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  1. #1
    Registered
    My Boats:
    1983 Chris Craft Scorpion, 1984 Donzi Hornet III, 1995 Python
    Join Date
    Jul 2010
    Location
    Seabrook, Tx
    Posts
    111

    Boat is scary now

    Boat: 1995 Python 24', 540cid 625 hp, B1 with hydromotive nosecone. Propshaft is approx 6.5 inches below bottom of boat.

    Boat will run 85 but wants to chine walk above 80. I have to trim a lot to get the bow to lift (also, bow will not lift until I am over 4500 rpms). I have a 25 Mirage, and 26 Turbo and both have very similar top speed. M25 turns 5850, Turbo is turning 5550. I have not tried a 4 blade.

    What prop if any would maybe help?

  2. #2
    VIP Member VIP Member scottw's Avatar
    My Boats:
    Switzer 250SS
    Join Date
    Apr 2006
    Location
    Wenonah, NJ
    Posts
    539
    I read on the Mercury Racing site that the Mirage Plus gives you maximum bow lift. I run a 23p Mirage on my Switzer and the boat is really stable at speed. Tried a 24p Bravo 1 and that seemed to raise the transom. Made the boat seem really loose. Cruise speed was better but top end was equal. My prop is 5.5 inches deep but I only have a 21 degree deadrise. Also I am not pushing the HP you are putting out.

  3. #3
    Registered Revd Up's Avatar
    My Boats:
    2005 Velocity 260
    Join Date
    Jan 2001
    Location
    Rockford, IL
    Posts
    804
    Quote Originally Posted by Flying Tomato View Post
    Boat: 1995 Python 24', 540cid 625 hp, B1 with hydromotive nosecone. Propshaft is approx 6.5 inches below bottom of boat.

    Boat will run 85 but wants to chine walk above 80. I have to trim a lot to get the bow to lift (also, bow will not lift until I am over 4500 rpms). I have a 25 Mirage, and 26 Turbo and both have very similar top speed. M25 turns 5850, Turbo is turning 5550. I have not tried a 4 blade.

    What prop if any would maybe help?
    I would try a 26 pitch Bravo 1, or possibly a 28P since your running 625 hp.. The 4 blade should make the boat handle much better. If you want more bow lift have it labbed with some cup on the tips of the blades.
    But before you do that, I would gather as many different props you can from your buddies ,and test them all in a couple hours ,on the same stretch of water. You will have a much better idea of what works and what doesn't for your boat.

  4. #4
    Registered
    Join Date
    May 2010
    Posts
    632
    Quote Originally Posted by Flying Tomato View Post
    Boat: 1995 Python 24', 540cid 625 hp, B1 with hydromotive nosecone. Propshaft is approx 6.5 inches below bottom of boat.

    Boat will run 85 but wants to chine walk above 80. I have to trim a lot to get the bow to lift (also, bow will not lift until I am over 4500 rpms). I have a 25 Mirage, and 26 Turbo and both have very similar top speed. M25 turns 5850, Turbo is turning 5550. I have not tried a 4 blade.

    What prop if any would maybe help?
    The fact that you are running a python 85 is part of the problem. I have owned two back when they were the baddest thing on lake lanier and I can tell you Jim never built them to do 70 let alone 85. A few guys in the lake pushed them that speeds and it was always a monster. The hull is just not designed for it. If you are stable at 80 it's probably because you have k planes. Not trying to knock th boat they were fun but like I said just not designed to go that fast. A far as props the mirage was always the fastest since the boat need a lot of bow lift. We used bravos with a lot of cup to get rid of the porposing at around 65mph.

  5. #5
    Gold Member Gold Member Dave M's Avatar
    My Boats:
    2006 30 Superboat
    Join Date
    Oct 2000
    Location
    LaPlata, MD, USA
    Posts
    4,537
    The 24 Superboat I owned chine walked all over the place with a Mirage+. A bravo prop settled it right down.

  6. #6
    Registered
    My Boats:
    28' Bertram, 24' Python (gone), 22' Velocity, 20' Sea Ox
    Join Date
    Jul 2010
    Location
    Windsor, NC
    Posts
    347
    I have a hot boat aritcle where they tested a 24 Python from the factory with a 454 and a supercharger and 1.36 drive. They ran a 25 mirage and said they stopped testing at 83 due to the boat being so scary although it had more left in the motor.

  7. #7
    Registered AIR TIME's Avatar
    My Boats:
    BAJA OL 650HP/ SABER 28 Gellner unlimited with konrad ace
    Join Date
    Dec 2000
    Location
    EASTON MA.
    Posts
    6,251
    do you have full hyd steering, that helps alot. I have a new one for sale since my konrad ace came with its steering. add on helps a little, thats what I had on my baja 24ol that went mid 80s. but walked. you can learn to drive it by sawing the wheel and keeping it straight. props call brett bblades. b1 26


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