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SECTION II
DESIGN INFORMATION
ENGINE AND PROPELLER
The Piper Cherokee 180 “C” is powered by a Lycoming O-360-A3A four
cylinder, direct drive, horizontally opposed engine rated at 180 HP at 2700
RPM. It is furnished with a starter, 35 ampere 12 volt alternator, shielded
ignition, vacuum pump drive, fuel pump, and a dry, automotive type
carburetor air filter.
The exhaust system is of the cross-over type to reduce back pressure and
improve performance. It is made entirely from stainless steel and is equipped
with dual mufflers. A heater shroud around the mufflers is provided to supply
heat for the cabin and windshield defrosting.
The Sensenich M76EMMS fixed-pitch propeller is made from a one-piece alloy
forging.
STRUCTURES
All structures are of aluminum alloy construction and are designed to ultimate
load factors well in excess of normal requirements. All exterior surfaces are
primed with etching primer and painted with acrylic enamel.
The wings are attached to each side of the fuselage by inserting the butt ends
of the respective main spars into a spar box carry-through which is an integral
part of the fuselage structure, providing in effect a continuous main spar with
splices at each side of the fuselage. There are also fore and aft attachments at
the rear spar and at an auxiliary front spar.
The wing airfoil section is a laminar flow type, NACA652-415 with the
maximum thickness about 40% aft of the leading edge. This permits the main
spar carry-through structure to be located under the rear seat providing
unobstructed cabin floor space ahead of the rear seat.
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