In the pre-World War 2 world, engineers at Curtiss-Wright began work on an export-minded, single-seat, single-engine fighter-interceptor influenced by the company's previous twin-seat "Model 19" utility aircraft. Performance was to be the key quality of the lightweight design - particularly in its rate-of-climb - affording the pilot the ability to take-off and meet incoming bomber formations in short order and escape potential fighter-versus-fighter dueling if pressed . The aircraft was christened "Model 21" and took on the formal designation of CW-21 "Demon" in sales.
The aircraft was given a typical configuration for the period with its low-set monoplane wings. Metal was incorporated throughout its construction. The radial piston engine, driving a three-blade propeller unit, was fitted to a forward compartment. The pilot sat in a cockpit at amidships looking down the rather long nose assembly. There was a raised fuselage spine aft of the cockpit to incorporate the needed internal volume but this also limited rearward visibility. The cockpit was covered in a framed canopy with decent views of the surrounding area - again limited by the spine, the long nose and the monoplane wings underneath. The fuselage tapered at the rear in the usual way, the tail capped by a small-area rounded vertical fin and low-set horizontal tailplanes. The undercarriage was of the "tail-dragger" configuration that included two main legs under the wings and a small tail wheel. All three systems were retractable into the design with the main legs retracting into underwing fairings. Power was served through a Wright R-1820-G5 9-cylinder, air-cooled radial piston engine of 1,000 horsepower and performance from this was as expected - a maximum speed of 315 miles per hour with a strong rate-of-climb.
The aircraft was to be armed with a combination machine gun arrangement. When first flown on September 22nd, 1938, it was fitted with 1 x 0.50 caliber heavy machine gun and 1 x 0.30 caliber medium machine gun in the engine cowling. Conversely, a customer could accept a fighter with 2 x 0.50 machine guns or 2 x 0.30 machine guns as needed. In any case, both machine gun mounts were synchronized to fire through the spinning propeller blades which limited their rate-of-fire but lightened wing loads.
Of mention here is the decision by Curtiss-Wright to delete several key life-saving qualities from the design to maintain its impressive lightweight stature and performance. The aircraft lacked cockpit armoring and self-sealing fuel tanks - two qualities that would become commonplace for any World War 2 classic fighter design. Armament was deliberately lightweight which limited the aircraft's offensive "punch" and overall construction was not as robust as required of a military fighter.
The three evaluation models arrived in May of 1940. It proved something of an omen for the seires when all four of the early acquired birds (prototype included) were lost in crashes. The twenty-seven-strong order never materialized for the Japanese expansion soon neutralized the expected production facility. As such, the CW-21 Demon was not used in anger by the Chinese during their war with Japan.
Despite the setback, Curtiss-Wright continued development of their product. Changes to the undercarriage (now recessing flush with the wing line) and flaps (now hydraulically-operated) followed which produced a slightly heavier airframe with a decreased rate-of-climb but still managing approximately the same maximum speed (314mph). The original Wright powerplant was retained and armament was 4 x 0.30 caliber medium machine guns. There proved enough changes to the design to warrant the variant designation of "CW-21B".
Twenty-four of the B-models were sold to the Netherlands Army in April 1940. However, the nation capitulated to Germany the following month and this forced the order to the Dutch East Indies instead. While managing to score a few kills against the Japanese, the CW-21Bs proved fodder for the more skilled and battle-hardened Japanese aviators. The lack of self-sealing fuel tanks led to airframes catching fire or exploding outright when hit and no cockpit armoring exposed the pilot to lethal dangers. Standard light armament meant that the aircraft could do little against heavier Japanese designs and the airframes were fragile with some aircraft grounded due to fractures. The only category the CW-21B shined in was rate-of-climb - but this proved of little value to the faltering Dutch forces. The aircraft was also remembered for its terrible landing qualities - partially due to the long nose assembly.
Such was the reign of the CW-21 that only 62 total examples emerged in all (including B-models). A two-seat version was revealed by Curtiss-Wright as the CW-22 in time and this aircraft, again, managed a limited armament arrangement of 1 x 0.30 in a fixed, forward-firing position with a 0.30 gun on a trainable mount in the rear cockpit. The cockpits both sat under a long, greenhouse -style canopy with generally good views.
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Specifications
Curtiss-Wright Corporation - USA Manufacturer(s)
Australia; China; Netherlands; United States Operators
AIR-TO-AIR COMBAT
General ability to actively engage other aircraft of similar form and function, typically through guns, missiles, and/or aerial rockets.
INTERCEPTION
Ability to intercept inbound aerial threats by way of high-performance, typically speed and rate-of-climb.
27.2 ft (8.29 meters) Length
35.0 ft (10.66 meters) Width/Span
8.2 ft (2.50 meters) Height
3,384 lb (1,535 kilograms) Empty Weight
4,497 lb (2,040 kilograms) Maximum Take-Off Weight
Variable:
1 x 0.30 caliber medium machine gun with 1 x 0.50 caliber heavy machine gun in nose
2 x 0.30 caliber machine guns in nose
2 x 0.50 caliber machine guns in nose
4 x 0.30 caliber machine guns in nose
0 Hardpoints
CW-21 "Demon" - Base Series Designation; original model with underwing landing gear fairings.
Model 21 - Company Designation
CW-21B - Improved CW-21 with revised flush undercarriage; hydraulically-powered flaps.
CW-22 - Two-seat variant based on the CW-21
CW-22B - Export Designation to Turkey
SNC-1 "Falcon" - US Navy designation of CW-22; used as trainer.
Images
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Front right side view of the Curtiss-Wright CW-21 Demon at rest; Public Domain image.
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