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BP/W set up

Discussion in 'Buoyancy Compensators (BC's) and Weight Systems' started by nns91, Dec 27, 2009.

  1. nns91

    nns91 Angel Fish

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    I am an inexperienced diver looking for my first BP/W set up. I am looking at the DiveRite Transplate with steel backplate. For wing, I am looking at the Oxycheq Mach V. I am going to dive single tank but unable to decide whether I should go for 40lbs or 30lbs of lift. I am 120lbs. I know there is a calculator but I have no clue how to use it so can anyone help me ?
     
  2. deadly_risk

    deadly_risk Barracuda

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  3. paddler3d

    paddler3d Divemaster Candidate

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    30#'s of lift is fine for just about any single tank. The advantage of getting the smaller wing vs. something larger is the smaller wing will be nice and streamlined. One of the joys of BP/W setups is that you can change the wing in the future as your needs change.
     
  4. fisheater

    fisheater Divemaster Candidate

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    It many depends upon your exposure protection. You need enough lift to compensate for the loss of buoyancy that your exposure protection experiences due to depth.
     
  5. nns91

    nns91 Angel Fish

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    No matter whether it is steel of aluminum ? I will be diving at different places so I kinda need some flexibility. Plus, 30lbs will be enough even when I carry some extra things like light,...
     
  6. paddler3d

    paddler3d Divemaster Candidate

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    Most traditional BC provide a max of 30#'s of lift. A lot are in the low to mid 20's.

    If you get a bigger wing, you run the risk of the wing tacoing around you tank, making buoyancy control tougher, and the bigger wing will increase drag causing your air consumption to increase.

    If you see yourself diving with pony bottles and such, the 40# wing may make more sense.

    A 30# wing should give you enough lift for a single tank, steel or AL, lights, compasses, so on so forth.
     
  7. nns91

    nns91 Angel Fish

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    oh ok, so does that mean some BCDs have too much lift capacity ? For example, I have seen Mares Dragon has 44lbs, Oceanic Probe LX 26-54lbs (depends on size).
     
  8. GrumpyOldGuy

    GrumpyOldGuy Solo Diver

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    I purchased a 40lb Mach 5. It will NOT taco, it is a narrow low profile wing. It is however bigger than any normal person would need for a single tank. I swapped it for a 30lb Mach 5 wing, perfect size. I am a a big guy 220lbs, XL, lots of 7/7 FJ+jacket neoprene and I do not come close to maxing it out.

    Many BCD have over sized wings because you load them down with so much lead. The all-in-one integrated concept has its cost, not just dollars but bulk and weight. The BP/W tends to be minimalist and needs less lift, thus less drag, less bulk....
     
  9. paddler3d

    paddler3d Divemaster Candidate

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    At the beginning of this forum is a Sticky on Lift Calculations.

    http://www.scubaboard.com/forums/bu...ems/158370-ultimate-wing-lift-calculator.html

    I don't know how to link to this in the message.

    However the first poster has a link to some excel spreadsheets that will help you do the math taking into account everything.

    Here in the US we definitely have the mentality that bigger is better. Not very one likes the BP/W combo so they make BCD's that have a lot of lift. Is it necessary? Maybe, maybe not.

    Years ago I started in a DR SS Transplate with a Rec wing. It had something like 50+#'s of lift.

    Quickly I ditched the harness system it came with and went with a simple one piece harness.

    For a couple of hundred dives I felt like my buoyancy was never perfect. I felt like I was always being rolled to one side or the other and I was always having to scull with one foot or the other to level myself out.

    One day I grabbed by buddies set up. Nearly the same except he had a 30# wing on it. My buoyancy was spot on. I could lie there motionless. I think the tank I had on was the HP117 steel tank.

    Air consumption also improved.

    Now I have a 30# travel wing for singles and a 60# classic wing for my doubles.

    Look at what tank you likely going to be diving and its buoyancy characteristics, and a couple of pounds for a light, so on so forth. Once you do the math, you may find that 30#'s is a lot.

    Since you're doing a BP/W combo you're likely going to have a D-ring on your butt. This is a great spot to attach a dive reel and lift bag. A lift bag where you can manually dump the air acts like a redundant BC.

    Also remember that a proper weight check will also show you that your wing is, I don't want to say irrelevant, but isn't as crucial until you start diving doubles and stage bottles. When you tank is low (500psi) you should be able to have a completely empty BC and bob at eye level purely by holding your breath. If you can do that, you're just about perfectly weighted.
     
  10. nns91

    nns91 Angel Fish

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    Thanks a lot. I have noticed the calculator but to be honest, I don't really know how to use it so I am posting a thread hoping you guys, experienced divers, can help me.

    A reason I want to go for BP/W is that it is less bulky and customizable so it is true that I don't want something way much more than I need.
     

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