Tech 1 .... hours just hanging around?

Martin Burnard · December 17th, 2005, 02:43 PM

Ok I have your attention.

I am considering doing the Tech 1 course because I enjoy my diving. This raises my question though...

If I do a 45 metre dive how long on the bottom gives what sort of deco?

This is because if am going to spend excessive amounts of time mid-water in relation to the bottom time I might not bother, and just continue to hone my skills up to 30 metres.

I don't require massive detail just some examples.

*Brian Allen* · December 17th, 2005, 03:09 PM

Hey buddy

I suppose we'll learn a bit more about all this soon, but i just downloaded vplanner to have a look at rough run times on 21% O2 35% He. www.hhssoftware.com/v-planner/download.html

Not sure i used it properly as it's the first time i've had a play but, a 45m dive with a 30 min bottom time, gave this... (I know it's not DIR as we'll be doing deco on the fly, but it gives a rough example).

Dec to 45m (3) Triox 21/35 15m/min descent.
Level 45m 27:00 (30) Triox 21/35 1.15 ppO2, 21m ead, 26m end
Asc to 24m (32) Triox 21/35 -9m/min ascent.
Stop at 24m 0:40 (33) Triox 21/35 0.71 ppO2, 9m ead, 12m end
Stop at 21m 1:00 (34) Nitrox 50 1.54 ppO2, 10m ead
Stop at 18m 1:00 (35) Nitrox 50 1.39 ppO2, 8m ead
Stop at 15m 1:00 (36) Nitrox 50 1.24 ppO2, 6m ead
Stop at 12m 3:00 (39) Nitrox 50 1.10 ppO2, 4m ead
Stop at 9m 3:00 (42) Nitrox 50 0.95 ppO2, 2m ead
Stop at 6m 6:00 (48) Nitrox 50 0.80 ppO2, 0m ead
Stop at 3m 10:00 (58) Nitrox 50 0.65 ppO2, 0m ead
Surface (58) Nitrox 50 -9m/min ascent.

Bri

Martin Burnard · December 17th, 2005, 03:20 PM

That doesn't look too onerous.

Considering my ascent from 30m is 14 minutes avoiding deco, the extra time is not particularly a problem. I had visions of taking "War and Peace" with me to read on the stops!

*Clare Gledhill* · December 17th, 2005, 03:29 PM

I'd take a little more time than Brian's example Martin, as we would start our stops a bit deeper but expect about a 37 minute total ascent time for the dive you mention.

Martin Burnard · December 17th, 2005, 03:51 PM

Hi Gledders
I have just dug out your Q on YD and the reply from And.

40m dive depth, 35 minute bottom time, gave a run time of 68 minutes, most of the time being done on slow ascent rate plus a couple of stops.

Again reasonable... no need for the book there either!

Still not convinced due to second question popping in to my head ...

Are multiple dives in a day possible in this type of diving? or is it a case of 1 dive is your lot for the day!

**Alastair** · December 17th, 2005, 04:04 PM

Quote: (Originally Posted by Martin Burnard)

Are multiple dives in a day possible in this type of diving? or is it a case of 1 dive is your lot for the day!

Multiple dives are not a problem - you extend your deco on a repetitive dive. I have to say though I am getting lazier these days - we'd tend just to do one as it's less effort!

Edit - Just had some more thoughts about your first post. The Tech-1 course will actually move your inwater skills on massively from fundies. The deco is part of it but you will find the drills, teamwork, light signals, line laying and rescue skills all help no matter what diving you end up doing.

Cheers
Al

boomx5 · December 17th, 2005, 05:40 PM

Quote: (Originally Posted by Martin Burnard)

Ok I have your attention.

I am considering doing the Tech 1 course because I enjoy my diving. This raises my question though...

If I do a 45 metre dive how long on the bottom gives what sort of deco?

This is because if am going to spend excessive amounts of time mid-water in relation to the bottom time I might not bother, and just continue to hone my skills up to 30 metres.

