This is my entry into the WWPPBB 2014. Not so much a pop-pop boat, more a pop-pop raft. Powered by a traditional coil, fueled by a dollop of Sterno. Unfortunately, the weight of the coil was too much for the sticks alone and the first time I launched it, it immediately sank! I had to add a little extra boyancy on the bottom. I added a crude rudder, consisting of a small piece of scrap balsa pushed through a hole in the bottom; more to keep it in a straight line than to steer it but there is room in the hole to twist it slightly.