Townend ring
![](https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/Pratt_%26_Whitney_R-985_AN14B.jpg/220px-Pratt_%26_Whitney_R-985_AN14B.jpg)
" 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 ).