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Koolhoven F.K.55


Single-Seat, Single-Engine Prototype Fighter Aircraft (1938)


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Image from the Public Domain.

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Only one example of the Dutch Koolhoven F.K.55 fighter was ever completed before the program was cancelled in full prior to World War 2.



Authored By: Staff Writer | Last Edited: 05/10/2018 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.
Prior to World War 2 (1939-1945) the Dutch held a respectable aero industry that produced a few notable types of local design. The Koolhoven F.K.55 was a prototype developed along the lines of a high-speed fighter and appeared during the latter half of the 1930s. The line ended with a sole example being built, its first flight held on June 30th, 1938, and the program terminated before the end of the year.

Its design, begun in 1937, was one of a sleek all-modern fighter with the cockpit set forward of the wing mainplanes and the mainplanes shifted just ahead of midships (and shoulder-mounted). Wingtips were rounded and the appendages straight in appearance. The tail unit was conventional with a single fin and a pair of horizontal planes. Construction was mixed, composed of metal and wood. A "tail dragger" undercarriage was featured. The engine of choice became a Lorraine 12Hrs "Petrel" V-12 of 860 horsepower driving a pair of two-bladed propeller assemblies at the nose in contra-rotating fashion. Due to the placement of the cockpit, well forward in the fuselage, the engine was installed aft of the pilot (as in the famous Bell P-39 "AiraCobra" fighter detailed elsewhere on this site).

The completed aircraft was made ready for its first flight in the early part of 1938 and has all of the appearance required of a high-performance aircraft. A fixed undercarriage greeted this monumental moment for the design with the intention that a retractable system be instituted later in development. However, in practice, the design proved lacking in the power necessary for the role - the 860 horsepower produced for the engine was just take-off power. Underpowered and costly to revise, this aircraft endeavor was eventually abandoned by Koolhoven and fell to the pages of military aviation history. Engineers pushed for the installation of a Lorraine "Sterna" supercharged engine of 1,200 horsepower to no avail.

As designed, the F.K.55 sported an maximum speed of 317 miles per hour, a cruising speed nearing 280 miles per hour, a range out to 530 miles and a rate-of-climb of 2,580 feet-per-minute (all figures estimated by Koolhoven). Its proposed armament scheme was to fit a 20mm cannon firing through the propeller hub and 4 x .303 machines guns, two installed in each wing. The P-39 fielded similar armament though a more potent 37mm autocannon in the nose. Its performance was much better as well: a maximum speed of 375 mph was seen in the Q-models. Like the F.K.55, it first flew in 1938 and went on to have a strong war record in the subsequent global conflict.

Specifications



Service Year
1938

Origin
Netherlands national flag graphic
Netherlands

Status
CANCELLED
Development Ended.
Crew
1

Production
1
UNITS


Koolhoven - Netherlands
National flag of the Netherlands Netherlands (cancelled)
(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.
X-Plane (Developmental, Prototype, Technology Demonstrator)
Aircraft developed for the role of prototyping, technology demonstration, or research / data collection.


Length
30.3 ft
(9.25 m)
Width/Span
31.5 ft
(9.60 m)
Height
8.5 ft
(2.60 m)
Empty Wgt
3,527 lb
(1,600 kg)
MTOW
4,850 lb
(2,200 kg)
Wgt Diff
+1,323 lb
(+600 kg)
(Showcased structural values pertain to the base Koolhoven F.K.55 production variant)
Installed: 1 x Lorraine Petrel 12Hrs 12-cylinder Vee engine developing 860 horsepower.
Max Speed
317 mph
(510 kph | 275 kts)
Range
528 mi
(850 km | 1,574 nm)
Rate-of-Climb
2,580 ft/min
(786 m/min)


♦ 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


(Showcased performance specifications pertain to the base Koolhoven F.K.55 production variant. Compare this aircraft entry against any other in our database. View aircraft by powerplant type)
PROPOSED:
1 x 20mm cannon firing through propeller hub
4 x 7.7mm (0.303) machine guns in wings


Supported Types


Graphical image of an aircraft medium machine gun
Graphical image of an aircraft automatic cannon


(Not all ordnance types may be represented in the showcase above)
Hardpoint Mountings: 0


F.K.55 - Base Series Designation; single prototype completed in 1938.


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