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  #31  
Old 04-03-2017, 01:53 PM
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feunatz feunatz is offline
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Hi BertKu, Thanks for the advice. My Frist post was a bit ago and with advice from some much more experienced members many aspects of my Project have changed.

Dual Motor is gone - Single 25KW(15KW) watercooled outruner - 800A Watercooled Controller
Drive will be somewhat similar to Irie's Surface Drive
DIY Electric Surface Drive
Hull: Bateau RB14
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  #32  
Old 04-03-2017, 03:00 PM
BertKu BertKu is offline
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Quote:
Originally Posted by feunatz View Post
Hi BertKu, Thanks for the advice. My Frist post was a bit ago and with advice from some much more experienced members many aspects of my Project have changed.

Dual Motor is gone - Single 25KW(15KW) watercooled outruner - 800A Watercooled Controller
Drive will be somewhat similar to Irie's Surface Drive
DIY Electric Surface Drive
Hull: Bateau RB14
Hi Feunatz, very interesting concept. should work well. I like out runners, special when the water cooling pumps through the windings. Good luck.
Bert
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  #33  
Old 04-07-2017, 11:42 AM
Irie Irie is offline
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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.
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  #34  
Old 04-07-2017, 12:42 PM
portacruise portacruise is offline
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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
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  #35  
Old 04-08-2017, 05:47 AM
Jim Caldwell Jim Caldwell is offline
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What outrunner has watercooled windings???
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  #36  
Old 04-08-2017, 08:39 AM
BertKu BertKu is offline
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Originally Posted by Jim Caldwell View Post
What outrunner has watercooled windings???
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...read.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 )
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  #37  
Old 04-09-2017, 06:29 AM
Jim Caldwell Jim Caldwell is offline
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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!
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  #38  
Old 04-09-2017, 12:02 PM
BertKu BertKu is offline
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Originally Posted by Jim Caldwell View Post
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!
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 by BertKu : 04-09-2017 at 02:59 PM. Reason: last sentence better formulated
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  #39  
Old 04-09-2017, 02:56 PM
BertKu BertKu is offline
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Quote:
Originally Posted by Jim Caldwell View Post
What outrunner has watercooled windings???
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
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  #40  
Old 04-10-2017, 05:53 AM
Jim Caldwell Jim Caldwell is offline
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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.
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  #41  
Old 04-10-2017, 12:22 PM
BertKu BertKu is offline
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Originally Posted by Jim Caldwell View Post
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.
Not very advisable to use 144 Volt on a small boat. Thanks for your reply. Bert
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