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  Aircraft History, Specification and Information
Murphy JDM-8
C-IBFZ - 2003 Murphy JDM-8 Murphy
2003 Murphy JDM-8 - C-IBFZ (sn J001)
Murphy Aircraft Mfg. Ltd.
Photo taken Aug. 18, 2005
Chilliwack, BC - Canada (YCW / CYCW)
Photo © Marcel Siegenthaler

The Murphy JDM-8 is a Canadian single-seat ultralight monoplane designed by Daryl Murphy. The type was intended to be sold as a kit for home construction by Murphy Aircraft of Chilliwack, British Columbia.

The designation indicates the designer's initials, J. Daryl Murphy and his eighth design.

Design and development

Work was begun on the JDM-8 design in December 1998, but the project was not a high priority and so did not fly until March 2001. The aircraft was first publicly shown at Sun 'n Fun 2000 when it was not yet complete.

The JDM-8 is an all-metal low-wing cantilever monoplane designed in two variants, one to meet the American FAR 103 Ultralight Vehicles regulations and one for the non-American markets particularly Canada and Europe. The JDM-8 has a conventional landing gear with a tailwheel and can be powered by a Rotax engine from 20-80HP. An unusual feature is the upwards folding wing for storage and transportation.

The fuselage of the JDM-8 is of semi-monocoque aluminum construction. The 5 US gal (19 l) fuel tank is located in front of the instrument panel. The conventional main landing gear for the ultralight version is bungee suspended and includes brakes, while the main landing gear of the homebuilt version is of a sprung design. The tail wheel spring is of 4140 steel and incorporates an inline skate wheel.

The JDM-8 wing is constructed with an aluminum D-cell leading edge incorporating a 9 in (23 cm) high C-channel main spar made from 6061-T6 grade aluminum. The rear spar is a similar C-channel that is 5 in (12.7 cm) high and there is a third nose spar that is 3 in (7.6 cm) in height. The wing aft of the D-cell is covered in aircraft fabric and has a modified NACA 4415 airfoil with a drooped trailing edge. The 11 nose ribs and nine aft wing ribs are made from hydroformed aluminum. The ailerons were adapted from the Murphy Rebel design and are 69 in (175 cm) long with a 15 in (38 cm) chord. The ultralight version has a 4 ft (122 cm) greater wingspan to lower its stall speed to below the US ultralight category limit of 28 mph (45 km/h). With the wings folded the homebuilt version is 8.75 ft (267 cm) high and the ultralight version with its longer wings is 10.9 ft (332 cm) high.

The horizontal tailplane is 95 in (241 cm) in span to allow legal road transportation on a trailer as most jurisdictions limit trailers to 96 in (244 cm). The ultralight version has an ultimate load limit of +5/-2.7 g and an operational limit of +3.8/-1.8g, while the homebuilt version has an ultimate limit of +5.7/-5.7g and an operational limit of +3.8/-3.8 g.

The kit supplied for the JDM-8 was intended to include the parts to make both versions and the manufacturer claimed a construction time from the kit of 800 hours.

The completed prototype JDM-8 was displayed at Sun 'n Fun in April 2004, but due to the introduction in the US of the light-sport aircraft category at the same time, no orders were forthcoming and by 2008 the aircraft was no longer listed as being available by Patterson AeroSales, the manufacturer's sole sales agent.

Operational history

In January 2011 there were two JDM-8s registered in Canada, one a basic ultralight and the other an advanced ultralight, both owned by the manufacturer.

Variants

  • US ultralight version
    Single seat, low-wing monoplane with 24 ft (7.3 m) wingspan, powered by a 28 hp (21 kW) Rotax 277 or other engine of 25 to 30 hp (19 to 22 kW) for the US ultralight category.
  • Homebuilt version
    Single seat, low-wing monoplane with 20 ft (6.1 m) wingspan, powered by engines up to 80 hp (60 kW), including the powered by a 60 hp (45 kW) HKS 700E for the Canadian basic ultralight, advanced ultralight or amateur-built categories.

Specifications (FAR-103 Variant)

General characteristics
Crew: 1
Wingspan: 24 ft 0 in (7.32 m) homebuilt version has a 20 foot wingspan
Wing area: 120 sq ft (11 m2)
Airfoil: modified NACA 4415
Empty weight: 254 lb (115 kg)
Gross weight: 500 lb (227 kg)
Fuel capacity: 5 US gallons (19 litres)
Powerplant: 1 × Rotax 277 single cylinder two-stroke piston engine, 28 hp (21 kW)
Propellers: 2-bladed GSC wooden, 5 ft 0 in (1.52 m) diameter

Performance
Maximum speed: 63 mph (101 km/h; 55 kn)
Cruise speed: 55 mph (48 kn; 89 km/h)
Stall speed: 26 mph (23 kn; 42 km/h)
G limits: +3.8/-1.8
Rate of climb: 800 ft/min (4.1 m/s)

Last updated May 14, 2012
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Murphy JDM-8".
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