The Sirius is a light single-seater motorglider, designed by Claude Noin. The first prototype flew in August 1984. It used a tube, wood and fabric structure and a 11 m wing ; serial types have a composite fuselage and a longer wing. The design, focused on economy and performance at low speeds, features a high wing, a fixed engine and propeller and a fixed gear, with conventional control system.

Design features : "pod and boom" design, with pusher engine. Aimed at meeting French ultralight category certification requirements.

Flying controls : pitch control by elevator, including a trim tab. Rudder actuated by cables. Ailerons for roll control. DSF Spoilers / Airbrakes on upper surface wing. Standard control system (stick and pedals).

Structure : fuselage molded in two halves of fibreglass/epoxy, with plywood bulkheads. Lexan/polycarbonate canopy. Fabric-covered rudder. Composites wing structure with wooden main spar and glass fibre/epoxy stiffened Styrofoam ribs. Leading edge made of hot wire cut foam laminated with glass fibre and epoxy resin. Wing covered with heat-shrink fabric.

Landing gear : fixed. Main wheel at CG location. Nose wheel. Small wheels under the tail and under each wing tip. Drum brake.

Power plant : One JPX-D-320 (18 hp) or one Koenig 3-cylinders (24 hp) engine, driving a fixed 2-blade propeller . Fuel capacity 19 litres

Accomodation : One pilot, beneath a one-piece removable canopy. No bagage shelf.


Dimensions, areas and weights (Sirius C) :

Wing span : 13.4 m
Length overall : 5.90 m
Wing area : 14.30 m2
Weight empty :

142 kg

Max T-O weight : 270 kg

Performance at maximum take-off weight (Sirius C, JPX engine) :

Max speed : 130 km/h)
Stalling speed :

48 km/h

Max rate of climb : 2 m/s (394 ft/mn)
Best glide ratio :


Min rate of sink :

0.90 m/s

G limits (operational) + 4.4 / -2.2 G

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