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You two must have an absolute ball watching Star Trek episodes. :rofl3:

Aaah, gotcha. Reminds me of that old high school problem which blows all our minds when we first hear it. How a motorcyclist (or driver or runner or alien space ship or your mother-in-law on her motorised wheel chair) is accelerating* when he/she/it travels round a circular track with the...

You mean like someone who is positive but angles their scooter downward to compensate and thus stay at a constant depth despite their positive buoyancy? I think b1gcountry would just say that is exactly what he is talking about. Another discrete force which nevertheless adds to the cumulative...

+a ... hold on, I meant: +purple ... no hold on: +1. Thats right ... +1. Precise terminology is just another tool in your [engineering] toolbox. If you don't need to use it, why go out of your way? My professors understand exactly what I mean when I say 'current' even though I should...

:hijack: A nerd you say? Hmmm ... :headscratch: You wouldn't happen to be a WoT nerd? ;)

That reminds me soooooo much of someone on another subforum! He posted some hogwash about how to check your weighting during your safety stop ... on a thread about helping students learn how to control their buoyancy. :lotsalove: The only link that I could maybe see between what he wrote and...

My signals are pretty similar to a number of other people's but for what it is worth I'll explain them anyway. :D When I want to communicate a missing diver I make a circular motion with a single finger in a horizontal plane to indicate everyone around us. Then I hold up n-1 fingers (where n...

"... of little black girls and little white girls, playing with each other. Let's make it happen." - Ali G. :rofl3:

Well, when I set up my harness I positioned the d-ring by bending my arm at the elbow, holding it parallel to the floor and positioned the d-ring where my thumb touched my chest. That is at more or less the bottom of my collar bone. Since first diving with Sea Biscuit I have moved it further up...

The short (and dirty) answer is that helium is an inert gas, just like nitrogen, so it needs to be eliminated from your body just like nitrogen. Just because you don't have enough nitrogen in your body to require deco, it doesn't mean that you don't have enough helium to require deco. Added...

Well ... I did some fiddling and got into the water and my pony (who has now been dubbed Sea Biscuit) felt better. I'm not sure whether it was the changes or I was just more comfortable with her (and thus less aware of her) underwater. Still not 100% happy but it is a start. P.S. Pics because...

Ditto. When I bought my reg I dearly wanted to get a Mk19 for the turret. The place where I eventually bought my Mk17 from could get me a Mk19 but it would have cost R2000 ( ~$250) more. There is just no way I could justify spending that amount of money on hose routing but it nearly broke...

Uhhhh ... those two first stages are diaphragm designs, not pistons. Silly tec. :shakehead: P.S. I have a Mk17/G250V and am very happy with it.

What do you mean by 'insisting'? It is! ;)

Well, to continue my trend of being nit-picky from my last post ... :dork2: Not all waves have electric and magnetic components. You get sound waves, light waves, fluid waves (which are basically sound waves at MUCH lower frequency) and, if you believe some crackpot contemporary quantum...

I did too ... in 15C (~60F) water!!! P.S. 35 minutes ... :acclaim:

But if you aren't using this definition to classify RB diving as tech, which one are you using? You can't rely on a definition for one style of diving to define 'tech' and then not use any definition at all for another simply because 'everyone knows that it is tech.' The definition is there...

Changing ppO2 != regulator switch. You freely admit that rebreather diving is tech but your definition also excludes it. You contradict yourself.

Happily the best way to get more comfortable (and hence confident) with diving is to go diving as much as possible. As if you needed a reason to go diving :rofl3: I'm not certain that I can help with you feeling nervous because I also struggle with that sort of thing in all parts of my life...

No, it doesn't involve a lot of mathematics buleetu. At least, the PADI one doesn't. The aim of the course is to ensure that you understand the basic theory behind EANx. Why it gives you more NDL, what the dangers are, how to avoid the dangers, when it is appropriate to use it etc etc There...