The Lycoming O-540 is a family of air-cooled six-cylinder , horizontally opposed fixed-wing aircraft and helicopter engines of 541.5 cubic inches (8,874 cc) displacement, manufactured by Lycoming Engines . The engine is a six-cylinder version of the four-cylinder Lycoming O-360 .
25-543: 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
50-472: A "second throttle", the turbochargers are controlled using a manual wastegate assembly that places an additional handle labeled "boost" next to the throttle handle in the cockpit, effectively creating a secondary throttle. The TC model is certified for flight to 25,000 ft (7,600 m), with an advertised turbo critical altitude of 20,000 ft (6,100 m), giving a maximum true airspeed of 223 mph (194 kn; 359 km/h). In 1967, one aircraft
75-474: A distance of 6,967 mi (6,054 nmi; 11,212 km), in 56 hours 26 minutes. He set a closed-circuit distance record in the same aircraft on July 4–6 November 1960, flying 6,921 mi (6,014 nmi; 11,138 km). On 14 May 1962, Kenneth Walker arrived in Brisbane, Australia , in a PA-24-250 on a delivery flight from San Francisco . Walker's flight was the first ever solo single-engine crossing of
100-686: A distance of 7,668 mi (12,340 km). When the aircraft took off from Casablanca, it was heavily overloaded and just cleared the airport fence. The Comanche 250 Max Conrad flew for this flight is now located in the museum at the Liberal, Kansas , airport. On November 24–26, 1959, Conrad flew a Comanche 180 on a distance record flight in FAI C1-C Class for aircraft taking off at weights from 2,204 lb (1,000 kg) to less than 3,858 lb (1,750 kg) that still stands: Casablanca to El Paso, Texas , 6,966 mi (11,211 km) nonstop,
125-533: A steel tube truss frame around the passenger compartment with monocoque behind. The British ARV Super2 light aircraft has a fuselage constructed mainly of aluminium alloy, but with some fibreglass elements. The cockpit is a stiff monocoque of "Supral" alloy, but aft of the cockpit bulkhead, the ARV is conventionally built, with frames, longerons and stressed skin forming a semi-monocoque. Peter Williams ' 1973 Formula 750 TT -winning John Player Norton racer
150-457: A stressed shell structure that is similar to a true monocoque , but which derives at least some of its strength from conventional reinforcement. Semi-monocoque construction is used for, among other things, aircraft fuselages, car bodies and motorcycle frames. Semi-monocoque aircraft fuselages differ from true monocoque construction through being reinforced with longitudinal stringers. The Mooney range of four seat aircraft, for instance, use
175-443: A top cruise speed of 160 kn (180 mph; 300 km/h). Most 250s had carbureted Lycoming O-540-AIA5 engines, but a small number were fitted out with fuel-injected versions of the same engine. Early Comanche 250s had manually operated flaps and carried 60 US gal (230 L) of fuel. Auxiliary fuel tanks (90 US gal (340 L) total) became available in 1961. Electrically actuated flaps were made standard with
200-402: The 1972 Lock Haven flood . Two prototypes were built in 1956, with the first being completed by June 20, 1956. The first production aircraft, powered by a 180 hp (134 kW) Lycoming O-360-A1A engine, first flew on October 21, 1957. In 1958, it was joined by a higher-powered PA-24-250 with a 250 hp (186 kW) Lycoming O-540-A1A5 engine; this model was originally to be known as
225-635: The great Susquehanna River flood of 1972 , flooding the manufacturing plant and destroying airframes, parts, and much of the tooling necessary for production. Rather than rebuild the tooling, Piper chose to abandon production of the Comanche and Twin Comanche and continue with two newer designs already in production at Piper's other plant in Vero Beach, Florida - the PA-28R-200 Arrow and the twin-engined PA-34 Seneca . The original version of
250-423: The 1962 model year. Four 260-horsepower (194 kW) versions of the Comanche were introduced beginning in 1965. They were: A total of 1,029 airplanes were sold from the Comanche 260 line, including the 260TC. The 260 had an empty weight around 1,700 lb (770 kg) and a maximum gross weight of 2,900 lb (1,300 kg). It had four seats, and a 90-US-gallon (340 L)-capacity auxiliary fuel system
275-470: The 400 is structurally strengthened, primarily in the tail, with an extra nose rib in the stabilator and the vertical fin. The stabilator, vertical fin, and rudder of the 400 share virtually no common parts with the 180, 250, or 260 hp (190 kW) Comanches. In 1967, a single Comanche was modified by Swearingen with a pressurized cabin. The prototype, powered by a 260 hp (190 kW) Lycoming O-540 engine and equipped with Twin Comanche landing gear,
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#1732791875317300-777: The Comanche was the PA-24, which featured a carbureted 180 hp (134 kW) Lycoming O-360-A1A engine, swept tail, laminar flow airfoil, and all-flying stabilator . The standard fuel capacity of the PA-24-180 was 60 US gallons (230 L). The flaps were manually actuated, controlled by the same Johnson bar actuator as the Piper Cherokee . The aircraft specifications were for cruise speeds of 116 to 139 knots (215 to 257 km/h) and fuel burns between 7.5 and 10.5 gallons per hour (28 and 40 L/h) at 55 and 75% power settings, respectively. Full-fuel payload with standard fuel
