Rockwell_685 Knowpia

Aero Commander 685 / ; Rockwell 685
	Rockwell Commander 685
Role	Business aircraft
National origin	United States
Manufacturer	Aero Commander/Rockwell International
First flight	1971
Developed from	Rockwell Commander 690

The Rockwell Commander 685 or Aero Commander 685^[1] is a light-twin piston-engined aircraft with a pressurized cabin originally built by the Aero Commander company, a division of Rockwell International from 1965.

The predecessor model was the Aero Commander 690 and the next generation are Aero Commander JetProp series. The Aero Commander 685 had the ICAO aircraft code AC6L^[2] The introduction was in 1971 and the retired in 1976; in this time are built 66 aircraft.^{[citation needed]}

Design and development edit

The Commander 685 was a piston-engined variant of the turboprop-powered Rockwell Commander 690, with two wing-mounted 435 hp Continental GTSIO-520K piston engines in tractor configuration with three-bladed Hartzell feathering propellers. It is a high-wing cantilever monoplane with an enclosed nine-seat cabin and a retractable nose-wheel landing gear. The Model 685 was type certified by the Federal Aviation Administration on 17 September 1971.

Specifications edit

Data from Jane's All the Worlds Aircraft 1976–77^[3]

General characteristics

Crew: 1–2
Capacity: 7–8 passengers
Length: 42 ft 11+3⁄4 in (13.10 m)
Wingspan: 46 ft 6.6 in (14.19 m)
Height: 14 ft 11+1⁄2 in (4.56 m)
Wing area: 266 sq ft (24.7 m²)
Empty weight: 6,021 lb (2,731 kg)
Max takeoff weight: 9,000 lb (4,082 kg)
Fuel capacity: 256 US gal (213 imp gal; 970 L) standard, 322 US gal (268 imp gal; 1,220 L) with auxiliary tanks
Powerplant: 2 × Continental GTSIO-520-F air-cooled flat-six, 435 hp (324 kW) each
Propellers: 3-bladed Hartzell, 7 ft 4 in (2.24 m) diameter

Performance

Maximum speed: 279 mph (449 km/h, 242 kn) at 20,000 ft (6,100 m) (TAS)
Cruise speed: 255 mph (411 km/h, 222 kn) at 24,000 ft (7,300 m), (max cruise) (TAS)
Stall speed: 86 mph (139 km/h, 75 kn) (wheels and flaps down), (CAS)
Range: 1,920 mi (3,090 km, 1,670 nmi) (econ cruise at 20,000 ft (6,100 m), no reserves)
Service ceiling: 27,500 ft (8,400 m)
Rate of climb: 1,490 ft/min (7.6 m/s)

References edit

^ Collins, Richard L. (January 1973). "On Top: Aero Commander 685". Flying. Vol. 92, no. 1. pp. 100–101. ISSN 0015-4806.
^ Anderson, Lionel K. (2010). ICAO Aircraft Codes (ACARS - A Users Guide for the Aviation Enthusiast ed.). Las Antalayas Publishing. p. 115. ISBN 978-1-4457-8847-0.
^ Taylor 1976, pp. 377–378