Operational experience resulted in a greatly improved Atlas model for 1981 .
In 1980 the company introduced its first ultralight aircraft design , the Birdman Atlas , which was based on the Eipper Quicksilver .
Operational experience resulted in a greatly improved Birdman Atlas model for 1981 .
In 1980 the company introduced its first ultralight aircraft design , the Birdman Atlas , which was based on the Eipper Quicksilver .