Retention washers, propeller retention systems, and related methods

A method of propeller retention, the method comprising:

• applying a nut onto a stud within a predetermined range of a prescribed installation torque, wherein the nut and the stud retain a propeller assembly on a shaft;
• and
• positioning a retention washer with respect to the nut such that a hole of the retention washer circumscribes the nut, thereby limiting rotation of the nut with respect to the stud and maintaining the nut at a torque within the predetermined range of the prescribed installation torque, wherein the positioning the retention washer comprises translating the retention washer axially along a longitudinal axis of the stud, and wherein the retention washer comprises:
• a washer body, comprising:
• a first side;
• and
• a second side opposite the first side, wherein the washer body has a perimeter having at least a first lobe, a second lobe, and a third lobe, wherein the perimeter has a first radius of curvature corresponding to the first lobe, wherein the perimeter has a second radius of curvature corresponding to the second lobe, and wherein the perimeter has a third radius of curvature corresponding to the third lobe;
• and
• the hole extending through the washer body from the first side to the second side, wherein the hole is a multi-point star-shaped hole, wherein the retention washer maintains an installation torque of the nut via engagement between the hole and the nut when the retention washer is positioned such that the hole circumscribes the nut, wherein a center point of the hole is closer to a first center of the first radius of curvature of the perimeter than to a second center of the second radius of curvature or to a third center of the third radius of curvature, and wherein the retention washer is selectively removable from the nut to facilitate selective removal of the nut, and wherein the retention washer is selectively replaceable after selective removal.