Reynolds and production artist Ron Cobb created the BV-38 flying wing based on the Horten Ho 229, the Northrop N-1M and the Vought V-173. Constructed by the British engineering firm Vickers, it was dismantled and shipped to Tunisia. It was not designed to be flight-worthy, only to serve as a source of danger from its propellers. The plane was abandoned in Tunisia and slowly dismantled over the following decade by souvenir hunters before being demolished. The fight between Jones and the German underneath the plane was mainly improvised; Spielberg had to restrain himself from making it too long as each new idea led to another. During the fight, the moving vehicle rolled over Ford's foot and towards his knee before it was stopped. It took 40 crew members to move it off of him. He avoided injury through a combination of the extreme Tunisian heat making the tire soft and the ground being covered in sand. Dysentry had left the production with a lack of stuntmen, and Spielberg had Marshall stand in as the flying wing pilot. The three-day shoot was one of Spielberg's more difficult scenes to film, and he was reported saying he wanted to go home.