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Dirt Cheap BP/W Mk2

Discussion in 'Making your own Gear' started by James79, Sep 19, 2019.

  1. James79

    James79 Regular of the Pub

    # of Dives: 25 - 49
    Location: Lower Alabama
    297
    236
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    As promised (threatened?) version 2 of the Death Wish Engineering BP/W!
    On_Tank.jpg On_Tank2.jpg
    This is shown with a Steel 72 and my 13 y.o.'s MK5 with U.S. Divers SEA 4 seconds (cut him some slack, he rebuilt them himself).
    Notable improvements:
    3d printed ABS hardware has been vapor polished (stronger and smoother finished part)
    3D_Printed_Hardware.jpg
    Grommets installed at bottom and top (either side of elbow) to allow water/air out of space between shell and bladder.
    Grommet_Kit.jpg
    Slightly thicker (1/2 inch) cutting board (doesn't flex as much, but I cut it sloppy as hell)
    Cutting_Board.jpg

    More on next post.
     
    SleepySlipper, MattAO and Johnoly like this.
  2. James79

    James79 Regular of the Pub

    # of Dives: 25 - 49
    Location: Lower Alabama
    297
    236
    43
    Regarding the comparisons...
    The following Bill of Materials puts it at $187.80 if you bought everything just for this project, including commercial replacements for the 3d printed parts. However, the only pieces I bought for this project were cutting board, fabric, grommet kit, pond tubing, and kids swim-rings, putting my cost at approximately $55 with parts left over (excess tubing, fabric, grommets, and swim-rings) for 2 more sets. Access to a 3d printer cuts the costs on the BOM by $43 ($65 if you use a 3d printed buckle instead of the cobra buckle my kids insisted on). Compared to approximately $350-600 for commercially produced BPWs I call this a win (and I will be looking at larger swim-rings or alternate bladders in the future for a wing that will fit a standard back plate).

    Bill of Materials:
    Bladder flanges (2 ea) 3d printed or DiveGearExpress $9.00 ea
    DGX Bladder Flange Assembly | Dive Gear Express®

    Over Pressure/Dump Valve (1 ea) 3d printed or DGX $5.00
    DGX BC Overpressure Relief and Dump Valve | Dive Gear Express®

    Plain Elbow assembly (1 ea) DGX $10.00
    Dive Rite Plain (Non-Exhaust) Elbow w/Nut | Dive Gear Express®

    LP Inflator assembly (1 ea) DGX $16.95
    45-degree Oral Power Inflator | Dive Gear Express®

    1 Inch ID pond tubing (16 inches) Lowes $19.98 for 20 feet
    https://www.lowes.com/pd/smartpond-Black-Pond-Tubing/1000843644

    Cam Bands (2 ea) Piranha Dive MFG $17.99 ea
    Plastic Adjustable Reinforced Cam Straps , Piranha Dive Shop |

    11 x 14 cutting board (1 ea) Big Lots $5.50
    Farberware Cutting Board, (11

    D rings (4 ea) Belt sliders (2 ea) Harness T-Plates (2 ea) 3d printed or source independently approx$10.00

    Cobra Buckle (1 ea) Strapworks $22.00
    https://www.strapworks.com/ProductDetails.asp?ProductCode=MTH-SRB-COB-000

    Webbing (10 ft.) Strapworks approx $1.00 ft (pick your webbing)

    600d Polyester Canvas (1 yd.) Amazon $6.99
    https://www.amazon.com/dp/B071WN2Y3D/ref=twister_B07LB85V9R?_encoding=UTF8&th=1

    ¼ inch Grommets (4 ea) Amazon $10.99 (kit)
    https://www.amazon.com/Bememo-Gromm...crafts&sprefix=grommet,arts-crafts,159&sr=1-5

    Upholstery thread (1 spool) Amazon $4.39
    https://www.amazon.com/COATS-Strong...ts-crafts&sprefix=upho,arts-crafts,159&sr=1-5

    Intex 24 inch swim ring (1 ea) Amazon $11.13 (3 pack)
    https://www.amazon.com/Intex-Transp...nch+swim+ring&qid=1568153549&s=gateway&sr=8-1
     
    MattAO, stepfen and couv like this.
  3. James79

    James79 Regular of the Pub

    # of Dives: 25 - 49
    Location: Lower Alabama
    297
    236
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    Lamp Shade Junior rocking the backplate... along with an SP MK5 that he paired with Aqualung SEA4 seconds (he did the rebuilds himself, under my eye) and an old school steel 72.
    LampShadeJunior.png
     
    MattAO likes this.
  4. MattAO

    MattAO Angel Fish

    # of Dives: 0 - 24
    Location: Mobile, Al
    30
    21
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    I was curious how this has held up for you guys.

    I want to try my hand at making one.

    Probably 3D print a portion of the parts and I've got two old BC's lying around for some parts as well.
     
  5. James79

    James79 Regular of the Pub

    # of Dives: 25 - 49
    Location: Lower Alabama
    297
    236
    43
    He only has the one dive on it so far.... Boy Scouts has kept him busy. I've put a handful on the prototype, and so far all is good.
     
  6. MattAO

    MattAO Angel Fish

    # of Dives: 0 - 24
    Location: Mobile, Al
    30
    21
    8
    Awesome. Sounds like it's a solid platform. Appreciate you taking the risk, prototyping, and sharing.

    Time to get to work
     
  7. Diver below 83

    Diver below 83 Regular of the Pub

    # of Dives: I'm a Fish!
    Location: SoFlo
    1,146
    667
    113
  8. James79

    James79 Regular of the Pub

    # of Dives: 25 - 49
    Location: Lower Alabama
    297
    236
    43
    Thanks!
     
  9. MattAO

    MattAO Angel Fish

    # of Dives: 0 - 24
    Location: Mobile, Al
    30
    21
    8
    Just dove my bp/w based and inspired on James79 build. It dove great a few tweaks and it will be amazing.

    Super huge thanks to James and his son for coming and diving with me today to try this thing out. And for all the emails and texts to sort it out and make it work.

    Lessons learned from the dive
    - thicker webbing
    - triglides with teeth
    - crotch strap
    - Keep your wing tight to wide and it tacos

    Thanks again man for the inspiration and ALL the help.
     
    James79 likes this.
  10. Brian Huff

    Brian Huff Nassau Grouper

    # of Dives: 25 - 49
    Location: North Carolina
    116
    117
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    My reactions throughout this thread (and the others)

    Oh, that's funny, a BP/W from a cutting board

    Um, holy crap, he took it in the water

    Hmm, that's an option for light travel gear.
     
    MattAO likes this.

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