Propeller blade and pitch info please

Discussion in 'Electric Propulsion' started by user4301, Jul 23, 2018.

  1. user4301
    Joined: May 2018
    Posts: 1
    Likes: 0, Points: 1
    Location: little rock, ar, usa

    user4301 New Member

    I have 12VDC waterproof electric motor in tunnel, typically 100mm diameter.
    Shafts out both ends of motor.
    1 Should propellers either end of motor be same number of blades each end?
    2 Should propeller blades be same pitch each end?

    Application I think needs low speed, low power consumption.
    Device steering uses only different motor speed either side of device, i.e. water output from tunnel. Might be pcm don't know yet.

    I would appreciate links and guidance.

    Many thanks
    user430134@gmail.com
     
  2. gonzo
    Joined: Aug 2002
    Posts: 16,235
    Likes: 1,368, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Can you post a diagram with dimensions and shape of the setup?
     
  3. BlueBell
    Joined: May 2017
    Posts: 2,120
    Likes: 654, Points: 113
    Location: Victoria BC Canada

    BlueBell . . . . .

    1. Yes
    2. No, the following prop should be higher (more) pitch because it's advance speed is higher.

    But we need lots more information:
    Speed, purpose, weight, boat, etc, etc, etc...
    Pictures work well, diagrams, sketches, doodles even, anything really.
     

  4. gonzo
    Joined: Aug 2002
    Posts: 16,235
    Likes: 1,368, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    It depends on the geometry. If the diameter at the exit is larger, the velocity could be lower.
     
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