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FVM J23


Parasol Wing Monoplane Fighter Prototype


Sweden | 1923



"Just five prototypes were completed of the Swedish FVM J23 fighter in the Interwar period - the series doomed to a fatal wing failing."



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.
The FVM J23 was a single-seat, single-engine fighter development originating from Sweden's Flygcompaniets Verkstader at Maimen (FVM). Its design is attributed to engineers Henry Kjellson and Ivar Malmar. Work on the fighter began in 1922 but a structural deficiency largely doomed the program in the long term and just a handful of examples were completed before the end.

The J23 was of largely conventional design concerning post-World War 1 fighters save for its high-mounted "parasol" wing mainplane. It fitted its engine in the nose in the usual way and sat the single pilot in an open-air cockpit over midships. The high-mounted nature of the mainplane allowed the pilot to see over and under the member, improving basic vision out-of-the-cockpit. This was further enhanced by a section of the member's trailing edge being cut out to better serve the pilot. Beyond this, the aircraft relied on a smooth, tapering fuselage, fixed tail-dragger undercarriage, and single-finned tail unit. Wooden construction was used throughout.

Dimensions included a length of 22.7 feet, wingspan of 36.10 feet, and height of 8.3 feet. Empty weight reached 1,700lb against a Maximum Take-Off Weight (MTOW) of 2,175lb.

Power was from a BMW IIIa 6-cylinder inline piston engine developing 185 horsepower and used to drive a two-bladed propeller unit at the nose in traditional tractor fashion. Performance specs ultimately included a maximum speed of 122 miles-per-hour, a service ceiling of 26,000 feet, and a climb rate nearing 1,063 feet-per-minute.

Standard armament was 2 x 8mm m/22 series machine guns, these synchronized to fire through the spinning propeller blades. While seemingly modest, the twin-gun arrangement was a long-running standard for fighter aircraft of the post-war period.

The project eventually yielded five flyable prototypes. In 1923, they were each featured in the International Air Exhibition at Gothenburg and were extensively flight-tested into March of the following year. It was at this point in the program that a failure of the mainplane caused one of the test pilots to be killed (Axel Norberg) in an accident. The incident forever damaged the program and interest in the dangerous aircraft soon fell to naught despite modifications made to the structure to rectify the weakness.

With damage to the program all but done, the J23 was abandoned in full and all participating airframes were subsequently destroyed. The follow-up FVM J24/J24B became a promising offshoot of the J23, though now fitted with a more traditional biplane wing arrangement deemed safer by Swedish military authorities as well as a more powerful engine. This sole prototype was beaten out in competition by the French Nieuport 29C biplane namely due to lackluster performance.

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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 J23 Parasol Wing Monoplane Fighter Prototype.
1 x BMW IIIa 6-cylinder inline piston engine developing 185 horsepower driving a two-bladed propeller unit at the nose.
Propulsion
122 mph
197 kph | 106 kts
Max Speed
26,247 ft
8,000 m | 5 miles
Service Ceiling
1,065 ft/min
325 m/min
Rate-of-Climb
Structure
The nose-to-tail, wingtip-to-wingtip physical qualities of the FVM J23 Parasol Wing Monoplane 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
Armament
Available supported armament and special-mission equipment featured in the design of the FVM J23 Parasol Wing Monoplane Fighter Prototype .
2 x 8mm m/22 machine guns over the nose in fixed, forward-firing mountings synchronized to fire through the spinning propeller blades.
Variants
Notable series variants as part of the FVM J23 family line.
J23 - Base Series Designation; five flyable prototypes completed before project's end.
Operators
Global customers who have evaluated and/or operated the FVM J23. Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 5 Units

Contractor(s): Flygcompaniets Verkstader at Maimen (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
5
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
WWI
Interwar
WWII
ColdWar
Postwar
Modern
Future
1 / 1
Image of the FVM J23
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
CLOSE-AIR SUPPORT
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 J23 Parasol Wing Monoplane Fighter Prototype.
Going Further...
The FVM J23 Parasol Wing Monoplane Fighter Prototype appears in the following collections:
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