SGS 1-23 Schweizer   

General Details
Manufacturer: Schweizer
Plane Name:

SGS 1-23

Classified as: Unclassified
Country Of Origin: U S A
Designer: Ernest Schweizer
No. of Seats 1
No. Built 74
L/DMax: 29 80 kph / 43 kt / 50 mph
MinSink: 0.67 m/s / 2.2 fps / 1.30 kt


Span Area Empty Weight Payload Gross Weight Wing Load Water Ballast
m ft sq.m sq.ft kg lb. kg lb. kg lb. kg
kg lb.
15 49.2 14.81 159.4 213 470 127 280 340 750 22.96 4.7 0 0
Aspect ratio: 15.12
Airfoil: NACA 43012A
Structure: all metal

The ‘standard’ 1-23 introduced in 1948, and with its later versions, the B, C, D, E,F,G,H was for years America’s most numerous performance sailplane. The 1-23B & C were built for the 1952 World Championships held at Madrid – Cuatro Vientos, Spain flown by Paul MacCready and Paul Schweizer. They both had the wing spars spliced and stretched to 15.24 m./ 50 ft., and the C had thicker wing skins, a heavier spar and weighed 41 kg./ 90 lb more. In 1953 the 1-23D (ATC) was introduced, a production version of the B. One flown by Paul MacCready won the 1953 Nationals, and another was flown 733 km./ 455.5 miles by Joe Lincoln to earn the Barringer Trophy for 1960. An example belongs to the National Soaring Museum. The single increased span (16.1 m./ 52.8 ft.) 1-23E was built for Paul MacCready to fly in the 1954 World Championships where it finished 4th. It has balanced air brakes and originally did not a wheel, using the skid for takeoff and landing. Paul Bikle won two world altitude records with the 1-23E (14.102 m./ 46.267 ft. absolute 12.894 m./ 42.303 ft. gain). One F was built, being an E with heavier butted skins on the wing. The 1-23G (ATC) was a 1954 production model with the longer wing of the E and F, standard spoilers and a larger vertical tail of slightly different shape. To the basic 1- 23G model Schweizer added balanced airbrakes, removable wingtips and other minor modifications to produce the H model, of which 8 were built. The more numerous H-15 version has a wingspan reduced to 15.0 m./ 49.2 ft. qualifying it for the FAI-OSTIC Standard Class. It was also produced with removable tips increasing the span to 16.1 m./ 52.8 ft. 39 of this model were built. One, which also belongs to the National Soaring Museum, was substantially modified by Sterling Starr by the fitting of a new NACA 65 (3)-618 section 16.5 m./ 54 ft. wing.


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