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A blade for use in a gas turbine engine has an airfoil and a dovetail. The airfoil extends radially outwardly of the dovetail. An inner surface of the dovetail includes a slot extending along a length of the dovetail between a leading edge and a trailing edge. A rotor and a gas turbine engine are al

A blade for use in a gas turbine engine has an airfoil and a dovetail. The airfoil extends radially outwardly of the dovetail. An inner surface of the dovetail includes a slot extending along a length of the dovetail between a leading edge and a trailing edge. A rotor and a gas turbine engine are also disclose.

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1. A blade for use in a gas turbine engine comprising: an airfoil and a dovetail, said airfoil extending radially outwardly of said dovetail;an inner surface of said dovetail including a slot extending along a length of said dovetail between a leading edge and a trailing edge;wherein circumferential

1. A blade for use in a gas turbine engine comprising: an airfoil and a dovetail, said airfoil extending radially outwardly of said dovetail;an inner surface of said dovetail including a slot extending along a length of said dovetail between a leading edge and a trailing edge;wherein circumferential ends of said slot being formed on a compound curve; andwherein said compound curve includes two circumferentially outer curve portions each formed at a first radius of curvature, and a circumferentially central portion formed of a second radius of curvature with said second radius of curvature being greater than said first radius of curvature. 2. The blade as set forth in claim 1, wherein said airfoil, said dovetail, and said slot curve between said leading edge and said trailing edge. 3. The gas turbine engine as set forth in claim 1, wherein said airfoil, said dovetail, and said slot extend generally parallel between said leading edge and said trailing edge. 4. The blade as set forth in claim 1, wherein said dovetail extends circumferentially outwardly from said airfoil beginning at root fillet runouts, and a first distance defined between an opposed pair of said root fillet runouts, and a width defined between circumferential edges of said slot at said inner surface, and said width being less than said first distance. 5. The blade as set forth in claim 1, wherein axial ends of said slot at both said leading and trailing edges curve into axial ends of said dovetail. 6. The blade as set forth in claim 1, wherein said blade is for use in a fan. 7. A rotor comprising: a rotor body having at least one rotor slot for receiving a blade;the blade having an airfoil and a dovetail, said airfoil extending radially outwardly of said dovetail, an inner surface of said dovetail including a slot extending along a length of said dovetail between a leading edge and a trailing edge;wherein circumferential ends of said slot being formed on a compound curve; andwherein said compound curve includes two circumferentially outer curve portions each formed at a first radius of curvature, and a circumferentially central portion formed of second radius of curvature with said second radius of curvature being greater than said first radius of curvature. 8. The rotor as set forth in claim 7, wherein said airfoil, said dovetail, and said slot curve between said leading edge and said trailing edge. 9. The rotor as set forth in claim 7, wherein said airfoil, said dovetail, and said slot extend generally parallel between said leading edge and said trailing edge. 10. The rotor as set forth in claim 7, wherein said dovetail extends circumferentially outwardly from said airfoil beginning at root fillet runouts, and a first distance defined between an opposed pair of said root fillet runouts, and a width defined between circumferential edges of said slot at said inner surface, and said width being less than said first distance. 11. The rotor as set forth in claim 7, wherein axial ends of said slot at both said leading and trailing edges curve into axial ends of said dovetail. 12. The rotor as set forth in claim 7, wherein a spacer is positioned within said rotor slot radially inwardly of said dovetail, and said spacer having a portion extending radially outwardly and into said slot in said dovetail. 13. A gas turbine engine comprising: a fan, a compressor and a turbine, at least one of said fan and said compressor having a rotor and the rotor including a rotor body having at least one rotor slot receiving a blade;the blade having an airfoil and a dovetail, said airfoil extending radially outwardly of said dovetail at an inner surface of said dovetail including a slot extending along a length of said dovetail between a leading edge and a trailing edge;wherein circumferential ends of said slot being formed on a compound curve; andwherein said compound curve includes two circumferentially outer curve portions each formed at a first radius of curvature, and a circumferentially central portion formed of second radius of curvature with said second radius of curvature being greater than said first radius of curvature. 14. The gas turbine engine as set forth in claim 13, wherein said airfoil, said dovetail, and said slot curve between said leading edge and said trailing edge. 15. The gas turbine engine as set forth in claim 13, wherein said airfoil, said dovetail, and said slot extend generally parallel between said leading edge and said trailing edge. 16. The gas turbine engine as set forth in claim 13, wherein said dovetail extends circumferentially outwardly from said airfoil beginning at root fillet runouts, and a first distance defined between an opposed pair of said root fillet runouts, and a width defined between circumferential edges of said slot at said inner surface, and said width being less than said first distance. 17. The gas turbine engine as set forth in claim 13, wherein axial ends of said slot at both said leading and trailing edges curve into axial ends of said dovetail. 18. The gas turbine engine as set forth in claim 13, wherein said blade is for use in a fan. 19. The gas turbine engine as set forth in claim 13, wherein a spacer is positioned within said rotor slot radially inwardly of said dovetail, and said spacer having a portion extending radially outwardly and into said slot in said dovetail. 20. The gas turbine engine as set forth in claim 17, wherein said turbine drives said fan through a gear reduction.