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  1. 02-19-2013, 06:41 PM #1
    MichaelXYZ
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    Default Ladder Gin Max MA question

    When using a ladder gin, what is the recommended MA? I was told 2:1, but have also heard 3:1 is acceptable. Also, considering vector forces, is it the same as tripod?

    Name: ladderginrig.jpg Views: 409 Size: 20.2 KB
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  2. 02-20-2013, 08:54 PM #2
    servantleader
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    Ok, I'll take a nibble and risk getting caught: Why would there an MA issue here?

    There's an old thread "Aerial ladder as High Directional or Crane" on page 2 of this forum. Check out my post to the thread on 05-02-2011 with an attachment. The results in the attachment show that the force exerted on the tip of the ladder actually decreases with increasing MA.

    Please email (davey@cwmr.org) me if you have questions.
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  3. 02-21-2013, 08:07 PM #3
    MichaelXYZ
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    By heck your right. I feel silly now for asking, I should do my homework before posting
    Thanks for correcting me.

    Frictionless system.

    Name: mechadvantage.jpg Views: 171 Size: 25.4 KB
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  4. 02-21-2013, 10:20 PM #4
    Rescue 2 Training
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    FYI, your 4:1 is actually a 5:1
    I used to be DCFDRescue 2. Forum changover locked me out.

    www.rescue2training.com
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  5. 02-21-2013, 11:33 PM #5
    MichaelXYZ
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    I'm gonna crawl under a rock now...

    Corrected drawing:
    Attached Images Attached Images  
    Last edited by MichaelXYZ; 02-22-2013 at 12:02 AM.
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  6. 02-22-2013, 12:03 AM #6
    MichaelXYZ
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    More clear images...

    Name: mechA1.jpg Views: 164 Size: 19.6 KBName: MechA2.jpg Views: 172 Size: 17.6 KB
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  7. 02-22-2013, 05:48 PM #7
    servantleader
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    Quote Originally Posted by MichaelXYZ View Post
    I'm gonna crawl under a rock now...
    It's all good...
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  8. 03-14-2013, 07:43 PM #8
    MichaelXYZ
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    I thought I should finish off this tread with tying off the guy lines of the ladder gin, this is how we do it.

    Name: laddergin-setup.jpg Views: 94 Size: 22.8 KB
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  9. 03-14-2013, 10:21 PM #9
    Rescue Dave
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    Why tandem prusiks? Why not just one?
    Dave
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  10. 03-15-2013, 01:06 AM #10
    MichaelXYZ
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    Tandems are not needed, not sure why I used em in the drawing. Brain fart maybe.

    I tried to upload a corrected image, but I have seemed to have exceeded my image quota...
    Last edited by MichaelXYZ; 03-15-2013 at 01:25 AM.
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