Do Cold Water Regs Need Fins? - Scuba Tech Tips: S17E11
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- čas přidán 29. 05. 2024
- A viewer's letter got "The Talent" thinking about the use of "warming fins" on regulators. Alec explains why "warming fins" on the 2nd stage is creative marketing but does not prevent a regulator freezing-up and free flowing.
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I've been watching you vids for years and I always love your non judgemental simple explanation. Informative enough to either make our own decision or giving us a direction to investigate further. 👌🏼
I appreciate that! Other channels exist to sell stuff or get a commission whey you buy stuff. I'm not interested in any of that, just good info along with some laughs.
A
You’re explanation about letting the air out of the tank from high pressure to a lower pressure is the air conditioning principle 😊
You are correct. Look for my video on Why my Regs freeze to see it explained with a fridge overview.
A
fins is a technique to increase the surface of contact between a solid body and heat transfert fluid.
This is used specially when the heat transfert capacity by surface unit of the transfert fluid is the limiting factor, so the contact surface is increased by adding fins.
This is very often used when a metallic body have to be cooled by surrounding air and a very common application is to cooling cylinters and heads on an air cooled engine.
when a heat receptive media as water is involved, fins are not required and even can become a nuisance to efficient cooling as the surfaces corrodes.
excellent topic
excellent video.
Glad you like it Jacques. Lots of science experts commenting.
A
Water can indeed go below 32F; impurites such as the salt in sea water depress the freezing point to around 28F, which is why they salt the roads. But a free flowing reg can get down to below 20 pretty easily and the best way to avoid freezing is to use a sealed first stage reg that doesn't let water get into the working parts. Then the second stage is the vulnerable part, so we just avoid purging when not in the water, especially as in winter the air can be a lot colder than the water. I agree, fins are mainly for style.
I did several videos on cold water diving/gear and free flows. I never had a winter ice dive free flow following my tips. Once we did a test using the opposite steps and students saw how it free flowed as soon as it went under.
A
Alec, a better experiment for an adibiatic phenomenon is much simpler.
With an open mouth, gently blow air on the back of your hand. It'll feel warm.
Now try it with pursed lips and slightly more pressure. It'll feel much cooler.
Air is the same temperature and coming from the same place.... But a drop in pressure is a drop in temperature.
Nice explanation, thanks.
A
Interesting concept! I just noticed that my G260 has the same fins on it. Good to know they don’t really do anything lol. Paired with the MK 17 Evo, I dive exclusively cold water here in Alaska and have not had a free flow yet. Thanks for the video Alex.
Just. Go. Diving.
You're welcome and enjoy those warm Alaska waters! No for these bones anymore.
A
but but but my 45 year old Dacor Pacer 900's from 1979 have never ever frozen up while diving in the winters and still work like brand new and they don't have those fancy fins ! Ha Ha Ha
Ha funny how Dacor never used heat fins, because their design worked.
A
2:44 i think it's pronounced ah-dee-ah-bah-tic
Just my Canadian accent I guess.
A
👍😎🤿🇵🇭!
Thank you.
A