Relating to spinning spherical projectiles, some airsoft guns impart backspin on the spherical plastic pellets they fire to flatten their trajectory: https://en

Relating to spinning spherical projectiles, some airsoft guns impart backspin on the spherical plastic pellets they fire to flatten their trajectory: https://en.wikipedia.org/wiki/Hop-up_(airsoft) https://en.wikipedia.org/wiki/Hop-up_(airsoft)