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R/C solar-powered sail boat project

Discussion in 'Electronic Basics' started by John_Lee, Aug 8, 2004.

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  1. John_Lee

    John_Lee Guest

    I've just completed building a fairly long sail boat, a
    radio-controlled boat, which is to be powered by both batteries and
    solar panels, along with the help of the wind. I'd like to use
    separate flexible solar panels, they are extremely light in weight, to
    power one small DC fan and one bigger DC fan. Here are the
    specifications of those fans: small fan (Rated Voltage: 12VDC, Rated
    Power Current: 0.15 Amp, Rate Power Consumption: 1.8 W); big fan
    (Rated Voltage: 12VDC, Rated Power Current: 1.0 Amp, Rate Power
    Consumption: 12.5 W). These fans will be placed in a way that they
    blow air at the sails, thus propelling the boat. I would like to sail
    this boat for 5 hours non-stop.

    My question: based on the specifications of the fans, what are the
    sizes for the solar panels (in terms of Rate Power Consumption) for
    the small fan and the big fan? Thank you.

    John.
     
  2. Graham W

    Graham W Guest

    Don't be silly! How can that ever work? If you really want to use
    fans to propel the boat then they must exhaust freely directly rearwards.

    Forget about using the small fan. It has about 1/400 HP electrical
    input and virtually nothing in the way of thrust. I measured less than
    3 grammes (1/10 ounce) in a practical test.
    Then make sure your RC batteries are up to that service interval.
    I don't understand the question. You already have the info in the
    fan specs above.
     
  3. Rich Grise

    Rich Grise Guest

    John_Lee wrote:
    ....
    Visions of Wile E. Coyote are dancing in my head. ;-P

    Good Luck!
    Rich
     
  4. Dave Platt

    Dave Platt Guest

    #splorf#

    Beg pardon, but if you mean to do what I think you mean to do... it
    won't work. At best, you boat will just sit there, at worst it will
    actually travel backwards.
    Well, for what it's worth, most easily-available solar panels seem to
    require somewhat in excess of 1 square foot of panel space to deliver
    10 watts of power in direct bright sun. 2 square feet per 10 watts is
    probably a good figure to shoot for.

    However, unless you're planning to sail this boat in a circular path
    around some sort of "racetrack", and can mount the panels and fans on
    the "shore" to blow air forwards at an angle onto the boat as it sails
    by... I suggest you re-think your idea.

    The old trick of "person on boat holds fan, fan blows air on sails,
    sails push boat forwards" only works in cartoons. In real life,
    Newton's second law of motion prevents this from working.
     
  5. Dave VanHorn

    Dave VanHorn Guest

    Your sail should be a vertical cylinder, which you spin around it's vertical
    axis.
     
  6. Mark (UK)

    Mark (UK) Guest

    HAHAHA!! LOL!!!

    Reminds me of a Popeye cartoon, where Bluto is chasing after Popeye and
    Olive, who are on a ship - Popeye eats some spinach, then blows at the
    sails and the boat zooms off!! :)

    Seriously though, that Newton dude said that for every action, there is
    an equal and opposite reaction, so if the fan blows the sail, the boat
    will try to move forward, but the fan will also move backwards by the
    same amount, therefore making the boat go nowhere, or if the fan is
    powerful enough, rip the boat in half, then the front bit will go
    forward, and the back bit will go backwards - until it sinks!

    Yours, Mark.
     
  7. Gareth

    Gareth Guest

    That is true if the fan was blowing forwards directly onto a sail angled
    perpendicular to the direction of motion, but suppose you put the sail
    at 45 degrees to the desired direction of travel and positioned the fan
    at the side of the boat blowing perpendicular to the direction of
    travel. I think that would result in some forward force. It would be
    less efficient than just having the fan blow backwards with no sails,
    but would look more realistic as the sail would have wind in it. I
    assume that is what the OP wants.

    Gareth.

    --
     
  8. Consumption: 12.5 W). These fans will be placed in a way that they
    I'm reminded of the Good Ship Venus:

    The first mate's name was Carter
    He really was a farter
    When the wind wouldn't blow and the ship wouldn't go
    They got Carter the farter to start 'er.
     
  9. Take the power and apply it to an underwater fan.
     
  10. I don't think that means what you think it means.
    Will the sun be shining, or do you want battery power to take up the
    slack?
    Uh, 1.8 watts and 12.5 watts...
     
  11. Mark (UK)

    Mark (UK) Guest

    ROFLMAO :)
     
  12. Ah, right you are, I was confusing the output he needs with the solar
    panel ratings. Now that I think about it, mounting "angle" and
    shading are going to be nightmares.

    How about "as much as you can fit on the boat"? I suspect Rheilly
    Phoull's answer of an underwater fan is going to be your best bet...
     
  13. andy

    andy Guest

    actually not - the standard rating for solar panels is based on an
    illumination of 1kW/m^2, but actual sunlight will be less than this unless
    you live on the equator. the sheet i have says a 10 watt rated panel gives
    2.5 Ah/day at 12V on average in a UK summer, which should give some idea.
     
  14. Roger Gt

    Roger Gt Guest

    <William P.N. Smith> wrote in message
    : [I wrote]
    : >> Uh, 1.8 watts and 12.5 watts...
    :
    : >actually not - the standard rating for solar panels is based on
    an
    : >illumination of 1kW/m^2, but actual sunlight will be less
    :
    : Ah, right you are, I was confusing the output he needs with the
    solar
    : panel ratings. Now that I think about it, mounting "angle" and
    : shading are going to be nightmares.
    :
    : How about "as much as you can fit on the boat"? I suspect
    Rheilly
    : Phoull's answer of an underwater fan is going to be your best
    bet...
    :

    FYI -- Just so you know:

    An "Under water fan" is normally referred to as a "Wheel" on a
    boat.
     
