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US Navy SEALs Combat Swim

chicchorea says...

Wikipedia
"The combat side stroke is a relaxing and very efficient swim stroke that is an updated version of the traditional sidestroke. The CSS is a mix of sidestroke, freestyle and breaststroke. The combat side stroke allows the swimmer to swim more efficiently and reduce the body's profile in the water in order to be less likely to be seen during combat operations if surface swimming is required. The concept of CSS has been that it can be used with or without wearing swim fins (flippers), the only difference being that when wearing swim fins the swimmer's legs will always be kicking in the regular flutter kick motion without the scissor kick. This stroke is one of the strokes that can be used for prospective SEAL candidates in the SEAL physical screening test (PST), which includes a 500-yard swim in 12 minutes 30 seconds to determine if the candidate is suitable to go to the Basic Underwater Demolitions/SEAL school.

Basics

The combat side stroke utilizes the three main fundamentals of swimming:

Balance: There are two things that affect your balance in the water - the head and lungs. Most people when swimming, especially when using breaststroke, will swim with their head up[citation needed] which forces their hips to sink down which is like they are swimming uphill and is a sign of being less comfortable. However, if the body is flat/horizontal or more parallel to the water-line it is far more effective and will allow the swimmer to feel more comfortable in the water.
Length: The taller the person is, the faster the speed through the water. As a result, it is important that the swimmer is fully stretched horizontally in the water, as this will reduce the body's drag through the water and allow a higher speed.
Rotation: In most sports, such as baseball, when the batter swings the baseball bat they will rotate the hips to increase the power of the swing. The same principle is applied to swimming. If the swimmer engages the hips and uses the body's core muscles it will increase power."

You rather nailed it.

SFOGuy said:

Clueless question; this style of swimming because it's really energy efficient? Because it makes less wake and is stealthier? Because it's harder to hit someone swimming like this in the water with gunfire?

Sorry, I'm not sure why they settled on this stroke...He says faster and more efficient---but---any engineers/biomechanics/hydrodynamics folks who tell tell me why?

Human Sonic The Hedgehog >>>>>>>>>>

shoany says...

Wouldn't it actually be easier if he maintained exactly 8.65mph (ideally) in the run-up? If he's going any faster, then he'd just be fighting his own linear momentum as soon as the incline started, being that he's not a rolling wheel or ball and instead relies on stationary foot placement and pushing to move. On the other hand, once the direction starts changing you'd have to pump really hard to maintain speed.

I would also imagine he needs to engage his core muscles to keep from folding forward; my understanding is that there would be a significant "outward" force generated, which in this case keeps him on the track, but does so by pushing him against it.

shatterdrose said:

Objects in motion yadda yadda. His 18mph is going the wrong direction once he starts up the ramp. And it requires a lot of strength to force his body mass to alter direction through a 360° turn. A car is long and compresses on a wheel. A human body is tall and compresses on the mechanism moving it forward, negating it's own ability to move "forward".

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