The defining aspect of Submarines, has always been stealth. From the first human powered submersible to the latest nuclear-powered subs, the effectiveness of these underwater vehicles is based on not being detected. Once a sub is hidden beneath the waves, its next best tactic is to remain quiet. If a submarine cannot be seen or heard, then it can’t be found, attacked and destroyed.

A new type of technology might currently be in development by China, that could lower the acoustic signature of submarines. In a traditional submarine, a propeller is attached to a driveshaft which is turned by a large engine or hydraulic system. These types of systems rely on a great deal of machinery and moving parts, both create lots of noise in an environment where stealth rules supreme. 

In the "Silent Service", making as little noise as possible to evade detection is always the goal. To that end, a new concept in propulsion called a “Rim-Driven Propeller” or RDP (also known as a Rim-Driven Thruster or Rim-Driven Pumpjet) is being considered. An RDP removes the hub, driveshaft and gearbox from a submarine’s typical propulsion system, thereby giving the sub even greater stealth.

As another year draws to a close, you might be wondering what amazing new technology the next year will bring. Well, there is already something fresh for you to try: a surprising new type of underwater vehicle that will allow almost anyone to experience driving underwater in a safe and immersive environment, while still being able to feel the water and sea life around you. Imagine hopping into a car and driving under the sea among tropical fish, natural reefs, or even around a simulated Lost City of Atlantis. This newly developed car will be available this year and will let people share underwater experiences together that were once only available to those with Scuba training.

Finding the right gasket material for sealing critical applications can be a challenge. Before engineers can even begin to think about installing and testing a new gasket, they face the critical responsibility of selecting a material that can withstand a range of operating temperatures and pressures, harsh environmental conditions, and yet is flexible enough to achieve a proper seal without failure. It is not an easy task.

As mechanical engineers push the limits of what systems can achieve, the demands put on all component parts also increases. Traditional parts made of metal, plastic, or rubber simply cannot keep pace with the demands of modern defense or industrial applications. Even in existing applications, parts are expected to last longer and reduce replacement costs. Few other gasket applications are as critical as having fail-safe gaskets on an underwater vehicle.

What's cooler flying drones? Intelligent underwater robots!

While high-flying drone vehicles have been in the news quite a lot this year, a new generation of stealthy underwater drones have gone through an amazing evolution. Underwater robots, also known as Unmanned Underwater Vehicles or UUVs, have been around for a while. UUVs are basically any vehicle that's able to operate underwater without a human on board. Some UUVs need a human to directly control them, and are aptly named Remotely Operated underwater Vehicles or ROVs. However, a new generation of intelligent unmanned underwater vehicles are now available. Known as Autonomous Underwater Vehicles or AUVs, and they have allowed us to  explore the mysteries under the sea, as no other underwater technology to date.

Engineers are tasked with selecting the perfect material for your gasket application. Each part must be able to withstand the task at hand, including operating temperature and being flexible enough to maintain a proper seal throughout the process. 

As we discussed in our last blog, engineers historically chose asbestos because it served a myriad of important functions; it was durable, able to handle high temperatures and parts-handling, and relatively affordable. Unfortunately, it was also linked to mesothelioma, an invasive and often fatal type of lung cancer. Once it was pulled off the market, workers had to find an alternative for their gasket solutions.

As the engineer responsible for ensuring the performance and safety of sealing components, there can be quite a lot of pressure riding on making the proper material selection for a specific application. Before you even begin to think about installing and testing a new gasket, you are tasked with the critical responsibility of selecting a material that is compatible with the surrounding environment, can withstand the operating temperature and pressure, and is flexible enough to achieve a proper seal.