How much fasted should 75hp make it go?
05-19-2005, 04:01 PM
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How much fasted should 75hp make it go?
Here's a question for ya.
If a certain single engine boat will run 80 with a Merc 525, how much faster should it go with a Merc 600?
What's the math on this one say?
If a certain single engine boat will run 80 with a Merc 525, how much faster should it go with a Merc 600?
What's the math on this one say?
Re: How much fasted should 75hp make it go?
05-19-2005, 04:28 PM
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Re: How much fasted should 75hp make it go?
Ron
You know better than that, lots of variables.
If we are just guessing for fun I would say 84-86. 80mph is pretty fast already and its going to take some pretty big jumps in HP to push the hull faster.
You know better than that, lots of variables.
If we are just guessing for fun I would say 84-86. 80mph is pretty fast already and its going to take some pretty big jumps in HP to push the hull faster.
05-19-2005, 07:08 PM
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Re: How much fasted should 75hp make it go?
From what Ive been hearing the 525's are really pushing approx. 520-535hp. The 600's on a few 39 Nortechs and OL vs the 525's are seeing approx 2, maybe 3 mph. My guess in a single application would be 3mph, given all the variable were the same. Jeff
05-19-2005, 07:55 PM
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Re: How much fasted should 75hp make it go?
Good answers. I was guessing at 3mph as well.
That's an expensive three miles per hour.
That's an expensive three miles per hour.
05-19-2005, 08:02 PM
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Re: How much fasted should 75hp make it go?
It can be. I'm guessing this boat is in the 28' range? I would guess that you'd pick up a bit more than 3mph with a TRUE 75pshp increase. Unfortunately there is no general rule or formula. WAY too many variables.
05-19-2005, 08:48 PM
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Re: How much fasted should 75hp make it go?
Ron,
We tried this link to a speed calculator.
We took the variables from 3 of our 30 foot Y2K Superboats with 3 different motors. The calculations worked for all of them.
First motor was a 496 mag, 375 HP. between 68-70 on GPS
Next was a 496 HO. We know Keiths boat Once Bitten does 74.2 MPH on GPS.
And Fast Eddie with a 525, best day, 83 mph, gps.
In the calculator I needed to figure out the constant, so I put in the hull weight, 4500 lbs, hp @ 420, and known speed of 74. It gave me a constant of 242.
I then ran the program with the different hp motors. Here is what it calculated.
496mag- 70 mph (right on the money)
496 HO - 74mph (right on the money)
525 - 83mph ( Fast Edddys best )
600 - 88mph from the calculation on the link
I guess we'll all get to see what it does one of these days
Rick
We tried this link to a speed calculator.
We took the variables from 3 of our 30 foot Y2K Superboats with 3 different motors. The calculations worked for all of them.
First motor was a 496 mag, 375 HP. between 68-70 on GPS
Next was a 496 HO. We know Keiths boat Once Bitten does 74.2 MPH on GPS.
And Fast Eddie with a 525, best day, 83 mph, gps.
In the calculator I needed to figure out the constant, so I put in the hull weight, 4500 lbs, hp @ 420, and known speed of 74. It gave me a constant of 242.
I then ran the program with the different hp motors. Here is what it calculated.
496mag- 70 mph (right on the money)
496 HO - 74mph (right on the money)
525 - 83mph ( Fast Edddys best )
600 - 88mph from the calculation on the link
I guess we'll all get to see what it does one of these days
Rick
