Charles Renard was a French military engineer. After the Franco-Prussian War
The Franco-Prussian War or Franco-German War, often referred to in France as the 1870 War was a conflict between the Second French Empire and the Kingdom of Prussia. Prussia was aided by the North German Confederation, of which it was a member, and the South German states of Baden, Württemberg and...
of 1870/71 he started work on the design of air ships at the French army aeronautical department. Together with Arthur C. Krebs
Arthur Constantin Krebs was a French officer and pioneer in automotive engineering....
and his brother Paul, he constructed in 1884 the dirigible war balloon
A balloon is a type of aircraft that remains aloft due to its buoyancy. A balloon travels by moving with the wind. It is distinct from an airship, which is a buoyant aircraft that can be propelled through the air in a controlled manner....
La France (airship)
The La France was a French Army airship launched by Charles Renard and Arthur Constantin Krebs in 1884. Collaborating with Charles Renard, Arthur Constantin Krebs piloted the first fully controlled free-flight with the La France. The long, airship, electric-powered with a 435 kg battery...
", which had its maiden flight
The maiden flight of an aircraft is the first occasion on which an aircraft leaves the ground of its own accord. This is similar to a ship's maiden voyage....
on 1884-08-09 and was presented at the Paris Exposition Universelle (1889)
Exposition Universelle (1889)
The Exposition Universelle of 1889 was a World's Fair held in Paris, France from 6 May to 31 October 1889.It was held during the year of the 100th anniversary of the storming of the Bastille, an event traditionally considered as the symbol for the beginning of the French Revolution...
He also proposed a now widely used system of preferred number
In industrial design, preferred numbers are standard guidelines for choosing exact product dimensions within a given set of constraints....
s that was later named after him and became international standard
International standards are standards developed by international standards organizations. International standards are available for consideration and use, worldwide...
International Organization for Standardization
The International Organization for Standardization , widely known as ISO, is an international standard-setting body composed of representatives from various national standards organizations. Founded on February 23, 1947, the organization promulgates worldwide proprietary, industrial and commercial...
3. It helped the French army to reduce the number of different balloon rope
A rope is a length of fibres, twisted or braided together to improve strength for pulling and connecting. It has tensile strength but is too flexible to provide compressive strength...
s kept on inventory
Inventory means a list compiled for some formal purpose, such as the details of an estate going to probate, or the contents of a house let furnished. This remains the prime meaning in British English...
from 425 to 17.