MANUFACTURER(S): Fokker - Netherlands
OPERATORS: Netherlands (cancelled)
LENGTH: 33.46 feet (10.2 meters)
WIDTH: 37.73 feet (11.5 meters)
HEIGHT: 12.47 feet (3.8 meters)
WEIGHT (EMPTY): 4,806 pounds (2,180 kilograms)
WEIGHT (MTOW): 6,504 pounds (2,950 kilograms)
ENGINE: 2 x Walter Sagitta I-SR air-cooled radial piston engines developing 530 horsepower each and driving three-bladed propeller units.
SPEED (MAX): 326 miles-per-hour (525 kilometers-per-hour; 283 knots)
RANGE: 522 miles (840 kilometers; 454 nautical miles)
CEILING: 29,528 feet (9,000 meters; 5.59 miles)
Detailing the development and operational history of the Fokker D.XXIII Twin-Engine, Single-Seat Fighter Prototype Aircraft.
Entry last updated on 5/15/2018.
Authored by Staff Writer. Content ©www.MilitaryFactory.com.
One of the inherent issues of flying single-engined, propeller-driven fighter-type aircraft of the 1930s was the natural "pull" of the airframe to one side or the other due to torque (caused by the spinning motion of the propeller blades). The pilot was typically forced to manually compensate for this and only the addition of a second engine to help offset this pulling action was found as the best solution. In The Netherlands, just prior to World War 2 (1939-1945), Marius Beeling was at work on a new type of single-seat, twin-engine fighter design which attempted to remedy this issue in a different way - by having both engines seated in tandem along the fuselage, one arranged to "pull" the aircraft through the skies and the other arranged to "push" it.
The resulting aircraft was the Fokker D.XXIII which flew for the first time in prototype form on May 30th, 1939. Its general shape involved a center-set fuselage "pod" containing both engines as well as the cockpit and avionics. To this was added a wing mainplane fitted under the fuselage and extending out straight with rounded wingtips. From each wing leading edge originated tail booms which extended to the rear of the aircraft. These appendages were then joined by a shared horizontal stabilizer and this horizontal plane was straddled at either end by small-area, rounded vertical fins. A rather modern tricycle undercarriage, fully retractable, was fitted for ground running.
As tested, the aircraft was powered through 2 x Walter Sagitta I-SR 12-cylinder air-cooled piston engines developing 530 horsepower each and driving three-bladed propeller units fore and aft of the fuselage. Listed specs included a maximum speed of 326 miles per hour, a range out to 522 miles and a service ceiling of 30,000 feet.
Proposed armament became 2 x 13.2mm heavy machine guns and 2 x 7.9mm medium machine guns.
Of seemingly sound design, good overall performance and generally well-armed for its time, the D.XXIII was a promising single-seat fighter heading into the wartime period.
To move the test phase along the prototype was completed with thick wooden wing mainplanes whereas the production-quality fighter was to feature all-metal construction. Tested indicated overheating issues with the rear-mounted air-cooled engine which was natural given its placement within the fuselage (and lack of direct air flow). Only about four hours of testing were had on this Dutch fighter prototype before the German invasion of May 1940 ended all hope for its contribution in the defense of The Netherlands. The program was not resurrected during the war nor in the post-war period leaving the D.XXIII as nothing more than a footnote in World War 2 aviation.
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Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.
Relative Maximum Speed Rating
This entry's maximum listed speed (326mph).
Graph average of 300 miles-per-hour.
Graph showcases the Fokker D.XXIII's operational range (on internal fuel) when compared to distances between major cities.
Useful in showcasing the era cross-over of particular aircraft/aerospace designs.
Unit Production Comparison
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units