U.S. Air Service




AIRCRAFT


OF THE


A E F



DH-9A


DH-9A In Operation During Russian Civil War


Development and Operation

Soon after the appearance of the British D.H. 9 long-range bomber was made the deficiencies of the aircraft became evident. When the Americans announced the development of the Liberty engine the British decided to modify the D.H. 9 to incorporate the new engine. This necessitated the incorporation of a strengthened fuselage to handle the heavier engine plus new main planes in increased span and chord. Also, a new radiator design was incorporated. The new design was designated as the D.H. 9A. The first modified aircraft was ready for flight in early 1918, but the Liberty engine was not. Therefore, the first flight, which occurred in March of 1918, flew with the Rolls-Royce Eagle VIII engine. The Liberty engined flight did not occur until 19 April 1918. The ordnance carried by the aircraft consisted of one fixed 0.303 in Vickers machine gun, synchronized by a Constantinsco CC Gear for the pilot and one 0.303 in Vickers machine gun on a Scarff ring for the Observer. The bomb load was six 60 lb. bombs.

About this time the First Marine Aviation Force of the Navy's Northern Bombing Group was short of aircraft and was borrowing or using RAF machines on their missions. The situation was that the Marines had a surplus of Liberty engines but no aircraft while the RAF had a surplus of aircraft, but no engines. Therefore, an agreement was reached whereby three Liberty engines would be exchanged for one D.H. 9A fuselage. By the end of the war some 20 D.H. 9A's were with the Marines; out of a total of some 57 D.H. 9A's transferred by the British to the Navy

 

Aircraft and Flight Characteristics
[Powered by the Liberty V-12 engine and carrying two 230-lb bombs]

Weight

 

Empty

2800 lbs.

Military Load

500 lbs.

Crew

360 lbs.

Fuel and Oil

905 lbs.

Loaded

4645 lbs.

Maximum Speed

 

Ground Level

123 mph

10,000 ft.

114.5 mph

15,000 ft.

106 mph

16,500 ft.

102 mph

Climb

 

2,000 ft.

2 min. 20 sec.

5,000 ft.

6 min. 25 sec.

6,000 ft.

8 min 55 sec

10,000 ft.

15 min. 45 sec..

15,000 ft.

33 min.

16,500 ft.

43 min. 50 sec.

Endurance

5 hrs.

Ceiling

 

Service

16,750 ft.

Absolute

18,000 ft.


References:


1. British Aeroplanes, 1914-1918
by J.M. Bruce

2. De Haviland Aircraft of World War One
by J.M. Bruce

1. Profile Publication No. 248
by Chaz Bowyer

4. Photo from the Author's collection.


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