On Tue, 12 Aug 2008 02:42:16 -0700, Darryl Ramm wrote:

The
comment was if you stand on the rudder alone a glider will turn. Do you
really think that was being advocated as a method to use?

No, but it is a useful reminder of the way some aircraft react.

I've always known that was possible to turn using just the rudder GIVEN
THE RIGHT AIRFRAME, because otherwise it would be impossible to fly an RC
model that lacks ailerons: I flew single channel rudder-only models when
I was a lad.

Eric specified it exactly right: to turn an aircraft using just the
rudder requires it to have fairly generous dihedral. The yaw induces a
turn as a secondary effect because dihedral increases the effective AOA
of the advancing wing while reducing it for the retreating one. If the
aircraft has little or no dihedral this secondary effect can be ignored.

All rudder only or rudder & elevator RC models have generous amounts of
dihedral.


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martin@ | Martin Gregorie
gregorie. | Essex, UK
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