GEAR & TECH

Here's the science behind how submarines dive and resurface

Let's start with the basics: Ships stay afloat because the weight of the water that it displaces equals the weight of the ship. As gravity pulls down on the ship; water creates an opposite upward force called buoyant force, which prevents the ship from sinking.


Related: 27 incredible photos of life on a US Navy submarine

Submarines use ballast and trim tanks, which are filled with air or water to submerge or raise the ship. When the submarine is floating on the surface, the tanks are filled with air causing its density to be less than the surrounding water. When the submarine dives, the tanks are flooded with water causing its density to be greater than the water causing it to sink.

Science Channel, YouTube

Some submarines use two hulls—one inside of another—instead of ballast tanks. This design allows it to flood the outer hull with water, which causes the vessel to sink, while the crew work and live in the inner one. An example of a double hull design is the Russian Alfa Class submarine considered by many to be the hot rod sub of the Cold War for its incredible speed. Designed during the 1960s, the Alfa Class submarine remains the fastest of its kind till this day, according to Foxtrot Alpha.

As the outer hull fills with water, the submarine dives.

Brit Lab, YouTube

As the water is replaced by air, the submarine resurfaces.

Brit Lab, YouTube

This video shows how American submarines dive and resurface using its ballast tanks:

Science Channel, YouTube

4 critical components to the success of the first total penis transplant

The procedure was performed on an Afghanistan war veteran wounded by an IED

Doctors at the Johns Hopkins University School of Medicine in Maryland announced the first-ever successful total penis and scrotum transplant was performed on an Afghanistan veteran recently. The recipient was wounded in an IED attack that left him without sexual or urinary function but left his internal organs unharmed.

The procedure was performed on March 26th and the unidentified "sergeant" will have urinary function by the end of the week.

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Articles

How R. Lee Ermey's Hollywood break is an inspiration to us all

While there have been many outstanding actors and celebrities who have raised their right hand, there has never been a veteran who could finger point his way to the top of Hollywood stardom quite like the late great Gunnery Sergeant R. Lee Ermey.

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GEAR & TECH

Marines used a 3D printed F-35 replacement part for the first time

Marines with Combat Logistic Battalion 31, 31st Marine Expeditionary Unit, are now capable of "additive manufacturing," also known as 3-D printing.

This innovative process uses 3-D printing software to break down a digital model into layers that can be reproduced by the printer. The printer then builds the model from the ground up, layer by layer, creating a tangible object.

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History

The 'indomitable determination' of John Paul Jones lives on in the Navy

April is a great month to remember the namesake of one of our Pearl Harbor guided-missile destroyers, USS John Paul Jones, named for a founding hero of our Navy and proudly known by the crew and their families and friends as "JPJ."

On April 19, 1775, the Battles of Lexington and Concord lit the match of Revolution against British tyranny. At the time Great Britain had more than 250 warships with nearly half having 50 or more guns – cannons. Our tiny naval force consisted of a few ragtag privateers and some humble sailing vessels. Even before our nation began, the founders commissioned 13 frigates and recruited warfighters, including immigrants like John Paul Jones.

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Articles

This is how the 'missing man formation' honors fallen pilots

The first time I witnessed a 'missing man formation' was at the funeral of my grandfather, who flew the B-25 Mitchell during World War II. After his service in the Army Air Corps, he became a commercial pilot for TWA and then ventured into private flight. He died in an airplane crash at the age of 74 and my family gathered with his aviation community at Santa Paula Airport for his memorial.

At the ceremony, we looked to the sky as a group of planes from the Condor Squadron flew overhead. One of the planes banked away, leaving an empty space in the formation.

The symbolism was not lost on me.

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Veterans

This Army vet started a supplement company dedicated to education

Before John Klipstein joined the Army, he smoked a pack a day and his PT test run time was roughly 23 minutes — which accounts for the time spent throwing up on the side of the track. The military turned that around. The newly-minted 13B found a love for fitness and pushing his body to the limit. After leaving the military, he developed a line of supplements to help others do the same — safely.

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Taiwan is ready to push back against China's aggression

Tensions between the Peoples Republic of China and Taiwan have recently flared up as China held the largest show of naval force in its history in April 2018, and made new threats directed towards Taipei.

"We would like to reaffirm that we have strong determination, confidence and capability to destroy any type of 'Taiwan independence' scheme in order to safeguard the country's sovereignty and territorial integrity," Ma Xiaoguang, a spokeswoman for the State Council's Taiwan Affairs Office, recently said.

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GEAR & TECH

The president is getting a new Marine One after almost 60 years

Marine One is an icon of the presidency and for the most part, one helicopter has carried that load for almost 60 years: The VH-3, which first carried President Eisenhower in 1961. The current D model of the VH-3 entered service in 1978 and was later backed up with the introduction of the VH-60N in 1987. But, the fact remains that both of these helicopters are getting older by the day.

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