Quick fuel stop at St Athan.

A prototype of the concept of connecting a car with a helicopter from the early 1960s, developed by the Helikopter Technik Wagner company.

Second prototype from 1991 of predecessor of Eurocopter EC-135. Both prototypes were used as technology demonstrators and unlike later production aircraft flew with conventional tail rotors.

The Bölkow Bo 103 was a single-seat experimental helicopter built by Bölkow Entwicklungen KG in 1961. A single prototype was built, but work was stopped in 1962 due to lack of interest on the part of the West German armed forces.

This original gyrodyne was developed and tested in 1968-1969 by the VFW-Fokker. Its unique feature was the drive concept using compressed air to drive the blades. The gyrodyne was equipped with a single turbine which drove a centrifugal compressor producing compressed air distributed to the blade tips fitted with nozzles. The main rotor was used for hovering, while the forward thrust was provided by two fans, also driven by compressed air. Project was abandoned after a few flights when it became clear that this type of propulsion was inefficient. Three prototypes were built with two preserved.