Category STORY

Aircraft needs to pick up immense speed, on the ground, before it can get airborne. The speed at which air runs over and under the wings (Bernoulli’s principle), provides the upward thrust. Higher speeds generate more powerful thrusts and thence more lift.

Aircraft have giant wheels. The runways at modern airports are very long. The pilot starts the engine, revs it up and waits for the engine to gain enough power and thrust before he pulls the lever. The aircraft gains speed. More speed and still more speed! Then, suddenly, the nose of the aircraft tilts up. It cuts its way through space. The nose moves further up. The aircraft gets bodily lifted. The steep climb ends, once the aircraft gains the height it needs to cruise. The pilot presses a control button. The wheels retract and slip snugly into the body of the aircraft.

Runways are essential to put an aircraft in flight and permit it to land back. The aircraft is of no use where this facility does not exist. At such places, the helicopter comes into play (Fig. 12.1). The helicopter has a main rotor and a tail rotor. They are mounted on top of the frame. The main rotor provides the lift. The tail rotor checks the tendency of the helicopter to pull in a direction opposite to that set by the main rotor. The rotors rotate at very high speed, force the air to part and provide the necessary lift.

The helicopter can move in any direction or simply hover over one place by suitable adjustment of the angles

of the blades of the main rotor and the tail rotor. The adjust­ments are made with the help of pedals and levers.

The basic idea for the helicopter goes back to 12th cen­tury China. A toy-maker shaped a slim elegant shaft with holes from wood. Into the holes, he inserted and fixed small arms, shaped with care. The toy looked like a huge screw. The man added three propeller-like wings attached to one end. A firm tug at the free end of a string that wound round the central rod sent the toy into a spin. This spin produced the lift and made the toy fly.

Leonardo da Vinci, one of the greatest artists of all times, was a genius (Fig. 12.2). His interests were varied. He loved to paint. Da Vinci spent hours, observing birds in flight. He drew pictures of birds in flight, studied the anatomy of birds to find out the secret of flight. This quest led him to the details about the old Chinese toy.

He worked on the design and
drew the blueprint for a machine that resembled a giant screw. He called it, ‘Helipteron’, by combining two Greek words, Heli (means spiral) and Pteron (wings). Da Vinci be­lieved that it could fly. But how could it draw power to stay airborne? He thought four men could work the bars, at­tached to the airscrew. He left it at that.

Centuries later, Lomonosov, a Russian scientist, put a crude form of the helipteron in flight in 1754. In 1843, Sir George Cayley spent time to fabricate a flying machine that would take off vertically.

Louis and Jaques Breguet were siblings. They flew kites, spun out boomerangs that returned to them after short flights. Then they read about the helipteron. They assem­bled crude replicas with whatever they could lay their hands on. This childhood interest led them into the field of flight, once they were on their own. Charles Richet, another young man, joined them. The three spent all their spare time on the design of the helicopter. They called it the Gyroplane. The rotors whirled very fast. In 1907, the machine rose by 0.6 m on the first attempt. On the second try, it lifted itself bodily to a height of 1.6 m.

In the same year, Paul Cornu came up with a more effective design. It had twin rotor blades, powered by a gaso­line engine. The helicopter lifted itself and Paul up in space. It rose to a height of 0.6 m and stayed aloft for about 20 seconds. In the next trial, the helicopter rose up, taking Paul and his brother too aloft.

These were small beginnings, faltering steps taken by the pioneers. It took three more decades before the helicop­ter truly entered the field of aviation. Heinrich Focke, a Ger­man technologist, studied the work done by the pioneers. He improved on the designs. He carried out tests with his machines. Finally he felt confident that he had a design of a helicopter that would fly as freely as an aircraft.

In 1938, Heinrich announced that he would hold a public demonstration in Berlin. Huge crowds gathered to watch the air show. The helicopter stood at the centre of a wide open ground. Hanna Reitsch, a daring young dame, was at the controls. Heinrich went round, making last minute checks. Finally, sure that everything was in perfect working order, he signalled to Hanna. She started the en­gine. The deafening sound of the rotors, whirling madly, resounded in the air. People craned their necks to get a bet­ter glimpse of the grand show. The helicopter rose in space. It was incredible. The machine kept gaining height. On and on to record a height of 2,400 m! It flew forward at 120 kmph; and backward at the speed of 32 kmph. It covered a dis­tance of about 225 km. The helicopter came of age, on that historic day.

