Electric Motor Questions

Discussion in 'Functional Gear & Equipment' started by birddseedd, May 31, 2016.


  1. techsar

    techsar Monkey+++

    Another factor to keep in mind is that water is going to offer a lot more resistance to motion than a car or truck will experience...
     
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  2. birddseedd

    birddseedd Monkey

    200sqft of panels isn't all that much space.
     
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  3. techsar

    techsar Monkey+++

    2000 - used motor (40horse)
    6500 - 26 250 watt solar panels (cheap ones!)
    10,000 - 100 group 27 batteries
    + charge controllers, mounting hardware, motor controller, cabling...and soon $30,000 is looking like a bargain.
     
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  4. ghrit

    ghrit Bad company Administrator Founding Member

    Oh, yes, it's called chlorine. Deadly, forms acid with the moisture in your lungs and directly you have no more lungs.
     
    Last edited: Jun 1, 2016
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  5. techsar

    techsar Monkey+++

    Ya know, I really hate shooting down the idea, but when you crunch the numbers, even loosely, it's not so good an idea....sorry :(
     
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  6. BTPost

    BTPost Stumpy Old Fart Snow Monkey Moderator

    One other thing that you MUST understand is the Coupling Efficency of your expended Motion Energy, in to the medium of transport... For Vehicle on ground, with wheels, the Coupling Efficency ig very HIGH.... For a vessel, in water, using a propeller, the Efficency is realitively LOW..... Also the medium t hat surrounds the two is totally different, water vs air resistance.
     
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  7. kellory

    kellory An unemployed Jester, is nobody's fool. Banned

    Solar Sailor Holdings - Wikipedia, the free encyclopedia
    Theses are not a pipe dream, they are active ferries.
    These are hybrids, and computer/ hydraulic controlled. Adds @40 fuel efficiency.
    There was a documentary a few years ago, featuring a huge solar only ship, but it was flat topped, and about the size of a football field.
     
    Last edited: May 31, 2016
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  8. birddseedd

    birddseedd Monkey

    They seem to be carrying a lot more weight than what i'm expecting. 180 people vs 4.
     
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  9. kellory

    kellory An unemployed Jester, is nobody's fool. Banned

    They are also riding the very top edge of efficiency. And using the finest material available. And it is still a hybrid.
     
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  10. birddseedd

    birddseedd Monkey

    my hull will not be as efficient as theirs for sure. but much smaller.

    I could just go slow, lol
     
  11. kellory

    kellory An unemployed Jester, is nobody's fool. Banned

    You will be slow, but you may also be at the mercy of the wind, like a woodchip on the water.
     
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  12. birddseedd

    birddseedd Monkey

    wind turbines for more power :D
     
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  13. kellory

    kellory An unemployed Jester, is nobody's fool. Banned

    No sir, more sail area, to push you off course.[deadhorse]
     
  14. birddseedd

    birddseedd Monkey

    I was thinking mainly to lift up at night to gather energy, wouldn't work while in motion.
     
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  15. kellory

    kellory An unemployed Jester, is nobody's fool. Banned

    I've read of another method, that uses water currents to charge batteries of an anchored boat. But none of these methods is very efficient, and none of them are cheap. Being green is not cheap, or everyone would do it.
    Good luck sir, but i doubt the game is worth the candle.
     
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  16. birddseedd

    birddseedd Monkey

    doesn't seem like its all that worth it. maybe on a bigger, more efficient and physically larger boat.
     
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  17. duane

    duane Monkey+++

    Don't know all the modern facts, but my uncle was on the old Saratoga during WW II and as a kid I heard him say that a 250 hp tug could move it at about 3 knots in no wind, but doing 30 knots they used about 250,000 hp. Don't remember all the details, but he said that for a displacement hull. there was a reason for that huge bow wave and beautiful wake and waves the hull created and all of the energy used to create them had to come from somewhere. What power would be needed to move the houseboat at 4 to 5 mph? Used to ride in 20 foot boats with 5 hp Evinrudes as a kid and they did very well at 5 to 6 mph.
     
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  18. Tempstar

    Tempstar Praeclarum Site Supporter+

    The Manatee Center in Homosassa Springs, FL has a pontoon boat with an electric outboard to ferry visitors. Seems I remember it having about 2 dozen batteries. They ran it about 10 minutes to the habitat, then back after an hour where it was plugged in until the next group was ready. It made me think about putting a golf cart motor on an outboard (minus the engine).
     
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  19. UncleMorgan

    UncleMorgan I eat vegetables. My friends are not vegetables.

    From the get-go, an electric-only boat is an invitation to disaster. Out on the open ocean, you can run into a week of bad weather without even half-trying. Weather where the engine has to keep running 24-7 if you want to keep the boat right side up.

    And as sure as God made fish relatively waterproof, even a houseboat can run into rough weather--and with it's large "sail area" even a modest breeze can put one twenty miles off-shore when a little coastal cruise was all the skipper had in mind.

    Internal combustion engines offer a tremendous power density in the fuel tank, and dependable operation for weeks at a time.

    On the water, it's best to stick with well-tested, rugged, and dependable equipment.

    It will definitely help keep your lungs above the water.
     
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  20. Tully Mars

    Tully Mars Metal weldin' monkey

    Exactly, just look at what happened to the SS Minnow...
     
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