This is a scaled-down test motor for the Sugar Shot to Space project. At each step, this team is testing larger motors, working their way up to the full-scale project. This latest development is exciting because it means that the space shot is not too far off. The SS2S team plans to fire a very large (comparable in size to an S or T composite motor) rocket, but to do so with a dual thrust motor. That is, a motor that burns for boost, burns a delay, and then starts burning under thrust again. This helps improve overall altitude, reducing drag and dynamic pressure.
Read more about this at Randy's Rocketry and about the SS2S.