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  1. #11
    Registered 99fever27's Avatar
    My Boats:
    Join Date
    Dec 2005
    Quote Originally Posted by 10x View Post
    3500 rpm = 70 mph. 17 X 31 4 blade prop, 1.33 drive ratio.

    show off...

  2. #12
    Who Me? Platinum Member FeverMike's Avatar
    My Boats:
    2006 38TE Fountain
    Join Date
    Jan 2001
    My 29 fountain HP 500 cruised at 4000rpm 54 mph. Max rpms is 5300.

    My 38 Fountain CC with triple 275 Verado's cruises nice at 4500rpm at 52mph. Max rpms is 6300.

  3. #13
    My Boats:
    Fast Boats , Fast Cars
    Join Date
    Nov 2000
    PA USA
    I run around 3500 to 3800 @ 65-68mph

  4. #14
    10x is offline
    10x VIP Member 10x's Avatar
    My Boats:
    1989 10 mtr Fountain
    Join Date
    Dec 2003
    La Grange Ill
    Quote Originally Posted by 99fever27 View Post
    show off...
    I've seen better. Drove Bill Taylors 42 Fountain Poker Runs America boat on Lake Michigan in summer 05, and seen just under 4000 rpm in the mid 80's
    Attached Images Attached Images

  5. #15
    Registered Platinum Member
    My Boats:
    '93 43' Scarab "5" boat, 38 Scarab Miami Vice edition
    Join Date
    Feb 2005
    My Scarab with trips & 17x31 4 blades 4000 is 67-70 (gps). My GTX with 17.5 x 34 5 blades 4000 is 98-102 (gps).

  6. #16
    Registered Downtown42's Avatar
    My Boats:
    2005 42' Fountain SOLD
    Join Date
    Nov 2003
    1 Flu Ovr KuKos Nest-WI
    General rule is 75% of WOT is cruise speed.

    95% for diesel boats.

  7. #17
    Registered User JB4Boyne's Avatar
    My Boats:
    Join Date
    May 2005
    Boyne City, Mi.
    According to on most stock motors your peek fuel economy is at 2800, but I know it's hard to go that slow.
    As far as how hard it is on your motors 3000 vs 4000, my Merc manual says that marine engines were made to run at WOT for extended periods of time??? JB

  8. #18
    Geronimo36 Gold Member Panther's Avatar
    My Boats:
    36' Apache Warrior
    Join Date
    Sep 2002
    Elkton, MD
    32-3600 depending who's on the boat and what the sea conditions are. The boat like 3600 the best which is 58 mph.

    As far as fuel efficiency... even if the motor is fuel efficient at 2800 the hull may not be so you actually burn more fuel cause you're running a lot slower. I don't know the science of the deal but when you drive the boat enough you just "know" what the best cruise speed is for efficiency, comfort, speed etc. If you burn 30 GPH and it takes you 2 hours to get there it's the same as burning 60 gph when it only takes an hour...

    In my case I need to get the boat out of the water and STAY out of boost for good range.
    Last edited by Panther; 02-10-2007 at 08:49 AM.

  9. #19
    Registered Tazz's Avatar
    My Boats:
    Outerlimits 37 Quadstep, Hustler 377 Talon
    Join Date
    Jun 2005
    4400 rpms, 92 mph
    Attached Images Attached Images

  10. #20
    Gold Member Gold Member AppSysCons's Avatar
    My Boats:
    CURR: 230LX, PREV:2007 30 Skater, 2003 36 Skater,1998 37 OuterLimits, B-Class race 28 Magnum
    Join Date
    Oct 2000
    Port Charlotte, FL
    Based on 75% of Wot (WOT/cruiseRPM/CruiseMPH)
    These are actual numbers, I have recorded lots of data on all of my past and current boats.

    98 OuterLimits, T840hp, 1.36gears, (5800/4350/85mph)
    Magnum race boat, T 650hp, 1.50 gears, (7500/5500/78mph)
    Stingray 230LX, 350magMPI, 150 gear, (4500/3375/44mph)
    Frank Fasulo
    2004 Stingray 230LX
    Canon 7D | EF-S 18-200mm f/3.5-5.6 IS
    Thousands of pictures at

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