Showing posts with label Technology. Show all posts
Showing posts with label Technology. Show all posts

The Attempts to Break a 50-Year-Old Free- Fall Record Continue

As Joe Kittinger found out in 1960, it’s hard to jump from a height of 102,800 feet—let alone in an open gondola, in minus 100 F temperatures, wearing 160 pounds of equipment—and survive. As Michel Fournier reaffirmed this weekend on an airfield in Saskatchewan, it’s even more difficult to break that 50-year-old record for the highest free fall. 
The French parachutist attempted, for the fourth time, to rise to a height of 130,000 feet in a pressurized capsule dangling beneath a high-altitude air balloon, then step out of it and hurtle toward Earth at supersonic speed, breaking the sound barrier. One of the previous attempts, which began in 2002, left Fournier remaining on the tarmac due to bad weather; another resulted in a torn parachute and a mechanism that fired prematurely, separating the capsule from the balloon just as it took off. This year he returned to North Battleford with a brand new balloon and launch team—American pilots who told me they used vacation days to “come up here and get this guy to where he wants to go.” 

The surface winds at 2:30 am on Sunday, when the team began setting up for the attempt, were around 6 knots—right at the edge of the window of safety for launch. The headlights of a forklift pierced the blackness as it lumbered from a small metal hanger on one end of the airfield to another, ferrying a large plywood box with the balloon packed neatly inside. In the distance, Fournier’s silver capsule, shaped like a bullet, sat illuminated in a cone of light. At 4 am, the sky lightened to a deep purple, then a smoky blue, and by 4:18 the Canadian flag whipping over the main terminal had slowed to a lazy wave, and then finally hung limp from its pole. 

The plan, the team’s meteorologist had told me earlier that morning, was to be off the ground right at dawn, the quietest hour. The weather, he said, was the one problem they couldn’t Fed Ex or solder their way out of; if it wasn’t safe they’d have to put the brakes on the attempt, and the weather forecast deteriorated steadily throughout the week. At 5 am, the small crowd of local observers, peering through binoculars along a chain link fence at the airfield’s perimeter, could see the polyethylene balloon stretched out for 400 feet along the runway. Fournier, in a bright yellow space suit, sat prebreathing pure oxygen in the open door of the capsule. 

 

Winds were still calm at 7 am, two hours after the balloon team had planned to launch, when fire trucks arrived to observe the balloon being loaded with helium. The transparent fabric, shimmering in the morning sun, began to float up off the runway. Then, the low hum of the helium truck stopped. Fournier’s press agent answered her ringing cellphone and took a few steps, repeating a plaintive “oh, shit.” Fournier’s reserve parachute had popped open in the capsule during a pressurization test. The attempt had to be terminated for the day. 

But, stratospheric balloons are made of a sheer, low-density plastic. They’re for one-time use. Once inflation has begun, it’s difficult to stop. The team carefully spooled the balloon back in, but the top 30 or so feet suffered stretch marks. By the time they returned to their base, a tiny motor lodge in North Battleford, the pilots were not only frustrated but concerned about the balloon’s integrity. Because a problem with the fittings of Fournier’s spacesuit had caused the two-hour delay, they had also lost confidence in the rest of the effort. They took a vote. 

This morning, the team (with the exception of the manufacturer) is flying back home. It was a narrow flight window, and a difficult mission. Everything had to go exactly right. The weather, the team’s meteorologist said, had been beautiful—a perfect day for a flight. They feel sympathetic for Fournier. He’s 66 years old, and a charming man; this may very well have been his last chance to make the history books. But they’re pilots, and they make decisions based on the available facts. They followed procedure. The record stands. 

The Ultrahot Torch That Slices Through Steel

The Metal Vapor Torch might be the next best thing to a lightsaber: a belt tool that can generate a blade of flame that slices through a half-inch steel bar in less than a second. 

Energetic Materials & Products, Inc. of Round Rock, Texas designed the MVT as a tactical breaching tool for police and others who need to cut through bolts, chains, and padlocks quickly. By using reactive material technology with solid fuel and an oxidizer, the MVT is cheaper, lighter, and more compact than a traditional oxy–acetylene torch. 

At the heart of the MVT is a reaction between copper oxide and precisely graded particles of magnesium and aluminum; consistent particle size is crucial to ensure that the torch burns at the desired temperature. The result is a jet of flame with a temperature over 2700 C (nearly 5000 F) and a speed of over 2000 meters (more than a mile) per second. A rectangular carbon fiber nozzle shapes the jet into a flat blade for cutting. The jet has higher energy density than a gas flame; the cutting action is produced by a combination of heat and abrasion by particles of metal oxide. 
DOWNLOAD LINKS
The MVT is the size of a tactical flashlight and is quiet in operation. The fuel comes in small cartridges which burn for a couple of seconds; a fresh cartridge can be loaded rapidly so the operator can cut through several obstacles in quick succession, and the torch handle can be reloaded and used as many times as needed. The solid fuel is highly resistant to shock and is safe at temperatures up to 550 C (1022 F). 

Dennis Wilson, the CEO of EMPI, says that the torch will be priced at around $135, with the intent that it be affordable enough to be supplied to every member of a police team. Cartridges will be about $35 each. The first preproduction version of the MVT will ship later this year, and feedback from users will help shape the final production model, Wilson says. 

EMPI has also developed other versions of the MVT. For instance, the design can be scaled up, and Wilson has tested larger versions capable of cutting through inch-thick steel. The MVT could be equipped with fuel cartridges that incorporate abrasive additives for cutting through fiberglass. An alternative round nozzle could punch holes rather than cutting straight lines. 

The MVT—which is a spinoff from work done by the U.S. Air Force—would be useful for first responders who need to cut through rebar to rescue accident victims. It works as well underwater as it does in air, making it suitable for divers, and it can be triggered remotely, or used by a robot, to swiftly disarm IEDs without setting them off. 

