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Avro 504

The Avro 504 was a First World War biplane aircraft made by the Avro aircraft company and under licence by others.

Production during the war totalled 8,970 and continued for almost 20 years, making it the most-produced aircraft of any kind that served in any military capacity during the First World War.

More than 10,000 were built from 1913 until production ended in 1932.



80 hp (60 kW) Gnome Lambda engine, Original model


Modified with smaller ailerons and broader struts. 80 hp (60 kW) Gnome engine.


Version for RNAS with larger fin & 80 hp (60 kW) Gnome or Le Rhône engine.


Single seat anti-zeppelin aircraft for the RNAS.

The 504C was fitted with an extra fuel tank, in place of the observer.


Single-seat anti-zeppelin aircraft for the Royal Flying Corps, Six built.


100 hp (75 kW) Gnome Monosoupape engine, Ten built.


75 hp (56 kW) Rolls-Royce Hawk engine, One built.


80 hp (60 kW) Gnome engine.


Used for catapult trials, 80 hp (60 kW) Gnome engine.


Used as a trainer.

100 hp (75 kW) Gnome or 80 hp (60 kW) Le Rhône engine.


Two-seat training aircraft.

The 504K had a universal mount to take different engines.

Single seat fighter conversion used for anti-zeppelin work.

Several were assembled in Australia by Australian Aircraft & Engineering.

Powered by the 130 hp (97 kW) Clerget 9B,

100 hp (75 kW) Gnome Monosoupape


110 hp (82 kW) Le Rhône 9J engines.

504K Mk.II 

Hybrid trainer based on 504K fuselage with 504N undercarriage and wings and powered by rotary engine.

Built under licence in Mexico as Avro Anahuac.


Floatplane version.

150 hp (110 kW) Bentley BR1, 130 hp (97 kW) Clerget or 110 hp (82 kW) Le Rhône engines.


Three-seat cabin biplane.

Only one was ever built, 100 hp (75 kW) Gnome engine.


Two-seat training aircraft.

Redesigned postwar trainer for RAF with 160 hp (120 kW) Armstrong Siddeley Lynx engine, 598 built.


Floatplane version of 504N.

First aircraft to fly above the Arctic Circle in 1923 Oxford Expedition.


Three-seat cabin biplane.

The 504Q was built for the Oxford University Arctic Expedition.

Only one was ever built, powered by an Armstrong Siddeley Lynx engine.

504R Gosport 

Reworked trainer with revised, lightweight structure.

Five prototypes flown 1926 to 1927 with various engines (100 hp/75 kW Gnome Monosoupape, 100 hp/75 kW) Avro Alpha, (140 hp/104 kW) Armstrong Siddeley Genet Major and (150 hp/110 kW) Armstrong Siddeley Mongoose), with the Mongoose chosen for production aircraft.

Ten were sold to Argentina, with 100 more built by FMA under licence in Argentina.

Twelve were exported to Estonia, remaining in service until 1940, and an unknown number to Peru.


Two-seat training aircraft, Built under licence in Japan by Nakajima.

Yokosuka K2Y1 

Japanese version of the Avro 504N, given the long designation Yokosuka Navy Type 3 Primary Trainer, powered by a 130 hp (97 kW) Mitsubishi-built Armstrong Siddeley Mongoose radial piston engine, 104 built.

Yokosuka K2Y2 

Improved version of the K2Y1, powered by a 160 hp (120 kW) Gasuden Jimpu 2 radial piston engine.

360 built (K2Y1 and K2Y2).

Watanabe built aircraft were given the long designation Watanabe Navy Type 3-2 Land-based Primary Trainer.

U-1 (Uchebnyi – 1) Avrushka 

Russian copy of the 504K.

Over 700 built.

MU-1 (Morskoy Uchebnyi – 1) 

Russian seaplane version.

Orlogsværftet Flyvemaskineværksted LB.I 

Danish production at the Royal Naval Dockyard (Orlogsværftet)





29 ft 5 in (8.97 m)


36 ft 0 in (10.97 m)


10 ft 5 in (3.18 m)

Wing area

330 sq ft (31 m2)

Empty weight

1,231 lb (558 kg)

Gross weight

1,829 lb (830 kg)

Fuel capacity

25.5 imp gal (31 US gal; 116 l) fuel,

6 imp gal (7 US gal; 27 l) castor oil


1 × Le Rhône 9J, 9 cylinder air-cooled rotary piston engine,

110 hp (82 kW)


2-bladed Avro fixed-pitch wooden propeller,

9 ft 0 in (2.74 m) diameter 8 ft 8 in (2.6 m) pitch


Maximum speed

95 mph (153 km/h, 83 kn) at sea level

87 mph (76 kn; 140 km/h) at 8,000 ft (2,438 m)

85 mph (74 kn; 137 km/h) at 10,000 ft (3,048 m)

Cruise speed

74 mph (119 km/h, 64 kn) at 75% power at 8,000 ft (2,438 m)

71 mph (62 kn; 114 km/h) at 75% power at 10,000 ft (3,048 m)

Stall speed

40 mph (64 km/h, 35 kn)


250 mi (400 km, 220 nmi)


2 hours at sea level at maximum speed

2 hours 8 minutes at 8,000 ft (2,438 m) at maximum speed

3 hours at 10,000 ft (3,048 m) at maximum speed

3 hours 42 minutes at 8,000 ft (2,438 m) at cruise speed

4 hours 15 minutes at 10,000 ft (3,048 m) at cruise speed

Service ceiling

16,000 ft (4,900 m)

Rate of climb

700 ft/min (3.6 m/s)

Time to altitude

3,500 ft (1,067 m) in 5 minutes

8,000 ft (2,438 m) in 10 minutes

10,000 ft (3,048 m) in 16 minutes

Wing loading

5.54 lb/sq ft (27.0 kg/m2)


0.06 hp/lb (0.099 kW/kg)


1 fixed .303 Lewis atop upper wing

(single-seat night fighter variants).



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