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Piper Aztec




The Piper PA-23, named '''Apache''' and later '''Aztec''', was the first twin-engine aircraft built by Piper Aircraft .

Originally to be named the "Twin-Stinson" and designed as a four-seater low-wing all-metal ; 1,231 were built. In 1958 , the Apache 160 was produced by upgrading the engines to 160 hp (119 kW), and 816 were built before being superseded by the '''Apache 235''', which went to 235 hp (175 kW) engines and swept tail surfaces (119 built).

Declining sales of the Apache prompted the redesign dubbed PA-23-250 Aztec, with 250 hp (186 kW) Lycoming . The first models were delivered with O-540 Lycoming carburetor engines. These first models came in a five-seat configuration which became available in 1959 . The later models of the Aztec were equipped with IO-540 fuel-injected engines and six-seat capacity, and continued in production until 1982 . There were also turbocharged versions of the later models, which were able to fly at higher altitudes.

Among other light twin-engined airplanes of its generation, the Aztec was known for its good load hauling, long endurance, stable handling, and respectable single-engine performance, at the cost of higher fuel consumption and a draggier (slower) airframe. Part of the drag was due to use of the same basic wing design (albeit with substantially different dimensions and construction) as the Piper Cub series of aircraft. The Piper Cub airfoil gave the Aztec superior short field operation characteristics at the price of lower performance at cruising speeds.

The US Navy acquired 20 Aztecs, designating them UO-1, which changed to '''U-11A''' when unified designations were adopted in 1962 .


MILITARY OPERATORS



SPECIFICATIONS (MODEL E, NORMALLY ASPIRATED)


  plane Or Copter plane
  jet Or Prop prop
  crew one, pilot
  capacity 6 passengers (4 in the early models)
  length Main 31 ft 3 in
  length Alt 951 m
  span Main 37 ft 2 in
  span Alt 113 m
  height Main 10 ft 4 in
  height Alt 314 m
  area Main 208 ft&2
  area Alt 193 m&2
  empty Weight Main 3,300 lb
  empty Weight Alt 1500 kg
  max Takeoff Weight Main 5,200 lb
  max Takeoff Weight Alt 2360 kg
  engine (prop) Lycoming O-540 -C4B5
  number Of Props 2
  power Main 250 hp
  power Alt 186 kW
  max Speed Main 210 mph
  max Speed Alt 182 knots, 340 km/h
  range Main 1,200 miles
  range Alt 1042 nm, 1,900 km
  ceiling Main 20,000 ft
  ceiling Alt 6100 m
  climb Rate Main 1,500 ft/min
  climb Rate Alt 460 m/min
  loading Main 25 lb/ft&2
  loading Alt 120 kg/m&2
  power/mass Main 10 lb/hp
  power/mass Alt 338 kg/kW



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