Hi Guys, I've made an amphibious bike, shown below. Basically, it's a bike which you can use to cycle along the road, down the slipway into the water with litle/no changeover, and then pedal off through the water. It all works, and floats, but I'm struggling to find a way to propel it in the water, without just using an electric outboard! Here are my thoughts so far: Flipper - best solution so far, but it's too slow in the water. Paddle Wheel - can't find a way of powering in the water, or disconnecting power when travelling on land. Making rear wheel a paddle wheel by placing metal sheets inbetween the spokes - can't find a 'safe' way to make the forks wider. Propellor - can't find a way of powering it, or lowering it into the water. Any thoughts would be very much appreciated!