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-----Original Message----- From: David L. McLean <david_mclean@em*.ms*.co*> To: Cavers <cavers@ww*.ge*.co*> Date: Saturday, January 10, 1998 10:54 AM Subject: Fw: Bondage wings (was Re: Scooters) > > >> >> >>>David McLean Writes; >>> >>>This is the first time on the list that I thought I might have something >of >>>reasonable value to add to the discussion. >>> >>>With the inflate time of approx.. 40 seconds or so to fully fill a >>partially >>>inflated wing (with a schrader valve based inflator), then an additional >10 >>or so seconds to over stress the thing,you have some time to manage a free >>flow inflator situation. >>Typical failure mode blows a seam first, then extrudes the bladder, then >>bladder failure >>>occurs with inflation - as noted elsewhere in this thread. With a three >>>finger mitt in a coldwater diving situation the opportunity to quickly >>>remove a quick disconnect from an inflator may be compromised to a certain >>>extent. For immediate management, the oral inflator or elbow dump valve >(if >>>so equipped for non- hogarthian types) provides a flow rate in excess of >>the >>>power inflator. Actuating either valve would control the situation and >>allow >>>for some level of safe ascent or time for assessment. (I assume a >>reasonable >>>closeness to exit in this case, and not an extreme overhead situation with >>>distance to surface). Popping the quick disconnect and continuing the >>>coldwater dive with oral inflation buoyancy management does not come >across >>>as my idea of fun. Thank god for drysuit inflators... >>> >>>Note on the "Bondage wings" - The style with zigzag bungie that takes a >>minor single >>>fold in the wing rather than the multiple constricting loop system used by >>>others bears review. The true drag reduction benefit for the simplicity of >>this >>>style of feature may be beneficial to some. Air flow restriction is >>>significantly less in this type of drag reduction system.True Hogarthian >>>proponents would most probably remove the bungie feature (easy to do) from >>>these wings as unneeded. >>> >>>Question to the repeater list - Does anyone find a freeze up difference in >>>Schrader valve based inflator systems versus piston shaft style inflators? >>>please respond to david_mclean@ms*.co*. I have been getting strong recent >>feedback that higher flow inflators for the larger (110 lb.) lift wings are >>preferable. I tend to side more with the lower flow theory, and proper >>weighting and anticipation of buoyancy need. >>> >>>David McLean >>>Soniform/ JWA >>> >>> >>>Note - >>>-----Original Message----- >>>From: Anthony DeBoer <adb@on*.ca*> >>>To: cavers techdiver <techdiver@aquanaut.com> >>>Date: Friday, January 09, 1998 10:52 AM >>>Subject: Re: Bondage wings (was Re: Scooters) >>> >>> >>>>Garrett Weinberg writes: >>>>> What ever happened to valve shut-down skills? >>>> >>>>Probably the same thing that happens to all the other skills every diver >>>>should have but often turns out not to have when the shit hits the fan >>>>for real. >>>> >>>>Besides, you want to just pop the quick-disconnect on the inflator hose. >>>>That's quicker, and doesn't kill everything else on that first stage. >>>>Only if the whole works is frozen together or the hose end freeflows >>>>would you go to your tank valve. >>>> >>>>-- >>>>Anthony DeBoer <adb@on*.ca*> >>> >>> >>> >>> >> >> > > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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