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Thread: Can someone explain the prop size numbers?

  1. #1
    john50049
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    Can someone explain the prop size numbers?

    When you say for example and 8 4 prop what do the two numbers mean?
    Thanks
    John

  2. #2
    Legendary Member 65l88's Avatar
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    Re: Can someone explain the prop size numbers?

    The 8 is the diameter of the prop in inches and the 4 is the pitch of the blades. In other words, if a prop with a pitch of 4 was rotating through a solid medium, it would move forward 4 inches in one revolution.
    Marty



    Trex 500 flybarless, Tarot 450 Pro Flybarless, EXI 450 v3, Trex 250 Flybarless, HBFP X 2, Blade CX2, Blade 120 SR, Blade mSR X 2, Blade mCX2 X2, mCPXv1 brushless C05m, mCPX brushless HP05s, mCPX v2 stock

  3. #3
    Diamond Member Wingman Jeff 1's Avatar
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    Re: Can someone explain the prop size numbers?

    Thanks Marty ! I brought that up before and got a lot of people debating it, but you and I know that it is true. If the plane is set up right and has a 10 x 7, prop one full revolution of the prop will pull the planes 7 inches forward . You are the only person that I have ever met that agrees with this !

  4. #4
    Official Member
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    Re: Can someone explain the prop size numbers?

    I agree too, it's the same thing with boat props.
    Current fleet:<br />- Airfield 55&quot; Sky Trainer with flaps (in the hangar for major hoverhaul)

  5. #5
    john50049
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    Re: Can someone explain the prop size numbers?

    Thanks for the info.
    John

  6. #6
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    Re: Can someone explain the prop size numbers?

    i concur.

    bully

  7. #7
    Diamond Member Wingman Jeff 1's Avatar
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    Re: Can someone explain the prop size numbers?


  8. #8
    Super Moderator dfarmercse's Avatar
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    Re: Can someone explain the prop size numbers?

    If you go to h obbyking and look up any prop they show the tech data. Jeff is spot on.

    Dave F
    Farmer's Flying Service

  9. #9
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    Re: Can someone explain the prop size numbers?

    I got to say. this is true. Unless your motor is set to run backwards. then we slip into the twilight zone and the opposite is true. sorry guy's just had to do it.
    Happy flying.

  10. #10
    Super Moderator dfarmercse's Avatar
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    Re: Can someone explain the prop size numbers?

    Quote Originally Posted by sootydave
    I got to say. this is true. Unless your motor is set to run backwards. then we slip into the twilight zone and the opposite is true. sorry guy's just had to do it.
    Happy flying.
    That is like when I put the batteries backward in my flashlight. It cast a shadow.

    Dave F
    Farmer's Flying Service

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