Specifications - SonexAus

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 |