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Ucarkus

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To comment on the side conversation, going fast is not efficient. Efficient is going the farthest on a fixed amount of gas or going the same distance using less gas. Given that force is relative to the square of velocity, going the fastest can not be the most efficient method.
Well freedivers dive 100m with 1 breath (that is 200m and have to fight against buoyancy as well in the first half), so it is clear who is more efficient based on your criterion :cool:.
 

jvogt

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Well freedivers dive 100m with 1 breath (that is 200m and have to fight against buoyancy as well in the first half), so it is clear who is more efficient based on your criterion :cool:.
Agree, but they are not going as fast as they possibly can either. They find the optimum pace to utilize the gas at hand.
 

Ucarkus

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Agree, but they are not going as fast as they possibly can either. They find the optimum pace to utilize the gas at hand.
Rule of thumb is 1ms (200sec to dive 100m and back) that is 3.8 kmh, a healthy pedestrian walks 5kmh, I would say that is pretty fast. You are limited at the time you can hold your breath, so, they cannot be slow.
 

Wibble

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Rule of thumb is 1ms (200sec to dive 100m and back) that is 3.8 kmh, a healthy pedestrian walks 5kmh, I would say that is pretty fast. You are limited at the time you can hold your breath, so, they cannot be slow.
And the rest of us evolved a brain that made the S.C.U.B.A. and we can spend hours underwater.
 

johndiver999

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Well freedivers dive 100m with 1 breath (that is 200m and have to fight against buoyancy as well in the first half), so it is clear who is more efficient based on your criterion :cool:.
The challenges of buoyancy for those freedivers is not the first half of the dive. You pretty much got things backwards, FYI.

Also, lots of advice about the intensity of narcosis at 130 or 150 ft, is not applicable to everyone. Some people can function well and suffer from little or no impairment at those depths on typical dives.

Just think how buzzed those freedivers are at 100 meters!
 

Ucarkus

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The challenges of buoyancy for those freedivers is not the first half of the dive. You pretty much got things backwards, FYI.
Nope, that depends on the athletes strategy and strengths. Most of them will choose depending on their strategy, first or second part. But it is true that it is not limited to first half.
 

Marie13

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Also, lots of advice about the intensity of narcosis at 130 or 150 ft, is not applicable to everyone. Some people can function well and suffer from little or no impairment at those depths on typical dives.
Better for the info to be out there about how bad the narc can be, rather than the just the divers who insist they’re not narced at all at 150-160ft on air.
 

johndiver999

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Better for the info to be out there about how bad the narc can be, rather than the just the divers who insist they’re not narced at all at 150-160ft on air.
I agree, some people have trouble at 120 and others seem to do 180 without too much drama. As best I can tell, it is a personal thing and progress needs to be slow and progressive. Those costs for helium seem crazy.
 

Marie13

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I agree, some people have trouble at 120 and others seem to do 180 without too much drama. As best I can tell, it is a personal thing and progress needs to be slow and progressive. Those costs for helium seem crazy.
That’s why you really have to go CCR. It’s not just cost. Availability is a real issue, regardless of how much people in FL may deny it.
 

johndiver999

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Nope, that depends on the athletes strategy and strengths. Most of them will choose depending on their strategy, first or second part. But it is true that it is not limited to first half.
The freedivers are way heavy for probably 75% of their dive and hint... going down isn't the challenge on a 100 meter dive.
 
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