Bi-planer rotor blade

Patent metadata

Field	Value
Publication number	US-10875639-B2
Application number	US-201916279595-A
Country	US
Kind code	B2
Filing date	Feb 19, 2019
Priority date	Feb 19, 2019
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A biplaner rotor blade has an upper airfoil section connected to a lower airfoil section such that the upper airfoil and lower airfoil are rotated in separate planes—an upper plane and a lower plane. The upper airfoil has a root end attached to a hub at an upper location of the hub and the lower airfoil has a root end attached to the hub at a lower location of the hub. The upper airfoil converges with the lower airfoil to form a blade tip end at the outermost portion of the blade, thus generating lift along two geometric planes.

First claim

What is claimed is:

1. A biplaner rotor blade, comprising:
an upper portion having an upper-portion straight leading edge which extends for a first straight distance from an upper-leading-edge end point to an upper-portion-leading-edge demarcation point, said upper-portion straight leading edge being rotatable in a first planar region, said upper-portion straight leading edge forming an upper chord line with an upper-portion trailing edge such that the upper chord line forms an upper sweep angle Ω with the first planar region, said upper portion having an upper-portion connection region which begins at an upper-portion-trailing edge demarcation point and the upper-portion-leading-edge demarcation point and extends to a tip region;
a lower portion having a lower-portion straight leading edge which extends for a second straight distance from a lower-leading-edge end point to a lower-portion-leading-edge demarcation point, said lower-portion straight leading edge being rotatable in a second planar region that is parallel to said first planar region, said lower-portion straight leading edge forming a lower chord line with a lower-portion trailing edge such that the lower chord line forms a lower sweep angle −Ω with the second planar region, said lower portion having a lower-portion connection region which begins at a lower-portion-trailing edge demarcation point and the lower-portion-leading edge demarcation point and extends to said tip region; and wherein:
said tip region is connected to said upper-portion connection region and said lower-portion connection region, with said upper portion being a first air foil and said lower portion being a second air foil such that said upper portion and said lower portion provide a total sweep angle of 2Ω.

2. A biplaner rotor blade according to claim 1 , wherein:
said first straight distance and said second straight distance are equal.

3. A biplaner rotor blade according to claim 1 , wherein:
a fluid surrounds the biplanar rotor blade and fills an area from an open side to said tip region.

4. A biplaner rotor blade according to claim 3 , wherein:
the fluid is air.

5. A biplaner rotor blade according to claim 1 , wherein:
said upper portion has an upper-root end which is connectable to a hub of a rotorcraft.

6. A biplaner rotor blade according to claim 5 , wherein:
said lower portion has a lower-root end which is connectable to the hub of the rotorcraft.

7. A biplaner rotor blade according to claim 1 , wherein:
a stabilizing rod is connected to said upper portion and said lower portion.

8. A biplaner rotor blade according to claim 1 , wherein:
said upper portion and said lower portion are integrally connected.

9. A biplaner rotor blade according to claim 1 , wherein:
said tip region is a connection region connecting said upper portion and said lower portion.

10. A biplaner rotor blade according to claim 9 , further comprising:
an airfoil extension connected to said connecting region and extending laterally outward therefrom.

11. A biplaner rotor blade according to claim 1 , wherein:
said upper portion connection region and said lower portion connection region are curved.

Assignees

• Us Army

Inventors

• Crocco John P

Classifications

• B64C27/467

  Aerodynamic features · CPC title

• B64C27/463

  Blade tips · CPC title

• B64C27/473 Primary

  Constructional features · CPC title