Slow, controlled ascent

[hdtran]

Suppose you don't have a dive computer.

How do you make a slow, controlled ascent at 60 (or 30) ft/min? Or can you go 5 ft (looking at depth gauge), then, pause 10 seconds, then, go another 5 ft, pause again, repeat?

Thanks!

 

[Uncle Pug]

How do you make a slow, controlled ascent at 60 (or 30) ft/min?

Use the stuff.
At 60 fpm a foot of stuff goes by per second.
At 30 fpm two feet of stuff goes by per second.
If the stuff is going down you are going up.
If the stuff is going up your are going down.
Here is an older thread on using the stuff.

 

[Snowbear]

At 60 fpm a foot of stuff goes by per second.
At 30 fpm two feet of stuff goes by per second.

Does not compute :06:
Should that be at 30fpm, a foot of stuff goes by in 2 seconds?

 

[Uncle Pug]

Yes! Thank you eagle eye... that is correct... my mistake in not proof reading it.
Usually I go back and proof read my posts and then correct the mistakes... but this time I was busy reading that facinating old thread on watching the stuff.


@ 30 fpm one foot of stuff goes by every 2 seconds.

(of course a buddy with editing powers could have just made the correction for me. )

 

[hdtran]

Thanks! Great thread, that!

I did a search on "ascent," but did not go back far enough! (I quit after a page of less relevant posts).

My eyesight isn't all that great, so the "stuff" I see tends to be macro-stuff (e.g. fish), which will go up or down independent of the water column

 

[jbd]

If you don't have a computer you should still have a depth guage and a watch or timer. You can monitor these. It takes practice. You can also for training /practice purposes do descents and ascents by a line to which you have added some markers to indicate what a foot is. Without touching the line and using breath control move up and down the line stopping and starting in the desire direction. Each movement up or down should only be 3 or 4 inches. Some pools have the little 1" tiles---you can use these for reference also during pool training.

30 fpm is much slower than many people realize. Even 60 fpm
is slower than most people realize.

IMHO opinion, this kind of control would reduce the number of "undeserved hits" to near zero.

 

[vjongene]

Suppose you don't have a dive computer.

How do you make a slow, controlled ascent at 60 (or 30) ft/min? Or can you go 5 ft (looking at depth gauge), then, pause 10 seconds, then, go another 5 ft, pause again, repeat?

Rule of thumb is that your smallest bubbles ascend at about 45 fpm. If you make sure that you ascend more slowly, you'll be in the correct range.

 

[Sharon White]

The human brain is still the best computer, the machine can give you information but not experience.

Sharon White

 

[Bretagne]

IMHO opinion, this kind of control would reduce the number of "undeserved hits" to near zero.

If ascent is too fast, it is not undeserved.
Research done in France has shown that most "undeserved hits" were in fact linked to additional risk factors (age, health, tiredness...). I am not sure that just respecting a slow ascent would be enough.

 

[O2BBubbleFree]

The human brain is still the best computer, the machine can give you information but not experience.]

Don't want to set people off, but just offer a second opinion. Computers don't suffer from nitrogen narcosis, which does affect all humans to some degree at all levels and depths.

I love the stuff watching, as mentioned above, just get tired of all the computer bashing.