On 4/19/2019 11:44 AM, Max Power via KRnet wrote:
I was under the impression that if the craft didn't have flaps or the
control surface took up the the majority of the wing that the technical
term should be flaperons,
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Ailerons that span the entire length of the trail edge of the wing but
can not move in unison up or down to act as flaps are still called
ailerons. They can be rigged so one goes down a greater degree than the
other goes up or vise versa, as in the KR design (differential ailerons)
but they are still just ailerons. This is done to help eliminate adverse
yaw. The up aileron goes up double to what the down aileron goes down
as I recall. It works great on the KR as I can enter a 30 degree bank
with no rudder input and the ball remains centered.
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I had been mentally designing a way to be able to alter their linkage to
act similar to the conventional flap and that's what led me to my main
question actually. If I figure out that solution with redundancy, you'll be
the third to know after me and the patent office.
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Don't head to the patient office just yet as the combination I think
you're looking for has been around since I was a child and I'm no
youngster any more. It's called a "mixer" and has been used with
"flaperons" even before Beech used a mixer on the V-tail Bonanza to
create a "rudder-vator. The elevators move together up and down for
pitch but will move independent of pitch (one down and the other up)
with rudder input for yaw control.
The Rebel I've been test flying has what are called "flaperons". The
flap / aileron system can be set up two ways. The flaps can operate
solely as flaps and ailerons can operate solely as ailerons or, in the
case of this Rebel, the ailerons and flaps are tied together to move as
a single unit. The system incorporates a "mixer" where the flap handle
will lower the flaps and ailerons together to act as flaps but still
allow each side to operate as ailerons. That design can be a bit tricky
as you can't lower the "flaps" to the point where they don't have any
more movement available to operate as ailerons. I seem to recall other
"modern" designs use similar systems and I'm not so sure the design
doesn't go way back before the bonanza.
The Rebel system is designed to also place the "flaperons" in a trail
edge up (above zero degrees) to kill some amount of lift in cruise, a
design also used in some sailplanes. When you eliminate some lift you
also eliminate some drag and that will give you some amount of
additional speed. In the case of the Rebel I'm testing I would see and
increase of speed at cruise of about 5 to 7 mph.
I hope this explanation speaks to the system you're looking for. If you
want I could try to point you to some drawings for the system. It's
fairly simple system when you see the drawings.
Larry Flesner
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