Help selecting a planing hull

Discussion in 'Boat Design' started by fredrosse, Feb 28, 2019.

  1. fredrosse
    Joined: Jan 2005
    Posts: 436
    Likes: 80, Points: 38, Legacy Rep: 56
    Location: Philadelphia PA

    fredrosse USACE Steam

    I would like to purchase a hull appropriate for my next project, since I have finally now been given a "round tuit". Having no experience with planing hulls, I am asking for advice in selecting the most appropriate hull for a new power plant I am building. I want to go as fast as is reasonably attainable, with a monohull, and not a hydroplane.

    A statement of requirements and criteria:

    Boat length 15 to 20 feet, running in protected waters.
    Power plant, fuel, and passenger weight, about 800 pounds total, inboard engine plant.
    Engine , 15 horsepower (11.75 kW) RPM is between 1000 and 2000, if higher RPM is required, then step-up gearing would be required, possible but to be avoided if practical.

    I have a 14 foot O'day sailboat hull, and I cut the centerboard out and installed a one inch shaft, driving a 14 x17 prop with an electric motor at 400 RPM. That boat gave good cruising service for several years, and as an experiment I installed a cheap gasoline engine rated at 13 horsepower, and it made 15 statute MPH. I am thinking of something similar, but with a more appropriate hull form for better speed. Hopefully something I can pick up used on e-bay or ?? for a small cost. If necessary I could build a hull in plywood, but if I can buy something appropriate the costs would be much lower.

    Thanks in advance for advice from the knowledgeable people here.
  2. gonzo
    Joined: Aug 2002
    Posts: 16,391
    Likes: 1,428, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    If you want the most speed for the power, a jon boat will probably work fine in protected waters. You can find them used for not too much money.
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