A number of aircraft significant to the story had to be recreated. The first was an essentially static X-1 that had to at least roll along the ground and realistically "belch flame" by a simulated rocket blast from the exhaust pipes. A series of wooden mock-up X-1s were used to depict interior shots of the cockpit, the mating up of the X-1 to a modified B-29 fuselage and bomb bay and ultimately to recreate flight in a combination of model work and live-action photography. The "follow-up" X-1A was also an all-wooden model.