Misconceptions and Fallacies

[Temple of Doom]

It isn't the act of overweighting that affects your air consumption it factors come about due to compensating for the overweighting.

Ha! Ok I suppose you're right. It isn't overweighting that causes your consumption to go up.

It's trying not to drown while being overweighted that causes your consumption to go up. :thumbs_up:

Craig

 

[scubatexastony]

....you're diving salt water and you pre- fill your bladder, (NO, the BC!) with fresh water, then you would effectively increase your lift around 1.6lbs per gallon! so next time you rinse that bugger....

 

[The Kraken]

Toooo funny !!!!!

the K

 

[knotical]

http://www.scuba-doc.com/myths.html

 

[Stu S.]

Here's one:

"Split fins have the unique ability to compress water. This creates a layer of compressed water behind the diver, and a "water vacuum" in front of the diver. Besides the powerful finning action, the diver is being pushed ahead by this compressed water into a zone of lower density. It allows you to go twice as fast."

 

[roakey]

Here's one:

"Split fins have the unique ability to compress water. This creates a layer of compressed water behind the diver, and a "water vacuum" in front of the diver. Besides the powerful finning action, the diver is being pushed ahead by this compressed water into a zone of lower density. It allows you to go twice as fast."

OMG. Source?

Roak

 

[rockjock3]

Whether you realize it or not, you are both saying the same thing....

We are stating the same end state (water in your BC decreases available lift), but getting there in different ways.

I said that water in your BC decreases you lift by reducing the usable volume that you have to fill with air, and this has nothing to do with the weight of the water but how much volume it takes up.

He said that the weight of the water is directly correlates to your reduced amount of lift, so that 5 lbs of water accounts for 5 lbs less lift.

In the end the result is the same and that is that water in your BC can eventually reach a point that it will decrease your available lift.

 

[Temple of Doom]

He said that the weight of the water is directly correlates to your reduced amount of lift, so that 5 lbs of water accounts for 5 lbs less lift.

If you've got 5lbs of water in your BC, then that's the same water that would be outside your BC (assuming both fw or sw). It's 5lbs of water that will not be displaced by filling your BC. Therefore 5lbs of water in your BC is 5lbs less displaced at max fill (to a dozen or so significant figures after subtracting the weight of air).

If you can't fill up the space in your BC that 5lbs of water occupies, then you're going to displace 5lbs less possible lift.

Craig

 

[The Kraken]

Keeps you from doing an uncontrolled ascent! Less lift.
New instructor method of weighting.

the K

 

[rockjock3]

If you've got 5lbs of water in your BC, then that's the same water that would be outside your BC (assuming both fw or sw). It's 5lbs of water that will not be displaced by filling your BC. Therefore 5lbs of water in your BC is 5lbs less displaced at max fill (to a dozen or so significant figures after subtracting the weight of air).

If you can't fill up the space in your BC that 5lbs of water occupies, then you're going to displace 5lbs less possible lift.

Craig

I see now. I was thinking all wrong about it. It is the weight of the amount of water that would/will be displaced by the air you put in your BC.