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An array of nozzles, from which jet high-pressure jets of liquid nitrogen, aimed so that with one discharge your garden grass, bowling green or sports field surface is frozen and, by force of the jets alone (possibly), harmlessly snapped at your preferred lawn length.
Laser Lawnmower
Laser Lawnmower
[zen_tom, Feb 08 2012]
If you can do it with hair, then why not grass?
freeze_2fbreak_20hair
[ldischler, Feb 09 2012]
[link]
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Excellent! [+] What could possibly go wrong? |
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(...here, kitty, kitty, kitty...") |
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I like the idea of a completely silent lawnmower |
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Me too - and liquid nitrogen would supply a suitably misty atmosphere for the laser-based lawn-invigilation system. |
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A lawnmower which made ice-cream would be welcome too - for those hot summer days. |
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I could be wrong but I don't think that the grass will be a ble to fix the nitrogen if its all liquid like that... |
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Would the grass recover from being frozen? Given its
high surface area/volume ratio, I would think it
would be frozen quite quickly (which would be
conducive to survival), but I don't know if it would
survive the process. |
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Your lawn would also have to be well-drained, so as
to allow the heavy nitrogen gas to run off and not
suffocate your plants. |
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//Wound the grass recover from being frozen?// |
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That's the whole point, we want to kill it off! Less grass, less &#%@* mowing. And it might be cheaper than keeping the whole yard paved over. |
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Your device could cut the sod into a strip, pick up the strip and roll it over, and dip the inverted portion into a tray of LN2 to the desired depth. As the sod passes the next set of rollers, the frozen tips would get broken off. Flip it over the rest of the way, and put it back down. |
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I have wondered what would happen if you dropped a big tank
of liquid nitrogen on a wild fire. Would the sudden drop in
temperature and massive blanket of nitrogen gas have a quelling
effect? |
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Baked already by Joni Mitchell (The Hissing of Summer Lawns) |
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Oh, [xenzag], now you've done it. I fought the lawn, and the lawn won. |
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Tenpole Tudor - "Swards of a thousand men" |
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//I fought the lawn, and the lawn won.// |
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Happens every summer here. Some days are just too, too hot. :-/ |
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Aqualawn my friend,
don't you verge away unfreezy.
You poor old sod, you see it's only me... |
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//You're not wrong but you've entirely missed the point.// |
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tss.
If you miss the point, none of the grass gets cut at all. |
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This liquid nitrogen's going to be describing a parabola. If you squirt it hard enough to make that parabola virtually flat over your lawn, then there's going to be quite a lot of overshoot, isn't there? |
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You calibrate volume so it vaporizes in the heat of the day before it gets much past your yard. As an added bonus, it gives the neighbors incentive to train their dog to stay well away from your yard, which reduces the number of piles you have to be careful not to step in. |
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//This liquid nitrogen's going to be describing a
parabola.// Actually, it's [pertinax] that's describing
a parabola. The solution is precision grading so the
grass grows on a perfectly parabolic hill. |
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