[Omaroo (Chris Malikoff)]

Originally Posted by sjastro

Actually you can't curve the bullet in the same plane as your arms.
What makes it obvious is that a slingshot or an olympic hammer throw can be used to demonstrate the same principle. When you let go the trajectory is a tangent or straight line to the curve.
People have known that since the Stone Age.

Similiarly the trajectory of the bullet fired is a tangent to the direction of the movement of the arm.

It's like reinventing the wheel for experimentation.

Yes... a release vector.