Blue Yonder EZ King Cobra

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EZ King Cobra
Role Kit plane
National origin Canada
Manufacturer Blue Yonder Aviation
Designer Wayne Winters
First flight 1998
Introduction 1998
Primary user Private owners
Number built 1
Developed from Merlin
Variants EZ Harvard

The Blue Yonder EZ King Cobra is a Canadian designed and built, single-engined, single-seat aircraft provided as a completed aircraft or in kit form by Blue Yonder Aviation. The aircraft is approximately a 60% scale replica of the Second World War Bell P-63 Kingcobra fighter.[1]

The aircraft can be constructed in Canada as a basic ultra-light, or amateur-built aircraft, but is not currently available as an advanced ultra-light.[2][3]


The EZ King Cobra was designed by Wayne Winters of Indus, Alberta and based on the earlier EZ Merlin. The project was started as a customer request for an ultralight category scale replica of a fighter and was later offered as a commercially available kit aircraft.

Winters created the EZ King Cobra by designing a new cantilever wing based on the Merlin wing, itself based on the Lazair wing design. The fuselage is constructed of welded 4130 steel tube and has a canopy and fin that resembles the original fighter design. The aircraft retained the Junker's ailerons of the original Merlin wing along with the Clark "Y" airfoil and construction featuring a leading edge "D" cell and foam ribs. The prototype is powered by a Rotax 582 two stroke engine of 64 hp (48 kW).[1][4]

The prototype of the new design flew in 1998. In the basic ultralight version gross weight is limited to the category maximum of 1,200 lb (544 kg).[1]

The EZ King Cobra can accommodate a variety of powerplants:[5]

Operational history[edit]

Despite being widely demonstrated no further orders have been received for the type and the prototype remains the sole flying example.[2]

Specifications (Rotax 582)[edit]

Data from Blue Yonder website[1]

General characteristics

  • Crew: one
  • Length: 21 ft (6.4 m)
  • Wingspan: 27 ft (8.2 m)
  • Height: 6 ft (1.8 m)
  • Wing area: 158 sq ft (14.7 sq m)
  • Airfoil: Clark Y[4]
  • Empty weight: 543 lb (246 kg)
  • Useful load: 657 lb (298 kg)
  • Loaded weight: 1200 lb (544 kg)
  • Powerplant: 1 × Rotax 582 fixed pitch, 64 hp (48 kW)
  • Propellers: 1 propeller, 1 per engine


See also[edit]


  1. ^ a b c d Winters, Wayne (n.d.). "EZ King Cobra". Archived from the original on 2009-02-26. Retrieved 2009-03-02. 
  2. ^ a b Transport Canada (7 November 2016). "Canadian Civil Aircraft Register". Retrieved 7 November 2016. 
  3. ^ Transport Canada (November 2008). "Listing of Models Eligible to be Registered as Advanced Ultra-Light Aeroplanes (AULA)". Retrieved 2009-03-02. 
  4. ^ a b Lednicer, David (October 2007). "The Incomplete Guide to Airfoil Usage". Retrieved 2009-02-28. 
  5. ^ Winters, Wayne (n.d.). "EZ King Cobra Price Lists". Archived from the original on 2009-03-17. Retrieved 2009-03-02. 

External links[edit]