From then on, its growth was phenomenal. It devel­oped more range and speed, and found its place in civil and military operations.

Helicopters airlift wounded soldiers from forward lines to base hospitals; fly in to drop men and material in diffi­cult terrain, that are not accessible by road; maintain the supply line to forward posts. Helicopters are found active in war zones and disaster stricken areas. They carry out survey operations and weather studies. On ceremonial occasions, like the Republic Day, they fly low along or around the venue, drop flowers that make the scene truly colourful.

Helicopters were held in readiness, on 24 July 1969, to pick up the astronauts when Apollo 11 Command Module touched down on the high seas. The helicopter hovered above the space capsule. It dropped a flotation ring to the capsule and pulled up the’ astronauts.

In India, helicopters fly supply missions to several for­ward posts in the Himalayas. These missions are danger­ous. Pilots steer the helicopters between mountain ranges. Often wild winds rock the helicopters. It demands immense courage to carry out such missions, especially when the posts lie close to the enemy lines and danger of sniper fire always exists.

Naval helicopters undertake several specialised tasks. They carry out reconnaissance flights. Anti-submarine heli­copters use sonar devices. They spot enemy submarine and drop depth charges to explode near the submarine. If the hit connects, the submarine’s hull gets cracked or it is forced to surface. These sonar devices send out wave pulses into the waters and wait for the reflected echoes. They show up as a blip on a TV screen. Experts study the image and de­cide if it is a whale or a submarine. This decides the course of action to be taken. Naval helicopters rescue fishermen who drift at sea during cyclones.

Daring are those who man the helicopters. One instance comes to mind.

It was 13 October 1992. Tourists were in high spirits when they boarded the cable car to take them to the Timber Trail resort on the hilltop, close to the Shimla-Kalka high­way. The cable car slid across, providing a grand view of the gorge, about 2,500 m below. One moment the car was gliding, smoothly. Next moment, two of the wires of the cable car snapped. The car tilted, dangerously. Those in the car clutched the bars or held on to each other, while the car swung like a leaf in a storm. Fear gripped them. Would the remaining six wires hold on? Or would they snap and dump the car, with the tourists, into the gorge?

The local police immediately sought help from the IAF and the Army. The IAF station at Sarsawa received the call about two hours after sunset. It was too late to launch res­cue operation. The trapped tourists spent the night, on board the dangerously hanging car, hoping against hope that they would survive the ordeal.

Next morning, Air Force helicopters flew in. They stud­ied the terrain and the strategy for the rescue. Several attempts were made to land a commando on the cable car, break into the car and winch the trapped people. But strong winds aborted every attempt. Should they wait till next morning?

"No", said Major Ivan Casto, one of the commandos chosen to land on the car and to carry out the rescue.

"Have you any idea of the risk? The winch comes in the way", one of the team members pointed out the danger. (The winch is a roller that has steel cable wound round. Very much like the spool with the string whose free end is tied. The turn of the spool decides how much string the kite gets.)

"I know", said Major Ivan Casto.

"We will be forced to cut the winch if you or the cable that takes you down to the car touches a cable of the car. That will send you hurtling in space, crash in the valley. What hopes have you of survival if that happens?" said the pilots who would stay on the helicopter and try to keep it stable and steady.

Casto pursed his lips and said firmly, "Let us get going".

It was around 5 p. m. The helicopter took off, hovered directly over the cable car. The winch lowered Casto to the top of the cable car. He broke the glass panes of the cable car. The tourists beamed a welcome smile. His presence worked wonders. He got down to work immediately. A fa­ther and his four-year-old son, strapped on to his back, were hauled up first. Four more persons were winched to the helicopter before darkness fell.

The operation was suspended for the day. Casto spent the night in the cable car. His presence worked wonders. Those who remained in the cable car now looked relaxed. Rescue operation was resumed next morning and completed by 10.30 a. m. It marked one of the finest hours for the army commandos and the helicopter pilots.

