Designed by Thomas W. Scanlan, the SG-1A was designed and built in 1970 as an inexpensive, easy-to-build ship with gentle flight characteristics. No special jigs or tools are required other than a welding rig and common hand tools. The boom-and pod design, which has been static load tested to 9g without failure, features a strut-braced aluminum wing with upper- surface spoilers, a fixed wheel and a nose skid. While the prototype had constant chord, V-strutted wings; the A version has double-tapered wings with single struts. Structure: all-aluminum (spars, ribs and skin) wing; steel-tube, fabric-covered fuselage and tail.
Wing span: 12.19m / 40ft
Wing area: 11.61sq.m / 125sq.ft
Empty Weight: 136kg / 300lb
Payload: 113kg / 250lb
Gross Weight: 249kg / 550lb
Wing Load: 21.44kg /sq.m / 4.4lb/sq.ft
Aspect ratio: 15.4
Airfoil: Go 549 mod.
L/DMax: 20 @ 89 kph / 48 kt / 55 mph
MinSink: 0.91 m/s / 3.0 fps / 1.78 kt