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Thread: Tunnel hull and surface drives?

  1. #1
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    Jul 2011
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    Default Tunnel hull and surface drives?

    I have been following the interest in using surface drive outboards and was wondering how they would do with a tunnel hull to allow running a little shallower. Since the prop sits farther back- therefore moving laterally more when turning I didn't know if it even made sense. Any input would be appreciated.
    BEE

  2. #2
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    Sep 2008
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    Chugiak, Alaska
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    AKBEE The general rule is that a Surface Drive does not run well with a tunnel. I am not a physics engineer but basically this is what I have gleaned from running various boats with surface drives. The disturbance of the water flow caused by the tunnel does not allow for the prop to grab the water and the net result is a loss of thrust, power and speed. All that said, I have a boat with a tunnel that runs very well with a 35Hp Go Devil surface drive. My suggestion is if you have a boat with a tunnel, try it and see how it works. If your in the market for a boat I would shy away from tunnels and get a smooth bottom boat to start off right. Duckdon

  3. #3
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    Duckdon:

    Thank you for your comments- I appreciate it.

    BEE

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