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Amazon Is Working On Hot Air Balloon Drone That Approaches Homes Silently (slashgear.com)
Amazon has been granted a patent that describes an "unmanned aerial vehicle with inflatable membrane" that would allow it to approach homes silently. The UAV "would have a balloon hidden inside the chasis," reports Slashgear. "That could be inflated using compressed gas, via a tank or chamber also carried on the drone. When the UAV roamed into an area where noise levels needed to be cut -- such as the delivery location, Amazon suggests -- the balloon could be inflated." From the report: In the process it would mean that the traditional drone propellers would have less work to do, since the UAV's buoyancy would be taken care of by the balloon. All the motors would be required for is general positioning. Amazon doesn't envisage flying the drone like a miniature zeppelin, however. Instead, the balloon system would be used to raise and lower the UAV to and from the delivery location. In that way it could help reduce the noise -- and energy -- involved in achieving a cruising altitude, whereupon the balloon would be deflated and gathered back into its dock.
The drone would proceed to the delivery destination, and then the balloon would be reinflated. That could be used to then gently lower the aircraft to the ground, to leave behind its package. Of course, having an inflating balloon near a system of fast-spinning propellers seems like a recipe for disaster, and so part of Amazon's patent outlines the retracting mechanism by which the two elements would be kept apart. The whole thing would be handled by an onboard autopilot, with the balloon reeled back into the storage area. The drone could either return the gas used for inflation to the compression chamber, or allow it to escape. Indeed, another possibility that Amazon suggests is a completely detachable balloon. That, the patent describes, might then float away, or biodegrade, rather than being reused.
The drone would proceed to the delivery destination, and then the balloon would be reinflated. That could be used to then gently lower the aircraft to the ground, to leave behind its package. Of course, having an inflating balloon near a system of fast-spinning propellers seems like a recipe for disaster, and so part of Amazon's patent outlines the retracting mechanism by which the two elements would be kept apart. The whole thing would be handled by an onboard autopilot, with the balloon reeled back into the storage area. The drone could either return the gas used for inflation to the compression chamber, or allow it to escape. Indeed, another possibility that Amazon suggests is a completely detachable balloon. That, the patent describes, might then float away, or biodegrade, rather than being reused.
A cubic meter of air at standard atmospheric conditions (0C, 1ATM) has a mass of 1.3Kg. If you had a perfect vacuum and somehow the walls were negligible yet able to stand that pressure, a balloon 1 meter in each side would only be able to carry a handful of tubes of toothpaste which are about 0.2Kg each, yet the craft would be the size of a doorway.