The is third stage wanted checkbox determines whether a third stage should be analyzed. For low performance chemical rockets, three stages is the optimum number of stages to get into orbit from earth. To fully analyze a three stage spacecraft, is second stage wanted checkbox must be on, is third stage wanted checkbox must be on and both the first stage payload ratio and second stage payload ratio must be positive. If the is second stage wanted checkbox is off or if either the first stage payload ratio or the second stage payload ratio is not positive, the third stage will not be analyzed, even if the third stage wanted checkbox is on.

This is used in multi stage spacecraft, and spacecraft cost.
 

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