Engineering:Ellison-Mahon Gweduck
| Gweduck | |
|---|---|
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| Role | 4-passenger amphibious aircraft |
| National origin | United States |
| Manufacturer | Ellison-Mahon Aircraft |
| Designer | Ben Ellison, Bryan Mahon |
| First flight | 2 May 2009 |
| Number built | 1 |
The Ellison-Mahon Gweduck or Geoduck is an American twin-engine amphibious aircraft, built from composites to resemble the Grumman Widgeon.
Design and development
The Gweduck is a re-engined "re-creation" in modern composite materials of the early 1940s Grumman G-44 Widgeon. The name can also be written Geoduck and is not named for a bird, but a large clam. Although it is broadly similar to the Widgeon and follows its cantilever high-wing monoplane, twin engined, cruciform tail and tailwheel undercarriage layout, it has more powerful engines, retractable floats, more cabin windows and is larger all around.[1][2][3]
The Gweduck's structure is formed from glass and carbon fibre. Its high wings are trapezoidal in plan, fitted with externally balanced ailerons and Fowler flaps. Each wing has a float mounted below it on a single, wide chord strut which rotates through 90° after take-off to place the float at the wing tip. A pair of 300 hp (220 kW) Lycoming IO-540 six cylinder horizontally opposed engines are mounted forward of the wing leading edge with their thrust lines above the upper surface. The Gweduck has a single step hull, with the pilots' cabin just forward of the wing leading edge; behind them, the passenger cabin has four windows on each side. Tail surfaces are straight edged, the tailplane trapezoidal and the fin leading edge swept, with a horn balanced rudder and externally mass balanced elevators. On land the Gweduck uses a conventional undercarriage, with mainwheels that retract but remain exposed in the fuselage sides and a tailwheel that retracts behind doors in the extreme rear fuselage.[1]
The first flight was on 2 May 2009 from Lake Washington. By June 2010, 200 flying hours had been logged.[4]
Operational history
By April 2017, one example, the prototype, had been registered in the United States with the Federal Aviation Administration.[5]
Specifications
Data from Jane's All the World's Aircraft 2010/12[1]
General characteristics
- Crew: Two pilots
- Capacity: 4 passengers
- Length: 34 ft 5 in (10.49 m)
- Wingspan: 48 ft 0 in (14.63 m) floats down
- Height: 10 ft 6 in (3.20 m) propellers "Y"
- Wing area: 295.0 sq ft (27.41 m2)
- Aspect ratio: 7.8
- Airfoil: GA35U-A315
- Empty weight: 4,200 lb (1,905 kg) prototype
- Max takeoff weight: 5,999 lb (2,721 kg)
- Fuel capacity: 167 Imp gal (200 US gal; 758 L)
- Powerplant: 2 × Lycoming IO-540-M1B5 flat-six piston, 300 hp (220 kW) each
- Propellers: 3-bladed MT-propeller MTV-9-B-C-F-R(M)/CFR213-59
Performance
- Cruise speed: 160 mph (250 km/h, 130 kn) at 65% power at 915 m (3000 ft)
- Wing loading: 20.3 lb/sq ft (99.3 kg/m2) maximum
- Power/mass: 164 W/kg (0.10 hp/lb)
References
- ↑ 1.0 1.1 1.2 Jackson, Paul (2011). Jane's All the World's Aircraft 2011-12. Coulsdon, Surrey: IHS Jane's. pp. 735–6. ISBN 978-0-7106-2955-5.
- ↑ Simpson, Rod (2001). Airlife's World Aircraft. Shrewsbury: Airlife Publishing Ltd. p. 262. ISBN 1-84037-115-3.
- ↑ Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, page 110. Flying Pages Europe SARL, 2015. ISSN 1368-485X
- ↑ "Project news". http://gweduc.netfirms.com/gweduck.com/projectnews.shtml.
- ↑ Federal Aviation Administration (5 April 2017). "Make / Model Inquiry Results". http://registry.faa.gov/aircraftinquiry/AcftRef_Results.aspx?Mfrtxt=&Modeltxt=GWEDUCK&PageNo=1.
External links
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