Hybrid rolling bridle system for distributing load while permitting freedom of rotation
The exemplary embodiments herein provide a bridle for use with a rigid wing having two opposing ends, the bridle having a fixed bridle member attached to a bottom surface of the wing, a pair of connection points positioned on the fixed bridle and located at distance D vertically below the bottom surface of the wing, a rolling bridle member with a pair of opposing ends, where each opposing end is attached at one of the connection points, and a pulley with a sheave that travels along the rolling bridle member. In some embodiments, a motor is mechanically connected with the sheave. In some embodiments, the distance D is optimized for a preferred roll moment as the wing rolls through various angles.
1. A bridle and wing assembly comprising:
a wing having two opposing ends;
a fixed bridle member attached to a bottom surface of the wing;
a pair of connection points positioned on the fixed bridle and located at distance D vertically below the bottom surface of the wing;
a rolling bridle member with a pair of opposing ends, where each opposing end is attached at one of the connection points; and
a pulley with a sheave that travels along the rolling bridle member.
2. The assembly of claim 1 further comprising:
a motor mechanically connected to the sheave.
3. The assembly of claim 1 further comprising:
a tether attached to the pulley and containing at least one electrical conductor.
4. The assembly of claim 1 wherein:
distance D is selected so that only positive moment inputs are required for the wing to achieve all roll angles between zero and 45 degrees.
5. The assembly of claim 2 wherein:
actuation of the motor causes the wing to roll when the wing is airborne and tethered to a ground connection point.
6. The assembly of claim 3 wherein:
the electrical conductors of the tether continue past the pulley to connect with the wing.
7. The assembly of claim 1 wherein:
the wing contains a pair of separation joints on each side of a centerline of the wing so that a separation joint is placed generally above each connection point.
8. The assembly of claim 1 wherein:
distance D is selected so that the absolute value for all moment inputs required for the wing to achieve all roll angles between zero and 45 degrees has been minimized.
9. The assembly of claim 1 wherein:
the wing contains a pair of separation joints on each side of a centerline to define a central wing portion with two outer wing portions, and wherein the fixed bridle member connects between the central wing portion and the outer wing portion.
10. A bridle and wing assembly comprising:
a wing having two opposing ends and a centerline at the center of the wing;
a pair of fixed bridle members, each pair having a proximal end which is attached to a bottom surface of the wing near the centerline and a distal end which is attached near the opposing ends of the wing;
a connection point located between the proximal and distal ends of each fixed bridle member;
a rolling bridle member with a pair of opposing ends, where each opposing end is attached with a fixed bridle member at the connection point; and
a motorized pulley with a sheave that accepts the rolling bridle member such that actuation of the motor causes the wing to change its roll angle.
11. The assembly of claim 10 further comprising:
a tether attached to the pulley.
12. The assembly of claim 10 wherein:
the connection point on each fixed bridle member is positioned near the center of each fixed bridle member.
13. The assembly of claim 11 further comprising:
one or more electrical conductors within the tether.
14. The assembly of claim 11 wherein:
the electrical conductors of the tether continue past the pulley to connect with the wing.
15. A bridle and wing assembly comprising:
a wing comprised of a central wing portion and a pair of surrounding outer wing portions connected to the central wing portion at separation joints;
a pair of fixed bridle members, each pair having a proximal end which is attached to a bottom surface of the central wing portion and a distal end which is attached to one of the outer wing portions;
a connection point located between the proximal and distal ends of each fixed bridle member;
a rolling bridle member with a pair of opposing ends, where each opposing end is attached with a fixed bridle member at the connection point; and
a pulley with a sheave that accepts the rolling bridle member.
16. The assembly of claim 15 wherein:
the connection points are located at a vertical distance below the bottom surface of the wing that allows for only positive moment inputs for all roll angles between zero and 45 degrees.
17. The assembly of claim 15 wherein:
the connection points are located at a vertical distance below the bottom surface of the wing which minimizes the absolute value of moment input required for all roll angles between zero and 45 degrees.
18. The assembly of claim 15 wherein:
the wing separation joints are positioned on areas of the wing having a bending moment that is between −200 N-m and +200 N-m near zero N m.
19. The assembly of claim 15 further comprising:
a motor mechanically connected to the sheave.
20. The assembly of claim 15 further comprising:
a tether attached to the pulley and comprised of one or more electrical conductors which continue past the pulley and attach to the wing.