Airkraft Sunny

The Sunny Light is an ultra -light aircraft with Boxwing - wing concept.

History

Developed the Sunny light in the early 1980s by Dieter M. Schulz- Hoos. The first prototypes of this aircraft were tested in 1987. The patent application as an ultra-lightweight composite wing aircraft at the European Patent Organisation on 29 October 1988 the patent was granted on 17 May 1989. As of 1989, the Sunny was produced in series ( about 150 pieces). After the company went bankrupt the designer, the production between 1999 and 2008 by the company Dewald was light aircraft resumed ( 28 pieces ). 2008, the company has AIRKRAFT light aircraft from Beringen GmbH acquired the assets and rights to manufacture and was responsible for the pattern of care. The company meldetet in July 2010 bankruptcy.

Many of the remaining machines are now available on the French island of Réunion in the Indian Ocean, where they form a small " fleet ".

Construction

Aerodynamic design

The Sunny is a biplane without conventional empennage. The longitudinal stability is achieved by the staggering of the upper and swept straight lower surface. The wing tips of both wings are connected by vertical stabilizing surfaces. The lower surface has a rudder that are used as a combined lateral and elevator. The controller about the vertical axis is carried out by the spoilers. By Boxwing conception the plane is an easy-to -fly according to the manufacturer airplane.

Mechanical Design

In pipe - cloth construction built, is the supporting structure of bolted, aviation aluminum tubes tested largely of the same diameter. Consistent manufacturing accuracy is achieved by the use of special jigs. The wings and control surfaces are covered with a UV-resistant and equipped with a crack -stop function grating film.

The tube - cloth construction and the type of pipe joints have been used in the 1920s and can be seen at some exhibits in the German Museum of Masterpieces of Science and Technology in Munich.

Drive

The drive motors are used the following:

  • Hirth 3203EV, 2-stroke, 65 hp
  • Rotax 582, 2 stroke, 65 hp
  • Rotax 912, 4-stroke, 80 hp
  • BMW 1000, 4-stroke, 65-80 hp
  • Hirth 3702E, 2-stroke, 80 hp
  • Verner SVS, 4-stroke, 80 hp

Dewald also provided a four-engined variant before: On the concept included four individual 1- cylinder engines with 28 hp. However, since this concept was denied admission in Germany, it remained in this unique piece.

Variants

  • Sunny Light, 450 kg take-off weight
  • Sunny Sports, 375/400 kg take-off weight (no longer built )
  • Sunny Side - by-side seating arrangement side by side 400/450 kg take-off weight
  • Sunny Targa variant of the Sunny Side -by-side, with fiberglass full fairing, about 30 pieces 1991-1994
Insolvency Beringen, Switzerland Deutsches Museum
754930
de