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On 1/19/98 8:21 PM Thomas A. Easop wrote: >G. Irvine wrote: >> >> Wings with bungees are ridiculous- they will exert pressure against the >> inflation, and cause the opv to dump well below what the ambient >> pressure would. > >As long as the force on the wings created by the bungee is LESS than that >of the spring in the over preasure >relief valve then they will inflate just a hair less than all the way >before the valve is activated, not 'well >below what the ambient preasure would'. The force of the bungee is key. It >can be checked by fully inflating >the wing before suiting up and seeing how fully inflated it gets before >the valve goes. How come they did not work, is all their double-redundant glory in this case? I'll tell you why, they are a fundamentally flawed design. >> They are obviously going to present a massively >> dangerous static lung load if you try to inflate them manually. >> Massive??? > >> If you tie them too tight to start with, which many of these dopes do >> because they think it is less "drag", they will not give much lift. >> There have been other acidents associated with this, so I believe they >> are now shipped out without the bungeess tied, so this is done at the >> dive shop, or by the end user. Hmmmmmmmmmmmmmmmm........... >> >> The drag issue is realy FAS - the bungied surface causes massive vortex >> shedding and increases drag, not to mention the entangling capabilities >> of all of the bungee and other dangling stupidity associtated with these >> wet dream wings. If you have to add volume to get lift, it will be the >> same volume on any wing, so you want the wing whos shape most closely >> conforms to the gear, as does the Dive Rite wing which lays tight to the >> tank and wraps up around it, with smooth surfaces, already in the slip >> stream. >> >> There is also the problem of two inflators on some of these, a real >> boondoggle . You can immagine the degree of clustery that get set up >> with that arrangement. > >If done right its no cluster at all. What if they are not done right, someone dies? What do you call equipment which is easily rigged wrong? Seen any 3-wheeled off road vehicles lately? They worked great if they were ridden right. Same problem, bad design, poor human engineering, profit motive overriding good engineering. Say, did'nt they get sued out of existence due to too many fatalities? Almost took down some huge companies down with them, as I recall. Not to mention the poor bastards who broke their necks on them. Wake up Easop and sell your stuperwings before you can't get $10 for them. Jim ------------------------------------------------------------------- Learn About Trimix At http://www.cisatlantic.com/trimix/trimix.html -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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