Spinnable Bladed Device For Operation In Air, Water Or Other Fluid Medium

Abstract

A device having a pair of blades spinnable about a spin axis. The pair of blades includes a first blade and a second blade, with the first blade canted about a first-blade canting axis at a first-blade canting angle and the second blade canted about a second-blade canting axis at a second-blade canting angle. The first-blade canting axis is oriented at a first-blade canting axis angle relative to a first-blade radial and the second-blade canting axis is oriented at a second-blade canting axis angle relative to a second-blade radial, each canting axis angle being other than 90 degrees. The first-blade radial is oriented perpendicular to a first chord plane that passes through the first blade and contains a first-blade chord, and the second-blade radial is oriented perpendicular to a second chord plane that passes through the second blade and contains a second-blade chord. The first-blade chord is oriented at a first-blade chord pitch angle determined at least in part by the first-blade canting axis angle and the first-blade canting angle. The second-blade chord is oriented at a second-blade chord pitch angle determined at least in part by the second-blade canting axis angle and the second-blade canting angle.

1 . A bladed device for operation in a fluid medium, the device comprising:
 a. at least one pair of blades, the pair of blades including a first blade and a second blade, wherein the pair of blades is spinnable about a spin axis, the spin axis being normal to a hub plane; wherein,   b. the first blade is canted about a first-blade canting axis at a first-blade canting angle, the first blade canting axis being within or parallel to the hub plane and the first-blade canting angle being an angle, within a plane perpendicular to the first-blade canting axis, between the hub plane and the first blade, the first-blade canting axis being oriented at a first-blade canting axis angle that is other than 90 degrees relative to a first radial; wherein,   c. the second blade is canted about a second-blade canting axis at a second-blade canting angle, the second blade canting axis being within or parallel to the hub plane and the second-blade canting angle being an angle, within a plane perpendicular to the second-blade canting axis, between the hub plane and the second blade, the second-blade canting axis being oriented at a second-blade canting axis angle that is other than 90 degrees relative to a second radial; wherein,   d. at least part of one of the first blade and the second blade is canted rearward of the hub plane, and at least part of the other one of the first blade and second blade is canted forward of the hub plane; wherein,   e. the first radial is perpendicular to a first chord plane wherein the first chord plane passes through the first blade and contains a first-blade chord, and the second radial is perpendicular to a second chord plane wherein the second chord plane passes through the second blade and contains a second-blade chord; wherein,   f. the first-blade chord is oriented at a first chord pitch angle, the first chord pitch angle being determined at least in part by the first-blade canting axis angle and the first-blade canting angle; and, wherein,   g. the second-blade chord is oriented at a second chord pitch angle, the second chord pitch angle being determined at least in part by the second-blade canting axis angle and the second-blade canting angle.   
     
     
         2 . The bladed device of  claim 1 , wherein the magnitude of the first chord pitch angle is the same as the magnitude of the second chord pitch angle. 
     
     
         3 . The bladed device of  claim 1 , wherein the first-blade canting axis is collinear with or parallel to the second-blade canting axis. 
     
     
         4 . The bladed device of  claim 1 , wherein at least one of the first and second blades has a root and a tip, with a constant chord length throughout most of the radial distance from the root to the tip. 
     
     
         5 . The bladed device of  claim 1 , wherein at least one of the first and second blades has a root and a tip, with a constant chord pitch angle throughout most of the radial distance from the root to the tip. 
     
     
         6 . The bladed device of  claim 1 , wherein at least one of the first and second blades has a root and a tip, with a surfaces of the at least one of the blades flat throughout most of the radial distance from the root to the tip. 
     
     
         7 . The bladed device of  claim 1 , further comprising a hub wherein the hub has a hub portion connected to one of the blades, wherein the hub portion is canted about a hub canting axis. 
     
     
         8 . the bladed device of  claim 1 , wherein the first chord plane is oriented for the first radial, or a radial parallel to it, to bisect the planform of the first blade at the first chord plane, and wherein the second chord plane is oriented for the second radial, or a radial parallel to it, to bisect the planform of the second blade at the second chord plane. 
     
     
         9 . The bladed device of  claim 8 , wherein the magnitude of the first chord pitch angle is the same as the magnitude of the second chord pitch angle. 
     
     
         10 . The bladed device of  claim 8 , wherein the first-blade canting axis is collinear with or parallel to the second-blade canting axis. 
     
     
         11 . The bladed device of  claim 8 , wherein at least one of the first and second blades has a root and a tip, with a constant chord length throughout most of the radial distance from the root to the tip. 
     
     
         12 . The bladed device of  claim 8 , wherein at least one of the first and second blades has a root and a tip, with a constant chord pitch angle throughout most of the radial distance from the root to the tip. 
     
     
         13 . The bladed device of  claim 8 , wherein at least one of the first and second blades has a root and a tip, with a surfaces of the at least one of the blades flat throughout most of the radial distance from the root to the tip. 
     
     
         14 . The bladed device of  claim 8 , further comprising a hub wherein the hub has a hub portion connected to one of the blades, wherein the hub portion is canted about a hub canting axis. 
     
     
         15 . A bladed device for operation in a fluid medium, the device comprising:
 a. at least one pair of blades, the pair of blades comprising two blades one of the two blades being a first blade and the other of the two blades being a second blade, wherein the pair of blades is spinnable about a spin axis, the spin axis being normal to a hub plane; wherein,   b. the first blade is canted relative to the hub plane about a first-blade canting axis at a first-blade canting angle, the first-blade canting axis being oriented at a first-blade canting axis angle that is other than 90 degrees relative to a first radial; wherein,   c. the second blade is canted about a second-blade canting axis at a second-blade canting angle, the second-blade canting axis being oriented at a second-blade canting axis angle that is other than 90 degrees relative to a second radial; wherein,   d. at least part of one of the two blades is overall canted rearward of the hub plane, and at least part of the other one of the two blades is overall canted forward of the hub plane; wherein,   e. the first radial is perpendicular to a first chord plane wherein the first chord plane passes through the first blade and contains a first-blade chord, and the second radial is perpendicular to a second chord plane wherein the second chord plane passes through the second blade and contains a second-blade chord; wherein,   f. the first-blade chord is oriented at a first chord pitch angle, the first chord pitch angle being coupled to the first-blade canting axis angle and the first-blade canting angle; wherein,   g. the second-blade chord is oriented at a second chord pitch angle, the second chord pitch angle being coupled to the second-blade canting axis angle and the second-blade canting angle; and, wherein,   h. the first chord plane is oriented for the first radial, or a radial parallel to it, to bisect the planform of the first blade at the first chord plane, and the second chord plane is oriented for the second radial, or a radial parallel to it, to bisect the planform of the second blade at the second chord plane.   
     
     
         16 . The bladed device of  claim 15 , wherein the magnitude of the first chord pitch angle is the same as the magnitude of the second chord pitch angle. 
     
     
         17 . The bladed device of  claim 15 , wherein the first-blade canting axis is collinear with or parallel to the second-blade canting axis. 
     
     
         18 . The bladed device of  claim 15 , wherein at least one of the two blades has a root and a tip, with a constant chord length throughout most of the radial distance from the root to the tip. 
     
     
         19 . The bladed device of  claim 15 , wherein at least one of the two blades has a root and a tip, with a constant chord pitch angle throughout most of the radial distance from the root to the tip. 
     
     
         20 . The bladed device of  claim 15 , further comprising a hub wherein the hub has a hub portion, the hub portion being connected to one of the blades, wherein the hub portion is canted about a hub canting axis.