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Seafury Surface Drives

Discussion in 'Technical Discussion' started by HTMO9, Apr 17, 2015.

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  1. Beau

    Beau Senior Member

    Joined:
    Jan 15, 2010
    Messages:
    1,871
    Location:
    Cold Spring Harbor, NY
    The technical discussion here is well beyond me, but all the photos are great. On another thread we were talking about serious fishers not getting much on resale ... here's why. Hope he at least won the tournament and a calcutta or two
  2. CaptPKilbride

    CaptPKilbride Senior Member

    Joined:
    Mar 16, 2004
    Messages:
    522
    Location:
    Live in Maine, work in the Gulf of Mexico
    Just curious to know how submerged your drives were when you got these numbers? Are you seeing a lot of bow lift and/or loss of speed when you raise the drives to where the motors will turn up more? I assume you are trying to get the DDEC's to turn up to 2300 RPM at WOT?
  3. Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    11,570
    Location:
    Fort Lauderdale
    Well, searching for 100-125 rpms more and less load at cruise, mainly less load at cruise speed. Boat runs pretty flat at 32 knots WOT no matter what you did with the drives. It's a bit underpowered with the 8v92's 760hp because due to the hull design if you run it less than 27 knots, it will end up continuing to slow down and slow down over a period of several minutes, engine load climbs and climbs and then eventually the boat falls off of plane, but currently that was 2025 rpms and 89/90% load to maintain speed and keep it on plane. Cruise it likes just a touch of trim tab and the drives down just a touch more than WOT. Boat was set up wrong from the start as 2 small fuel tanks (100 gallons each) were permanently deleted, and then 2 36 gallon fresh water tanks were added in the chain locker in the bow by either BAIA or the first owner to try to shift the trim foward to help it get on plane and stay on plane. They built a handful of the 59's with 8v92's and then all subsequent ones were with 1150hp MTU 12v183's. What it really needs is a set of C18 acerts!

    It runs best WOT with drives only 1/4 way down and no tabs, and it runs pretty flat at this speed, if you bring drives up or down from here, running attitude stays pretty much the same and boat will lose a little speed and gain or lose a little rpm's depending on which direction you're going with the drives but never saw more than 2280 rpms that was elevating the drives and losing a lot of speed. I also did a seatrial with Mark Wilson (a legendary raceboat driver back in the day) and who is doing the props and he got the same results. So mark changed the geometry on the blade tips, added some pitch near the hub for stern lift, and a few other things to them the second time around. Got them back last Wednesday and props are still sitting on the dock and won't be installed till Tuesday.

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