Talk:Ducted fan

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I removed the sentence which implied 'high-bypass ducted fans ... are optimized for high-speed flight.' Based on the actual use of turbofans in the US military aircraft, high-bypass turbofans are found in a handful of combat aircraft (A-10 Warthog being one of them, with a bypass ratio of ~ 8:1.) The supersonic fighters F14, F15, F16, F18, and Mig-29 all use low-bypass ( < 0.8:1) turbofans. High-bypass turbofans are more efficient (than pure jet-engines) at high subsonic velocities.

anonymous (68.122.56.147) - 07/10/2005

"An unshrouded propeller is limited since their tip speeds approach the sound barrier at lower rpms." Shouldn't it say higher RPMs? -(Simm 11:41, 28 April 2006 (UTC))

I believe it should read 'lower rpms than an equivalent shrouded propeller'. ericg ✈ 16:36, 28 April 2006 (UTC)

[edit] Kinds of ducted fans

This article makes the assumption that the only ducted fan is an airplane propulsive device. Ducted fans are a very common high-efficiency cooling fan design. For instance, almost all PC cooling fans are a simple form of ducted fan.

Should there be a separate page on the more common use of 'ducted fan' to refer to these air movers, or should there just be a short bit added to the front of this article that would mention other uses of the term? Loren.wilton (talk) 02:56, 11 March 2008 (UTC)