Sunbird Mk1 Design Specifications
Please Note that the Mark 1 is due to be further upgraded to the Mark 2. Full details of this new version will be announced later this year.
The Sunbird (Mark 1) has been upgraded since the launch a few years ago. The current design MTOW is 270kg. The empty weight, with Aixro XF40, is slightly under 120kg. The Payload is an amazing 150kg, thanks to its lightweight yet strong composite construction. Maximum pilot weight is 105kg.
It has a 25 litre nosetank together with two additional 12 litre wing tanks. That gives this aircraft great endurance/range. There is under-seat stowage amounting to 20 litres volume /10kg in weight, with a further 5kg behind the seat.
The controls are all pushrod with the exception of the rudder (cables), and the nosewheel is also steerable (push right = turn right).
Wing Span: 6.5m. Wing Area: 7.9 sqm, Length: 4.75m. Cockpit Width: 0.62m. Weight with Aixro XF40 engine, 120 kg. Weight with Hirth F23, around 129kg (payload 141kg).
Design Stress:- +4g/-2g Limit loads (+6g/-3g Ultimate)
Stall Speed (flaps):- under 35 knots.
Cruise Speed (35hp - 50hp):- Depends on engine and prop. Please Contact Us.
Design Vne: 114 knots. Dive speed Vd: 127 knots
Potential Endurance (4 Stroke Aixro XF40): Up to 7 hours
Potential engines and props (25kg to 36kg approx): -
4 Strokes:- Aixro XF40 rotary (our preferred standard engine). This engine, which is installed in the prototype, is water cooled. We have fitted two radiators, one either side of the engine (optional small cockpit radiator as extra). The engine comes with a 2.5 to 1 belt reduction unit as standard and develops 35hp at 6500prm (limited to max 7000rpm). There is an option for a 3.0 to 1 belt drive. Lubrication is by 2 stoke oil mix in unleaded fuel at 50 to 1. Fuel burn is 6 to 8 litres/ hour.
2 Strokes:- Hirth F23. This engine should fit with a modified cowl.