Spin up or Hop up is when a bb is shot from an airsoft gun, there is a friction placed on the upper side of the bb while exiting the barrel. This friction causes the bb to "spin upward" or a backwards / under spin. This mechanism is called the Hop-Up. The Hop-Up configuration determines the range of bbs or extend the effective range of an airsoft rifle. Most spring airsoft guns come equipped with "built-in" Hop Up which is not adjustable nor calibrated. However, higher end models, such as gas airsoft pistols and electric airsoft rifles can be adjusted or calibrated both to the type of BB being used and the flight path desired. The below diagram illustrates the effects of hopup and how to callibrate your airsoft gun correctly. Towards the bottom of diagram it coveres the bernoulli's principle and it's effect on the path of a BB with hopup.
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on many high-end, and even some cheaper airsoft guns there is a switch labeled "hop-up" this adjusts how much friction is put on the top of the bb as it exits the barrel. The friction causes the bb to have back spin and therefore curve upwards and have a longer flight. The hop-up can, in the right hands, be used to make longer, accurate shots.
Spin up or Hop up is when a bb is shot from an airsoft gun, there is a friction placed on the upper side of the bb while exiting the barrel. This friction causes the bb to "spin upward" or a backwards / under spin. This mechanism is called the Hop-Up. The Hop-Up configuration determines the range of bbs or extend the effective range of an airsoft rifle. Most spring airsoft guns come equipped with "built-in" Hop Up which is not adjustable nor calibrated. However, higher end models, such as gas airsoft pistols and electric airsoft rifles can be adjusted or calibrated both to the type of BB being used and the flight path desired.
hop up on an airsoft gun is a device that imparts backspin on a bb, giving it a flatter trajectory. They are usually adjustable rubberpieces. The higher you turn it, the greater the range, but generally less accuracy.