How much Weight do I need?
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- Опубликовано: 12 мар 2022
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Another great video with absolutely awesome information. Would love to see a video also about the model cars behind you!😊
You sir, are a great teacher. Thank you for this helpful content.
All makes sense to me… Thanks for another good video!
Awesome video, could you make a video about rubber or miflex hoses, you’ve mentioned one coming in some past videos.
I had a complete flooded drysuit twice. You get a little bit negative due to the loss of air that is trapped in the undersuit (if it is fully flooded). If you are weighted properly it is barely noticeable.
I had a fully flooded dry suit no long along. No issues with the buoyancy, as you said the water is obviously neutral, but it was hard to keep kicking normally (or to keep the knees bent) and really difficult to get back on the boat (no ladder, had to push up form the side....and the water inside do weight then)
Dude If i didn't say it already love the vids!
Had a neck seal go on a dry suit I borrowed off my instructor when doing some wreak training in about 25m of water. Did a 30 min dive in 14 degree C water. It did not effect my ability underwater at all. The hassle came when I needed to get back into the RIB. The suit was very heavy. Had water up to my mid thigh area!
Ein emotionales Thema anspruchsvoll und detailliert erklärt! Eigentlich gibt es einen Begriff für diesen sehr alten Themenblock: Balanced Rig. Ohne Vorkenntnisse kann es anspruchsvoll zu verstehen sein, sollte aber eigentlich der Beginn einer jeden Tauchausbilundg sein.
Well, the concept of Balanced Rig is a good one and shall be complied with. But it only looks at the question: Can I swim myself and the gear to the surface in case of a failure of all buoyancy devices?
It does not cover the question: Does my gear float itself at the surface?
@@frankvaldor7131 Yes agreed on that one. Maybe I had a more global understanding of the "balanced rig". In fact the more balanced Your RIG is the less lift capacity You need for Your BCD, making it more likely to not float at the surface. The surface floating is more like a "special need".
The way I look at it: a flooded drysuit simply no longer offsets any of the negative buoyancy of the rest of your gear. Conveniently, though, you already sized the wing to float your gear without the benefit of your buoyancy!
So, here is what I did. I acquired for free, twinset steel 120's. I also have a twinset AL100's. For the 100's I use a 60# wing that works great for that set up. When I tested the 120's in dive configuration using a 5-pound SS backplate I was surprised. These steel 120's are heavy btw. I dropped my the whole 120 kit in dive configuration in the water and the 60# wing almost let the kit sink. That gave me bad thoughts of going deep, losing buoyancy, and free-falling out of control to the bottom. That really bugged me. So I shopped online for a bigger wing, and I found one. The only thing I found bigger then 60#, was a Hollis 85# horseshoe wing. I do prefer a doughnut wing but there was none bigger then 60#. I dived the 85# off San Diego w/ a drysuit, down to 90' and no issues, and I believe I can take this set up down to 200-300' in the future.
If anyone has any comments please do.
You can just cut it short and think of the gear and diver with drysuit seperately: If the gear floats on it's own with a full wing there will be no problem even if your drysuit flooded and had no buoyancy at all any more, no matter how much buoyancy it had before. You just fill the same amount of gas lost from the suit in your wing and you're neutral again...
I made the mistake of not zipping up my dry suit. I was still buoyant on the surface. But getting out up the latter was very hard
Thats funny. LOL
lol I JUST did this a few days ago! I accidentally didn't zip my suit all the way and my legs were flooded. In the water, it doesn't do shit!! When I got out of the water though, it was hard/heavy to walk around :P
Dude, you guys need to fix your audio situation ok? I like these videos but I can barely hear them!
I have never flooded my Drysuit, but if it happens…it’s just water. Like you said. It doesn’t add weight.
I want to go to Norway in August, any place you can recommend for wreck diving? Since I am with family, it is supposed to be within recreational limits, and I will rent gear, 😉 so I can get rid of it, before I get back in the boat.
skottevik.no/en/diving/dykkesenteret/
My absolute favorite and a top place for the family as well.
@@CoastalDevelopment thank you, looks great! We will go there!
Well, it happen to me years back. I was using a borrow dry from a diving centre, and it has a broken neck seal what I figured out some time after descent. Water went in, funny enough my undersuit was Santi BZ 400 like on the example. What happened? Nothing I could control my boyancy all the time. I was just wet. And on a side note: I can recommend this undersuit because I didn't get cold ;)
I have the same and it’s worth every penny. Fingers and toes were the only cold bits
How would you handle the case if your bc was compromised and couldn't hold air?
Guess now we have tye topic for the next follow up 😉
@@CoastalDevelopment use your dsmb or liftbag, sticked in your harness, to get lift. Orally inflatable and you do not compromize your trim.
@@markusleitner3735 you'd hit an uncontrolled assent with that I think? Since you can't dump the gas and it expands
@@kylebr03 you can dump gas from a proper dsmb, because there is a valve to do so. You get trained to do so in your basic tech training. Have a look at your closed dsmb, you will figure out.
Thinking about the weight of air in your drysuit, 1kg of air is the equivalent of breathing through half a 12 litre cylinder. Or at the surface, that's 900 litres of gas. Now think about how much air is captured around your body and undersuit and how much more you put in to stay comfortable during a descent to say 30 metres: 3 or 4 short squirts? Even if you guess the total air in your suit is indeed 900 litres, or 225 litres at 30m, a total flood will deprive you of only 1kg of buoyancy. And 225 litres is the space required for another really big dude to be in there with you! I think the biggest problem with a flood is going to be hypothermia.
I don't think your reasoning is right. The question isn't how much mass does the air have (which contributes negative buoyancy), but how much water does it displace (which contributes positive buoyancy). When Achim suggests that replacing all the air in your dry suit results in losing 1-2 kg of positive buoyancy (at 12:00), that means you lost 1-2 liters of air (regardless of depth).
I think 1-2 liters sounds like too little to give you the buffer between your skin and the dry suit. An adult male has a surface area of around 1.9m^2 (according to WolframAlpha). If you give yourself a 1cm buffer all around your body, that would result in 19 liters of air in the suit. Granted, some of this volume is taken up by the undersuit, but that's a light and fluffy suit, it's job is to trap air. With 1-2 liters of air, your dry suit has to be about 1mm away from your skin everywhere.
So I think 1-2 liters is an under estimation, but of course 900/225 liters is way too much.
@@ndepal Of course you're right. It's the volume of air displaced. I found a trial here: ruclips.net/video/xSPi-67H51I/видео.html
This was in a pool and shallow and the human body itself is still positively buoyant down to about 5 metres but it's still interesting.
maybe a flooded drysuit adds weight based on undergarments being wet? I don't know, just that a friend almost drowned because he swam wearing two pair of shorts once, one pair was cotton linen type material and he was a weak swimmer, said his wet clothes were too heavy.
In a proper drysuit diving course you have a pool excercise how to deal with flooded suit. You realise that suit can always hold good amount of gas somewhere and float you.
I'm not convinced that suit has only 2-3 liters of gas inside. If you need 10 kg of lead to compensate the buoyancy of your undergarment, it means there's almost 10 liters of gas inside!
Bryan from Lake Hickory Scuba did a video on this a few months ago.
ruclips.net/video/xSPi-67H51I/видео.html
The conclusion was that there is no catastrophic failure getting a dry suit flooded.
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