Schreder HP-15

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**Schreder HP-15**
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Type designation	HP-15
Designer	Richard Schreder
Competition class	Standard
Crew	1
Length	22.8 ft (6.95 m)
Height
Cockpit width
Cockpit height
Wingspan	49.2 ft (15 m)
Wing area	72 ft² (6.97 m²)
Aspect ratio	33
Wing profile	Schreder 68-180
Empty mass	ca. 330 lb (150 kg)
Maximum mass	600 lb (272 kg)
Wing loading	8 lb/ft² (39.02 kg/m²)
Maximum speed	knots ( km/h)
Maneuver speed	knots ( km/h)
Speed in strong turbulence	knots ( km/h)
Minimum sink rate	ca. 98 ft/min (0.49 m/s)
Best glide ratio	ca. at knots ( km/h)

The HP-15 sailplane prototype was designed by Richard Schreder as a personal mount in which to challenge the 1969 U.S. National Soaring Championships. With an extreme 33:1 aspect ratio and a relatively low empty weight, the HP-15 was expected to generate less induced drag and therefore higher performance. The type achieved excellent glide ratios in fast flight, but had disappointing climbing ability. This was due to extensive flow separation on the upper wing surfaces during slow flight. After the Championships Schreder re-winged the fuselage to produce his next design, the HP-16.