I don't require massive detail just some examples.

The Tech1 class will teach you an additional set of skills to take you to the next level in your diving. There is no reason to do dives which require longer deco obligation if you don't want to. You can do 100' Tech1 level dives just outside the minumum deco limits if you want, it just extends your diving a bit. Besides, they like you to keep your deco obligation relatively short...20-30 minutes since the limits of the class are only one deco gas.

As far as a 45 meter (150') dive goes (and if you are using Ratio Deco), if you spend 30 minutes, it'll give you 30 minutes of deco. My recommendation would be to find a GUE instructor and quiz him/her with your questions to find out if the timing is right for you to take the class.

Good luck,

Martin Burnard · December 17th, 2005, 08:55 PM

Thanks all.

The more I read and ask on this site the more I like it!

Little Pete · December 18th, 2005, 10:51 PM

Don't tell me you're going in for the Tech 1 class as well Martin. Think of the fundies team and poor student me having no money to do Tech 1 yet :p

Martin Burnard · December 18th, 2005, 11:01 PM

Sell your body, cry infront of your parents, become a trainee teacher (get the grant, spend it, then say sue me!).

Oh welcome back for Xmas.

December 17th, 2005, 02:43 PM	#1 (permalink)
Martin Burnard (Online) New Member Join Date: Nov 2005 Location: Plymouth, UK Posts: 580	Tech 1 .... hours just hanging around? Ok I have your attention. I am considering doing the Tech 1 course because I enjoy my diving. This raises my question though... If I do a 45 metre dive how long on the bottom gives what sort of deco? This is because if am going to spend excessive amounts of time mid-water in relation to the bottom time I might not bother, and just continue to hone my skills up to 30 metres. I don't require massive detail just some examples.

December 17th, 2005, 03:09 PM	#2 (permalink)
Brian Allen(Offline) GUE Instructor Join Date: Nov 2005 Location: London & Plymouth Posts: 593	Hey buddy I suppose we'll learn a bit more about all this soon, but i just downloaded vplanner to have a look at rough run times on 21% O2 35% He. www.hhssoftware.com/v-planner/download.html Not sure i used it properly as it's the first time i've had a play but, a 45m dive with a 30 min bottom time, gave this... (I know it's not DIR as we'll be doing deco on the fly, but it gives a rough example). Dec to 45m (3) Triox 21/35 15m/min descent. Level 45m 27:00 (30) Triox 21/35 1.15 ppO2, 21m ead, 26m end Asc to 24m (32) Triox 21/35 -9m/min ascent. Stop at 24m 0:40 (33) Triox 21/35 0.71 ppO2, 9m ead, 12m end Stop at 21m 1:00 (34) Nitrox 50 1.54 ppO2, 10m ead Stop at 18m 1:00 (35) Nitrox 50 1.39 ppO2, 8m ead Stop at 15m 1:00 (36) Nitrox 50 1.24 ppO2, 6m ead Stop at 12m 3:00 (39) Nitrox 50 1.10 ppO2, 4m ead Stop at 9m 3:00 (42) Nitrox 50 0.95 ppO2, 2m ead Stop at 6m 6:00 (48) Nitrox 50 0.80 ppO2, 0m ead Stop at 3m 10:00 (58) Nitrox 50 0.65 ppO2, 0m ead Surface (58) Nitrox 50 -9m/min ascent. Bri __________________ ...dive planning again ... GUE fundamentals and Halcyon Equipment Online www.ocean-explorers.co.uk

December 17th, 2005, 03:20 PM	#3 (permalink)
Martin Burnard (Online) New Member Join Date: Nov 2005 Location: Plymouth, UK Posts: 580	Cheers Brian That doesn't look too onerous. Considering my ascent from 30m is 14 minutes avoiding deco, the extra time is not particularly a problem. I had visions of taking "War and Peace" with me to read on the stops!