One could recollect hundreds of such daring feats in which gallant men on board helicopters performed death – defying acts. Each of them confirms the power of courage. Truly has it been said, "Courage conquers".

Courage conquers, we said. Every pioneer displays cour­age of a high order. Each one is a dare devil. Each feat is unique. A quick survey of the history of aviation leads us to more names and events. Let us take note of some of the men and events that made aviation history.

The first name that comes to mind is of Sir George Cayley. He tracked down the forces that needed to be con­trolled before one could fly. These were Tift, drag, thrust and gravity’. He developed the controlling mechanisms to counter-balance these forces and thus provide balance to the flying object. He shaped the horizontal rudder (or el­evator), experimented with multiple-wing designs, thought of the propeller. For over forty years, he worked. Finally, in 1849, he decided to test fly his tri-plane glider. He strapped a 10- year-old boy on to the glider and tested it at the open grounds close to his home Brompton Hall. The glider soared in space.

Lindbergh flew across the Atlan­tic solo and created an endurance record. The round the world trip in The Voyager by Dick and Jeana set an­other endurance record. Charles Kingsford Smith tried a different type pig 13 1; Charles of endurance (Fig. 13.1). He became Kingsford Smith

the first man to fly across the Pacific. He set out, with three others, in May 1928, from Oakland Airfield, US, and landed at Brisbane in June (Fig. 13.2). For him it was a dream come true.

Amelia Earhart was not the first woman aeronaut. That glory belongs to Jeanne-Genevieve Garnerin who soared in space in a balloon. She also was the first parachutist. Mrs. Cromwell Dixon was amused when her 13-year-old son in­vited her to fly an ‘air bicycle’. He told her that she had only to pedal with all the power at her command and she would be taken into flight. She tried that in 1909. She ped­alled hard and the machine took to flight, carrying her along. Therese Peltier, a French sculptor, was the first woman to fly an aircraft solo. Raymonde de Laroach was the first li­censed pilot. She received the licence in 1910. Eighteen years later, Lady Mary Heath flew an aircraft from Cape Town to London. In 1932, Maruyse Bastie of France flew alone, re­mained airborne for 38 hours and created a record.

Flight opened up immense opportunities for the ad­venture seekers.

In 1911, the first major long-distance air race was or­ganised. The route was Paris-Belgium-Holland-England (over the Channel) and back to Paris. There were 43 entries; and 12 different types of aircraft. Nineteen participants com­pleted the first lap. Nine crossed the finish line. Three lost their lives and six were seriously injured. The races, held annually, drew a lot of enthusiastic participants.

In 1913, the Michelin Cup Race set down a challenge for pilots. They were required to cover specific distance and maintain an average speed of 50 kmph. At the Gordon Bennett Trophy, held in the same year, Jules Vedrines’ air­craft recorded a speed of over 160 kmph. It took another seven years to double this speed record. Flying a 300 hp engine, Sach Lecointe registered, at Etampes, speed of over 320 kmph. In 1922, Billy Mitchell broke this record and won the Pulitzer race with a speed of 350 kmph. The quest for speed finally led man to the Concorde (Fig. 13.3). In 1995, the Concorde flew round the globe, taking short halts at Touclouse in Southern France, Dubai, Bangkok, Guam, Honolulu and Acapulco in Mexico before returning to New York, in less than 33 hours.

The quest for more speed demanded improved designs. Often the newly designed aircraft crashed. Accidents took a heavy toll of men and material. But mishaps did not deter the daring. Many young men explored the limits to which the aircraft would go along with them. They performed loops and turns, dipped and rose. Large crowds gathered to watch stunt shows.

Charles Willard, a Harvard graduate, trained under the ace flier and aircraft designer, Curtiss, before he turned to stunt shows. He came to be known as the Wizard. In 1910, he commanded $1,000 per flight. Many others took to stunt shows. But most of them died in accidents. A common say-

ing, in those days, read: "There are plenty of bold flyers; and plenty of old flyers, but hardly any bold old flyers".

