Ross R-3 Ibis
After the RS-1, Ross was commissioned by the Soaring Society of America to design and build the RS-3 Ibis for promotion purposes. The R-2 was quite similar to the RS-1 but the gull wing had a 48 ft. span and an all-moving tail was used. Ross later altered the design to remove the gull wing, change the airfoil and simplify the all wood construction for homebuilders, designating it the R-3.
Marvin Hicks bought a set of plans and built a modified R-3 (RH-3) by extending the wing, using laminar airfoil and flaps, first flying in 1963.
The Vintage Sailplane Association has plans.
Wing span: 15.24 m / 50 ft
Wing area: 13.56 sq.m / 146 sq.ft
Aspect ratio: 17
Airfoil: NACA 63 (3)-618
Empty Weight: 218 kg / 480 lb
Payload: 107 kg / 235 lb
Gross Weight: 325 kg / 715 lb
Wing Loading: 23.97 kg/sq.m / 4.9 lb/sq.ft
Water Ballast: 0
MinSink: 0.64 m/s / 2.1 fps / 1.24 kt
L/DMax: 34 93 kph / 50 kt / 58 mph