Piper COMANCHE - Page 9

Ihe PIpef CosuncAe 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~eer 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 in 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 of tlie structure; win5 are attached
also at the rear spar and at an auxiliary front spat.
The wing airfoil section is a laminar flow ty e, NACA642A215,
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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 he reur acat.
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