scifi:spacecraft

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scifi:spacecraft [2019/12/22 13:43] sam |
scifi:spacecraft [2020/04/26 10:27] (current) sam |
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===== Definitions ===== | ===== Definitions ===== | ||

- | **Mass**: Total size of the vehicle, in //dt is 14m³ (one tonne of liquid hydrogen), and is assumed to have an actual mass of 1 tonne. | + | **Displacement**: Total size of the vehicle, in //(dT). Each dT is 14m³ (one tonne of liquid hydrogen), and by default is assumed to have an actual mass of 1 tonne, though this can vary depending on the configuration. |

+ | | ||

+ | **Mass**: The actual mass of the vehicle in metric tonnes. This can get complicated,. | ||

**Thrust**: How powerful a drive is, per displacement tonne. The higher this is, the faster a spacecraft can accelerate. This is based on Newtons of force produced by the drive, multiplied by a magic number. | **Thrust**: How powerful a drive is, per displacement tonne. The higher this is, the faster a spacecraft can accelerate. This is based on Newtons of force produced by the drive, multiplied by a magic number. | ||

**Impulse**: | **Impulse**: | ||

+ | |||

+ | **Delta-vee**: | ||

The **Total Thrust** is the thrust of the engines times their total mass. | The **Total Thrust** is the thrust of the engines times their total mass. | ||

The **Acceleration** is the **Total Thrust** divided by the **Ship Mass**, in m/s². | The **Acceleration** is the **Total Thrust** divided by the **Ship Mass**, in m/s². | ||

+ | |||

^ Engine | ^ Engine | ||

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**Total Wet Mass** is equal to the ship **Mass**, plus the mass of fuel times its density. | **Total Wet Mass** is equal to the ship **Mass**, plus the mass of fuel times its density. | ||

+ | |||

+ | Full statistics for some future designs are available here: | ||

+ | * [[./ | ||

==== Mass ==== | ==== Mass ==== | ||

- | In // | + | In //considers this the ship's displacement, which is basically its volume. |

- | | + | |

- | **YAGS SciFi** also uses //the basic rating for a ship, but a ships //actual mass// is how massive it is in //tonnes//. | + | |

Each // | Each // | ||

+ | |||

+ | Some craft are //Weak//, in which case total dry mass (including engines, living quarters, cargo hold etc) is multiplied by 0.75. This also has a negative impact on the hull strength of the ship (base soak x0.50). | ||

+ | |||

+ | Some are // | ||

=== Cargo === | === Cargo === | ||

- | The first is cargo space, which when full will count as 10,000kg per // | + | The first is cargo space, which when full can contain 10,000kg per // |

- | Each dt of cargo being carried therefore counts as +10dt to the ship's actual mass. | + | An empty cargo hold has a mass of 100kg per dT, since it is mostly empty space. When loaded with cargo, the mass of the cargo is in addition to this. |

=== Fuel === | === Fuel === | ||

The second is fuel, which is often a liquid (sometimes solid) which completely fills the fuel tank with no space left over. Like cargo, fuel also has a density and so a full fuel tank increases the mass of the ship. Water counts as +14 per dt (14m³ of water has a mass of 14 tonnes, by definition), | The second is fuel, which is often a liquid (sometimes solid) which completely fills the fuel tank with no space left over. Like cargo, fuel also has a density and so a full fuel tank increases the mass of the ship. Water counts as +14 per dt (14m³ of water has a mass of 14 tonnes, by definition), | ||

+ | |||

+ | An empty fuel tank has a mass of 100kg per dT, again since it is mostly empty space. | ||

=== Supplies === | === Supplies === |

scifi/spacecraft.1577022185.txt.gz · Last modified: 2019/12/22 13:43 by sam