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Why is there no helicoptor with a single rotor?

  1. Feb 11, 2007 #1
    All helicopters have two rotors. Some have both rotors on vertical axes but rotating in opposite directions, and the rest have one rotor on a horizontal axis perpendicular to the helicopter body at the tail. Why is a single rotor never used? :frown:
     
  2. jcsd
  3. Feb 11, 2007 #2

    cepheid

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    To prevent the helicopter from spinning in circles, I believe.
     
  4. Feb 11, 2007 #3
    i think i have to relate it to energy and momentum and all that great stuff....
     
  5. Feb 11, 2007 #4

    cepheid

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    okay. What physical quantity does the motor "impart" to the rotor? (Hint: it puts it into rotational motion right? So how is that measured as a "quantity?") If so, does an equal and opposite amount of this quantity get "imparted" back to the helicopter?
     
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