Channel Questions Part 3 of 3 Weighting during Descent ** Dive Buoyancy
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- Опубликовано: 7 мар 2024
- This 3rd Video is about descent weighting and is just one of hundreds of questions come in to the channel. If you'd like to enjoy Scuba Training here's the link: www.divers-supply.com/scuba-l...
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Most questions I try to reply directly back to the individual through comments.
Yes I do use a translation app to read and reply if needed. 
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Great video. Great Doxa. Thanks Bob!
Thank you Bob! It was I that asked the question. You nailed it! I’m looking forward to trying the right dump valve next month when I dive again, I never used that on a descent before. I’m going to stick with this lower weight and keep working on the descent. For what it’s worth I too dive a scuba pro hydros pro. I’m a SoCal diver, and generally experience this issue more with aluminum 80s than steel 100s. I prefer steel 100s out here, but as I mostly dive nitrox now, aluminum 80 rentals are generally the only option with nitrox. Had the pleasure of diving Catalina last week in 57 degree water… looking forward to getting back to the tropics!
Hey Greg, Thanks for the question and as you can see this is common issue in diving. Sadly some people that are asked about this subject just answer with "10% of your body weight"... ugh I really dislike this reply. 57 Degrees, Burrrrr Thanks Greg !
Awesome series Bob. Please continue.
Thanks my friend ! Working on some more Regards Bob C
Thanks Bob, great presentation. 👍🏻
Thanks Salty ! Glad you enjoyed it.. Regards Bob C
Theres a saying in SEA: "The more you dive, the less weight you use" Now, I'm not sure how true that is for others, but I've found it to be true with myself. I started at 10kg and am down to 4kg after about 200 dives. Slowly making changes to amount and placement. I was o ly at 10kg because that's what my instructor told me to use. Crazy to think about.
You are so correct, experience and comfort make a big difference in lung volume and how you wear your equipment. Thanks much for you comments ! Bob C
Guring my OW Dives in Aug I used a 7mm 2 Piece, 5mm Boots. 22# Pb, ALuminum 80. I had to Fin myself down to about 20 Ft. I was Positive on the surface with almost no air in the BCD. Almost dropped the Kit in about 10 ft water during removal and redonning. I was quick enough to hit the LPI.
Hey Chris, Folks need to consider the fact that suit compression occurs big-time during that 1st 30' of depth. Especially thicker suits. Thanks much, Bob C
Hi Bob, great video!
I’ve found that once you’ve figured out your ideal weighting, it’s also a good idea to scribe it in your log book along with the gear configuration you’re using.
Great tip and something I suggest everyone do. A dive log becomes more valuable than many people realize. Thanks for the Comment ! Regards Bob C
You’re welcome Bob.
I understand why they do it in, as you call people position, they think it's easier, yes it is. But why they don't do it things way: you show it one on your knees so the students could see what's going on while mask cleanin, but you would teach to clean your mask on horizontal position.
The real negative about kneeing isn't the kneeing. The point is, imagine you where at open water, so would you dove to the bottom of the sea so you could kneeing? :)
I prefer to be 2kg over weight, because I still use much air so I prefer to be positive buoyant when my steel tank is at 50 bar.
But I realized it's not really comfortable to be over weight at fresh water, because imagine you would have to keep being at 8m but because of your weight you feel keeping descend you may prefer to be too much buoyant at the end of the dive, but buoyant at 10m, so you would prefer to have less weight.
So me personally I see the benefit to choose less weight and fight a little to decend.
Two Things here;
Ok I get what you saying and yes it's done on knees "because that's the way "they" were taught, BUT why teach it up-right to begin with, any instructor and majority of divers know it's not a big deal to be horizonal to clear a mask... so why teach it up-right and then change ???
You've already conditioned them.
...And weighting is really about the END of the dive vs the beginning... if you're finning to get down at the start of the dive, what the heck are you doing at the Safety Stop when your tank is lighter> unless you're not dumping all your air to start your dive.
At 15' Safety Stop you're only going to have half an ATM of suit compression vs that of surface volume.
So if you're fighting to get down, how the heck do you stay at your safety stop... unless you're one of those folks that just blows it off...
