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The Marsden Gemini is a Canadian mid-wing, , two-seats in side-by-side configuration, experimental research glider that was designed and constructed by David Marsden at the University of Alberta, first flying in 1973.
The aircraft was predominantly made from aluminium, with some stainless steel used for the , controls and fittings. The two-place side-by-side cockpit was made from fibreglass. Its four-piece 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 for roll control.
The aircraft was flown to set seven Canadian multi-place records, including the record for speed over a triangle. It was also used to set the US national record for the of .
On July 2, 2011, Osoba and his wife Christine flew the Gemini on a free distance flight from Zapata, Texas to just east of Amarillo, Texas, a flight which won the 2011 Barringer Trophy.
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