The HP-14 is a

Richard Schreder Richard E. Schreder (25 September 1915 – 2 August 2002) 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. Schreder also foun ...

-designed all-metal

glider aircraft A glider is a fixed-wing aircraft that is supported in flight by the dynamic reaction of the air against its lifting surfaces, and whose free flight does not depend on an engine. Most gliders do not have an engine, although motor-gliders have ...

that was offered as a kit for homebuilding during the 1960s and 1970s. It was originally developed by retrofitting improved wings to the fuselage and tail of the HP-13, and first flew in 1966. Schreder won the 1966 US national soaring championship in the prototype HP-14. The HP-14 features a folding

V-tail The V-tail or ''Vee-tail'' (sometimes called a butterfly tail or Rudlicki's V-tailGudmundsson S. (2013). "General Aviation Aircraft Design: Applied Methods and Procedures" (Reprint). Butterworth-Heinemann. p. 489. , 9780123973290) of an 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 was a British aircraft manufacturer based in Kirkbymoorside, North Yorkshire, England. The company was founded to design and build gliders and sailplanes. From the early 1930s to around 1970 it built over 50% of all British c ...

Kirkbymoorside Kirkbymoorside () is a market town and civil parish in the Ryedale district in North Yorkshire, England. It is north of York, It is also midway between Pickering and Helmsley, on the edge of the North York Moors National Park. It had a populat ...

North Yorkshire North Yorkshire is the largest ceremonial counties of England, ceremonial county (lieutenancy area) in England, covering an area of . Around 40% of the county is covered by National parks of the United Kingdom, national parks, including most of ...

England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...

, 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 wingspan and a gross weight.

Specifications (Slingsby HP-14C)

References

Schreder Designs webpage
*Simons, Martin. "Slingsby Sailplanes". Shrewsbury, Airlife. 1996.

*Coates, Andrew. "Jane's World Sailplanes & Motor Gliders new edition". London, Jane's. 1980. {{Otto Zauner aircraft 1960s United States sailplanes 1960s British sailplanes HP-14C Schreder aircraft V-tail aircraft Aircraft first flown in 1966