Tag: montgolfier brothers

Calendar: December 14

A Year: Day to Day Men: 14th of December

Crouching in Socks and Sneakers

On the fourteenth of December in 1782, the Montgolfier brothers, Joseph-Michel and Jacques-Étienne, performed the first test-flight of an unmanned hot air balloon in France. 

The Montgolfier brothers were born into a family of paper manufacturers. Joseph-Michel was the twelfth child of Pierre Montgolfier and Anne Duret; Jacques-Étienne was the fifteenth child and was later sent to Paris to train as an architect. After the death of the eldest son who was his father’s business successor, Étienne was recalled from Paris to long the family’s paper manufacturing business. 

Both Joseph-Michel and Étienne were talented innovators and inventors. Joseph-Michel invented the self-acting hydraulic ram in 1796 and Étienne founded the first paper-making vocational school in France. For their business, the brothers together invented a process to manufacture transparent paper vellum, suitable for use in situations where tracing was required. As avid balloonists, they invented the Montgolfière-style hot air balloon, a globe aèrostatique, with which Jacques Étienne made the first piloted ascent by humans in 1783.

Interested in aeronautics, Joseph-Michel had built parachutes as early as 1775. Watching the embers rising from a fire, he wondered is the same force could be used for a military air assault. Joseph-Michel  believed that the smoke was the buoyant force which lifted the embers; from that assumption he preferred to use smoldering fuel for his experiments. He built a test structure of a very thin wood box with a light-weight taffeta cloth lid. After lighting crumbled paper in the box, the structure lifted off the stand and touched the ceiling. 

After recruiting Étienne through an urgent message, the brothers built a similar structure but three times the size with a volume twenty-seven times greater. On December 14th of 1782, they ignited the wood and hay in the fire box; the lifting force was more than expected and they lost control of the craft. The device floated nearly two kilometers but was destroyed after landing by a passing citizen.

Calendar: June 4

A Year: Day to Day Men: 4th of June

Modern Man in the Ancient Wood

On June 4, 1783, a hot-air balloon was demonstrated by Joseph and Jacques Montgolfier.

The Montgolfier brothers Joseph-Michel and Jacques-Étienne were born into a family of paper manufacturers founded in 1534 in Annonay, France. Of the two brothers, it was Joseph who was first interested in aeronautics: as early as 1775 he was building and experimenting with parachutes. He first contemplated building machines when he observed laundry drying over a fire incidentally form pockets that billowed upwards.

While living in Avignon in November of 1782 he made his first definitive experiments. Joseph Montgolfier built a box-like chamber out of very thin wood, and covering the sides and top with lightweight taffeta cloth. He crumpled and lit some paper under the bottom of the box. The contraption quickly lifted off its stand and collided with the ceiling.

Joseph recruited his brother Jacques to balloon building. They built a similar device, however scaled up to three times the dimensions of the original, making it 27 times greater in volume. They did their first test flight on December 14, 1782, lighting wool and hay underneath. The lifting power was so great, that they lost control of the craft. The device floated nearly two kilometers and was destroyed, after landing, by a passerby.

To make a public demonstration and to claim its invention the brothers constructed a globe-shaped balloon of sackcloth tightened with three thin layers of paper inside. The envelope could contain nearly 28,000 cubic feet of air and weighed 500 pounds. It was constructed of four pieces (the dome and three lateral bands) and held together by 1,800 buttons. A reinforcing fish net of cord covered the outside of the envelope.

The Montgolfier brothers flew the balloon at Annonay on June 4, 1783 in front of a group of dignitaries. The flight covered 2 km (1.2 mi), lasted 10 minutes, and had an estimated altitude of 5,200-6,600 feet. Word of their success quickly reached Paris. Étienne went to the capital to make further demonstrations and to solidify the brothers’ claim to the invention of flight.

On September 19, 1783, the Montgolfiers’ new balloon Aerostat Revelillon was flown with the first living beings in a basket attached to the balloon: a sheep called Montauciel, a duck and a rooster. The flight covered two miles at an altitude of 1500 feet and lasted eight minutes: it landed safely with all aboard surviving. Since the animals survived, King Louis XVI, who had witnessed the flight, allowed flights to proceed with human passengers.