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A hub for mounting propeller blades has a plurality of mount locations for receiving propeller blades at a radially outer location. The hub has a piloting diameter centered on a center axis. The hub has a plurality of openings to receive a drive member for transmitting rotation/torque from an adapte

A hub for mounting propeller blades has a plurality of mount locations for receiving propeller blades at a radially outer location. The hub has a piloting diameter centered on a center axis. The hub has a plurality of openings to receive a drive member for transmitting rotation/torque from an adapter. There are reliefs cut into the piloting diameter at locations circumferentially aligned with the openings.

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1. A hub for mounting propeller blades comprising: a hub having a plurality of mount locations for receiving propeller blades at a radially outer location, and having a piloting diameter centered on a center axis, said hub having a plurality of openings to receive connection members for transmitting

1. A hub for mounting propeller blades comprising: a hub having a plurality of mount locations for receiving propeller blades at a radially outer location, and having a piloting diameter centered on a center axis, said hub having a plurality of openings to receive connection members for transmitting rotation/torque from an adapter, and there being reliefs cut into the piloting diameter at locations circumferentially aligned with said openings; andwherein there are transition blends at each of two circumferential ends of said reliefs, which transitions said reliefs into said piloting diameter. 2. The hub as set forth in claim 1, wherein said relief having a nominal relief portion at a nominal diameter which is greater than said piloting diameter, and a ratio of said nominal diameter to said piloting diameter being between 1.0014 and 1.0043. 3. The hub as set forth in claim 2, wherein said transition blends are formed at a transition radius, and a ratio of said nominal diameter to said transition radius being between 7.6871 and 7.8626. 4. The hub as set forth in claim 3, wherein a relief angle is defined, which includes said transition blends and said nominal relief portion, and said relief angle being between 48.18 and 52.18 degrees. 5. The hub as set forth in claim 4, wherein said transition blends extend across a transition angle, and said transition angle being between 5.25 and 9.25 degrees. 6. The hub as set forth in claim 5, wherein said openings have a circumferential extent measured from a center axis of said hub for an opening angle, and said opening angle being between 11.45 and 11.48 degrees. 7. The hub as set forth in claim 6, wherein a ratio of said relief angle to said opening angle being between 4.197 and 4.557. 8. A system comprising: a hub mounting a plurality of propeller blades;an adaptor for securing said hub to a drive shaft;said hub and said adaptor having a plurality of openings circumferentially aligned, connecting members extending through said opening, and each of said hub and said adaptor having a piloting diameter centered on a center axis, with one of said piloting diameters being on a radially outer surface and the other of said piloting diameters being on a radially inner surface, and there being reliefs cut into at least one of said piloting diameters at location circumferentially aligned with said openings; andwherein there are transition blends at each of two circumferential ends of said reliefs which transitions said reliefs into said piloting diameter. 9. The system as set forth in claim 8, wherein said hub having a piloting diameter on said inner peripheral surface and said adaptor having said piloting diameter on said outer peripheral surface. 10. The system as set forth in claim 9, wherein said reliefs are cut into said piloting diameter on said inner peripheral surface of said hub. 11. The system as set forth in claim 10, wherein said relief having a nominal relief portion at a nominal diameter which is greater than said piloting diameter, and a ratio of said nominal diameter to said piloting diameter being between 1.0014 and 1.0043. 12. The system as set forth in claim 11, wherein said transition blends are formed at a transition radius, and a ratio of said nominal diameter to said transition radius being between 7.6871 and 7.8626. 13. The system as set forth in claim 12, wherein a relief angle is defined which includes said transition blends and said nominal relief portion, and said relief angle being between 48.18 and 52.18 degrees. 14. The system as set forth in claim 13, wherein said transition blends extend across a transition angle, and said transition angle being between 5.25 and 9.25 degrees. 15. The system as set forth in claim 14, wherein said openings have a circumferential extent measured from a center axis of said hub for an opening angle, and said opening angle being between 11.45 and 11.48 degrees. 16. The system as set forth in claim 15, wherein a ratio of said relief angle to said opening angle being between 4.197 and 4.557.