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help with estimate of top speed

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Old 02-02-2002, 12:31 AM
  #11
merlin540
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tomcat here is the scoop. i bought the boat with 600 hp small blocks. single carb <1150 dom> it had 1.68 ratio big shaft #4s and it had 17 1/2 by 30 3 blade props. it ran 107 on gps and radar at 7800 rpm every time. engines that are going in the boat are my old 540's punched to 565's 1271 blowers w/superchillers with 12psi boost mech roller w/shaft rocker system. coated pistons on the skirt and dome also cyl head and valves coated. has daytona crash boxes and 1.31 ratio drives now. i have both 3 and 4 blades props from ratio 30 to 34 pitch. the engine will run 7000 rpm if needed. this will be a killer poker run boat you can see pics of the boat at www.hadleyperformancemarine.com
this boat is the replacement for my eliminator that i wrecked over the summer. also its on stadoff boxes and the propshaft is 3" above the bottom of the boat. see ya
 
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Old 02-02-2002, 12:33 AM
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merlin540
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also boat with small blocks weighed 6200lb totally rigged with 100gallons of fuel see ya
 
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Old 02-02-2002, 12:41 AM
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One Bad Cat
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Killer Boat. Are you Joe Mamas friend...
If you are, Im the guy that sold him his Cat...
 
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Old 02-02-2002, 10:09 AM
  #14
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Hay 540 now 565 or beeter I think in the last power boat mag they have a new style 32 with 575s running 123 no brainer you should easilly see 130 just be carfull poker runs get pretty rough water for that boat good luck and try to keep those rpms down those biger motors dont like them
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Old 02-02-2002, 10:44 AM
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HydroScream
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sick, sick ride....
Just in calculating your gear ratio, rpm and prop pitch it looks likt @0% slip you would run between 160 and 170 depending on rpm Factor in some slip and I'd say you would be running 145 to 150.... as said before, I think 135 is a no brainer

nice boat man, be careful
 
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Old 02-02-2002, 10:55 AM
  #16
merlin540
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yes i am joemama's friend.
 
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Old 02-02-2002, 03:31 PM
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One Bad Cat
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Merlin, Your the guy that had the De-Laminator, and the American Offshore. Mama told me about your toys.. Awesome. That Skater ..Using my formula @ 6500 RPMs and 34 pitch and 10% slip. which I know is high. =145 MPH + That boat will be on a rail. Ive been in a 2000 36 Skater with 1200 hp and was blown away with the handling and performance.. Felt very solid at 150 +
Tell Mama I said hello.
 
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Old 02-02-2002, 05:56 PM
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Merlin540 - Check your email for new graph.
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Old 02-02-2002, 08:36 PM
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Bruce
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Merlin, where the original engines moved forward and using jackshaft's, or are they back in standard location. If the engines need to turn that hard I'd say you've got to much prop. It's a good starting point, hopefully you are turning the props out. Rigged like it is the boat won't want much positive trim, I'd run it up with the drives neutral trim and let the hull lift. Watch the turns at higher speed, the 32's can get exciting. The boat will probably not like the three blades unless the engines are forward. Have fun, be safe.
 
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Old 02-02-2002, 09:18 PM
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Merlin
Here in a formula that will help ,it is as accurate as you can get without testing the boat.
(RPM Divided by gear ratio x prop pitch divided by 1056 and subtract slipage. 10% is a good # for a Skater.
Hope this helps
Loy
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