Canadair CL-43 and CL-204 STOL and early CL-215 development


All hail the God of Frustration!!!
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15 April 2006
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Hi folks,

During the development of any new aircraft there are a number of developments that don't make it to the final product. Here are 2 early configurations studied during the evolution of the CL-215:




Hi all,

in the article by air enthusiast about the Canadair story I found a pic from the C.L.204, a forrunner of the C.L.215, but without technical data. Anybody of you have some of these?
A early design of the C.L.204 was the C.L.43, do you have a pic or drawing with technical data?

Servus Maveric
Hi ,

a little info about CL-84 pre-designs were here;,709.0.html

Attached is a Bombardier image of the Canadair CL-204 concept.


"Benefiting from its experience in the construction of 369 Canso aircraft under license, management seized the opportunity of developing the CL-204 model as a waterbomber.

The results of a survey of U.S. and Canadian clients favored a medium-sized twin-engined amphibious aircraft, with a carrying capacity of 2,700 to 5,900 litres. An initial sketch showed a high-wing hulled aircraft with a T-tail, and this basic plan was presented in model form at the 1965 Paris Air Show."

But, as can be seen in the photo, the model was of a twin-float, twin-boom machine. Obviously an early concept before moving on to the amphibious flying boat concept.

The CL-43 was described as "a twin-engined logistic supply aircraft"


No further details are given but it is easy to imagine an Arava-like design leading to the initial float-equipped CL-204 concept.


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I've just unpacked my copy of Ken Molson's Canadian Aircraft since 1909. In Appendix 4, he lists the CL-204 as a "Firefighting amphibious floatplane, 1963. Two 2,100hp Pratt & Whitney R-2800s."

There is no mention of the CL-43 but the CL-42 (a 1953 executive a/c) is also R2800 powered. I'm not sure if the '42 and '43 might be related designs.
Attached is a side view of an early conception of Canadair's CL-215 waterbomber.

Noticable differences from the finalized design are the 'T' tail, raised cockpit, engines (and short nacelle tails), and details of the undercarriage. The forward chine extensions had not appeared yet and the tip floats are of different shape and somewhat smaller.

Inset are a scrap view of the earliest tail configuration (a braced slab 'T') and Canadair artwork of that same earliest concept. The latter (and inspiration) courtesy of boxkite.

[ps: the registration is a bit of nonsense. The prototype CL-215 was CF-FEU-X.]


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Source: Flying Review International - May 1966


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My dear GTX,

the bottom drawing is for CL-204.
Thanks Hesham. I hadn't realized that the early CL215 studies ever featured the final, cruciform tail.

The CL-43 STOL aircraft design proposal of early 1954 was among the first early V/STOL aircraft configurations conceived, and seriously studied, by engineers and designers at Canadair Limited.

The initial design study of this dual-engined, twin-boom, Logistics Supply aircraft, with automatic leading edge slats and full span double slotted flaps, revealed the importance of interconnected large diameter propellers for attainment of good STOL performance. These features would permit the CL-43 to clear a 15.2 m (50.0 ft) obstacle within 260 m (850 ft) following takeoff, and were paramount in the future development of the subsequent Canadair tilt-wing V/STOL, and later, CL-204 and CL-215 amphibious aircraft design efforts.

Conceived for use as basic air transportation in the north – a role to be assumed successfully later by the de Havilland Canada DHC-6 Twin Otter, the CL-43 aircraft was originally offered in a basic land plane configuration. It was to be readily convertible to either float plane or ski plane variants in order to perform its primary role of logistical support. In a secondary role, it was proposed for use as an air ambulance, personnel, paratroop, or vehicle transport.

Approximating the size of the venerable Douglas DC-3, this new aircraft design, as offered, could not possibly meet the low cost of readily available, war surplus, Douglas C-47 military transports, then flooding the market and being converted - over 400 by Canadair alone - to fill the needs of commercial airlines. In the face of such a daunting marketing obstacle the design of the CL-43 was soon shelved.

CL-43 Specifications:
Power was supplied by two 600 horsepower Pratt & Whitney (P&W) Wasp R-1340 engines driving 3.6 m (12.0 ft) diameter Hamilton Standard 3-bladed propellers. The CL-43 had a projected wingspan of 25.9 m (85.0 ft), height of 4.6 m (15.0 ft), length of 15.0 m (49.25 ft), and approximate gross weight of 6,804 kg (15,000 lbs).

An alternative proposed powerplant configuration employed the use of shrouded propellers. Adjustable exhaust ducts would divert the airflow over the flaps and tail control surfaces, thereby permitting additional lift and control during low speed STOL handling.


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A larger version of an image previously posted in this thread:


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A few period advertisements...


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