Schreder HP-11

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Schreder HP-11
HP-11
Type designation HP-11
Competition class Club
Number built 73 +
Crew 1
Length
Height
Cockpit width
Cockpit height
Wingspan 15.85 m (52 ft)
Wing area 9.66 m² (104 ft²)
Aspect ratio 26
Empty mass 204 kg (450 lb)
Water ballast NA
Maximum mass 318 kg (700 lb)
Wing loading 6.7 lb/ft²
Maximum speed 130 kt/150 mph/240 km/h
Rough air speed 105 kt/121 mph/194 km/h
Maneuver speed 105 kt/121 mph/194 km/h
Minimum sink rate 0.55 m/s (1.8 ft/s) at 47 mph (75 km/h)
Glide ratio 37:1 at 86 km/h (54 mph)
Roll rate

The Schreder HP-11 is a homebuilt glider designed by Richard Schreder in 1962. Schreder campaigned the prototype in the 1963 World Soaring Championships in Argentina, achieving a third-place finish.

After minor modifications, including adoption of retractable undercarriage and deletion of the prototype's flap-aileron interconnect, Schreder marketed the HP-11A version as a kit. Several dozen were completed and flown through the mid-1970s.

The HP-11 is constructed almost entirely of aluminum alloy, using plastics and fiberglass composites only for non-structural fairings. The wings are of conventional riveted construction. The wing spar is an I-beam assembled from 7075-T6 alloy sheet and angle extrusions.

Like other Schreder sailplanes, the HP-11 uses 90-degree flaps for glidepath control.

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