balboa26 converstion to motorboat

Discussion in 'Boatbuilding' started by aaron gilligan, Jun 3, 2018.

  1. aaron gilligan
    Joined: Jun 2018
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    Location: halifax nova scotia

    aaron gilligan New Member

    hey everyone I have a balboa 26 that I want to convert to outboard power only should I remove the swing keel or just leave it ?
  2. upchurchmr
    Joined: Feb 2011
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    Location: Ft. Worth, Tx, USA

    upchurchmr Senior Member

    Go buy a real motorboat.
    Nothing will work right.
  3. fallguy
    Joined: Dec 2016
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    Location: usa

    fallguy Senior Member

    Never gonna go much faster than 7 knots.

    You are forgetting about that critical thing called hull speed.

    Lots of guys just put the ob on and never raise the sails. Join that club; there is no shame in it.

    But if you put a 50hp engine on the back of that boat and remove some keel, I doubt you'll ever get much more than the 7.

    Max Speed equals 1.34 x sqrt(WL) or 1.34 rt(26) or 6.8kts.

    Some of the engineers here might have better answers, but don't mess with the boat bud.

    She is what she is.
  4. upchurchmr
    Joined: Feb 2011
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    Location: Ft. Worth, Tx, USA

    upchurchmr Senior Member

    Lots of shame in never using the sails IMHO.
    I saw a guy with sails up, motoring as fast as it would go, with the sails sheeted on the wrong side of the boat. Ignorant and dangerous.

    If you just motor, you might at least take off the mast.
  5. goodwilltoall
    Joined: Jul 2010
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    Location: nation of Ohio

    goodwilltoall Senior Member

    If 7mph is okay go 4 it. Lotsa places u can access with 20" draft.

    Depends on hpw much u want to invest, if it was mine i would take out cb and rudder then add long shallow keel 6 to 8" deep with attached long shallow rudder right up to bottom of hull or hanging rudder with ob in well just fwd of it.

    With 10hp you might get upto 15mpg or more doing about 6mph
  6. Chuck Losness
    Joined: Apr 2008
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    Location: Central CA

    Chuck Losness Senior Member

    Do a search for "strawlers" and you will find some useful information. As everybody has said no matter how much horsepower you hang off the stern you will not go much faster that hull speed. Extending the transom 2 feet or so may clean up flow and help a little but you will still be pretty much limited to hull speed. If you are happy with that go for it. If you want to go faster than that get a similar size powerboat. As a rule of thumb 1 hp per 500 lbs displacement will power you at hull speed.
    And you will need some ballast. I would just leave the centerboard in the up position. If you remove it you will have to add ballast.
    Have fun with your project.

  7. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    There is nothing wrong with motoring with a sailboat. One thing you will notice when you take off the mast is that the period of roll is shorter (rolls faster).
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