h a l f b a k e r y"My only concern is that it wouldn't work, which I see as a problem."
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Silk armor
silk armored tank, silk armored soldiers | |
see link about the Samurai Horo cloak.
This one would be held in place with a lightweight collapsible
structure or kept open with a fan
horo
https://www.youtube...watch?v=8B_6BU7SYf8
[pashute, Oct 12 2014]
Spaced Armor
http://en.wikipedia.../wiki/Spaced_armour
[MechE, Oct 14 2014]
Slat Armour
http://en.wikipedia.org/wiki/Slat_armor
Similar to Spaced Armour, but more akin to the horo - could additionally be wrapped in silk, nylon or other material. [zen_tom, Oct 15 2014]
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AND Zip tie armor for the spear carriers and camp followers ? |
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My inflatable flailing tube army should be unstoppable. |
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Isn't this essentially the theory behind spaced tank
armor? The one that is designed to prevent shaped
charges or HEAT type rounds from penetrating the
main armor? |
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However, since an anti-tank round is quite a bit
heavier than armor, it needs a bit more than a layer
of silk, to provide the extra barrier. |
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According to the "horo" video and to a mythbusters episode
that I was not able to find and link to, but have seen some
years ago, the flexible silk is able to deflect and diffuse the
kinetic
energy along its "web" in the end even stopping bullets at full
speed. |
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I doubt very much that a horo would stop a bullet. |
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The horo works by a very subtle combination of yield
and resistance. When hit by an arrow, it moves quite
a bit, but its movement is resisted by the air.
Because of this, it provides a moderate stopping
force over quite a long (a few tens of cm) distance,
absorbing a lot of the arrow's kinetic energy. |
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If it's hit by a bullet, the velocity means that the horo
will not move very much (ie, air resistance will be
much too high at bullet velocities) - it will
behave very much as if were stretched taut over a
rigid frame. Consequently, the bullet will go through
the horo without significantly moving it, and without
itself being slowed significantly. |
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A great big Kevlar Zorb around the tank. |
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A very fine net, much coarser weave than silk, made out of
CNT. The bigger holes should mean very much less air
resistance... or inertia actually... it needs to stand up to
being able to accelerate up to bullet speed very fast. |
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I wouldn't begin to know how to calculate the acceleration
forces in such a system. |
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You still need a good amount of inertia for it to work. |
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Consider: the bullet hits the net at (say) 500m/s. You
want it to be decelerated by at least 50% (say) before it
makes contact with you. The distance over which it can
be decelerated (between the horo and your torso) is, say,
10cm. |
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The gives the horo about 0.3ms in which to decelerate
the bullet by 250m/s - that's a deceleration of roughly 1
million m/s/s. Assuming that the bullet has a mass of 20
grams, that means that the horo has to apply a force of
about 20,000 Newtons (about a tonne) throughout that
0.3ms. |
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[MBs] conclusions are reasonable. |
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An arrow has approximately an order of magnitude less
velocity than a bullet, despite the bullet weighing around
half as much. Therefore KE is approximately 50x less,
and the horo doesn't have to do anywhere near as much
work against the arrow. |
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And please note this is being generous on the arrow
velocity (basing it on a modern compound with
lightweight arrows). You go to a wooden straight bow,
traditional arrows (as shown in the video) and you're
probably looking at a much wider difference, since the
bow designs are lower speed, and the heavier arrows will
produce a lower velocity anyway. |
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//[MBs] conclusions are reasonable. // |
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That is probably the first time in the history of the
universe that that sentence has been written in
earnest. |
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I think this was a device of its own time only...back in those days, talking about muskets. So, lower velocity and wider cross-sections, not to be mention being blunt. |
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I do seem to remember silk armour working on musket balls, if the silk was very tightly wrapped around the body, as it turned the direction of force from the usual A to B (with A being the musket barrel, and B being somewhere in the back of the torso) to something like 90 degrees to the path A->B. |
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Not enough fool-proof, and would have hurt like hell to get shot though. |
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Hearsay, no actual historical source, is that silk was
popular for protection against arrows, especially war
points (barbed). It wouldn't prevent the wounds, but
since the silk didn't tear, it wrapped around the head and
allowed it to pull right back out. |
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As far as the tight wrapped silk, I could see it providing
some protection, but you're still going to feel the entire
force, it's just going to spread over a bit larger area.
Musket balls still had a lot of KE, so it probably wouldn't
work at close range, but it might have helped against
longer shots, or richochets or such. |
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