Christavia Mk IV

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Christavia Mk IV
PH-DYL (8321448925).jpg
Role Homebuilt aircraft
National origin Canada
Manufacturer Elmwood Aviation
Designer Ron Mason
Status Plans available (2013)
Number built 250
Unit cost
US$275.00 (plans only, 2013)
Developed from Christavia Mk I

The Christavia Mk IV (Christ-in-Aviation) is a Canadian homebuilt aircraft that was designed by Ron Mason and produced by Elmwood Aviation of Belleville, Ontario. The aircraft is supplied in the form of plans for amateur construction.[1][2]

Design and development[edit]

Designed for African missionary work the Mark IV is a development of the Christavia Mk I, with greater wingspan, a longer fuselage and two additional seats. The aircraft features a strut-braced high-wing, a four seat enclosed cabin with doors, fixed conventional landing gear and a single engine in tractor configuration.[1]

The aircraft fuselage is made from welded 4130 steel tubing, while the wing is of all-wooden construction, with all surfaces covered with doped aircraft fabric. Later models have an aluminum wing spar. Its 35.50 ft (10.8 m) span wing employs a custom Mason airfoil, mounts flaps and has a wing area of 177.3 sq ft (16.47 m2). The wing is supported by "V" struts with jury struts. The standard engine used is the 150 hp (112 kW) Lycoming O-320 powerplant.[1][3]

The Christavia Mk IV has a typical empty weight of 1,100 lb (500 kg) and a gross weight of 2,200 lb (1,000 kg), giving a useful load of 1,100 lb (500 kg). With full fuel of 41 U.S. gallons (160 L; 34 imp gal) the payload for crew, passengers and baggage is 854 lb (387 kg).[1]

Plans are marketed by Aircraft Spruce & Specialty Co as well as Mason's company, Elmwood Aviation. The designer estimates the construction time from the supplied plans as 2600 hours.[1][2]

Operational history[edit]

By 1998 the designer reported that 250 examples were flying.[1]

In December 2013 four examples were registered in the United States with the Federal Aviation Administration and eight with Transport Canada.[4][5]

Specifications (Christavia Mk IV)[edit]

Data from AeroCrafter and The Incomplete Guide to Airfoil Usage[1][3]

General characteristics

  • Crew: one
  • Capacity: three passengers
  • Length: 22 ft 3 in (6.78 m)
  • Wingspan: 25 ft 6 in (7.77 m)
  • Wing area: 177.3 sq ft (16.47 m2)
  • Airfoil: Mason
  • Empty weight: 1,100 lb (499 kg)
  • Gross weight: 2,200 lb (998 kg)
  • Fuel capacity: 41 U.S. gallons (160 L; 34 imp gal)
  • Powerplant: 1 × Lycoming O-320 four cylinder, air-cooled, four stroke aircraft engine, 150 hp (110 kW)
  • Propellers: 2-bladed fixed pitch


  • Maximum speed: 130 mph (209 km/h; 113 kn)
  • Cruise speed: 120 mph (104 kn; 193 km/h)
  • Stall speed: 48 mph (42 kn; 77 km/h)
  • Range: 400 mi (348 nmi; 644 km)
  • Service ceiling: 19,000 ft (5,791 m)
  • Rate of climb: 800 ft/min (4.1 m/s)
  • Wing loading: 12.4 lb/sq ft (61 kg/m2)


  1. ^ a b c d e f g Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, Fifth Edition, page 150. BAI Communications, 15 July 1998. ISBN 0-9636409-4-1
  2. ^ a b Aircraft Spruce & Specialty Co (2013). "Christavia". Retrieved 14 December 2013. 
  3. ^ a b Lednicer, David (2010). "The Incomplete Guide to Airfoil Usage". Retrieved 14 December 2013. 
  4. ^ Federal Aviation Administration (14 December 2013). "Make / Model Inquiry Results". Retrieved 14 December 2013. 
  5. ^ Transport Canada (14 December 2013). "Canadian Civil Aircraft Register". Retrieved 14 December 2013. 

External links[edit]