Re: Misconceptions: adverse yaw

[John Denker <jsd@MONMOUTH.COM>]

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