Cozy MK IV

Cozy MK IV
Cozy MK IV
Cozy MK IV
Role Homebuilt aircraft
National origin United States
Manufacturer Home Built
Designer Nat Puffer
Primary user Private
Developed from Rutan Long-EZ

The Cozy Mark IV is a 4-seat, single engine, homebuilt light aircraft designed by Nat Puffer. The aircraft is built from plans using basic raw materials. It is not a kit aircraft, though many small parts are available prefabricated. The Cozy is similar in design and construction to the 2-seat Rutan Long-EZ. It is a derivative of that aircraft, designed with approval from Burt Rutan. The Cozy Mark IV utilizes foam and fiberglass sandwich construction, with foam suited to the usage, fiberglass oriented for the stresses, and epoxy to bond them together. Nat Puffer designed the aircraft as a high speed cross-country VFR aircraft, although many builders equip their planes with IFR capabilities.



The aircraft is constructed primarily of fiberglass, foam, and epoxy. Urethane foam is used to form highly curved, hand-carved shapes such as the nose and wing tips. Blue rigid styrofoam is cut with a hot wire saw to form the wing cores. Thin PVC foam sheets are used to form bulkheads and the fuselage sides. Two types of woven fiberglass are used to provide the surface strength of the composite sandwich. RA7715 fiberglass is almost entirely unidirectional in its fiber orientation. RA7725 has an equal portion of perpendicular fiberglass strands. Epoxy systems used include EZ-Poxy, Safe-T-Poxy, MGS L285 and L335, and West Systems. The builder does not need pre-fabricated items to finish the aircraft except for the landing gear bow and nose gear strut which require forms and an oven for post curing, but several suppliers exist for these parts.

Previous Versions and Related Aircraft

Like the Long-EZ, the design includes a retractable nose gear and fixed main gear. With both front seats unoccupied, the center of gravity with the aircraft level is aft of the main gear. Thus, like the Long-EZ, the Cozy is parked with the nose resting on the ground, sometimes called "grazing". The nose-down position is very stable. The aircraft can withstand high winds as the wings are beyond a flying angle of attack. Some Cozy builders modify the design to include retractable main gear. This modification increases the maximum speed by a few knots. Maximum fuel tank capacity is reduced to accommodate the retracted gear.

The Cozy III was a 3-seat aircraft and the predecessor of the 4-seat Cozy Mark IV. Also designed by Nat Puffer, the Cozy III was initially referred to as simply "The Cozy". When the 4-place was announced, the qualification of the Cozy III name was required.

The Cosy Classic is the European version of Cozy III, changed to a forward opening canopy and other modifications. The forward opening canopy design is available from Uli Wolter, the designer of the Cosy Classic modifications.

Engine Types

The plans call for a Lycoming O-360 engine (180 hp) or O-320 (150-160 HP). There are Cozys flying with several different engine types:

  • Lycoming IO-360,
  • Superior Air Parts and ECI O-360 clones
  • Mazda 13B rotary
  • Subaru 2.5 and 3.3
  • T-58 turbine (one example, "The Cozy Jet")

Specifications (Cozy MK IV)

[1] General characteristics

  • Crew: one
  • Capacity: three passengers
  • Length: 16 ft 10.8 in (5.151 m)
  • Wingspan: 28 ft 1.2 in (8.565 m)
  • Height: 7 ft 10.8 in (2.408 m)
  • Wing area: 88.3 sq ft (8.20 m2)
  • Empty weight: 1,050 lb (476 kg)
  • Gross weight: 2,050 lb (930 kg)
  • Powerplant: 1 × Lycoming O-360 , 180 hp (130 kW)
  • Propellers: 2-bladed


  • Cruise speed: 190 kn; 350 km/h (220 mph) @ 75% power
  • Range: 1,000 nmi (1,200 mi; 1,900 km) At 75% power
  • Service ceiling: 20,000 ft (6,100 m)
  • Rate of climb: 20001200 ft/min (0.00847 m/s) Solo/Gross

See also

External links

  1. ^ . Cozy Aircraft Official Website. Aug 19th, 2011

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Cozy — may refer to: Contents 1 People 2 Vehicles 3 Entertainment 4 See also People Cozy Cole (1909 1981), jazz drum …   Wikipedia

  • Cozy — Co zy, n. [See {Cozy},a.] A wadded covering, often decorative, for a teakettle or other vessel to keep the contents hot. Also called {tea cozy} [1913 Webster +PJC] …   The Collaborative International Dictionary of English

  • cozy — (Brit. cosy) ► ADJECTIVE (cozier, coziest) 1) comfortable, warm, and secure. 2) not seeking or offering challenge or difficulty: the cozy belief that man is master. ► NOUN (pl. cozies) ▪ a cover to keep a teapot or a boiled egg hot …   English terms dictionary

  • cozy — [kō′zē] adj. cozier, coziest [Scot; prob. < Scand, as in Norw kose sig, to make oneself comfortable, koselig, snug] warm and comfortable; snug n. pl. cozies a knitted or padded cover placed over a teapot to keep the contents hot SYN.… …   English World dictionary

  • cozy — 1709, colsie, Scottish dialect, perhaps of Scandinavian origin (Cf. Norw. kose seg be cozy ). In Britain, usually cosy. Related: Cozily; coziness …   Etymology dictionary

  • Cozy — Co zy (k? z?), a. [Compar. {Cozier} ( z? ?r); superl. {Coziest}.] [Cf. Scot. cosie, cozie, prob. from Gael. cosach abounding in hollows, or cosagach full of holes or crevices, snug, sheltered, from cos a hollow, a crevice.] [1913 Webster] 1.… …   The Collaborative International Dictionary of English

  • cozy — *comfortable, snug, easy, restful Analogous words: sheltering, harboring, housing, lodging (see HARBOR vb): *safe, secure: contenting, satisfying (see SATISFY) Contrasted words: *miserable, wretched …   New Dictionary of Synonyms

  • cozy — see cosy …   Modern English usage

  • cozy — [adj] comforting, soft, warm comfortable, comfy, cuddled up, cushy, easeful, in clover, intimate, in velvet*, on bed of roses*, restful, safe, secure, sheltered, snug, snug as bug in rug*, snuggled down, tucked up; concepts 485,605,606 Ant.… …   New thesaurus

  • cozy — 01. They live in a [cozy] little one bedroom apartment on Cook Street. 02. Henderson is [cozy] with the boss, so he gets anything he wants. 03. We felt really [cozy] wrapped up in our sleeping bags, in front of the fire. 04. Make sure you are… …   Grammatical examples in English

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