Abstract: A surface type structural component such as a wing for an aircraft is curved in space and is manufactured from a plurality of fiber wound box frames forming longitudinal and cross ribs made of fiber reinforced resin impregnated material. These box frames are formed as modular units by winding the fiber compound material onto mold bodies and assembling the mold bodies for bonding the box frames together to form a reinforcing grid structure while the box frames are still on the mold bodies. A laminated sheathing is bonded to the grid structure. Methods and apparatus including an automated assembly plant are disclosed for manufacturing the surface type structural component.

Abstract: A suspension of solid particles in a liquid is produced and maintained by riodically moving agitating elements up and down in an elongated, flat bottom container. The agitating elements may, for example, be baffle plates, grids or the like, which are moved up and down either in a linear or in an angular movement. Preferably, two sets of agitating members are arranged so as to pass through each other in their periodic up and down movements. A carriage having mounted thereon a pump and a spray nozzle is movable alongside the elongated container with an intake of the pump reaching into the container without interfering with the moving agitating elements.