In article . net,
"Hilton" wrote:


On the ground while taxiing, sure it does, just take your feet off the
brakes and away you go. At flying speed however, it (perhaps surprisingly)
causes drag.


But not as much drag as a windmilling propellor.

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html