Dimpled BB's / Golf ball bb's

Dimpled BB Travel

Dimpled/Divoded BB's in my opinion are very cool. If only people would start to make them! What's interesting is that dimpled BB's have better flight performance because they have to spin less (so you can utilize heavier BB's with less hop-up!)! That's because of two factors: The Magnus Force and the Turbulent Boundary Layers.

When a BB spins as it flies at high velocity, the BB's surface grips on to a small amount of air in front area of the BB in which it is called the Turbulent Boundary Layer. This creates deviations of low and high pressure in certain areas. In this case, high pressure is on the bottom of the BB and low pressure is on the top and towards the BB's travel. As you can see on the diagram, the spinning directs the air in the shape of an airfoil.:yup: Now were talking. This effect is called the Magnus Force. This can be seen in golf balls, tennis balls, soccer balls, etc. This effect allows the BB to fly twice to three, four, or even five times as far if it didn't have backspin.

A BB needs the right amount of spin depending on the velocity it is shot at. If you are shooting light BB's in a 500 FPS gun, your going to need to turn the hop up down. And of course if your shooting .40 gram BB's out of 240 FPS gun, your going to need a lot of hop up.

Dimpled BB's are much better than smooth BB's (in theory) because they have SIGNIFICANTLY less drag. This is because the BB can grip more turbulent air and use it to its advantage. The air first goes to the top of the BB were the divots grab the air. The air goes over the top decreasing the pressure much further so the low pressure is even lower, thus creating more lift by creating a vacuum-like pressure so the BB wants to move up. After the pocketed air moves over the top, the air is whipped around to bottom. But here is the magical-er part. The pocketed air is moved into the direction in which the BB is moving. This creates much much higher pressure on bottom, giving it even more lift.

And since there is very little drag on dimpled BB's, this allows you do use much heavier BB's. The draft of the BB doesn't change in size much so you still have a little more accuracy there. This also allows the BB to not interfere that much with the wind. According to my calculations, dimpled BB's have over twice the velocity and twice the range of standard BB's and also have better energy retention (meaning they stay a certain speed for longer). They can also be aimed very precisely and hit targets with over 10 or even 15 times the accuracy at twice the power at twice the range at twice the speed. Hope you guys enjoyed my LLOONNGG reply. Those are just my thoughts and the physics behind them.