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New Balloons Explore Roof of the Airways
May 1948 Popular Science

June 1941 Popular Science
June 1941 Science Popular Science - RF Cafe[Table of Contents]

Wax nostalgic over early technology. See articles from Popular Science, published 1872 - 2021. All copyrights are hereby acknowledged.

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New Balloons Explore Roof of the Airways

Cover Story

Unmanned research balloon soars upward, dangling its 70-lb. payload of weather instruments on line from open ring at bottom. Here, soon after launching, gas fills only tip of bag. As it rises, gas expands until at 100,000 feet it fills the entire balloon.

Are Secret Balloons the Flying Saucers?

The saucers could be sun reflections on low clouds, or thy could be flattened hailstones, gliding down toward the earth.

Then the saucers could be Army weather radiosonde balloons, fitted with radar reflectors.

• • •

An Australian teacher shoed his students that with prolonged gazing red corpuscles passed in front of the retina of the eye. As a result they "saw" objects in the sky.

One sure-fire flying saucer that fell to the earth in New Mexico turned out to be a weather balloon. Another, near New York, was just a cluster of balloons carrying cosmic ray equipment.

One educational authority suggested that seeing flying saucers was merely a case of the "meteorological jitters."

Another, that they were meteors.

• • •

Still another explanation: speeding airplanes churn up the atmosphere and cause distortion of light rays. The resulting phenomena could be electrical in nature, causing something like smoke rings in the sky.

• • •

A not implausible explanation was based on the high reflective qualities of glass. Why couldn't the saucers be sunlight reflected by plane windows?

At left above is a pretty convincing picture of a flying saucer.

It was created by Popular Science photographers in their own studio. By altering lightning on table-tennis ball at right, above, they simulated natural light on high-altitude balloon for effect at left.

• • •

And that's how your eyes can deceive you. Your guess is as good as the next.

Twenty miles above the earth, the U. S. Navy is hanging its laboratories in space. Balloons that swell to 77 times their starting size provide the floating platforms.

By Devon Francis

Little Falls, Minn. - In the brilliant Minnesota sky floats a pin point of light. To the unpracticed eye, it is only a meaningless white speck against the midday firmament. But to a cluster of men tracking its course by radio direction finder, radar, and theodolite, it represents the culmination of half a century of effort to throw light on some of this planet's darkest mysteries.

Such pin points, think the men who track them, may be the innocent source of the "flying saucer" stories. Actually, the one we are watching is an unmanned balloon, 100,000 feet above the earth. Never before has anything but a rocket gone that high. When the balloon was launched a little more than an hour ago, its helium content made a semi-transparent bubble only 17 feet in diameter. Now, almost 20 miles above us, it has expanded to a great 100-foot-tall envelope measuring 70 feet in diameter.

Expansion did that. At 100,000 feet the air is only 1/100 as dense as it is at sea level. The helium is pushing, seeking release, despite a temperature so low that if a man were exposed to it he would die within a minute. Though the sun is at its zenith, the balloon floats in darkness under a canopy of stars, for the darkness at its altitude is eternal.

Helium is piped through thin, extruded-plastic tube to form 17-foot bubble. Tapelike line stretching toward truck is rest of balloon envelope. Helium-bottle dolly is at rear of truck.

From a harness at its open end dangles a long load line, and to the line are attached a limp parachute and a string of instruments. These instruments are all-important - the balloon is only the vehicle used to deliver them to the altitude that scientists want to explore.

Yet the balloon is the focal point of observation from the ground. That is because the answers to the questions asked by chemists, physicists, and others depend on its behavior. Presently an electric charge timed by a tiny motor will melt a bit of wire, a razor-edged knife will sever the load line above the parachute, and the instruments will start their long journey to the ground.

Flow of helium from steel bottles into manifold, for piping to balloon envelope, is adjusted by technician. At start, only 1.3 percent of the balloon's capacity is filled by the gas.

