Calcolatore Impulso Specifico — Formula

Specific Impulse

Specific impulse (Isp) measures rocket engine efficiency: how much thrust per unit weight of propellant consumed per second.

Formula

Isp = ve / g0

  • *ve* = effective exhaust velocity (m/s)
  • *g0* = 9.80665 m/s2 (standard gravity)

    • Higher Isp means more efficient use of propellant. Chemical engines: 200-450 s. Ion engines: 1500-5000 s.

    Esempio Risolto

    Engine with exhaust velocity 3000 m/s.

    1. Isp = ve / g0
    2. Isp = 3000 / 9.80665
    3. Isp = 305.9 s