Mailing List Archive Mailing List Archive
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'.
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]