Three thoughts on the night between open water cert dives

[Adamastor]

Correction. @ 10m. Just checked my log book.

Well, 30s from 10m is 20m/min, that's way too rapid indeed, especially since volume is doubled in the last 10m.

The max ascent rate should be around 15m/min at depth and about 6m/min in the last 5m.

 

[Billg68bg]

That’s a little scary. Since I am pretty confident in the time stated. May be off a little, but sounds like my ascent should’ve been around twice as long as I ascended.
Maybe my recollection of events is wrong, but I really don’t think so. Certainly wasn’t off that much.

 

[johndiver999]

That’s a little scary. Since I am pretty confident in the time stated. May be off a little, but sounds like my ascent should’ve been around twice as long as I ascended.
Maybe my recollection of events is wrong, but I really don’t think so. Certainly wasn’t off that much.

Were you taught, or is it your goal to exhale continuously on an ascent?

 

[jborg]

Are you talking about a CESA or a regular ascent? I suspect confusion.

 

[Billg68bg]

Are you talking about a CESA or a regular ascent? I suspect confusion.

It was a skills thing in my OW course. As I remember it, I took a breath of air, removed regulator and, while continuing to exhale, returned to the surface. I know I'm getting kind of old and it was a few years ago, but I remember that being something they had me do.

 

[Billg68bg]

I guess it was CESA. Had to look up the abbreviation.

 

[jborg]

Yes, that was a CESA. Taking 30s to do that from 10m is perfectly fine.

 

[Adamastor]

Yes, that was a CESA. Taking 30s to do that from 10m is perfectly fine.

I guess that depends on the diving agency.

The maximum ascent rate is 18m/min for PADI and 15m/min for CMAS.
Most non-customisable diving computers are set to an allowable ascent rate of 10-12 m/min.

 

[jborg]

Yeah... I think quibbling over seconds when talking about a CESA that happened years ago seems ridiculous. Maybe it took 33s, maybe it was from 9m, maybe he was 3s "too fast", maybe the point of a CESA is just to be controlled anyway. I stand by my "it's perfectly fine". I'd be surprised to see anyone following their computer ascent recommendation when doing an actual CESA under the circumstances it's required.

 

[Billg68bg]

Thanks for the input. Would hate to think I did something wrong and wasn’t corrected. Based on all I have read and learned, it’s slow ascent good, fast ascents bad. Not that I’m a wealth of dive knowledge.