While the earlier FVM J23 single-seat, single-engined parasol-winged fighter prototype failed due to a structural weakness with its wing mainplane member, this did not spell total doom for the basic design. At the same time, FVM was working on the J24 of similar form and function - save for a return to a traditional biplane wing arrangement as was common to the post-World War 1 period. Despite the change, however, this design, too, failed to impress and gave a poor showing in competition - losing out to the French-originated Nieuport 29C biplane fighter for the Swedish Army requirement.
Beyond the addition of the lower wing member, and its associated strut and cabling components, the J24 housed a more powerful Hispano-Suiza 8F series V8 water-cooled inline piston engine of 300 horsepower (as opposed to the J23's 185 horsepower BMW IIIa inline). The fighter retained the single-seat, single-engine layout with the pilot sitting in an open-air cockpit aft and under the upper wing member. Over the nose was to be seated 2 x 8mm m/22 machine guns synchronized to fire through the spinning propeller blades. As was typical of the time, the fuselage was tapered towards the rear, utilized a single-finned rudder tail, and had a fixed, twin-wheeled tail-dragger undercarriage for ground-running - by all accounts a most traditional fighter proposal.
Work on the J24 in 1924 resulted in the finalized J24B form which was flight-tested in 1925. However, the reworked design carried its own deficiencies, mainly in being overweight which resulted in poor performance when compared to contemporaries. This led to the end of the J24 series and the selection of the French Nieuport 29C instead.
The sole J24 prototype was scrapped thereafter.
The finalized form of the J24 was 22.7 feet long, had a wingspan measuring 36.10 feet, and a height of 8.4 feet. Empty weight was 1,700lb against an MTOW of 2,175lb. The single BMW IIIa series engine provided the fighter with a maximum speed of 122 miles-per-hour and a service ceiling of 26,000 feet.
(OPERATORS list includes past, present, and future operators when applicable)
✓Air-to-Air Combat, Fighter
General ability to actively engage other aircraft of similar form and function, typically through guns, missiles, and/or aerial rockets.
Ability to intercept inbound aerial threats by way of high-performance, typically speed and rate-of-climb.
✓X-Plane (Developmental, Prototype, Technology Demonstrator)
Aircraft developed for the role of prototyping, technology demonstration, or research / data collection.
22.6 ft (6.90 m)
36.9 ft (11.25 m)
8.4 ft (2.55 m)
1,698 lb (770 kg)
2,172 lb (985 kg)
+474 lb (+215 kg)
(Showcased structural values pertain to the FVM J24B production variant)
1 x Mercedes IIIa 6-cylinder inline piston engine developing 185 horsepower driving two-bladed propeller unit at the nose.
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