Avro Canada CF-103

Avro Canada

Industry	Aerospace, Defence
Founded	1945
Headquarters	Toronto , Canada
Products	Aircraft, jet engines

Template:Use Canadian English Template:Infobox aircraft

The Avro Canada CF-103 was a conceptual Canadian interceptor developed by Avro Canada in the early 1950s. It was envisioned as an evolution and potential successor to the company's CF-100 Canuck, which was then entering operational service with the Royal Canadian Air Force (RCAF). Although designed to achieve transonic speeds, the CF-103 offered only a slight improvement in performance and capabilities compared to the CF-100. As a result, the project did not advance beyond the mock-up phase.

Design and development

Prior to the maiden flight of the CF-100 prototype, Avro Canada had already initiated studies for possible advanced variants of the aircraft, responding to the RCAF’s requirement for an interceptor with enhanced high-speed capabilities. Recognizing the limitations imposed by the CF-100’s original "thick," straight wing design, Chief Designer John Frost proposed modifications that included a thinner, swept wing. In December 1950, Avro Aircraft’s Design Office authorized a redesign that combined the early series CF-100 fuselage with new swept wings and tail surfaces under the C-100S study.

After joining the XC-100 project late in its development, Frost refined the initial design significantly but found that the basic wing/engine layout restricted performance to subsonic speeds. This led him to pursue a further redesign based on his independent research into more advanced swept-wing configurations.

Frost viewed this new design as an interim solution bridging the gap between the CF-100 and a more sophisticated interceptor envisioned as the C-104 project. Key modifications involved reducing both wing chord and thickness while introducing a leading-edge sweep of 42°, resulting in a near-delta wing shape. The tail surfaces were also redesigned with increased sweepback. One variant examined incorporated two streamlined fuel tanks integrated into the wing leading edges near the three-quarter span.

Scale models of the proposed CF-103 displayed a more aerodynamic wing and engine arrangement, featuring a thick wing root that blended engines into the upper fuselage. Additional design elements included outboard "pinion" fuel tanks on the wings and a moderately swept tailplane.

Despite plans for more powerful jet engines, projected performance improvements were minimal; the maximum planned diving speed was Mach 0.95, only marginally faster than the production CF-100 Mk 2 and Mk 3 models’ placarded limit of Mach 0.85. Acknowledging delays already experienced during CF-100 development, Avro management regarded Frost’s revised design as a contingency should long-term contracts for the CF-100 fail to materialize.

In 1951, Canada's Department of Trade and Commerce commissioned two prototypes along with a static test airframe under the CF-103 designation. By June that year, jigs, tooling, and detailed engineering drawings were completed, with wind tunnel testing carried out at Cornell University concluding by November. Although a wooden mock-up was constructed—including separate cockpit and engine sections partially framed—the model lacked any landing gear or internal fittings. Two tail configurations were tested initially: an early version with only swept leading edges on the tailplane and a later definitive design featuring a more sharply raked tail.

Engineering work on integrating Avro Canada Orenda 17 jet engines remained incomplete. The experimental "hybrid" powerplant combined an Orenda 8 compressor with an Orenda 11 two-stage turbine paired with an afterburner unit but had not reached full development. While an Orenda TR7 engine was initially considered, persistent issues with surging and asymmetric thrust in test flights of the more powerful Orenda 17 prevented resolution before project cancellation.

Cancellation

In 1951, flight evaluations conducted by Chief Development Test Pilot S/L Janusz Żurakowski alongside other members of the Flight Test team demonstrated that the CF-100's development had surpassed the performance goals originally set for the CF-103. Meanwhile, Frost and the Design Office shifted their focus toward more advanced designs intended as successors to the CF-100. Although the CF-103 was part of the developmental progression from the CF-100S/CF-100D towards the supersonic C-104 Advanced Fighter concept, it quickly became outdated and ultimately represented a technological dead end. The C-104, evolving into the C-104/2, would eventually transform into the Avro CF-105 Arrow. Progress on the CF-103 slowed significantly, with its first flight initially planned for summer 1952 but delayed until mid-1953.

Amid escalating Cold War tensions, Canadian authorities insisted that production of the current CF-100 fighter and development of its improved variants take priority. Consequently, Avro was compelled to terminate the faltering CF-103 program by December 1951. Canada's military involvement in the Korean War had prompted the Department of National Defence (Canada) to prepare a credible Royal Canadian Air Force deployment, including frontline fighter squadrons; however, only an Air Transport Command unit was ultimately sent. Given Avro’s ongoing difficulties with CF-100 wing spar issues—which had caused the RCAF to reject initial pre-production models—the government was rightly concerned about Avro diverting resources away from pressing priorities. Alongside the CF-103 cancellation, Avro’s other significant project, the Avro Canada C102 Jetliner, also faced suspension of production.

Although the CF-103 mock-up remained stored in the factory’s experimental bay, a pivotal event effectively ended any chance of reviving the program. On 18 December 1952, Żurakowski executed a dive from 33,000 ft (10,000 m) in a CF-100 Mk 4 prototype (RCAF Serial No. 18112), reaching Mach 1.06. This "unauthorized" flight—while Żurakowski had clearance to explore maximum speed parameters—occurred without knowledge that the Special Projects Group within the Design Office was simultaneously advocating for the CF-103 with the RCAF. The outcome of this test was decisive: it led to scrapping of the CF-103 mock-up and marked a definitive end to its development.

Specifications

File:Avro Canada CF-103 drawing.jpg

CF-103: original concept, c. 1950

References

Notes

Citations

Bibliography

• Campagna, Palmiro. Requiem for a Giant: A.V. Roe Canada and the Avro Arrow. Toronto: Dundurn Press, 2003. ISBN 1-55002-438-8.
• Milberry, Larry. The Avro CF-100. Toronto: CANAV Books, 1981. ISBN 0-9690703-0-6.
• Milberry, Larry. Sixty Years: The RCAF and CF Air Command 1924-1984. Toronto: CANAV Books, 1984. ISBN 0-9690703-4-9.
• Page, Ron. Canuck: CF-100 All Weather Fighter. Erin, Ontario: Boston Mills Press, 1981. ISBN 0-919822-39-8.
• Page, Ron; Organ, Richard; Watson, Don; Wilkinson, Les ("The Arrowheads"). Avro Arrow: The Story of the Avro Arrow from its Evolution to its Extinction. Erin, Ontario: Boston Mills Press, 1979; reprinted by Stoddart in 2004. ISBN 1-55046-047-1.
• Stewart, Greig. Shutting Down the National Dream: A.V. Roe and the Tragedy of the Avro Arrow. Toronto: McGraw-Hill-Ryerson, 1991. ISBN 0-07-551119-3.
• Valiquette, Marc-André. Destruction of a Dream: The Tragedy of Avro Canada and the CF-105 Arrow, Volume 1. Montreal: Marc-André Valiquette (self-published), 2009. ISBN 978-2-9811239-0-9.
• Zuk, Bill. Avrocar, Canada's Flying Saucer: The Story Of Avro Canada's Secret Projects. Erin, Ontario: Boston Mills Press, 2001. ISBN 1-55046-359-4.
• Zuk, Bill. Janusz Zurakowski: Legends in the Sky. St. Catharines, Ontario: Vanwell, 2004. ISBN 1-55125-083-7.

External links

• CF-103
• "CF-103 Canuck II" (sic)
• C-104/2 Supersonic All-Weather Fighter Proposal