Aeronca 11 Chief

Infobox Aircraft
name=Aeronca Chief


caption=
type=Light utility aircraft
manufacturer=Aeronca
designer=Raymond F. Hermes at Aeronca
first flight=1945
introduced=1946
retired=
status=
primary user=
more users=
produced=1946-1950
number built=over 2,300
unit cost=
variants with their own articles=Hindustan Aeronautics Pushpak

:"Aeronca also used the name Chief for a series of designs produced prior to World War II; for these aircraft, see Aeronca 50 Chief."

The Aeronca Chief is a single-engine, two-seat, fixed conventional gear airplane which entered production in the United States in 1945. Designed for flight training and personal use, the Chief was produced in the United States between 1946 and 1950. The Chief was known as a basic gentle flyer with good manners, intended as a step up from the 7AC Champion which was designed for flight training. Like many classic airplanes, it has a significant adverse yaw, powerful rudder and sensitive elevator controls. It had a well appointed cabin, with flocked taupe sidewalls and a zebra wood grain instrument panel. There was never a flight manual produced for the 11AC or 7AC series airplanes, as a simple placard system was deemed enough to keep a pilot out of trouble.

Production history

The model 11 Chief was designed and built by Aeronca Aircraft Corporation. While it shared the name "Chief" with the pre-war models, the design was not a derivative. Rather, the post-war 11AC Chief was designed in tandem with the 7AC Champion ("Champ")—the Chief with side-by-side seating and yoke controls, and the Champ with tandem seating and joystick controls. The intention was to simplify production and control costs by building a pair of aircraft with a significant number of parts in common; in fact, the two designs share between 70% and 80% of their parts. The tail surfaces, wings, ailerons, landing gear, and firewall forward—engine, most accessories, and cowling—are common to both airplanes. The Chief and the larger Aeronca Sedan also share selected parts, the control wheels, some control system parts, rudder pedals and control systems, so parts passed from plane to plane to save costs. Production costs and aircraft weights were tightly controlled and Aeronca was among the first to use a moving conveyor assembly line, with each stage taking about 30 minutes to complete.

The 11AC Chief entered production at Aeronca in early 1946, with upgraded versions introduced as the 11BC (also called the "Chief") and 11CC "Super Chief," in June of 1947 and 1948, respectively. Aeronca was at the time headquartered at Middletown, Ohio, but production facilities there were heavily utilized with the 7AC Champion line; because of this, the model 11 aircraft were assembled at the Dayton Municipal Airport in Vandalia, Ohio. While the Vandalia location was first used only for the assembly of parts fabricated at Middletown, activities there later expanded to include some fabrication work. Only later, toward the end of production did the Chief line return to Middletown.

Aeronca ceased all production of light aircraft in 1951. Production of the Chief, which had been outsold by its sibling the Champ by a margin of nearly 4 to 1, had already ended by 1950, with only a few planes produced in 1948-1949. This marked the last time the Chief design was built in the United States.

The design was sold in the mid-1950s to E. J. Trytek, who held the design until the late 1960s or early 1970s. The HUL-26 Pushpak, built by Hindustan Aeronautics between 1958 and 1968, was very similar to the Super Chief. Some sources say that the Pushpak was produced under license from Trytek, while others suggest that the Pushpak design resulted from reverse engineering. The Pushpak can be identified by the smaller rudder surface which is squared off at mid-fin and the larger vertical tail that is found on the 11CC.

Ownership of the Chief design passed to Bellanca Aircraft Corporation in the early 1970s, around the same time they acquired the 7 series Champion/Citabria and its derivative designs. In 1973 Bellanca considered producing an updated version of the Chief for flight training, but the aircraft never entered production. The model 11 designs are currently owned by American Champion Aircraft Corporation, which acquired them sometime before 1991. Ownership of the design in the period between Bellanca's liquidation in 1982 and the American Champion acquisition is unclear.

Design

Like the Taylorcraft B, Piper Vagabond, Cessna 120/140, and Luscombe 8 with which it competed, the Chief features side-by-side seating. As with many light aircraft of the time, including the Taylorcraft B and Piper Vagabond, the Chief's fuselage and tail surfaces are constructed of welded metal tubing. The outer shape of the fuselage is created by a combination of wooden formers and longerons, covered with fabric. The cross-section of the metal fuselage truss is triangular, a design feature which can be traced all the way back to the earliest Aeronca C-2 design of the late 1920s.

