River Rover Hovercraft doors do look a bit like the ones on Dr Emmett Brown’s car in Back to the Future – but that design serves a purpose. Whilst we don’t get up to 88 MPH or need 1.21 Gigawatts of power through our flux capacitor – we do need a design that maximises the volume of cargo we can carry, and doesn’t allow rain, spray, waves, dust or vegetation to get into the cabin. They protect the people inside from noise, and if we need to carry a stretcher we can open the whole side of the cabin up. And if we need to sleep in the hovercraft at night the doors are designed to be used with a mosquito net to provide shelter from rain and maintain cross ventilation.