Motor pylons for a kite and airborne power generation system using same
View Patent ↗A motor pylon system adapted for use with an airborne power generations system is disclosed. The pylons may support turbine driven generators for wind based electrical power generation which also function as electric motors in some aspects. The pylons may be designed to provide side force useful for turning a tethered flying wing flying in a circular cross wind flight path. The pylons may be designed to minimize air flow disruptions over the main wing.
1. A motor pylon system for use on a high lift rigid flying device, said motor pylon system comprising:
a main wing, wherein said main wing includes a leading edge and a trailing edge; and
one or more motor pylons, said motor pylons comprising:
a lower pylon; and
an upper pylon, wherein said lower pylon is attached to a lower surface of said main wing and a trailing edge of said lower pylon extends beyond said leading edge of said main wing, and wherein said upper pylon is attached primarily to said lower pylon and wherein a trailing edge of said upper pylon meets said main wing at said leading edge of said main wing.
2. The motor pylon system of claim 1 wherein each of said one or more motor pylons comprise:
a first turbine driven generator attached to said upper pylon; and
a second turbine driven generator attached to said lower pylon.
3. The motor pylon system of claim 2 wherein said main wing is part of a tethered kite system.
4. The motor pylon system of claim 2 wherein said upper and lower pylons are swept forward.
5. The motor pylon system of claim 2 wherein a blend between the upper and lower pylon is contoured along a mean flow within a flow field around the main wing.
6. The motor pylon system of claim 2 wherein the lower pylon of said one or more motor pylons supports a trailing element or flap of said main wing.
7. The motor pylon system of claim 1 wherein said upper pylon comprises a first vertical airfoil element and wherein said lower pylon comprises a second vertical airfoil element.
8. The motor pylon system of claim 7 wherein said first vertical airfoil element is mounted at an angle such that said first vertical airfoil element generates a side force in a first direction when air flows over said main wing.
9. The motor pylon system of claim 8 wherein said second vertical airfoil element is mounted at an angle such that said second vertical airfoil element generates a side force in said first direction when air flows over said main wing.
10. The motor pylon system of claim 9 wherein said upper and lower pylons are swept forward.
11. The motor pylon system of claim 1 wherein the trailing edge of the upper pylon meets or blends into the main wing at a point near a stagnation point of an unperturbed segment of the main wing.
12. The motor pylon system of claim 1 wherein said upper and lower pylons are swept forward.
13. The motor pylon system of claim 1 wherein said main wing comprises a box-type spar, and wherein said motor pylons are attached to said main wing with shear plates bonded to a shear wall of the box-type spar.
14. The motor pylon system of claim 13 wherein said box-type spar is of single-piece construction.
15. The motor pylon system of claim 1 , wherein said trailing edge of said lower pylon extends to said trailing edge of said main wing.
16. The motor pylon system of claim 1 , wherein said trailing edge of said lower pylon extends beyond said trailing edge of said upper pylon.
17. The motor pylon system of claim 1 wherein said trailing edge of said upper pylon ends ahead of a stagnation point of said main wing.
18. The motor pylon system of claim 1 wherein said trailing edge of said lower pylon curves outwards toward said trailing edge of said main wing before curving back inwards to an attachment point on said lower surface of said main wing.
19. The motor pylon system of claim 1 , wherein said upper pylon is thinner than said lower pylon, and a junction between said upper pylon and said lower pylon tapers to a smaller width from said lower pylon to said upper pylon.
20. The motor pylon system of claim 1 , wherein said lower pylon is longer than said upper pylon.