Unmanned Systems Technology 009 | Ocean Aero Submaran S10 | Simulation and testing | Farnborough report | 3W-110xi b2 TS HFE FI | USVs | Data storage | Eurosatory/UGS 2016 report

28 worm drive that locates in the centre of the upper clutch housing. These worms project up into the worm drive housing and turn gears with which they form the first stage of speed reduction in the transmission. The gears themselves turn shafts with worms on the other end that engage with worm gear rings that constitute the second stage of speed reduction, and turn the wing AOI and flap drive mechanisms in the wing hub gearbox assembly. Wing sail and flap gearboxes The worm gears are mounted in the centre of this gearbox, with the wing sail AOI drive below and the flap drive above. These drive mechanisms include hydraulically actuated clutches. They run in hydraulic fluid and serve to disconnect the flap and wing sail from the motor and clutch system to protect all the components from excessive torque loadings that might be caused by wave impacts. They are also used to feather the sail during tacking and jibing manoeuvres. The lower splined collar is fixed to the wing AOI drive trunnion with a clamp, which also transmits the weight of the wing through a thrust bearing to the core block, in which it is secured with a snap ring. The upper end is welded to the wing stub spar, the preferred spar materials being either a stainless steel such as 4130 or an aluminium alloy such as 6061 T6. The upper splined collar is also fixed to its trunnion with a clamp, which is free to revolve around the wing sail trunnion. The upper splined collar also forms a cable idler for the flap drive pulley system. Not only does the flap drive adjust the angle of the flap with respect to the main wing to control the camber, it also serves to fold the flap back against the main wing when the whole system is retracted before submerging. The flap folds about two axes by means of cables and pulleys, allowing the flap to lie flat against the wing with their chords in parallel. Any lift/thrust- August/September 2016 | Unmanned Systems Technology A more revealing view of the hull, showing internal structural elements such as bulkheads An extensive series of submergence trials ensured that the S10’s buoyancy control system would work reliably and also served to prove the watertight encapsulation of the vessel’s electrical and electronic systems