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A transfer coupling includes a static component and a rotatable component arranged concentrically, the static component including a first number of radially extending ports and the rotatable component having a second number of radially extending ports the radially extending ports arranged in a commo

A transfer coupling includes a static component and a rotatable component arranged concentrically, the static component including a first number of radially extending ports and the rotatable component having a second number of radially extending ports the radially extending ports arranged in a common circumferential plane wherein the ports are configured and arranged, in use, to homogenize a flow area for a fluid being transferred through the ports and thereby create a homogenous volume flow.

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1. A transfer coupling comprising a static component and a rotatable component arranged in co-axial alignment, the static component including a first number of ports and the rotatable component including a second number of ports, the ports arranged in a common circumferential plane wherein the ports

1. A transfer coupling comprising a static component and a rotatable component arranged in co-axial alignment, the static component including a first number of ports and the rotatable component including a second number of ports, the ports arranged in a common circumferential plane wherein the ports are configured and arranged, in use, to homogenise a flow area for a fluid being transferred through the ports and thereby create a homogenous volume flow, wherein each of the static and rotatable components is provided with ports which are elongate slots, the slots on a first of the components are all arranged with their main axis inclined to the co-axis of the components at a first angle and the slots on the second of the components are all arranged with their main axis inclined to the co-axis of the components at a second angle, different from the first angle. 2. A transfer coupling as claimed in claim 1 wherein the static component and rotatable component are concentrically arranged and the first and second number of ports extend radially. 3. A transfer coupling as claimed in claim 1 wherein the static component and rotatable component are arranged axially adjacent to each other and the ports extend axially. 4. A transfer coupling as claimed in claim 1 wherein each of the static and rotating components have a circumferential wall comprised substantially of a porous material. 5. A transfer coupling as claimed in claim 1 wherein the first and second angle are equal but opposite in sign. 6. A transfer coupling as claimed in claim 1 wherein a first of the static component and the rotatable component comprises a circumferential channel and the second of the components comprises a circumferential array of similar sized ports equally spaced along the circumference in one or more rows. 7. A transfer coupling as claimed in claim 1 wherein each of the static and rotatable components comprises a web consisting of a pair of equal diameter, coaxially aligned annuli connected by a plurality of axially extending, equally spaced struts defining spaces and in a circumferential direction, the struts have a smaller dimension than the spaces. 8. A transfer coupling as claimed in claim 7 wherein the dimension of the struts is less than half of the dimension of the spaces. 9. A transfer coupling as claimed in claim 1 wherein the packing factor of ports on at least one of the components is 50% or greater. 10. A transfer coupling according to claim 1 wherein the packing factor of ports is equal to +/−20% of 50%. 11. A transfer coupling as claimed in claim 1, wherein the first of the components is the static component and the static component sits radially outboard of the rotatable component. 12. A transfer coupling as claimed in claim 1, wherein the ports on one of the components are of consistent shape and size. 13. A transfer coupling as claimed in claim 1, wherein the ports on one or both components are arranged at an incline to the radius of the component. 14. A planetary gear box, wherein a rotating shaft of the planetary gear box is coupled to a radially outboard static housing by a coupling in accordance with claim 1. 15. A gas turbine engine having a planetary gear box of the form recited in claim 14.