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SR.N6 Mk 1 to 5

(See SR.N6 Technical page for details of Mk 1 to 5 craft)

SR.N6 Mk 6C

This is a military twin-propeller SR.N6, of similar layout to the SR.N6 Mk 6. However, the construction of its side decks is different.

LIFT AND PROPULSION

Integrated system powered by a single Rolls Royce GN 1452 rated at 1,310shp at 15 ºC. Auxiliary power is supplied by a Lucas SS923 gas turbine driving a three-phase alternator.

EXTERNAL DIMENSIONS

Overall Length: 18.31 m
Overall Beam: 9.08 m
Overall Height on cushion: 6.78 m

TANKS

A single bag tank of 1,205 litres capacity is installed behind the cabin below the main engine support structure. Four long range fuel tanks, each of 454 litres capacity are fitted, two each side, within the side structure. A ballast system, of normal content 908 litres, is fitted, its tanks within the plenum chamber, close to the four corners of the craft. The fuel it contains can be transferred to the main fuel tank for extended range and, for further endurance, the ballast system can be filled to its maximum capacity of 1,816 litres.

CONTROLS

The craft is controlled by means of two rudders and the elevator assembly in conjunction with collective and differential propeller pitch control, roll control and yaw control doors.

The roll control system consists of two hydraulically actuated doors, normally open, fitted across the air feed to the rear trunks. They are controlled by means of solenoid valves selected by a switch at the commander's position. On selection of a roll control door, pressure in the port or starboard rear trunk is reduced, causing the craft to bank.

The propeller pitch change mechanism is actuated collectively by means of a lever adjacent to the elevator lever. Engine power is controlled by means of a twist grip on the propeller collective pitch lever, thus enabling the hover height and speed of the craft to be controlled with one hand. Differential pitch control is by means of a knob at the sub-panel below the main instrument panel. Movement of the commander's pitch controls is converted in to movement of the hydraulic pitch actuators by means of an electronic processing unit and electric actuators. The commander's throttle control is connected to the engine mounted throttle actuator.

ACCOMMODATION

The forward part of the cabin is occupied by the crew. Within the crew area, the commander's position is forward on the starboard side, with the radar station immediately behind. Forward on the port side is a platform for the observer and behind that the radio operator's position. A semi partition, carrying a weapon rack, is fitted at the rear of the crew area.

Behind the partial partition, the crew area is equipped with longitudinal bench seating for eighteen persons. The seating is readily convertible to provide bunks for eight and seating for two. Two doors each side give access from the personnel area on to the sidedecks.

At the back of the personnel area, a full partition with a door is fitted, behind which is the radio and electronics compartment which houses the radio racks and electrical distribution panels.

Windscreens are of toughened glass and are fitted with wipers and washers. The cabin side windows are of plexiglass.

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