Patent ID: 11873075
Assignee: ATHULE AERO TECHNOLOGIES, INC.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A propeller blade configured to be coupled to a hub of a propeller, the blade having a blade length from a center of the hub to a blade tip at a distal end of the blade from the hub, comprising:
a loaded zone configured to produce lift; and
an unloaded tip zone having a nonzero length of at least 3% of the blade length and configured to produce a zero or less lift coefficient for the unloaded tip zone;
wherein a lift coefficient of the propeller blade has a positive value in the loaded zone and changes starting at a first location along the blade length to an increasingly negative slope relative to an increasing distance along the blade length and changes to an increasingly positive slope at a second location at a greater distance along the blade length than the first location to produce a non-positive lift coefficient for the unloaded tip zone.