Plastic balloon skin, forwarded to PS by reporter Francis, is polyethylene. It absorbs few infrared rays, and is unaffected by ultraviolet light, unlike some plastics, or by temperature.

This is Project Skyhook. No explorations initiated in this postwar period are more pregnant with meaning for the future than this one, carried out by General Mills, Inc., of Minneapolis, for the United States Navy.

At launching, helium bubble sails up, picking up load line. Apparatus weighing up to 70 lb. can be attached to it. Dark line seen in the final picture, far right, is the parachute.

"Where our balloons now float," explained Otto C. Winzen, "will be man's highway of tomorrow." He is the young engineer who started the project and brought it to fruition for the Aeronautical Research Laboratories of General Mills.

Those balloons are probing a region that as yet is almost wholly unknown. A few conditions up there have been discovered. It is bitter cold - yet the sun's rays burn with fury far beyond that met anywhere on earth. Gravitational pull is practically unchanged. Winds often exceed 100 m.p.h.

But what about the composition of the air? The effect of cosmic rays on man and atomic structures? The speed of sound? What conditions will pilots encounter if wars are fought at that altitude?

Airplanes can't supply the answers. They can't get much more than half that high. Small rubber sounding balloons reach only the lower levels of the atmosphere. The record for manned balloons is only 72,395 feet. Rockets streaking up and down through this layer of the atmosphere go too fast to take adequate observations.

What is needed is an instrument platform that is relatively stable and motionless in relation to the air - one that will reach and hold a precalculated ceiling of around 20 miles for hours or even days.

Hence, a new kind of balloon. No balloon ever made before is like those of the Aeronautical Research Laboratories. Their skin is tissue-thin. Yet these balloons carry a "payload" of 7/10 of their empty weight.

Science's secret weapon in this assault on the unknown is a plastic, polyethylene resin. Made by the Visking Corp., of Terre Haute, Ind., it weighs so little that one strong man can lift a whole deflated balloon.

Radiosondes, parachutes, tiny radio transmitting stations, radar reflectors, cosmic ray counters, special telemetering equipment, and other devices, about which the government maintains secrecy, have been sent aloft under a single plastic bubble.

Full 206,000-cubic-foot capacity of bag, when it has swollen to the size of several houses, is reached at 100,000 feet or so. If winds are high, bag may be blown out of sight in an hour.

Sandbag at anchor conceals secret device for cutting anchor line electrically at launching. Knife is used in emergency. Balloon will rise above normal airplane traffic in 12 minutes.

Aneroid cell - reliable only up to about 60,000 feet - uses air pressure to run this instrument that records altitude. During climb, stylus etches line on glass coated with lamp black.

For excitement, the launching of a plastic balloon is the next thing to putting your last two dollars on a long shot at Hialeah. The weather must be good for observation. The wind cannot be too high: the plastic is fragile and subject to tearing.

First of all come safety precautions for other aircraft. The chances of collision are remote, but the Civil Aeronautics Administration and the Weather Bureau are advised of each Right in advance.

A ten-wheeled truck snakes a train of anchor boxes, special launching equipment, a helium-bottle dolly, wiring for the electrical cutting of cords holding the load line, and other paraphernalia onto the field, about a hundred miles from Minneapolis. This permanent site was chosen because it is remote, free from intrusion, and off the scheduled airways.

Either alarm clock, far left, or miniature, battery-fed motor with reduction gear, far right, is used to time release of parachute. Shown between them is load-line cutter. Upper-air research was started under auspices of Special Devices Center, Office of Naval Research, Port Washington, N. Y.; is directed by T. R. James, head of company's Aeronautical Research Lab.

The top of the balloon, where the helium bubble will develop, is laid out in the lee of an unused airplane hangar to protect it from the wind. The rest of the envelope is strung downwind with all the gentleness of a mother's caress. As an extension of the downwind line, the load line, complete with its parachute and instruments, is hung on forked standards and anchored by boxes of sand. The load line must be put under exactly the right amount of tension. A slack line might cause an instrument to snap off when the helium bubble is released. That has happened.

