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A friction device such as an aircraft wheel and brake assembly having a wheel member journaled for rotation on a fixed member, which fixed member supports a torque tube member. A plurality of primary friction disks are carried by splines on the wheel member while a plurality of secondary friction di

A friction device such as an aircraft wheel and brake assembly having a wheel member journaled for rotation on a fixed member, which fixed member supports a torque tube member. A plurality of primary friction disks are carried by splines on the wheel member while a plurality of secondary friction disks are carried by splines on the torque tube member with such secondary disks interleaved with the primary friction disks for axial movement towards one end of the torque tube. An actuator, such as a plurality of pistons, is mounted on the fixed member to urge all the friction disks into frictional engagement with each other and against a stationary disk on the one end of the torque tube. A rigid disk is positioned between the actuator and the pluralities of friction disks, and acts as a pressure plate. The rigid disk may be formed of carbon or ceramic composite material.

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A friction device such as an aircraft wheel and brake assembly having a wheel member journaled for rotation on a fixed member, which fixed member supports a torque tube member. A plurality of primary friction disks are carried by splines on the wheel member while a plurality of secondary friction di

A friction device such as an aircraft wheel and brake assembly having a wheel member journaled for rotation on a fixed member, which fixed member supports a torque tube member. A plurality of primary friction disks are carried by splines on the wheel member while a plurality of secondary friction disks are carried by splines on the torque tube member with such secondary disks interleaved with the primary friction disks for axial movement towards one end of the torque tube. An actuator, such as a plurality of pistons, is mounted on the fixed member to urge all the friction disks into frictional engagement with each other and against a stationary disk on the one end of the torque tube. A rigid disk is positioned between the actuator and the pluralities of friction disks, and acts as a pressure plate. The rigid disk may be formed of carbon or ceramic composite material. used and separated by a phase separator so that helium rich gas is directed into the Stirling engine and carbon dioxide rich fluid is directed through the heat pump. panel having a face surface, a back surface and a plurality of coolant holes where in the back surface of the panel faces and is spaced from the the interior surface of the support shell and defines therebetween a gap, wherein at least a portion of the back surface of the panel has a surface profile for improving the heat transfer properties of the liner segment with negligible increase in pressure drop across the combustor when compared to a flat back surface of the panel, wherein the surface profile comprises an array of surface features having a height A of less than 100 mils and a spacing B of greater than 10 mils. 2. A combustor according to claim 1, wherein the surface profile increases the surface area of the back surface of the panel by at least 50% compared to the flat back surface. 3. A combustor for a gas turbine engine comprising: a support shell having an exterior surface, an interior surface and a plurality of impingement coolant holes extending through the support shell between the exterior surface and the interior surface; at least one liner segment attached to the support shell, the liner segment comprising a panel having a face surface, a back surface and a plurality of coolant holes wherein the back surface of the panel faces and is spaced from the interior surface of the support shell and defines therebetween a gap, wherein at least a portion of the back surface of the panel has a surface profile for improving the heat transfer properties of the liner segment with negligible increase in pressure drop across the combustor when compared to a flat back surface of the panel, wherein the surface profile increases the surface area of the back surface of the panel to between 1.5 to 4.75 times compared to the flat back surface. 4. A combustor according to claim 1 or 3, wherein the heat transfer efficiency is increased at least 20% compared to the flat back surface. 5. A combustor according to claim 4, wherein the heat transfer efficiency is increased between 20% and 50% compared to the flat back surface. 6. A combustor according to claim 1 or 3, wherein the increase in pressure drop is less than 10% compared to the flat back surface. 7. A combustor according to claim 6, wherein the increase in pressure drop is less than 5% compared to the flat back surface. 8. A combustor according to claim 1, wherein the increase in surface area is between 1.5 to 4.75 times compared to the flat back surface. 9. A combustor according to claim 1 or 3, wherein the surface profile comprises an array of surface features selected from the group consisting of square-base pins, circular-base pins, square-base pyramids, circular base cones, tapered pins, pyramids with polygonal bases, frustums conical convex cones, concave cones, serpentine micro ribs, hemispheres, dimples and combinations thereof. 10. A combustor according to claim 3, wherein the surface profile comprises an array of surface features having a height A of less than 100 mils and a spacing B of greater than 10 mils. 11. A combustor according to claim 10, wherein height A is between 4 and 45 mils and spacing B is between 15 and 50 mils.