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Aviation / Aerospace

AirCo DH.4


Light Day Bomber Biplane Aircraft [ 1917 ]



The Airco DH.4 was produced in nearly 6,300 examples for the Allies and served as a successful day bomber during World War 1.



Authored By: Staff Writer | Last Edited: 10/23/2018 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

VIEW SPECIFICATIONS [+]
With production numbering over 6,000 total units, the AirCo / de Havilland DH.4 was another one of Geoffrey de Havilland's successful aircraft designs of World War 2 (his legacy would later and forever be solidified through the World War 2-era de Havilland DH.98 "Mosquito" fighter-bomber series). The DH.4 was fielded en mass and proved itself a very viable combat platform so much so that the DH.9 - the planned successor to the DH.4 - never unseated the original DH.4 model series. As such, the Dh.4 enjoyed a lasting aerial legacy, achieving success in war time as a principle frontline daytime bomber of the Allies in World War 1 and, in peacetime, serving roles of aerial surveying and crop dusting well into the 1930s.

The DH.4 was designed to meet a War Office specification for a lightweight daytime bomber. Though primarily appearing with the AirCo name, the DH.4 was produced by a variety of sub-contractors throughout England (1,449 total aircraft) and in the United States. U.S. production alone accounted for 4,846 aircraft. British-produced aircraft were fitted with the Rolls-Royce Eagle engine (Eagle III 250hp early and Eagle VIII 375 hp later) whilst American models primarily featured the more powerful Liberty 12 series of 400 horsepower and operated under the United States Army Air Service (USAAS) banner. Despite the use of the Liberty engine, the American model did not feature any notable performance gains when compared to its British counterpart in action - in fact it actually suffered some.

The DH.4 series carried its crew of two in tandem with the pilot placed ahead and the gunner/observer in the rear. The positions were quite separated which hindered communication between the two despite even a "speaking tube" being implemented. The DH.9 series would remedy this by placing the pilot and rear gunner cockpits close to together. The pilot managed one or two x 7.7mm Vickers machine guns in fixed, forward-facing mountings while the rear cockpit was fitted with 2 x 7.62mm Lewis machine guns on a trainable Scarff ring mounting. The DH.4 was cleared to carry up to 460lb of external ordnance (2 x 230lb bombs or 4 x 112lb bombs).

First flight of the DH.4 was recorded during August of 1916 and the aircraft went into service in January of the following year with the British. The DH.4 was taken on by the Americans upon their entry into the war in 1917 with the series being used operationally in 1918. Fisher Body and Dayton-Wright accounted for most of the stateside production of DH.4s. U.S. use went beyond that of the Army Air Service for the DH.4 was also taken on in number by its Navy and Marine Corps showcasing the versatility in its design.

The primary British Air Service (Royal Flying Corps) variant became the standard DH.4 day bomber. In the post-war years, the biplane proved popular in civilian circles where many were modified for various roles. The DH.4A featured a two-passenger cabin aft of the pilot in a glazed over position. The DH.4R was a single-seat racing mount outfitted with the Napier Lion engine of 450 horsepower.

The U.S. took the de Havilland design even further and manufactured a slew of variants from the standard DH.4 day bomber. This included revised models, civilian marks, experimental types, reconnaissance platforms, various engine installations, dual-control trainers, long-range models, etc... The final U.S. Army DH.4s were not retired until 1932.

Australia and Belgium both operated the series in civilian markings. Military operators went on to include Canada, Chile, Cuba, Greece, Iran, Mexico, Nicaragua, New Zealand, South Africa, the Soviet Union, Spain, and Turkey. The Soviets managed a locally-produced copy from the Polikarpov brand during the post-war years.

The DH.4 was a related offshoot of the DH.4 and appeared in 1917 with 4,091 ultimately built. These also found widespread use the world over.©MilitaryFactory.com
Note: The above text is EXCLUSIVE to the site www.MilitaryFactory.com. It is the product of many hours of research and work made possible with the help of contributors, veterans, insiders, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at MilitaryFactory AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.

Specifications



Aircraft Manufacturing Company Ltd (AirCo) / de Havilland - United Kingdom / Dayton-Wright; Fisher Body - USA
Manufacturer(s)
Australia; Belgium; Canada; Chile; Cuba; Greece; Iran; Mexico; Nicaragua; New Zealand; South Africa; Spain; United Kingdom; United States
Operators National flag of Australia National flag of Belgium National flag of Canada National flag of Chile National flag of Cuba National flag of Greece National flag of Iran National flag of Mexico National flag of New Zealand National flag of Nicaragua National flag of South Africa National flag of Spain National flag of the United Kingdom National flag of the United States
1917
Service Year
United Kingdom
National Origin
Retired
Project Status
2
Crew
6,295
Units


GROUND ATTACK
Ability to conduct aerial bombing of ground targets by way of (but not limited to) guns, bombs, missiles, rockets, and the like.
COMMERCIAL AVIATION
Used in roles serving the commercial aviation market, ferrying both passengers and goods over range.
INTELLIGENCE-SURVEILLANCE-RECONNAISSANCE
Surveil ground targets / target areas to assess environmental threat levels, enemy strength, or enemy movement.
TRAINING
Developed ability to be used as a dedicated trainer for student pilots (typically under the supervision of an instructor).


