(Bristol) Scout @·AIRCRAFTUBE

  • Bristol Scout B Bristol Scout B
    Bristol Scout B
  • RNAS Bristol Scout C with rear oil tank RNAS Bristol Scout C with rear oil tank
    RNAS Bristol Scout C with rear oil tank
  • The Vickers Challenger synchroniser The Vickers Challenger synchroniser
    The Vickers Challenger synchroniser
  • Bristol Scout D with twin Lewis gun assembly Bristol Scout D with twin Lewis gun assembly
    Bristol Scout D with twin Lewis gun assembly
  • Bristol Scout C No 1611 of Lanoe Hawker Bristol Scout C No 1611 of Lanoe Hawker
    Bristol Scout C No 1611 of Lanoe Hawker
  • Bristol Scout C (RNAS) Bristol Scout C (RNAS)
    Bristol Scout C (RNAS)
  • Bristol Scout Revised A Bristol Scout Revised A
    Bristol Scout Revised A
  • Prototype at the 1914 Olympia Aero Show Prototype at the 1914 Olympia Aero Show
    Prototype at the 1914 Olympia Aero Show
  • Bristol Scout Bristol Scout
    Bristol Scout
  • Bristol Scout Revised A Bristol Scout Revised A
    Bristol Scout Revised A

Bristol Scout

The Bristol Scout was a single-seat rotary-engined biplane originally designed as a racing aircraft. Like similar fast, light aircraft of the period it was used by the RNAS and the RFC as a "scout", or fast reconnaissance type. It was one of the first single-seaters to be used as a fighter aircraft, although it was not possible to fit it with an effective forward-firing armament until the first British-designed gun synchronizers became available later in 1916, by which time the Scout was obsolescent. Single-seat fighters continued to be called "scouts" in British usage into the early 1920s.

Background

The Bristol Scout was designed in the second half of 1913 by Frank Barnwell and Harry Busteed, Bristol's chief test pilot, who thought of building a small high-performance biplane while testing the Bristol X.3 seaplane, a project which had been designed by a separate secret design department headed by Barnwell. The design was initially given the works number SN.183, inherited from a cancelled design for the Italian government undertaken by Henri Coanda, the half-finished fuselage of which remained in the workshops and the drawings for the aircraft bore this number.

Design and development

The design was an equal-span single-bay biplane with staggered parallel-chord wings with raked wingtips and ailerons fitted to the upper and lower wings, which were rigged with about half a degree of dihedral, making them look almost straight when viewed from the front. The wing section was one designed by Coanda which had been used for the wings of the Bristol Coanda Biplanes. The rectangular-section fuselage was an orthodox wire-braced wooden structure constructed from ash and spruce, with the forward section covered with aluminium sheeting and the rear section fabric covered. It was powered by an 80 hp (60 kW) Gnome Lambda rotary engine enclosed in a cowling that had no open frontal area, although the bottom was cut away to allow cooling air to get to the engine. It had a rectangular balanced rudder with no fixed fin and split elevators attached to a non-lifting horizontal stabiliser. The fixed horizontal tail surfaces were outlined in steel tube with wooden ribs and the elevators constructed entirely of steel tube.

The first flight was made at Larkhill on 23 February 1914 by Busteed and it was then exhibited at the March 1914 Aero Show at Olympia in London. After more flying at Larkhill the prototype, later referred to as the Scout A, was returned to the factory at Filton and fitted with larger wings, increasing the chord by six inches (15 cm) and the span from 22 ft (6.71 m) to 24 ft 7 in (7.49 m). These were rigged with an increased dihedral of ​1 3⁄4°. Other changes included a larger rudder, a new open-fronted cowling with six external stiffening ribs distributed in symmetrically uneven angles around the cowl's sides (especially when seen from "nose-on") and fabric panel-covered wheels. It was evaluated by the British military on 14 May 1914 at Farnborough, when, flown by Busteed, the aircraft achieved an airspeed of 97.5 mph (157 km/h), with a stalling speed of 40 mph (64 kph) The aircraft was then entered for the 1914 Aerial Derby but did not take part because the weather on the day of the race was so poor that Bristol did not wish to risk the aircraft. By this time two more examples (works nos. 229 and 230) were under construction and the prototype was sold to Lord Carbery for £400 without its engine. Carbery fitted it with an 80 hp Le Rhône 9C nine-cylinder rotary and entered it in the London–Manchester race held on 20 June but damaged the aircraft when landing at Castle Bromwich and had to withdraw. After repairs, including a modification of the undercarriage to widen the track, Carbury entered it in the London–Paris–London race held on 11 July but had to ditch the aircraft in the English Channel on the return leg; while in France, only one of the two fuel tanks had been filled by mistake. Carbury managed to land alongside a ship and escaped but the aircraft was lost.

