 After the HP-9, Schreder went on to develop the HP-10, his first attempt at developing a glider specifically for kit manufacture and construction by sailplane homebuilders.This project was handed off to Heliosoar, a company founded by Stephen DuPont to manufacture sailplane kits.Schreder immediately started on the HP-11, completing the prototype in time to fly it to a third-place finish in the 1963 World Gliding Championships in Junín, Argentina.