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Re: Misconceptions: adverse yaw



At 10:23 AM 8/14/99 -0500, brian whatcott wrote:

However, if you take flying lessons in a light airplane, as other
contributors undoubtedly have,

I'm a flight instructor.

you will find that there are some
current aircraft that DO react in this orthodox way: adverse drag
provides a perverse effect when attempting to roll left using aileron
control only: the nose yaws to the right initially.

1) You say "some" current aircraft. I would say "all" current aircraft
react in the orthodox way, that is, they will roll left when left aileron
deflection is applied, throughout all normal regimes of flight; it's a
certification requirement. (The only semi-micro exception is for certain
aerobatic aircraft flying very near the stall, in which case ailerons don't
work and roll control is quite tricky, far beyond the scope of this
discussion.)

2) If you want to get picky, differential aileron drag cannot cause adverse
yaw during a steady roll. You probably should have attributed adverse yaw
to _twisted lift_ plus a little yaw-axis inertia etc. as described in
http://www.monmouth.com/~jsd/how/htm/yaw.html#sec_adverse_yaw



This was however NOT the Flyer's modus.

Really? Please explain the details and/or provide a reference.

Thanks --- jsd