Contra-rotating marine drive working at the surface and having a defined X-dimension (vertical dimension)

摘要

In a marine drive 10 having two counter-rotating surface operating propellers 12 and 14 driven from an engine drive shaft 32 via a universal joint 30, gearing and shafts 28, 36, 156, 158, the drive has a vertical X-dimension 254, i.e. the distance between the axis of rotation of shaft 32 and the plane 256 of the bottom of the boat 18, in the range of about 13 inches to 19 inches in combination with a shaft-spacing dimension 258 in the range of about 8 inches to 15 inches and a surfacing dimension 26A