SGA-001 fuel tanks

Bristol Pegasus XXII Engines - Medium supercharged units rated at 1010 hp for take off. Driving De Havilland three bladed two position variable-pitch airscrews
Nose Turret - Nash and Thompson FN11 hydraulically powered turret. Arranged to be manually retracted toward the stern to allow for mooring operations. Fitted with one Vickers "K" type gas operated machine gun and five ammunition drums containing 100 rounds .303 calibre each. (Drums recovered from T9044 contain a mixture of 'ball', tracer and armour piercing rounds). The floor of the front gun position was hinged, when down, the position could be used for mooring. When up it acted as a footrest for the gunner.
Fuel Tanks - The wings accommodated six fuel tanks, (three in each) with a total capacity of 9,200 litres (2025 imp' gallons. Smaller fuel tanks were added later behind the rear wingspar increasing the capacity to 11,602 litres (2,550 imp' gallons). This was enough for eight to fourteen hour patrols. It wasn't uncommon for entire crews to give up their parachutes to save weight and therefore increase the patrol time.
Astrodome and Hatch - When afloat, this gave the crew access to the upper surfaces of the aircraft. During patrols, the navigator would take sightings from here and during combat conditions it would act as the Firing Control Centre.
Flight Control Surfaces - These allowed the pilot to adjust and control the aircraft's flight attitude, known as: Roll, Pitch and Yaw. The surfaces are: ailerons, flaps, rudder and elevators. Control surfaces were constructed in metal (Duralumin) with a stretched fabric covering.
Rear Turret - Nash and Thompson FN13 hydraulically powered turret. Fitted with four Browning .303 calibre machine guns.
Auxillary Engine Bay - A fire proof compartment in the leading edge of the wing contained a small ABC (All British engine Company) two cylinder four stroke engine. This was used when moored to drive accessories such as the bilge and refuelling pumps in addition to a Dynamotor which was used for accumulator charging.
Engineers Platform - Either side of each engine, located in the leading edge of the wing were fold-away Engineers platforms. When out, a plank could be laid between them to form a working area for engine maintenance.
Wing - Swept back monoplane wing, Alclad covering with countersunk riveting.
Wing Float - Alclad covering with tubular struts and streamline wire bracing.
Bomb Aimers Window - Retractable viewport
Cockpit - Accommodated two pilots, side by side. All controls except ailerons were duplicated.
Midships Gun Mounting - Gunners stood on a platform with their heads out in the slipstream protected by a windshield. Armament was a Vickers 'K' type gas operated machine gun with five ammunition drums as the front turret.
Forward Entrance Door - One of two doors, this being the usual entrance, the other being on the starboard side just forward of the rear hull step. In addition to these, there was a smaller hatchway just forward of the starboard tailplane.
HF/DF Loop (High Frequency/Direction Finder). Affectionately known as the huff duff. Direction Finding Loop Antenna, this could be rotated from inside the aircraft.
Bomb Room Door - Located, one either side of the hull. Spring loaded doors opened (inwards) to allow bomb racks to be run out from the bomb room to their working position under the wing. The main offensive load was up to 2,000 lb (910 kg)
Forward Hull - This was divided into two decks. The upper accommodating two Pilots, Navigator, Wireless Operator and the Engineer. Towards the rear of the upper deck was stowage for flares and maintenance cradles. The lower deck housed the mooring compartment, lavatory, officer's wardroom, galley and quarters for the crew. The wardroom and crew quarters had bunks and folding tables. The galley was equipped with a cooker, fresh water tank, paraffin tank, draining rack and an ice chest.
Rear Hull - This area housed general marine equipment, drogues, bollards, anchor etc. there was a fitters work bench complete with a vice, the flare launching chute and flare storage along with a camera mount. Equipment also included two collapsible dinghies and oars, marine distress signals, smoke puffs, telephone system even awnings for use in hot climates!
Planing Hull - The takeoff run of a Sunderland was often dependent only on the length of water that was available. It could be a problem to gain sufficient speed for the aircraft to plane, which meant there wasn't enough speed to become airborne. Once planing, the aircraft had to break free from the suction of the water on the hull. This was partly helped by the "step" in the hull just behind the aircraft's centre of buoyancy at planing speed. The pilot could rock the craft about this point to try to break the downward pull of the water on the surface of the hull. Rough water was a help in freeing the hull from this suction, but on calm days it was often necessary to have a high speed launch criss-cross in front of the aircraft to cause a break in the water flow under the aircraft.

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