Helicopter model. This model of a helicopter was used to investigate the interaction between a pair of rotor blades mounted in tandem on a helicopter. It is suspended inside a wind tunnel for aerodynamic testing. Photographed at the National Physical Laboratory,Teddington,UK,in 1957 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / NATIONAL PHYSICAL LABORATORY (c) CROWN COPYRIGHT |
Bildgröße: | 4961 px × 3667 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |