...
The 3-d drawings for the sustainer and its cross-section view can be found below.
Figure 1: Sustainer.
...
Here, the thrust curve for the sustainer can be found.
Figure 3: Sustainer thrust curve.
...
The divergence and convergence half angles are 15.0 and 60.0 degrees, respectively. A close-up 3-d drawing of the nozzle can be found below.
Figure 4: Cross-section view of the sustainer nozzle.
Grains
The propellant used in both motors of the rocket is the Cherry Limeade.
...