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Laister-Kauffmann LK-10A / Lawrence Tech Sailplane / TG-4



In 1938 Jack Laister completed a gull-wing sailplane, which was referred to as the Lawrence Tech Sailplane after its sponsor. Repainted red, white and blue and renamed the ‘Yankee Doodle’ it competed in a 1939 aerobatic competition at the Paris airshow.
Yankee Doodle
With the need for military trainers on the outbreak of World War II, Laister designed the two-place Yankee Doodle 2 from the original that utilized some of the features and technology from the LT-IV but transitioned to a dual cockpit and straight wing arrangement.
Lawrence Tech
A flat-top Version with increased performance also has an ATC. A ‘bunnynose’ LK, flown by Harold Hutchinson, held the national multiplace goal record of 399 km/ 248 miles from 1956 to 1967.
The Vintage Sailplane Association has copies of the military manuals, color scheme drawings and paint chips available.
One LK-10A belongs to the National Soaring Museum.
Laister-Kauffman TG-4A


Wing Span: 14.173 m
Wing Area: 12.5 sq m
Structure Weight: 124.7 kg
Flying Weight: 214.3 kg
Wing Loading: 17.14 kg/sq m
Root Chord: 137.2 cm
Tip Chord: 50.8 cm
Aspect Ratio: 16
Fuselage Length: 5.867 m
Stabilizer Span: 269.2 cm
Wing span: 15.2m /50ft
Wing area: 13.33sq.m / 165sq.ft
Empty Weight: 215kg / 475lb
Payload: 181kg / 400lb
Gross Weight: 396kg / 875lb
Wing Load: 29.7kg/sq.m / 5.27lb/sq.ft
L/DMax: 22 89 kph / 45 kt / 55 mph
MinSink: 0.98 m/s / 3.2 fps / 1.90 kt
Aspect ratio: 15.1
Airfoil: NACA 4418, 4409
Seats: 2
No. Built: 156
Lawrence Tech IV

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