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The 105 meter short bounce is deeper and much shorter, but needs deeper deco more than shallow deco. You can add the 19X35 ( I don't know where you got that other "21/35" bullshit from) if you chose, but it is an unnecessary bottle for the time it is used. In the 105 meter example , moving all the way to 120 with no deco gas is counterproductive for that profile. In the 300 for 30 example, the intermediate deco is more important. Logistics and necessity have to be balanced here. In the 300 for 30 example, if you stay any longer, you will have to add the 190 gas, but then we avoid long exposures in the ocean and opt for two short dives instead. In cave diving outside of the Woodville Karst Plain, there is not much call for the longer bottom times at depth. -----Original Message----- From: Oystein Mehus [mailto:oymehus@on*.no*] Sent: Thursday, February 21, 2002 8:40 AM To: trey@ne*.co* Cc: Gliviak, Jozef; techdiver@aquanaut.com Subject: Re: 300ft/30min George Irvine wrote: > > Get to the bottom in 7 minutes, leave 30 minutes later. > > 300 30 12/70 > > 300-240 3 minutes > > 240-190 5 minutes > > 180-130 7 minutes > > 120 switch to 35% > 120 5 minutes In the thread "105mt for 7mins" on Quest, you wrote that you switched to TX21/35 from 190ft because it was a short dive, and you'd use that gas on 10-15 min dives to that depth. You also stated that you would use the 35% on much longer dives, which is what we see in this profile. Could you please explain why, on the longer dive, you use the 35% and not the TX21/35? -- Oystein -- 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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