On 13 May 1971, Denis Prost and Jean Marie Besse broke two speed records in the Gazelle helicopter class: 307km/h over 3 km and 296km/h over a 100 km closed course.
On 13 May 1971, Denis Prost and Jean Marie Besse broke two speed records in the Gazelle helicopter class: 307km/h over 3 km and 296km/h over a 100 km closed course.