Marsden Gemini

Gemini
Role Glider
National origin Canada
Designer Dr. David Marsden
First flight 1973
Status Production completed
Number built one


The Marsden Gemini is a Canadian mid-wing, T-tailed, two-seats in side-by-side configuration, experimental research glider that was designed and constructed by Dr. David Marsden at the University of Alberta, first flying in 1973.[1][2]

Design and development

The Gemini was designed to explore the use of flaps to create a variable geometry sailplane that would be optimized for both low speed thermalling flight and also high speed gliding between thermals.[1][2]

The aircraft was predominantly made from aluminium, with some stainless steel used for the wing ribs, controls and fittings. The two-place side-by-side cockpit was made from fibreglass. Its four-piece 60.75 ft (18.5 m) span high aspect ratio wing employed a modified Wortmann FX-61-163/35SF airfoil. The Fowler flaps occupied the entire trailing edge of the wing and accounted for 35% of the wing chord. In cruise the flaps were retracted, reducing the wing area. While climbing, the flaps were extended, producing a high lift coefficient of 2.2. For glidepath control when landing the flaps deployed to 80° to create aerodynamic drag. The outer flaps acted as slotted ailerons for roll control.[1][3]

Only one Gemini was built.[1][2] The aircraft is still operational and as of August 2011, owned by Gary Osoba of Wichita, Kansas, United States.[4]

Operational history

The aircraft was flown to set seven Canadian multi-place records, including the record for speed over a 500 km (311 mi) triangle. It was also used to set the US national record for the 300 km (186 mi) of 94 mph (151 km/h).[1][2]

On July 2, 2011, Osoba and his wife Christine flew the Gemini on a 565 mi (909 km) free distance flight from Zapata, Texas to just east of Amarillo, Texas, a flight which won the 2011 Barringer Trophy.[5][6]

Specifications (Gemini)

Data from Sailplane Directory[1]

General characteristics

Performance

See also

Other gliders with Fowler flaps


Related lists

References

  1. 1 2 3 4 5 6 Activate Media (2006). "Gemini Marsden". Retrieved 15 August 2011.
  2. 1 2 3 4 Armstrong, Ken (August 2011). "Capt. Ken's comments - July". Canadian Owners and Pilots Association. Retrieved 15 August 2011.
  3. ↑ Lednicer, David (2010). "The Incomplete Guide to Airfoil Usage". Retrieved 1 August 2011.
  4. ↑ "FAA Registry N Number Query Results - N77ZV". Retrieved 23 August 2011.
  5. ↑ "July 2 OLC". Retrieved 23 August 2011.
  6. ↑ "The Lewin B. Barringer Memorial Trophy". Retrieved 9 May 2012.
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