Aviation / Aerospace

Fokker V.4 (Fokker D.VI)

Triplane Fighter Prototype [ 1917 ]

The Fokker V.4 triplane fighter prototype failed to meet company expectations and was eventually delivered to the Austro-Hungarians for formal evaluations.

Authored By: Staff Writer | Last Edited: 07/31/2019 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

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The engineering path to the classic Fokker Dr.I Triplane of World War 1 fame went through several prototype fighters put forth by the company. The entire line was inspired by the arrival of the Sopwith Triplane in late-1916 / early-1917 which became an immediate success for the Allies, offering unparalleled maneuvering capabilities, a high operating ceiling, and excellent rate-of-climb against the slower, heavier-armed Fokker biplanes of the period.

Originally conceived of as a fighting biplane for the government of Austro-Hungary when ordered on May 13th, 1917, the appearance of the Sopwith Triplane saw Fokker revise the type as a fighting triplane complete with the triple-wing configuration (upper, middle, and lower sections being fitted) - thus was born the Fokker V.4.

The wings were set ahead of the cockpit in a staggered fashion and aft of the engine placement which was fitted at the nose. The aircraft's fuselage was slab-sided in its general shape and carried the usual qualities - a fixed, wheeled undercarriage set under the frontal mass of the aircraft, a pair of horizontal tailplanes, and a single (very-well-rounded) vertical tail fin. The engine drove a standard two-bladed wooden propeller at the nose and the pilot sat in an open air cockpit. Power to the aircraft came from a Le Rhone 9-cylinder rotary piston engine developing 120 horsepower.

Interestingly, the triple plane wing configuration relied on a cantilever installation as no interplane struts were fitted for additional support - this differed from the finalized Dr.I triplane fighter still to come. Additionally, the upper wing assembly was of a wider span than the two lower pieces, these being of equal span to one another.

The V.4 achieved its first-flight during May of 1917 which led to balanced ailerons and elevators being fitted for improved controlling. Wing flexing proved an issue during these early flights and "I-type" interplane struts were finally added to the wings. A second prototype V.4 was ordered on July 5th 1917.

As a fighter-minded development, the V.4 was intended to carry 2 x 7.92mm LMG 08/15 series machine guns synchronized to fire through the spinning propeller blades. These were founded ahead of the cockpit and fired over the nose of the aeroplane in the usual way.

As the V.4 suffered from high control forces it was not submitted for formal testing by the German Air Service - instead it was sent to Austrian-Hungarian authorities for review in late-August 1917 while Fokker concentrated on two other triplane designs - the V.5 and V.6 prototypes (the V.5 becoming the direct basis for the Dr.I).

Performance specifications on this page are pure estimates on the part of the author.©MilitaryFactory.com

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Specifications

Service Year

1917

Origin

Imperial Germany

Status

CANCELLED
Development Ended.

Crew

1

Production

1
UNITS

Fokker-Flugzeugwerke - Imperial Germany

(View other Aviaton-Related Manufacturers)

National flag of the Austro-Hungarian Empire

Austria-Hungary (tested); German Empire (not adopted)

(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

18.0 ft
(5.50 m)

Width/Span

23.0 ft
(7.01 m)

Height

9.7 ft
(2.95 m)

Empty Wgt

904 lb
(410 kg)

MTOW

1,235 lb
(560 kg)

Wgt Diff

+331 lb
(+150 kg)

(Showcased structural values pertain to the Fokker V.4 production variant)

Installed: 1 x Le Rhone 9-cylinder rotary piston engine developing 120 horsepower and driving a two-bladed wooden propeller at the nose.

Max Speed

96 mph
(155 kph | 84 kts)

Ceiling

19,029 ft
(5,800 m | 4 mi)

Range

177 mi
(285 km | 528 nm)

Rate-of-Climb

900 ft/min
(274 m/min)

♦ MACH Regime (Sonic)

Sub

Trans

Super

Hyper

HiHyper

ReEntry

♦

(Showcased performance specifications pertain to the Fokker V.4 production variant. Performance specifications showcased above are subject to environmental factors as well as aircraft configuration. Estimates are made when Real Data not available. Compare this aircraft entry against any other in our database or View aircraft by powerplant type)

PROPOSED:
2 x 7.92mm LMG 08/15 machine guns over the nose set to fire through the spinning propeller blades.

Supported Types

Graphical image of an aircraft medium machine gun

(Not all ordnance types may be represented in the showcase above)

Hardpoint Mountings: 0

V.4 - Prototype Model Designation; single example completed.

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