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  1. #1
    Join Date
    Mar 2007
    Location
    Over here
    Posts
    400

    Default 2hp speed challenge

    If I may set the scene - the (Sailing - sorry!) boat is now out of the water and winterised, my current job has me working from home with the potential for some non work tinker time.

    I was brining the accoutrements back in the car, the waft of the 2hp, 2 stoke outboard filling the cabin - I wondered how fast could I make that go...? Previously whilst strapped to the back of a 2.3m, soft floor tender I got the average speed - over a 5 min timed run of 8.3km/h carrying two people.

    Where would one start to design & build over a winter a punt / dory to see if I can get the outboard pushing a faster average speed?

    To set ground rules, this is firmly in the playing category so spend has to be well under 4 figures (pref low 3 figures really) - think more b&q ply than carbon composites & the "boat" has to be able to carry one person.

    Thanks

  2. #2
    Join Date
    Feb 2015
    Location
    Conwy
    Posts
    2,961

    Default Re: 2hp speed challenge

    I dont think you will beat that speed unless you put in a canoe.

    edit : or a catamaran
    Last edited by BruceK; 11-10-18 at 16:03.

  3. #3
    Join Date
    Nov 2007
    Location
    Boat Orwell - Me Norwich
    Posts
    6,145

    Default Re: 2hp speed challenge

    Unlike BruceK, I think you should be able to do a lot better that a flubber, but I agree a canoe or catamaran (or trimaran) type hull worth considering.

    Length, light weight, smooth surface, low profile/lack of windage, and (to cut a long story short, and assuming monuhull) as little lateral form stability as you can get away with, would seem to be things to factor in.

    Someone I met had put a 5hp outboard on the back of a Laser hull, and that went rather briskly!

  4. #4
    Join Date
    Apr 2009
    Posts
    150

    Default Re: 2hp speed challenge

    Itís all about foiling in the high performance sailing world these days...
    Hereís an interesting project https://youtu.be/t3eX507Xi_I

    This is interesting with a 5hp https://youtu.be/SFZwUxEbxW0

  5. #5
    Join Date
    Mar 2016
    Posts
    743

    Default Re: 2hp speed challenge

    If inflatables are allowed, I can manage 12 mph on the gps phone app with a suzumar 2.25 (I think) airdeck and a Suzuki 2.2 (great engine but the lack of tell tale a constant worry)

  6. #6
    Join Date
    Feb 2005
    Location
    Carribbean currently Grenada
    Posts
    6,458

    Default Re: 2hp speed challenge

    Waterline length is your friend. Build something long and skinny and it should reach max displacement speed. Generally agreed to be 1.4 x square root of waterline.
    Monkey patching programmer [retired ]

  7. #7
    Join Date
    Mar 2009
    Location
    Home=Surrey / Boat=Hamble
    Posts
    6,090

    Default Re: 2hp speed challenge

    google hydroplane!

    let plywood be your friend




    in fact google Mini Hydroplane for your project, something like what I have pictured (Bobcat 8) a good start. Simple, and would come in under your budget.. so long as you are handy in the carpentry department.
    Last edited by Firefly625; 12-10-18 at 14:44.

  8. #8
    Join Date
    Mar 2009
    Location
    Home=Surrey / Boat=Hamble
    Posts
    6,090

    Default Re: 2hp speed challenge

    or...

    I wonder how fast it would go on the back of this

    https://www.ebay.co.uk/itm/Boat-jet-...uNxg:rk:4:pf:0

    simple project....

  9. #9
    Join Date
    Feb 2004
    Location
    Boat (now back in) the Clyde
    Posts
    4,782

    Default Re: 2hp speed challenge

    Quote Originally Posted by Dino View Post
    It’s all about foiling in the high performance sailing world these days...
    Here’s an interesting project https://youtu.be/t3eX507Xi_I

    This is interesting with a 5hp https://youtu.be/SFZwUxEbxW0
    Agree. For a project to keep you interested it has to be foiling (but not as heavy as the overweight one in the video).

    Anything else is so last century

  10. #10
    Join Date
    Mar 2013
    Location
    boat conwy
    Posts
    2,590

    Default Re: 2hp speed challenge

    It won’t be a a Honda 2.3 that’s for sure ,it’s like a boys moped all noise and no balls

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