Abstract: Individually operable ailerons pivotable to extend a forward end below a bottom wing surface and a rearward end above a top wing surface. The extended aileron forward end increases drag and subsumes the rudder function in the turn, while the aileron rear end produces drag and airflow redirection to reduce lift on the wing. The advantage of the safety ailerons is that habitual or instinctive pilot inputs to the yoke will recover from a dropped-wing stall at low speed and altitude, while conventional ailerons require counter-intuitive pilot actions to avoid crashing in such conditions.

Abstract: The invention provides a pump in the form of a length of hose reinforced by at least one extensible multi-filament strand, or parallel multi-filament strands, wound helically about it which during the application of torsion or tension to the hose is wound up, or has its helix angle reduced, so as to constrict the hose. In a torsion pump the reinforcement is unbalanced, meaning that there is no opposite helix, but in a tension pump reinforcement strands are wound about the hose in opposite senses providing a balanced structure.Preferably means is provided whereby relative movement between two members 10 and 11 caused by waves is used to distort and relax the length of hose 16, the resulting changes in its internal volume serving to pump water between inlet and outlet lines controlled by non-return valves 20 and 22. The hose length 16 is subjected to torsion as two rafts 10 and 11 pivot about an axis x, but in an alternative embodiment a hose length transverse to axis x is subject to tension.