Campbell Production

Single-seat autogyro based on the American Bensen B-8M, featuring a number of improvements. The fuselage is a cruciform all-metal steel-tube structure, replacing the square-section tubular 6061-T6 aluminium structure of the Bensen B-8M, with engine mounts of T45 tube, argon arc-welded, and featured a semi-enclosed glassfibre nacelle with a small windscreen. The tail unit, a fin and rudder only, is of Aerolam aluminium alloy sandwich construction, replacing the plywood unit of the Bensen, supported by single-spar tailboom. The rotor system features a two-blade auto-rotating main rotor, with all-metal blades of hollow section, replacing the laminated ply construction of the Bensen, with single steel spar, solid extruded leading-edge, bonded and flush-riveted, and attached to aluminium alloy hub by blocks and four bolts on each blade. A rotor brake fitted, with pre-spin device, which rotates the rotor to 200 rpm, is available optionally. Non-retractable tricycle type landing gear with small tailwheel or bumper, no shock-absorbers, with identical nylon wheels and Avon tyres and tubes, on each unit. A Campbell developed drum brake is fitted to the nose-wheel, which is steerable and self-centering, linked to the rudder control. One 72 h.p. modified Volkswagen 1.6 litre four-cylinder engine, with hot-air de-icing of carburettor and driving a Hordern Richmond fixed pitch propeller, replaces the 72 h.p. McCulloch Model 4318 flat-four two-stroke engine of the Bensen B-8M.

Deeper forward nacelle offering greater protection for the pilot, small horizontal tailplane with endplate fins. One 75 h.p 2000 cc Volkswagen powerplant.

Two seat fully enclosed cabin gyroplane fitted with a twin-boom tailplane. Production aircraft were to be fitted with either a 160 h.p. Lycoming O-320-B or 130 h.p. Rolls-Royce Continental O-240-A powerplant.

Curlew Specification (Published Estimates)
Rotor Dia	Length	Height	Rotor Disc Area	Empty Wt	Max AUW	Cruise Speed	Maximum Speed	Range	Service Ceiling
21 ft 10 in	12 ft 6 in		363 sq ft	550 lb	900 lb	70 mph/ 61 kn
6.65 m	3.81 m		33.72 m2	249 kg	408 kg	113 kph

Two seat semi-enclosed cabin gyrocopter, it was initially fitted temporarily with a single seat rather than the two seat, fully-enclosed carpeted and heated cabin. With no orders forthcoming, it was never fitted with the two-seat cockpit. One 130 h.p. Rolls-Royce Continental O-240-A powerplant.

Cougar Specification
Rotor Dia	Length	Height	Rotor Disc Area	Empty Wt	Max AUW	Cruise Speed	Maximum Speed	Range	Service Ceiling
27 ft 7 in	15 ft 4 in	8 ft 7 in	597.5 sq ft	650 lb	1000 lb	75 mph/ 65 kn	90 mph/ 78 kn	225 mi
8.41 m	4.67 m	2.62 m	55.51 m2	295 kg	454 kg	121 kph	145 kph	362 km

It is not known to which aircraft these designations were applied.

A plans-built version of the Cricket Mk.1, to meet engineering and test requirements set out in BCAR Section T. with plans available from British Gyroplanes. One 64 h.p. Rotax 582 powerplant driving an Arplast propeller.

As Cricket Mk. 4, equipped with a horizontal stabilizer designed in conformance with the formula derived by Juan de la Cierva.

A plans-built successor to the Mk. 4 and was intended to replace the Bensen B-8M that could no longer be built in the UK. It was an open framed machine with several improved features, amongst them main-wheel suspension.

The British Gyroplanes Ltd Four-Runner basically reversed the tradition Bensen-style gyrocopter configuration. It was a tractor-mode autogyro powered by a Rotax 503 engine mounted forward, driving a GSC Tech III three-bladed propeller, with Rotodyne two-bladed teetering rotor. The pilot now sat behind the rotor mast, forward of the tailplane, which featured a Cricket-style fin and rudder plus one further fin/rudder each side mounted at about 80% of the tailplane span and braced back the the main fin. Full tricycle undercarrige with no tail bumper.

Although loosly of the same configuration as the Cricket, the Sheffy is a completely new design. Compared to the Cricket, the fuselage nacelle is raised significantly compared to the powerplant, the fuselage tail boom being cranked down behind the cockpit to provide propeller clearance. The fin and rudder are similar to the Cricket, but a braced tailplane is now added. Tricycle type; fixed undercarriage, with new larger mainwheels mounted on downward sloping tube metal Vs, each with damped arm anchored to main engine support. Due to the nacelles height, the new damped, steerable nosewheel is taller than that of the Cricket.

As Cricket 6 with minor updates. The tailplane, fin and rudder are similar to the Lovegrove Sheffy, as is the main undercarriage, although the main supporting V-members are horizontal as the fuselage framework is the same as the Cricket. A new, streamlined, instrument pedestal is fitted. One 64 h.p. Rotax 582 DCDI two-cylinder, liquid-cooled two stroke powerplant driving a GSC Tech III three-blade, ground-adjustable pitch, wooden propeller.