Dear Experts,Anyone tried using elliptical wing for small UAS (weight ~3.5 kg, wingspan ~6 ft). In theory it seems efficient, however in manned aircraft it is not used due to manufacturing/cost issue. However,  manufacturing may not be a big issue…

Dear Experts,I am currently trying to build a solar powered plane. As solar cell, I choose Sunpower C60 monocrystalline cells due its high efficiency and low price.However, due it's big size (12.5cm X 12.5cm), it seems that I won't be able to use it…