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  1. #1
    Join Date
    Aug 2007
    Location
    CHCH. NZ
    Posts
    66

    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
    Location
    Brighton
    Posts
    3,074

    Default

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

  3. #3
    Join Date
    Dec 2002
    Location
    Gloucestershire
    Posts
    3,266

    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
    Join Date
    Jan 2004
    Location
    Bricks & mortar: IoM. Me & boat: Aegean
    Posts
    5,225

    Default

    2.07:1
    2.15:1

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

  5. #5
    Join Date
    Aug 2008
    Location
    Brighton
    Posts
    3,074

    Default

    Shock - unanimity breaks out on ybw forum!

    Oops nearly anyway now 3rd post appeared.

  6. #6
    Join Date
    Jan 2004
    Location
    Bricks & mortar: IoM. Me & boat: Aegean
    Posts
    5,225

    Default

    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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