  15. Nope, wheels aren't going to help. He's going to need to put a
    propeller on it.

    "Does anal-retentive have a hyphen?" 8*)
     
  16. Roger Gt

    Roger Gt Guest

    <William P.N. Smith> wrote
    : >An "Under water fan" is normally referred to as a "Wheel" on a
    : >boat.
    :
    : Nope, wheels aren't going to help. He's going to need to put a
    : propeller on it.
    :
    : "Does anal-retentive have a hyphen?" 8*)
    :

    I see you do not speak English, I intended to provide English
    speaking adults with information, so it was clearly not directed
    to B. S. (Little Billy Smith)!

    In answer to Mr. Smiths inane question, the answer is obvious by
    inspection, something you are clearly are unaware of, but should
    be able to see once it is pointed out to you!

    BTW, The horizontal wench used to control the rudder is a "Helm"
    not a wheel. A Propeller is a component, and when installed it is
    a "Wheel!"

    If we are to speak, let us be understood clearly and
    unambiguously!

    Trying to be funny works only if you ARE funny! Otherwise your
    just a SA!
     
  17. Ah, now I understand Roger. (Should I bother with the smileys? Naw,
    Roger Git doesn't git them...)
     
  18. Roger Gt

    Roger Gt Guest

    < B. S.> wrote
    : "Roger Gt" wrote
    : >Trying to be funny works only if you ARE funny!
    :
    : Ah, now I understand Roger. (Should I bother with the smileys?
    Naw,
    : Roger Git doesn't git them...)

    No, you Don't get it!
    Besides, your smiley sucked!
     
  19. keithdisco

    keithdisco Guest

    and
    the captins cat was called hall
    it only had 1 ball
    its fravorate trick was to stand on its dick and fly shit up the chart room
    wall
     
  20. keithdisco

    keithdisco Guest

    Twas on the good ship Venus,
    By Christ you should have seen us;
    The figurehead
    Was a nude in bed
    Sucking a dead man's penis. Alternatives

    Chorus:

    Frigging in the rigging,
    Wanking on the planking,
    Tossing on the crossing,
    There was ****-all else to do.

    The captain's name was Lugger.
    By Christ he was a bugger.
    He wasn't fit
    To shovel shit
    From one ship to another.
    The first mate's name was Carter.
    By God he was a farter.
    When the wind wouldn't blow,
    And the ship wouldn't go,
    Carter the farter was starter. The first mate's name was Carter.
    He was a champion farter
    He could fart anything
    from God Save the King
    To Beethoven's Moonlight Sonata.
    The second mate's name was Hopper.
    By God he had a whopper;
    Twice round the deck,
    Thrice round his neck,
    And up his arse for a stopper.
    The third mate's name was Breen
    he invented a wankin machine
    On the 99th stroke
    the friggin thing broke
    and whipped his balls to cream
    In the chart-room there was Andy,
    By Christ he had a dandy,
    Till they crushed his cock
    On a jagged rock
    For coming in the brandy.
    The bosun's name was Wear,
    He was a champion pee-er.
    He hosed the decks,
    He washed our necks,
    And made the captain's tea...er!
    The third mate's name was Morgan,
    By god he was a gorgon,
    From half past eight
    he played till late,
    Upon the captain's organ. The captain's name was Morgan,
    By Christ he was a gorgon.
    Ten times a day
    He'd stop and play
    With his fucking organ.
    The captain's wife was Mabel,
    And by God was she able
    To give the crew
    Their daily screw
    Upon the galley table.
    The captain's daughter Charlotte,
    Was born and bred a harlot,
    Her thighs at night
    were lily white,
    By morning they were scarlet.
    Another daughter, Betty
    To screw was always ready
    She'd fornicate
    Withthe second mate
    And suck-off his bunkmate, Teddy
    The cabin boy was Kipper,
    By Christ he was a nipper.
    He stuffed his arse
    with broken glass
    And circumcised the skipper.

    The cabin boy's name was Davy,
    We stole him from the navy
    And sat his bum
    In boiling rum
    For pissing in the gravy.
    The captain's lovely daughter
    Liked swimming in the water.
    Delighted squeals
    Came when some eels
    Swam into her sexual quarters.
    The captain's daughter, Mabel,
    Though young, was fresh and able,
    To fornicate
    with the second mate,
    Upon the chartroom table.
    The cook his name was Freeman,
    He was a dirty demon,
    He fed the crew
    On menstral stew
    And hymens fried in semen.
    The chinese cook was Chang
    By christ had he a wang.
    To ring the bell
    and raise some hell
    He used his wang to clang

    The ship's dog's name was Rover,
    We turned that poor thing over,
    And ground and ground
    that faithful hound
    From Tenerife to Dover.
    The ship's cat's name was Kitty,
    Her arse was black and shitty.
    Her little twot
    Was piping hot
    From a crew who knew no pitty
    And when we reached our station,
    Through skillful navigation,
    The ship got sunk
    in a wave of spunk,
    From too much fornication. Twas on the China Station,
    They won their first citation,
    They sunk a junk
    In a sea of spunk,
    By mutual masturbation
     
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