Freestyle 148 to 155 pump change- prop sizing

[Brian_216]

Anybody have a guide or formula to use when going from 148 to 155 pump? Supposing the 148 is pretty well set up to the boat, how to tell what prop will work in the 155 without going at it blind and trying 10 different props? Other than those with real world experience there has to be a better way

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[raytherace]

what is the setup ?

 

[Philip Clemmons]

I'm sure there are some tuners out there that would know

 

[Brian_216]

Phil, im juet trying to save you some work....um, by the way- did Erik tell you you are tuning my boat for daytona?

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[Philip Clemmons]

Nope........hadn't heard a word about it but sounds good to me.

And BTW, it's not a lot of work for someone to give you a prop number lol.

 

[Brian_216]

Really there should be a databsde or scientifical mathematical x+y/%=x÷5% blah blah math stuff that says if a 12/18 in a 144 pump the equivalent in a 155 is ___/____. There are some VERY smart people on here, just surprised it hasnt been done yet.

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[kevbo]

Really there should be a databsde or scientifical mathematical x+y/%=x÷5% blah blah math stuff that says if a 12/18 in a 144 pump the equivalent in a 155 is ___/____. There are some VERY smart people on here, just surprised it hasnt been done yet.

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A 155 will be noticeably flatter for the same load compared to a 144. A 144 with 18 degree trailing edge is about the same as 15-16 degree trailing edge on 155 depending on nozzle selection.

 

[sjetrider]

Good luck bro, it seems to be most vendor builders most kept secret. Thrust will not tell you what they run unless you buy a motor from them, PHP would not devulge their setup either.
Xscream will tell you no prop will work without their setup LOL
We can run tell you what worked in our 155 pumps with 1200cc dasa or 900cc dasa if that helps.
I can tell you the difference on the 148 to 155 on the 1200cc but not the 900cc. I beleive in share and share alike.

 

[Brian_216]

Looks like Im selling the 148 and hopping on this 155 bandwagon.

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[swannysxr]

Give Glen at Skat a call.