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## Summary:

- When calculating the dV available from a rocket booster, is the ISP always multiplied by 9.81 to get the exhaust velocity?

When calculating the dV available from a rocket booster, the below calculation is used:

(ISP . g) . ln(Mass when full/Mass when empty)

Is 'g' always equal to 9.81 in this equation, or do you use the actual gravitational acceleration that the booster will experience, at it's given altitude, to calculate the exhaust velocity?

(ISP . g) . ln(Mass when full/Mass when empty)

Is 'g' always equal to 9.81 in this equation, or do you use the actual gravitational acceleration that the booster will experience, at it's given altitude, to calculate the exhaust velocity?