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help with estimate of top speed

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Old 02-01-2002, 05:12 PM
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merlin540
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how fast do you think my 32 skater will run??
1000hp supercharged engines #4 drives 1.31 ratio with 34 pitch 4 blades i want to see 135mph do you think that is possible. want to turn engine between 6500 to 7000 rpm. thanks to the members of offshore only for the help!!!!!!
 
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Old 02-01-2002, 05:19 PM
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lifes a bore from shore
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Have a friend that has same ratio and pitch with 502 crates just carbs 36'awasome cat and he runs 112mph 5800rpm so you should see it go man go
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Old 02-01-2002, 05:23 PM
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My 36 foot cat with a pair of 1000's, number VI dry sumps with 1:33 gears and 17 1/2 35, 5 blades, runs 153 on GPS. Yours should easily run in the high 130's. Good luck and let me know if you have any questions.
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Old 02-01-2002, 05:25 PM
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lifes a bore from shore
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he is difinitly spinning those boys hard
but it takes alittle while to get there depending on the wind to lift the tunnel up
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Old 02-01-2002, 05:29 PM
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Otto those five blades arn't cheap, do you think there wroth the money compared to the 4 blades I have 17 1/2 29 #5 drives how much slip do you lose by changing? nice ride
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Old 02-01-2002, 05:32 PM
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They really only changed two things,Vibration and handling(handles like it's on rails).
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Old 02-01-2002, 05:33 PM
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And yes they were worth it!!
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Old 02-01-2002, 05:35 PM
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Thanks Otto i heard they reduce slipage buy 7-8% is that true
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Old 02-01-2002, 05:37 PM
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If the boat is already hooked up with the 4 Blades then 6-8 % is rather optimistic.
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Old 02-01-2002, 08:31 PM
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Hey Merlin540 - Using your hull and a pair of 900SC in my power vs. speed program I get 145 mph with that pitch and ratio. Assuming ideal slip of 5%, that would happen at 6000 RPM.

There have been a few 32s built with 800SC, but it seems to me they were often quickly traded in by their owners for 36 Skaters. Wasn't there a 32 in a magazine last year with 1000+ HP going 150? Scary.

If you could send me more info on weight, engine specs and speed with original engines and props, I could fine tune my prediction.

Wicked ride man!

[ 02-01-2002: Message edited by: tomcat ]
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