Ed Yost own interests turned toward reviving the lost practice of manned hot-air ballooning. This technology had first been invented in France by in the late 18th century by pioneers led by the Montgolfier brothers, but under the Montgolfier system, the balloon's air was heated by a ground fire prior to the balloon being released. The inherent danger of this type of balloon flight led to the system being abandoned when hydrogen and later helium became available. One of Yost's key engineering insights was that a hot-air balloon could be made to carry its own fuel. The invention of relatively light burners
2012 Ljubljana Marshes hot air balloon crash an improper landing procedure, as well as ignoring the bad weather warning and the flight rules. In a preliminary hearing, the pilot denied all these statements, pleading not guilty to the charge of causing general danger. The court trial began in November 2016. Two years later, the district court exonerated the defendant, based on an opinion of a foreign expert. 2012 Ljubljana Marshes hot air balloon crash The 2012 Ljubljana hot air balloon crash occurred on the Ljubljana Marshes in central Slovenia on 23 August 2012, killing six people while 26 others survived. A hot air balloon carrying 32 passengers,