Ken,
There is some other reasoning that shows up in the Swift literature when
one really looks for it. The designers knew that conventional wisdom
says that airplanes are safer and less deadly if the root area of the
wing stalls ahead of the outer portion of the wing. The usual way to do
this is to put a negative twist in the wing to slightly reduce the angle
of incidence toward the wing tips. They also knew they could achieve
the same result with slots. They concluded it was less expensive to
build a straight, untwisted wing and then add the slots. Pure economics.
Jim Nichols
Tullahoma, TN USA
On 8/11/2015 5:20 PM, Ken Norton wrote:
Jim, I would think that the slots probably would improve aileron
effectiveness at low speeds and help prevent the outer wings from stalling
during roll corrections.
The slots are essentially full time slats and would improve the airflow
over the top of the wing and prevent separation as the angle of attack
increases. This would keep the ailerons working in both the rise and lower
position which should also make it where you don't have to ride the rudder
as much in or near stall.
AG
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