Mailing List Archive Mailing List Archive
Anthony, you re OK. There is one thing about the beautifully streamlined aquadynamic British rebreathers that is puzzling. Reuters reported on the recently completed International Military Rebreather Swimoff Competition held in the Panama Canal. The U.S. team waxed the Brits by nearly five hours in the single coast-to-coast swim competition. And, in the men, singles, wounded-in-combat, continuous round-trip swim, the U.S. outpaced the Brits by seventeen hours. In the team overall category, the U.S. finished first in all timed events including the deep-long-fast marathon. Let me quote from the wire reports. "The results can be partially explained by the superiority of American men but the greater aquadynamics of the American unit contributed significantly to the overwhelming victory". One British officer said, "this is the most severe defeat we have suffered at the hands of the Yanks the since Yorktown." I would personally opt for the U.S. Navy Spec. Ops. Rebreather repair kit. On Tue, 28 Nov 1995, A.Appleyard wrote: > P.S. Re `round-arsed' cylinders, aqualung cylinders with round ends and no > cylinder boots cause a LOT less drag in swimming! If I could collect and add > up all the extra swimming power that all the world's divers have to use to > counteract drag caused by trailing flat ends of cylinders with boots on, I > could run a fair-sized ship on it. Ditto the flat back end of the Carmellan > automatic backpack-box rebreather, as Peter Readey (the Prism man) found. OK, > round-ended cylinders can't be stood up unsupported on land. How often do > designers of ordinary sport scuba gear consider the hydrodynamics of swimming > with it on? One thing useful would be a short but pointed `torpedo-tail' that > an aqualung diver could attach to the back end of his cylinder to streamline > it. This, and trailing pressure air lines running to this and that: drag, > drag, endless hydrodynamic drag, in sport diving, the expression `dressing in > drag' is no figure of speech but literal. How often ever is a man in sport > diving gear tested in a hydrodynamics lab stream-flow tester? Meanwhile UK > naval rebreathers are beautifully streamlined, and less rotation-inertia: for > ordinary shallowish diving give me a set of UK naval frogman's kit any day. > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]