Rand Robinson KR-1 explained

The Rand Robinson KR-1 is a single-seat, single-engine sport aircraft designed in the United States in the early 1970s and marketed for homebuilding.[1] [2] [3] A two-seat version is marketed as the KR-2.[2] [3] It is a low-wing cantilever monoplane of conventional design with an enclosed cockpit and tailwheel undercarriage.[3] [4] As originally designed, the main undercarriage units of the KR-1 and basic KR-2 were manually retractable, folding backwards into the wings, while the KR-2T tandem-seat version had fixed tricycle undercarriage.[5] However, some builders choose fixed tailwheel or even fixed tricycle undercarriage for KR-1s and KR-2s.[6]

Kits for the KR-1, KR-2 and KR-2S are supplied by nVAero of Mission Viejo, California/Corona, California, United States.[7] [8]

Design and development

The KR-1's wings have a two-spar construction; the front spar of spruce, and the rear spar from spruce and plywood.[4] The wing ribs are formed from polyurethane foam, and the space around them filled with the same material before the entire wing structure is covered with fabric impregnated with epoxy resin.[4] Similar construction is used in the KR-2, with an RAF 48 airfoil cross-section (some later models have adapted the AS 5046 airfoil, for increased speed at the expense of poorer low-speed handling), and the wings are removable outboard the landing gear. Similar construction is used in the empennage and control surfaces.

The fuselage is built around a wooden framework, the lower part skinned in plywood and the upper part built up of polystyrene foam covered in epoxy-coated fabric.[4] KR-1 builders have the choice of three different upper fuselage configurations: the "fastback" with a turtledeck behind the cockpit, the "pursuit" with a fighter-style bubble canopy, and the "sportsman" with an open cockpit and a small fairing behind it for rollover protection.[9]

The design has proved popular, with over 10,000 sets of plans sold, including 6,000 sets of KR-1 plans and 4,500 sets of KR-2 plans sold by 1979.[2] From these, over 200 KR-1s[4] and 350 KR-2s[10] were flying by 1987. nVAero's founder Steve Glover reported in 2010 that over 2,000 KRs were flying, worldwide.

Plans and kits were still available in 2022.[11]

Variants

Aircraft on display

References

External links

Notes and References

  1. Grimstead, Bob "Flight Review: The Rand KR-2", September 13, 2010, Kitplanes, retrieved November 13, 2020
  2. Taylor 1989, p.757
  3. Markowski 1979, p.286
  4. Jane's All the World's Aircraft 1987–88, p.696
  5. Jane's All the World's Aircraft 1987–88, p.696–97
  6. Cox 1995, p.22
  7. Vandermeullen, Richard: 2012 Kit Aircraft Buyer's Guide, Kitplanes, Volume 28, Number 12, December 2011, page 63. Belvoir Publications. ISSN 0891-1851
  8. Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, page 120. Flying Pages Europe SARL, 2015.
  9. Markowski 1979, p.288
  10. Jane's All the World's Aircraft 1987–88, p.697
  11. Web site: Welcome to nV|Aero! The Exclusive Manufacturer of the KR Series Aircraft.. nv-aero.com.
  12. Bayerl, Robby; Martin Berkemeier; et al: World Directory of Leisure Aviation 2011-12, page 113. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X
  13. "Rand Robinson KR-1 - N1436"
  14. Web site: Rand Robinson KR-2 VH-XXS The Beast C/N Q082 . 22 September 2013. Queensland Air Museum. Queensland Air Museum. 23 August 2013.
  15. Web site: Aircraft Exhibits. 7 May 2019. Wings Over the Rockies Air and Space Museum. Wings Over the Rockies Air and Space Museum. wingsmuseum.org. https://web.archive.org/web/20181023021427/https://wingsmuseum.org/museum/exhibits/aircraftexhibits/. 23 October 2018 .

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