vintage chromoly

iTrader: (3)

Hey guys.
Any idea on what acceptable prop slip should be on a 24-7 hull with a bravo1 26p prop with a 17.5x?

getrdunn

iTrader: (7)

13.5? You check bams calculator?

vintage chromoly

iTrader: (3)

Haven't run the boat, so I've got no MPH or RPM.

getrdunn

iTrader: (7)

Ah. I'm maybe on the high side? I've got a 24' Python but haven't run it yet otherwise I'd give you some numbers as a reference. Not the most efficient hull but is a good one. Sounds like you might have your hands full depending on what you plan to turn the 26p which in my opinion is a riot. Lol.

vintage chromoly

iTrader: (3)

I've got a 1.65 to 1 drive.

getrdunn

iTrader: (7)

Rather than a nos button attached to your throttle it might not be a bad idea to have one of those things old people press for emergencies. **** bud that thing is gonna scoot. Be careful...was just kicking some comparisons around from my 24' challenger days.

vintage chromoly

iTrader: (3)

I plugged some numbers in a prop calculator and with 10% slip, turning 6k, it shows 81MPH.

I just don't know how much slip I should see. I'm assuming 10% would be a really good number, but I really don't know.

getrdunn

iTrader: (7)

10 is a really good number. My 89 challenger was very close to 11%. Boat would run 81 with 496/535hp in it. That boat had a pretty slippery bottom for its time.

What kind of power you running?

vintage chromoly

iTrader: (3)

650ish 512 BBC:

getrdunn

iTrader: (7)

Did you change the x dim? Sounds like you have it right on. Why the 1.65 ratio drive with that? Also What kind of max rpm's did you plan on running. Something doesn't make since at all. I just didn't think you'd be turning much over 6,000.???