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  1. #16
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    Toffy,i came across a 26 big ear merc offshore cut that was hubbed for an omc,over the hub btw.it is the best handling prop I've run yet.no chinewalking at all

  2. #17
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    Quote Originally Posted by Toffy View Post
    all questions answered, thanks !
    Time to look for a chopper. 26P big ear, must fit 15spline Yamaha shaft
    Chopper props don't sell second hand very often here in Belgium, so this could take a while T.
    I have a 24 and a 28, which are at least in Europe, but no 26...
    Markus' Performance Boating Links:
    www.toastedmarshmallow.com/performance

  3. #18
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    Modified to fit OMC means it should still fit straight on a Merc. I seem to remember reading Yammie is the same as Merc.
    I was going so slow I almost crashed. - JamesGang

    1978 24 Superboat - 250 EFI
    Sold: 1991 Starliner - 250 EFI Merc 3.0

  4. #19
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    Quote Originally Posted by JohnR View Post
    I seem to remember reading Yammie is the same as Merc.
    yup

    Can someone explain what these are : "Offshore or an allison cut chopper"
    Are these different ways to remove the weedcutters ? What does it look like ?

    Thanks !

  5. #20
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    Here's a good example of this type of cut. The leading edges have been trimmed, the cutters and leading edge of the blade root have been ground away, and some mild cup has been added. Hoss makes some nice props that are close to this style.

    '89 Hydrostream Vegas XT, '90 Merc 2.4 Bridgeport PCU EFI
    My YouTube videos________My Flickr photo gallery
    http://www.facebook.com/profile.php?id=1706097519

  6. #21
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    Thanks Pyro !

  7. #22
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    Toffy have you tried Nico at Bernico? They have loads of props


    Phantom 19G-R - E-TEC 115HO
    www.facebook.com/slayeroffshore

  8. #23
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    Hi ! Thanks for that advice. I already talked to him and this seems definately the way tho go. But for now I don't want to go that way, as after a proptest session I would feel obligated to buy a new prop from him. Nothing wrong with that off course but I just don't want to spend that kind of money. It's still a hobby, and there must be a good second hand prop out there for me that can outperform my Tempest Plus

  9. #24
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    Quote Originally Posted by Toffy View Post
    Hi ! My boat is a Phantom 21ft with a strong running Yamaha 200hp V6 2stroke carb
    Current prop is a Tempest plus 14 1/2" x 25P. I'm running close to 6000rpm.
    You have been given excellent advice on choppers but from reading what boat, motor and prop you have run and what you want I recommend you try either a Yamaha T1 or M in 26 pitch or a Turbo lightning 26. They will all give you more overall lift, including stern to help your speed, give excellent handling and no chine walk. I have run every prop you have mentioned on here.
    1990 22' Activator Yami HPDI 300-sold
    1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
    1982 21' Superboat
    1990 22' Activator yami OX66 Vmax 250
    1982 30' Scarab-twin 200 Merc-sold
    1979 21' Challenger 300 Evenrude-sold
    1979 21' Superboat 200 Merc-sold

  10. #25
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    Nice advice from someone who've tried em all, thanks ! I'll surely try them when I get the chance. :up:

  11. #26
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    Hi all,

    I've found some more info and pictures on different cuts.
    It seems that a chopper with standard blades can be cut to different styles...

    http://www.sdspropshop.com/Prop_Work/Prop_Work.html

    Why would you chose for a specific style of cut ?
    Could one say a certain style always leads to a specific handling of the boat ? eg. less chinewalk, more bowlift, more top-end...

    Thanks for sharing info,
    Kind regards, T.

  12. #27
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    That's Steve... He's a vendor on this forum.
    '89 Hydrostream Vegas XT, '90 Merc 2.4 Bridgeport PCU EFI
    My YouTube videos________My Flickr photo gallery
    http://www.facebook.com/profile.php?id=1706097519

  13. #28
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    Quote Originally Posted by dnelson964 View Post
    You have been given excellent advice on choppers but from reading what boat, motor and prop you have run and what you want I recommend you try either a Yamaha T1 or M in 26 pitch or a Turbo lightning 26. They will all give you more overall lift, including stern to help your speed, give excellent handling and no chine walk. I have run every prop you have mentioned on here.
    Quote Originally Posted by pyro View Post
    The Tempest is a big, strong, load-carrying prop with lots of lift. If you like how it runs, the Chopper is probably a step backwards.
    Hi ! I did some fun proptesting this weekend :
    - Tempest Plus 25P : 115km/h @ 5900rpm
    - Chopper 28P : 108 km/h @ 5800rpm, too much ventilation, takes long to get on plane and when it starts to pull. better handling at speed and also shorter cornering compared to the tempest plus, similar bowlift though where I expected more...
    - Cleaver 26P : never got on plane... didn't expect it to be that bad. I probably need more engine height for that cleaver but I don't have a low water pick up.

    Still got some testplans :
    chopper 26P (It'll teach me if I must let go 3blade over the hub type of props)
    Pro ET 26P (I expect great things from this 4 blade prop)

    for the longer future :
    Trophy Plus (should accelerate fast, curious about top speed numbers)
    Turbo lightning, Yamaha drag, T1, M.... if I can find them

    Kind regards,
    T.
    Last edited by Toffy; 07-09-2013 at 11:32 AM.

  14. #29
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    The problem you have with getting on plane has to do with the prop venting too much. If your exhaust was relieved somewhere other than the propshaft it would get on plane much better. I can't get my baja to plane out with an over hub prop cause it just vents real bad.
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

  15. #30
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    With a true surface prop, when the boat initially lays down on plane, there is a great amount of slip as the prop first meets the surface-- the prop is trying to grab more water than the surface can provide, as the boat's speed hasn't yet caught up with the speed of the spinning blades. Relieved exhaust will control the initial rev-up when you first hit the throttle, but it can't do much to control the planing slip that occurs afterward. The best approach is to give full throttle at first, so the boat has some momentum when it lays down, then feather the throttle to allow the water to fall into the blades before getting back on the throttle again. With some props, you have to just stand on the rev limiter until it catches the water.

    Props such as the Trophy have a heavy trailing edge with lots of cupping cast into the blade. These props will have less planing slip, even when you run on the surface.
    '89 Hydrostream Vegas XT, '90 Merc 2.4 Bridgeport PCU EFI
    My YouTube videos________My Flickr photo gallery
    http://www.facebook.com/profile.php?id=1706097519

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