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Ling-Temco-Vought L450F

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Message par ag_or_not Sam 06 Avr 2013, 10:06

L'unique avion d'observation discrète Ling-Temco-Vought L450F vu sur Wikipedia.en

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The LTV L450F, also known as the L45ØF, was a prototype quiet reconnaissance aircraft, developed by Ling-Temco-Vought in the late 1960s for use in the Vietnam War by the United States.

Based on the airframe of a Schweizer 2-32 sailplane, the aircraft flew in 1970, and was developed into the XQM-93 reconnaissance drone before the project was cancelled.

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Message par ag_or_not Sam 06 Avr 2013, 10:07

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Message par ag_or_not Sam 06 Avr 2013, 10:58

Design and development

Developed as a follow on to the Igloo White program, the L450F was intended to provide a quiet reconnaissance and communications relay aircraft.

Under a $1 million USD contract by LTV Electrosystems, the L450F was developed from a Schweizer SGS 2-32 sailplane, modified by Schweizer to LTV's specifications.

These modifications included stronger wing spars, thicker wing skin, installation of a Pratt & Whitney PT6A turboprop engine driving a three-bladed propeller, and main landing gear based on that of the Grumman Ag-Cat agricultural aircraft.

An alternative configuration, using a piston engine, was also proposed.

The prototype L450F first flew in February 1970, but was destroyed during its third flight, on 23 March that year, the pilot successfully bailing out.

A second prototype was then completed and flown, successfully completing the testing program, and a third prototype was ordered as the unmanned XQM-93 drone, under the Compass Dwell project.

Four examples of the XQM-93 were contracted for by the United States Air Force, however the Compass Dwell project was subsequently cancelled.
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Message par ag_or_not Sam 06 Avr 2013, 10:58

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Message par ag_or_not Sam 06 Avr 2013, 10:59

Operational history

March 27, 1972 Donald R. Wilson reached the altitude of 15 456 m (50 708 ft) in horizontal flight on board of the L450F registered N2450F, setting a new Fédération Aéronautique Internationale international record, Class C-1c, Group II (Powered aeroplanes, take off weight 1000 to 1750 kg, turboprop).

This record was still valid as of March 27, 2012.
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Message par ag_or_not Sam 06 Avr 2013, 11:00

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Message par ag_or_not Sam 06 Avr 2013, 11:01

Specifications (prototype)

Data from Janes

General characteristics

Crew: 1 (pilot)

Length: 29 ft (8.8 m)

Wingspan: 57 ft (17 m)

Empty weight: 2,400 lb (1,089 kg)

Max takeoff weight: 4,600 lb (2,087 kg)

Fuel capacity: 2,300 pounds (1,000 kg)

Powerplant: 1 × Pratt & Whitney PT6A-29 , 778 shp (580 kW)

Propellers: 3-bladed Hartzell
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Message par ag_or_not Sam 06 Avr 2013, 11:03

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Message par ag_or_not Sam 06 Avr 2013, 11:03

Performance


Cruising speed: 105 mph; 169 km/h (91 kn)

Range: 5,996 mi; 9,649 km (5,210 nmi)

Endurance: 24-30 hours

Service ceiling: 52,000 ft (15,850 m)

Maximum glide ratio: 28:1

Rate of climb: 2,600 ft/min (13 m/s)
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Message par ag_or_not Sam 06 Avr 2013, 11:05

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Message par ag_or_not Sam 06 Avr 2013, 11:06

Bibliography


Taylor, John W.R. (ed.) Jane's All The World's Aircraft 1971-1972. London: Sampson Low Marston & Co, 1971. ISBN 0 354-000-942.

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Message par ag_or_not Sam 06 Avr 2013, 11:07

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