LZ-TLT
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Townend(sp?) Engine Cowling

Sat Aug 17, 2002 7:19 pm

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?
 
L-188
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RE: Townend(sp?) Engine Cowling

Sat Aug 17, 2002 7:58 pm

Wasn't that the equivlent to the NACA cowling?

Just shooting from the hip here folks.
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FBU 4EVER!
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RE: Townend(sp?) Engine Cowling

Sat Aug 17, 2002 10:35 pm

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.
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LZ-TLT
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RE: Townend(sp?) Engine Cowling

Sat Aug 17, 2002 10:54 pm

FBU 4EVER,

So the benefits of the Townend Ring were better airflow for engine cooling?
 
lapa_saab340
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RE: Townend(sp?) Engine Cowling

Mon Aug 19, 2002 5:26 am

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)

Cheers
 
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RE: Townend(sp?) Engine Cowling

Tue Aug 20, 2002 6:29 am

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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