32 speed
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01-20-2008, 09:34 PM
#23
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Location: Hopkinsville, Ky
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01-21-2008, 09:15 AM
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You mentioned in your earlier post that you could run 77-78 mph (gps) at any time with your 26 pitch Hydromotive props. At 5050 rpm's if your gear ratio is 1.5 that equates to a prop slip percentage of 7.106% at 77 mph and a slip ratio of 5.899% at 78 mph. If you gear ratio is 1.35 it equates to a slip ratio of 16.395% at 77 mph and 15.309% at 78 mph. On one end the slip percentage with the 1.5 ratio is extremely good and the other end with the 1.35 ratio is more realistic. There are several ways to figure the prop efficiency slip ratio. The one we use is RPM X PITCH, DIVIDED BY GEAR RATIO, DIVIDED BY 1056, = SPEED AT 100% EFFIENCY. To calculate yours you would divide your gps speed by the 100% speed. Subract that percentage number from 100% and you have your slip percentage. For a 32' single step Fountain, 10% slip is very good. Most run at 12% or higher. I have a 1998 single step 32 Fever and mine is around 15% slip.
I have been told that some 502/415 Mag motors rev limiters are set at 5050 and some are set at 5200. I tend to believe that since my last boat hit the limiter at 5050 and my current boat hits it a 5200. Both boats have 502/415 Mag motors. It you are up against the limiter with the 26 Hydro's, you might want to go to a lab finished 28. If you go to a Bravo I prop, the 28 pitch is realy 27.333 pitch in stock form.
Sorry if I gave you more information than you wanted to know.
Good luck!
I have been told that some 502/415 Mag motors rev limiters are set at 5050 and some are set at 5200. I tend to believe that since my last boat hit the limiter at 5050 and my current boat hits it a 5200. Both boats have 502/415 Mag motors. It you are up against the limiter with the 26 Hydro's, you might want to go to a lab finished 28. If you go to a Bravo I prop, the 28 pitch is realy 27.333 pitch in stock form.
Sorry if I gave you more information than you wanted to know.
Good luck!
01-23-2008, 06:25 PM
#25
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awsome reply thanks. yea, i forgot 2 add drive ratio, sorry it is a 1.5 drive havent hit the rev. limiter yet! gps showed 80 once but i think it was a fluke/glitch, looked @ my tach looked almost like 5100 at that time
Last edited by 266ltd; 01-23-2008 at 06:30 PM.
01-24-2008, 10:00 AM
#26
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To correctly determine an approximate top speed, we would require details on the dry weight of your significant other's belongings, luggage, and "accessories" that will be loaded on to the boat.
My estimate, depending on the above answer, is 72-76, realistic speeds.
I've had my 96 502 boat for 8 years and prior to having years of "stuff" shoved in every crevice, I'd see 77-81. Now 76 is a good day with a full-ish tank.
No major issues in 8 years. Little stuff, but nothing that wouldn't happen with any other boat.
The only note is they are not a good boat if you beach a lot. They don't like to be beached, it's already at the water line already.
They're a great bang for the buck boat. Nice speeds with reliable power. You won't lead a poker run, but you'll still have the same amount of fun.
My estimate, depending on the above answer, is 72-76, realistic speeds.
I've had my 96 502 boat for 8 years and prior to having years of "stuff" shoved in every crevice, I'd see 77-81. Now 76 is a good day with a full-ish tank.
No major issues in 8 years. Little stuff, but nothing that wouldn't happen with any other boat.
The only note is they are not a good boat if you beach a lot. They don't like to be beached, it's already at the water line already.
They're a great bang for the buck boat. Nice speeds with reliable power. You won't lead a poker run, but you'll still have the same amount of fun.
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11-21-2007 10:46 AM
