rotor 36 carrying a plurality of compound blades 38 in dovetail slots 40 and extending radially therefrom each of the compound blades 38 includes a turbine blade 42 an arcuate platform segment 44 and a plurality of fan blades 46 in the illustrated example each compound blade 38 including the turbine blade 42 its platform segment 44 and the associated fan blades 46 is made as an integral component for example by casting forging machining or by fabrication e g welding brazing from sub components the compound blades 38 could also be built up as a mechanical assembly of individual components each of the turbine blades 42 is an airfoil having a leading edge 48 a trailing edge 50 a tip 52 a root 54 a convex suction side 56 and a concave pressure side 58 the turbine blades 42 are shaped to extract energy from the stream of pressurized gases exiting the core 20 to turn the rotor 36 depending upon the particular application the turbine blades 42 may be provided with internal channels not shown connected to a source of cooling air to lower their temperature each platform segment 44 extends away from the associated turbine blade 42 in axial and circumferential directions the platform segments 44 abut each other and collectively define an annular platform 60 interconnecting the tips 52 of the turbine blades 42 the fan blades 46 are grouped into circumferential arrays referred to as u201c rows u201d or u201c stages u201d a row 62 of first fan blades 46 a extends radially outward from the platform 60 each of the first fan blades 46 a is an airfoil having leading and.