Passive safety system
In an embodiment an unmanned aerial vehicle comprises a central body and a plurality of support structures extending outwards from the central body. Each support structure supports a rotor blade assembly and is provided with one or more deformable portions. The rotor blade assembly defines a rotational axis of one or more rotor blades associated with the rotor blade assembly.
1. An unmanned aerial vehicle, UAV, comprising:
a central body; and
a plurality of support structures extending outwards from the central body,
wherein each said support structure supports a rotor blade assembly, the rotor blade assembly defining a rotational axis of one or more rotor blades associated with the rotor blade assembly,
wherein each said support structure is provided with one or more deformable portions,
wherein the one or more rotor blades are mounted on an upper side of the support structure,
wherein the one or more deformable portions comprise at least a padding portion which is located on an underside of the support structure,
wherein the rotor blade assembly comprises a motor housing defining the rotational axis and mounted in a mounting section of the support structure, and
wherein the padding portion comprises a mounting section portion located below the motor housing, the rotational axis passing through the mounting section portion, and wherein the mounting section portion comprises a recess formed therein, the recess housing at least a part of the motor housing, and wherein a rigid surface of the support structure terminates within the recess, the rigid surface being located at a distal end of the support structure.
2. The UAV of claim 1 , wherein the one or more deformable portions are configured to cover at least a portion of the support structure.
3. The UAV of claim 1 , wherein each said support structure comprises:
a rigid inner portion; and
a deformable portion.
4. The UAV of claim 1 , wherein the mounting section portion has a cross-section which is substantially concentric with the rotational axis and has a profile which tapers downwards towards a lower surface of the mounting section portion.
5. The UAV of claim 1 , wherein the mounting section is located at a distal end of the support structure and the support structure comprises an elongate mid-section connecting the central body to the mounting section, and wherein the padding comprises an elongate portion which is located on at least an underside of the elongate mid-section.
6. The UAV of claim 5 , wherein the elongate portion extends below the lower surface of the support structure by a first depth dimension and the mounting section portion extends below the lower surface of the support structure by a second depth dimension, the first and second depth dimensions being measured in a direction parallel to the rotational axis, and wherein the second depth dimension is greater than the first depth dimension.
7. The UAV of claim 5 , wherein:
the support structure extends outwards along a support axis which is substantially perpendicular to the rotational axis,
the elongate portion has a first width dimension and the mounting section portion has a second width dimension, the first and second width dimensions being measured in a direction perpendicular to both the rotational axis and the support axis, and
the second width dimension is greater than the first width dimension.
8. The UAV of claim 1 , wherein the UAV comprises a sensor device, wherein the mounting section portion comprises a further recess formed therein, and the further recess houses the sensor device.
9. The UAV of claim 8 , wherein the further recess is substantially coaxial with the rotational axis.
10. The UAV of claim 8 , wherein an aperture extends through the mounting section portion.
11. The UAV claim 1 , wherein the mounting section portion comprises a stabilising portion configured to engage a horizontal surface when the central body of the UAV is in contact with the horizontal surface and when the UAV is rotated about a tipping axis, thereby to inhibit the one or more rotor blades from engaging the horizontal surface.
12. The UAV of claim 1 , wherein the support structure extends outwards along a support axis, and wherein the rigid surface faces away from the central body, and wherein and the one or more deformable portions comprise an outer deformable portion, the outer deformable portion extending beyond the rigid surface in a direction parallel to the support axis.
13. The UAV of claim 12 , wherein the extension of the outer deformable portion beyond the surface has a thickness, measured parallel to the support axis, of less than 10 cm.
14. The UAV of claim 12 , wherein a free end of each of the at least one rotor blade extends beyond the outer deformable portion in the direction parallel to the support axis.
15. The UAV of claim 1 , wherein the one or more deformable portions comprise an inner deformable layer formed of a deformable material and an outer layer formed of a flexible material.
16. The UAV of claim 1 , wherein the one or more deformable portions cover at least a portion of a lateral surface of the support structure.
17. The UAV of claim 1 , wherein a surface of the one or more deformable portions conforms to a portion of an outer surface of the support structure.
18. The UAV of claim 1 , comprising:
at least one airbag configured to envelope at least a portion of an exterior surface of the UAV upon deployment.
19. The UAV of claim 18 , wherein the at least one airbag is arranged to envelope at least a portion of the support structure upon deployment.
20. The UAV of claim 18 , wherein the at least one airbag is arranged to envelope at least a portion of the rotor blade assembly upon deployment.
21. The UAV of claim 1 , wherein the one or more deformable portions are reusable.