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This system would rely on a sliding flotation
device to keep the top upright, but it would
let you decend much farther than that puny
footlong breather. It would be a dual-
chambered valve-action tube: exhale
through one tube, inhale through the other,
as CO2 would fill the chamber were it
to be
one tube. See illustration.
[This idea has been modified from a "Six-
foot snorkel" to the "Extra Long
Snorkel" to avoid any health issues.]
Illustration
http://hennesseydes...xtralongsnorkel.jpg
X-tra Long Snorkel Illustration [ophello, Sep 27 2005, last modified Jan 09 2010]
(??) Snorkel Science
http://www.absolute...ia/s/sn/snorkel.htm
From the article: "The maximum length of the tube is around 50 cm / 18 inches. A longer tube would place the lungs in deeper water where the surrounding water pressure is higher and the lungs would be unable to inflate when the diver inhales, because the muscles that expand the lungs are not strong enough to operate against the higher pressure." [jurist, Sep 28 2005]
[link]
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Make the snorkel so that you have to blow out hard. Then use the pressure of the blowing to pre-pressurise the incoming air. Solves the pressure differential between the water and the ambient air to an extent. |
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With the shorter version, this won't be as
much of a problem (I hope). |
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It's wonderful to see illustrations of that caliber, [ophello], but this idea didn't work out for Billy Green and me when we tried testing our first submarine in Layton's pond when we were nine. The boat submerged spectacularly, exactly as designed, but our snorkel tube helmets made from galvanized buckets and vacuum cleaner extendible hose attached to an overhead inflated innertube left us gasping for air. [see link for science] Billy swallowed so much pond water that he was sick for a week and I'm pretty sure the old rowboat is still on the bottom of the pond. Mrs. Green didn't let me play with Billy much after that adventure. |
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I would still advocate for the longest
snorkel safely possible. The one-foot
version we have seems arbitrary. |
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For every foot of water above your lungs, there is .433 lbs of pressure per square inch. After you go about five feet down, the pressure is so great, you simply can not inhale. Believe me, I've tried this idea and found out the hard way...so I did a little scientific investigation on why I could not breath through a perfectly good hose to the surface. So, I hooked up my Mom's vacuum cleaner exhaust to the hose and tried again. Was able to breath at the bottom at about six foot level, but not very well...vacuum cleaners don't produce very many pounds of pressure. So, my next try was with a bucket I soldered a fitting to and hooked up my Dad's air compresser to it..put my head in the bucket and ...presto, I was a diver at the deepest part of the pool (8') with no problems. But, the bucket kept trying to float me to the surface...so I tied two heavy concret bricks to my feet and strapped the bucket on my head...as I got to the point where water just covered the bucket (and my head) the bucket slipped off and I was anchored to the bottom of the pool and could not quickly get back to shallower water...I managed to slip my feet from the blocks and scramble to the surface just before drowning...so I quit my experiments in any environment that is devoid of natural iar...I've lived just fine so far. |
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Is there any risk of tearing something loose if you try REALLY HARD to inhale through a tube at deeper depths? I'd hate to go experimenting and collapse a lung or tear my diaphragm... That'd be almost as bad as tying bricks to one's feet! |
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[Navy], [longshot], you’re toying with the possibility of ruptured alveoli. |
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The problem with this snorkel is that you can’t go under. Suppose you want to play with the interesting sea creature (nice drawing) and it’s 15’ down? |
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//so I tied two heavy concrete bricks to my feet and strapped the bucket on my head//
I'm still laughing. |
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Would it work if there was a pair of waders with a long rigid vertical transparent tube into which you inserted your body? That way, your head and torso would be outside the water and close to sea level pressure but you could stick your limbs into sleeves and trousers to do stuff underwater, and you could see. The tube could be buoyant at the top. |
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There is a risk of collapsing your lungs, or at least there was when I took physics 101. Perhaps times have changed. |
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