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Yuneec International EViva
The Yuneec EViva was originally designed by Martin Wezel in conjunction with the Czech company Composit and initially intended to be powered by a 50 hp (37 kW) Rotax 503 two-stroke or 60 hp (45 kW) HKS 700E four-stroke powerplant.
The aircraft was designed to comply with the Fédération Aéronautique Internationale microlight rules. It features a cantilever wing, a T-tail, a two-seats-in-side-by-side configuration enclosed cockpit under a bubble canopy, retractable monowheel gear with wing tip and tail casters, and a single electric motor in tractor configuration driving a folding propeller.
The design was purchased by Yuneec, development shifted to China and the aircraft was adapted for electric power.
The aircraft is made from composites. Its 17 m (55.8 ft) span wing has an area of 14.2 m2 (153 sq ft) and upper wing telescopic air brakes as well as flaps. The wing is derived from the Wezel Apis 2 wing. The standard engine fitted is the 40 kW (54 hp) Yuneec Power Drive 40 electric motor, controlled by a Yuneec Power Block 40 400 Amp power controller and powered by two Kokam Lithium polymer battery packs of 31 Ampere-hours (Ah) each (62 Ah total). The engine weighs 23 kg (51 lb), the controller 7 kg (15 lb) and the batteries weigh 67 kg (148 lb) in total. The propeller folds aft into the engine cooling vents when not in use and deploys automatically on engine start. The batteries are charged by a Yuneec E-Charger that can run on 110-240 volts and charge in 3–4 hours.
First flown in 2012, the projected price in 2011 was €91,000.
Powerplant: 1 × Yuneec Power Drive 40 electric motor, 40 kW (54 hp)
Battery packs: two Kokam Lithium polymer packs of 31 Ah each (62 Ah total)
Propeller: 2-bladed folding carbon fibre
Prop diameter: 1.60 m (5 ft 3 in)
Wingspan: 17 m (55 ft 9 in) / 11.6 m with wing tips removed
Wing area: 14.2 m2 (153 sq ft)
Length: 6.9 m (22 ft 8 in)
Height: 2.65 m (8 ft 8 in)
Empty weight: 225 kg (496 lb)
Gross weight: 472.5 kg (1,042 lb)
Maximum speed: 180 km/h (112 mph; 97 kn)
Cruise speed: 160 km/h (99 mph; 86 kn)
Stall speed: 65 km/h (40 mph; 35 kn) flaps down
Never exceed speed: 230 km/h (143 mph; 124 kn)
Endurance: 1.3 hours on batteries
Maximum glide ratio: 38:1
Rate of sink: 0.65 m/s (128 ft/min) at 85 km/h (53 mph)
Wing loading: 33.3 kg/m2 (6.8 lb/sq ft)
Crew: one
Capacity: one passenger
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