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Figure 3: Booster thrust curve.
Motor Specifications and the Nozzle
This is an N2837 motor, with a total impulse of 16.5 kNs.
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Lastly, the expansion ratio for our booster is 7.65.
Simulator Files
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The nozzle has a throat diameter of 1.085 in and an exit diameter of 3.0 in. The throat length is 0.1 in.
The divergence and convergence half angles are 15.0 and 60.0 degrees, respectively. A close-up 3-d cross-section of the nozzle can be found below.
Figure 4: Cross-section view of the booster nozzle.
Grains
The propellant used in both motors of the rocket is the Cherry Limeade.
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- Bates: This grain has a core diameter of 1.2 in, with an outer diameter of 3.56 in and a length of 12.0 in. It has a mass of 6.427 lbs.
- Bates: This grain has a core diameter of 1.25 in, with an outer diameter of 3.56 in and a length of 11.0 in. It has a mass of 5.827 lbs.
3. Finocyl: This grain has a cire diameter of 1.3 in, with 4 fins. Each fin has a width of 0.25 in and a length of 0.85 in. The outer diameter of the grain is 3.56 in with a total length of 10.0 in. It has a mass of 4.713 lbs.
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Simulator Files
For reference, the motor simulation file can be found here: 16.5KNs_N2827_37in.ric