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Arrow Dynamics' Launched Loop coasters, which were popular in the 1970s and 1980s, use a powerful electric motor and tensioned springs to propel a launch car forward. The launch car pushes the train outward to a drop, and then returns to its position. After the train reaches the opposite platform, another catch car works the same way.
Side friction wheels keep the train centered in the track, avoiding derailment. The final set of wheels in the assembly are known as running wheels, road wheels, or tractor wheels. Running wheels are typically the largest set of wheels in the assembly, and roll on the top of the rails. These wheels bear the weight of the train.
The launch dog is normally retracted and is held in place by a small magnet, but the launch area has electrical contacts that demagnetize the magnet and cause the launch dog to drop down. The launch dog drops down at an angle, similar to the chain dog that a lifted coaster uses to connect to the lift chain.
Some roller coasters use drive tires instead of a chain on lift hills. Notable examples include many junior coasters made by Vekoma and Zierer, The Olympia Looping traveling roller coaster, and Mindbender at Galaxyland. Drive tires are also used to power other types of amusement rides, such as ferris wheels, Pirate Ships, and other spinning rides.
I reached out to a couple of professional etiquette experts and advice givers to ask if they had thoughts about how to quit a group chat you hate without damaging relationships.
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