US1086274A - Propeller for ships. - Google Patents

Propeller for ships. Download PDF

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Publication number
US1086274A
US1086274A US60387511A US1911603875A US1086274A US 1086274 A US1086274 A US 1086274A US 60387511 A US60387511 A US 60387511A US 1911603875 A US1911603875 A US 1911603875A US 1086274 A US1086274 A US 1086274A
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Prior art keywords
propeller
angle
ships
axis
cathetus
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Expired - Lifetime
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US60387511A
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Giovanni Cardosa
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form

Definitions

  • GIOVANNI CARDOSA OF VENICE, ITALY, ASSIGNOR OF ONE-HALF TO NICOLO SPADA OF VENICE, ITALY;
  • the present invention relates to improvements in propellers for ships with flat blades which form with the axis of the propeller an angle of about 45 and whose parallel entrant and exit edges form an angle of 45 or closeto 45 with the perpendicular line to the axis which passes through the plane of the blade.
  • the improvement whichIhave introduced in these propellers has for its object to construct an eflicient propeller with the angle between the blades and the axis of-the propeller other than 45.
  • this'angle may be varied and may even exceed 80, and its value is given geometrically by the angle which will be formed in the right angle triangle by the hypotenuse and a cathetus which is equal to the theoretical advance of the propeller, the other cathetus of this triangle being equal to twice the diameter of the said propeller. r,
  • a propeller constructed according to the present invention may be used also with mo tors of great power and with a relatively large number of revolutions. It is well known that when the number of revolutions 'of a motor with a given power is increased,
  • axis of the propeller is 45, it would be an ang necessary, in order to obtain the required small theoretical advance, to vary the diameter of the propeller and therefore, to diminish the power employed, as the angle between the blades and the axis of the propeller may not be altered.
  • Figure 1 represents a blade whose plane is parallel to the plane of the aper
  • Fig. 2 is a projection of the blade
  • Fig. 3 shows diagrammatically the geometrical construction of the angle between the blade and the axis of the propeller.
  • dare-two blades which have two sides m and n parallel to each other and an' extremity p, preferably curved.
  • the angle between the blades and the axis of the propeller is the angle between the blades and the axis of the propeller and may have any value up to and even exceeding 80. It is formed by the hypotenuse O B and the cathetus C A of a right angle triangle, said cathetus being equal to the theoretical advance of the propeller, while the other cathetus is equal to twice the diameter of the propeller.
  • this angle being given geometrically by the angle formed in a' right angle triangle-by the hypotenuse and a cathetus equal to the theoretical advance of the ropeller, the second cathctus of this t-riang e being equal to twice the diameter of the said propeller.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Prostheses (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Description

G. GARDOSA.
PROPELLER FOR SHIPS.
APPLICATION FILED JAN. 21, 1911.
1,086,274,- Patented Feb. 3, 1914.
' jmrah G. Caz-(dam UNITED STATES PATENT oFnIoE.
GIOVANNI CARDOSA, OF VENICE, ITALY, ASSIGNOR OF ONE-HALF TO NICOLO SPADA OF VENICE, ITALY;
raorannnn 'ron snr'rs,
Specification of Letters ratent.
Patented Feb. 3, 1914,
To all whom it may concern:
Be it known that I, GIOVANNI CAnnosA, a subject of the King of Italy, and residing at S. Maria del Giglio, Venice, Italy, have invented certain new and useful Improvements in Propellers for Ships, of which the following is a specification, reference being had therein to the accompanying drawing.
The present invention relates to improvements in propellers for ships with flat blades which form with the axis of the propeller an angle of about 45 and whose parallel entrant and exit edges form an angle of 45 or closeto 45 with the perpendicular line to the axis which passes through the plane of the blade.
The improvement whichIhave introduced in these propellers has for its object to construct an eflicient propeller with the angle between the blades and the axis of-the propeller other than 45. According to this invent-ion, this'angle may be varied and may even exceed 80, and its value is given geometrically by the angle which will be formed in the right angle triangle by the hypotenuse and a cathetus which is equal to the theoretical advance of the propeller, the other cathetus of this triangle being equal to twice the diameter of the said propeller. r,
A propeller constructed according to the present invention may be used also with mo tors of great power and with a relatively large number of revolutions. It is well known that when the number of revolutions 'of a motor with a given power is increased,
axis of the propeller is 45, it would be an ang necessary, in order to obtain the required small theoretical advance, to vary the diameter of the propeller and therefore, to diminish the power employed, as the angle between the blades and the axis of the propeller may not be altered.
The improved propeller is shown in the accompanying drawings in which:
Figure 1 represents a blade whose plane is parallel to the plane of the aper, Fig. 2 is a projection of the blade an Fig. 3 shows diagrammatically the geometrical construction of the angle between the blade and the axis of the propeller.
. 0 and dare-two blades which have two sides m and n parallel to each other and an' extremity p, preferably curved.
B is the angle between the blades and the axis of the propeller and may have any value up to and even exceeding 80. It is formed by the hypotenuse O B and the cathetus C A of a right angle triangle, said cathetus being equal to the theoretical advance of the propeller, while the other cathetus is equal to twice the diameter of the propeller.
What I claim is:
A propeller for ships with flat blade whose parallel entrant and exit edges form pendicular line to the axis which passes through the plane of the blade, and in which the blades form with the axis of the propeller an angle of up to or exceeding 80,
this angle being given geometrically by the angle formed in a' right angle triangle-by the hypotenuse and a cathetus equal to the theoretical advance of the ropeller, the second cathctus of this t-riang e being equal to twice the diameter of the said propeller.
In witness whereof I, said GIOVANNI CAR- DOSA, have signed this specification at Rome in the Kingdom of Italy this 7th day of January, 1911.
GIOVANNI CARDOSA. In the presence of two witnesses:
LOBBORUTI FuANoEsIo, VALENTI ARMANOLO.
e of 45 or close to 45 with the per-
US60387511A 1911-01-21 1911-01-21 Propeller for ships. Expired - Lifetime US1086274A (en)

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US60387511A US1086274A (en) 1911-01-21 1911-01-21 Propeller for ships.

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014534A (en) * 1957-04-16 1961-12-26 Enso Gutzeit Oy Impeller, propeller and the like for producing axial effect, particularly axial air flow
US3266578A (en) * 1965-01-06 1966-08-16 William J Mcneil Propellers for boats and ships
USD380539S (en) * 1996-05-14 1997-07-01 Sheng Yuan Electric Co., Ltd. Combined ceiling fan and light
US20050175458A1 (en) * 2002-08-30 2005-08-11 Romero Vazquez Juan J. Propeller, propeller propulsion system and vessel comprising propulsion system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014534A (en) * 1957-04-16 1961-12-26 Enso Gutzeit Oy Impeller, propeller and the like for producing axial effect, particularly axial air flow
US3266578A (en) * 1965-01-06 1966-08-16 William J Mcneil Propellers for boats and ships
USD380539S (en) * 1996-05-14 1997-07-01 Sheng Yuan Electric Co., Ltd. Combined ceiling fan and light
US20050175458A1 (en) * 2002-08-30 2005-08-11 Romero Vazquez Juan J. Propeller, propeller propulsion system and vessel comprising propulsion system

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