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Tandem Aircraft Sunny Airkraft Sunny
 Sunny Sport
The Sunny is a tube and fabric design ultralight aircraft that was designed by Dieter Schulz. The aircraft complies with the Fédération Aéronautique Internationale microlight category rules. It features an unusual diamond-shaped biplane, strut-braced closed wing layout, a two-seats-in-tandem enclosed or open cockpit, fixed tricycle landing gear and a single engine in pusher configuration. The upper wing is swept back, while the lower wing is straight, but mounted further aft. The two wings are joined by swept tip rudders. The elevons are mounted to the lower wing only.
The aircraft is made from bolted-together aluminum tubing, with its flying surfaces covered in Dacron sailcloth.
Standard engines available include many models of Hirth, Rotax, BMW and Verner 133M powerplants, ranging from 65 to 80 hp (48 to 60 kW). 
A side by side trainer, production of the Sunny Sport UL-biplane was started by Dieter Schulzs company, Tandem Aircraft KG of Saulgau, Germany, in 1989. In the first year 25 Sunnies were sold, however the sale figures of the Sunny went down over the years. About 150 examples between 1989 and 1999. Finally in 1999 Tandem Aircraft KG became bankrupt.
Alexander Dewald bought the rights in 1999 and it was then produced by Dewald Leichtflugzeugbau Gmbh of Bad Schönborn, Germany and more recently by Airkraft Gmbh Leichtflugzeugbau of Beringen, Switzerland, who seem to have gone out of business in about 2011 and production ended after 250 were built.
Originally supplied ready-to-fly, later the aircraft was supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft. Both the tandem-seat Sunny Sport and the side-by-side versions were produced by Dewald. Both versions feature a number of small, but significant, design changes.
The price in 2009 was €13499, and €21,000 (assembled, 2011). 
Variants:
Sunny Light
Version with open cockpit
Engine: 1 × Rotax 582, 48 kW (64 hp)
Wingspan: 7 m (23 ft 0 in)
Wing area: 17 sq.m (180 sq ft)
Empty weight: 220 kg (485 lb)
Gross weight: 450 kg (992 lb)
Fuel capacity: 44 litres (9.7 imp gal; 12 US gal)
Optional fuel capacity: 80 litres (18 imp gal; 21 US gal)
Maximum speed: 145 km/h (90 mph; 78 kn)
Cruise speed: 100 km/h (62 mph; 54 kn)
Stall speed: 55 km/h (34 mph; 30 kn)
Rate of climb: 4 m/s (790 ft/min)
Seats: 2
Sunny Sport
Two seat tandem version with enclosed or semi-enclosed cockpit
Sunny Side-By-Side
Version with side-by-side configuration seats
Sunny Targa
Fully enclosed version.
Sunny Amphibian
Version with amphibious floats
Engine: Rotax 582, 65 hp
HP range: 50-90
Height: 6.42 ft
Length: 12 ft
Wing span: 23 ft
Wing area: 184 sq.ft
Fuel cap: 14 USG
Weight empty: 396 lbs
Gross: 816 lbs
VNE: 76 kt / 87 mph / 140 kmh
Speed max: 80 mph
Cruise: 62 mph
Range: 220 sm
Stall: 31 mph
ROC: 1180 fpm
Take-off dist: 130 ft
Seats: 2
Landing gear: nose wheel
Engine: Hirth 2706, 65 hp
Wing span: 7 m
Wing area: 17 sq.m
MAUW: 450 kg
Empty weight: 170 kg
Fuel capacity: 50 lt
Max speed: 150 kph
Cruise speed: 120 kph
Minimum speed: 65 kph
Climb rate: 5 m/s
Certification: VZ
Seats: 2
Fuel consumption: 12 lt/hr
Price (1998): 37,000 DM
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