Cesar Cebrian was a lifeguard in Valenica, Spain at an accessible beach. He noticed that wheelchair users were limited to a few platforms and not able to swim on their own. Transferring a rider from a conventional wheelchair to an amphibious wheelchair was difficult, and the user needed a person behind them pushing the wheelchair to move. His solution was SandRoller, a wheelchair that the user can independently roll on a beach. The chair started as a school project at Universidad Politechnica of Valencia and with the help of some designers, prototypers and a CNC machine the chair was born.
Cesar and his team are running a Kickstarter funding campaign that will end on August 19, 2015. Much of the innovation comes from the wheels of the chair. The back wheels are designed to sink into the sand so that the chair won't float away and is able to be rolled by the user. The interior of the wheels is geared for maximum torque to overcome the rolling resistance of sand.
https://www.kickstarter.com/projects/394900021/sandroller
The front wheel is built to float and rotate out of the way for easier user loading. All components are built with corrosion resistant materials. The product documentation says that the chair is modular and can be disassembled for loading but the specifics are not shown. Seat width and depth are 420 and 400 centimeters, respectively.
Sandroller is a great concept but definitely more in the prototype stage than ready for production. Many people are bringing accessibility products to market and I find redesigned wheelchairs the most inspiring. The long goal is to begin manufacturing in January 2015 and deliver first product in April 2016. This funding period, prototyping, and testing will be completed during the rest of 2015.
https://www.kickstarter.com/projects/394900021/sandroller