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A mounting arrangement for a powertrain of a vehicle, the powertrain comprising an engine operable to produce a torque about a torque axis and the mounting arrangement comprising: a primary coupling connected at a primary mounting point of the powertrain and configured to securely couple the powertr

A mounting arrangement for a powertrain of a vehicle, the powertrain comprising an engine operable to produce a torque about a torque axis and the mounting arrangement comprising: a primary coupling connected at a primary mounting point of the powertrain and configured to securely couple the powertrain to a structural member of the vehicle; and, connected between the powertrain and one or more structural members of the vehicle: a pair of pitch control struts configured to substantially inhibit movement of the powertrain in directions perpendicular to the torque axis; and a roll control strut configured to substantially inhibit rotational motion of the engine about the torque axis; wherein the pitch control and roll control struts are connected to the powertrain and the one or more structural members of the vehicle at strut mountings configured to compliantly resist movements of the powertrain about the primary coupling in a direction parallel to the torque axis.

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1. A mounting arrangement for a powertrain of a vehicle, the powertrain comprising an engine operable to produce a torque about a torque axis and the mounting arrangement comprising: a primary coupling connected at a primary mounting point of the powertrain and is capable of securely coupling the po

1. A mounting arrangement for a powertrain of a vehicle, the powertrain comprising an engine operable to produce a torque about a torque axis and the mounting arrangement comprising: a primary coupling connected at a primary mounting point of the powertrain and is capable of securely coupling the powertrain to a structural member of the vehicle; and, connected between the powertrain and one or more structural members of the vehicle: a pair of pitch control struts that substantially inhibit movement of the powertrain in directions perpendicular to the torque axis; anda roll control strut that substantially inhibit rotational motion of the powertrain about an axis parallel to the torque axis;wherein the pair of pitch control struts and the roll control strut are connected to the powertrain and the one or more structural members of the vehicle at strut mountings that compliantly resist movements of the powertrain about the primary coupling in a direction parallel to the torque axis, each strut mounting having a mounting point;wherein the strut mountings of the pair of pitch control struts are flexible mounts having, in comparison to their stiffness in response to movement of the powertrain in directions perpendicular to the torque axis, a low stiffness in response to movement of the mounting points of the pair of pitch control struts at the powertrain relative to the mounting points of the pair of pitch control struts at the one or more structural members; andwherein the strut mountings of the roll control strut are flexible mounts having, in comparison to their stiffness in response to rotational movement of the powertrain about an axis parallel to the torque axis, a low stiffness in response to movement of the mounting point of the roll control strut at the powertrain relative to the mounting point of the roll control strut at the one or more structural members. 2. The mounting arrangement as claimed in claim 1, wherein the primary coupling comprises a flexible mount having, in comparison to the flexible mount's stiffness in response to movement of the powertrain parallel to the torque axis, a low stiffness in response to rotational movement of the powertrain about the primary coupling. 3. The mounting arrangement as claimed in claim 1, wherein the bending stiffness of each of the pair of pitch control struts has a bending stiffness that is significantly lower than each of the pair of pitch control strut's stiffness along each of the pair of pitch control strut's length; and the bending stiffness of the roll control strut has a bending stiffness that is significantly lower than the roll control strut's stiffness along the roll control strut's length. 4. The mounting arrangement as claimed in claim 1, wherein the primary coupling comprises an anchor rigidly connected to the powertrain engaged about an axle which is rigidly connected to the structural member of the vehicle, the axle being oriented substantially perpendicular to the torque axis. 5. The mounting arrangement as claimed in claim 4, wherein the primary coupling comprises a flexible mount having, in comparison to the flexible mount's stiffness in response to movement of the powertrain parallel to the torque axis, a low stiffness in response to rotational movement of the powertrain about the primary coupling; and wherein the flexible mount of the primary coupling is an elastic bushing located between the anchor of the powertrain and the axle. 6. The mounting arrangement as claimed in claim 5, wherein the elastic bushing has a low torsional stiffness in comparison to the elastic bushing's radial stiffness. 7. The mounting arrangement as claimed in claim 1, wherein each of the strut mountings at the powertrain comprise a pin rigidly connected to the powertrain and each of the strut mountings at one of the one or more structural members of the vehicle comprise a pin rigidly connected to the one of the one or more structural members of the vehicle, the ends of each of the pair of pitch control struts and the roll control strut being engaged about their respective pins so as to form a structural connection resilient to tension and compression of each of the pair of pitch controls strut and roll control strut between the powertrain and the one or more structural members of the vehicle. 8. The mounting arrangement as claimed in claim 7, wherein the primary coupling comprises an anchor rigidly connected to the powertrain engaged about an axle which is rigidly connected to the respective structural member of the vehicle, the axle being oriented substantially perpendicular to the torque axis; and wherein each pin is substantially perpendicular to the axle of the primary coupling. 