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When you are correctly weighted for near empty cylinders, the weight of gas is the weight you carrying around on the dive. With ally 80s, removing one cylinder is removing the weight of gas in that cylinder. If you were diving a pair of Ally 80s, removing one cylinder, you would need to add roughly 1 kg to your harness when using a single cylinder.

@@Garry_Dallas fantastic explanation. Thankyou

@@dadgoscubayou’re welcome, enjoy! Please subscribe

Great talk today at the dive show. I'm thinking you may have sold twin Sidemount rebreathers to me!!!

@@dadgoscuba thank you. I’m glad you enjoyed the talk. Let’s do one rebreather for now 😂

Thank you! Trim is one thing to keep constant, but the deployment act is all about safety and time. Time to observe and not just react to too much buoyancy. if you notice, I dump gas from the dry suit as I blow into the back. This counteracst the positive buoyancy

You oh welcome! happy diving 😊

That’s the key to maintaining correct buoyancy and depth as you breathe in air for the DSMB 😉

@@Garry_Dallas What do you do on a wetsuit though? Free up one hand and let air out of the wing?

That’s the simple part of it, matching the volume of gas in the lungs to the dump valve to the gas in the DSMB

Now we are in the realms of trigasery (trigonometry equivalent??).... nightmares!@@Garry_Dallas

@@user-vk9cw7tg7b haha 😂 First you work with your lung volume, and match it to how much you vent from the dump valve. And the gas in your lungs, then goes into the DSMB

Thank you 🙏

@@Garry_Dallas Can you post more dive or skill videos? I'm your fans😍

@@APEDAI thankyou, yes I will 😊

I’ve got some here, so when I see you I should bring them.

@@Garry_Dallas That sounds like a plan!

Thank you Kathy for your kind comments. I’ve kind of refined the skill more since this was taken (by chance) and adopted it for wetsuit diving using a wing only for buoyancy. I will do a video for this. As I’ve mentioned just the other day, using the exhaust bubbles from the regulator is ok if you really practice it, to know what’s the ideal position of the dsmb at the side of the head and how much gas to put in the open ended dsmb. Th boltsnap on the line as you point out is just to keep tension on the line as the line unspools. The other method of purging a regulator, especially in less than 10’ water, invariably incurs a freeflow. As much as it might be possible for some experienced divers to deal with this situation on top of holding a regulator, reel, dsmb and LOOSE line, whilst maintaining their depth and buoyancy, it’s way too much task loading, not to mention crimping the freeflowing octopus You might ask why the regulator method was and is being continued to be taught…? Well simply, diving was originally intended for wetsuit and warm water, freeflows although they can still happen in warm water are less likely. Cold water drysuit divers adopted this similar skill from there on. Does that help?

Thanks for your kind comments! So yes backmount stage kits evolved with para-cord. Ideas seem to get lost in translation over the internet as to why things are needed. Bungee is excellent material to keep tension on cylinders. However once your setup is perfect for you, bungee can be replaced for para-cord. This would be necessary if you intend to support the whole weight of a stage cylinder while standing up on a hard boat, or coupling them together whilst being lifted. If you’re never going to support their weight out of water then bungee will suffice. My lower rigging is rigid and depending on my job. The top is bungeed or fixed. That’s for when using main steel cylinders. All aluminiums I do a bit differently. I hope that helps?

@Garry_Dallas thanks a lot for the thorough explanation.

Thanks for your comments. Would you like to share your method? I’d be really interested to see it being done more efficiently and safely.

@@Garry_Dallas why on earth advocate removing your life support to inflate dsmb mess that up your in a world of hurt unsafe practice, have your reel and dsmb already attached to each other and deploy using octopus or second option from exhaust from main reg

