Salt VS fresh

[Doc]

(all other factors being the same

But they're not.

If you wear the same thermal protection in fresh as you would in salt, you're likely about to freeze your tootsies.

The temperature will be different, you'll want a thicker suit, maybe a hood and booties, you'll be more buoyant. If not, you'll be cold.

Advice? The only real solution is logged experience and that "time wasting" pre-dive weight check. Ahh, the passing momentary embarrassment of doing that process right there in front of the cool kids. It will be o.k., just go and learn.

Report back, maybe there is an equation that PADI can issue a patch for.

... .. .....__[:]@

 

[BlueTrin]

But they're not.

If you wear the same thermal protection in fresh as you would in salt, you're likely about to freeze your tootsies.

The temperature will be different, you'll want a thicker suit, maybe a hood and booties, you'll be more buoyant. If not, you'll be cold.

Advice? The only real solution is logged experience and that "time wasting" pre-dive weight check. Ahh, the passing momentary embarrassment of doing that process right there in front of the cool kids. It will be o.k., just go and learn.

Report back, maybe there is an equation that PADI can issue a patch for.

... .. .....__[:]@

I am pretty sure someone could come with a more precise equation if you include your body fat percentage.

I think it would explain a lot of discrepancies between people of same weight. But then I don’t think most of people would know their own body fat %.

 

[Gareth J]

This has been an interesting read.

Being inland, rather than on the coast. Training dives are generally done in one of two inland facilities close to me.
One hard rock quarry, one clay pit. Funnily enough, I avoid the clay pit as much as possible.
Proper dives, are coastal.

Because, we generally wear the same kit for fresh and sea water dives. The only changes being seasonal additions or reductions to our thermal protection. The basic rule is add 4lb (2kg) for salt water.
The best rule is actually do a proper weight check!

It should be noted that the salinity of the water effects the amount of additional lead required.
(English channel is 3.4%, the Red Sea about 4%)

 

[Doc]

It should be noted that the salinity of the water effects the amount of additional lead required.
(English channel is 3.4%, the Red Sea about 4%)

This is covered on Day #108 in the BSAC (oh-so-very British Sub Aqua Club) training system, but PADI only lets these secrets out during the Rain Man Distinctive $pecialty Course. (Referred to by BSAC as M.U.P.P.E.T., Mentaly Unstable People PADI Eventually Trains)

Knowing this would explain why Brit Divers can be identified by their unwavering carry of a "spanner", a very BSAC style of non-ditchable weight.

Note also the masses of them crammed onto the double-decker aircraft making the trolley run from London's Heathwick Aerodrome to Camelburg...they're carrying a full extra gram of lead weight. The BSAC system delves into a full discussion on Day #213 as to whether it's proper to cabin carry it or check it in baggage. Until you complete that, you have to sit on the shore, waiting, clutching the rope, whereas a PADI student has enough patches and chevrons that they have added sufficient extra weight and compensate buoyancy by inhaling or exhaling.

Either system works.

 

[Gareth J]

Doc

I was slightly surprised how small the mathematical difference is between the Atlantic and Red Sea. Which seems in contradiction to real world experience!

You know what they say about PADI divers and BSAC divers on a sinking boat?
The PADI instructor tells his divers to get their credit cards out to pay for the wreck speciality course.
The BSAC instructor says, get your gaffer tape out and lets fit the boat

Gareth

 

[Doc]

BTW, to the less travelled masses... the British "gaffers tape" is what Muricans have been led to believe is "Duck Tape". But, you can use British Gaffers Tape underwater for boat repairs, just like they use it for General Dentristy.

You know what they say about PADI divers and BSAC divers on a sinking boat?
The PADI instructor tells his divers...

Only if it's sunk in less than 60fsw, otherwise they'll need AOW first.

 

[tursiops]

BTW, to the less travelled masses... the British "gaffers tape" is what Muricans have been led to believe is "Duck Tape". But, you can use British Gaffers Tape underwater for boat repairs, just like they use it for General Dentristy.



Only if it's sunk in less than 60fsw, otherwise they'll need AOW first.

Jeez, even if you trying to be funny or sarcastic, get your facts right. It is Duct not Duck, and duct tape and gaffer's tape are two different products, with different adhesives.

 

[dberry]

Jeez, even if you trying to be funny or sarcastic, get your facts right. It is Duct not Duck, and duct tape and gaffer's tape are two different products, with different adhesives.

Bzzzztttt!! Actually it WAS originally called Duck Tape, as it was made from durable Duck Cloth. It was developed for the military in WWII to waterproof ammo boxes, repair boots, etc. HVAC applications came post-war.

 

[tursiops]

You are right....75 years ago. Today "Duck" is the brand name of one of several duct tapes. It is not waterproof, of course, so wouldn't work to hold the ship together, and gaffer's tape would be worse.

Bzzzztttt!! Actually it WAS originally called Duck Tape, as it was made from durable Duck Cloth. It was developed for the military in WWII to waterproof ammo boxes, repair boots, etc. HVAC applications came post-war.

 

[Doc]

Thanks, Turkytops, I like my ducts in a little roe.