Abstract: An arrangement in connection with an azimuth propeller for ships to measure the angle between the rotational axis of the propeller and the longitudinal axis of the ship (azimuth angle), and the angle of attack of the propeller blades. The azimuth propeller comprises a first housing (1) which is firmly connected with the ship, and a second housing (2) which is rotatably mounted in first housing (1). A first drive shaft (6) extends through the first housing and is connected with a drive shaft (11) of a propeller (13) with variable pitch blades (14), said drive shaft extending at an angle to the first drive shaft. A first rod (31) extends through propeller shaft (11) and is in connection with the propeller blades and is movable with them.

Abstract: An improvement in a variable pitch propeller to allow replacement of propeller blades under water without water intruding into the mechanism in the propeller hub and without a substantial quantity of oil leaking to the surrounding water. The propeller comprises a number of turnable propeller blades (2) which are each removably attached to a rotatable crank disk (3) and for each propeller blade there is provided a first seal (5) between the hub (1) and the propeller blade root (2a), a second seal (6) between the hub (1) and the crank disk (3) and a by-pass valve (7) passing the second seal (6). the valve (7) is spring biased to remain in a closed position when the propeller blade (2) is removed. When the propeller blade (2) is secured in place the first seal (5) is operative and when the propeller blade is removed, the second seal (6) is the operative one together with the valve (7).