21–30 of 94 posts
https://www.chinadaily.com.cn/travel/2012-11/15/content_1593...
"Sheepskin rafts can be traced back to the Han Dynasty (206 BC-AD 220), when soldiers used them to ferry men and goods during wars. Local residents in Lanzhou used them to shuttle passengers, fresh fruits and vegetables across the river."
Sheepskin raft becomes popular for tourists to sightsee along Yellow River in Gansu
http://www.xinhuanet.com/english/2019-05/31/c_138105617_9.ht...
Earlier quoted context omitted.
Additionally, a bag of air of that volume would not give much time underwater - maybe an extra breath or two. The extra effort and drag of carrying the bag would make it less effective than just diving. A modern steel SCUBA tank is typically pressurized to 200 bar, or about 3000 psi, making it 200x more useful than a bag. An inflatable ball is only inflated to about 0.5 bar/8 psig, human lungs are only capable of abo…
Swimming was quite common in ancient Mediterranean area societies. They even did a lot of breath hold free diving, hunting for sponges and shellfish. Modern swimmers probably are better than anyone in history. An optimal front crawl stroke technique isn't intuitively obvious at all. There have been significant improvements just in the last few decades. https://en.wikipedia.org/wiki/Front_crawl#History?wprov=sfla...
I think it's interesting that he's shown swimming mostly nude but wearing a protruding hat which seems pretty impractical. Is the hat symbolic?
I think it's interesting that he's shown swimming mostly nude but wearing a protruding hat which seems pretty impractical. Is the hat symbolic?
Earlier quoted context omitted.
None of that is even close to correct. Are you a scuba diver?
Not regularly and only very shallow so my recall of the details isn’t great. But I do recall asking about even slower breathing and the response was it extracted more oxygen but wasn’t recommended due to the risks of disorientation. I think the 2x was in relation to failing to do slow deep breathing though. As a sanity check 6l of air per minute x 5minutes is 30l which is about the size of your torso. Assuming that b…
Earlier quoted context omitted.
None of that is even close to correct. Are you a scuba diver?
Not regularly and only very shallow so my recall of the details isn’t great. But I do recall asking about even slower breathing and the response was it extracted more oxygen but wasn’t recommended due to the risks of disorientation. I think the 2x was in relation to failing to do slow deep breathing though. As a sanity check 6l of air per minute x 5minutes is 30l which is about the size of your torso. Assuming that b…
https://www.navsea.navy.mil/Home/SUPSALV/00C3-Diving/Diving-...
You cannot dive with an inflated goatskin, unless you carry extra weight, like stones.
Earlier quoted context omitted.
Not regularly and only very shallow so my recall of the details isn’t great. But I do recall asking about even slower breathing and the response was it extracted more oxygen but wasn’t recommended due to the risks of disorientation. I think the 2x was in relation to failing to do slow deep breathing though. As a sanity check 6l of air per minute x 5minutes is 30l which is about the size of your torso. Assuming that b…
That's about the size of my torso, but I'm fat as hell. I suspect the average ancient swimming warrior was in better shape.
Edit: “47% trunk and neck” so 40% torso would be 75kg and 165lb seems reasonable as a smaller person would also need less air.
He's swimming on the surface. That bag would be too buoyant for diving.
Additionally, a bag of air of that volume would not give much time underwater - maybe an extra breath or two. The extra effort and drag of carrying the bag would make it less effective than just diving. A modern steel SCUBA tank is typically pressurized to 200 bar, or about 3000 psi, making it 200x more useful than a bag. An inflatable ball is only inflated to about 0.5 bar/8 psig, human lungs are only capable of abo…