Townend ring

" Pratt & Whitney R-985 " star engine with Townend ring

A townend ring is an engine cowling for a radial engine . An aerodynamically shaped ring is attached above the cylinder heads of the engine. This ensures a defined air flow through the motor and the reduction of turbulence without impairing the cooling.

It is named after its developer Hubert Townend .

The idea of the Townendring was completed with the NACA hood . Townendrings are no longer used today. They were only used in the 1920s and 1930s .

Individual evidence

^ A History of Aerodynamics
↑ James R. Hansen, Edited by Pamela E. Mack: From engineering science to big science . the NACA and NASA Collier Trophy research project winners. Ed .: NASA. Washington DC 1998, ISBN 0-16-049640-3 , Chapter 1: Engineering Science and the Development of the NACA Low-Drag Engine Cowling, pp. 17 ( available online ).

[1] A History of Aerodynamics

[Hansen-2] James R. Hansen, Edited by Pamela E. Mack: From engineering science to big science . the NACA and NASA Collier Trophy research project winners. Ed .: NASA. Washington DC 1998, ISBN 0-16-049640-3 , Chapter 1: Engineering Science and the Development of the NACA Low-Drag Engine Cowling, pp. 17 ( available online ).