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Townend(sp?) Engine Cowling  
User currently offlineLZ-TLT From Germany, joined Apr 2001, 431 posts, RR: 0
Posted (13 years 6 months 3 hours ago) and read 2552 times:

Doing some research on 20's and 30's aircraft I noticed a variety of aircraft with radial engines being fitted with the so-called Townend(or Townsend) engine cowling. Could somebody explain what the reason and the benefits of using such a cowling were?

5 replies: All unread, jump to last
User currently offlineL-188 From United States of America, joined Jul 1999, 30263 posts, RR: 57
Reply 1, posted (13 years 6 months 3 hours ago) and read 2526 times:

Wasn't that the equivlent to the NACA cowling?

Just shooting from the hip here folks.

User currently offlineFBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 6
Reply 2, posted (13 years 6 months ago) and read 2472 times:

The Townend Ring was a British design that appeared just after the First World War and was extensively used on British A/c until the early -30's.I'm not sure but I think NACA developed this design into the NACA Cowling which had a somewhat longer chord and better airflow characteristics on the inside to aid cylinder cooling.

"Luck and superstition wins all the time"!
User currently offlineLZ-TLT From Germany, joined Apr 2001, 431 posts, RR: 0
Reply 3, posted (13 years 6 months ago) and read 2453 times:


So the benefits of the Townend Ring were better airflow for engine cooling?

User currently offlineLapa_saab340 From France, joined Aug 2001, 403 posts, RR: 4
Reply 4, posted (13 years 5 months 4 weeks 17 hours ago) and read 2353 times:

The Junkers Ju-52 is a good example with both Townend and NACA cowlings (Center engine had the Townend ring, and the two wing engines the NACA cowls)


User currently offlineFBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 6
Reply 5, posted (13 years 5 months 3 weeks 6 days 16 hours ago) and read 2330 times:

Yes,LZ-TLT,the result was better cooling.By tapering the aft opening,the air that was heated and expanded around the engine had to accellerate through the cowling,thus increasing cooling efficiency.
The P-51 Mustang received a 15 mph speed increase by the radiator cooling air.Sort of jet effect,really.Whether this was the case with Townend/NACA cowlings too,I don't know.

"Luck and superstition wins all the time"!
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