Donated by Peter Smith in 2015.
The prototype of this model was the first high performance sailplane built by Schweizer Aircraft Corporation and was the first production sailplane in the world to have water-ballast tanks.
The prototype flown by Dick Comey won the 1947 National Soaring
Contest. The 1-21 set many records. Only two were built.
Total Number Built: 2
Span: 51 ft 15.54 m
Length: 21.9 ft 6.68 m
Wing Area: 165 ft2 15.3 m2
Empty weight 470 lbs 214 kg
Maximum Flying Weight: 992 lbs 450kg
Wing Loading: 4.4 lbs/ft2 1.7 kg/m2 (Unballasted)
Maximum Wing Loading: 6.0 lbs/ft2 29.4 kg/m2 (Ballasted)
Glide Ratio: 27:1 @ 45 mph 72 km/h
Minimum rate of sink: 2:2 ft/sec @ 38 mph 0.66 m/sec @ 61 km/h