The all-metal V-tail HP-10 was flown by designer R. E. 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.

The HP-10 was modified by Steve du Pont.

Helisoar bought the production rights and produced the HP-10 in kit form. Some ships were modified with fiberglass Hoerner wingtips made available by Helisoar.

One belongs to the National Soaring Museum.

Wing span: 14.63m
Wing area: 10.59sq.m
Empty Weight: 243kg / 525lb
Payload: 111kg / 245lb
Gross Weight: 354kg / 780lb
Wing Load: 33.43kg/sq.m / 6.75lb/sq.ft
Water Ballast: 0 Aspect ratio: 20.2
Airfoil: NACA 65 (3)-618 mod.
L/DMax: 35 97 kph / 52 kt / 60 mph
MinSink: 0.67 m/s / 2.2 fps / 1.30 kt
Seats: 1
No. Built: 9