Hi Bob, love the Chanel, really great information. I’m going to be buying my first bc and am trying to decide between the axiom (woman’s) and rogue (woman’s). I’m leaning towards the rogue’s back inflate for good position and good for travel but I’ll be cold water diving too so was wondering if the rogue is more of a warm water BC? Can the size S handle the weight/lift for diving with 7mm wetsuit?
Hey Val, Thanks very much for watching the channel and taking time to send a question.
Here's the lift numbers for a women's Axiom XS: 27. S: 27. M: 35 The Rogue has a flat 35 because of it's components construction.
Buy the Axiom, hands down, nuff said... Now is the Rogue a great Travel BC, sure it is, does it force you into the neutral buoyancy position, yes it does both U/W and on the Surface.
There's about 3 lbs difference between the two.
Thanks Bob, hadn’t thought about surface position
It could be a dangerous too, I don't think 2 or 4kg too much weigh were dangerous, but you reach the point quite fast.
I was two years ago in a dive shop, I asked about weight, I did had any experience with fresh water, the guy there (he is an instructor too) told me, without asking if I got a dry or wetsuit, without asking if it's 3,5 or 7mm. I would need 12kg lead. I was shocked. I had about 10 dives in salt water, where I had 8kg, but I would need 12kg in fresh water. I don't like to blame others, I don't want to judge him.
But what I blame him for was a wrong information without knowing the staff. He should have said: here we dive mostly with dry suit so you may would need 12kg, if you got a semi dry maybe you need 8kg.
This would be more professional.
It's at least what I would have told, if I would be asked for.
Hey Ben, That's why I said I really, let's called it "Dislike" it when someone uses a pat answer without asking enough to be clear enough to provide a correct or at least near-correct answer.
There's not a set answer to cover all the factors that should be taken into account for correct weighting.
My blood pressure starts to climb when I read situations like what you wrote about above.
I get viewers, comments and questions from all over the world but, Folks if you're coming through Jacksonville and you can spend 2 hours to get some proper buoyancy understanding, call us/me and schedule a session. Regards Bob C
@@DiversSupplyYT Hi Bob, this is also a bad reference for this dive shop, I know it's difficult to tell the exact weight you need, but then I would prefer to tell less.
Just imagine you would have bought 12kg lead, even for salt water it would be 2-4kg too much. Then you would like to retour those, but what if they would say: sorry you can't retourn.
I don't like to blame this store, we all do mistakes. But the man who told me I would need this much is also a instructor, so he should know better, at least he should have asked first: do you dive in wet or dry suit?
Whats annoying me most, it's a PADI 5-star divecenter, I don't blame PADI, but if they where really 5-star at service.
They should have asked: how much mm, do you dive in wetsuit, dry suit, what kind of dry suit, what kind of tank do you dive with, how much litre?
Thist would have been 5-Star level.
Maybe my expectation is quite high, but I just got 38 dives and even I know which kind of neoprene efects the weight, also the tank does, in fresh water 12L 4kg but with 15L I felt much more comfortable with 6kg. Maybe because I use still more air. I know quite soon 4kg would be perfect to me for both steel tanks.
But even I know how much need to be considered when it comes to weight
So if I would work at this dive shop, my time would be too good. I would tell: we may don't have a pool, but there is a chance to dive with us every week, bring your gear, I will bring the weights, so we will find out how much need. I wouldn't even charge for my time, because a happy costumer, is more worth.
Maybe another reason is, I love to dive, so to make someone happy is much more worth then money. Or ever worst: yes I sell 12kg lead for ca. Chf 130 instead of 8kg (chf90), but because the costomer realized after a while he is much over weighted, so he lost the fun to dive.
Bob, I guess, even if I don't like to blame, the instructor, for recommending 12kg, after all it's fair enough to blame.
Yes it's 3 years ago or so, but since then a girl drown because she was far too much over weighted.
With all of this in my mind, I guess it's okay to blame him, even if I really don't like to do so. Because we all do mistakes, but when it comes to diving, mistakes can be at least dangerous.
This was the very last time at this store, I asked for any recommendations. Because I didn't felt very safe and I think you should feel save when you ask someone on a dive shop, I guess.
@@benheckendorn2696 Many valid points Ben..