@@hdunbavan4844 thank you for taking the time to write your comment. As you can see from the video, both my dsmb and spool are attached. There are actually multiple ways to inflate a dsmb, clearly obvious by the fact that Halcyon and XDeep, to name a few manufacturers, have designed an oral mouthpiece, to which a diver can orally inflate. As long as the regulator they are using is in their hand when they take it out of their mouth, there should not be a problem putting it back in their mouth. It’s one of the very first skills taught in scuba diving, correct? Using an octopus is used on open ended dsmbs, but causes issues, such as free flows while both hands are in use trying to hold 3 items, regulator, dsmb and reel. You can also opt to use a separate QR inflator hose to inflate the bag. It’s also useful as you say to use the exhaust gases from the regulator, although it’s not as easy to control or know how much the bag is being filled, as opposed to directly breathing from the mouth. Although the actual process in every situation of filling a dsmb has it’s nuances, holding all the equipment necessary can be a juggling act, but the biggest issue is losing buoyancy during the act. I’ve witnessed people getting tangled up in their own line, lose equipment, go up, go down, lose their regs from being caught on their up-line as they deploy, crack bottles not working, freeflows, to name some of them. We have to mitigate all of these issues into something that can be effectively achieved in a controlled manner, and this is something I came up with. The key point is controlling buoyancy throughout the skill, which is what I show as I vent the right amount of gas from my drysuit (or wing if using wetsuit).

Thank you! It wasn’t intended to be a demonstration video for the dsmb skill. It was just to show buoyancy control while doing a complex skill. But it seemed to work for both anyway, thank you 😊

Would you care to show me a more simple technique? I’m always open to ideas, especially if it’s more safe and easy.

I have my Fourth Element Tec shorts and still look as good as new after a few years!

That’s incredibly kind of you to say, thank you 😊

I do believe it was videoed using a GoPro, then edited afterwards.

Hi, it could your default position that makes you feel like you have to be in this position. But it doesn’t sound correct. I don’t know what you had before to understand, but weights and their position is critical and your body muscle memory important to achieve the balance.

Haha this is true, but we gotta make it good for everyone right? Are you only in Sidemount?

Mostly. Dive back mount only when teaching OWD courses.

@@YukonSeanHolland i’m fortunate, having written the RAID Sidemount course and options, we can teach OW divers to dive Sidemount too.

That’s so kind of you thank you. Now this is the first time I read this message, as well as many others I believe a problem with CZcams

That's great for you, whatever works right ;-) The stone wall was a last minute decision to use. Regardless what weight is in the harness, I'd never throw it on the floor, mainly habit though. Normally I support the harness with my left shoulder, as I do a twinset or single cylinder when I remove my left arm while holding the unit from falling over. I find the rubber rings a little too thick for my fingers and gloves, plus I get more stretch with bungee. Also which I will show in another video, another use of the 'slip knots' for locating the power inflators in lateral line with the armpits, below the drysuit inflator. This is a really good position for the lp inflators coming off the 5th ports on the 1st stages to follow the same lateral line. No more crossing over things and interference with drysuit inflator.

Yelp my shoulder method works fine with loading the harness In the trunk as In 99% if cases.

It’s possibly only a monkey skull, but I have seen human remains.

Thank you so much. I hope it was useful?😊

Thank you! I couldn't wish for better valves for my work!

As a test diver, I wear equipment as per instructions, which includes wearing/using equipment on every dive. Two of the three computers I was wearing were on test.

Thank you 😊

Thankyou for your kind words. it’s important to relax, but not focus on relaxing. Achieved when the mind and body are at rest. Each breath is unconscious, similar to that when reading a book. Of course when equipment doesn’t feel right your body’s natural balance senses it and corrects it.

Haha thank you! Practice takes the edge off the shock!

I also tried these rubber rings that came with the system. However understanding the idea purpose for having the "slip knots" is to actually put your thumb inside while feeling for any twisted webbing during the donning procedure. As you put your thumbs in the slip knots, it's ergonomically easy to drag the slip knots up to the armpit level, therefore accessing the main bungee loops. The fat rubber rings make this a tad more difficult, but if that works for you, then go for it. Glad it was of inspiration to you.

@@Garry_Dallas Yep understood, and I'm getting same great results. I thread the shoulder-strap webbing through the o-rings and they slide up/down with just the right amount of tension to stay put. Really easy to find with thumbs, checking for twists, and pull UP during donning... the same as you do it. And with (IMHO) the added bonus of much easier clip-off for LPI's as well. Have fun seeya mate

@@asecret900with wearing drysuit, it really does keep the wing inflator out of the way of the suit inflator and in-line with the lateral bungee attachment points. Glad you enjoying the fun 🤩

@@Garry_Dallas yes agree completely. This setup allows us to slide the wing LPI's up or down, away from the drysuit valve - its a great idea mate... I'm sticking with it 👍

@@asecret900 awesome!! 😊

Those videos have the spool & DSMB separate likely because part of the skill requires them to be put together - Slight task loading with an emphasis on the diver maintaining trim, position and situational awareness. For all practical diving purposes they're attached.

