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Greg, Over the last few years, I have became really impressed with your vast knowledge on all diving subjects. Is there anything involve diving that you don't know or haven't done ? -Phi -----Original Message----- From: gzambeck1 [mailto:gzambeck1@me*.ne*] Sent: Thursday, August 03, 2000 3:39 AM To: Steve Schultz Cc: CaptnDale@ao*.co*; mjblackmd@ya*.co*; techdiver@aquanaut.com Subject: Re: DIR talk vs DIR diving 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'.
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