Trisha Shetty (Editor)

Schreder HP 18

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Top speed
  
240 km/h

Wingspan
  
15 m

Length
  
7.07 m

Designer
  
Richard Schreder

Schreder HP-18 httpsuploadwikimediaorgwikipediacommonsthu

Various schreder hp 18 t o and landings feb 2012 crystalaire ca


The HP-18 is a Richard Schreder-designed metal Racing Class sailplane that was offered as a kit for homebuilding during the 1970s and 1980s.

Contents

Design and development

The HP-18 is a flapped (15-meter) sailplane featuring a V-tail and 90-degree flaps for glidepath control. The fuselage is composed of a prefabricated composite forward fuselage and a semi-monocoque aft fuselage, and features steeply reclined seating and a side-stick controller although modifications using a conventional stick have been made.

Major features:

  • Very low cockpit with reclining seating position
  • Sidestick (changed to conventional stick by some homebuilders)
  • Two-piece canopy (changed to single piece forward opening by some homebuilders)
  • V-tail that folds upwards for easy storage
  • Wing structure composed of spars with caps pre-machined from solid aluminium plate and aluminium wing skins bonded to closely spaced foam ribs
  • Fiberglass fuselage pod, wing tip skids and tail fairings
  • Aluminium tail cone
  • Winglets added by some homebuilders
  • Water ballast carried inside the hollow aluminium wing spars
  • Typical Schreder trailing edge flaps/airbrakes partially interconnected with the ailerons

    • Variants

    As most homebuilts, the HP-18 has been constructed with many variations in detail. Perhaps the most significant version is the Super HP-18 developed by Canadians Ed Hollestelle and Udo Rumpf, which features a modified wing airfoil, winglets, a front-hinged canopy, conventional control stick and higher ballast capacity.

    Aircraft on display

  • EAA Airventure Museum, Oshkosh, Wisconsin
  • National Soaring Museum, Elmira, New York
  • US Southwest Soaring Museum, Moriarty, New Mexico

    • Specifications

    General characteristics

  • Crew: One pilot
  • Length: 23 ft 2.4 in (7.07 m)
  • Wingspan: 49 ft 2 in (15.00 m)
  • Wing area: 113 ft2 (10.5 m2)
  • Aspect ratio: 21.4
  • Empty weight: 470 lb (213 kg)
  • Gross weight: 970 lb (446 kg)

    • Performance

  • Maximum speed: 150 mph (240 km/h)
  • Maximum glide ratio: 38
  • Rate of sink: 126 ft/min (0.6 m/s)

    • References

    Schreder HP-18 Wikipedia
    (Text) CC BY-SA


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