De HAVILAND DH-9 WW1 BOMBER RC EP - BICKLEY SCALE WARBIRDS - 2022

PILOT / OWNER / BUILDER - STEPHEN MANSELL,

1/4 scale - DH9A

Wing span - 128 inches

Total wing area - 30.25 sq ft

All up weight - including 1 kg (2.2 lb) of lead and 4x 5s 5800mah lipos 15.21 kg (33.51 lb)

Wing loading - 0.5 kg (1.11 lb) per sq ft

Rotomax 50 brushless motor

180 amp yep esc

24x8 prop

Max amps (take off) 88.6

Max wattage 3426

Finished as s/n H95 of Number 27 squadron, H flight. Risalpur, India, 1922.

The main reason I got it finished sooner than planned was the fact all the pubs were shut for 3 months !

The Airco DH.9 – also known after 1920 as the de Havilland DH.9 – was a British single-engined biplane bomber developed and deployed during the First World War. The DH.9 was a development of Airco's earlier successful DH.4, with which it shared many components.

Range: 810 km
Introduced: 1917
Last flight: 1920
Engine type: Siddeley Puma
Manufacturer: Airco
First flight: July 1917
Variants: Airco DH.9A; Airco DH.9C; Westland Walrus

Design -

The Airco DH.9 was a single-engine British bomber aircraft, sharing a high level of similarities with the preceding DH.4.The standard flight surfaces were broadly the same, but adopted a highly redesigned fuselage configuration, including the repositioning of the pilot's cockpit to a more rearwards position.

Structurally, the fuselage was similar to its predecessor; plywood cladding covered the forward fuselage, which had no internal bracing, while a conventional wire-braced box girder structure was used aft of the cockpits. Internal stowage for a pair of 230 lb (100 kg) or four 112 lb (51 kg) bombs was provided for, although little use of this capability was made operationally.

While the DH.9 was deemed to be suitable for daytime bombing operations, it was found to be incapable of effective nighttime bombing due to the pilot's view being obstructed and visibility via the bombsight being unsuitable. The revised cockpit positioning of the DH.9 from the DH.4 placed the pilot and the observer closer together, which was viewed by the RAF as being a considerable advantage in aerial combat; however, the pilot's visibility for ground reconnaissance was decreased as a result. Both radio sets and cameras could be installed.

The fuel tanks were enclosed in doped fabric, intended to drain fuel away if the tanks were hit by enemy fire. According to the testing squadron, the DH.9 possessed a high level of manoeuvrability, was relatively easy to perform landings aside from a poor view during the approach.

Various improvements and supplementary equipment were trialled and occasionally adopted. Tests of various engines, radiators, silencers and parachutes were conducted to evaluate their performance, however, few of these improvements were ultimately adopted. During the war, numerous customisations and improvised improvements were made to the aircraft by the maintenance crews of individual squadrons, often for the purpose of addressing the type's engine performance issues.

After the end of the war, many DH.9s, which had been originally delivered as bombers, were sold; these were often reconfigured to serve in different roles, including passenger and cargo transport, trainer aircraft, and as air ambulances.

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FILMED AT BICKLEY MODEL FLYING CLUB ON 1-5-2022,