Medusa Booster and Sustainer Motor Case

Constraints:

• manufacturing capability
  • lathes can machine up to 6" diameter
• available liners' specs (lengths)
  • 48", 53.1", 59.1", 65"
• need for a casting tube within liner
  • unless multicast in one liner is feasible

Design Specs:

• 6" OD
• Internal pressure expected to be around 1500-2000 psi max
• Safety factor 2
• min. thickness: 0.362"

Constraints:

• available liners' specs (lengths)
  • 48", 53.1", 59.1", 65"

Design Specs:

• 4" OD
• Internal pressure expected to be around 1500-2000 psi max
• Safety factor 2
• min. thickness: 0.241"

Case calcs done using 2000 psi as internal pressure

Thin vs Thick Case Assumption: thin case assumption can be used if   $//<![CDATA[ \begin{array}{l}\frac{Diameter}{thickness} < 20\end{array} //]]>$

Booster

Booster thin case assumption if t < 0.3"

Calculated with thin case assumption -> safety factor = 2, case thickness = 0.343"

Move onto thick case assumption -> safety factor = 2, case thickness = 0.362"

Sustainer

Sustainer thin case assumption if t < 0.2"

Calculated with thin case assumption -> safety factor = 2, case thickness = 0.229"

Calculated with thick case assumption -> safety factor = 2, case thickness = 0.241"

MATLAB file for case calculations: case calcs.m