Length | 5.39 m |
Wing span | 6.7 m |
Wing area | 9.1 sq m. |
Aerofoil | 64-415 |
Primary structure | 6061-T6 aluminium |
Cockpit width | 102 cm at shoulders 97 cm at hips |
Stall — 25° flaps (Vso) | 35 knots |
Stall — clean (Vs1) | 40 knots |
Max flap extended speed (Vfe) | 87 knots |
Manoeuvring speed (Va) | 118 knots |
Never exceed speed (Vne) | 170 knots |
Engine | 80 hp 2180 VW | 80 hp Jabiru | 120 hp Jabiru |
Empty weight | 249 kg | 249 kg | 259 kg. |
Fuel capacity | 60 litres | 60 litres | 60 litres |
Range at 75% power msl | 412 nm | 412 nm | 369 nm |
Max speed — msl | 130 knots | 130 knots | 148 knots |
Cruise speed at 75% msl | 113 knots | 113 knots | 130 knots |
Cruise speed at 75% 8000 ft | 130 knots | 130 knots | 148 knots |
Power loading (MTOW/hp) | 13.125 lbs | 13.125 lbs | 9.167 lbs |
Take-off ground roll | 300 ft | 300 ft | 200 ft |
Landing distance | 500 ft | 500 ft | 500 ft |
Design MTOW | 476 kg | 476 kg | 499 kg |
Baggage (max) | 18 kg | 18 kg | 18 kg |
Rate of climb | 800—1000 fpm | 800—1000 fpm | 1200—1400 fpm |
Design load factor | +4.4 /—2.2 g | +4.4 /—2.2 g | +4.4 /—2.2 g |
CG forward limits | 20 % wing chord | 20 % wing chord | 20 % wing chord |
CG aft limits | 32 % wing chord | 32 % wing chord | 32 % wing chord |
Sonex flight Performance
Flight figures given with full load of fuel (33 kg), one pilot and one passenger (152 kg) for the tri-gear with 2200 Jabiru engine. These flight figures reflect a 4—6 knot loss in cruise speed from the standard gear model. More performance information is available on the Sonex web site.
Climb | 69 knot climb-out speed for 568 ft/min |
Cruise | 3200 ft at 3000 rpm = 102 knots |
Cruise | 3200 ft at 3200 rpm = 115 knots |
Stall (clean) | 42 knots (indicated airspeed at 3000 ft) |
Stall (15° flap) | 38 knots (indicated airspeed at 3000ft) |
The next page in Lynn Jarvis’s Sonex project details building the Sonex.
Lynn Jarvis’s Sonex project
| 1. Introduction | 2. Sonex specifications | 3. Building the Sonex |
| 4. The tail and spar | 5. The wing | 6. The aft fuselage | 7. More on the fuselage |
| 8. It all comes together | 9. The canopy | 10. The engine | 11. Electrical | 12. The cowling |
| 13. Paint and polish | 14. Moving | 15. Finishing | 16. First flight | 17. Natfly 2004 |