The Christavia Mk IV (Christ-in-Aviation) is a Canadian
homebuilt aircraft
Homebuilt aircraft, also known as amateur-built aircraft or kit planes, are constructed by persons for whom this is not a professional activity. These aircraft may be constructed from "scratch", from plans, or from assembly kits.Armstrong, Kenn ...
that was designed by Ron Mason and produced by
Elmwood Aviation of
Frankford, Ontario (formerly in
Belleville, Ontario
Belleville is a city in Ontario, Canada situated on the eastern end of Lake Ontario, located at the mouth of the Moira River and on the Bay of Quinte. Belleville is between Ottawa and Toronto, along the Quebec City-Windsor Corridor. Its population ...
). The aircraft is supplied in the form of plans for amateur construction.
[Purdy, Don: ''AeroCrafter - Homebuilt Aircraft Sourcebook, Fifth Edition'', page 150. BAI Communications, 15 July 1998. ]
Design and development
Designed for African missionary work the Mark IV is a development of the
Christavia Mk I
The Christavia Mk I is a Canadian two-seats in tandem homebuilt aircraft designed by Ron Mason. The aircraft is supplied in the form of plans for amateur construction. Designed for missionary flying in Africa, the aircraft's name means "Chris ...
, with greater wingspan, a longer
fuselage
The fuselage (; from the French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds crew, passengers, or cargo. In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraft t ...
and two additional seats. The aircraft features a
strut-braced
In aeronautics, bracing comprises additional structural members which stiffen the functional airframe to give it rigidity and strength under load. Bracing may be applied both internally and externally, and may take the form of strut, which act in ...
high-wing
A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple planes.
A monoplane has inherently the highest efficiency and lowest drag of any wing confi ...
, a four-seat enclosed cabin with doors, fixed
conventional landing gear
Conventional landing gear, or tailwheel-type landing gear, is an aircraft undercarriage consisting of two main wheels forward of the center of gravity and a small wheel or skid to support the tail.Crane, Dale: ''Dictionary of Aeronautical Term ...
and a single engine in
tractor configuration
In aviation, the term tractor configuration refers to an aircraft constructed in the standard configuration with its engine mounted with the propeller in front of it so that the aircraft is "pulled" through the air. Oppositely, the pusher c ...
.
The aircraft fuselage is made from welded
4130 steel
41xx steel is a family of SAE steel grades, as specified by the Society of Automotive Engineers (SAE). Alloying elements include chromium and molybdenum, and as a result these materials are often informally referred to as chromoly steel (common ...
tubing, while the wing is of all-wooden construction, with all surfaces covered with
doped aircraft fabric
Aircraft fabric covering is a term used for both the material used and the process of covering aircraft open structures. It is also used for reinforcing closed plywood structures. The de Havilland Mosquito is an example of this technique, as are ...
. Later models have an
aluminum
Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It has ...
wing spar
In a fixed-wing aircraft, the spar is often the main structural member of the wing, running spanwise at right angles (or thereabouts depending on wing sweep) to the fuselage. The spar carries flight loads and the weight of the wings while on t ...
. Its span wing employs a custom Mason
airfoil
An airfoil (American English) or aerofoil (British English) is the cross-sectional shape of an object whose motion through a gas is capable of generating significant lift, such as a wing, a sail, or the blades of propeller, rotor, or turbine.
...
, mounts
flaps and has a wing area of . The wing is supported by "V" struts with
jury struts
In aeronautics, bracing comprises additional structural members which stiffen the functional airframe to give it rigidity and strength under load. Bracing may be applied both internally and externally, and may take the form of strut, which act in ...
. The standard engine used is the
Lycoming O-320
The Lycoming O-320 is a large family of naturally aspirated, air-cooled, four-cylinder, direct-drive engines produced by Lycoming Engines. They are commonly used on light aircraft such as the Cessna 172 and Piper Cherokee. Different variants ...
powerplant.
The Christavia Mk IV has a typical empty weight of and a gross weight of , giving a useful load of . With full fuel of the payload for crew, passengers and baggage is .
Plans are marketed by
Aircraft Spruce & Specialty Co
Aircraft Spruce & Specialty Co. is an American producer of aircraft parts and services including plans for homebuilt aircraft.
History
Aircraft Spruce Co. was founded in 1965 by Bob and Flo Irwin as a follow-on to founding Fullerton Air Parts ...
. Ron Mason sold the rights to the Christavia series of aircraft to Aircraft Spruce and no longer supplies the plans or support.
The designer estimates the construction time from the supplied plans as 2600 hours.
Operational history
By 1998 the designer reported that 250 examples were flying.
In December 2016 five examples were
registered in the United States with the
Federal Aviation Administration
The Federal Aviation Administration (FAA) is the largest transportation agency of the U.S. government and regulates all aspects of civil aviation in the country as well as over surrounding international waters. Its powers include air traffic m ...
and eight with
Transport Canada
Transport Canada (french: Transports Canada) is the department within the Government of Canada responsible for developing regulations, policies and services of road, rail, marine and air transportation in Canada. It is part of the Transportati ...
.
Specifications (Christavia Mk IV)
References
External links
*
{{Elmwood Aviation aircraft
Christavia Mk IV
The Christavia Mk IV (Christ-in-Aviation) is a Canadian homebuilt aircraft that was designed by Ron Mason and produced by Elmwood Aviation of Frankford, Ontario (formerly in Belleville, Ontario). The aircraft is supplied in the form of plans ...
1980s Canadian civil utility aircraft
Single-engined tractor aircraft
High-wing aircraft
Homebuilt aircraft