry heavy loads
this is a rough math answer. same style prop
id look for a 4 blade 18pitch if it were mine. 4 blades jump on plane, can be on plane at lower speeds. at mid range more fuel efficient. pull any thing.

 

[smokeonthewater]

Re: need prop advice

click on the link I posted earlier..... that will tell you what you want to know.... from my research you want a 14-14.5" prop

 

[hwsiii]

Re: need prop advice

Junior, is right you are looking for a 19" pitch prop with the information you provided.


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