the resin is type 510a 40 derakane u2122 manufactured by the dow chemical company of channahon ill mandrel 22 is clamped generally horizontally between a rotating chuck and a tailstock spindle of a filament winding machine and rotates at a selectable constant rate a two axis machine specifically u201c basic production series model wbp u201d manufactured by mcclean anderson corp of schofield wis is used to apply a matrix of fibers and resin under controlled tension to the mandrel in a predetermined geometrical pattern continuous strands of fiber filament ribbon unwound from a plurality of contiguous spools and paid out from a pivotable payout eye mounted on a base that rides on a carriage are passed through an impregnating resin bath before being wound onto the mandrel the base moves along a crossfeed axis in reciprocal directions perpendicular to the axis of mandrel rotation similarly the carriage moves in reciprocal directions along a translational axis that is parallel to the axis of mandrel rotation in order to properly wind the filaments in a pattern that precisely covers the mandrel movements along the translational and crossfeed axes as well as pivoting of the payout eye must all be coordinated with respect to one another and with the mandrel rotation the machine can be programmed to do either circumferential or helical winding helical winding is always used in duct fabrication because it provides rigidity and structural strength winding parameters for a helical pattern are input to a software package u201c patternmaster ii u201d u2122 which outputs a list of feasible patterns a desired pattern is then specified by manually inputting.