Hi Group
I was wondering if someone could help me understand an aspect of uncoordinated
flight I just can't seem to get my head around :-(
I was reading in October 2019 bEAA a Commentary from Charlie Precourt titled "
Loss of control - a survivors story". In short a Kitfox stalled and spun in
having
too much bottom rudder in the process. He didn't have a stall warning indicator.
What I can't get my head around is a commentary of recalling the aerodynamics of
uncoordinated flight that states a slip has the fuse generating lift and in
a skid the fuse generating negative lift forcing the wing having to create more
lift than in coordinated flight exasperating things and raising the stall speed.
Can anyone perhaps better explain to me specifically lift generated by the
fuselage?
Here's the paragraph that has me confused:
"At this point, it might be helpful to recall the aerodynamics of uncoordinated
flight and why a slip is okay but a skid is dangerous in the pattern. When we
fly a side-slip, for example, to help lose altitude on approach, the fuselage
is generating lift because the top rudder puts the relative wind on the lower
part of the fuselage. This added lift unloads the wings and reduces our stall
speed. On the other hand, in a skidding turn, the relative wind acts on the
upper
side of the fuselage, creating down force in the direction of weight, loading
up the wings, and increasing our stall speed. Just the act of adding the
skidding rudder can induce an immediate stall if the speed we are flying in the
turn is close to stall.'
This is exactly what happened to Nikk, the poor sole with the Kitfox.
I just can't picture how the fuse in a skid has higher pressure air on the top
of the fuse.
Thx.
Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=491716#491716
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