30.7 ft
(9.35 meters)
Length
42.4 ft
(12.92 meters)
Width/Span
11.0 ft
(3.35 meters)
Height
2,392 lb
(1,085 kilograms)
Empty Weight
3,479 lb
(1,578 kilograms)
Maximum Take-Off Weight
+1,087 lb
(+493 kg)
Weight Difference


1 x Rolls-Royce Eagle VIII inline engine developing 375 horsepower driving a two-bladed propeller unit at the nose.
Propulsion
143 mph
(230 kph | 124 knots)
Max Speed
21,998 ft
(6,705 m | 4 miles)
Ceiling
478 miles
(770 km | 416 nm)
Range
1,000 ft/min
(305 m/min)
Rate-of-Climb


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


STANDARD:
1 OR 2 x 7.62mm Vickers machine guns (fixed, forward-firing).
2 x 7.62mm Lewis machine guns on trainable mount in rear cockpit.

OPTIONAL:
Maximum External Bomb Load of 460lb.


2
Hardpoints


DH.4 - Base Series Designationl produced in UK and US.
DH.4A - Civil Passenger Model; seating for two in glazed cabin aft of pilot.
DH.4B - US Air Service model; fitted with Liberty engine; pilot's seat relocated aft of fuel tank and adjacent to rear cockpit.
DH.4 B-1 - Increased Fuel Capacity to 110 US gallons.
DH.4 B-2 - Trainer Variant
DH.4 B-3 - Increased Fuel Capacity to 135 US gallons.
DH.4 B-4 - Civilian Variant
DH.4 B-5 - Experimental Civilian Variant with enclosed cabin area.
DH.4BD - Crop-dusting model based on the DH.4B.
DH.4BG - Specialized variant fitting smoke generators.
DH.4BK - Specialized night flying model.
DH.4BM - Communications Variant; single-seat.
DH.4BM-1 - Dual-control DH.4BM model
DH.4BM-2 - Dual-control DH.4BM model
DH.4BP - Experimental Photo-Reconnaissance Platform.
DH.4BP-1 - Survey Platform
DH.4BS - Developmental Platform fitting a Liberty (supercharged) engine.
DH.4BT - Dual control trainer variant
DH.4BW - Developmental Platform fitting a Wright H engine.
DH.4C - Fitting a Packard engine of 300 horsepower.
DH.4L - Civilian Model
DH.4M - Rebuilt DH.4s utilizing steel tubing for fuselage.
DH.4Amb - Airborne Ambulance
DH.4M-1 (Boeing Model 16) - Post-War Production models; all-new fuselage.
DH.4M-1T - Dual control trainer version of the DH.4M production models.
DH.4M-1K - Target Tug Conversion Models
O2B-1 - US Navy designation of DH.4M-1 models.
O2B-2 - US Navy designation of night-flying/cross-country conversion models.
DH.4M-2 - Atlantic-produced post-war models
LWF J-2 ("Twin DH") - Developmental two-engine, long-range model; fitted with 2 x Hall-Scott-Liberty 6 series engines of 200 horsepower each; 30 examples produced.
DH.4R - Racer Model; single seat; fitted with Napier Lion engine of 450 horsepower.
XCO-7 (Boeing Model 42) - Observation Platform by Boeing with new wings, revised tail fin and split landing gear arrangement.



General Assessment
Firepower  
Performance  
Survivability  
Versatility  
Impact  
Values are derrived from a variety of categories related to the design, overall function, and historical influence of this aircraft in aviation history.
Overall Rating
The overall rating takes into account over 60 individual factors related to this aircraft entry.
92
Rating is out of a possible 100 points.
Relative Maximum Speed
Hi: 150mph
Lo: 75mph
This entry's maximum listed speed (143mph).

Graph average of 113 miles-per-hour.
City-to-City Ranges
NYC
 
  LON
LON
 
  PAR
PAR
 
  BER
BER
 
  MOS
MOS
 
  TOK
TOK
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Operational range when compared to distances between major cities (in KM).
Max Altitude Visualization
Small airplane graphic
Design Balance
The three qualities reflected above are altitude, speed, and range.
Aviation Era Span
Pie graph section
Pie graph section
Showcasing era cross-over of this aircraft design.
Unit Production (6,295)
6295
36183
44000
Compared against Ilyushin IL-2 (military) and Cessna 172 (civilian).
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Images



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Image of the AirCo DH.4
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Image of the AirCo DH.4
Front left side view of the Airco DH.4 light bomber; color
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Image of the AirCo DH.4
Front right side view of the Airco DH.4 light bomber; color
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Image of the AirCo DH.4
Front right side view of the Airco DH.4 bomber on display; color
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Image of the AirCo DH.4
Front left side view of the Airco DH.4 bomber on display; color
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Image of the AirCo DH.4
Close-up detail view of the forward fuselage of an Airco DH.4 light bomber; note Marlin machine guns in rear cockpit
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Image of the AirCo DH.4
Clsoe-up detail view of the bombsight made available to the crew of an Airco DH.4 light bomber
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Image of the AirCo DH.4
Rear left side view of a modified air ambulance version of the Airco DH.4; note enclosed cabin
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Image of the AirCo DH.4
Front left side view of an Airco DH.4 at rest; note four-bladed propeller
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Image of the AirCo DH.4
A line of Airco DH.4 light bombers at the ready

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