DIVER-PROPULSION UNITS

摘要

A diver-propulsion unit (1) has a two-part cylindrical casing (2,3) with hand-grips (9) either side for holding forwardly of the swimming diver and giving manoeuvrability. Propulsion- thrust is from a propeller (15) rotating within a cylindrical duct (14) of a nozzle-mount (11) to which the casing-parts (2,3) are clamped. The propeller (15) is driven via a belt-drive (25,26) by an electric motor (22) which is mounted on the nozzle-mount (11) outside the duct (14) and which is powered by batteries in externally-projecting pods (31) of the rear casing-part (3). The belt-drive (25,26) extends across the water-flow to the duct (14) within a channel (29) of the nozzle-mount (11). The channel (29) is closed by a radial cover-shell (6) of the front casing-part (2), and a fairing (30) of the casing-part (2) projects into a cylindrical rim (13) of the nozzle-mount (11) to establish a flow-path of reducing cross-sectional area into the duct (14). Location of the motor (22) peripherally of the casing (2,3) and its batteries in projecting pods (31) facilitates their cooling by water external to the casing (2,3).