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Its a matter of partial pressure. The net flow of gas will be into the tank, but there will still be a diffusive force on the He to move into the space where there is less helium. The degree to which this occurs could be negligible, but concentration gradients can oppose bulk flow.

If you're filling from a bank of compressed air, then attaching a trimix tank to it will cause helium to diffuse into your banked air. I guess depending on the volume of the bank, this could be a negligable amount. Regardless, I wouldn't do risk it, especially if you're running a commercial...

I was about to say... I'm pretty sure I saw this in a Bond movie. I think the baddie was Jaws... he takes an axe or something to the "hose" pressurizing the chamber causing a catastrophic self-disassembly of the poor schmoe in the chamber.

Back inflation is awesome. If you ever get to use a jacket again, you'll start to laugh (or curse, depending on your mood) at how cumbersome it is (constant readjustment at depth, the squeeze on the surface, etc). New gear is also awesome. Good luck on the dry suit. Taking the class is a good...

Another vote for a 7/5 Pinnacle Merino or Elastiprene. Their "semi-dry" marketing hype has quite a lot of truth to it... very little water will in or out of your suit once its saturated. I dove that suit for two seasons in New England (45-60F), and it always kept me toasty and comfortable. Its...

You mentioned the tank has been sitting empty for a number of years? That would concern me, though if it was in his garage and the valve was closed... perhaps its alright?

I disagree with this sentiment. In my mind, the pony is there to enable a safe and controlled abort in the event of a tank or reg failure. Why risk being bent on the surface when you can plan to have enough gas to abort the dive as you would any other... with a safety stop? Because of this, I...

I just did these calculations yesterday. So, lets assume a worst case scenario of a catastrophic gear failure that catches you off-guard. With adrenaline rushing, you start breathing 1.5Ft^3/min. After taking 1 minute to alert your buddy and assess the situation, the gas required for just you to...

Hi - So I did my first sub-40F dive today (39, but hey, that counts!) Anyway, I was massively impressed with my old Sherwood Brut in its ability to do its job and not freeze. My understanding is freeze ups can happen <45F and it is exascerbated by heavy breathing. Since my unsealed, unbalanced...

Hey - I'd like to get in contact with Marc from PG. I moved to Indiana last June, expecting to see him when I came back to visit (read: dive) this summer. Anyway, I'm hoping that one of yall could link me up with him. I just want to say hi to a friend. I'm not a punk looking to fix a bad sale or...

Hey - If anybody could help me get in contact with Marc from PG, I'd appreciate it. I was a loyal customer from 06-08, and I went to Cozumel with Marc. I understand that Marc is the kinda guy that appreciates his privacy, but if any of you are in contact with him, please say Brett says hi, or PM...

I'd be interested in driving down for some dives. Not a definite, but I'll keep an eye on this thread. -Brett

I don't mean to pick your post apart - I certainly agree with you on all your other points. I'd hate to dive a padded harness on bare skin! And limited shoulder flexibility truly would make donning and doffing considerably more difficult. But... I'm not sure how being able to adjust your...

I certainly think at least a sidebar should have been included. As mentioned, the impact of tanks bashing the cave is a serious one, not to mention the fact that my cenote tour definitely took a liberal view of the "within the light zone"! An amazing experience, but you gotta be prepared.

Rescue. He was filled with information about self-rescue and redundancy and would go at lengths about what to do if you got caught in spider wire. But yeah, it was almost a chore to bring him back to the course outline. For example, during our diver tows/rescue, somebody dropped their mask...

I'd like to throw ORGANIZED into the mix, here. I've had an instructor who seemed like he was making it up as he went along. It was a great class, and I learned a ton, but thats only because I felt like I was guiding him with my questions. Being PREPARED is more than just being able to teach...

Thats crazy... I'm glad I've yet to stumble upon such a lemon shop!

I know what you mean about the 6 doing more than you really need. I had been planning on getting a DSV... I've talked to a few zeagle owners and they all pushed me in that direction (and these guys have been down deep and cold). But for $20 more... why not go for the flathead, haha! Still...

I can't find any performance comparison between the 6 and the 7 anywhere, so I think it might be just the extra port and more compact design. And wow, talk about a clearance price! I think the only question left in my mind is do I buy one or two!?

I just went to Zeagle's site and saw they have a new reg, the Flathead 7 coming out. Anybody know anything about this? Any upgrades to the Flathead VI, or just a little comsmetic repackaging? Note to self, start looking for Flathead VI on clearance...