Talk:Townend ring

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Ring adding 10 - 15 mph speed[edit]

The article doesn't specify at what speed this speed increase occurs so it's quite meaningless a statement. Quite how the tiny ring is supposed to develop 12 - 30% more thrust (which is what a 10 mph increase suggests over a range of air speeds) needs explaining. Increases in top speed are more than likely due to less power loss to drag than increased thrust due to more or less free expansion in an open, short metal ring which has no forward facing reaction surfaces on which engine-heated air could exert pressure. Waerloeg (talk) 13:36, 6 August 2014 (UTC)

The article does currently say it's a drag effect. GraemeLeggett (talk) 09:36, 8 August 2014 (UTC)
Your reply has very little to do with what I wrote. The article says:
It was also said to generate forward thrust from the expansion of the air as it passed over the engine, adding 10 to 15 mph to the aircraft's top speed.
That's the dubious part. Waerloeg (talk) 19:26, 8 August 2014 (UTC)
"It was also said..." is a phrasing that implies doubt about the claim. GraemeLeggett (talk) 18:55, 9 August 2014 (UTC)