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#1
March 26th, 2007
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Hi
Im tryin du figure out a math. formula to use, when people ask how much weight they need when freediving (as a part of some school work).... But i need some data to base the calculus on, and that is why i ask for your help! I need some data from your dives. It is important that only people who's using af full body suit answer the questions (not shorty!) 1. Suit thickness in mm. 2. Salinity of the water (choose between "freshwater", "brackish water", "salt water" and "Very salty water") 3. Your percentage of fat (if unknown or confidential just choose between "atletich", "normal","chyppy" or "overweigthy") 4. The depth at which you were neutral (approximately) 5. The amount of weight used It would be nice if you guys post data from several dives... Like in my case(look down)... DIVE1 1. 5 mm 2. Salt water (red sea) 3. 15 % 4. 15 meters 5. 4 kilos DIVE2 1. 5 mm 2. Fresh water (lake) 3. 15% 4. 8 5. 3 kilos Im looking forward to work with the data. I'll let you know if i find some meaningful result ;-) Best regard... ------------------------------------------------------------------------------------------------------------ ...After the first posts i wrote this ------------------------------------------------------------------------------------------------------------ Nice.... Keep up the the good work... The more data the better the formula will be (if there will be af formula ;-)) At first i'll try using the data from 1-5... But for the those who like to give more information let's set op the following 6. Choose between "Light packing","Medium packing","Maximum packing" 7. Neoprene density ("normal", "high") 8. Lung capacity (would be without packing) Last edited by bemula55; March 27th, 2007 at 05:49. 
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#2
March 26th, 2007
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I think that total lung capacity is an important data too...trained people will be more buoyant than a non trained one....my 0.0025 cents
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#4
March 27th, 2007
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Temperature, type of rubber, salinity, position(for lung expansion), body density and even how fast you descend; I think that there are too many variables to get good information.
1 3mm 2 1.024 SG (standard sea water I think) 3 25% 4 15m 5 2.25kg Aloha Bill
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Aloha Bill A man is wise, only to the extent that he is aware of his own ignorance. Bill Bonner '08
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#5
March 27th, 2007
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Sorry...
1. 7 mm 2. salt water 3. 5% ( aprox ) 4. 15 meters 5. 8 kilos Keep thinking on variables...weight...height...type of neoprene (high, low density ) i hope you can find something useful
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Re: Some weight data
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#6
March 27th, 2007
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Nice.... Keep up the the good work... The more data the better the formula will be (if there will be af formula ;-))
At first i'll try using the data from 1-5... But for the those who like to give more information let's set op the following 6. Choose between "Light packing","Medium packing","Maximum packing" 7. Neoprene density ("normal", "high") 8. Lung capacity (would be without packing)
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#7
March 27th, 2007
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Here ya go
1. 5mm. 2. salt water 3. chubby 4. 8m 5. 9kg 6. Light packing 7. normal, opencell suit 8. unknown
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Dive safe and shoot straight - Hénré - ------------------------------------------------------------------------------------------------------ "Thinking is the hardest work there is, which is probably why so few engage in it" - Henry Ford -
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#8
March 27th, 2007
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one piece 5 mm
salt water [adriatic sea] 25% i guess [170 cm with 93 kg, see avatar  ]15 m 9 kg of led i have no speciall training in freediving, but i dive since I was 6....somehow I fit in the water.... Last edited by vali; March 27th, 2007 at 08:48.
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#9
March 27th, 2007
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1. Suit thickness in mm.
6mm torso and hood, 5mm arms and high-waist pants 2. Salinity of the water (choose between "freshwater", "brackish water", "salt water" and "Very salty water") freshwater 3. Your percentage of fat (if unknown or confidential just choose between "atletich", "normal","chyppy" or "overweigthy") Athletic 4. The depth at which you were neutral (approximately) ~14m 5. The amount of weight used 3kg 6. no packing 7. medium density heiwa 8. Don't know. Above average, I'd assume. Any results so far? I'd sure like to see what You come up with. This has been a topic many times here..
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#10
March 27th, 2007
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Hi Sanso
So far i havent startet yet ;-) I'll like to have at least 30 datarecords before i try to estimate anything. Remember that it okay to post more dives for the same diver! I guess most of us have at least af weigth for freshwater and one for saltwater, and some people migth even have several suits.... That makes four datarecords (fresh/3mm,fresh/5mm,salt/3mm,salt/5mm) So freedivers, keep it coming ;-)
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#11
April 3rd, 2007
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Hmmm...
Not much help to get in here (but thanks to you few guys responding  )I have to say that the formula under here is not quite good, but its the best i can get with the data i have recieved. W=2.186 x MM + 81.0 x DENS + 0.2468 x FAT - 2.129 x ln(DEPTH) - 87,4 where W: The amount of weight needed(in kg) MM: Thickness of fullbody suit in mm. DENS: Density of water (1.000 for fresh water, 1.027 for "normal" saltwater... so have a guess i you don't know the actual data of your water) FAT: The fat-percent of your body ln(DEPTH): The natural logarithm (LN) to the depth (in meters) at wich you want to be neutral. An example: 5 mm. suit, with af fat percent on 15 % , diving on normal oceanwater (salt). The diver want to be neutral at 15 meters. W=2.186 x 5 + 81.0 x 1.027 + 0.2468 x 15 - 2.129 x ln(15) - 87,4 W=10.93 + 83.187 + 3.702 - 5.765 - 87.4 = 4.65 kg
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#12
April 4th, 2007
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be patient, I'll try to supply some more data.
But big ups for this thing. You could post something in the Beach Bar pointing here? That might get a couple of people to contribute. P.S.: Have You included beans into Your calculation? 
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