Editing Max Valier (section)

==Biography==
Valier was born in [[Bolzano|Bozen]] in the [[County of Tyrol]] (now [[South Tyrol]]) and in 1913 enrolled to study [[physics]] at the [[University of Innsbruck]]. He also trained as a [[machinist]] at a nearby factory. His studies were interrupted by the First World War, during which he served in the [[Austro-Hungarian Empire|Austro-Hungarian]] army's air corps as an aerial observer.

After the war, Valier did not return to his studies, but became a freelance science writer. In 1923, he read [[Hermann Oberth]]'s landmark book ''[[Die Rakete zu den Planetenräumen]]'' (''The Rocket into Interplanetary Space'') and was inspired to write a similar work to explain Oberth's ideas in terms that could be understood by lay persons. With Oberth's assistance, he published ''[[Der Vorstoß in den Weltenraum]]'' (''The Advance into Space'') the following year. It was an outstanding success, going through six editions before 1930. He followed this with numerous articles on the subject of space travel, with titles like "Berlin to New York in One Hour" and "A Daring Trip to Mars".
[[File:Opel RAK1 2.jpg|thumb|Opel RAK.1 - World's first public flight of a manned  rocket-powered plane on September 30, 1929]]

In 1928 and 1929, he worked with [[Fritz von Opel]] on a number of rocket-powered cars and [[aircraft]] within the world's first large-scale rocket program [[Opel-RAK]].<ref>"Das RAK-Protokoll", a 25 minutes documentary on the Opel RAK program https://opel-tv-footage.com/v/The%20RAK%20Protocoll?p=4&c=86&l=1</ref> For von Opel, these experimentations had also a very positive public relations effect for the [[Opel]] company, and for Valier, they were a way of further raising interest in rocketry amongst the general population. [[Friedrich Sander]] in these endeavours was chosen as the supplier of solid-fuel rocket motors. Valier's and von Opel's activities led to land and rail vehicle speed records, and eventually to the world's first rocket plane. The first public flight took place on September 30, 1929, piloted by von Opel. After the [[Opel RAK.1]] flight, caused by the [[Great Depression]], the Opel RAK collaboration came to an end, von Opel left Germany in 1930, immigrated to the US and eventually to France and Switzerland. Valier then continued the rocket development on his own.

By the late 1920s, the VfR was focusing its efforts on liquid-fuelled rockets. Their first successful test firing with liquid fuel (five minutes) occurred in the Heylandt plant on 25 January 1930. On 19 April 1930 Valier performed the first test drive of a [[rocket car]] with [[liquid propulsion]], the ''Valier-Heylandt Rak 7''.

Valier was killed less than a month later when an alcohol-fuelled rocket exploded on his test bench in [[Berlin]].  His [[Mentorship|protégé]] [[Arthur Rudolph]] went on to develop an improved and safer version of Valier's engine.