Did you know that roller coasters don't have engines? That’s because they don’t need them! Gravity is the force that pulls things to the ground. Roller coasters rely on gravity to take them to ...

I Built an 800+ G Force Roller Coaster This Happened - Planet CoasterSubscribe if you like! + <a href="http://bit.ly/1PG8z9GWatch">http://bit.ly/1PG8z9GWatch</a> More ...

However, they actually make a poor analog of a full-sized ride, as gravitational force and aerodynamic drag don’t scale down in the same way, model roller coasters ... s unique motion is that ...

Construction is officially in motion for Wrath of Rakshasa, record-breaking dive coaster set to open at Six Flags Great ...