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FVM J24


Single-Seat, Single-Engine Biplane Fighter Prototype


Aviation / Aerospace

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Image from the Public Domain.

Like the J23 monoplane before it, the FVM J24 biplane failed to impress and fell to the pages of aviation history for the nation of Sweden.



Authored By: Staff Writer | Last Edited: 10/7/2020 | Content ©www.MilitaryFactory.com
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.


Specifications



Year:
1925
Status
Cancelled
Crew
1
[ 1 Units ] :
FVM - Sweden
National flag of Sweden Sweden (cancelled)
- Fighter
- Interception
- X-Plane / Developmental
Length:
22.64 ft (6.9 m)
Width:
36.91 ft (11.25 m)
Height:
8.37 ft (2.55 m)
(Showcased structural dimension values pertain to the FVM J24B production model)
Empty Weight:
1,698 lb (770 kg)
MTOW:
2,172 lb (985 kg)
(Diff: +474lb)
(Showcased weight values pertain to the FVM J24B production model)
1 x Mercedes IIIa 6-cylinder inline piston engine developing 185 horsepower driving two-bladed propeller unit at the nose.
(Showcased powerplant information pertains to the FVM J24B production model)
Max Speed:
122 mph (197 kph; 106 kts)
Service Ceiling:
20,013 feet (6,100 m; 3.79 miles)
Max Range:
351 miles (565 km; 305 nm)
Rate-of-Climb:
1,060 ft/min (323 m/min)
(Showcased performance values pertain to the FVM J24B production model; Compare this aircraft entry against any other in our database)
PROPOSED:
2 x 8mm m/22 machine guns in fixed, forward-firing mountings over the nose and synchronized to fire through the spinning propeller blades.
(Showcased armament details pertain to the FVM J24B production model)
J24 - Base Series Designation.
J24B - Refined / finalized biplane fighter form; single, flyable example completed and tested.
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