Early in the 20th century, Russia's first pilots frequently conducted demonstration flights in large towns to demonstrate their proficiency with aircraft control. Kotelnikov developed a fascination with flying. He was a regular visitor to the Commandant
airfield, where he watched the aircraft with interest. Kotelnikov was greatly moved by the courage and commitment of Russian pilots who ventured to the skies in shaky, primitive planes, and he realized the enormous possibilities of aerial exploration. He witnessed the death of a talented Russian pilot Lev Matsievich which was such a shock that he became obsessed with the idea of constructing a parachute, to which he devoted several years of his life as well as all his personal savings. In 1911 he created his first parachute RK-1 (which stands for
Rantseviy (knapsack) or
Russian
Kotelnikova (by Kotelnikov),
1st model), that was successfully employed in 1914 during
World War I. Later on, Kotelnikov significantly improved the design of his parachute, creating new models, including RK-2 with a softer knapsack, RK-3, and a few
cargo parachutes, all of which would be adopted by the
Soviet Air Force. In 1911 he applied for a
patent to the Committee on Inventions in France and was granted the patent under the number 438612, in which he summarized the function of his parachute:The working principle of the apparatus is as follows: in case of an emergency, a pilot, wearing it on his back, could throw himself out of an aircraft, opening a knapsack by pulling a cord attached to its lock. In case of an unexpected fall the device can work quite automatically. For that purpose the lock of the parapack is connected with a carriage of an aircraft by means of a cord which would open the lock of a parapack being stretched under the weight of a falling man. At first G.Kotelnikov called his invention a safety apparatus, a knapsack-parachute and later on it got the name of RK-1. In 1912 on a road near
Tsarskoye Selo (now part of
St. Petersburg) Kotelnikov successfully demonstrated the braking effects of the parachute by accelerating a
Russo-Balt automobile to the top speed, and then opening a parachute attached to the back seat, thus inventing the
drogue parachute. In aviation, however, drag chutes were used for the first time only in 1937 by the
Soviet airplanes in the
Arctic that were providing support for the famous polar expeditions of the era, such as the first
drifting ice station North Pole-1, launched the same year. The drag chute allowed to land safely on the
ice-floes of smaller size. He produced some of the earliest cargo parachutes, and was a contemporary to the start of the parachuting sport in Russia in 1930 and the creation of the
Soviet Airborne Troops the same year (the first
paratrooping force in history). In his late years, Kotelnikov wrote a book about the invention and subsequent development of parachutes. ==Personal life, demise and legacy==