Sparky motors contain particles of titanium (sometimes referred to as ‘titanium sponge’) in the propellant grains, resulting in a shower of sparks being emitted from the motor when the rocket is launched.
These types of motors have several descriptive names, including
- Black Lightning
- Dark Matter
While they are lots of fun to watch they greatly increase the risk of fire at the launch site.
Unfortunately for this reason, sparky motors are unable to be flown at VRA launch sites.