Image sources:

• – The Christmas Bullet :
  http://www.aviastar.org/pictures/usa/christmas_bullet_1.jpg
  http://www.history.org.uk/library/0808/0000/0084/kaiser_295.jpg
• – Goodyear Inflatoplane :
  http://www.membrana.ru/images/articles/1089811600-1.jpeg
• – Hiller VZ-1 :
  http://www.memeticians.com/2009/05/18/cobra_commander.jpg
  http://upload.wikimedia.org/wikipedia/en/thumb/6/6f/Vz1.JPG/250px-Vz1.JPG
• – Fieseler Fi 103R :
  http://media.giantbomb.com/uploads/1/13216/877502-mug_leonidas_super.jpg
  http://en.wikipedia.org/wiki/File:Fieseler_Fi-103_Reichenberg.jpg
• – The Parachute Coat :
  http://upload.wikimedia.org/wikipedia/commons/4/43/Franz_Reichelt_1912_-2.jpg