Use the dropper to fill one of the exhaust pipes with water, until you see water coming out of the other pipe. Then float the boat in water. Finally, place the candle on the tray, light, and place inside the boat.
Candle Powered Boat
Use the dropper to fill one of the exhaust pipes with water, until you see water coming out of the other pipe. Then float the boat in water. Finally, place the candle on the tray, light, and place inside the boat.