Murphy JDM-8
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| Murphy JDM-8 | |
|---|---|
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| JDM-8 advanced ultralight prototype powered by an HKS 700E, with one wing folded | |
| Role | Single-seat homebuilt UltralightTemplate:Short description |
| National origin | Canada |
| Manufacturer | Murphy Aircraft |
| Designer | Daryl Murphy |
| First flight | March 2001[1] |
| Status | Prototypes only |
| Number built | 2 |
The Murphy JDM-8 is a Canadian single-seat ultralight monoplane designed by Darryl Murphy. The type was intended to be sold as a kit for home construction by Murphy Aircraft of Chilliwack, British Columbia.[1][2]
The designation indicates the designer's initials, J. Darryl Murphy and his eighth design.[1]
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.[1]
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.[2] The JDM-8 has a conventional landing gear with a tailwheel and can be powered by a Rotax engine from 20-80HP.[2] An unusual feature is the upwards folding wing for storage and transportation.[1][2]
The fuselage of the JDM-8 is of semi-monocoque aluminum construction. The Script error: No such module "convert". 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.[1]
The JDM-8 wing is constructed with an aluminum D-cell leading edge incorporating a Script error: No such module "convert". high C-channel main spar made from 6061-T6 grade aluminum. The rear spar is a similar C-channel that is Script error: No such module "convert". high and there is a third nose spar that is Script error: No such module "convert". 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 Script error: No such module "convert". long with a Script error: No such module "convert". chord. The ultralight version has a Script error: No such module "convert". greater wingspan to lower its stall speed to below the US ultralight category limit of Script error: No such module "convert".. With the wings folded the homebuilt version is Script error: No such module "convert". high and the ultralight version with its longer wings is Script error: No such module "convert". high.[1]
The horizontal tailplane is Script error: No such module "convert". in span to allow legal road transportation on a trailer as most jurisdictions limit trailers to Script error: No such module "convert".. 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.[1]
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.[3]
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.[4]
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.[5]
Variants
- US ultralight version
- Single seat, low-wing monoplane with Script error: No such module "convert". wingspan, powered by a Script error: No such module "convert". Rotax 277 or other engine of Script error: No such module "convert". for the US ultralight category[1]
- Homebuilt version
- Single seat, low-wing monoplane with Script error: No such module "convert". wingspan, powered by engines up to Script error: No such module "convert"., including the powered by a Script error: No such module "convert". HKS 700E for the Canadian basic ultralight, advanced ultralight or amateur-built categories[1][6]
Specifications (FAR-103 Variant)
Data from World Directory of Leisure Aviation,[2] Levy[1] and Kitplanes[3]
General characteristics
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- Airfoil: modified NACA 4415Template:Aircraft specs/convertTemplate:Aircraft specs/convertTemplate:Aircraft specs/convert
- Fuel capacity: 5 US gallons (19 litres)Template:Aircraft specs/convertTemplate:Aircraft specs/engTemplate:Aircraft specs/engTemplate:Aircraft specs/engTemplate:Aircraft specs/lengthTemplate:Aircraft specs/convert
- Propellers: 2-bladed GSC woodenTemplate:Aircraft specs/length
PerformanceTemplate:Aircraft specs/speedTemplate:Aircraft specs/speedTemplate:Aircraft specs/speedTemplate:Aircraft specs/speedTemplate:Aircraft specs/speedTemplate:Aircraft specs/rangeTemplate:Aircraft specs/rangeTemplate:Aircraft specs/rangeTemplate:Aircraft specs/convert
- g limits: +3.8/-1.8Template:Aircraft specs/convertTemplate:Aircraft specs/convertTemplate:Aircraft specs/convertTemplate:Aircraft specs/convertTemplate:Aircraft specs/convertScript error: No such module "Check for unknown parameters".
See also
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References
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- Notes
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- ↑ a b c d e f g h i j k Levy, Howard: Daryl Murphy's Latest, Kitplanes, Volume 20, Number 1, January 2003, pages 10-12. Primedia Publications. ISSN 0891-1851
- ↑ a b c d e Script error: No such module "Citation/CS1".
- ↑ a b Downey, Julia: 2002 Kit Aircraft Directory, Kitplanes, Volume 18, Number 12, December 2001, page 55. Kitplanes Acquisition Company. ISSN 0891-1851
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