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Billy, Dreddy, Steve... and all.. Thanks to everyone who answered.. >Low pressure steels as used in the US are >extremely negatively bouyant. Are they along the lines of those "Super Steel" horrors?, or do you you mean the OMS gear.. not that I've seen the OMS tanks in the flesh? >>. as well as the thread that discussed the pros/cons of locking your >>weightbelt in place with your >>crotch-strap. >rob, you have it all wrong. the v weight is a device utilized by >>drysuit >divers. when wet unditchable weight is, shall we say, dumb. Dredoid, I agree... unless I am wearing aluminiums, and have a major deco obligation... then I would HATE to have my weights accidentally fall off... but then again.... I would also like to have the option of choosing between a bend and drowning... > >That thread concerned single tank open water diving only. Not overhead >diving. Now THAT I didn't pick-up. I'll re-read, but in any case, my query related to open-water diving, too. > >>My question is: >>What's the difference between diving twin steels (and wetsuits) and diving >>weighted twin aluminiums (and wetsuits)? > >Not much. uh.. terse, Billy,.., but OK.. ... right... if you use 120 cuft of air on a dive, you are going to be 120 cuft of air lighter at the end of the dive than you were at the start.... steel, aluminium, or lead notwithstanding.... so who would add lead to steels?... what for?... TRIM adjustments??? >aluminium cylinders are the preferred tanks for ow ocean in wetsuits, >because they swing around neutral and are not overly negative. even the HP >steels like the fabers or genesis are a bit on the heavy side when wet. yeah, but twin alu 95's are BASTARDS to lift (uh..sorry... am I allowed to say "BASTARDS", Dreddy?). >>so, in a wetsuit, aluminium tanks are selected because they will not >> >>anchor you to the bottom. now you have the problem of getting the >>correct >>ballast to be able to decompress. on the same note, if a wing >>fails, you >>would want to be able to move up, instead of being stuck with >>unditchable >>weight. Yep, Dreddy, that's it. On the face of it, Alus would make sense, since if you ditch your weights, you'd stand a good chance of reaching the surface... and potentially a chamber. Better, I suppose than spending the rest of your life on the bottom(!) What I don't get is the one-wing & drysuit is good, redundant wings and wetsuit is bad thing. ... as BillyW put it... > >The REAL question is whether, with a single source of bouyancy, droppable >ballast is preferable to fixed ballast. ....agreed.. can put you in major difficulties, for example.. when you have deco obligation, but need buoyancy fast, and it becomes all or nothing...or when you're at depth, and toss away your weights to find that nothing happens... >Another REAL question is whether, with fixed >ballast, two sources of bouyancy are preferable >to one. Yep... I think anyone who straps lots of heavy objects on themselves, and then jumps int deep water is nuts!...HEY! wait a minute!! > >Finally, a separate question is whether a wing and a drysuit constitute two >adequate sources of bouyancy. > >The answers are: yes, yes, and, try it. Concisely put Billy. And my comment is I agree, correct and I dive with single BC & dry.... in winter, or cold water, or when I choose not to use the wetsuit. .....however, when I dive with a wetsuit in warm water & I add a second wing... as described previously. Now, people on this list talk about the extra drag & extra failure points of a second wing, but aren't wetsuit and 2 wings lower drag, and lower risk than drysuit and single wing? I ask, because it seems that's how it seems to me (at this point!). >>I ask because this is common practice here in Sydney(Australia!). > >Sorry. Which of the above do you mean is common >practice in Sydney? Steels, wetsuits and fixed >weights? Alloys, wetsuits and fixed weights?, Steels & wetsuits. I meant that to be the gist of my post, however, re-reading the Subject line, I wasn't clear. >Locking the weightbelt with the crotch strap? It's a dog's breakfast out >there, but none of >these practices is common. The crotch strap thing referred to the posts.. steels & wetsuits is common in Sydney. >>I use twin "75"cuft steels, and find that with 6lbs of lead (on a >>weightbelt)and almost empty tanks I can maintain a 3 metre stop with an >>empty BC easily (ie, I am neutral). > >Thank you for sharing that with us, Robert. .... ah.. my point in adding this was really a simple statement of fact... it meant that at 3 metres, with twin steels and empty tanks, at least one diver in Sydney requires lead to maintain 3 metres comfortably with BC empty. > >>On a related line... the use of twin-bag BCs has been negatively commented >>on (to put it mildly!). >>When I am not using my drysuit, I sandwich-on a second BC-bladder, >>inflator disconnected. >Understood. We will be looking out for you and are ready to render such >assistance as may be required. ... I don't get it, Billy.. what exactly do you see as wrong with the config I described? regards, Rob ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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