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FVM J24


Single-Seat, Single-Engine Biplane Fighter Prototype


Sweden | 1925



"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: 10/07/2020 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
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.

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Power & Performance
Those special qualities that separate one aircraft design from another. Performance specifications presented assume optimal operating conditions for the FVM J24B Single-Seat, Single-Engine Biplane Fighter Prototype.
1 x Mercedes IIIa 6-cylinder inline piston engine developing 185 horsepower driving two-bladed propeller unit at the nose.
Propulsion
122 mph
197 kph | 106 kts
Max Speed
20,013 ft
6,100 m | 4 miles
Service Ceiling
351 miles
565 km | 305 nm
Operational Range
1,060 ft/min
323 m/min
Rate-of-Climb
City-to-City Ranges
Operational range when compared to distances between major cities (in KM).
NYC
 
  LON
LON
 
  PAR
PAR
 
  BER
BER
 
  MOS
MOS
 
  TOK
TOK
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Structure
The nose-to-tail, wingtip-to-wingtip physical qualities of the FVM J24B Single-Seat, Single-Engine Biplane Fighter Prototype.
1
(MANNED)
Crew
22.6 ft
6.90 m
O/A Length
36.9 ft
(11.25 m)
O/A Width
8.4 ft
(2.55 m)
O/A Height
1,698 lb
(770 kg)
Empty Weight
2,172 lb
(985 kg)
MTOW
Design Balance
The three qualities reflected below are altitude, speed, and range. The more full the box, the more balanced the design.
RANGE
ALT
SPEED
Armament
Available supported armament and special-mission equipment featured in the design of the FVM J24 Single-Seat, Single-Engine Biplane Fighter Prototype .
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.
Variants
Notable series variants as part of the FVM J24 family line.
J24 - Base Series Designation.
J24B - Refined / finalized biplane fighter form; single, flyable example completed and tested.
Operators
Global customers who have evaluated and/or operated the FVM J24. Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 1 Units

Contractor(s): FVM - Sweden
National flag of Sweden

[ Sweden (cancelled) ]
Relative Max Speed
Hi: 150mph
Lo: 75mph
Aircraft Max Listed Speed (122mph).

Graph Average of 113 MPH.
Era Crossover
Pie graph section
Showcasing Aircraft Era Crossover (if any)
Max Alt Visualization
Small airplane graphic
Production Comparison
1
36183
44000
Entry compared against Ilyushin IL-2 (military) and Cessna 172 (civilian) total production.
MACH Regime (Sonic)
Sub
Trans
Super
Hyper
HiHyper
ReEntry
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030
Aviation Timeline
EarlyYrs
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WWII
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Future
1 / 1
Image of the FVM J24
Image from the Public Domain.

Mission Roles
Some designs are single-minded in their approach while others offer a more versatile solution to airborne requirements.
AIR-TO-AIR COMBAT
INTERCEPTION
X-PLANE
Recognition
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Similar
Developments of similar form-and-function, or related, to the FVM J24 Single-Seat, Single-Engine Biplane Fighter Prototype.
Going Further...
The FVM J24 Single-Seat, Single-Engine Biplane Fighter Prototype appears in the following collections:
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