The strut-braced wings of the Chief are, like the fuselage and tail surfaces, fabric covered, utilizing aluminum ribs and wood spars. The landing gear of the Chief is in a conventional arrangement, with steel tube main gear which use an oleo strut for shock absorption, and a steerable tailwheel.

All of the models—11AC, 11BC, and 11CC—were approved as seaplanes, with the addition of floats and vertical stabilizer fins; the seaplane versions were designated the S11AC, S11BC, and S11CC, respectively.

Variants

Introduced in 1946, the 11AC was the first version of the design and utilized the Continental A-65-8 engine of 65 horsepower, featuring also a McDowell mechanical starter. This McDowell starter was taken from the automotive industry and involved a spring loaded cam device that would spin the propeller through a compression stroke by a pull on a cabin floor mounted lever. The S11AC was a float plane. Also, Aeronca built a basic stripped down version of the 11AC called the "Scout," a trainer aircraft. The 11BC model, introduced in 1947, upgraded the engine to a Continental C-85-8F of 85 horsepower; the design was otherwise substantially similar to the 11AC save for the addition of an extended dorsal fin in front of the vertical stabilizer for the purpose of increasing directional stability. The 11CC "Super Chief" of 1948 brought an upgraded interior, toe brakes on the pilot’s side, and balanced elevators.

In 1973 Bellanca built and flew a prototype trainer based on the model 11. The Bellanca Trainer featured a tricycle landing gear arrangement and appeared to share many parts with the 7ECA Citabria (a derivative of the Champ design). The Bellanca trainer's cowling, wings and struts, main gear, and horizontal tail surfaces all appeared to have come from the Citabria. The vertical stabilizer and rudder appeared similar, though shorter vertically in the prototype. They were extended to full size after flight testing. The fuselage of the trainer featured a rear window. The cabin had a taller modernized instrument panel and other furnishings. The design was never put into production after being shown to dealers in 1973.

pecifications (1946 11AC Chief)

aircraft specification

plane or copter?=plane
jet or prop?=prop

crew=one pilot
capacity=one passenger
length main= 20 ft 10 in
length alt= 6.4 m
span main= 36 ft 0 in
span alt= 11 m
height main= 6 ft 10 in
height alt= 2.1 m
area main= 175.5 ft²
area alt= 16.3 m²
airfoil= NACA 4412
empty weight main= 725 lb
empty weight alt= 328.9 kg
loaded weight main= 1,250 lb
loaded weight alt= 567 kg
useful load main= 525 lb
useful load alt= 238.1 kg
max takeoff weight main= 1,250 lb
max takeoff weight alt= 567 kg
more general=

engine (jet)=
type of jet=
number of jets=
thrust main= lbf
thrust alt= kN
thrust original=
thrust more=
afterburning thrust main= lbf
afterburning thrust alt= kN
engine (prop)= Continental A-65-8
type of prop=
number of props= 1
power main= 65 hp
power alt= 48.5 kW
power original=
power more=
max speed main= 105 mph
max speed alt= 169 km/h
max speed more=
cruise speed main= 95 mph
cruise speed alt= 152.9 km/h
cruise speed more=
never exceed speed main=
never exceed speed alt=
stall speed main= 40 mph
stall speed alt= 64.4 km/h
stall speed more=
range main= 330 mi/550 mi with aux fuel tank
range alt= 531.1 km
range more=
ceiling main= 10,800 ft
ceiling alt= 3291.9 m
climb rate main= 500 ft/min
climb rate alt= 2.54 m/s
loading main= 7.1 lb/ft²
loading alt= 34.8 kg/m²
thrust/weight=
power/mass main= 19.2 lb/hp
power/mass alt= 11.7 kg/kW
more performance=

armament=

References

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* Aircraft specification no. A-796. Revision 14. (Aug. 1, 1991.) Department of Transportation. Federal Aviation Administration.
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* Type certificate data sheet no. A-761. Revision 17. (Aug. 1, 1991.) Department of Transportation. Federal Aviation Administration.

External links

* [http://www.aeroncapilots.com National Aeronca Association]
* [http://www.aeronca.org/ Aeronca Aviators Club]
* [http://www.geocities.com/CapeCanaveral/Hangar/3287/BellancaTrainer.html The Bellanca Trainer, with 3-view and history]

ee also

aircontent
related=
* Aeronca Sedan
* Aeronca Champ
similar aircraft=
* Cessna 120/140
* Luscombe 8
* Piper Vagabond
* Taylorcraft B