O'Neill Magnum
| {{Infobox Aircraft Begin
| name=Magnum | image= | caption= }}{{Infobox Aircraft Type | type=Homebuilt aircraft | national origin=United States | manufacturer=O'Neill Airplane Company | designer=Terrence O'Neill | first flight= | introduced= | retired= | status= | primary user= | more users= | produced= | number built= | program cost= | unit cost= | developed from=O'Neill Aristocraft II | variants with their own articles= }} |
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.{{cite book|title=Jane's all the world's aircraft|author=Frederick Thomas Jane|year=1987}}
Design and development
O'Neill intended to modify the Aristocraft II six-place homebuilt with a {{convert|350|hp|kW|0|abbr=on}} radial engine. Eventually a clean sheet design was drawn up based on a bush pilot survey in Alaska.{{cite journal|journal=Sport Aviation|date=March 1984|title=Magnum, Amateur built, Beaver-Type|page=12}}
The Magnum is a single-engine, strut-braced, high-wing aircraft with an uncommon dual-main, four-wheel landing gear. The fiberglass 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 is constructed from welded steel tubing, with aluminum skin. The engine cowl is sourced from a Cessna UC-78. The wings have full-span flaps, and spoilerons 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.{{cite journal|journal=Sport Aviation|date=July 1996|page=14}}
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 {{convert|380|hp|kW|0|abbr=on}} at 4500rpm.{{cite journal|journal=Contact!|date=October 1993|page=13}}
Specifications (Model J Magnum perf estimated)
{{Aircraft specs
|ref=Jane's All the World's Aircraft 1984-85{{cite book |title=Jane's All the World's Aircraft 1984-85 |url=https://archive.org/details/janesallworldsai8485john |url-access=registration |editor1-last=Taylor |editor1-first=John W.R. |edition=75th |year=1984 |publisher=Jane's Publishing Co. |location=London |isbn=0-7106-0801-2 |page=465}}
|prime units?=kts
|crew=1
|capacity=7 pax
|length ft=24
|length in=0
|length note=
|span ft=30
|span in=3
|span note=
|width ft=9
|width note=folded
|height ft=9
|height in=7
|height note=
|wing area sqft=159.3
|wing area note=
|aspect ratio=5.7
|airfoil=NACA 4415
|empty weight lb=2050
|empty weight note=
|gross weight lb=
|gross weight note=
|max takeoff weight lb=3800
|max takeoff weight note=MTOW and MLW
|fuel capacity={{cvt|56|USgal|impgal l|0}} tank under forward fuselage with optional {{cvt|90|USgal|impgal l|0}} auxiliary tank
|more general=
|eng1 number=1
|eng1 name=Jacobs R-755S
|eng1 type=7-cylinder air-cooled turbocharged radial engine
|eng1 hp=350
|prop blade number=3
|prop name=Hartzell B3P20
|prop dia m=
|prop dia ft=
|prop dia in=89
|prop dia note= constant-speed metal propeller with spinner
|max speed kts=
|max speed note=
|cruise speed kts=122
|cruise speed note=at sea level
::::{{cvt|174|kn|mph km/h|0}} at {{cvt|18000|ft|0}}
|stall speed kmh=
|stall speed mph=
|stall speed kts=60
|stall speed note=
|never exceed speed kts=161
|never exceed speed note=with flaps extended
|range nmi=347
|range note=with maximum standard fuel, 45 minutes reserve
|ferry range nmi=608
|ferry range note=with optional {{cvt|90|USgal|impgal l|0}} auxiliary tank, 45 minutes reserve
|endurance=
|ceiling m=
|ceiling ft=
|ceiling note=
|g limits=
|roll rate=
|glide ratio=
|climb rate ms=
|climb rate ftmin=
|climb rate note=
|time to altitude=
|lift to drag=
|wing loading lb/sqft=23.85
|wing loading note=
|power/mass={{cvt|0.092|hp/lb}}
|more performance=
- Minimum Ground turning radius: {{cvt|14|ft|0}}
}}
See also
References
{{reflist}}
External links
- [http://vs57.y-block.info/pin_ups.htm Site with a description of the V-8 engine installation]