In 2018, Lambach Aircraft entered the BMFA payload competition in 2018 with the Spirit of Delft. It performed admirably and was capable of competing with the other teams successfully.
It was designed to carry up to 3 bottles of 1 liter each, 1 in the fuselage and 2 under the wings. Special pods and ring holders where developed to accommodate these. The pods under the wing also served as the main landing gear attachment points, connected the twin tail booms and where streamlined to minimize drag.
With a long slender wings it was able to glide long distances to land softly even with the heavy payload in grass. The wings where made by placing long carbon fiber rods to carry compression and tensile loads from the wing bending moments. The shear between these rods where carried by a balsa wood web.
The ribs consisted of glass fiber re-enforced balsa wood to maintain the shape of the airfoil. These included lightening holes to save weight as well as allowing the wings to be taken apart during transport through the inclusion of connecting rods. This made the design light, portable and strong enough to endure some impacts. The winglets at the edge allowed for better wing vortex performance.
The twin booms consisted of carbon fiber tubes which where connected to the edges of the horizonal tail plane. The fuselage consisted of a light weight carbon rod truss structure which could also house additional batteries if needed. The loads where introduced into the wing by large glass re-enforced balsa back bones.
The whole structure was covered in shrink foil to improve drag. This allowed the whole aircraft to lift off the ground with more than 5 kilograms with a relatively small engine. Lastly, the nose landing gear was actuated to be able to steer, improving ground roll.
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