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Recreational Ascent Rate in the last 15 feet

Discussion in 'Advanced Scuba Discussions' started by rsingler, Oct 10, 2019.

What is your RECREATIONAL ascent rate from SS to the surface? How often do you do a FIVE min stop?

  1. >100 fpm (I just go up)

    3 vote(s)
    2.3%
  2. 60 fpm (15 sec)

    4 vote(s)
    3.0%
  3. 30 fpm (30 sec)

    39 vote(s)
    29.5%
  4. 15 fpm (60 sec)

    50 vote(s)
    37.9%
  5. 10 fpm (90 sec)

    13 vote(s)
    9.8%
  6. Less than 10 fpm (longer than 90 sec)

    21 vote(s)
    15.9%
  7. Never do a 5 min SS

    4 vote(s)
    3.0%
  8. Sometimes do a 5 min SS

    24 vote(s)
    18.2%
  9. Often do a 5 min SS, even for shallower repetitive dives.

    27 vote(s)
    20.5%
Multiple votes are allowed.
  1. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
    2,980
    3,283
    113
    With the advent of Surf GF, and threads like this one: What's your SurfGF and how does it compare to your (Rec) GFHi? ,
    I think it's time to have another survey! :D

    Personally, having looked at the heat maps and the change in offgassing on my Perdix in the last 15 feet, I have markedly slowed my ascent from my safety stop to the surface.

    How about you, and why/why not?
     
    tridacna, couv, Ben_3 and 3 others like this.
  2. Johnoly

    Johnoly Solo Diver

    # of Dives: 2,500 - 4,999
    Location:
    2,229
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    My smb has a 1/8" inch thin line that I wrap around a 5 inch long SS eye bolt. After seeing so many DAN studies on bubble generation and what happens the last 15 feet, the only thing that scares me more is hauling many steel tanks at the dock when your body is exploding with bubbles.

    60 seconds from 15 to 0.
     
    FreeFlyFreak likes this.
  3. Graeme Fraser

    Graeme Fraser Tech Instructor

    # of Dives: 1,000 - 2,499
    Location: Narnia
    454
    573
    93
    Approx 15fpm for me. Primarily to keep the fizz down, but also as a more cautious approach to surfacing in poor viz / high traffic areas. Following the lead of someone else (sorry can't remember who) I've started encouraging this approach with rec and tech students for the above reasons, and so they can practise fine tuning different ascent rates.
     
  4. Storker

    Storker Divemaster

    # of Dives: 100 - 199
    Location: close to a Hell which occasionally freezes over
    12,275
    8,663
    113
    Can't say, but as a general rule, s-l-o-w.

    I know that anecdote, not even in plural, is data, but I almost quit wanting to stop for a nap during my drive home when I stopped corking from my safety stop.
     
  5. RyanT

    RyanT Solo Diver

    # of Dives: 500 - 999
    Location: Maryland
    1,730
    1,356
    113
    I voted 10 fpm, but sometimes as fast as 15 fpm. I do this whether it's a tech or rec dive. As I crawl upwards, I usually make a nice pause at about 7'.
     
    rjack321 and FreeFlyFreak like this.
  6. FreeFlyFreak

    FreeFlyFreak Angel Fish

    # of Dives: 0 - 24
    Location: California
    55
    33
    18
    I've been doing 15-30 fpm, but Im going to start staging it, to slow it down more. After seeing what my tissue pressure's are doing on my logs, almost everything happens in the last 15-20 ft on my average Rec NDL dives.
     
    Johnoly, rsingler and lowviz like this.
  7. FreeFlyFreak

    FreeFlyFreak Angel Fish

    # of Dives: 0 - 24
    Location: California
    55
    33
    18
    That has been my experience too especially in colder water 50'sF.
    In warm water 80's I don't notice it as much.
     
  8. JonG1

    JonG1 Nassau Grouper

    # of Dives: 2,500 - 4,999
    Location: Glossop UK
    104
    30
    28
    1m per minute from 6m on any dive deco or no deco for me.
     
    FreeFlyFreak likes this.
  9. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
    2,980
    3,283
    113
    After all of 13 votes, I think I can say that I already biased the response in my first post, or there are only Advanced Divers responding here.

    With all the ascent rate alarms I see on computer logs when I do their battery changes, there are a lot of missing 100 fpm votes here, lol!
     
  10. Scott

    Scott Tech Instructor

    # of Dives: 2,500 - 4,999
    Location: Salt Lake City, Utah
    2,381
    728
    113
    I started a slower ascent (15 fpm) from 15' after my initial tech course and reading the DAN study on bubble formation.
    I like that Shearwater added the feature, it has showed that it was a good decision for me.
     
    FreeFlyFreak likes this.

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