IO-720 | |
---|---|
Type | Piston aero-engine |
National origin | United States |
Manufacturer | Lycoming Engines |
First run | 1961 |
Major applications | PAC Fletcher Piper Comanche 400 Helio Courier |
Produced | 1961–present |
Developed from | Lycoming O-360 |
The Lycoming IO-720 engine is a large displacement, horizontally opposed, eight-cylinder aircraft engine featuring four cylinders per side, manufactured by Lycoming Engines. [1]
There is no carbureted version of the engine, which would have been designated O-720 and therefore the base model is the IO-720. The IO-720 and the Jabiru 5100 are the only flat-eight configuration aircraft engines currently in production. [2]
The engine has a fuel injection system which schedules fuel flow proportionally to the airflow, with fuel vaporization occurring at the intake ports. The engine has a displacement of 722 cubic inches (11.8 litres) and produces 400 hp (298 kW). The cylinders have air-cooled heads cast from aluminum alloy with a fully machined combustion chamber. [1] [3]
The first IO-720 was type certified on 25 October 1961 to the CAR 13 standard as amended to 15 June 1956 including 13-1, 13-2, 13-3, 13-4. [2]
In 2009 a new IO-720-A1B cost US$113,621, with a rebuilt engine retailing for US$75,435 and a factory overhaul priced at US$66,289. [4]
Data from Lycoming Specialty Datasheet [3] and TYPE CERTIFICATE DATA SHEET NO. 1E15, Revision 6 [2]
The Piper PA-24 Comanche is an American single-engine, low-wing, all-metal monoplane of semimonocoque construction with tricycle retractable landing gear and four or six seats. The Comanche was designed and built by Piper Aircraft and first flew on May 24, 1956. Together with the PA-30 and PA-39 Twin Comanches, it made up the core of Piper's lineup until 1972, when the production lines for both aircraft were destroyed in the 1972 Lock Haven flood.
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The Northwest Ranger was a Canadian bush aircraft that was under development by Northwest Industries (NWI) of Edmonton, Alberta between 1968 and 1972. The aircraft was a type certified design, and intended to be supplied as a complete ready-to-fly-aircraft.
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