325-491: The Comanches except the 400. Often mistaken on the ramp for the 400 model, the slightly longer cowling includes a distinctively longer nose gear door, as compared to the B models and older versions. Starting in 1970, Piper offered a turbo-normalized variant of the PA-24-260 known as the 260TC with a Lycoming IO-540-R1A5 engine and dual Rajay turbochargers. Twenty-six were produced between 1970 and 1972. Advertised by Piper as
350-617: The PA-26, but Piper decided to keep the PA-24 designation. In 1964, the 400 hp (298 kW) PA-24-400 was introduced. The following year, the PA-24-250 was superseded by the PA-24-260, featuring the Lycoming IO-540D or E engine of 260 hp (194 kW). A turbocharged version using a Rajay turbocharger was introduced in 1970. Production of the Comanche ended in 1972, when torrential rains from Hurricane Agnes caused
375-837: The Pacific, and the third solo crossing from the US to Australia. From Brisbane, Walker continued south to deliver the Comanche to the Royal Newcastle Aero Club at Maitland, New South Wales , Australia. In July 1964, Henry Ohye, flying a 1961 PA-24-250, made the first successful trans-Pacific flight from the United States to Japan in a single-engined aircraft. He flew from Los Angeles to Tokyo with stops in Honolulu , Midway , Wake , Guam , and Okinawa . A 1966 Comanche 260B, named Myth Too and registered as G-ATOY,
400-512: The entire baggage area and seat smaller adults, placarded to a total weight of 250 lb (110 kg). Typical empty weight was 1,728 lb (784 kg) and gross weight was 3,100 lb (1,400 kg). Fuel burn was 11 to 14 gal/h (42 to 53 L/h) and advertised speed was 140–160 kn (260–300 km/h; 160–180 mph). The 260C introduced a new "Tiger Shark" cowling, maximum gross weight of 3,200 lb (1,500 kg), cowl flaps, and an aileron-rudder interconnect. Cruise speed
425-488: Was 715 lb (324 kg), with a gross weight of 2,550 lb (1,160 kg) and range with 45-minute reserve of 700 nmi (1,300 km; 810 mi). When new, standard, typically equipped Comanche 180s sold between $ 17,850 (1958) and $ 21,580 (1964). A total of 1,143 were built. In 1958, Piper introduced a 250 hp (190 kW) version using a Lycoming O-540 engine, giving the PA-24-250 Comanche
450-423: Was advertised as 150–161 kn (278–298 km/h; 173–185 mph) with fuel flow of 12.5 to 14.1 gal/h (47 to 53 L/h). To prevent possible aft center-of-gravity problems due to the increased gross weight and its fifth and sixth seats, the propeller shaft was extended. This moved the center of gravity slightly forward. With a useful load of 1,427 lb (647 kg), it has the largest payload of all of
475-535: Was advertised as 16 to 23 gal/h (61 to 87 L/h), at 55-75% power. The high fuel burn means that it is expensive to operate. The 400 had a typical empty weight of 2,110 lb (960 kg) and a maximum gross weight of 3,600 lb (1,600 kg). Book speeds for the PA-24-400 included a cruising speed of 185 kn (343 km/h; 213 mph) and a top speed of 194 kn (359 km/h; 223 mph). While identical in planform to other PA-24 models,
500-469: Was an early example of a semi-monocoque motorcycle. Lycoming O-540 Producing between 230 and 350 horsepower (170 and 260 kW) these engines are installed in a large variety of aircraft. The main competitors are the Continental IO-520 and IO-550 series. An AEIO version was developed for high-performance competition aerobatics aircraft. Starting at 260 hp (190 kW)
525-414: Was available as an option. Cruise speed was advertised as 142–161 kn (263–298 km/h; 163–185 mph) with fuel burn of 10 to 14 gal/h (38 to 53 L/h). The 260B had an overall length 6 in (150 mm) more than the previous models due to a longer propeller spinner, not a longer fuselage. The 260B had a third side window and a provision for six seats. The fifth and sixth seats take up
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#1732791875317550-720: Was designated the PA-33. First flown on March 11, 1967, the prototype later crashed on takeoff in May 1967 and the project was cancelled. In June 1959, Max Conrad flew a Comanche 250 on a record-breaking distance flight in Fédération Aéronautique Internationale C1-D Class, for aircraft from 3,858 lb (1,750 kg) to less than 6,614 lb (3,000 kg). Having removed the interior seats and replaced them with fuel tanks, Conrad flew nonstop from Casablanca , Morocco , to Los Angeles ,
575-416: Was modified with a 300 hp (224 kW) Lycoming engine for trials. It did not enter production. Two prototype aircraft were built in 1961. They were standard Comanche airframes, but had 380 hp (283 kW) Lycoming IO-720-A1A engines with a three-bladed propeller. The design was modified with an even larger 400 hp (298 kW) engine and produced as the PA-24-400. The PA-24-400 Comanche 400
600-605: Was owned by English aviator Sheila Scott . The aircraft, flown by Scott, holds 90 world-class light aviation records. It is on public display at the National Museum of Flight , Scotland. The circumnavigation by the oldest pilot on record in 1994 was made by Fred Lasby at age 82 in a Comanche 260B. Data from Jane's All the World's Aircraft 1971–72 General characteristics Performance Semimonocoque The term semi-monocoque or semimonocoque refers to
625-467: Was produced from 1964 to 1966. Only 148 PA-24-400s were built. The Comanche 400 is powered by the 400 hp (298 kW), horizontally opposed , eight-cylinder Lycoming IO-720 engine, developed specifically for the model. Cooling problems have happened with the rear cylinders. The Comanche 400 has a three-bladed propeller and carries 100 US gal (380 L) of fuel, or 130 US gal (490 L) with optional extended tanks. Fuel burn
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