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The Manuel Hawk

A retro glider built for the 1970's

W.L. "Bill" Manuel, who had designed and built four types of gliders starting as early as 1929 and which later culminated in the Willow Wren of 1932, designed and built the Hawk glider as a project for his retirement. The Hawk was to be a single-seat sailplane in all wood construction with a cantilever shoulder wing and designed especially for soaring in weak thermal conditions. In January, 1968, he retired from the position of Chief Planning Engineer with A .C. Cars Ltd., and having already previously designed the Hawk, built it at Fairoaks Aerodrome, Surrey between1968-1969. It was first flown at the College of Aeronautics at Cranfield on 25 November 1972, piloted by Howard Torode of the Cranfield Institute.

The single wheeled fuselage had a conventional serni-monocoque structure with plywood-covered spruce. The unusual canopy was arranged in three pieces: the front and rear sections being fixed one-piece single curves, whilst the middle section was a double curve mounted on a hinged frame. The fin, which supported the T-tail and tailplane were also plywood covered, with fabric covering the moving surfaces of the rudder and elevator . The elevator was fitted with a Flettner-type trim tab on its starboard edge.

The conventional wing was built in 3 sections with the outer wing panels being the removable. It consisted of a spruce spar at 33% chord with plywood leading edge torsion box and fabric covering rear of the main spar. The centre section of the three piece wing was of constant chord and fitted with parallel-ruler type, upper surface airbrakes positioned at 28.26% of the half-span and at 42% chord. The outer panels were tapered with rounded tips and carried the ailerons. The wing had an angle of incidence of 3° and the outer panels had 3° of dihedral


Photo above taken on the 8th May 1973
Colour Photos of the Hawk are courtesy of Michael Higginbottom
and were

The aircraft is beautifully finished with a high polish on the natural wood and clear dope on the fabric which gave the general appearance of a classic glider from years earlier. Attention to detail had been absolute and even the aileron linkages were shrouded. All the metal parts not requiring welding were made from stainless steel.


Photo above taken on the 11th Nov. 1971


Photos above taken on the 26th Nov. 1972, the day after the maiden flight.



The first flight was on 25 November 1972 and was towed by a Beagle A.61 Tugmaster 2, registration G-ASBU and piloted by Derek Wicox. Tests showed a lack of rudder power, but after some modifications, including increased rudder area, removal of the airbrakes from the lower wing surfaces and an alteration to the aileron controls, the aircraft finally prooved itself.

In 2013 the Hawk was donated to the Gliding Heritage Museum at Lasham where it will undergo restoration. The Museum have written a very interesting article on the glider which can be found here



Photo above taken on the day of the maiden flight - 25th Nov. 1972

Only one Hawk was ever built. It was certified as BGA 1778 in February 1973 and was entered in the annual 1973 PFA rally held at Sywell where it gained third place in a competition for best home-built aircraft.

DATA
Wing span 42ft 0 in 12.8 m
Length 22 ft 1.5 in 6.74 m
Wing area 149 sq ft 13.84 m2
Wing section
Wortmann FX61 - 163 centre-section,
FX61 - 185 at wing tip
Aspect ratio 11.88
Empty weight 406 1b 184 kg
Max weight 639 lb 290 kg
Max wing loading 4.29 1b/sq ft 20.95 kg/m2
Max speed 78.5 kt 146 km/h
Stalling speed 31 kt 57.5 km/ h)
Min sinking speed 2.53 ft/sec @ 33 kt 0. 77 m @ 61 km/ h
Max rough air speed 64 kt 118.5 km / h
Best glide ratio 25 @ 36 kt 25 @ 66.5 km/h
Undercarriage
Fixed Main wheel plus tail skid

Photos above taken on the 26th Nov. 1972, the day after the maiden flight.

Credits:

All Colour photographs courtesy of Michael Higginbottom
Wikipedia
British Gliders and Sailplanes by Norman Ellison
Aeromodeller Aug. 1970