McCulloch J-2
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__NOTOC__ The McCulloch J-2 was a small, two-seat
autogyro An autogyro (from Greek and , "self-turning"), also known as a ''gyroplane'', is a type of rotorcraft that uses an unpowered rotor in free autorotation to develop lift. Forward thrust is provided independently, by an engine-driven propeller. Whi ...
with an enclosed cabin, one of only three designs of this type of aircraft to receive a
type certificate A type certificate signifies the airworthiness of a particular category of aircraft, according to its manufacturing design (''type design''). It confirms that the aircraft of a new type intended for serial production, is in compliance with applica ...
in the United States. It was built by McCulloch Aircraft Corporation.


Design and development

It was designed by
Drago Jovanovich Dragoljub Kosta Jovanovich (January 24, 1916 – November 12, 1983), also known under his pen name D. K. or "Gish" Jovanovich, was a Serbian-American helicopter designer, inventor, and pioneer in autogyro technology. Born in the Kingdom of Yugosla ...
and first flew in June 1962. McCulloch acquired the design in 1969 and put it into production, building 83 aircraft over the next three years. They were reported to sell for US$15,900. The design featured a belt clutch and a transmission which could be engaged to spin the rotor blades to high speed before take-off to produce short takeoff runs. A lever on the rear cockpit wall would select the drive position for the transmission. A single "spin-up lever" on the cockpit left side would then be pressed downward, operating as a collective pitch control to put the blades into flat pitch while simultaneously tensioning the belt clutch. The rotor could be spun to over 500 rpm before takeoff, well above the normal flight range (typically 425 rpm). Release of the spin-up lever would disengage both the clutch and the transmission, while placing the blades into flight pitch. After a very brief takeoff run (typically 25 to 200 feet, depending upon load and winds) adequate flight airspeed would be attained, while the rotor speed decayed to the normal flight range. The rotor was not engine-driven in flight. A strong spring resisted accidental depressing of the spin-up lever while airborne. Dual controls were provided for all functions except the spin-up lever, which was accessible only from the left seat. The aircraft enjoyed nimble handling with light control forces, but suffered from a shallow climb gradient. Early versions were equipped with a two-bladed wooden
Sensenich Sensenich Propeller, founded in 1932, is an American manufacturer of wood, metal and composite propellers for certified, homebuilt and ultralight aircraft, as well as airboats. The company headquarters is located in Lititz, Pennsylvania.Purdy ...
propeller. A later "Super J-2" variant employed a three-bladed Hartzell controllable-pitch propeller, accompanied by an increase in allowable gross weight. Baggage of up to 95 pounds, to the extent permitted by gross weight considerations, could be carried in a large bay under the seat. Fuel was carried in tanks in the stub wings. A total of 24 U.S. gallons could be carried, 12 on each side, but only 20 were usable through normal flight attitudes. At a typical fuel burn rate of about eight gallons per hour and economy cruise at about 85 mph, with a need for a safety reserve, this limited the aircraft's range. The rotor system (hub and blades) is very similar to that found on the early versions of the Hughes 269 / Schweizer 300 series helicopters. The primary difference is in the twist of the blades (or lack thereof), optimized for autorotation in the case of the J-2. Most examples of the J-2 were sold to pilot owners in the United States but at least one example was exported to the United Kingdom.UK Register of Civil Aircraft - register entry for G-AZWZ (pictured)
/ref> In
1974 Major events in 1974 include the aftermath of the 1973 oil crisis and the resignation of United States President Richard Nixon following the Watergate scandal. In the Middle East, the aftermath of the 1973 Yom Kippur War determined politics; f ...
, the rights were bought by Aero Resources, who planned to return the Super J-2 to production, but could not find a market for the aircraft and no more were built.


Variants

;Jovanovich Jov-2 :The initial prototype as designed by
Drago Jovanovich Dragoljub Kosta Jovanovich (January 24, 1916 – November 12, 1983), also known under his pen name D. K. or "Gish" Jovanovich, was a Serbian-American helicopter designer, inventor, and pioneer in autogyro technology. Born in the Kingdom of Yugosla ...
. ;McCulloch J-2 and Super J-2 :Production versions built by McCulloch from 1971 to 1974. 83 built. ;Aero Resources Super J-2 :Further planned production by Aero resources, powered by a
Lycoming O-360-A2D The Lycoming O-360 is a family of four-cylinder, direct-drive, horizontally opposed, air-cooled, piston aircraft engines. Engines in the O-360 series produce between 145 and 225 horsepower (109 to 168 kW), with the basic O-360 produc ...
. None built.


Specifications (Super J-2)


See also

*
Robert P. McCulloch Robert Paxton McCulloch (May 11, 1911 – February 25, 1977) was an American entrepreneur from Missouri, best known for McCulloch chainsaws and purchasing the "New" London Bridge (Lake Havasu City), London Bridge, which he moved to Lake Havasu Ci ...
*
Twin-boom aircraft A twin-boom aircraft is characterised by two longitudinal booms (extended nacelle-like bodies). The booms may contain ancillary items such as fuel tanks and/or provide a supporting structure for other items. Typically, twin tailbooms support ...


References

* * * * *
Aerofiles
* {{McCulloch aircraft http://www.gyroplane.co/gyro_article_2003.html 1960s United States civil utility aircraft Single-engined pusher autogyros Aircraft first flown in 1962 Twin-boom aircraft