4. Glossary

Orbital parameters

Geometric elements to locate a Keplerian orbit (two-body problem).

Staging

Breakdown of the launcher into several propulsion stages.

Indice constructif or structural; structural index

Ratio between the dry mass and the propellant mass of a stage.

Impulsion spécifique dans le vide; vacuum specific impulse

Ratio between empty thrust and weight flow (with g ₀ = 9.80665 m/s ² ).

Pilotability

Ability to control angular movement.

Point constraint; interior point constraint

Constraint applied at a given date....