Numbers 229 and 230, later designated the Scout B when Frank Barnwell retrospectively gave type numbers to early Bristol aircraft, were identical to the modified Scout A, except for having half-hoop-style underwing skids, what appear to be six stiffening ribs positioned around the engine cowl's exterior circumferential surface (also made with a larger circular front opening for engine cooling when compared to the Scout A) and an enlarged rudder. Completed shortly after the outbreak of war in August 1914, they were requisitioned by the War Office. Given Royal Flying Corps serial numbers 644 and 648, one was allocated to No. 3 Squadron and the other to No. 5 Squadron for evaluation. Number 644 was damaged beyond repair on 12 November 1914 in a crash landing.

Impressed by the performance of the aircraft, the War Office ordered twelve examples on 5 November and the Admiralty ordered a further 24 on 7 November. The production aircraft, later called the Scout C, differed from their predecessors mainly in constructional detail, although the cowling was replaced by one with a small frontal opening and no stiffening ribs, the top decking in front of the cockpit had a deeper curve and the aluminium covering of the fuselage sides extended only as far as the forward centre-section struts, aft of which the decking was plywood.

Operational history

The period of service of the Bristol Scout (1914–1916) marked the genesis of the fighter aircraft as a distinct type and many of the earliest attempts to arm British tractor configuration aircraft with forward-firing guns were tested in action using Bristol Scouts. These began with the arming of the second Scout B, RFC number 648, with two rifles, one each side, aimed outwards and forwards to clear the propeller arc.

Two of the Royal Flying Corps' early Bristol Scout C aircraft, numbers 1609 and 1611, flown by Captain Lanoe Hawker with No. 6 Squadron RFC, were each, in their turn – as 1609 was written-off from combat damage, 1611 received its gun mount hardware as its replacement—armed with a Lewis machine gun on the left side of the fuselage, almost identical to the manner of the rifles tried on the second Scout B, using a mount that Hawker had designed. When Hawker downed two German aircraft and forced off a third on 25 July 1915 over Passchendaele and Zillebeke he was awarded the first-ever Victoria Cross for the actions of a British single-seat military scout/fighter pilot in aerial combat against an enemy's heavier-than-air aircraft, following the earlier VC awards to William Rhodes-Moorhouse (flying a B.E.2 two-seat observation biplane) and Reginald Warneford (flying against an enemy Zeppelin) in April and June 1915 respectively.

Some of the 24 initial production Scout Cs for the RNAS, were armed with one (or occasionally two) Lewis machine guns, sometimes with the Lewis gun mounted on top of the upper wing centre section in the manner of the Nieuport 11; more common was a very dubious choice of placement by some RNAS pilots, in mounting the Lewis gun on the forward fuselage of their Scout Cs, just as if it were a synchronized weapon, firing directly forward and through the propeller arc, an action likely to result in serious damage to the propeller. The type of bullet-deflecting wedges that Roland Garros had tried on his Morane-Saulnier Type N monoplane were also tried on one of the RFC's last Scout Cs, No. 5303 but since this seemed to have also required the use of the Morane-Saulnier Type N's immense "casserole" spinner, which almost totally blocked cooling air from reaching the engine, the deflecting-wedge method was not pursued further with Bristol Scouts.

