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Black Watch Alpine


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  • 1 Post By southernman
  • 4 Post By Maca49
  • 1 Post By Tikka7mm08

Thread: What size HP outboard do I need?

  1. #1
    Member Tikka7mm08's Avatar
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    What size HP outboard do I need?

    Hi - I have a Takacat 3m inflatable (pontoon). It weighs about 32kg. I would like to have 2-3 free divers on board so say 300kg (probably only 2)? I'd love a little DF2.5 but any idea what size I need to run to get around at an ok pace (not flying off waves but not getting pushed backwards in a 5knot current/wind)??

  2. #2
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    Most boats have a max HP rating chart, should be something under boat specs, I would not put the miminum spec, outboard on any boat, you need to have enough grunt (hp) to get up on plane, if the outboard is too small, it may not be able to do so, and you will have a displacement hull, and thus slower with higher fuel consumption. a little bit more than minimum, has a bit of a safety advantage, allowing you to push against an strong outgoing current, or if coming in over a bar to maintain a speed, and come in sitting on the back of a wave,
    I am going to guess at 5-6hp or so, as its only a 10 foot hull, would be good.

  3. #3
    Member Tikka7mm08's Avatar
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    Cheers for that...yes max is 9HP from memory...problem is this is a pack it in the bag boat so looking for an outboard that can be picked up and carried...they really jump up in weight from 5hp or so. Seems just have to live with it.

  4. #4
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    ok, I didn't realize that, but makes sense now, why you were looking at a 2.5 hp, I likely go with mid of the range, 5 or so, two stroke will be lighter than a four, but they are getting closer in weight every year,
    A little electric may also work quite well, I have a 55lb thrust minkota on my old boat in Canada, a 17 foot lund, with a 115hp out board, and it pulls at along (Bow mount) at a very good clip. 10-15 km hr at a guess. runs for hours on a car battery.
    Tikka7mm08 likes this.

  5. #5
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    Geeze you need my 8 HP johnson
    Boom, cough,cough,cough

  6. #6
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    Iv got a little 5hp merc
    we went with that because it is the largest you can go with the incorperated tank in the top
    pushes my mac 270 ok but dosent plane
    planes the heck out of a 10footer

  7. #7
    Member Tikka7mm08's Avatar
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    Thanks Bill - yep it would be handy to have the tank on top of the motor, easy to have fuel cans to top up. I think 5HP is about tops for this set up.

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    I think your gonna be 3 short
    Boom, cough,cough,cough

  9. #9
    Member Tikka7mm08's Avatar
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    LOL - I see I can go to a 6HP 4 stroke at 26/27kg with the integrated tank...that should be plenty.
    Maca49 likes this.

  10. #10
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    Suzuki 6hp 4 Stroke Outboard. | Trade Me

    What I need - great internal capacity at 1.5L vs 1.1L for others, and I think it is a better gear ratio at 1:under 2 others 1ver 2...??
    Now to find it for a $1000 cheaper.

  11. #11
    Member Tikka7mm08's Avatar
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    That face in the word "over" is a typo but I like it so much I am not going to edit it out.

 

 

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