Abstract: The present invention is concerned with an improved fuel cell stack assembly comprising a metal base plate on which is mounted at least one fuel cell stack and a metal end plate, each stack comprising at least one fuel cell stack layer that comprises at least one fuel cell and at least one electrically insulating compression gasket, wherein a skirt is attached to the base and end plates enclosing the stack and is under tension therebetween so as to maintain a compressive force through the stack, thereby obviating the need for tie-bars.

Abstract: The present invention is concerned with an improved fuel cell stack assembly (10) comprising a metal base plate (20) on which is mounted at least one fuel cell stack (30) and a metal end plate (40), each stack comprising at least one fuel cell stack layer (50) that comprises at least one fuel cell (101, 102) and at least one electrically insulating compression gasket (110), wherein a skirt (130) is attached to the base and end plates enclosing the stack and is under tension therebetween so as to maintain a compressive force through the stack, thereby obviating the need for tie-bars.

Abstract: A port belt arrangement for use in a two-stroke internal combustion engine containing a pair of adjacent cylinders. The arrangement including a first hollow annulus defining a first annular channel, the first annular channel tapering in a radial direction, with increasing circumferential distance from a first port, an inner wall of the first annular channel having a second port, and a second hollow annulus defining a second annular channel, the second annular channel tapering in a radial direction, with increasing circumferential distance from a third port, an inner wall of the second annular channel having a fourth port, wherein the first hollow annulus and the second hollow annulus are joined together at a joining point located on each of their circumferences. The cross-sectional area of the first annular channel at the joining point is less than the cross-sectional area of the first annular channel at the point on the circumference of the first hollow annulus which is furthest from the joining point.

Abstract: The present invention is concerned with an improved fuel cell stack assembly (10) comprising a metal base plate (20) on which is mounted at least one fuel cell stack (30) and a metal end plate (40), each stack comprising at least one fuel cell stack layer (50) that comprises at least one fuel cell (101, 102) and at least one electrically insulating compression gasket (110), wherein a skirt (130) is attached to the base and end plates enclosing the stack and is under tension therebetween so as to maintain a compressive force through the stack, thereby obviating the need for tie-bars.

Abstract: A port belt arrangement for use in a two-stroke internal combustion engine containing a pair of adjacent cylinders. The arrangement including a first hollow annulus defining a first annular channel, the first annular channel tapering in a radial direction, with increasing circumferential distance from a first port, an inner wall of the first annular channel having a second port, and a second hollow annulus defining a second annular channel, the second annular channel tapering in a radial direction, with increasing circumferential distance from a third port, an inner wall of the second annular channel having a fourth port, wherein the first hollow annulus and the second hollow annulus are joined together at a joining point located on each of their circumferences. The cross-sectional area of the first annular channel at the joining point is less than the cross-sectional area of the first annular channel at the point on the circumference of the first hollow annulus which is furthest from the joining point.