text: Five Unusual Luftwaffe Ideas – YouTube Video | Ups Downs Family History
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  Five Unusual Luftwaffe Ideas – YouTube Video
  5 Luftwaffe 'Ideas' That Worked…Sort of: https://www.youtube.com/watch?v=LjBIzc4groM (about 11:29 minutes long)
  #5 Messerschmitt Me-323 https://en.wikipedia.org/wiki/Messerschmitt_Me_323
  #4 Automatic Triggers (SG 113, 116, and 500) – https://ww2aircraft.net/forum/threads/sonder-geraet-116.44901/
  #3 BR-21 Drehling – https://en.wikipedia.org/wiki/Werfer-Granate_21
  #2 Bordflammenwerfer or Flammenwerfer 'Gero'
  http://weaponsman.com/?p=6323
  #1 Evaporation (or Evaporative) Cooling – https://www.enginehistory.org/Accessories/EvapCooling/EvapCooling1.shtml and https://en.wikipedia.org/wiki/Heinkel_He_100 Other countries also tried this technique.