A correctly fitted harness and wing is super easy to dump without even getting out of trim.

@@Garry_Dallas I seem to get better air dump using the dump valve. The inflator doesn't seem to release much air. Does that suggest I am a tad head down ?

@@triman500 I can’t see your setup on the water. The dump valve is the better position to dump air from the wing.

@@Garry_Dallas Thanks Gary.

It was pretty cool, but wrapped warm and dry gloves meant it was no problem 🤙

I wear the instruments on my wrists because I can angle my wrists better to see the info, with my older eyes, than wearing on my wrist which ends up closer than my wrists to view the info.

@@Garry_Dallas I’ll keep that in mind for the near future myself. 🤙🏻

Hi Mohammed, for starters the normal one has just one bladder with an interchangeable position on the wing moving the inflator connection from left to right. The redundant bladder is fitted underneath with a fixed inflator on the right, with the exact same capacity as the normal one. Only one bladder is ever used at once. In the past using other wings, I’ve had a problem with a K-valve or corrugated hose that failed, leaving me without buoyancy in a cave. Now I don’t have this problem anymore with the RB XDeep Tec wing. For more information you can read the XDeep website.

@@Garry_Dallas Thank you sir. Now let's assume I put a blanking cap on the second bladder's OPV, is there a way to remove the whole second bladder's hose and inflator if I didn't need it? (For simple open water dives)

@@clash_120 you’re welcome! In answer to your next question, firstly, you don’t remove any OPVs. It’s important that if you choose to only use one bladder, the other bladder must be vacuumed of air. To do this, you have to vent it on the water, not on the surface. You can blank off one of the inflator hoses, which will not be the redundant hose because this one is fixed and can’t be removed. However, you can fold it in behind the harness and the wing, and just use the other inflator. The procedure in the water is still the same to vent off the OPV that you’re not using.

@@Garry_Dallas That is now clear, so there is no problem with leaving one inflator disconnected from LPI hose.

@@clash_120 that’s correct. If you only want to use one, it’s no problem. But you must always keep the OPVs to vent gas from the wing you’re not using.

As much as it’s possible to do so in certain conditions, it’s not something I would recommend clipping the spool and boltsnap to say a chest D-ring, where it firstly gets forgotten about, out of sight, out of mind. I’ve seen a line from someone’s reel pull a regulator out of the divers mouth as they’re turned around at 30m. I much prefer to see it at all times. I have clipped it to a strap on my wrist before now whilst needing both hands. But that’s what your buddy is for, to hold it 😉

Thank you!!

I hope it works for you too 👌

I’m just a diver. Although i’m a RAID tec instructor trainer and examiner.

Cool. I have done it another way but it involves making another hole, which I’ve done with the Xdeep tooling and original eyelets.

Hi Cameron, how much gas is always relevant upon your depth. At 10m you’re at 2 ata, so the gas is twice the density and half the volume than it would be at the surface. As you always want your dsmb to do it’s job properly, and not get dragged away by surface current, it has to be full at the surface. So, fill any sized bag half full at 10m, it will be full at the surface. All other depths are similarly pressure dependant.

Haha yes it’s pretty significant and people remember which finger to hold the spool with 😜

Most manufacturers offer 40% Nitrox use from new on their regulators. With any of them you can have the O2 clean to be ready for 100% oxygen.

I would recommend you did get a professional on the job. Glues often deteriorate over time. There is also another method that doesn’t require any stitching.

@@Garry_Dallas Thank you!

Wich method ?

@@isualify please read my other reply in your own comment.

Thank you Stephen, appreciated 😊

Hi and thank you 😊 although it’s not really intended as a precisely instructional video, it is fairly easy to see how it’s done. Enjoy!! 🤙

Thank you, more refined now 😊

No I doubt that, more likely you're still off balance ever so slightly.

have you since been in the pool to check?

Thanks but what is? the video?

@@Garry_Dallas The streamlined good trim well buoyanced diving 👏 👌

@@bombousboy thank you 😊

You bet!! 🤩