In 1913, at a public show, Edouard Pegoud performed death-defying loops in space. The aircraft gracefully arched and turned around, yielding to the command of the pilot. The Press reported the show.

Lincoln Beachey, who revelled in performing spirals and dives with planes, read the news. He decided to try the stunts. He set before Curtiss his plan. He wanted a specially reinforced bi-plane that could stand the strain of sharp loops. The first model crashed. The second one stood the trials. It had a top speed of over 165 kmph. Lincoln Beachey scheduled his show for 14 March 1915. He took off from San Francisco, climbed over the bay toward Alcatraz, reversed course and performed a series of loops, losing height with each one. Back he climbed to 1100 m and dived straight down.

He dropped so low that people could spot his head above the wings. It looked as if he was crashing. But, at the very last moment, he pulled sharply on the stick to regain level flight. That was too much for the aircraft. The wings broke away. The aircraft crashed in the bay. The stuntman was alive, but was trapped in the wreckage. He drowned before he could be pulled out.

After the end of the Second World War, many young fighter pilots were jobless. The more daring among them found work as stunt pilots. They showed their skill at carni­vals. They walked on the wings, while the plane was in flight, or jumped from plane to plane while in flight or got on to aircraft from running cars, ambling up rope ladders suspended from jennies.

In September 1999, Jurgis Kairys, a Lithuanian pilot, displayed a rare stunt. He flew an SU-26 plane at a speed of about 300 kmph under 10 bridges spanning the Neris River at Vilnius, the capital of the Baltic State. It was a risky show. The bridges are just 6 m above the waters. That did not de­ter Jurgis. It took him just under 20 minutes to complete the show. Asked what more he had in mind, Jurgis joked, "The only thing that remains to be done is to fly under all the bridges upside down". Speaking about this show, Jean Louis Monnet, Chief Executive of the International Air Sport Fed­eration, said: "As far as I know, this was the first stunt like this in the world".

In India, the Air Force often organises special air shows. On Republic Day, the aircraft perform stunts over Raj Path. They loop around, fall freely through space, swiftly turn, regain height and vanish into the sky. The aircraft fly in formation, yet not once do they get into the flight path of each other (Fig. 13.4).

A different form of challenge came in with the arrival of ultralight crafts. In 1960, Francis Rogalli developed a light­weight plastic arrowhead shaped flexible wing. He called it

para-sail. It was meant to be a gliding type of parachute for lowering pieces of cargo from high-flying aircraft. It did not find favour with the defence agencies. Acceptance came from an unexpected quarter. Gliding experts picked it up. They rigged a sort of trapeze, spread fabric to form the wing and added a few wires to control flight by shifting weight on trapeze. Thus began the sport of hang gliding. In the mid 1970s, they added small engine and propeller to the craft.

The glider has no wheels, no landing gear. The man riding the glider runs into the wind and takes off. Often the lover of gliding takes the glider to the top of a slope and runs down picking up speed till the glider gets airborne.

Himachal Pradesh holds annual hang gliding competitions before winter really sets in. Hang gliding has become very popular world over.

Is there any room for heady excitement, while we stay on the ground? Radio controlled sailplanes provide this fa­cility. These parasails are very light. Hardly 2 kg, including the radio, placed in a little black box in the nose of the plane! The person on the ground operates the control and defines the flight path.

People who fly the machines, be it an aircraft or heli­copter or glider or parasail, constantly improve designs to break established speed or endurance records. They believe that when it comes to development, even the sky doesn’t set limits.

Innovators know that the future is not theirs to see. The future needs expansion of the vistas of knowledge. That is what they do, continuously. They explore virgin territory that lies currently outside the bounds of knowledge. They dare the untried. Thus they become pioneers.

What further developments await aviation?

Aircraft will become sleeker and lighter thanks to spe­cial adhesives. They make it possible to bond material— aluminium, plastic foam, carved and evened out and cov­ered with fibre glass—better. These materials make the air­craft stronger and lighter. Moreover, they give scope for new shapes to aircraft, shapes that reduce resistance of air by directing the airflow round the plane and not into it. That leads to better speed, lesser fuel consumption. Work is on to harness new material to make the engine lighter and more fuel-efficient. New energy sources—liquid hydrogen, elec­tric power, solar energy and even atomic power—are being tried out.