December 17th, 2005, 03:29 PM	#4 (permalink)
Clare Gledhill (Online) GUE Instructor Site Admin Join Date: Nov 2005 Location: UK Posts: 1,540	I'd take a little more time than Brian's example Martin, as we would start our stops a bit deeper but expect about a 37 minute total ascent time for the dive you mention. __________________ Clare . "Keep away from people who try to belittle your ambitions....Small people always do that, but the really great make you feel that you too can become great." Interested in DIR dive training? Always happy to chat/answer questions so get in touch via PM or visit www.dirdiver.co.uk

December 17th, 2005, 04:04 PM	#6 (permalink)
Alastair(Offline) DIRX Supporter Join Date: Nov 2005 Location: UK Posts: 693	Quote: (Originally Posted by Martin Burnard) Are multiple dives in a day possible in this type of diving? or is it a case of 1 dive is your lot for the day! Multiple dives are not a problem - you extend your deco on a repetitive dive. I have to say though I am getting lazier these days - we'd tend just to do one as it's less effort! Edit - Just had some more thoughts about your first post. The Tech-1 course will actually move your inwater skills on massively from fundies. The deco is part of it but you will find the drills, teamwork, light signals, line laying and rescue skills all help no matter what diving you end up doing. Cheers Al __________________ Helium is our friend - GI3 Last edited by Alastair; December 17th, 2005 at 04:12 PM.

December 17th, 2005, 03:51 PM	#5 (permalink)
Martin Burnard (Online) New Member Join Date: Nov 2005 Location: Plymouth, UK Posts: 580	Hi Gledders I have just dug out your Q on YD and the reply from And. 40m dive depth, 35 minute bottom time, gave a run time of 68 minutes, most of the time being done on slow ascent rate plus a couple of stops. Again reasonable... no need for the book there either! Still not convinced due to second question popping in to my head ... Are multiple dives in a day possible in this type of diving? or is it a case of 1 dive is your lot for the day!

December 17th, 2005, 05:40 PM	#7 (permalink)
boomx5(Offline) New Member Join Date: Nov 2005 Location: California Posts: 45	Quote: (Originally Posted by Martin Burnard) Ok I have your attention. I am considering doing the Tech 1 course because I enjoy my diving. This raises my question though... If I do a 45 metre dive how long on the bottom gives what sort of deco? This is because if am going to spend excessive amounts of time mid-water in relation to the bottom time I might not bother, and just continue to hone my skills up to 30 metres. I don't require massive detail just some examples. The Tech1 class will teach you an additional set of skills to take you to the next level in your diving. There is no reason to do dives which require longer deco obligation if you don't want to. You can do 100' Tech1 level dives just outside the minumum deco limits if you want, it just extends your diving a bit. Besides, they like you to keep your deco obligation relatively short...20-30 minutes since the limits of the class are only one deco gas. As far as a 45 meter (150') dive goes (and if you are using Ratio Deco), if you spend 30 minutes, it'll give you 30 minutes of deco. My recommendation would be to find a GUE instructor and quiz him/her with your questions to find out if the timing is right for you to take the class. Good luck,

December 17th, 2005, 08:55 PM	#8 (permalink)
Martin Burnard (Online) New Member Join Date: Nov 2005 Location: Plymouth, UK Posts: 580	Thanks all. The more I read and ask on this site the more I like it!

December 18th, 2005, 10:51 PM	#9 (permalink)
Little Pete(Offline) New Member Join Date: Nov 2005 Location: UK Posts: 509	Don't tell me you're going in for the Tech 1 class as well Martin. Think of the fundies team and poor student me having no money to do Tech 1 yet :p

December 18th, 2005, 11:01 PM	#10 (permalink)
Martin Burnard (Online) New Member Join Date: Nov 2005 Location: Plymouth, UK Posts: 580	Sell your body, cry infront of your parents, become a trainee teacher (get the grant, spend it, then say sue me!). Oh welcome back for Xmas.