Tweed GT-1

GT-1
	The GT-1 with the later canopy fitted
Role	Glider
National origin	United States
Designer	George Tweed Jr
First flight	1960
Status	Production completed
Number built	One

The Tweed GT-1 is an American high-wing, FAI Open Class single seat glider that was designed by George Tweed Jr.^[1]

Design and development

First full assembly of the GT-1 in the backyard of the house in La Mesa, California, where it was built in the garage over several years in the late 1950s. The GT-1 has the early bubble canopy in this photo.

The GT-1 was built in concert with the Whigham GW-1 as both builders shared ideas and tools. The GT-1 first flew in 1960.^[1]

The lower part of the GT-1's nose was constructed from a drop tank, with the upper part fabricated from fiberglass that was laid up using the drop tank as a mold. The landing gear is a retractable monowheel. The aircraft was initially fitted with a bubble canopy. Later, the fuselage was modified to allow a more reclined pilot seating position and the canopy replaced with a more streamlined one. The modifications added 200 lb (91 kg) to the glider's empty weight and the gross weight was raised 100 lb (45 kg) in partial compensation. The GT-1's 51 ft (15.5 m) span wing employs a NACA 43012A airfoil. The initial glide ratio was 29:1, but extensive work gap-filling and contouring the aircraft raised this to 33:1.^[1]

Only one GT-1 was built and the aircraft was registered in the Experimental - Amateur-Built category.^[1]^[2]

Operational history

George C. Tweed Jr. with Jack Green and the GT-1 after the first flight at Elsinore, California. The early-style bubble canopy be seen on the ground.

The GT-1 was entered in the 1960 US Nationals, but, as the designer termed it, the aircraft "proved to be a victim of technical obsolescence" and it did not place well. Both the designer and Jack Green did however complete their gold badges in the glider.^[1]

By 2011 the aircraft had had its Federal Aviation Administration registry revoked and the aircraft likely no longer exists.^[2]

Specifications (GT-1 later configuration)

GT-1 cockpit while the aircraft was under construction.

Data from Soaring^[1]

General characteristics

Crew: One
Wingspan: 51 ft 0 in (15.54 m)
Wing area: 155 sq ft (14.4 m²)
Aspect ratio: 17:1
Airfoil: NACA 43012A
Empty weight: 683 lb (310 kg)
Gross weight: 853 lb (387 kg)

Performance

Maximum glide ratio: 33:1 at 55 mph (89 km/h)
Rate of sink: 120 ft/min (0.61 m/s) at 45 mph (72 km/h)
Wing loading: 5.5 lb/sq ft (27 kg/m²)

References

^ ^a ^b ^c ^d ^e ^f Said, Bob: 1983 Sailplane Directory, Soaring Magazine, page 66, Soaring Society of America November 1983. USPS 499-920
^ ^a ^b Federal Aviation Administration (July 2011). "Make / Model Inquiry Results N7830C". Retrieved July 4, 2011.

External links

[SoaringNov83-1] ^ ^a ^b ^c ^d ^e ^f Said, Bob: 1983 Sailplane Directory, Soaring Magazine, page 66, Soaring Society of America November 1983. USPS 499-920

[FAAReg-2] Federal Aviation Administration (July 2011). "Make / Model Inquiry Results N7830C". Retrieved July 4, 2011.

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