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The HP-14 is a Richard Schreder

Richard Schreder

Richard E. Schreder was an American naval aviator and sailplane developer, responsible for design and development of the HP/RS-series kit sailplanes marketed from 1962 until about 1982...

-designed all-metal glider aircraft

Glider aircraft

Glider aircraft are heavier-than-air craft that are supported in flight by the dynamic reaction of the air against their lifting surfaces, and whose free flight does not depend on an engine. Mostly these types of aircraft are intended for routine operation without engines, though engine failure can...

 that was offered as a kit for homebuilding

Homebuilt aircraft

Also known as amateur-built aircraft or kit planes, homebuilt aircraft are constructed by persons for whom this is not a professional activity. These aircraft may be constructed from "scratch," from plans, or from assembly kits.-Overview:...

 during the 1960s and 1970s. It was originally developed by retrofitting improved wings to the fuselage and tail of the HP-13

Schreder HP-13

|-See also:-External links:*...

. Schreder won the 1966 US national soaring championship in the prototype HP-14.

The HP-14 features a folding V-tail

V-tail

In aircraft, a V-tail is an unconventional arrangement of the tail control surfaces that replaces the traditional fin and horizontal surfaces with two surfaces set in a V-shaped configuration when viewed from the front or rear of the aircraft...

 and 90-degree flaps for glidepath control. The fuselage and wings are of all-aluminum riveted construction.

Development

Development of the HP-14 was carried out by several parties but the biggest modifications to the design were carried out by Slingsby Aviation

Slingsby Aviation

Slingsby Aviation is a British aircraft company based in Kirkbymoorside, North Yorkshire, England. The Slingsby business was founded on the building and design of gliders and sailplanes. From the early 1930s to about 1970 it built over 50% of all British club gliders and had success at national and...

 at Kirkbymoorside

Kirkbymoorside

Kirkbymoorside is a small market town and civil parish in the Ryedale district of North Yorkshire, England which lies approximately 25 miles north of York midway between Pickering and Helmsley, and has a population of approximately 3,000.-History:...

, North Yorkshire

North Yorkshire

North Yorkshire is a non-metropolitan or shire county located in the Yorkshire and the Humber region of England, and a ceremonial county primarily in that region but partly in North East England. Created in 1974 by the Local Government Act 1972 it covers an area of , making it the largest...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

, where a 20-metre wing was fitted on the prototype HP-14C, along with an enlarged V-tail. Later Slingsby production aircraft had a conventional cruciform tail. Slingsby production and sales were hampered by certification problems, particularly with flap actuation at high speed, and the disastrous fire at Kirbymoorside on 18 November 1968. Slingsby produced only three aircraft. Other homebuilders incorporated their own modifications but none achieved production status.

Variants

HP-14

Developed from a modified HP-13 fuselage, with V-tail, using the Wortmann section wings of the Schreder HP-12

HP-14C

An 18-meter span HP-14 produced by Slingsby with a conventional cruciform tail, flown by Nicholas Goodhart at the 1968 World Championships at Leszno in Poland. The initial prototype used an enlarged V-tail.

HP-14T

The HP-14 fitted with the 18-meter 'C' wing and a T-tail.

Krutchkoff SHP-1

An HP-14 with a new fuselage designed by Andre Krutchkoff.

Zauner OZ-4

Modified version with a 19.2 m (63 ft) wingspan and a 850 lb (386 kg) gross weight.

Specifications (Slingsby HP-14C)