Hafeli DH-3

Twin-Seat Armed Reconnaissance Biplane

Switzerland | 1917

"The Hafeli DH-3 armed biplane scout was the natural follow-up to the DH-2 - improving in most aspects of the earlier design."

Authored By: Staff Writer | Last Edited: 09/14/2021 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.

Image from the Swiss Federal Archive; Public Domain.

The Hafeli DH-3 of 1917 was the logical follow-up to August Hafeli's work on the preceding twin-boom DH-1 biplane and conventionally-arranged DH-2 biplane reconnaissance platforms for the Swiss Air Force (both detailed elsewhere on this site). Neither was an outright success and served beyond Swiss borders for their time but laid the ground work for the DH-3 and others to follow. The resulting design saw more widespread use with serial production across three major variants reaching 110 units in all.

Like the earlier entries, the DH-3 utilized a twin-seat, open-air cockpit arrangement and over-under biplane wing configuration. The engine was sat at the nose in the usual way and the mainplanes were given twin bays with parallel struts. A simple fixed, twin-wheeled undercarriage with tailskid was used for ground-running. For all intents and purposes, the DH-3 was drawn up as an improved form of the earlier DH-2 and used the same configuration, materials (fabric over wood), and arrangement. Changes included a new cut-out portion of the upper wing member for improved viewing from the cockpit as well as enhanced firing arcs for the machine gunner.

Like other Hafeli designs, the DH-3 carried an Argus As II series developing 120 horsepower driving a two-bladed, fixed-pitch wooden propeller at the nose.

Dimensions included a running length of 26 feet, a wingspan of 41 feet, and a height of 10 feet. Empty weight reached 2,500lb against an MTOW of 3,500. Performance specs included a maximum speed of 90 miles-per-hour, a range out to 250 miles, and a service ceiling of 14,800 feet. Armament was a single 7.45mm machine gun on a trainable mounting at the observer's / gunner's cockpit.

At least twenty-four first-run production models were built to the stated DH-3 standard. However, engine issues and problems related to the undercarriage forced a revision to the extent that the series was given a new variant, the DH-3a of 1919.

These further improved models now carried the imported Hispano-Suiza HS-41 8Aa V-8 water-cooled engine of 150 horsepower and appeared in four initial contracted units. Then followed another thirty examples in 1919, these with locally-built, licensed engines. Beyond this were forty-nine additional airframes to arrive in 1925. In 1932, the series was modified again, this time at their mainplane members, to carry Handley Page slats. In all, 83 DH-3a aircraft were produced, making them the definitive offering of the line.

The DH-3b were three biplanes of 1918 outfitted with the LFW 0 series engine of 150 horsepower.

In both production totals and performance capabilities, the DH-3 was a success when compared to the earlier DH-1 and DH-2 types and flew into 1939, the year to see the start of World War 2 (1939-1945). The DH-4, sharing much with the DH-3 save for its two-man crew and synchronized, forward-firing machine gun, naturally followed in the early part of 1918 but only existed as a single prototype for its time in the air.

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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 Hafeli DH-3 Twin-Seat Armed Reconnaissance Biplane.

EARLY: 1 x Argus As II liquid-cooled inline piston engine developing 120 horsepower driving two-bladed, fixed-pitch propeller at the nose. LATE: 1 x Hispano-Suiza 8Aa V-8 liquid-cooled inline piston engine developing 150 horsepower driving two-bladed propeller at the nose.
Propulsion

90 mph
145 kph | 78 kts
Max Speed

75 mph
120 kph | 65 kts
Cruise Speed

14,764 ft
4,500 m | 3 miles
Service Ceiling

249 miles
400 km | 216 nm
Operational Range

City-to-City Ranges
Operational range when compared to distances between major cities (in KM).

NYC

LON

PAR

BER

MOS

TOK

SYD

LAX

NYC

Structure
The nose-to-tail, wingtip-to-wingtip physical qualities of the Hafeli DH-3 Twin-Seat Armed Reconnaissance Biplane.

2
(MANNED)
Crew

26.1 ft
7.95 m
O/A Length

41.0 ft
(12.50 m)
O/A Width

10.2 ft
(3.10 m)
O/A Height

2,447 lb
(1,110 kg)
Empty Weight

3,527 lb
(1,600 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 Hafeli DH-3 Twin-Seat Armed Reconnaissance Biplane .

1 x 7.45mm machine gun on trainable mounting at observer's / gunner's cockpit.

Variants
Notable series variants as part of the Hafeli DH-3 family line.

Operators
Global customers who have evaluated and/or operated the Hafeli DH-3. Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 110 Units
Contractor(s): Eidgenossische Konstruktionswerkstaette (K+W) / Hafeli - Swtizerland

[ Switzerland ]

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Image from the Swiss Federal Archive; Public Domain.

Similar
Developments of similar form-and-function, or related, to the Hafeli DH-3 Twin-Seat Armed Reconnaissance Biplane.

Hafeli DH-4

Going Further...
The Hafeli DH-3 Twin-Seat Armed Reconnaissance Biplane appears in the following collections:

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