A question

[Exkingsmeadchef]

That I'm sure is a dim one but has been posed on a nonn diving forum and as non divers we don't know the answer ...so be gentle lol.

We have recently watched the video of the chap doing the record "constant weight no fin freedive" in Dean's hole.(AMAZING)
It was noted that even with lungs full of air he was able after some breast stroke movements to then go into whats seems a very fast decent with very little effort. How is this possible?
We can see how this would be possible if his weight was neutral or even over weighted ...but it's not....is it?
Does it have anything to do with the pressure at depth?

I did warn you it would be a silly question.

 

[beconfly]

It has everything to do with pressure at depth. Remember that density is equal to mass/volume. When he is positively bouyant, his density is less than water, and when he is negatively bouyant his density is greater than water. His mass certainly didn't change while decending, but his volume did. That is because the air in his body (primarily in his lungs) gets compressed with increasing pressure.

At ambient air pressure of 1ATM, lets say he has 8 liters of air in his lungs. At a depth of 10 meters, the pressure on his body has reached 2ATM, and therefore the air in his lungs has gotten squeezed to occupy only 4 liters. At 30 meters depth, pressure has reached 4 atm, and the air in his lungs occupies only 2 liters.

You can see where this is going... his volume has decreased at some depth to the point where his total body density (mass/volume) has increased enough to be sufficiently negatively bouyant so that he can stop swimming and just sink down without effort.

 

[Exkingsmeadchef]

Thank you.
We/I thought as much, but just could not put it quite so succinctly.
You are a Gentleman and a Scholar......I shall now leave you all in peace.

 

[devondave]

Thank you.
We/I thought as much, but just could not put it quite so succinctly.
You are a Gentleman and a Scholar......I shall now leave you all in peace.

You can't leave . . . it's forbidden . . . your one of us now . . . join us Chef, join us.

 

[Exkingsmeadchef]

You can't leave . . . it's forbidden . . . your one of us now . . . join us Chef, join us.

OK ....BUT...if I'm staying I'm not mucking about so I have just ordered my "Free Dive Starter Pack" online ...should be here for a weekend dive sesh.....









My elite training area......

Oh and I don't like it up my snozz.

And trust me when I say I make these look good..........ish.




P.S. where can a I buy a waterproof Pedometer(that looks so wrong written down)as I figure that with the circumfrance of the pool being 3m that 34 times around the tree will be just over 100m and that is a record is it not?

 

[Dr.Clean]

P.S. where can a I buy a waterproof Pedometer(that looks so wrong written down)as I figure that with the circumfrance of the pool being 3m that 34 times around the tree will be just over 100m and that is a record is it not?

100m depth is a lot different than 100m dynamic. Let's think about it, chef. You swim down 100m. What happens when you get down there? Gotta come back up, right!?!?!? So you would have to at least do 200m dynamic in order to have any kind of shot at that title. There's a ton of other factors such as equalizing. And, I believe the record may be slightly over 100m. I could be wrong though. Someone on here would know the answer, though.

 

[beconfly]

I would be happy to give him the title of the world record holder for maximum number of times around the dora the explorer pool.

But... dynamics record with fins = 265m, without fins = 218m, depth record with fins = 124m, without fins = 95m.

 

[Exkingsmeadchef]

I would be happy to give him the title of the world record holder for maximum number of times around the dora the explorer pool.

But... dynamics record with fins = 265m, without fins = 218m, depth record with fins = 124m, without fins = 95m.

GET IN!!!!
I have just added the fact I hold the "times around a Dora explorer pool"* record to my CV!!!!
Phoned my mum and she is very proud.......the wife on the other hand just looked at me shook her head and poured herself another G&T.





*Do you want me to contact the Guiness book of records or shall I leave that to you?

 

[beconfly]

I'll make the call, but before I do I think you need to post up the video documentation of the event for all of us to witness!