He then produced with DuPont the first plane powered entirely by the sun, the Solar Challenger, which in 1981 flew the 163 miles from Paris to Canterbury at a height of 11, 000 feet.
Khachkars reach 1.5 metres in height, and have an ornamentally carved cross in the middle, resting on the symbol of a sun or wheel of eternity, accompanied by vegetative-geometric motifs, carvings of saints and animals.