Initial hours is defined as the amount of labor required to build a stage of the spacecraft. The amount of labor required to build a stage of a spacecraft ranges from ten hours for a seven kilogram model to five hundred thousand hours for a Saturn V class stage. This includes the work of the technicians as well as a minimum of support personnel in a well run corporation. This does not include the wasted labor in a poorly run organization, that is considered to be part of the labor rate for that organization. In other words, say you have an inefficient bureaucracy where only one in four of the hours worked is actually useful, the constructions hours are considered to be the same, it is the labor rate that is four times higher.

In rocket cost given empty mass, labor scale factor and ten ton craft work initial hours can be calculated which is in turn used to calculate the initial labor.

initial hours = ten ton craft work * pow( ( empty mass / 10,000 ), labor scale factor )

initial labor = initial hours * labor rate
 

In spacecraft cost given empty mass, labor scale factor and ten ton craft work initial hours can be calculated which is in turn used to calculate initial labor and launch hours.

initial hours = ten ton craft work * pow( ( empty mass / 10,000 ), labor scale factor )

initial labor = initial hours * labor rate * location labor multiplier

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

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