|Type||Steel - Terrain|
|Riders per train||20|
|Help - Infobox 3|
Green Dragon (Welsh: Y Ddraigg Werdd) is a steel roller coaster located at GreenWood Forest Park in Y Felinheli, Gwynedd, Wales, UK. It was built by WGH Transportation and opened on May 29, 2004. The roller coaster is unique in that it uses guests' potential energy to lift the train and, when operating at full capacity, it generates electricity for the national grid.
The roller coaster has a relatively short length of 918.7 feet which twists through forest while keeping close to the terrain. It then passes over the slide attraction before making a 270 degree turn at its highest point above ground and heading back into the woods towards the station.
Green Dragon has a single train. While queuing, guests climb a set of stairs. Before riding, a train's worth of guests stand in a booth which is then allowed to fall slowly. The booth is connected mechanically to a platform which raises the train. The potential energy from the riders is thus transferred to the empty train, causing it to rise as it is lighter than the booth containing people. The guests in the booth then climb another set of stairs and board the train, which then accelerated out the station by drive tyres. After riding, guests leave the train at the lowest point and the cycle is repeated.
The park claims that, with an average of ten passengers per cycle, the ride is 93% efficient. With a full load, the roller coaster is over 100% efficient and feeds electricity back to the national grid.