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Monnet Monerai

Monnet Monerai P


John Monnett became interested in gliding and pro­duced a single‑seat average‑performance glider called the Monerai which had a 28/1 glide angle at 60 mph (97 kph) and a sink of 160 ft/min (0.8 m/s) and was available as a kit. The Monerai prototype flew for the first time in February 1978 with Monnett at the controls. This was later designated the Monerai S (for sailplane) after the development of the motor glider Monerai P (for powered) version.
Monnet Monerai S


The Monerai follows the precedents set by Sonerai I and II, by offering simplified construction and economy with high performance. Designed for the first-time builder or the expert, the Monerai can be either a true sailplane for the purist or, with the addition of a pod-mounted engine (Monerai P), a self-launching sailplane for those who wish to operate independent of tow planes. A chrome-moly tubing primary fuselage structure combines with a molded fuselage shell and extruded aluminum tail boom to make up a lightweight, ultrasmooth exterior with integral structural integrity for pilot safety. The tubular aluminium tailboom is bolted to the pod. The preformed canopy, molded ABS components, sewn seat sling and simplified control-system components are offered to make construction easier. The pilot is accommodated in a reclining sling-type seat, and headrest and rudder pedals are adjustable. The control stick is mounted on the right of the cockpit. On the left a lever operates the trailing-edge flaps, which travel from —8° to +90°. The optional engine is designed to be removed easily so that the ship can be used as a pure sailplane at the pilot’s whim. The wing uses a single-piece skin bonded to an extruded main spar and completely formed pressed ribs.
Each wing panel weighs only 23.6 kg (52 lb), making rigging easy. Like the wing, the V-tail has pressed aluminium ribs. The all-moving tailplane has its port panel slightly forward of the starboard panel; the two are identical and interchangeable.


Single-seat single-engined mid-wing monoplane with conventional three-axis control. Wing has unswept leading and trailing edges, and constant chord; V-tail. Pitch/yaw control by elevon; roll control by full-span ailerons; control inputs through stick for pitch/roll and pedals for yaw. Cantilever wing; wing profile; double-surface. Undercarriage has two wheels in tandem; no suspension on either wheel. No ground steering. Brake on main wheel. Aluminium-tube/glass-fibre totally enclosed. Engine mounted above wing driving pusher propeller.

Neither the latter's characteristics (max-imum and minimum weights and wing load-ing), nor its performance figures (maximum and minimum speeds straight and level) allow the classification of this machine as an ultralight or microlight. The Monerai P is sold as a kit for $3950 in 1983, with no precise figure for completion time, or as plans for $200. The standard motor offered is the single cylinder Zenoah G25B of 20 hp, but since the summer of 1982, this can be replaced by a twin-cylinder KFM 107 engine delivering 25hp at 7300rpm. A standard Monerai feature is full-span flaps (except for the ailerons) designed for negative (up) settings for high-speed flight and positive (down) settings for thermalling, with 90 deg down for landing. Also notable is the single-pin tail-surface attachment, adjustable controls and seating, and the inclusion of a wheel brake on the flap handle. A side stick is fitted with a bungee trim system, and there is provision for oxygen and radio.

The Monerai Max wingtip extension kit was conceived to add more than three feet to the span, bringing it to 12 meters, and raising the L/D to more than 30:1. It uses flaps, which can be lowered to 90 degree, for approach control.


Monerai S
Wing span: 11.0 m (36 ft 0 in)
Length: 6.0 m (19 ft 7 in)
Height: 89 cm (35 in)
Wing area: 7.25 sq.m (78 sq ft)
Wing section: Wortmann FX-61192 mod
Aspect ratio: 16.6
Empty weight: 99.8 kg (220 lb)
Max weight: 204.12 kg (450 lb)
Water ballast: None
Max wing loading: 28.12 kg/sq.m (5.76 lb/sq ft)
Max speed: 104 kt (193 km/h)
Stalling speed: 33 kt (61 km/h)
Min sinking speed: 0.85 m (2.8 ft)/sec at 48 kt (89 km/h)
Max rough air speed: 78 kt (145 km/h)
Best glide ratio: 28 at 52 kt (97 km/h)


Monerai P
Engine: Zenoah G25B, 20 hp at 6500 rpm
Belt reduction
Power per unit area 0.26 hp/sq.ft, 2.8 hp/sq.m
Fuel capacity 1.0 US gal, 0.8 Imp gal, 3.8 litre
Length overall 19.7 ft, 5.96 m
Height overall 4.3ft, 1.32m
Wing span 36.0ft, 10.97m
Constant chord 2.2 ft, 0.66 m
Sweepback 0 deg
Total wing area 78 sq.ft, 7.2 sq.m
Wing aspect ratio 16.6/1
Empty weight 270 lb, 122 kg
Max take-off weight 500 lb, 227kg
Payload 230 lb, 104 kg
Max wing loading 6.41 lb/sq.ft, 31.2 kg/sq.m
Max power loading 25.0 lb/hp, 11.33kg/hp
Load factors; +5.2, -5.2 ultimate
Max level speed 90mph, 145kph
Never exceed speed 120mph, 193kph
Max cruising speed 60mph, 97kph
Stalling speed 40mph, 64 kph
Max climb rate at sea level 300 ft/min, 1.5m/s
Min sink rate 160ft/min at 55mph, 0.8 m/s at 88 kph
Best glide ratio with power off 22/1 at 60mph, 97kph
Take-off distance 500 ft, 150 m

Monerai P
Engine: Zenoah/KFM 107
Wing span: 10.97m / 36ft
Wing area: 7.25sq.m / 78sq.ft
Aspect ratio: 16.6
Empty Weight: 100kg / 220lb
Payload: 104kg / 230lb
Gross Weight: 204kg / 450lb
Wing Load: 28.14kg/sq.m / 5.76lb/sq.ft
L/DMax: 28 97 kph / 52 kt / 60 mph
MinSink: 0.85 m/s / 2.8 fps / 1.66 kt
Airfoil: Wortmann Fx 61192 mod


Monnet Monerai S





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