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I h e
P I p e f C o s u n c A e
SECTIoN
1
The
180
uses
the Harkell,
madel
HC92ZK8D
or
the
McCnuley,
model
2D36Clk
The 250
uses
the Hartzell, model HC82XKID. AII
propeilers
are constallt speed
controllable.
111. .
Fuselage and
Wing Structures:
Structures are of d ~ e e r aluminum construction, and are designed
to
uitimate
load
factors
well
in excess of mormal
wquiremnts.
All
camponents are
campktely zinc
chron~aie
primed,
exterior surfaces
are enameled
as
well.
The
main spars
aE the wings are joined with high
strength butt
fitting9
i n
the center
of the
fuselage,
making
in effect
a
c~ndnuous
~nain
spar.
Main spurs
are
nuached
to the
fuselage
at
the side 01
the fuaelage and
in
the
cetkter
o f
tlie
structure; w i n 5 are
attached
also at
the rear spar
and at
an
auxiliary
front spat.
The wing airfoil
section is
a
laminar flow
ty
e,
NACA642A215,
I '
with
maximum thickness
about
403,
aft
of
the
eading
edge.
This
permits the tnuin
spar, located nt
the
point of maximum
thich~ess,
lo
pass through
the
cabin
urrder
the
rear neat,
pruvidiq ul)~h!iW~ctetl
cabin llour
space ahead
BE
h e
reur
acat.
7
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