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when unpressurised the swivel connection will indeed have a fair amount of play in it, as this is to allow the centre spool that carries the two o rings to self align. And the pressure pushing axially along the hose will act to extend the swivel to its end stops under pressure. The squeek just...

modern 2nd stages typically use a reasonably large amount of venturi effect, and so when you inhale, the reg is (to some degree) actually blowing air into your lungs, ie it is supplying air at a total (static + dynamic) pressure above ambient water pressure. When you exhale however, there is no...

I should note my 11 to 13 l/min is for warm water when relaxed! I'm only just around 75 kg body mass and a keen runner and mountain biker, so i have a very decent aerobic fitness which i suspect helps a lot!

Whilst diving, I've always tired to breath slowly and relatively deeply, perhaps 4 to 5 dec breath in, and 6 to 7 sec breath out, using my diaphram as much as possible to get the best air exchange and CO2 flushing. My SAC tends to sit between 11 and 13 l/min depending on circumstance. However...

My (belated) advice, don't ignore time in the pool! In the pool you are free to work on your skills and your skills only, and it's safe enough that if you mess things up, you'll be unlikely to inconvience anyone (including yourself). And ime, if you can do all you skills at neutral buoyancy...

Whilst i certainly agree with the overall sentiment of this ^^^ suggestion, it's a bit of a dichotomy imo, precisely because the single biggest "advantage" of a BP/W setup is it's flexibility and configerability! That capability necessarily makes it more complex to specify and setup, and the...

er i have a BP/W in fact i have two! My doubles are obviously on a BP/W and i have a single tank BP/W and wing as well! My hydros is my "Holdiay" rig for warm water diving, at which it excels imo. I wouldn't do a 50m doubles deco dive in 10degC water in the english channel in it any more than...

If you want a BP/W then buy one! The Hydros isn't one, and isn't really trying to be imo! What it is, is a really comfy, decent quality, easy to trim recreational bcd for people who want good gear but doing do a million dives a year. It's got good and bad points, like all gear of course, but...

One thing i will say is that buoyancy takes practice, so grab every opportunity you can, and don't discount "Boring" pool sessions as if you have decent control in less than 3m of water, you'll be a buoyancy ninja in 20 meters! Also, small pools are really good for making you sort out your...

BTW, i like Dive talk because both the contributors come across as enthusiastic, pasionate, and interesting. That for me, is far more important that absolute accuracy!

The first rule of the internet and you-tube in particular, don't take ANYTHING as gospel! Everyone makes mistakes, adds embelishments and their personal preferences and biases show. Consider, properly, what is said and suggested, but don't be afraid to both disagree or do something different...

One of the (few) advantages to training in a shallow pool is that it makes this sort of thing much harder, because you have very little depth to play with, and because the bottom is always just there, in full view, you can easily see exactly how good, or bad, your trim and vertical control...

I say try one! With a surface breathing valve you can just about gently swim out with the mask in place and not use any backgas in non choppy water. Not as good as snorkling because you'll probably have to swim on your back, so you'll need to keep stopping to look where you are going, but...

Bit late now, but the cheapest option is just to remove the O ring from one of the LP port blanking plugs! To check tank pressure, you only need to open the valve for literally 1 second, so with a "leaky" LP blanking plug, the system just leaks itself down when you shut the cylinder valve...

I think it's easy to confuse the Core with the Tech computers it looks much like, and Suunto's marketing are clearly pushing it as a sort of "cross over" computer. But, IMO, it's not a Tech computer, but it is a REALLY good Rec computer. Big, clear colour screen, big buttons, easy to navigate...

stupid (maybe) question regarding drysuit and Neutral Buoyancy: With a Trilam drysuit, the material of the suit is broadly incompressable, therefore, if i adjust my overall weighting so as to have just the right amount of air in my suit to get the right squeeze/insulation, then i won't need to...

Diving in fresh water all i do for DIN 1st stages is to purge the pressure, undo the 1st stage enough to ensure the O ring is not seated, and very carefully open the cyl valve a small amount. Just enough to push some air out and round the DIN threads, which also pushes out any water that had...

^^^ that is exactly what i was trying to say, thanks DDM !!! :-)

Sorry, no, i should have been clearer! Over the last 100 odd years the deco tables have been calculated, estimated and currated. On average, those tables are conservative enough to mostly stop us divers getting bent. So we can look at the values in those tables and use that to estimate the...

Given that the common dive tables and algorythms used by the massive number of divers year round mostly stop people getting, on average, bent, then we can look at those numbers to see at what depth we get to a limiting tissue tension assuming saturation and instantaneous surfacing.