An RNAS Scout was the first landplane to be flown from a ship, when Flt. Lt. H. F. Towler flew No. 1255 from the flying deck of the seaplane carrier HMS Vindex on 3 November 1915. As an attempted defence against German airships, some RNAS Scout Ds were equipped with Ranken Darts, a flechette with 1 lb (0.45 kg) of explosive per projectile, released from a pair of vertical cylindrical containers under the pilot's seat, each containing 24 darts. On 2 August 1916, Flt. Lt. C. T. Freeman flew a Scout from the deck of Vindex and attacked Zeppelin L 17 with Ranken Darts. None of the darts did any damage to the Zeppelin, and since Freeman's aircraft could not land on the Vindex and was too far from land for a safe return, he had to ditch his Scout D after the attack.

In March 1916, RFC Scout C No.5313 was fitted with a Vickers machine gun, synchronised to fire through the propeller by the awkward Vickers-Challenger synchronising gear, the only gear available to the RFC at that time. Six other Scouts, late Scout Cs and early Scout Ds, were also fitted with the same combination. Types using this gear (including the B.E.12, the R.E.8 and the Vickers F.B.19) all had the gun mounted on the port side of the fuselage. The attempt to use the gear for synchronising a centrally mounted gun on the Bristol Scout failed and tests, which continued at least until May 1916, resulted in the abandonment of the idea and no Vickers-armed Bristol Scouts were used in operations.

None of the RFC or RNAS squadrons operating the Bristol Scout were exclusively equipped with this aircraft and by the end of the summer of 1916, no new Bristol Scout aircraft were being supplied to the British squadrons of either service, the early fighter squadrons in RFC service being equipped instead with the Airco DH.2 single-seat Pusher configuration fighter. A small number of Bristol Scouts were sent to the Middle East (in Egypt, Mesopotamia and Palestine) in 1916. Others served in Macedonia and with the RNAS in the Eastern Mediterranean. The last known Bristol Scout in military service was the former RNAS Scout D No. 8978 in Australia, which was based at Point Cook, near Melbourne, as late as October 1926.

Once the Bristol Scouts were no longer required for frontline service they were reallocated to training units, although many were retained by senior officers as personal "runabouts".

Variants

Scout A

The single prototype aircraft.

Scout B

Two manufactured, identical to the modified Scout A except for having half-hoop-style underwing skids and an enlarged rudder.

Type 1 Scout C

Similar to the previous Scout B. These early Scout Cs, in a total run of 36 aircraft — twelve for the Royal Flying Corps, and 24 for the RNAS — also had their main oil tank moved to a position directly behind the pilot's shoulders, requiring a raised rear dorsal fairing immediately behind the pilot's seat to accommodate it. These aircraft used a small-central opening, "dome-fronted" cowl that were only intended for use with the 80 hp Gnome Lambda seven cylinder rotary engine, curiously the rotary engine choice the Royal Naval Air Service favored.

Following the initial run of 36 Scout C airframes, later Scout C production batches, consisting of 50 aircraft built for the RNAS and 75 for the RFC, changed the cowl to a flat-fronted shorter-depth version able to house either the Gnome Lambda rotary, or the alternate choice of a nine-cylinder 80 hp Le Rhône 9C rotary engine when the Gnome Lambda was not used, and moved the oil tank forward to a position in front of the pilot for better weight distribution and more reliable engine operation. The later cowl for the remaining Scout C aircraft still had the small opening of the domed unit, with both cowl designs having a circumferential slot-style cutaway made at mid-cowl depth of about one-sixth the circumference, to the lowest perimeter of the cowl to increase the cooling effect, and to allow any unburned fuel/oil mix to drain away. A total of some 161 Scout C airframes were produced for the British military as a whole, with the transition to the Scout D standard taking place in a gradual progression of feature changes.

Types 2, 3, 4 and 5 Scout D

The last, and most numerous production version, the Scout D, gradually came about as the result of a series of further improvements to the Scout C design. One of the earliest changes appeared on seventeen of the 75 naval Scout Cs with an increase in the wing dihedral angle from ​1 3⁄4° to 3° and other aircraft in the 75 aircraft naval production run introduced a larger-span set of horizontal tail surfaces and a broadened-chord rudder, shorter-span ailerons and a large front opening for the cowl, much like that of Scout B but made without the external stiffening ribs instead.

