The airframe is a slightly modified LIBELLE A380 by the German manufacturer Hoellein (hoelleinshop.com). According to the recommendation of the manufacturer a Hacker A20 evo brushless outrunner motor is used together with an Aeronaut CAM Carbon 13 x 6,5 prop and a 40A BEC controller.

Initially, monocrystalline solar cells of the German firm Lemo Solar (lemo-solar.de) were used. Specifications of a single cell:

• dimensions: 156mm x 78mm
• short circuit current: 4.349A
• open circuit voltage: 0.61V
• nominal power: 2.050W
• mass: 5.75g

The cells were formerly taped to the wing and the airfoil had been cut straight in this area:

The initial cells have proven to be too fragile as some broke during transport or storage of the wing. The solar module has been replaced completely now. 60 cut to half Sunpower Maxeon C60 cells are laminated with glass fiber and HT2 epoxy resin for better protection. The lamination provides a lot of stability and all the same maximum transparency and light weight. The entire solar module mass is about 300g. There are more advantages compared to the old panel: The module is flexible allowing it to adapt to the airfoil, therefore a greater part of the wing can be covered. Moreover it features a higher efficiency and has a higher nominal output power. The cells are connected in a 30S2P configuration. The module specifications (at STC):

• open circuit voltage: 20V
• short cut current: 6A
• nominal power: ca. 96W
• area: ca. 46dm2
• mass: ca. 300g
• dimensions of a single cell: 125 x 6.25mm

The following Maximum Power Point Tracker with integrated charge controller of the American firm Genasun is used: GV-5 Solar Charge Controller with MPPT for Lithium batteries (Homepage).

The brushless controller and the MPPT limit the battery range to 3S LiPo batteries. The capacity can be chosen freely according the flight requirements as the fuselage provides a vast amount of space.

• optimized prop
• wing with reduced dihedral and ailerons
• installation of an autopilot for endurance flight