Drifter skiff

Discussion in 'Boat Design' started by DriesLaas, Dec 30, 2016.

  1. SaltOntheBrain
    Joined: Feb 2007
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    Location: crosbyton, TX

    SaltOntheBrain Senior Member

    Pics...or it didn't happen.
     
  2. DriesLaas
    Joined: Aug 2009
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    Location: South Africa

    DriesLaas Weekend Warrior

    I know it's as rough as anything, but here is the proof. I start sanding tonight.
     

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  3. DriesLaas
    Joined: Aug 2009
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    DriesLaas Weekend Warrior

    And I need to make time to clean up the workshop
     
  4. SaltOntheBrain
    Joined: Feb 2007
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    Location: crosbyton, TX

    SaltOntheBrain Senior Member

    Thank you for the pics, DriesLaas. I'm about to start one just a little longer than yours and expect it to just barely plane with my old 4hp Mercury. I also have a six horse that needs a little work and I'm hunting for a used 8 or 9.9.
    kfly,
    What size outboard do you have on your boat and what kind of performance do you see from it? Nice little boat!
     
  5. DriesLaas
    Joined: Aug 2009
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    Location: South Africa

    DriesLaas Weekend Warrior

    The latest progress: top is sanded and epoxied. Now to turn and finish the bottom. I'm running the boat unpainted in some rough sea to see if the structure is OK, before painting. Plus I'm tired. No strakes for now, I will add as required.
     

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  6. tom28571
    Joined: Dec 2001
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    Location: Oriental, NC

    tom28571 Senior Member

    Wat is the current weight?
     
  7. DriesLaas
    Joined: Aug 2009
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    Location: South Africa

    DriesLaas Weekend Warrior

    Hi Tom,
    I have not weighed recently, I still guess 75kg finished. Time will tell, not long now.
     
  8. DriesLaas
    Joined: Aug 2009
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    DriesLaas Weekend Warrior

    Flat bottom!
     

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  9. DriesLaas
    Joined: Aug 2009
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    Location: South Africa

    DriesLaas Weekend Warrior

    Bottom glassed and sides epoxied.
    Tomorrow I can play, weather allowing.
     

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  10. DriesLaas
    Joined: Aug 2009
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    Location: South Africa

    DriesLaas Weekend Warrior

    28 days since the first sheet went on the cnc router
     
  11. DriesLaas
    Joined: Aug 2009
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    Location: South Africa

    DriesLaas Weekend Warrior

    And as Murphy would have it, tomorrow is blown out and pouring rain. But Zululand is dry, so we are all thankful for the water. But Sunday afternoon seems OK.......
     
  12. DriesLaas
    Joined: Aug 2009
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    DriesLaas Weekend Warrior

    82kg is the final answer
     
  13. DriesLaas
    Joined: Aug 2009
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    Location: South Africa

    DriesLaas Weekend Warrior

    Well, back to work for me today after a glorious summer holiday. The skiff is on the water, after a manner. Still some things to sort out:
    It is a little too heavy at 82kg, I wanted a lighter boat.
    The motor cavitates like a demon, so I probably need to drop it an inch at a time to see if it makes any difference. I should do a slight tweak of the trim angle as well. Not confident that this will solve everything....
    The max speed I saw was 9.3 knots, which is disappointing. This has everything to do with the fact that I can't get power into the water.

    I saw no sign of bad behaviour when turning, but this is because the turning speed was relatively low.

    The boat is drier than I expected, again at sedate speed. Pounding was noticeable, but not excessive.

    The fore aft trim is also not clear yet, I have to get proper video footage from an outside viewpoint to try and get more info. It feels OK though.

    Static stability is good, and I will be able to fight fish around the boat without any problem.


    The concept of the boat is very nice, and it will see extensive use. The boat "works" and my youngest daughter had a big smile on her face after her first spin, so that counts for a lot.
     

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  14. ondarvr
    Joined: Dec 2005
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    Location: Monroe WA

    ondarvr Senior Member

    Looks good.

    If you could get to that speed with it ventilating you should be able to get to a respectable speed with it adjusted correctly.
     

  15. DriesLaas
    Joined: Aug 2009
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    Location: South Africa

    DriesLaas Weekend Warrior

    Thanks for using the term "ventilating."

    It is of course quite correct, cavitation is when the low pressure on the prop blade reaches the evaporation pressure of the water and it "boils."

    In my case I think the prop is being ventilated from the surface, which should be improved by lowering the motor.
    From a quick bit of research it seems that the conventional wisdom of keeping the anti-ventilation ;-) plate in line with the bottom of the boat is applicable to higher powered motors, and these small motors want to run an inch or two deeper.

    Does anyone have a feeling for how sensitive the motor is to the mounting height?
    Do I cut an inch from the top of the mounting plate, or start with less?
     
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