Why do roller coasters use clothoid loops instead of circular loops?

Roller coasters today employ clothoid loops rather than the circular loops of earlier roller coasters. This is because circular loops require greater entry speeds to complete the loop.



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A circular loop has two very fundamental problems: The g-forces that a body is exposed to at the bottom of the loop exceed what is safe (when travelling at a speed that just allows the car to sail over the top of the loop).

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Physics/Mechanics Most roller coaster loops are not circular in shape. A commonly used shape is the clothoid loop, which resembles an inverted tear drop and allows for less intense G-forces throughout the element for the rider.

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A circular loop would cause a jolt from the sudden addition of the centripetal acceleration. A teardrop shape controls that acceleration, easing the rider through the loop and preventing jerk. And then there are rolls, which can disorient riders in several ways.

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Basic mathematical subjects such as calculus help determine the height needed to allow the car to get up the next hill, the maximum speed, and the angles of ascent and descent. These calculations also help make sure that the roller coaster is safe. No doubt about it--math keeps you on track.

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TIL why roller coaster loops are never circular but instead are designed with an upside down teardrop shape. Perfectly circular loops will subject riders to up to 6 Gs of g-force, causing them to get injured.

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For a roller coaster, gravity pulls down on the cars and its riders with a constant force, whether they move uphill, downhill, or through a loop. The rigid steel tracks, together with gravity, provide the centripetal force needed to keep the cars on the arching path as they move through the loop.

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In roller coasters, the two forms of energy that are most important are gravitational potential energy and kinetic energy. Gravitational potential energy is the energy that an object has because of its height and is equal to the object's mass multiplied by its height multiplied by the gravitational constant (PE = mgh).

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Officials in the US state of Wisconsin are investigating how eight people became trapped upside down on a roller coaster at a festival; some of them for more than three hours. The roller coaster's cars got stuck near the top of a loop around 1:30 pm Sunday at the Crandon International Offroad Raceway.

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The Smiler at Alton Towers holds the world record for the number of inversions on a roller coaster with 14.

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At the bottom of the loop, gravity and the change in direction of the passenger's inertia from a downward vertical direction to one that is horizontal push the passenger into the seat, causing the passenger to once again feel very heavy.

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As you ride a roller coaster, its wheels rub along the rails, creating heat as a result of friction. This friction slows the roller coaster gradually, as does the air that you fly through as you ride the ride.

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The 5 Fastest Roller Coasters in the World
  1. Formula Rossa at Ferrari World (Abu Dhabi) Formula Rossa / miles_around/iStock. ...
  2. Kingda Ka at Six Flags Great Adventure (Jackson, NJ) ...
  3. Top Thrill Dragster at Cedar Point (Sandusky, OH) ...
  4. Red Force at Ferrari Land (Salou, Spain) ...
  5. Dodonpa at Fuji-Q Highland (Yamanashi, Japan)


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In Branson, Missouri, Silver Dollar City can now claim to the world's only wooden coaster to twist upside down three times. With its 720° double barrel roll, Outlaw Run will draw visitors like bears to honey.

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A rollback occurs on a launched roller coaster when the train is not launched fast enough to reach the top of the tower or hill. It will roll backwards down the tower, and will be stopped by brakes on the launch track. Any roller coaster on which it is possible for a rollback to occur will have these brakes.

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06 September 22 - 5 Interesting Facts About Roller Coasters
  • The First Roller Coaster was Built in 1817. ...
  • Britain's Oldest Surviving Roller Coaster was Built in 1920. ...
  • There are More Than 2,400 Roller Coasters in the World Today. ...
  • Roller Coaster are Among the Safest Rides. ...
  • Roller Coaster Loops are Never Perfectly Circular.


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