Patent application for Invention of protective and retrieval mechanisms for making unmanned aerial vehicles (UAV) and drones float on water surface to make them retrievable after a crash into water bodies.

A system to provide drones and unmanned aerial vehicles an ability to float and not sink in an event of crash into water bodies and reduce physical damage by providing a cushioning effect in an event of crash on land or water body, comprising,

• a) both words drones and unmanned aerial vehicles in the claim will be mentioned as UAV here after,
• b) usage of one or more inflatable devices on UAV to act as floatation chamber inflated by a gaseous media to provide buoyancy to make UAV float on the surface of a water body,
• c) said inflatable device, when inflated is also designed to act as a shock absorbing device during the crash landing of UAV,
• d) usage of a gas producing chemical media stored on board for inflating the said inflatable device,
• e) in some applications, compressed air may substitute gaseous media,
• f) usage of a combination of one or more different types of triggering devices for release of gaseous media to inflate the said onboard inflatable devices,
• g) said triggering devices may be mechanical, chemical action, electrical, electro chemical devices used alone or in a combination,
• h) said triggering devices, alone or in combination may be triggered by a single or multiple command signals, such as signal from onboard crash sensing sensors, signal from onboard water presence detect sensors, signal from onboard flight controller and wireless signal from remote wireless controller of UAV,
• i) usage of on board audio and visual alarm to indicate UAV's location of crash site,
• j) usage of on board transmitting wireless beacon to indicate location of crash site of UAV,
• whereby, a retrievability to UAV and a protection to UAV from getting lost in water or terrain utilizing this system after a crash in water bodies or land will be provided.