Abstract: A rigging comprises a mast controllably about a longitudinal axis; a flexible sail comprising a starboard and port flexible sail portions; a plurality of elongated battens which extend a luff and a leach of sail portions; each batten is pivotally connected to a respective outermost part of the respective side of the mast. Rotation of the mast causes the battens connected to one of the sail portions to be compressed along their length and causes the battens connected of the other sail portions to be tensioned along their length so as to change the shape of an aerofoil formed by the sail.

Abstract: A rigging for a wing propelled craft comprises a mast having a starboard side and a port side, wherein the mast is controllably rotatable in either direction about a longitudinal axis; a flexible sail comprising a star-board flexible sail portion and a substantially identical port flexible sail portion, each flexible sail portion having a luff and a leach, wherein the luff of each sail portion is connected to a respective side of the mast; and a plurality of elongated battens, each of which extends substantially between the luff and the leach of one of the respective sail portions, each of which is in contact with the respective flexible sail portion.

Abstract: A computer-implemented method of graphically defining a formula, includes providing a first operator object for defining a method of manipulating at least one input to produce at least one result. A graphical representation of the first operator object is displayed. A variable object for containing data is provided. An input from a user to relate the variable object to one of inputs or one of the results of the first operator object is received. A graphical representation of the first variable object and its relation to the operator object is displayed. A logical description of the relationship between objects is recorded thereby defining the formula.

Abstract: A computer implemented method of graphically defining a formula comprises the steps of: providing a graphically defined formula including one or more objects that graphically define the formula; selecting one or more of the objects to be grouped into a new component object; determining the number of connections that provide an input to the selected objects; determining the number of connections that provide an output to the selected objects; determining a graphical definition of the formula, where the selected objects are replaced with a representation of the new component object having the determined number of inputs and the determined number of outputs, connection(s) inputting to the selected objects from other objects are replaced with connection(s) connecting to the input(s) of the new component object and connection(s) outputting from the selected objects to the other objects are replaced with connection(s) connecting from the output(s) of the new component object; and determining a logical definition

Abstract: A computer-implemented method of graphically defining a formula, includes providing a first operator object for defining a method of manipulating at least one input to produce at least one result. A graphical representation of the first operator object is displayed. A variable object for containing data is provided. An input from a user to relate the variable object to one of inputs or one of the results of the first operator object is received. A graphical representation of the first variable object and its relation to the operator object is displayed. A logical description of the relationship between objects is recorded thereby defining the formula.