Transportation

I would like to know how airplanes can fly upside down and do loops. How does the fuel get to the engine if the plane is upside down?

Thomas the Tank Engine is a merchandising phenomenon that includes small wooden train sets, video tapes, books, clothing, an official Web site and tons of fan sites. But wait, what exactly is a "tank engine" anyway?

How do the engines breathe in diesel submarines? Don't internal combustion engines need a lot of oxygen to run? Where would all of this oxygen come from when the sub is underwater?

Do commercial jets have locks on the doors and ignition keys? If not, what keeps someone from stealing them?

When flushing the toilet in a passenger airplane, I'm amazed by the huge noise it makes -- like a powerful vacuum cleaner. Can you explain what makes this noise?

When I was a kid, my Aunt had constantly flowing water from a natural spring down the hill. She said the water was pumped uphill using a hydraulic ram. This device ran constantly and didn't need any electricity! What is a hydraulic ram and how does i

How are people able to breathe inside a submarine? What do they do to keep the air breathable?

By HowStuffWorks.com Contributors

Steam engines powered all early locomotives, steam boats and factories -- they fueled the Industrial Revolution. Learn how the steam engine produces power!

By Marshall Brain & Yara Simón

Blimps combine the simple buoyancy of a hot air balloon with the technology of an airplane. Learn all about these lighter-than-air vehicles.

By Craig Freudenrich, Ph.D.

Hot air balloons are about as simple as flying can get - no engine, no moving parts really, and very little the pilot can do to control the vehicle. Find out what it's like to fly a hot air balloon!

By Tom Harris

Flying in a glider is about as close as you can get to soaring like a bird. Amazingly, these graceful machines manage their maneuvers without an engine. Learn how gliders fly without power.

By Marshall Brain & Brian Adkins

How do you start a gas turbine engine? What is the mechanism to begin the rotation of the large fan blades?

Since a torpedo cannot have an air-breathing engine like a boat, how is it propelled through the water?

Airline pilots have an amazing job with huge responsibilities. Learn what it's like to be a pilot and what it takes to make it in this highly competitive profession.

By Joel Freeman

Air taxis could make a trip to the beach or a visit with friends and relatives go from taking six hours on the highway to a quick, no-hassles plane ride. Find out how the air-taxi system will operate.

By Carolyn Snare

It's the largest passenger jet ever built -- so huge that airports have to be redesigned to accommodate it. Find out just how big the A380 is and what this type of craft means for the future of air travel.

By Ed Grabianowski

When a military aircraft is in trouble, the pilot may have to eject to save his life. Find out how this crucial escape system separates pilot from plane.

By Kevin Bonsor

Hydraulic cranes perform seemingly impossible tasks, lifting 70-ton objects with absolute ease. See the simple design behind the Herculean results.

By Kevin Bonsor

We see them all the time, but do you ever think about everything these machines do? A fire engine is a combination personnel carrier, tool box and water tanker. Learn all about this amazing 3-in-1 machine.

By Kevin Bonsor

You probably ride escalators all the time, but do you know how they move, and flatten, and keep the handrail in synch with the steps? Find out exactly what is going on inside an escalator.

By Tom Harris

In action movies, elevators regularly plummet to the basement, landing in a spectacular ball of fire. Is this possible? There are some sophisticated engineering techniques at work behind every elevator ride you take.

By Tom Harris

A radial engine has a unique setup that makes it ideal for certain applications. Find out what makes radial engines different, how they operate and where they're used.

By Marshall Brain

Oil tankers carry massive amounts of oil, gasoline and other petroleum products between ports. However, crewmembers must guard against explosions, pirates and more.

By Akweli Parker

Length, height and wingspan are all popular ways to rank an aircraft, but truly giant planes are often judged by their maximum takeoff weight. Which plane outlifts them all?

By Julia Layton

Every one of these classic airplanes was the product of loving care of an intelligent design team doing the best work of their era. Learn how aviation evolved and find links to classic airplane profiles, from the early years through today's jet age.

By the Editors of Publications International, Ltd.