202 having a length 204 and a width 206 the base portion 202 terminates along one side thereof in an edge 208 which engages the inner periphery 58 of the mixer drum 22 when the flight 200 is mounted in the mixer drum 22 a plurality of holes 210 are formed adjacent the edge 208 such that the flight 200 can be mounted within the mixer drum 22 in the same manner that the flights 130 and 170 are mounted therein opposite the edge 208 the type iii flight 200 is bent at substantially a right angle to form a riser portion 212 having a preselected width 214 it is noted that the length of the riser portion 212 is substantially the same as the length 204 of the base portion 202 so that the length 204 defines the length of the flight 200 accordingly the length 204 will sometimes be referred to herein as the length of the flight 200 the low density flight assemby 88 fig2 is constructed of a plurality of type i flights 130 and type ii flights 170 mounted within the first drying zone 84 as illustrated in fig2 and 3 the base portions 132 of the flights 130 are attached to the inner periphery 58 of the mixer drum 22 and extend therefrom substantially perpendicularly as illustrated in fig2 the lengths 134 of the flights 130 are selected such that the flights extend along the inner periphery 58.