초록 ▼

A propeller is used to displace a vehicle at a reduced speed but with a high slip of approximately at least 60% and has a quality coefficient of at least 70% for 100% slip. The ratio of the diameter of the propeller to its pitch is approximately 1.18 to 2.9 times the value of the quality coefficient

A propeller is used to displace a vehicle at a reduced speed but with a high slip of approximately at least 60% and has a quality coefficient of at least 70% for 100% slip. The ratio of the diameter of the propeller to its pitch is approximately 1.18 to 2.9 times the value of the quality coefficient, and the blade width of the propeller is 0.09 to 0.19 times the pitch of the propeller. The propeller pitch is substantially constant and the aerodynamic center of pressure is located at a distance from the propeller axis of rotation equl to approximately ¾of the propeller radius. The radius of the curvature of the leading propeller edge, when seen in cross section, is to approximately ¼to ⅓of the greatest blade thickness. In addition the angle of the blade inclination decreases continuously as the propeller diameter increases and the blade thickness is greatest in the leading third of the blade width, relative to the normal rotation direction of the propeller.

대표청구항 ▼

In a drive system for propelling a land or water vehicle at a reduced speed by rotation of a propeller in the air with a high slip of approximately at least 60% and having a quality coefficient of at least 70% for 100% slip, the improvement wherein the propeller is of substantially constant pitch; t

In a drive system for propelling a land or water vehicle at a reduced speed by rotation of a propeller in the air with a high slip of approximately at least 60% and having a quality coefficient of at least 70% for 100% slip, the improvement wherein the propeller is of substantially constant pitch; the propeller is rotated about an axis and the aerodynamic center of pressure is located at a distance from the propeller axis equal to approximately three-fourths of the radius of the propeller; the angle of the blade inclination decreases continuously as the diameter of the propeller increases; the thickness of the blade is greatest in the leading third of the width of the blade; the propeller has a leading edge and a trailing edge and the leading edge has a radius of curvature that is greater seen in cross section than the radius of curvature of the trailing edge, the radius of curvature of the trailing edge being smallest in the area of approximately the outermost third of the propeller; the propeller has a suction surface that has a shape when seen in cross section that is an essentially straight line in the area between the region of greatest blade thickness and the trailing edge; the ratio of the diameter of the propeller to its pitch is approximately 1.18 to 2.9 times the value of the quality coefficient; and the blade width of the propeller is 0.09 to 0.19 times the pitch of the propeller, the pitch being the axial propeller displacement with no slip.