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---------- Forwarded message ---------- Date: Wed, 2 Aug 2000 22:21:43 -0400 (EDT) From: Steve Schultz <se2schul@bl*.ma*.uw*.ca*> To: gzambeck1 <gzambeck1@me*.ne*> Cc: techdiver@aquanaut.com Subject: Re: DIR talk vs DIR diving Zambeck, I've done next to nothing with regulators. I do cold-water dives, and ice dives. For that reason, I'm trying to learn more about regulator maintenance, performance, etc. All the information I provided is second hand, and I hope it will be corrected if I got anything wrong. The reason that I mentionned the Swedish guys is because of the diving they do. When I dive under ice, I do it PADI style, but after talking with the Swedish guys, I realize that there are much better ways to ice dive. These guys are the guys to talk to. These guys do big dives under ice and know a lot more than I do, so I'd talk with them. Currently, I've only had Blizzards and USD arctics under the ice. Both without problems. I wish I could contribute more to this discussion, but I can't. Sorry, Steve On Wed, 2 Aug 2000, gzambeck1 wrote: > Steve: > > Have you done much work on the DFC (Dynamic Flow Control) of the first stage of the > Balanced Diaphragm first stage to reduce the IPD ( Intermediate Pressure Dropout)? > > Did some work on the Odins to increase performance of regulator ports, worked well on > some 400 ft stuff a few years ago. Sheck didn't have much experience in colder water > since he dove in water below 60 deg F. > > Scuba Pro gets a bad rap since the basic models are a good solid design for most > recreational diving. > > Greg Zambeck > > Steve Schultz wrote: > > > I was getting some ice diving info from one of the Swedish brothers a > > while back. I believe they use MK14's with apeks seconds under the ice > > for big dives. I wish there were more info out there on this cold water > > stuff. From what it seems to me, those Swedish guys are the ones to talk > > to about dives like this. > > > > BTW, they use enviro kits on the 1st stages. > > > > steve > > > > On Mon, 31 Jul 2000, gzambeck1 wrote: > > > > > So your willing to say that a MK10 used 200 ft under the ice on air, set to these > > > pressures (125 to 145 psi above ambient) is not going to freeze up on me? Is this > > > statement also good for Trimix (TX12/45) at 330 under the above condition?. This > > > is in consideration of the specific heat of the gas mixtures. > > > > > > Greg Zambeck > > > > > > > > > CaptnDale@ao*.co* wrote: > > > > > > > In a message dated 7/29/00 7:38:40 AM Central Daylight Time, > > > > gzambeck1@me*.ne* writes: > > > > > > > > << On the MK14 regulator, what is the interstage pressure and the second stage > > > > cracking pressure that you set the regulator for both recreational and > > > > technical > > > > diving? >> > > > > > > > > The factory spec for the intermediate pressure of all Scubapro first stages > > > > is 125 to 145 psi above ambient. Usually, out of the box, the factory > > > > setting will be about 140 to 145psi. They are set to the high end of the > > > > range for better airflow for the recreational diver. I adjust the i.p. down > > > > to near 125psi for cold water. Even with the older style MK10, MK15 and MK20 > > > > if the i.p. is set low like this there is little likelyhood of icing, unless > > > > you are a real Hoover or you do something stupid like using your second stage > > > > to directly fill a lift bag. The new model of the MK20 has a composite > > > > piston and an insulating sleeve with sharp ridges to break away ice. I think > > > > that it should be a pretty good cold water regulator as long as the i.p. is > > > > reset low. The MK14 is nearly impervious to freeze-up. > > > > > > > > I usually set Scubapro balanced second stages, such as the G250, G500 and > > > > S600 for a breaking pressure of between 1" to 1.4" H2O -- more to the high > > > > side for cold water. The D400 does not need to be readjusted for cold water. > > > > > > > > Safe diving, > > > > Dale > > > > > > -- > > > 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'. > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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