﻿ SES
 Space mission calculation Input of mission specifications Energy density Joules/Kg Acceleration rate meters/second Length meters Fuel mass Kg Mass Kg Tare weight Kg Total ejections Times Maximum speed Meter/second Sequence time Second X value Kg.m^2/s^2 Y value m^2/s^2 or J/Kg Z value None Result Efficiency Sequences Distance Total acceleration time Energy density: Energy density of fuel. For example, Methane or natural gas has energy density of specific energy or 55.5 MJ/kg. Acceleration rate: Vehicle acceleration rate. You can input a figure from 0 m/s2. For 1 g acceleration, it is 9.81 m/s2 Length: Propellant acceleration length. This is the distance when propellant being pushed out of a vehicle in a space vacuum. Fuel mass: Fuel mass. This is the total fuel carried by a mission. The unit for fuel is Kg. Fuel mass and fuel density decide the total energy a mission can utilize. Mass: Total mass before a mission starts. The unit for this is Kg. Tare weight: Tare weight is the vehicle without fuel. The uit for this is Kg. X value: X = aLM Y value: Y=aL+Ed Z value: Z=Ed/Y Total ejections: This output is the total mass ejections for a mission. Half of this sequence is for acceleration, and half of the sequences is for deceleration. Preferably this shall be even numbers. Maximum speed: This is the maximum velocity a vehicle can achieved based on energy density, vehicle tare weight and fuel carried. Mission acceleration rate and propellant acceleration distance is irrelevant. Sequence time: Sequence time T is the propellant acceleration time in the distance given by the vehicle. Please refer to equation 10 for more detail. Result: This so called "result" is not important as long as the number is bigger than zero. It must satisfy equation 34. Efficientcy: This is the fuel efficiency based on how much distance the space vehicle is accelerated by the total acceleration length. The equation is ŋ=0.5*(acceleration rate)*(Sequence time)^2/Length Sequences: The number is half of mission total alllowed propellant ejections. It must satisfy equation 34. Bigger sequences will not stop a vehicle at the end of a mission. Distance: This is the distance a vehicle will travel when acceleration and decceleration happen. It doesn't take into account distrance a vehicle travel at constant velocity. Unit is Km. Total acceleration time: This is the duration a vehicle will accelerate or deccelerate for a mission. It is expressed as T times n. Unit is seconds.