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Which of these is not a dimensionless performance quantity to assess the performance of the rocket?

Which of these is not a dimensionless performance quantity to assess the performance of the rocket? Correct Answer Aerodynamic ratio α

There are three dimensionless performance parameters to compare the performance of the rockets. The first one is the ratio between initial and final mass which gives us the ratio between the rocket’s stage’s full initial mass to rocket’s final stage’s mass. The second parameter is the structural ratio which is the ratio between the empty mass of stage to the combined empty and propellant mass of the stage. The final parameter is the payload ratio which is the ratio between payload mass to the combined mass of empty and propellant mass.

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