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A Townend ring is a narrow-
Chapter 5: High-speed Cowlings, Air Inlets and Outlets, and Internal-Flow Systems: The ramjet investigation
Although superior to earlier cowlings, and uncowled engines in terms of drag and cooling, above the NACA cowling was more efficient and soon replaced it in general use.
Examples of aircraft with Townend rings include the Boeing P-26 Peashooter, the Vickers Wellesley, the
The Spotters Glossary
* * * {{Aircraft components Aircraft propulsion components
A Townend ring is a narrow-chord
Chord may refer to:
* Chord (music), an aggregate of musical pitches sounded simultaneously
** Guitar chord a chord played on a guitar, which has a particular tuning
* Chord (geometry), a line segment joining two points on a curve
* Chord ( ...
cowling ring fitted around the cylinders of an aircraft radial engine to reduce drag and improve cooling.
Development
The Townend ring was the invention of Dr.Hubert Townend
Hubert is a Germanic masculine given name, from ''hug'' "mind" and ''beraht'' "bright". It also occurs as a surname.
Saint Hubertus or Hubert (c. 656 – 30 May 727) is the patron saint of hunters, mathematicians, opticians, and metalworkers. ...
of the British National Physical Laboratory in 1929. Patents were supported by Boulton & Paul Ltd in 1929. In the United States it was often called a "drag ring". It caused a reduction in the drag of radial engines and was widely used in high-speed designs of 1930–1935, before the long-chord NACA cowling came into general use. Despite suggestions of it exploiting the Meredith effect, low airspeeds, low temperature differences and small mass flows make that unlikely, particularly when combined with the lack of flow control as the air exits the cowling.Becker, J.; ''The high-speed frontier: Case histories of four NACA programs, 1920–1950'', SP-445, NASA (1980)Chapter 5: High-speed Cowlings, Air Inlets and Outlets, and Internal-Flow Systems: The ramjet investigation
Although superior to earlier cowlings, and uncowled engines in terms of drag and cooling, above the NACA cowling was more efficient and soon replaced it in general use.
Examples of aircraft with Townend rings include the Boeing P-26 Peashooter, the Vickers Wellesley, the Fokker D.XVI
The Fokker D.XVI (sometimes written as Fokker D.16) was a sesquiplane fighter aircraft developed in the Netherlands in the late 1920s.
Development
The Fokker D.XVI was a conventional, single-bay sesquiplane with staggered wings braced with V- ...
and the central engine on the Junkers Ju 52
The Junkers Ju 52/3m (nicknamed ''Tante Ju'' ("Aunt Ju") and ''Iron Annie'') is a transport aircraft that was designed and manufactured by German aviation company Junkers.
Development of the Ju 52 commenced during 1930, headed by German Aeros ...
/3m.
Notes
References
External links
The Spotters Glossary
* * * {{Aircraft components Aircraft propulsion components