Angularly positioned marine propeller combination and a method of operating a marine propeller combination

A marine propulsion unit, comprising:

• a marine propeller combination and a drive leg supporting the marine propeller combination, wherein the marine propeller combination comprises a first propeller and a second propeller arranged to rotate simultaneously in opposite directions about a common rotational axis,
• the first propeller is adapted to be mounted on a first shaft of the marine propulsion unit and the second propeller is adapted to be mounted on a second shaft of the marine propulsion unit,
• the first propeller comprises a first propeller position feature for angularly mounting the first propeller on the first shaft,
• the second propeller comprises a second propeller position feature for angularly mounting the second propeller on the second shaft, and
• the first propeller position feature is a visual marking or shape irregularity and the second propeller position feature is a visual marking or shape irregularity,
• wherein the first propeller position feature and the second propeller position features are arranged on the first and second propellers such that the first and second propellers are angularly positioned on the first and second shaft, respectively such that during one revolution:
• one of a plurality of blades of the first propeller is aligned with a drive leg of a marine propulsion unit when a blade gap of the second propeller is aligned with the drive leg, or
• one of the plurality of blades of the first propeller is aligned with the drive leg when one of a plurality of blades of the second propeller is aligned with the drive leg.