43 55 47 57 of the keys must be angled to allow at least one assembly direction and they may be angled to allow only one assembly direction by using a dovetail geometry fig1 is perspective rear view of an airfoil with both pressure side trailing edge ramps 45 and suction side trailing edge ramps 64 these ramps eliminate the need for the filler 60 shown in fig8 and 11 fig1 is a sectional top view taken on a plane through a pressure side key 46 f of fig1 fig1 15 illustrate an embodiment in which the leading edge keyways 82 are holes in an inwardly extending flap 80 of the suction side part 52 the trailing edge keyways 84 are holes in the trailing edge of the suction side part 52 the leading edge keys 72 of the pressure side part 42 are inserted into the leading edge keyways 82 the trailing edge keys 76 of the pressure side part 42 are inserted into the trailing edge keyways 84 the leading and trailing edge keyways and keys may be all aligned in substantially the same direction d allowing assembly in that direction surface continuity flaps 74 may be provided between the leading edge keys 72 on the pressure side part 42 likewise surface continuity flaps 78 may be provided between the trailing edge keys 76 on the pressure side part 42 ceramic filler may be applied between the continuity flaps to provide an aerodynamically smooth surface over the joints alternately the continuity flaps may not be provided and ceramic or cmc filler alone may fill and smooth the indents caused by the joints the keys keyways and ramps herein may be formed by machining the cmc.