Motorized Surfski - How?

Discussion in 'Boat Design' started by doppler491, Jul 22, 2010.

  1. doppler491
    Joined: Jan 2009
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    Location: Canada

    doppler491 New Member

    After researching many possible design ideas I've come to the conclusion that a surfski suits my needs better than most other options, however, I need to figure out where/how best to mount a small inboard or outboard motor to it. Assuming I use outriggers of some-kind for stability where do you think the motor should go - behind the back of the person closest to the stern (through a cutout in the hull); between the two people on board; mounted to a bracket built up from the stern; mounted to a bracket built up from a squared off stern (cut between the back driver and original stern), mounted to the side of the hull on one of the outrigger arms, etc? The motors I had planned on using weigh in at about 50lbs (the inboard is maybe 5-10lbs lighter) and rate in at 6hp. Mounting it directly off the stern seems easiest but the prop will undoubtedly come out of the water when we go over the crest of a wave (and the extra weight of the motor this far towards the back might throw off the good dynamics the hulls inherently have) - hence my thinking that the motor needs to be as close to the centre of the length of the hull as possible. Another easy option seems to be simply mounting the outboard to the bracket of one of the outriggers but I wasn't sure how efficient the hull would be with propulsion coming roughly 15-20" outside of the centre line - would this make much difference at the small horsepower I'll be using? The inboard option looks to be the hardest and would require cutting a hole in the surfski hull but might work best due to it's lighter weight, closeness to the centre of the hull, and lower centre of gravity.

    Please share any thoughts/ideas on this - I really need some expert advice...
    Thanks in advance.
  2. Eralnd44
    Joined: Oct 2006
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    Eralnd44 Wanderer

    To much horsepowr? Perhaps half that is to much.

    No hole in hull. put it outside
  3. Doug Lord
    Joined: May 2009
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    Doug Lord Flight Ready

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  4. waikikin
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    waikikin Senior Member

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