Problem Graphic
Delta 2 Rocket (US)
Mu3SII Rocket (Japan)


The lead engineer on the new Starfinder rocket must determine the force in each member of the interstage truss structure. If the load is too high, the firststage thrust will buckle the truss members.
What is known:
 The base ring radius is 1 m.
 The top ring radius is 0.75 m.
 The base and top ring are 1 m apart.
 The total thrust of the firststage main engine is 2,400 kN (300 kN per joint).
Dimension Diagram
