The effective reusability is the amount of times that the spacecraft can launch. This assumes perfect reliability and no overhauls. Less then perfect reliability and overhauls lower the effective reusability of the spacecraft. The greater the reusability required, the heavier the craft will be. This is partly because the components have to be heavier so that they will be stressed at a lower ratio of their yield strengths, partly because more redundency will be required and partly because heavier types of components will required, like insulated tiles instead of ablative coatings. The reusability is used along with the initial structure cost to calculate the launch hours and structure cost per launch.

In pumped rocket and rocket cost reusability is used to calculate effective tensile.

effective tensile = tensile dimensionality * tensile energy / safety factor / ( 1.0 + 0.13 * log( reusability ) )
 

In spacecraft cost reusability is used to calculate launch hours and structure cost per launch.

launch hours = initial hours * ( launch multiplier + 1.0 / reusability )

launch structure = initial structure / inReusability
 
 

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