The Avro504 was built in a number of variants and it should be noted that this web page concentrates on Avro504 to Avro504H - Other variants are dealt with on alternative web pages on this website.

Avro 504 prototype
Avro 504 prototype after modification with conventional ailerons.


First flown at Brooklands in 1913 and still in RAF service in 1944, the A.V.Roe Avro 504 biplane was a development of the Avro 500, AV Roe's first successful family of British Military aircraft. The Avro 504 was built in greater numbers than any other British aircraft during the First World War.
Ultimately manufactured by at least 18 sub-contractors, the total number built during the First World War remains unclear, although there is general agreement that it was more than 8,000. Furthermore, if the total were to include aircraft built overseas then it exceeds 10,000. It should be noted that the numbers quoted in this entry follow those presented at which we believe to be the most comprehensive list available.
The Avro 504 was a lightly-built, conventional tractor biplane with staggered, two bay wings. As originally flown on 18th September 1913, the prototype featured inverse-tapered ailerons, which relied on warping of their tips to provide roll control.
The distinctive undercarriage comprised a pair of undercarriage legs incorporating bungee-sprung suspension, with an extended central curved ash skid. The nominally 80hp Gnome Monosoupape 7-cylinder engine was mounted in a square cowling with bulged sides.
Early changes to the design involved the adoption of a more streamlined cowling and conventional ailerons.
Among a number of notable flights, the prototype climbed over Brooklands to a height of 15,000 ft on 4th February 1914. This was followed by an officially observed climb, with a passenger, to 14,420 ft on 10th February.

The Avro 504

The Avro 504 was ordered into production in mid-1913 and a total of 67 production Avro 504s were built for the RFC and RNAS.
Perhaps the most notable Avro 504 operational sortie was made by the RNAS with a successful long-range flight to bomb the Zeppelin Airship Sheds at Friederichshafen on 21st November 1914.
Avro 504 785
785 is an Avro 504 from the first wartime production batch of 44 aircraft.

The Avro 504A

The Avro 504A was a revised model for the Royal Flying Corps. with wider chord wing struts and ailerons of a reduced span. 1,485 Avro 504As were built.

The Avro 504B

Built for the Royal Naval Air Service, the Avro 504B featured more significant modifications such as a larger dorsal fin ahead of an unbalanced rudder.
Less obvious externally however, was the use of larger cross-section wing spars. Additional changes included on some aircraft with curved cut-outs to the rear cockpit sides, to improve crew access whilst it also reverted to longer span ailerons.
A total of 200 Avro 504B were built.
Avro 504B RNAS 9885
Parnall-built Avro 504B RNAS 9885.

Avro 504C and Avro 504D

The threat of night-bombing by Zeppelin airships led to the development of the next two Avro 504 versions. These were the single seat, long endurance, coastal patrol Avro 504C for the RNAS and the Avro 504D, built specifically for the Royal Flying Corps (RFC).
The Avro 504C offered eight hours endurance and was intended to intercept airships before they made landfall. An upward firing machine gun was fitted, using incendiary ammunition.
The 504D was designed for Zeppelin interception by the RFC and it retained the original ‘comma-shaped’ rudder unlike the Royal Naval Air Service (RNAS) aircraft, with their fixed fin and unbalanced rudder.
80 Avro 504Cs and just six Avro 504Ds were built.

Avro 504E and Avro 504F

The last of the early models were, in effect, experimental versions and comprised of 10 Royal Naval Air Service (RNAS) Avro 504E's, fitted with a 100 hp Gnome Monosoupape engine and reduced wing stagger.
A single Avro 504F was built, converted from an Avro 504C and featured a 75 hp Rolls-Royce Hawk in-line engine.

Avro504G and Avro 504H

The 30 RNAS Avro 504Gs were conversions of the Avro 504B, fitted with bomb racks, twin synchronised forward-firing Vickers guns and a Scarff-mounted Lewis gun in the rear cockpit.
Finally, 12 Avro 504Hs were strengthened and converted versions of the Avro 504C, used for catapult trials.


                             Prototype Avro 504A
Powerplant One 80hp Gnome  One 80hp Gnome, 80hp Le Rhone, or 80hp Clerget rotary engine
Span 36 ft 0 in
Maximum Weight 1,550 lb 1,700 lb
Capacity and armament Two seats, unarmed Two seat, four 20lb bombs. Anti-Zeppelin aircraft (504C, D) fitted with one Lewis gun and increased fuel capacity
Maximum Speed 81 mph 86 mph
Range 3 hours 4.5 hr (504C, D 8 hr)


Variants & Numbers Built

Avro 504 prototype One only
Avro 504  Original model. 80hp Gnome, Le Rhône or Clerget engines. 67 built
Avro 504A  Modified with smaller ailerons and broader struts.  80hp Gnome, Le Rhône or Clerget engines. 1,485 built
Avro 504B  Version for RNAS with stronger wing spars and a larger fin. 80hp Gnome or Le Rhône engines. 200 built
Avro 504C  Single-seat anti-Zeppelin aircraft for the RNAS. The 504C was fitted with an extra fuel tank, in place of the observer.80hp Gnome engine. 80 built
Avro 504D Single-seat anti-Zeppelin aircraft for the Royal Flying Corps. 80hp Gnome engine. 6 built
Avro 504E 100hp Gnome Monosoupape engine. 10 built
Avro 504F One aircraft fitted with the 75hp Rolls Royce Hawk engine. An order for 30 was cancelled and replaced by 504Bs. One aircraft (converted Avro 504C)
Avro 504G Two-seat training variant of the 504B for the RNAS. 80hp Gnome engine. 30 built
Avro 504H Used for catapult trials. 80hp Gnome engine. 12 (converted Avro 504C)



No examples of early Avro 504 (prototype to Avro 504H) survive.

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