5
Fig. 8 How to launch (fire) a Projectile
Do not look into the barrel or aim at something.
Make sure the area in front of the ball launcher is clear.
Pressing Trigger/Stopper Button only with index finger is highly recommended. Be careful not to catch
finger(s) in between the latch and the knob when SFP gets back.
Specification of “Free-falling Object”
Diameter 35mm
Material: ABS resin
Small steel part on the ball surface: An area for sticking the ball to the iron core of BRU. Fig. 9
Examples of the demonstration:
Below photos were filmed in rapid shooting mode of a high-speed camera and processed using graphic software. Photos
on the left are the stroboscopic images of the projectile launched with a greater magnitude, whereas those on the right
are the images of the projectile launched with a smaller magnitude.
1. Example of Projectile Trajectory (when the launch angle is around 40 degrees above the horizontal plane):
