scuba-charters:
swimmers do that too??? I thought it was just me...
Question on streamlining
- Thread starter Matsya
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swimmers do that too??? I thought it was just me...
I swam all four years of Highschool back in the "good ole days." I shaved down and even though I had a very tight hair cut wore a cap. I even put a little baby oil on.
I am not that streamlined when I dive as I have various equipment hanging off D-Rings.
However I mostly drift dive. When I am actually fin kicking I hug all this crap in close and find I move much easier than just letting my dingles dangle.
When I wreck dive I leave this crap on the boat and get everything pulled in tight. I know this Different Rig / Different dive is probably not DIR but I am not a DIR diver.
Streamlining is worth the effort to rig your stuff in.
I am not that streamlined when I dive as I have various equipment hanging off D-Rings.
However I mostly drift dive. When I am actually fin kicking I hug all this crap in close and find I move much easier than just letting my dingles dangle.
When I wreck dive I leave this crap on the boat and get everything pulled in tight. I know this Different Rig / Different dive is probably not DIR but I am not a DIR diver.
Streamlining is worth the effort to rig your stuff in.
all4scuba05
Contributor
Am I to understand that a tank moving horizontally through water creates more drag than one clipped to your chest D-ring?
ScottB
Contributor
Would depend on how much of an angle that one clipped to the chest D-ring is at.. If it's presenting a larger frontal area.. then it will probably have more resistance..
However if it were in true side-mount form.. where it is tucked into your armpit and the tank lies horizontal in the water.. then part of the frontal area on the tank is obscured by the the frontal area your arm is taking up, reducing your required effort a little..
Keep in mind weight too.. Newton's law butchered by me again.. Heavy things that are stopped want to stay put, heavy things that are moving want to keep moving in that same direction. It's a pain to start pulling heavy things through the water.. but its even more of a pain to climb back up on the boat and/or walk up the shore
However if it were in true side-mount form.. where it is tucked into your armpit and the tank lies horizontal in the water.. then part of the frontal area on the tank is obscured by the the frontal area your arm is taking up, reducing your required effort a little..
Keep in mind weight too.. Newton's law butchered by me again.. Heavy things that are stopped want to stay put, heavy things that are moving want to keep moving in that same direction. It's a pain to start pulling heavy things through the water.. but its even more of a pain to climb back up on the boat and/or walk up the shore
dumpsterDiver
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water is a lot more than 30 times as dense as air.. I think it is around 800 times more dense..
Friction (drag) increases as a function of the velocity squared.. double the speed; 4 times the drag.
Being streamlined is important, but moving fast in any configuration will use up alot of energy.
Friction (drag) increases as a function of the velocity squared.. double the speed; 4 times the drag.
Being streamlined is important, but moving fast in any configuration will use up alot of energy.
PerroneFord
Contributor
Yes, I messed up the numbers. Thank you for the correction (and thanks to those of you who corrected me via PM ).
).
PerroneFord
Contributor
all4scuba05:
Absolutely. The one under your armpit rides in the slipstream created by your shoulder. The one on your back cuts its own swatch through the water. If you ever get the chance to try you, you'll understand. It's very noticeable.
PerroneFord
Contributor
The drag created by the legs being vertical isn't as bad as might be thought simply because the tanks are pushing aside some of the water for the legs to pass through. That said, the frog kick, when done properly, is very powerful, but allows a LONG push stroke with the fins and allows the diver to glide for a period of time. Thus it keeps the heart rate and respitory rate down.
It's like riding a bicycle versus jogging. When you jog, every footfall propels you a bit further, but with a bicycle, you can pedal and coast, pedal and coast...
It's a terrific stroke to use when dving. It also facilitates stopping in midwater, backing up, and turning around, all without changing leg position.
It's like riding a bicycle versus jogging. When you jog, every footfall propels you a bit further, but with a bicycle, you can pedal and coast, pedal and coast...
It's a terrific stroke to use when dving. It also facilitates stopping in midwater, backing up, and turning around, all without changing leg position.
del_mo:
Matsya:
I don't care about drag, I do it to enhance my dive experience. Part of the enjoyment of diving for me is to feel like I sprouted gills and that I am just swimming with the fishes. The more I feel like I am in some sort of constrictive space suit, the less enjoyable it is for me. So when I go down, I want the bare minimum that I feel comfortable with me.
When I see those pictures of people in dry suits and hoods and 17 tanks strapped to them forming a cage around them it makes me think why? Just as I am sure that there are tons of people that look at my diving choices and end up scratching their heads as well, which is fine. Diving is a personal thing.
Packhorse
Contributor
They do it to reduce drag. some people do it because they like drag.cancun mark:swimmers do that too??? I thought it was just me...
:lol:
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