Propeller assembly including a rigging free beta tube

An apparatus comprising:

• a blade;
• a propeller shaft coupled to the blade, the propeller shaft including a first gallery and a second gallery, the first and second galleries fluidly coupled to a pump via one or more control valves;
• and
• a beta tube rotationally fixed to the propeller shaft, the beta tube axially translating with respect to the propeller shaft, the beta tube including a first connection and a second connection, the first connection to provide hydraulic fluid to a first pitch chamber to adjust a pitch of the blade to a first pitch angle, the second connection to provide hydraulic fluid to a second pitch chamber to adjust the pitch of the blade to a second pitch angle, the first connection fluidly coupled to the first gallery of the propeller shaft based on a position of the beta tube, the second connection fluidly coupled to the second gallery of the propeller shaft.

An engine comprising:

• a low pressure shaft;
• a propeller assembly including a blade and a propeller shaft, the propeller shaft including a first gallery and a second gallery;
• a gearbox to translate a first rotation of the low pressure shaft into a second rotation of the propeller shaft, the blade to rotate with the second rotation;
• and
• a beta tube rotationally fixed to the propeller shaft, the beta tube axially translating with respect to the propeller shaft, the beta tube including a first connection and a second connection, the first connection to provide hydraulic fluid to a first pitch chamber to adjust a pitch of the blade to a first pitch angle, the second connection to provide hydraulic fluid to a second pitch chamber to adjust the pitch of the blade to a second pitch angle, the first connection fluidly coupled to the first gallery of the propeller shaft based on a position of the beta tube, the second connection fluidly coupled to the second gallery of the propeller shaft.