[1][2] A total of 42 HP-11s were built from kits and plans before production was ended in favour of the Schreder HP-14.

[1][2] Flying the HP-11 in the 1962 US Nationals, Schreder came in third in the competition and had the longest flight, 469 mi (755 km).

Schreder also flew it to third place in the Open Class at the 1963 World Gliding Championships held at Junín, Buenos Aires Province, Argentina.

[1][2] In April 2011 there were 28 HP-11s registered with the US Federal Aviation Administration and three with Transport Canada.

[3][4] Data from Sailplane Directory and Soaring[1][2]General characteristics Performance