Ascend rate from 5m [was: Re: Things that don't work right now]

[Dirk Hohndel]

On Tue, 2013-09-17 at 10:52 +0200, Robert Helling wrote:
> On 17.09.2013, at 01:57, Dirk Hohndel <dirk at hohndel.org> wrote:
> 
> Hi,
> 
> > Hmm - I am wondering if maybe we are misunderstanding the
> > recommendation. I haven't seen it in its technocratic German beauty, but
> > if I look at my profiles from today I did in fact take 5 minutes from
> > 5m. I spend 3 minutes at about 5m and then 2 minutes coming up to the
> > surface for a total of 5 minutes for the last 5m. Is that what they are
> > talking about?
> 
> you find it here http://www.vdst.de/fileadmin/sporttaucher/Heft_Sporttaucher/2013/201309_ST.pdf on pastes 6--7. 

Ok, that makes more sense. That's exactly the 'safety stop plus final
ascent' that I mention above. I can agree with that. 2 min for the last
5m takes a lot of buoyancy control but is doable and combined with the
safety stop it gives you those 5 minutes.

Of course you can get the same with a 4:50 safety stop and then popping
to the surface in 10 seconds which I think is not what the authors had
in mind... so the way it's written is really stupid. 

Call it "3 minute safety stop and 2.5m / min final ascent to the
surface".
 
> For typical sports diving it does not really matter how you implement
> it. But it comes from the DIR diving community that has been practicing
> a similar rate for trimix diving for quite some time, see
> http://www.gue.com/files/Standards_and_Procedures/SOP_Manual.pdf first
> page with content.

Let's not get started on a DIR discussion here. I would like this
community to remain friends.

/D