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A bladed rotor features a tiered interface between each blade40and its respective slot16in a rotor hub12.Ideally the interface is a tiered spacer58that occupies the hub slot radially inboard of the blade attachment44.The spacer ensures a tight fit to resist windmilling induced wear. The tiered chara

A bladed rotor features a tiered interface between each blade40and its respective slot16in a rotor hub12.Ideally the interface is a tiered spacer58that occupies the hub slot radially inboard of the blade attachment44.The spacer ensures a tight fit to resist windmilling induced wear. The tiered character of the spacer reduces the risk of damage during blade installation and removal. The spacer also helps to transmit axial loads to a snap ring, which is one component of a blade axial retention system, during a blade separation event.

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1. A bladed rotor, comprising: a rotor hub having peripheral slots, each slot having a floor and extending a length L; a plurality of blades, each blade having an attachment occupying one of the slots, each attachment having a base surface; and a tiered interface between each blade and the f

1. A bladed rotor, comprising: a rotor hub having peripheral slots, each slot having a floor and extending a length L; a plurality of blades, each blade having an attachment occupying one of the slots, each attachment having a base surface; and a tiered interface between each blade and the floor of its respective slot, the tiered interface comprising at least one pair of contacting surfaces such that the contacting surfaces of each pair are in contact with each other along substantially the entire length L. 2. The bladed rotor of claim 1 comprising a spacer having an inner contact surface facing the slot floor and an outer contact surface facing the attachment base surface, the attachment base surface having steps and the outer contact surface having mating steps.3. The bladed rotor of claim 2 wherein at least one of the contact surfaces includes a pocket containing a compressible material.4. The bladed rotor of claim 1 comprising a spacer having an inner contact surface facing the slot floor and an outer contact surface facing the attachment base surface, the slot floor having steps and the inner contact surface having mating steps.5. The bladed rotor of claim 4, wherein the attachment base surface has steps and the outer contact surface has mating steps.6. The bladed rotor of claim 4 wherein at least one of the contact surfaces includes a pocket containing a compressible material.7. The bladed rotor of claim 1 wherein the hub is a fan hub of a turbine engine and the blades are fan blades.8. The bladed rotor of claim 1 wherein the peripheral slots and the attachment are curved.9. The bladed rotor of claim 1 wherein the tiered interface comprises a series of ramps.10. A spacer for occupying a space between a blade attachment and a disk slot floor in an assembled bladed rotor, the attachment having a slotwise length, the slot floor also having a slotwise length, the spacer having an outer contact surface intended to contact the attachment along substantially the entire attachment slotwise length and an inner contact surface intended to contact the slot floor along substantially the entire floor slotwise length, at least one of the contact surfaces being tiered. 11. The spacer of claim 10 wherein only the outer contact surface is tiered.12. The spacer of claim 11 wherein the spacer is curved.13. The spacer of claim 10 wherein the spacer is curved.14. The spacer of claim 10 wherein at least one of the contact surfaces includes a pocket containing a compressible material.15. A blade for a bladed rotor, the blade including an airfoil and an attachment, the rotor including a hub rotatable about a rotational axis and having a slot for receiving the attachment, the attachment having a base surface with at least two steps that face substantially in the radial direction when the blade is installed in the hub, the steps being distributed in a slotwise direction, wherein the slotwise direction is a substantially nonradial direction corresponding to the direction in which the attachment is into the slot. 16. The blade of claim 15 wherein the attachment is curved.17. The blade of claim 15 wherein the steps are of progressively graduated height.18. The blade of claim 17 wherein the graduated height increases from a proximal end of the attachment to a distal end of the attachment.