Mailing List Archive Mailing List Archive
Are you asking me or telling me? If you are asking me, the diffreential depends on the supply gas and the ratio of the bags. Mine are fixed and are different than what is sold to the public, but I can tell you that when I dive any of thes devices, I do the same deco as open circuit. If you do the calculations all the way out, you will see why. There are no "injectors". There are just a reg and a back up reg that supply what the bag asks for. I can also tell you that you are overcomplicating an exptremely simple device. This is not techie rebreather, it is a diving tool beyond compare, which should only be used for extreme situations like what we encounter exploring in the Woodville Karst Plain, or for the kind of dives that Reinhard Buchally is doing in France. Otheriwise, OC is the weapon of choice. Aznan wrote: > > Sorry to butt in unannounced, but > on the PVR-BASC, > > 1 The fiO2 and fsO2 differential above 80ft, > of 7%, is that due to the compensators > compressing the discharge bag, or is there > some gas dynamic at work. > > 2 Because of the dfferential, do I calculate > my deco schedule at 100% or 93%? (pure O2 deco > @ 20ft) > > 3 The discharge bag vents approx 25% off > each breath, how does one tune the primary injector > so that input equals output (or is tuning necessary > in the first place cos' it is linked to bellows movement) > How about the secondary injector? > > Appreciate any reply. > > -----Original Message----- > From: kirvine@sa*.ne* <kirvine@sa*.ne*> > To: Richard Sherington <rs@da*.co*.uk*> > Cc: techdiver@aquanaut.com <techdiver@aquanaut.com> > Date: Wednesday, December 08, 1999 5:13 AM > Subject: Re: WKPP videos > > >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'.
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]