The O'Neill Model J Magnum, also called the Magnum Jake and the Magnum Pickup, is a

homebuilt Homebuilt machines are machines built outside of specialised workshops or factories. This can include different things such as kit cars or homebuilt computers, but normally it pertains to homebuilt aircraft, also known as amateur-built aircraft or ...

aircraft design for bush flying operations similar to the

de Havilland Beaver The de Havilland Canada DHC-2 Beaver is a single-engined high-wing propeller-driven short takeoff and landing (STOL) aircraft developed and manufactured by de Havilland Canada. It has been primarily operated as a bush plane and has been used ...

Design and development

O'Neill intended to modify the Aristocraft II six-place homebuilt with a

radial engine The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is ca ...

. Eventually a clean sheet design was drawn up based on a bush pilot survey in Alaska. The Magnum is a single-engine,

strut-braced In aeronautics, bracing comprises additional structural members which stiffen the functional airframe to give it rigidity and strength under load. Bracing may be applied both internally and externally, and may take the form of strut, which act in ...

high-wing A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple planes. A monoplane has inherently the highest efficiency and lowest drag of any wing confi ...

aircraft with an uncommon dual-main, four-wheel

landing gear Landing gear is the undercarriage of an aircraft or spacecraft that is used for takeoff or landing. For aircraft it is generally needed for both. It was also formerly called ''alighting gear'' by some manufacturers, such as the Glenn L. Martin ...

. The

fiberglass Fiberglass (American English) or fibreglass (Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass cloth ...

gear legs support castoring wheels in the front, allowing for conversion to floats and providing support when the tail section is swung open for cargo loading. The

fuselage The fuselage (; from the French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds crew, passengers, or cargo. In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraft t ...

is constructed from welded steel tubing, with

aluminum Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It has ...

skin. The engine cowl is sourced from a

Cessna UC-78 The Cessna AT-17 Bobcat or Cessna Crane is a twin-engine advanced trainer aircraft designed and made in the United States, and used during World War II to bridge the gap between single-engine trainers and larger multi-engine combat aircraft. The ...

. The wings have full-span flaps, and

spoileron In aeronautics, spoilerons (also known as spoiler ailerons or roll spoilers) are spoilers that can be used asymmetrically as flight control surfaces to provide roll control. Operation Spoilerons roll an aircraft by reducing the lift of the ...

s and are designed to fold like those of a Fairchild FB-2C. The fuel tank is mounted under the cockpit and can be released to reduce fire risk during emergency landings. Post flight-testing modifications resulted in changes to the landing gear layout, spoileron airflow control and engine cooling. The Magnum was demonstrated at the EAA Airshow in 1984. In 1996, O'Neill folded the O'Neill aircraft company due to low interest and funding for further development. The prototype was sold in 1996 for an intended turboprop conversion.

Variants

;Magnum ;Model J Magnum ;Magnum Jake ;Magnum Pickup ;Magnum V8 Pickup :The prototype was converted in 1986 from a radial engine to an automobile engine powered by a Ford 351W with a McCulloch VS57 supercharger from a snowmobile, producing at 4500rpm.

Design and development

Variants

Specifications (Model J Magnum perf estimated)

See also

References

External links