The input of gas is measured volumetrically. Wind velocity and direction are checked minute by minute. If the wind shifts, the direction of takeoff must be aligned with it.

Now is the time. A tube, also of plastic, which has been feeding helium to the balloon is withdrawn. Wrenches close the gas bottles. The truck hauls away the dolly. One man prepares to release the bubble. Two others stand within sprinting distance of the anchor points - there may be an emergency. A hundred feet to the side a fourth man will close successive circuits to chop the anchor cords.

The man in charge picks up a megaphone. "Set?" The men downwind respond individually ... "All set."

The bubble soars. As it picks up the folds, the balloon becomes a cobra. For a second or two it writhes. It weaves. Now it has seized the load line. Up goes the parachute. As fast as the tongue can name them off, instruments, radar screens, radiosonde, and finally a bag of sand for ballast are airborne. The sand bag goes along only if there is a shortage of instruments, sent in for the flights by colleges and other institutions collaborating on fundamental upper-air research.

Tracking a Soaring Laboratory

The work has only begun. Now the balloon must be tracked. Its trajectory supplies valuable meteorological data. One man goes to the theodolite. The rest of the crew clumps upstairs to the field control tower above the hangar.

Tracking is going on in other places, too. Within a diamond-shaped" pattern 100 miles long and 60 wide, observers aground are sending in azimuth and elevation reports as frequently as once a minute. Radio direction finders and radar equipment are trained on the balloon. Four shortwave radio communication stations correlate all this information, and it is entered on charts for future study.

Radiosonde contains, from top, tiny radio sender, battery, and baro-switch unit. Switch, run by aneroid cell, selects circuits for sending back temperature, humidity, and air pressure.

Aneroid-tripped electric light is hitched to parachute to warn aircraft when descent is made after dark. Cell cocks on way up, switches all flashing light at 20,000-foot level on way down.

Not much more than an hour has passed; the balloon has leveled off at about 100,000 feet, its ceiling. Through the theodolite telescope it looks like a transluscent pear, less than half the size of a pea. Its load is not visible. Even if the parachute were large enough to be seen, its red color would reflect no light to the eye.

Hours of methodical receipt and entry of reports on the balloon's course go by. Suddenly the man on the theodolite reports: "Parachute's cut loose! Balloon's in four pieces!"

A telephone rings. "Right," says the man on duty, answering, "four pieces at 4:27. We caught it." That was an observer calling in. A voice pages the tower on the short wave: "Broke into four pieces at 4:27."

Shock from inertia forces alone, induced by the balloon losing its load, destroys the delicate envelope to keep it from wandering around aimlessly in the sky.

The day's chores are done now. In anywhere from a half hour to an hour the parachute will touch the ground and collapse. Attached to the radiosonde are directions for the finder: Please ship the parachute and instruments back. That system is unavoidable. Only now and then can the parachute be tracked by radar.

Few parachutes and instruments have been lost, out of scores of flights. Some remitters don't use their heads, of course. One cut a couple of precious shroud lines off the parachute to wrap his package for the post office. Another man, a trapper who stumbled on the gimmicks in the wilds of the north country, pulled his gun and shot up a couple of instruments.

The project is still experimental in that research never ends. For example, around 70,000 feet the radio transmitters may begin arcing between terminals because the air becomes too thin to act as a non-conductor. Something must be done about that.

Temperature-measuring equipment is also inadequate. It gives, not the temperature of the free air, but that of the air plus solar radiation effect. No instruments have yet been developed, to measure pressure and dew-point accurately between 80,000 and 100,000 feet and telemeter the data back.

These are details. The end product of upper air exploration is a better understanding of our planet. Cosmic radiation and meteorological research alone will yield results that will benefit all mankind.

That realization helps the men get their feet on the floor when the alarm goes off at 3 a.m., signaling another day to fly a balloon.

 

 

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