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> Date sent: Thu, 11 Jan 1996 02:47:42 -0500 (EST) > From: Phil Pfeiffer <phil@es*.ed*> > To: techdiver@terra.net > Subject: more long hose questions > Please bear with me; some stupid questions follow. > > > *. If it's a good idea for a "tech" diver to use--and to breathe--a long > hose as a way of coping with out-of-air emergencies, then ... > > ... wouldn't breathing a long-hose regulator be a good practice to > follow for *any* one who dives in *any* situation where a fast exit > to the surface might not be simple -- say, in any dive of 60' (20m) > or more, where one would perforce carry an octopus? Yes, absolutely. The University of Florida Academic Diving Program (UFADP) participated in some studies with Duke University (DAN?) several years ago (sorry, I don't have that info, I may be able to get it however), and it was determined that it was safer to always breath a longer hose to pass off in an out of air emergency. As a result, the UFADP teaches the "hogarthian" method to all OW1, OW2, Advanced, AI, Dive Master, and Instructors. > *. How difficult is the head-ducking manoeuver to execute properly? How difficult is it to duck your head? Not very. > How much continuing practice does it require? Not much. If you do a proper S-Drill (we all do, don't we?), then there's no problem. > Sorry if these sound like really stupid questions, but the old American > Red Cross lifeguarding course *drilled* the "suck, tuck, and duck" rear > head-hold defensive manoeuvers -- people had to practice a little > before the procedure became automatic, especially the chin-tuck. > > > *. Could looping the hose around the neck be a danger in its own right? The detractors think it can be, but since you're only using a 7' hose you're not doing a full wrap around the neck. I suppose with a 25' hose maybe you'd have something to worry about, but I don't think that would be the long hose choking you. > What might happen, for example, when a long-hose user is grabbed > from behind by a panicking diver that she does not see? (Scenario > courtesy of Charles Urbanski)? They pull the long hose from your mouth, you let the hose go, and put the regulator around your neck in your mouth. Simple. > What would be the bad consequences of botching the "head-ducking > manoeuver" in this situation? They would still get air and you would still have a regulator in your mouth within 5 seconds, no consequence. You're making it too hard on yourself. > > -. any risk, for example, of the 2nd stage's (1) being pulled > from (say) Charles's mouth, then (2) entangling itself in the loop > of hose around Charles's neck? > > -. if so, is the scenario that I outlined less probable, and less > risky, than the problems of being all too close to the > panicked diver who grabbed Charles's 2nd stage? > > Sorry if these sound like stupid questions, but I've heard enough > panicked diver stories to take them seriously. [One instructor that > we know says he usually gets two or three in his intro classes annually.] > > > *. So, we don't have the second canister around the waist .... > > .... because we're not caving, or wreck diving, or whatever, but we > want to stow the extra hose length. > > Any obvious problems with pushing the extra length under one's weight > harness? Or BC straps? Under the weightbelt. > > > One final apology if this last set of questions sounds equally stupid. > But, if the rationale for the technique is sound for tech divers, then I > see no reason for not adapting the technique for "ordinary" diving as well. > > -- Phil Exactly. Ken -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Ken Sallot "Mock me if you like but don't mock the gods!" CIRCA - Joe Nightengale kens@uf*.ed* (352) 392-2007 http://grove.ufl.edu/~ken -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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