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  1. #31
    Senior Member Just Jeff's Avatar
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    Here's an issue - your body weight isn't distributed evenly in the hammock, so the head support probably has a slightly higher force than the foot support. Not only that, but the sine is based on a triangle...and since the weight isn't evenly distributed, the force vectors of the head and foot won't equal the angle between the plumb bob and support.

    But it'll be close enough for our purposes.
    “Republics are created by the virtue, public spirit, and intelligence of the citizens. They fall when the wise are banished from the public councils because they dare to be honest, and the profligate are rewarded because they flatter the people, in order to betray them.” ~Judge Joseph Story

    - My site: http://www.tothewoods.net/
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    IMPOSSIBLE JUST TAKES LONGER

  2. #32
    Senior Member blackbishop351's Avatar
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    Quote Originally Posted by Just Jeff View Post
    Here's an issue - your body weight isn't distributed evenly in the hammock, so the head support probably has a slightly higher force than the foot support. Not only that, but the sine is based on a triangle...and since the weight isn't evenly distributed, the force vectors of the head and foot won't equal the angle between the plumb bob and support.

    But it'll be close enough for our purposes.
    My guess is, all other things equal, the head end will actually sag more when you're in the hammock, due to your weight distribution and the supports stretching some. If that's the case, the distribution would show up in the angles - you'd just have to measure them at both ends.
    "Physics is the only true science. All else is stamp collecting." - J. J. Thompson

  3. #33
    Senior Member Just Jeff's Avatar
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    Good point - and yet another variable to account for...this is why theory rarely matches reality!
    “Republics are created by the virtue, public spirit, and intelligence of the citizens. They fall when the wise are banished from the public councils because they dare to be honest, and the profligate are rewarded because they flatter the people, in order to betray them.” ~Judge Joseph Story

    - My site: http://www.tothewoods.net/
    - Designer, Jeff's Gear Hammock / Pack Cover by JRB

    IMPOSSIBLE JUST TAKES LONGER

  4. #34
    I talked to the guys at weight test today, they are willing to let me use one of the dyno's for a real test, (all of there dyno's are calibarated) I'll take pictures of the dyno test with a body in the hammock, both ways (head end/feet end) and try to post before the weekend. I'll put a angle indicator or the line so we will know the angle of the dangle.

    I'll be using my old HH(non asym) for the test, with lines equal hights(level).

    Is there any thing else you can think of for this test?

    I am not willing to do the knot test with my HH, but if there is any one out there who is willing or really wants to know, I do work where the test could be done(after normal working hours of course)

    Sandy B

  5. #35
    Senior Member Bird Dog's Avatar
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    Man you guys are so scientific.......my way is much easier..

    1 - tie hammock as you normally would
    2 - flop into hammock as you normally would
    3 - if you fall on your back, your support is not strong enough
    4 - if you dont fall, your good to go

    P. S. - BB, 2L water bottles? How about, uhm, lets see....oooh, I know, MagLites!

    BD
    Just Jeff made me do it

  6. #36
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    That works to, but then again some of us hang in places you do not want to fall from. Mine are survivable with only wet gear and surface wounds. But hey who wants to fall into the creek in the middle of the night or down the hill.
    Is that too much to ask? Girls with frikkin' lasers on their heads?
    The hanger formly known as "hammock engineer".

  7. #37
    Senior Member blackbishop351's Avatar
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    Quote Originally Posted by Bird Dog View Post
    Man you guys are so scientific.......my way is much easier..

    1 - tie hammock as you normally would
    2 - flop into hammock as you normally would
    3 - if you fall on your back, your support is not strong enough
    4 - if you dont fall, your good to go
    That sounds like my usual testing method... HE must've given me engineering cooties from so much gear talk!

    Quote Originally Posted by Bird Dog View Post
    P. S. - BB, 2L water bottles? How about, uhm, lets see....oooh, I know, MagLites!

    BD
    We weren't planning on encountering your kind of 'clientele' during our test, BD!
    "Physics is the only true science. All else is stamp collecting." - J. J. Thompson

  8. #38
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    Quote Originally Posted by Bird Dog View Post
    Man you guys are so scientific.......my way is much easier..

    1 - tie hammock as you normally would
    2 - flop into hammock as you normally would
    3 - if you fall on your back, your support is not strong enough
    4 - if you dont fall, your good to go

    P. S. - BB, 2L water bottles? How about, uhm, lets see....oooh, I know, MagLites!

    BD
    #3 doesn't work for me. Plus having hard scientific data would be neat. It's always funny how theory and field tests differ.

    Thats why I liked music in college. Music theory is derived from practice. So music theory is very pragmatic unlike theory in other fields.

  9. #39
    Senior Member Bird Dog's Avatar
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    My theory is I am waaaaaaaaaaaayyyy out of my league talking science with you guys, but I enjoy listening to your discussions. And BB, Ill take a maglite over a water bottle any day. The possibilities are limitless. If worse came to worse, you could take the end cap off, remove the batteries, and make the maglite a water bottle. Im thinking it would be a great piece of survival gear. Better than having Chuck with you in a survival situation. Yea, thats right Jeff. I said BETTER THAN CHUCK. BD
    Just Jeff made me do it

  10. #40
    Senior Member blackbishop351's Avatar
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    Quote Originally Posted by Bird Dog View Post
    Better than having Chuck with you in a survival situation. Yea, thats right Jeff. I said BETTER THAN CHUCK. BD
    I'm not a big fan of Chuck as far as martial arts go, but I think I'd rather have him than a maglite in a survival situation. Why? Because if nothing else I could make him carry my gear if I broke a leg or something!
    "Physics is the only true science. All else is stamp collecting." - J. J. Thompson

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