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Weighting Question

Posted: Mon Jul 20, 2015 9:21 pm
by Wolver
Typically, how much more weight is needed when going from fresh to salt water? I have been diving 20 lbs with a steel hp130 in fresh cold water with a 7ml farmer john. My wing has a 34 lb lift. I am basically wondering if I need a bigger wing for cold salt water or not. It seems like it might be really close to my max lift for my wing. What say you? Thanks.


Re: Weighting Question

Posted: Mon Jul 20, 2015 9:40 pm
by Desert Diver
If your wing has 34lb lift in fresh water it will have about 2 1/2% more lift in salt water. And your total body and equipment weight will be 2 1/2% more too with the extra 2 1/2% being lead.

Re: Weighting Question

Posted: Tue Jul 21, 2015 12:00 am
by CaptnJack
You only need enough lift to compensate for 1) the weight of the gas (about 8lbs) and 2) the compression of the suit (roughly 10 to 15lbs assuming you aren't taking it to 180ft)

34lbs is fine although a weight check when the tank is empty can easily confirm and put you at ease.

Re: Weighting Question

Posted: Wed Jul 22, 2015 9:33 am
by KneeDeep
my singles is a 35# wing (DSS) with a HP130 in salt... works great

Re: Weighting Question

Posted: Sat Aug 15, 2015 6:38 pm
by sarinae

Just to confirm, my weight requirements are about the same as yours for wet diving. I looked at my notes, looks like I used 28 lbs for my first wet dives in class, but that is always over weighted. I haven't dove around here wet since I first learned. With my drysuit when I was first learning I used 34 lbs and a steel 119. Since then, I have dropped it down to 26 lbs as I learned to better manage and streamline my rig.

So, when I was first learning wet I was diving a jacket style bcd, 28 lbs, 7mm farmer john on an al 80.

I added a drysuit and went to about 34 lbs to 38 when I was using ankle weights, got my own steel 119 tank.

Now, I am diving a DSS Torus wing (sounds like the same one you have) with an AL backplate on a Scubapro XTec harness. I use a DUI weight harness. Still drysuit, with lots of lofty undergarments because I hate being cold, neoprene socks and overshoes. Steel 119 tank. If I go to fresh water, I usually take 6 lbs off and that seems about right. If I go to an AL 80 tank then I add about 6 lbs to compensate for positive buoyancy of the tank at the end.

I don't know if that helps, but I thought it might be useful to you. The DSS guy, Tobin, is an expert on weighting. Don't hesitate to call them and ask for some advice too, when I called I got more info than I remember now, but he was a great wealth of knowledge!

Now, if I could just take 26 lbs off my ass as easily as it comes off of my harness!