Coelho AC-11

The Coelho AC-11 (also called the AC.11 and AC 11) is a Brazilian homebuilt aircraft that was designed and produced by Altair Coelho of Eldorado do Sul and introduced in 1994. The aircraft was intended to be supplied as a kit for amateur construction, but only one was completed.

Design and development
The aircraft features a V-strut-braced low-wing, a two-seats-in-side-by-side configuration enclosed cockpit, fixed tricycle landing gear or optionally conventional landing gear and a single engine in tractor configuration.

The aircraft fuselage is made from welded steel tube, while the wing is plywood, with some surfaces covered in doped aircraft fabric and some covered in plywood. Its 8.08 m span wing has a wing area of 13.7 m2 and employs a NACA 4412 airfoil. The cabin width is 108 cm. The acceptable power range is 70 to 105 hp and the engine used for the prototype was a 2000 cc 105 hp Volkswagen air-cooled engine with a steel-pulley and polyurethane chain-driven 2:1 reduction drive.

The aircraft has a typical empty weight of 290 kg and a gross weight of 520 kg, giving a useful load of 230 kg. With full fuel of 76 L the payload for pilot, passenger and baggage is 109 kg.

The standard day, sea level, no wind, take off with a 105 hp engine is 140 m and the landing roll is 200 m.

The manufacturer estimated the construction time of the prototype as 1600 hours.

Operational history
By 1998 the company reported that one conventional gear version of the aircraft was completed and flying, while a tricycle gear version was under construction.