And how much rubbish do you actually collect? before this in 80 metres about four kilograms of trash. four kilograms in 80 metres?! i am dying to have a go to control it. sure. it is an easy control. forwards and backwards. left and right. and this controls the speed. and if you push this down it is digging the sand. this is great. i m cleaning the beach! dr a and his team are working on a second prototype to separate the shells from the trash. at the moment that needs to be done by hand. it is satisfying to see so much rubbish come in. there is a big focus here on getting the next ....