Planing Electric Dinghy

Discussion in 'Boat Design' started by feunatz, Nov 13, 2016.

  1. feunatz
    Joined: Nov 2016
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    feunatz Junior Member

  2. BertKu
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    BertKu Senior Member

    Hi Feunatz, very interesting concept. should work well. I like out runners, special when the water cooling pumps through the windings. Good luck.
    Bert
     
  3. Irie
    Joined: Jul 2016
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    Location: Usa

    Irie Junior Member

    In response to your other thread. Here are some links to information i used when i started thinking about my drive.

    The Burmese Long tail use a single u joint outside the hull but there doesn't seem to be much technical info on the web. It is discussed here on this forum and also on this blog.

    The Arneson type drive use a double cardan inside a ball joint outside the transom. Some mud boats utilize the same concept with out the ball joint as seen here and on this forum here.

    Tom Kane's pivotal drive and smart drive use a cardan shaft with sliding spline .

    Lots of ways to do it, just a matter of what works best for your application.
     
  4. portacruise
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    portacruise Senior Member

    Pivoting outboard concept is the best for steering IMHO. Rudders don't work at low speeds like when docking, or when traveling in the same direction as the current at the same speed (like in rivers).

    PC
     
  5. Jim Caldwell
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    Jim Caldwell Senior Member

    What outrunner has watercooled windings???
     
  6. BertKu
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    Location: South Africa Little Brak River

    BertKu Senior Member

    With an out-runner, the magnets are turning around the static coils. Therefore it is easier to place some pipes in the winding plates portion of the motor to cool the winding's. I cannot help you with makes and names. I myself was first considering to drill holes in one of my motors, but I am worried that I will short circuit the plates on which the winding's are wound. I dont have the equipment to stamp the plates and then isolate them. Bert

    P.s. Jim I googled for you. : Collossus 12kw outrunner liquid cooled!

    I personally have better experience with cooling the whole motor lot stock and barrel in transformer oil.

    There is a question raised over watercooled out runners : https://forums.offshoreelectrics.com/showthread.php?19027 Why are water cooled outrunners useless...

    Jim if you are questioning my language, my apology. I speak a number of foreign languages, but all badly. (watercooled windings instead of watercooled outrunner )
     
  7. Jim Caldwell
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    Jim Caldwell Senior Member

    Thanks Bert, that's been around for a while 2010. But water cooling was still experimental in 2014 and they were still having problems getting controllers to work!
     
  8. BertKu
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    BertKu Senior Member

    Hi Jim, what do you mean they still have problems to get the controller under control. Are they unable to cool the controller at 800 Ampere and blow them up all the time? I used the IRFP064N, 6 parallel x 6, but I did not more than 400 Ampere test and 36 Volt.But the Mosfets were cooled directly via a plate to the river water.
    48 + Volt and 400/800 Ampere is indeed quite a challenge. There are not too many MOSfets which can handle voltages greater than 70 - 80 Volt. I use only N type Mosfets and DC- DC inverters to the gate at the plus side. Bert
     
    Last edited: Apr 9, 2017
  9. BertKu
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    BertKu Senior Member

    Hi Jim , Actual I had a look at one of my outrunners and actual the windings are being cooled by the transformer oil directly and by the water indirectly. However I have never put one in a very large flower glass filled with transformer oil, so I could see whether during spinning the oil forms vacuum around the windings. I love to try that, so I could see how well the cooling take place. I am getting my daughter over from Jersey (UK) next week over the Easter period and thus my apology, she comes first. But maybe in 3 weeks I will try it, maybe make a video with my mobile phone and let you know the outcome. Bert
     
  10. Jim Caldwell
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    Jim Caldwell Senior Member

    Bert, I believe the Endless Sphere users were saying it had to do with the fact that it is a 10 pole single phase design at 144volts. That's over my head.
     

  11. BertKu
    Joined: May 2009
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    BertKu Senior Member

    Not very advisable to use 144 Volt on a small boat. Thanks for your reply. Bert
     
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