When looking for a person that might be drowning, speed is critical. By deploying an underwater drone from an airborne quadcopter to help first responders find someone and get an overview of the situation, the response time might be reduced significantly. This is just one of the applications that was considered in the design of a multi-domain drone platform for Robor Electronics. One of the most critical components is of course the underwater vehicle, which was designed from scratch.
This underwater vehicle is only a part of a larger whole that I designed for Robor Electronics, from which it takes its conceptual framework and requirements. For more context on this concept, check out the overview of the whole system.
The project started with an idea I got together with my dad: Wouldn't it be cool to use existing RC technology to make an underwater drone that could deliver an experience that feels like swimming like a fish? Based on this, I made a pitch for Robor Electronics that proposes a submersible that makes use of hydrodynamic lift. It would behave like an upside-down airplane, giving the user the experience of "flying" through the water. This spark started an exploration of new underwater possibilities based on drone technology.
After researching possible markets and current solutions, a broad range of solution ideas were explored and sketched out. One of the challenges was providing fast and reliable communication, as we wanted to establish a live video feed, but wireless communication was not possible since only low frequency signals can travel far enough. Different solutions were considered, such as a surfacing antenna buoy and local interpretation of the footage, so that vehicle could send only coordinates of points of interest, resulting in a lighter data stream which could be translated to a graphic representation of the vehicle’s environment on the recieving end.
The ideas are filtered and merged into a couple of concepts. The different concepts solved problems in different ways. Fast deployment for example could be realised by lowering the vehicle from a quadcopter or floating dock/boat, making the vehicle amphibious or by catapulting the vehicle.
We decided to continue with a combination of the first two concepts. Robor already developed a powered spool for a lightweight tether that could be mounted to the Matrice 100 quadcopter [link]. Using that as a starting point, efforts can be redirected to the development of the submersible vehicle itself. This resulted in a functional prototype for a small remotely operated camera vehicle.
The concept is updated based on further conversations with Robor and feedback from testing the prototype. The rotor wings are the only custom structural part. Its symmetry means that only one mold is needed for all three wings. Since the initial batch size would be low, this drives down production costs per unit significantly. Using resources from the launch/support vehicle, the solution can be made even more compact and cost-efficient. Without the need for a battery on board, the entire control system can be cramped in the back of an extended GoPro-casing, together with the camera itself.
Read more about some of the parts that I designed for the platform.