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Halcyon Carbon Plate

Discussion in 'Halcyon' started by LanceRiley, Feb 26, 2020.

  1. LanceRiley

    LanceRiley Barracuda

    # of Dives: 100 - 199
    Location: Cebu, Philippines
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    Hi at present i can dive with a 2 lb plate and a 1 lb STA from a different brand.

    while going through the Halcyon website.

    I realized that the Halcyon STA is 2 lbs. If I get the Carbon Plate which weighs 1.1 lb., will a carbon plate have the same bouyancy characteristic as aluminum? or will carbon plate be neutral? or more bouyant?
     
  2. saxman242

    saxman242 Divemaster Candidate

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    A carbon plate will be more buoyant than an Al plate. It displaces the same amount of water but has less mass.
     
    LanceRiley likes this.
  3. LanceRiley

    LanceRiley Barracuda

    # of Dives: 100 - 199
    Location: Cebu, Philippines
    407
    43
    28
    anybody tried by how much? maybe half a pound?
     
  4. saxman242

    saxman242 Divemaster Candidate

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    About .9 lbs difference between a 1.1 lbs cf plate and a 2 lbs Al plate of the same size
     
    victorzamora likes this.
  5. LanceRiley

    LanceRiley Barracuda

    # of Dives: 100 - 199
    Location: Cebu, Philippines
    407
    43
    28
    i mean 1 lb carbon fiber material vs 1 lb of aluminum.. they might weight the same on land. but underwater. will they differ much as one is more bouyant than the other
     
  6. Kharon

    Kharon Solo Diver

    # of Dives: 200 - 499
    Location: Upstate NY
    4,037
    3,697
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    Here is my WAG. The volume displaced and weight are what determines bouancy (I think). I would guess that the carbon plate would displace less water and I'd expect that the volume would contribute to less buoyancy - but only a tiny amount. The one pound difference in weight would be much more significant. As I said - it's a WAG.

    I'll be interested to see what the real answer is from someone who isn't guessing.
     
    victorzamora likes this.
  7. LanceRiley

    LanceRiley Barracuda

    # of Dives: 100 - 199
    Location: Cebu, Philippines
    407
    43
    28
    What's a WAG?
     
  8. johndiver999

    johndiver999 Manta Ray

    # of Dives: 500 - 999
    Location: Gainesville FL
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    It is slightly LESS precise than a SWAG (scientific wild ass guess).
     
  9. Kharon

    Kharon Solo Diver

    # of Dives: 200 - 499
    Location: Upstate NY
    4,037
    3,697
    113
    I'll stick with WAG. No science involved. Just me blowing smoke.
     
  10. victorzamora

    victorzamora Solo Diver

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    I think the consensus is clear, and I'm in agreement:
    You'll need an extra 1lb of lead with the carbon plate.

    One thing to warn you of: Carbon Fiber and Salt Water are VERY bad together. @tbone1004 can explain it better than I can, as he works in composite fibers professionally, including as a design engineer.....but if the epoxy/resin fails AT ALL, the salt crystals can penetrate and damage the fiber integerity. I'd be cautious. If weight is of the utmost concern and you plan on diving salt water: there are the nylon ultralight backplates (Oxycheq used to make one, among others).
     

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