The O'Neill Model J Magnum, also called the Magnum Jake and the Magnum Pickup, is a homebuilt aircraft design for bush flying operations similar to the de Havilland Beaver.

Design and development

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

radial engine The radial engine is a reciprocating engine, reciprocating type internal combustion engine, internal combustion engine configuration in which the cylinder (engine), cylinders "radiate" outward from a central crankcase like the spokes of a wheel. ...

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

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 wings. A monoplane has inherently the highest efficiency and lowest drag of any wing config ...

aircraft with an uncommon dual-main, four-wheel

landing gear Landing gear is the undercarriage of an aircraft or spacecraft that is used for taxiing, takeoff or landing. For aircraft, it is generally needed for all three of these. It was also formerly called ''alighting gear'' by some manufacturers, s ...

. The

fiberglass Fiberglass (American English) or fibreglass (English in the Commonwealth of Nations, Commonwealth English) is a common type of fibre-reinforced plastic, fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened i ...

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 language, French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds Aircrew, crew, passengers, or cargo. In single-engine aircraft, it will usually contain an Aircraft engine, engine as wel ...

is constructed from welded steel tubing, with

aluminum Aluminium (or aluminum in North American English) is a chemical element; it has chemical symbol, symbol Al and atomic number 13. It has a density lower than that of other common metals, about one-third that of steel. Aluminium has ...

skin. The engine cowl is sourced from a Cessna UC-78. The wings have full-span flaps, and

spoileron In aeronautics, spoilerons (also known as spoiler ailerons or roll spoilers) are spoiler (aeronautics), spoilers that can be used asymmetrically as flight control surfaces to provide roll control. Operation Spoilerons flight dynamics (fixed-win ...

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