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  1. #1
    Join Date
    Aug 2007
    Posts
    50

    Default Gear ratio help please

    Turned the front coupling 10 revolution-back coupling turned 4 plus 295 degree revolution (presume this is ahead- both coupling go same direction)
    Turn front 10 revolution and back coupling does 4 revolutions plus 235 degrees. What is the gear ratio please (its a Droffin gearbox)

  2. #2
    Join Date
    Aug 2008
    Posts
    2,696

    Default

    I make that 2.075:1 forward and 2.15:1 reverse.

  3. #3
    Join Date
    Dec 2002
    Posts
    2,933

    Default

    Quote Originally Posted by vic008 View Post
    Turned the front coupling 10 revolution-back coupling turned 4 plus 295 degree revolution (presume this is ahead- both coupling go same direction)
    Turn front 10 revolution and back coupling does 4 revolutions plus 235 degrees. What is the gear ratio please (its a Droffin gearbox)
    10 revolutions in = 3600
    4 revolutions +295 out = 1735
    Ratio = 3600/1735 = 2.075.

    10 revolutions in = 3600
    4 revolutions + 235 = 1675
    Ration = 3600/1675 = 2.15.

    I think
    I'd rather be naked
    www.mastaclimba.com

  4. #4
    macd is offline Registered User
    Location : Bricks & mortar: IoM. Me & boat: Turkey
    Join Date
    Jan 2004
    Posts
    4,110

    Default

    2.07:1
    2.15:1

    PS Woops...beaten to it. But it seems pretty unanimous.
    Mac

  5. #5
    Join Date
    Aug 2008
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    2,696

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    Shock - unanimity breaks out on ybw forum!

    Oops nearly anyway now 3rd post appeared.

  6. #6
    macd is offline Registered User
    Location : Bricks & mortar: IoM. Me & boat: Turkey
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    Jan 2004
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    4,110

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    Quote Originally Posted by Troubadour View Post
    Shock - unanimity breaks out on ybw forum!

    Oops nearly anyway now 3rd post appeared.

    But if Rocna made gearboxes...

    (3rd post in complete agreement...just don't see why anyone would need ratios to three decimal places.)
    Mac

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