Answer the following question: Information: - Derbyshire (or ; abbreviated Derbys. or Derbs.) is a county in the East Midlands of England. A substantial portion of the Peak District National Park lies within Derbyshire, containing the southern extremity of the Pennine range of hills which extend into the north of the county. The county contains part of the National Forest, and borders on Greater Manchester to the northwest, West Yorkshire to the north, South Yorkshire to the northeast, Nottinghamshire to the east, Leicestershire to the southeast, Staffordshire to the west and southwest and Cheshire also to the west. Kinder Scout, at 636 metres (2,087ft), is the highest point in the county, whilst Trent Meadows, where the River Trent leaves Derbyshire, is its lowest point at 27 metres (89ft). The River Derwent is the county's longest river at 66 miles (106km), and runs roughly north to south through the county. In 2003 the Ordnance Survey placed Church Flatts Farm at Coton in the Elms (near Swadlincote) as the furthest point from the sea in Great Britain. - The Peak District is an upland area in England at the southern end of the Pennines. It is mostly in northern Derbyshire, but also includes parts of Cheshire, Greater Manchester, Staffordshire and Yorkshire. An area of great diversity, it is split into the northern Dark Peak, where most of the moorland is found and the geology is gritstone, and the southern White Peak, where most of the population lives and the geology is mainly limestone. - The PIK - 13 was a sailplane constructed in Finland to compete in the 1954 World Gliding Championships , held at Camphill Farm , Great Hucklow , UK . It was a conventional mid-wing design of '' workmanlike '' construction and underwent five test flights in the course of 1954 before its entry in the competition . In the championships , the PIK - 13 was flown by Antti Koskisen , who was placed 16th with 931 points . The PIK - 13 was destroyed in an accident on 26 March 1956 when the control stick broke in flight . Pilot Jorma Jalkanen parachuted to safety . - The International Gliding Commission (IGC) is the international governing body for the sport of gliding. It is governed by meetings of delegates from national gliding associations. - Great Hucklow (Old English "Hucca's burial mound") is a small village and civil parish in the Derbyshire Peak District which nestles under Hucklow Edge between the villages of Tideswell and Bradwell. It has a population of about 100, including Foolow , Grindlow plus Little Hucklow and being measured at 427 in the 2011 Census. The area is now mainly agricultural, but the village was formerly a centre of the Derbyshire lead mining industry. The lead vein or rake outcrops to the surface to the west of the village and dives under the rocks of Hucklow Edge on the western side of the village where an adit, known as Milldam Mine, has recently been reopened by Glebe Mines Ltd that connects the various deep mines that had formerly been dug along the edge. This mine is being worked for fluorspar, which is frequently found associated with lead in the vein. - In England, a civil parish is a territorial designation which is the lowest tier of local government below districts and counties, or their combined form, the unitary authority. It is an administrative parish, in contrast to an ecclesiastical parish. - Tideswell is a village and civil parish in the Peak District of Derbyshire, in England. It lies east of Buxton on the B6049, in a wide valley on a limestone plateau, at an altitude of above sea level, and is within the District of Derbyshire Dales. The population (including Wheston) was 1,820 in 2001, increasing slightly to 1,827 at the 2011 Census, making it the second-largest settlement within the National Park, after Bakewell. - Foolow (Old English possibly for "Bird Hill" or "Colourful Hill" ) is a village in the Derbyshire Peak District. The population of the village is included in the civil parish of Great Hucklow - The parish of Little Hucklow is situated in north Derbyshire. Whilst it is a separate civil parish in the Derbyshire Dales District, the Parish Council is joint with Great Hucklow, and Grindlow. The parish consists of the village of Little Hucklow and the hamlets of Coplow Dale and Windmill. The population of the parish is about 120 reducing to less than 100 at the 2011 Census. The population is now included in the civil parish of Great Hucklow. It lies within the Peak District National Park, under Hucklow Edge. The neighbouring villages are Bradwell, Derbyshire to the north, Great Hucklow to the east and Tideswell to the south. The village lies just west of the B6049 about a mile and a half north of where it crosses the A623 at the Anchor Inn. The village is linear and is aligned east-west. - The Southern Hemisphere is the half sphere of Earth which is south of the equator. It contains all or parts of five continents (Antarctica, Australia, about 90% of South America, the southern third of Africa, and several southern islands off the continental mainland of Asia), four oceans (Indian, South Atlantic, Southern, and South Pacific) and most of the Pacific Islands in Oceania. Its surface is 80.9% water, compared with 60.7% water in the case of the Northern Hemisphere, and it contains 32.7% of Earth's land. - The World Gliding Championships (WGC) is a gliding competition held every two years or so by the FAI Gliding Commission. The dates are not always exactly two years apart, often because the contests are sometimes held in the summer in the Southern Hemisphere. - Gliding is a recreational activity and competitive air sport in which pilots fly unpowered aircraft known as gliders or sailplanes using naturally occurring currents of rising air in the atmosphere to remain airborne. The word "soaring" is also used for the sport. - Old English or Anglo-Saxon is the earliest historical form of the English language, spoken in England and southern and eastern Scotland in the early Middle Ages. It was brought to Great Britain by Anglo-Saxon settlers probably in the mid 5th century, and the first Old English literary works date from the mid-7th century. After the Norman Conquest of 1066, English was replaced, for a time, as the language of the upper classes by Anglo-Norman, a relative of French, and Old English developed into the next historical form of English, known as Middle English. What entity does 'pik-13' has the relation 'subclass of' with?
Answer:
aircraft