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 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, mostly tourists, crashed and caught fire during a thunderstorm on the Ljubljana Marshes, in the Municipality of Ig, between Lavrica, Črna Vas and Ig, next to Ig Street (), two hundred meters from the turn for Matena, seven kilometres south of Ljubljana. A sudden weather change caused the pilot to try to land immediately. However, the emergency landing was thwarted