NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY
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.
Model release not required. Property release not required.