9. The mounting arrangement as claimed in claim 7, wherein each pin is substantially parallel to the torque axis. 10. The mounting arrangement as claimed in claim 8, wherein each pin is substantially parallel to the torque axis. 11. The mounting arrangement as claimed in claim 7, wherein the strut mountings of the pair of pitch control struts comprise elastic bushings arranged between each of the pair of pitch control struts and each of their respective pins; and wherein the strut mountings of the roll control strut comprise elastic bushings arranged between the roll control strut and each of their respective pins. 12. The mounting arrangement as claimed in claim 8, wherein the strut mountings of each of the pair of pitch control struts comprise elastic bushings arranged between each of the pair of pitch control struts and each of their respective pins; and wherein the strut mountings of the roll control strut comprise elastic bushings arranged between the roll control strut and each of their respective pins. 13. The mounting arrangement as claimed in claim 9, wherein the strut mountings of each of the pair of pitch control struts comprise elastic bushings arranged between each of the pair of pitch control struts and each of their respective pins; and wherein the strut mountings of the roll control strut comprise elastic bushings arranged between the roll control strut and each of their respective pins. 14. The mounting arrangement as claimed in claim 10, wherein the strut mountings of each of the pair of pitch control struts comprise elastic bushings arranged between each of the pair of pitch control struts and each of their respective pins; and wherein the strut mountings of the roll control strut comprise elastic bushings arranged between the roll control strut and each of their respective pins. 15. The mounting arrangement as claimed in claim 11, wherein the elastic bushings have a low conical stiffness in comparison to their radial stiffness about their respective pins. 16. The mounting arrangement as claimed in claim 11, wherein the elastic bushings have a low torsional stiffness in comparison to their radial stiffness about their respective pins. 17. The mounting arrangement as claimed in claim 15, wherein the elastic bushings have a low torsional stiffness in comparison to their radial stiffness about their respective pins. 18. The mounting arrangement as claimed in claim 11, wherein the powertrain has a weight; and wherein the radial stiffness rate of the elastic bushings vary about each pin in such a way that, when the weight of the powertrain acts on the mounting arrangement, the radial stiffness about the pin is substantially constant. 19. The mounting arrangement as claimed in claim 15, wherein the powertrain has a weight; and wherein the radial stiffness rate of the elastic bushings vary about each pin in such a way that, when the weight of the powertrain acts on the mounting arrangement, the radial stiffness about the pin is substantially constant. 20. The mounting arrangement as claimed in claim 16, wherein the powertrain has a weight; and wherein the radial stiffness rate of the elastic bushings vary about each pin in such a way that, when the weight of the powertrain acts on the mounting arrangement, the radial stiffness about the pin is substantially constant. 21. The mounting arrangement as claimed in claim 17, wherein the powertrain has a weight; and wherein the radial stiffness rate of the elastic bushings vary about each pin in such a way that, when the weight of the powertrain acts on the mounting arrangement, the radial stiffness about the pin is substantially constant. 22. The mounting arrangement as claimed in claim 1, wherein the pair of pitch control struts are oriented such that each of the pair of pitch control strut is substantially directed towards the torque axis of the engine. 23. The mounting arrangement as claimed in claim 1, wherein the strut mounting of the roll control strut at the powertrain is located at the powertrain's periphery. 24. The mounting arrangement as claimed in claim 1, wherein the roll control strut is oriented to be substantially perpendicular to the torque axis. 25. The mounting arrangement as claimed in claim 1, wherein the powertrain further comprises a transmission housing securely mated at one end of the engine and the primary mounting point is rigidly attached to the transmission housing. 26. The mounting arrangement as claimed in claim 25, wherein the strut mountings of the pair of pitch control struts at the powertrain are attached to the engine at an end of the engine remote from the transmission housing. 27. The mounting arrangement as claimed in claim 1, wherein the engine is an internal combustion engine, the engine comprises an engine block, and the strut mountings are attached to the engine block. 28. The mounting arrangement as claimed in claim 1, wherein the pair of pitch control struts lie in a common plane perpendicular to the torque axis. 29. The mounting arrangement as claimed in claim 1, wherein the engine has a length along the direction of the torque axis, and wherein a distance in the direction of the torque axis between the primary mounting point and the strut mountings of the pair of pitch control struts at the powertrain is at least the length of the engine along the direction of the torque axis. 30. The mounting arrangement as claimed in claim 1, wherein the strut mountings of the pair of pitch control struts at the powertrain lie on either side of the plane defined by the torque axis and the primary mounting point. 31. The mounting arrangement as claimed in claim 1, wherein the primary coupling, the pair of pitch control struts and the roll control strut are the only structural connections between the vehicle and the powertrain. 32. The mounting arrangement as claimed in claim 1, wherein the engine is mounted in the vehicle such that the torque axis is substantially parallel to a major direction of travel of the vehicle.