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Is there any other way?

Discussion in 'Electronic Design' started by ngdbud, Sep 24, 2005.

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  1. ngdbud

    ngdbud Guest

    Just a quick question. Are there any other methods of propulsin that
    come from electricity other than electromagnetic (like in motors), ion,
    or electrokinetic? None of them are incredibly effecient asfar as I
    know, except for those lego dacta motors. You hook up one motor to the
    other and spin one like a generator, the other will spin just about as
    fast. Close to 100% effeciency. Now how to make them bigger?
     
  2. Ian Stirling

    Ian Stirling Guest

    Electrostatic, photon drive, and a few others.
    Lego motors are not even close to 100%.
    Do the numbers (torque*RPM) and I'd be surprised if it hit 70%.
    Bigger motors do a lot better, up to very high 90%s.
    Why?
     
  3. http://www.hobbyspace.com/Links/LaunchPropulsion1.html

    --
    Dirk

    The Consensus:-
    The political party for the new millenium
    http://www.theconsensus.org
     
  4. ehsjr

    ehsjr Guest

    Be a bitch to find a parking space. :)

    Ed
     
  5. doug dwyer

    doug dwyer Guest

    A 1 acre field gathers sun energy over time and the horse yields the
    energy with low efficiency aided by the manual labour of one individual.
    Vast areas of land "over illuminated" could support panels with moisture
    conserved underneath for growing .
    Although by reciprocality It is not possible to focus a sun image with
    higher surface temp than the sun surface (a mirror) I believe it can be
    done if lenses of high refractive index are employed.
    Ignore demon email address.
     
  6. John Larkin

    John Larkin Guest

    That would look funny on the top of your Volvo.

    John
     
  7. I read in sci.electronics.design that John Larkin
    It would look even funnier underneath it!
     

  8. It wouldn't take much wind to put it there, either.
     
  9. Rich Grise

    Rich Grise Guest

    What, 6,000 C isn't enough? ;-)

    Cheers!
    Rich
     
  10. ngdbud

    ngdbud Guest

    Youre going to have to check my math, but I once calculated the amount
    of power generated by one acre of sun light (based on contradictory
    information) and It came out to near 8 megawatts
     
  11. John Larkin

    John Larkin Guest

    Use electrolysis to split water into hydrogen and oxygen, and use them
    to power a rocket. Don Lancaster can fill in the details.

    John
     
  12. The figure I once memorized was about 1kW/m^2 incident light
    power on Earth. I don't know if that was with the sun in the
    zenith (where the light has to penetrate the least thickness of
    atmosphere).

    That would come out as about 4MW/acre.

    robert
     
  13. Paul Burke

    Paul Burke Guest

    * cos( angle of sun).

    Paul Burke
     
  14. me

    me Guest

    blah, blah, blah...
    max power available x conversion efficiency = what you can do with it...
     
  15. ngdbud

    ngdbud Guest

    I must have multiplied wrong, that and I was going of 19 w/ft^2
    (information I got out of a kids book). 5280 ft. per mile 64 acres per
    mile^2, just tell me where I'm wrong. I wouldn't be suprised if none of
    this 5280 ft. to a mile was right. this is all based off stuff i
    learned in grade school and committed to memory (I am now 14 and a
    freshmen).
     
  16. No, 640.

    BTW, an acre is very close to 0.4 hectare, making a link with metric
    measures. This is because hidden in Imperial land measure is the rod,
    pole or perch of 5.5 yards, which is very close to 5 metres.
     
  17. Link? I think coincidence.

    along those "very close" lines:

    Liter = quart

    Yard = meter

    Inch = 2.5 cm

    Pound (mass) = 0.4 kilograms

    Mile = 1.6 kilometers, which means kilometer = 0.6 miles, which means there
    is some very close link to the golden ratio.
     
  18. I read in sci.electronics.design that Richard Henry <>
    Please read the words. 'Link' is in the first sentence. The explanation
    is in the second sentence and it is indeed a coincidence. The rod, pole
    or perch is a very old unit, whereas the metre was invented after the
    French Revolution and was intended to be one 40-millionth of the
    circumference of the Great Circle through Paris.
    US quart, not Imperial.
    No, 0.9 m
    No, 0.45 kg
    Coincidence again. See above for how the kilometre happened.
     
  19. Guest

    Guest Guest

    640 acres/sq.mi.

    Quick metric conversions:

    A meter is 10% longer than a yard
    A litre is 5% larger than a quart
    a kilogram is 10% heavier than 2 lbs.
    a hectare is 2.5 acres

    Notice that in every case the corresponding metric unit is larger than the
    English equivalent.

    Norm Strong
     
  20. Cattle prod?
     
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