How will these changes benefit us?

Does it not cheer us to note that some day, in the future, we may be flying our own aircraft! That is no tall story. Look at cars on Indian roads? Did anybody imagine, twenty years back, that the common Indian could own a car? Yet, now, the car is within the reach of the middle class. In the devel­oped nations, smaller planes are owned and used extensively, by citizens. Today is their day. Tomorrow will be ours.

All those who drive through the congested roads of major cities share one dream. If only cars could take to flight, whenever there is a terrific traffic jam! Boeing is working on just this dream vehicle called the electric flivver. It is an airplane-cum-car that takes off easily when it finds itself stuck in’the traffic. Once it gets beyond the stretch of the road that is jammed, it returns to the roads and runs like any normal car. Its gets lift with the help of rotors, fixed on top (very much like the helicopter).

This idea is being extended to develop aircraft that can fly faster than sound and can take off from anywhere. Named, The Transonic Business Jet, this plane will have vari­able sweep wings. These wings, as their name indicates, will sweep forward and backward. They will adjust to the cen­tre of the lift of the aircraft when it flies faster than the speed of sound. While cruising, the wings will be reset at right angles to the fuselage. The plane will be fuelled by liquid hydrogen. Its maximum speed will be about 2,600 kmph.

Ever seen a flying saucer? We are not talking of the saucer that flies in space after we aim it at someone who annoys us. Flying saucers are what aliens, out there in space, use to visit our earth. Or so say those who believe there are intelli­gent life forms out there, in distant galaxies. It is this shape that Boeing finds ideal to serve city commuters. Powered by heavy flywheels that spin in opposite direction, it can take off and land vertically, operate from parking lots in major cities.

Boeing is also working on an amphibious plane. One that can operate from land and water!

These reports cheer us. Then comes another question. Will air travel become faster? Faster than the Concorde that covers the London-New York route in about three hours? The answer is YES! Research is on to fly aircraft at speeds ranging from 4,800 to 12,800 kmph. These aircraft shall fly at altitudes 30,000 m to 39,000 m, where the earth’s gravity is only five-sixth of that on the ground. The aircraft will use jet fuel at speeds up to 5,760 kmph. Then, the turbo engines will shut down, and jet engines, using liquid petroleum, will take over.

In July 2002, Boeing designed a super-efficient aircraft that looks like a giant bat. It has no fuselage or tail, just a huge wing, with a belly that has space to accommodate 480 passengers. The aircraft is so designed that its structure pro­vides the lift. So it will take 32% less fuel and bring the cost of air transport down.

Lockheed has plans to produce a cargo aircraft. It will carry 1,80,000 kg of cargo non-stop to any place on the earth, flying at a speed of 800 kmph. It can fly for weeks, as it will be powered by nuclear energy.

For transport of cargo, another unusual idea is being explored. It is an aircraft with thick wings that shall hold the cargo. The flat bottom of the wing will stay a few feet above water. The craft will fly low, carrying 1,98,000 kg of freight, at a speed of about 480 kmph.

On 30 July 2002, Australian scientists launched a hy­personic ‘scramjet’. It has a revolutionary new engine. The oxygen in the air enters the engine and ignites hydrogen fuel. The aircraft, it is claimed, can fly at speeds of over Mach 8.

These changes will certainly improve civilian transport. They will be suitably adjusted to serve military purposes too.

At the same time, aircraft specially designed for de­fence purposes are in the pipeline. Fighters will carry pow­erful bombs and guided missiles more easily. Rockwell In­ternational launched a bomber, controlled by the pilot on the ground. The idea is catching on. An army general noted, "In the 21st century, we will definitely rely more on pilotless

aircraft to place people out of harm’s way".

Can laser beams propel an aircraft? Scientists at the Tokyo Institute of Technology experimented with laser-pow­ered paper airplane. They are now getting ready to fly tiny pilotless planes. Ultimately they plan to propel planes at several times the speed of sound at high altitudes, where the air is too thin for jet engines to operate. Laser beams from satellites or high-altitude balloons will propel the air­craft.