The newer cowl was sometimes modified with a blister on the starboard lower side for more efficient exhaust-gas scavenging, as it was meant to house the eventual choice of the more powerful, nine-cylinder 100 hp Gnôme Monosoupape B2 rotary engine in later production batches, to improve the Scout D's performance. Some 210 examples of the Scout D version were produced, with 80 of these being ordered by the RNAS and the other 130 being ordered by the Royal Flying Corps.

Other variants

S.2A : Two-seat fighter version of the Scout D. Two were built as advanced training aircraft.

Operators

  • United Kingdom :
    • Royal Flying Corps.
    • Royal Naval Air Service.
  • Australia : Australian Flying Corps.
  • Greece : Hellenic Navy.

Survivors and reproductions

Two notable reproductions of the Bristol Scout have been built for flight – Leo Opdycke, the founder of the World War I AERO quarterly publication, started building a reproduction Scout D in 1962 in New York State, meant to be powered with a Le Rhône 9C 80 hp rotary engine. The aircraft slowly took form at his home, then in Poughkeepsie, New York, through the early 1980s, when it was completed, then brought to the nearby Old Rhinebeck Aerodrome and flown once there successfully, ending in a slight mishap without injury. The uncovered complete airframe, with engine, is today on display at the Fleet Air Arm Museum in Yeovilton, UK.

The other is a reproduction Bristol Scout C, a reproduction of No. 1264, one of the first 24 Scout Cs built for the RNAS, but using the preserved joystick, rudder bar and still-functional Bosch starting magneto from the original No. 1264 aircraft. David and Sue Bremner of the UK, grandchildren of the original pilot of No. 1264, wanted to create an airworthy tribute to their grandfather, RNAS pilot Francis Donald Holden Bremner, in 2002 using the artifacts of their grandfather's original. Research started in 2002, with construction of the airframe starting in 2008. The first flight of the reproduction, powered likewise to Opdycke's earlier reproduction project with a Le Rhône 9C rotary, occurred on 9 July 2015, with a visit to the area around Gallipoli where their grandfather's aircraft was based from December 1915 to August 1916 to fly the reproduction where their grandfather's original Scout C flew against the Central Powers.

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This text is available under the Creative Commons Attribution-ShareAlike License
Source : Article Bristol Scout of Wikipedia ( authors )

Bristol Scout

  • Role : single-seat scout/fighter.
  • Manufacturer : British and Colonial Aeroplane Company.
  • Designer : Frank Barnwell.
  • First flight : 23 February 1914.
  • Primary users :
    • Royal Flying Corps.
    • Royal Naval Air Service.
    • Australian Flying Corps.
  • Produced : 1914–1916.
  • Number built : 374.

    • Specifications (Bristol Scout D)

  • Crew : one.
  • Length : 20 ft 8 in (6.30 m).
  • Height : 8 ft 6 in (2.59 m).
  • Wingspan : 24 ft 7 in (7.49 m).
  • Wing area : 198 ft² (18.40 m²).
  • Empty weight : 789 lb (358 kg).
  • Loaded weight : 1,195 lb (542 kg).
  • Maximum speed : 94 mph (151 km/h).
  • Range : 300 km (187 mi).
  • Service ceiling : 16,000 ft (4,900 m).
  • Rate of climb : 18 min 30 sec to 10,000 ft (18 min 30 sec to 3,048 m).
  • Power/mass : 0.067 hp/lb (0.11 kW/kg).
  • Combat endurance : 2½ hours.
  • Powerplant : One Le Rhône 9C rotary piston engine.
  • Power : 80 hp (60 kW).
  • Armament : One Lewis or Vickers machine gun.

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This text is available under the Creative Commons Attribution-ShareAlike License
Source : Article Bristol Scout of Wikipedia ( authors )
Bristol Scout : Your comments on this subject
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