The Cozy Mark IV is a 4-place, single engine, homebuilt light aircraft designed by Nat Puffer. The aircraft is constructed from foam and fiberglass and can cruise at 180 - 190 knots. The Cozy Mark IV is constructed from materials such as Divinycell, blue styrofoam, polyurethane foam and fiberglass (RA7715 and RA7725), MGS L285 and MGS L335 epoxy systems or EZ-Poxy. 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. The Cozy is not just similar to the Rutan Long-EZ, but is a widened derivative of that aircraft, designed with blessings from Burt Rutan. Like the EZ, it is usually built with a retractable nose gear and fixed main gear. Also like the EZ, they often are parked in the lowered front position known as grazing. Some Cozy's are built with retractable main gear as well; this is a modification that offers performance benefits, including gaining a few knots more to the top speed although maximum wing fuel tank capacity is reduced to accommodate the retracted gear. The Cozy III was a 3-place and the predecessor of the 4-place. 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 Cozy Mark IV has a plans maximum gross weight of 2050 lb and cruises at 170 knots (~200 statute mph). Nat Puffer designed the aircraft as a high speed cross-country VFR aircraft, although many equip their planes with IFR capabilities. The Cosy Classic is the European version of Cozy Mark III, which offers a forward opening canopy and some other modifications. The forward opening canopy design is available from Uli Wolter, the designer of the Cosy Classic modifications. 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 engines, auto conversions like Mazda 13B rotary, Subaru and T-58 turbine.

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