The system Hop Up and airsoft are inseparable. Why, you ask? It seems that there is no need to explain that in the shooting duel the winner is the one who shoots more accurately. Let's take a closer look at how the accurate shooting in airsoft and the hop-up system are related.
M4 SOPMOD
You can safely say that almost all models of airsoft weapons are equipped with a system that twists the ball and calls it, as you might have guessed, the Hop Up system. When shot, the ball rolls up, this provides a more stable trajectory and increased range of the flight of the ammunition. Due to what is happening?
The balloon moves in the air. In this case, there is a linear velocity and angular velocity of rotation. In flight, gravity, air resistance, and also the force transferred by the initial impulse-in our case by the air pressure-act on it.
When the ball is twirled, there is another force that counteracts the force of gravity in flight. And no matter how perfect it is, it still has irregularities on the surface, which, thanks to rotation, grips the flow of air in which it moves.
As a result, air condensation forms in the lower part of the ball (due to the connection of two streams - the "initial" and "entrained in rotation"), while in the upper one, a rarefaction is formed, because both streams "slip" in the direction of motion of the "initial" flow air. This is how the lifting force is formed.
In order to tighten the ball, it is necessary to create an instantaneous velocity center just above its center. Namely, in the place of its touch with the wall of the trunk. This is achieved with different coefficients of friction from above (elastic band Hop Up) and from below (stem). Since the coefficient of friction below is much lower, the ball slips and receives a rotational motion upward.
Just by changing the friction coefficient and adjusting the flight path of the airsoft ball is achieved. This is done in different models of airsoft weapons rare exception is identical. In particular, the photo shows the mechanism for adjusting the hop M4 rifle.
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