How to Fly a Zeppelin Airship

Floating through the air 200 feet above the ground, I glide past a cluster of buildings, a stand of trees, the shoreline of a shimmering bay. A golf driving range drifts into view. Four men stop swinging their clubs and stare up, open-mouthed. In an age that's jaded by wall-to-wall entertainment, they're experiencing an all-too-rare sensation: pure awe. A giant oval shadow moves over them, and I'm gone. 
If the guys at the golf club think a low pass by a 246-foot airship is impressive, they should check out the view from the pilot's seat. That's where I am, getting flight training in a zeppelin. It's an incredibly rare privilege. There are fewer licensed zeppelin pilots in the United States than there are Supreme Court justices. And there is only one zeppelin airship in the country. 

For most people, the word zeppelin evokes one indelible image: the Hindenburg's flaming crash in 1937. That catastrophe struck the death knell for commercial airship travel, but the Luftschiffbau Zeppelin company, which owned the doomed airship, hung in there. Out of the wreckage of postwar Germany, it prospered in a variety of ventures, among them selling and servicing Caterpillar construction equipment. Then it got back in the airship business, launching a helium-filled model called the Zeppelin NT (for "new technology") in 1997. Since then, the company has built three more airships, now flying in Japan and Europe. 

To see the American zeppelin up close, I travel to San Francisco, where a company called Airship Ventures operates the Zeppelin NT Eureka. Mostly, Eureka earns its keep by carrying passengers on short sightseeing jaunts. A year ago, however, the company also began offering zeppelin-piloting classes. Customers who have a private pilot's license can spend two days learning about the zeppelin, including 3 hours riding as a passenger and a half-hour as the pilot. 

At noon on a sunny Monday, I arrive at the front gate of Moffett Field, a former Navy base. I go to a classroom with five other students and chief pilot Fritz Günther, a severe-looking former flight instructor in the East German air force who introduces us to Eureka's basic principles. He explains that a Zeppelin NT is designed to fly a bit heavier than air, which makes it easier to handle on the ground (airships of the Hindenburg era required hundreds of men to hold them down). To get off the ground, the zeppelin is equipped with propellers that can swivel up and down to provide vertical thrust. Then, when the ship is in the air and moving at speed, it shifts into "flight configuration," in which the engines swivel to horizontal. In effect, the highly maneuverable Zeppelin NT is a cross between a dirigible and a tilt-rotor aircraft like the V-22 Osprey. 

The next morning we finally get to climb aboard. Inside, the gondola is spacious, more like the interior of a yacht than an aircraft. It feels like a yacht too—even on the ground, the gondola's slow rolling motion reminds me of an ocean swell. The first student straps into the pilot's seat, with Günther in the co-pilot's chair to his right. The engines increase in pitch. Smoothly, we begin to rise vertically into the air. We start to move forward as well, as though ascending a giant escalator. The expanse of the airfield falls away, and soon we are coasting along at 1000 feet over Silicon Valley. 

Those of us who aren't at the controls roam around the gondola, admiring the view. The windows slope outward, so we can look straight down and watch the scenery scroll beneath our feet. I open a window and stick my head out into the 40-mph slipstream like a dog on a road trip. Mountains lie to the west, the bay to the east, all of it soft and gauzy in the morning's lingering haze. As an Airship Ventures staffer hands out snacks and drinks, I feel like I'm at a party that happens to be dangling a quarter-mile up. 

Eureka returns to the airfield and touches down; now it's my turn. I strap in and put on a headset. Almost immediately I'm struggling to keep up as Günther talks me through the controls. There are so many of them. One lever controls the angle of the two forward propellers; a nearby pair changes their thrust. A joystick on my left-hand side commands the rear propellers to pitch the nose up and down or to yaw side-to-side. On top of that, there are numerous switches and levers and toggles to control the pressure of the helium and the distribution of ballast. Helpfully, Günther tells me what to do; if I'm too slow, he reaches over and moves the control himself. 

Up we go, climbing and gaining forward speed. I focus on the stick as I try to keep the enormous lumbering craft under control. With three engines, four propellers and a bag of helium gas whose buoyancy constantly changes depending on the temperature and pressure, piloting the zeppelin is like flying an airplane and making a scuba dive at the same time. As I try to figure it all out, Eureka bucks and weaves through the California sky like a spastic humpback whale. 

As we reach 25 mph, Günther switches the ship to flight configuration. Now we're using the fins, not the engines, to control the ship's motion. I'm starting to get the hang of it. Part of the trick is to fly the zeppelin like you'd steer a sailboat, anticipating corrections by a few seconds. But I still can't seem to stop the ship from unexpectedly rearing up or shifting to one side. "Remember, it's not just you moving the ship," Günther says. "You've got air currents and lift from thermals." 

I keep trying. Precision flying, this is not. But I've reached my moment of Zen: No matter how badly I fly this thing, it's still going to keep bobbing along. You can't flip a zeppelin upside down; you can't dive-bomb it into the earth. The ship is inherently stable. That's comforting to know. And the golfers below certainly seem more than impressed. 

My time is almost up. I head back toward the airfield and start coaxing Eureka down, angling the thrusters forward and back, toggling the throttle, easing us slowly toward the tarmac and the waiting ground crew. A few yards off the ground, the ship hangs, hesitant, then a nudge of thrust brings the front wheel down. The crew grabs a line hanging from the nose, and we're back on the ground. I unstrap and climb out of the pilot's seat, still feeling lighter than air

Read more: Airship Zeppelin Pilot Training – How to Be an Airship Pilot - Popular Mechanics 
Related Posts Plugin for WordPress, Blogger...