Marine propulsion – Screw propeller – With means effecting or facilitating movement of propulsion...
Patent
1988-02-26
1988-12-13
Peters, Jr., Joseph F.
Marine propulsion
Screw propeller
With means effecting or facilitating movement of propulsion...
440 75, 440 81, 416128, B63H 2126
Patent
active
047907827
ABSTRACT:
A marine stern drive for a boat (3) includes a propeller assembly (36) having a carrier (13) for a pair of concentric drive shafts (12, 19) to which are mounted a pair of closely adjacent fore and aft coaxial surface piercing propellers (21, 22) mounted on a common axis. The carrier also includes a downwardly extending skeg (31). The shafts are connected to a source of power (5) and drive the propellers in contra-rotating relationship at essentially equal rotational velocities. The carrier is connected to devices (39-41) for swinging the carrier laterally for steering, and also vertically. A control (45) is provided for positioning and maintaining the carrier vertically such that both contra-rotating propellers are continuously disposed in surface piercing position during normal operation of the drive. The result is that lateral forces created on the propeller carrier by one rotating surface piercing propeller are counterbalanced by the other propeller when the skeg is parallel to the boat centerline (4). The leading edges (32, 33) of both propellers are relatively sharp for surface piercing, while the training edges (33, 34) of both propellers are relatively blunt.
REFERENCES:
patent: 479008 (1892-07-01), Lowe
patent: 2337376 (1943-12-01), Micelis
patent: 3057320 (1962-10-01), Daniels
patent: 3430603 (1969-03-01), Parish
patent: 3933116 (1976-01-01), Adams et al.
patent: 4529387 (1985-07-01), Brandt
patent: 4544362 (1985-10-01), Arneson
patent: 4565532 (1986-01-01), Connor
patent: 4600395 (1986-07-01), Pichl
patent: 4619584 (1986-10-01), Brandt
Brunswick Corporation
Peters Jr. Joseph F.
Sotelo Jesus D.
LandOfFree
Balanced marine surfacing drive does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Balanced marine surfacing drive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Balanced marine surfacing drive will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2194402