New propeller designed to increase the speed of ships
Item
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Title (Dublin Core)
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New propeller designed to increase the speed of ships
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Article Title and/or Image Caption (Dublin Core)
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Will This Invention Increase the Ship's Propeller Efficiency?
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extracted text (Extract Text)
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TO increase the efficiency of the ship's
propeller, it is suggested by an in-
ventor to place a smaller propeller, but
with a steeper pitch, in front of the usual
propeller, and on the same shaft. The
smaller radius of the auxiliary screw com-
pensates for the greater pitch, reducing
the resistance to the screw.
The inventor of this double propeller
claims that the auxiliary screw causes a
better utilization of the engine's power.
The small screw placed in front of the
usual propeller acts upon the water
near the shaft, where the larger screw
exerts but little power. He contends
that the addition of the smaller screw
will not increase the burden placed upon
the engine of the ship, and that, with the
same motive force, it will add from 25
to 30 per cent. to the driving power of
the propeller.
There is no doubt that the addition of
another screw of greater pitch would in-
crease the driving power of the propeller
agreat deal,
but it is by
no means
clear how
this can be
produced
without
adding to
the burden
of the ship's
engines.
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Contributor (Dublin Core)
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Publisher's Photo Service (Image copyright)
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Language (Dublin Core)
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eng
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Date Issued (Dublin Core)
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1919-01
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pages (Bibliographic Ontology)
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15
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Rights (Dublin Core)
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Public domain (Google digitized)
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Archived by (Dublin Core)
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Davide Donà
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Marco Bortolami (editor)
Popular Science Monthly, v. 94, n. 1, 1919
