A variable pitch screw propeller, wherein the blade root is screwed into a threaded sleeve, the latter at its base, has secured thereto a flanged annular member, the sleeve portion of which is of smaller diameter than the root carrying the thread and acts as a journal for a foot bearing. The blade It is screwed at its root m and has secured thereto a sleeve n which carries a worm‐wheel 0 for the pitch‐actuating gear, and also a flange for supporting the thrust nice i. At its base, there is secured by screws u a flanged member t the sleeve portion s of which forms a support for a foot bearing r. A hard sleeve x may be disposed between the blade root extension and the sleeve s.
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