A Sincere Question about Console Vs. Wrist Computers

[tursiops]

Im not sure of when the no faster than your bubbles came out

It is ancient wisdom, at least on the time scale of scuba. And really poor advice....
If you're going to follow your bubbles, (1) follow the small ones, no bigger than 2mm, and (2) follow the new ones on each breath, not the old ones that get bigger and accelerate!
Bubble Speed
Scuba Diving Bubble Mechanics

In the table below, from Ksenofontov et al, Regulation of bubbles ascending speed in water, Materials Science and Engineering, V 492, 2019; note that 0.15 m/s is about 30 ft/minute, so only the bubbles smaller than 2mm are going that slow.

 

[Dominik_E]

Indeed, "bubbles" is a much too broad statement to be of much practical value...

 

[JackD342]

It is ancient wisdom, at least on the time scale of scuba. And really poor advice....
If you're going to follow your bubbles, (1) follow the small ones, no bigger than 2mm, and (2) follow the new ones on each breath, not the old ones that get bigger and accelerate!
Bubble Speed
Scuba Diving Bubble Mechanics

In the table below, from Ksenofontov et al, Regulation of bubbles ascending speed in water, Materials Science and Engineering, V 492, 2019; note that 0.15 m/s is about 30 ft/minute, so only the bubbles smaller than 2mm are going that slow.
View attachment 552643

Great chart. I just wish the columns extended a bit further to the right to see where the bubble size starts to exceed 60 ft/min.

 

[tursiops]

Great chart. I just wish the columns extended a bit further to the right to see where the bubble size starts to exceed 60 ft/min.

Looks like about 4-5 cm....

 

[NAM001]

Indeed, "bubbles" is a much too broad statement to be of much practical value...

I worse comes to worse you go no faster than the smallest bubbles. thats how I always took the rule.

 

[Bob DBF]

Indeed, "bubbles" is a much too broad statement to be of much practical value...

My training was “no faster than your smallest bubble” and one was continuously changing to the smallest bubble. My closeup vision was pretty good then and the ascent was close to using a depth gauge and watch, in both cases it was not a race and one did keep in mind that the ascent rate was to be no faster than 60’/min.


Bob

 

[Dominik_E]

Looks like about 4-5 cm....
View attachment 552676

Nice plot! What is the cause of the inflection between 0.1cm and 1cm? Reynolds number?