The Blue Max....
One of the stunt pilots used in the film was Derek Piggott. Piggott was the only pilot to agree to fly the stunt at the climax of the film in which the two rivals challenge each other to fly beneath the spans of a bridge.
Taking the role of both German pilots and with multiple takes from contrasting camera angles, he ended up flying through the wide span of the bridge, in Fermoy Co. Cork Ireland, 15 times and through the narrower span 17 times. The Fokker Dr.I triplane replica had four feet of clearance on each side when passing through the narrow span.........