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Any Guesses on speed

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Old 12-06-2003, 09:15 AM
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Post Any Guesses on speed

I am currently running Merc 6a's (wet) with 598 c.i. Cobra's 1671 airlock blowers, 7to 1 comp. ratio. 92 octane. 1100 h.p. ,1050 ft. lbs of torque. 40 ft. Skater at 10,500 lbs. Current speed with 16.5x37 Rolla's is 143 mph on gps with 1oo gallons of fuel and 2 people on board. I am going to Dry sump drives, Change pullys from 9 lbs of boost to 12 lbs of boost and burn cam 2. I am also changing drives from 135 gear ratio to 124 ratio. Am thinking 16.5x35inch 4 bladers. Any guesses on speed? Motors should produce from what I am told about 1400 h.p.
Stan
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Old 12-06-2003, 10:05 AM
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Stan-
Have you used the speed calculator on Marc/ Bam's site?
I've found it to be helpful
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Old 12-06-2003, 10:13 AM
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Forgot to ask: what engine RPM did and will you turn?
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Old 12-06-2003, 10:52 AM
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ssorry, thought about it while outside smoking a deer hind-quqrter. 6100 r.p.m.
Stan
p.s. I think we were at about 10% slip
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Old 12-06-2003, 10:59 AM
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thuoght that was david wade power
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Old 12-06-2003, 11:04 AM
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David worked with Randy on project. Randy has engines right now freshening them up after Orange Beach
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Old 12-06-2003, 11:14 AM
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I think if you plug all that back into Bams sight the computer will start to smoke and the site will crash I am going to give ya 10-15mph increase

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Old 12-06-2003, 11:15 AM
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How do you get to marc/bams site
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Old 12-06-2003, 11:24 AM
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http://go-fast.com/boat_speed_predictions.htm

Last edited by Open72; 12-06-2003 at 11:27 AM.
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Old 12-06-2003, 11:33 AM
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Stan-
Using your existing specs and speed, according to Bam's calculator you're running 10% slip: as you said.
Using the new info: ratio and your -existing pitch-, the new speed would be about 155 at 6100 rpm. My guess is to try your existing prop before changing to less pitch. At least that will give you a base line. Here's the link:

http://www.go-fast.com/Prop_Slip_Calculator.htm

He has other "calculators" on his site too.

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