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Going from 7mm to 5mm: How much weight gets ditched?

Discussion in 'General Scuba Equipment Discussions' started by Eyegore, Nov 14, 2019.

  1. Dan

    Dan Orca

    # of Dives: 500 - 999
    Location: Lake Jackson, Texas
    5,662
    3,200
    113
    You need to compare them at the same condition, i.e., soaking wet, as the thicker wetsuits tend to trap more air initially. I had to fin down to, say 5m depth and let out some of the trap air out to begin sinking. Otherwise I’ll be bobbing up like a cork at the surface.

    I think most divers put too much dive weight and ended consuming more air. The proper weight to have is the weight went you are at neutrally buoyant at safety stop with no air in the BCD and 500 psig left in your tank.
     
    Eyegore and mi000ke like this.
  2. aviator8

    aviator8 Professional Photographer

    # of Dives: 25 - 49
    Location: Georgia
    809
    482
    63
    It may also depend on wetsuit style. my 3mm full suits I dive 6 fresh and bump to 8 salt. I have a 5mm two piece farmer john and a top so the torso gets double 5mm layer. I figured I could just add 4 lbs and be good to go. I couldn't get under al all. I ended up having to go all the way up to 14lbs on a fresh water dive.
     
    Eyegore likes this.
  3. FreeFlyFreak

    FreeFlyFreak Solo Diver

    # of Dives: 25 - 49
    Location: California
    512
    659
    93
    Will you be diving a different tank type too? Steel to Aluminum?
    If so your weighting may not change much.

    Steel 80-100, cold wet 8/6/5, 7/5 hooded vest, boots gloves. Im around 10lbs + 5lb plate

    Aluminum 80 warm wet 3mm
    Im 7 lbs + 5lb plate

    I imagine in a 5mm only with Alu 80 i'd be a similar weighting as my cold steel set up. Or at least I'd use that as a start point for me.
    If I add a hooded vest it would need more.
     
    Eyegore likes this.
  4. Eyegore

    Eyegore Nassau Grouper

    # of Dives: I just don't log dives
    Location: Keyboard
    101
    73
    28
    Thank you, interesting question. I don't know what tanks KDC uses on their boat dives.
     
  5. FreeFlyFreak

    FreeFlyFreak Solo Diver

    # of Dives: 25 - 49
    Location: California
    512
    659
    93
    When I dove Kona, different op, it was all Aluminum.
     
  6. Eyegore

    Eyegore Nassau Grouper

    # of Dives: I just don't log dives
    Location: Keyboard
    101
    73
    28
    Going from a 7mm suit with hooded vest to a 5mm suit and no vest I had to ditch six pounds. Au'au Crater was spectacular!
     
    rsingler likes this.
  7. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
    3,535
    4,020
    113
    Thanks!
    Optimal Buoyancy Computer is how I suggested 5-6#.
     

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