Laser produces high intensity coherent light waves. Waves remind us of radars that detect aircraft in flight. Can an aircraft evade detection by radar? It can, once we know how the radar works. Radar sends out radio pulses into the flying object. The waves are reflected back to the radar sta­tion. The blip on the screen helps identify the aircraft.

Scientists took note of this fact. Could they distort the reflected radio pulses and thus make it hard for radars to detect the flying object? Then came an idea. An object that has only curves, no flat surface, scatters the waves and dis­perses them in all directions. The scientists exploited this scientific principle. However, this idea gave very limited success. Then came the idea to make all the surfaces of an aircraft as plane as possible, with no surface at an angle that would reflect the waves back to radar. They also developed special paints for the aircraft. These paints absorb some of the radar waves. The end product is the Stealth aircraft.

High altitude surveillance is vital for national defence and for earth study. Lockheeds plans a High Altitude Pow­ered Platform. It will carry cameras and instruments to watch troop movements or identify military installations or esti­mate crop growth or warn about locusts or shifting weather patterns. It will be powered by solar energy.

In July 2001, Helios, a solar powered plane that shall fly for months on end, maintaining a height of 30,000 m, was tested at Hawai (Fig. 14.1). "It is powered by its
shadow", John Hicks, the programme’s manager, joked. Made of carbon fibre, it weighs about 800 kg. It undertakes unmanned flights. It is controlled from the ground. It flies at a very high altitude, far above the clouds. So all day long, it gets sunlight that powers its flight.

Remember Burt Rutan who designed the Voyager? In December 1986, Dick Rutan and Jeana Yeagar flew the air­craft, round the globe, non-stop and created history. Now (in January 2005), Steve Fossett—the first person to circum­navigate the globe solo in a balloon—is all set to perform a similar feat. He will be flying the aircraft GlobeFlyer—solo— designed by Burt. The flight is expected to be completed in 70 hours.

These are developments that we know of. But quietly, silently, secretly (driven by commercial or defence interest), many more advanced designs are taking shape.

What does aviation hold for man, in the days to come? The future is not ours to see. But we have a hunch. One based on reason and logic. Aircraft manufacturers are tak­ing advantage of latest technologies. This is a continuous process. So we can confidently predict the future, say that the aircraft of tomorrow will be faster, more comfortable and sleeker than the ones around now.

On that hopeful note, we end the Great Aviation Story.

In 1783, men first soared into space, riding a hot-air bal­loon. It was the result of pioneering work by Joseph Montgolfier and his brother Etienne, of Annonay, France. They realized that a balloon, filled with hot air, gained the required upward thrust for flight because hot air is lighter than the air around us.

Could an object, heavier than air, defy gravity and fly? That question remained unanswered, for over 120 years. This was a time well spent. During these years, many people in Europe and the United States experimented with kites and gliders. These experiments proved that objects heavier than air could fly. But nobody knew how to engineer a flying machine that would remain airborne.

Many people tried and failed. Failures, it is said, are stepping stones to success. Each failure brought out a few more insights into what more had to be done to make the dream come true.

Finally, two young men, Wilbur Wright and his brother Orville Wright, found the answer. They became the first men to fly a machine that was heavier than air. The machine was crude, unsophisticated, yet it flew.

That event marked the beginning of the great aviation story. Daring men and women explored the frontiers of the aircraft’s range and speed by designing shapes and engines based on latest technological advances. The explorers have not reached the end of the road, either. They are still hot on

the chase of ways and means to take the aircraft to new records in speed, safety, style and elegance.

Aircraft, however, have one limitation. They can’t take off or land almost anywhere. They need long stretches of runways. The search for an alternate machine that would take off and land vertically led to the invention of the heli­copter.

Innovators are working on furthering the style, design and performance of the aircraft. They predict still more spec­tacular developments in aviation, in the years to come. Some say that sky is the limit. Others assert that even the sky can’t set the limit to the future of aviation.

This book is history, with a difference. This is history, where facts have been touched up with the liberty of a crea­tive writer. This presents the great story of aviation.

R. K. MURTHI