Schreder HP-18
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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.[1]
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[1] 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[2]
- National Soaring Museum, Elmira, New York[3]
- US Southwest Soaring Museum, Moriarty, New Mexico[4]
Specifications
References
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- Schreder Designs webpage
- R Johnson, A Flight Test Evaluation of the HP-18W Sailplane, Soaring, July 2003
External links
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