The V-tail HP-10 was flown by designer Schreder in the 1961 U.S. Nationals, winning the Stroukoff Trophy for a 57 kph/ 31 kt/ 35.5 mph 229 km/ 142 miles Goal & Return flight. Helisoar bought the production. Some ships were modified with fiberglass Hoerner wingtips mada available by Helisoar. One belongs to the National Soaring…

The HP-11 was produced in 1962 in time for the 1962 U.S. Nationals, in which Schreder placed third and made the longest flight, 754.8 km./ 469 miles; he later placed third in the Open Class at the 1963 World Championship at Junin, Argentina. The –11A, an improved version, has a retractable wheel. Some significant modifications…

The HP-19 features a straight tapered wing employing a Schreder modification of a Wortmann airfoil and tip winglets. Large flaps provide glidepath control.

The HP-18 is one of the most successful of all U.S. homebuilt aircraft in terms of number built. The ship has a forward fuselage of fiberglass and a sheet metal rear fuselage. The wing is built up from a metal spar with foam ribs to which the aluminum skin is bonded. This 15 m. racing…

The HP-16 involved major changes in Schreder’s HP-15 design, with a different wing similar to the RS-15 of much lower aspect ratio and grater area. The aluminum wing skins are bonded to foam ribs, including rivet use and construction time. The Hp-16 retains the very effective 90 degrees Schreder flaps. One belongs to the National…