10 responses

  1. Dave Jenkins
    June 29, 2011

    Your 7mm suit calulation is not clear and very confusing.
    please explain.

    Also was the first table for fresh water and then add the weight from the salt water table? Or was the salt water table for suit weighting a “stand alone” chart??

    PLease clarify


  2. Tobi1kanoby
    June 29, 2011

    Hi Dave
    I see what you’re saying, the numbers orders got mixed up here and I will fix it shortly.
    If you use a 7 mm wet suit, add 4-5 lbs or 2 KG to your 10% body weight worth of led,
    for example, if you were to weigh 70kg you’d have to carry about 9kgs (7+2). this is a fresh water calculation
    you would then have to add weight due to water salinity as mentioned in the next chart.
    You may also simply multiply the 1st chart result by 1.03 to be more precise.
    Remember, this is an estimation of the weights you’ll need, and you will still need to complete a buoyancy check prior to diving to fine tune your results.
    Hope this helps.
    Let me know if you need further instruction


  3. Paul Ross
    July 17, 2011

    Hi I have had tremendous trouble with buoyancy over 40 dives. I use a full semi dry 7m suit + hood, gloves and boots-in Victorian open water. In addition, to make matters worse I have taken to wearing a 3mill Sharkskin vest. I do now pick up the problems of salt water and different tanks, so thanks for all this information.


    • Tobi1kanoby
      July 17, 2011

      Hi Paul.
      I really hope these tips will help , let me know how you’re doing.
      Where is it you dive that requires so much coverage? is that BC?
      I’d love to see some photos and hear your story and how you come along with it.
      Please keep in touch


  4. Paul Ross
    July 27, 2011

    Hi Tobi–for some reason I do not see any answer from you-tho you indicated you had commented. Neither did I get any personal mail from you.
    I live in Victoria Australia and dive in Port Phillip Bay (Google Dive Victoria Queenscliffe of Portsea center) We have dozens of good dives and many wrecks here within recreational limits. The water recently was about 12 degrees and I am 62 and usually work inside as a Masseur, Naturopath in heated conditions-therefore feel the cold. So this is why I use a Semi-dry wet suit of 7mil, plus a Sharkskin vest that I think is a bout 3 mill or more, boots, gloves and good. Where possible a 15 liter steel air/Nitrox tank, as the aluminium controls me frighteningly. This will be the area I will be doing diving 99% of the time in the indefinite future-outside the occasional trip away to Queensland (Six sleeps to go to an 8 day dive trip there) After this trip I am booked into a navigation course in September then a Stress and Rescue in October, followed by a Wreck course (tho dived on a dozen with supervised penetration already) Somewhere before Xmas I hope to find time to do a “Perfect Buoyancy’ course–but meantime I am fluctuating several meters at my safety stops–especially the 5-6 meter final one. It causes me to use up air quickly and spoil dives for others and work so hard that I lose some of my dive joy. Any and all tips for accurately estimating my needs under any situation –in simple terms if possible, will be very much appreciated. Will be taking camera along for first time this dive trip-so no idea how my head torch and hand torches might illuminate my targets.I will do a photography course next year and get some strobes once I know what I am doing. Thanks. Paul-Australia


  5. Tobi1kanoby
    August 9, 2011

    Hi paul,
    nice to hear from you.
    I’m sorry for the late replay, I’ve been to busy taking care of my first newborn son, didn’t bother with anything else, honestly.
    I guess my message didn’t go through. I have some questions for you:
    Is your gear relatively new? I’ve seen a lot of divers strugle with their gear ( wetsuits) over the first few dives. This is a bigger problem in shallow water, where bubbles trapped in your suit are inflated causing you to be more buoyant.
    Another issue suggested from what you describe here is you’re simply under weighted, which makes it difficult to stay naturally bouyant through the end of the dive.
    I would try a buoyancy check with an empty tank and full gear to see if that is the issue.
    please let me know it the buoyancy issues repeat throughout the whole dive or just at the very end.
    if you think non of these are the cases, please provide more details and I’ll get back to you.
    Thank You


  6. Paul Ross
    August 25, 2011

    Hi I am new to diving with 40 dives under my weight belt. I have so much trouble with sudden descents, fast ascents, difficulty getting down and sometimes staying down, and heaps with my safety stops. I have figured out it is sometimes due to what tanks the dive company provide-aluminium or steel. I have resorted to requesting Steel 15 litre tanks so I can stay down with the teams or buddies, but on occasion I still come to the surface with nil or next to nil air,and on one occasion had to use the hang tank. I am not inclined to panic and try to breathe slowly and deeply etc. So believe it is mainly me fighting with y weights. I have done wreck, Nitrox and night diving and currently working towards master diver with navigation and stress and rescue for my specialties-and see the need to put in for ‘perfect buoyancy, and will when I can.
    Knowing all this and that my height is 5.7, my weight 80 kg and that I use a 15 litre steel tank of 32% when available, wear a sharkskin vest, gloves, boots, hood and 7 mill SEMI-DRY wet suit I wonder if from this information you can advise me what weights should work to start me off please. i will get in the pool next week pre my courses and try it out from there—-but I see that changing equipment, tanks, air remaining etc all contribute to weight needs.
    All help appreciated. Paul


  7. Paul Ross
    August 25, 2011

    Hi. I see there was trouble with my computer not showing the replies above–now after doing a computer clean up Stuff is getting through.
    So thank you for the above replies, and congratulations of the birth of your firstborn, you will find these the best years of your life–until he becomes a teenager anyways! :>)
    Meantime in reply to your questions. My gear is 46 dives old, the water is in Port Phillip Bay Victoria Australia! About 12 -19 degrees in the water, plus I am 62 though I always have hated the cold.
    I was in Queensland 2 weeks ago and it was 23 degrees in the water which I loved and wore only a 5 mill suit-plus ALL the other clothes!
    As for being under-weighted. Most instructors tell me to wear about 10kg–but I have been using up to 13 kgs. On the other hand I have also had to use the BCD to inflate/deflate/inflate to keep my buoyancy. Safety stops are a nightmare-particularly with aluminium. you can write direct to my email if you would as I don’t always check back on all the sites I visit. regards Paul


  8. Rich
    January 28, 2012

    Hi Tobi,

    It would be great if you would clarify your table as Dave asked
    above. I’m really lost as to what: 14lbs/3-6kg – 7 +10% might
    mean. You use the minus sign for a range I think, you don’t
    specify which field is kg and which is pounds. Would it not be
    more simple to have a table with one field in kg and one in lbs?
    Would it not be easier to use the word ‘to’ rather an the – sign?
    You might also loose the kg or lbs completely and let your readers
    work out the conversion. It’s such a shame that this potentially
    useful page is just so cryptic.

    All the best,



    • Tobi1kanoby
      January 29, 2012

      Thanks Rich for your comments
      I had some technical issues with the tables, all sorted now, and I hope this make more sense now.
      Thanks again for your time and effort.


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