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US 9,701,379 B2Granted
Propeller incorporating a secondary propulsion system
OwnerRussel Ian Hawkinsinventor
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Abstract
THIS invention relates to a propeller and more particularly, but not exclusively, to a propeller for use with inboard and outboard boat engines. The propeller includes a hollow hub and a plurality of primary blades extending substantially radially outwardly from the hub, with each primary blade including a blade face, a blade back and a root section. The propeller is characterized in that a set of secondary blades are provided inside the hub, and that an inner volume of the hub is in flow communication with a volume radially outwardly of the propeller hub.
Claims11
A propeller including:
- a hub which is hollow;
- a plurality of primary blades extending substantially radially outwardly from the hub, with each primary blade including a blade face, a blade back and a root section;
- wherein an inner volume of the hub is in flow communication with a volume radially outwardly of the hub;
- a set of secondary blades located on a hub insert which fits inside the hub, wherein an annular volume is formed between an inner surface of the hub and an outer surface of the hub insert, with the secondary blades disposed inside the annular volume;
- and
- tertiary blades which extend from the hub insert,
- with each tertiary blade located between two adjacent secondary blades in order for the secondary blades and the tertiary blades to divide the annular volume between the hub and the insert into alternating water and exhaust gas flow passages.
4 more elements
Dependencies are inferred from the claim text.