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George, I am curious ... who picked Megadeth? Suggestion to sky-divers: if you are planning a video perhaps "High Speed Dirt" (Megadeth: Countdown to Extinction) would be a good intro :-) G_M kirvine@sa*.ne* wrote: > > Rich- the Halcyon has a small bellows insides a large bellows. The > travel of the bellows is a function of how big a breath you take. That > in turn determines how far the small bellows travels, and the small > bellows has the discharge valve. Big breath gives a big discharge. The > "ratio" is the raitio of the size of one to the other, and then there is > a mechanism that works off of pressure that shrinks the small bellows to > make it discharge less gas the deeper you go. The net effect is to > basicly give you your surface air consumption rate AT depth - meaning > that at any depth you will use the same amount of gas as if you were on > the surface. > > Yes, this is a "waste of gas" relative to a fully closed rebreather, and > by way of comparison, a Cis Lunar will ratio at about 40:1 relative to > about 10:1 for a Halcyon. > > This is not the issue - the issue is electronic vs manual. If I do a > dive with my rb vs Richie Pyle with his Cis, and we both have 80 cu ft > drive bottles at 300 feet, Pyle will use 1/4 of his while I use up all > of mine. However, that is enough gas to do a 10,000 foot dive each way, > and when the two machines have a problem, we will both need adequate > bailout, so again, a "mute" point. We all saw at Wakulla that the Cis > Lunar divers could not get as far as I went on open circuit,let alone on > the Halcyon, so there must be something oprating here - it is a trade > off of playing with the rebreather ( a fun techie occupation) vs using a > tool that is right for the job, the simple Halcyon. > > I personally will not subject myself to an electronic rebreahter while > diving - I would rather pay attention to the diving and not the rb. You > know when the halcyon is not working because either you can not breathe, > or it will not add gas. > > The vidoes are available of of the EE web site, and the music in the > beginning of DIR II is Megadeath. They played Sunday night at a club > near my house here in town. The song you liked is called " A Tout Le > Monde". > > Richard Sherington wrote: > > > > I have been trying in vain to get in contact with Graeme Davison to get hold > > of a few videos especially the rebreather one. The inspiration is the "best > > thing since sliced bread" in England and everyone says the halcyon is JUST a > > semi-closed unit and wastes gas!! I understand the principle of how the > > unit works but would like to understand more about how it actually does it, > > i.e. how the bellows vary the exhalation ratio. Yes I did read the fall > > edition of Immersed. > > > > I saw the DIR II video the other day and it looks as though you have changed > > the way you rig the stage bottles i.e. tying them off at the neck. Is this > > a new way you have found that works better than the diagram put on the net > > by Sean Stevenson? > > > > Lastly, what is the music at the beginning of the DIR II video? I like it > > but don't recognise it. > > > > Cheers > > > > Richard > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.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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