KSP is just what I have been looking for! A creative space simulator! Now if the team at Squad would just add little things like, ships, air balloons, zeplins, bombs, guns, missiles, subs, lasers, ground combat, animals, city/nation building, multiplayer, space colonies, space docks, space construction yards, asteroid mining, resources/economy... Hey, I can hope right? =)
Kerbals at War = OMG!!! *drools*
Units of measure
- While units of mass and thrust are not specifically labeled in-game, a bit of logic can quickly determine that thrust is measured in kilonewtons (kN) and mass in metric tons (t). For example, if measured in kilograms(kg), a "9 kg" Rockomax X200-16 Fuel Tank on Kerbin, having a surface gravity of 9.81 m/s2, would be roughly the size of a 48 oz coffee tin and only hold about 1.5 L of fuel. If measured in metric tons, a 9 t Rockomax X200-16 Fuel Tank under the same gravity would be about 0.67 m tall and 2 m in diameter, easily capable of holding the advertised 1600 L of fuel. Only a rocket engine with a thrust around 100 kN could have any chance to lift a 9 t fuel tank.
- Thrust to weight ratio at sea level on Kerbin is calculated by the following equation, which applies only to liquid or solid fuel rocket engines, jet engines use a complicated formula on a vehicle to vehicle basis.
- is the thrust is the thrust obtained from the engine, in kilonewtons.
- is the weight of the engine at sea level on Kerbin's surface.
- is the mass of the engine in metric tons (t).
- is the acceleration at sea level on Kerbin's surface, in m/s² (≈9.807 m/s²).
- Specific impulse at sea level on Kerbin is is calculated by the following equation.
Justification for t and kN (or 1000's kg and 1000's of N)
- An official NIST/SI publication: http://physics.nist.gov/Pubs/SP330/sp330.pdf states that kilonewton (kN) is a valid SI unit to represent 1000 N and ton (t), while historically a non-SI unit, has been accepted for use in the SI system by CIPM as a valid unit to represent 1000 kg for just over a century.
- We already know that the game uses SI units. These are specifically labeled: meters for units of distance, meters/sec for acceleration, liters for fuel volume, and liters/sec for fuel consumption.
- We know that the Mk1-2 Command Pod weighs 4 "units" from the in-game description. The command pod is roughly 2 m in height and 2 m in diameter. Calculating it's total volume gives us about 2.09 m3. Let's assume the capsule has 0.05 m (2 in) thick walls and subtract the interior void to get only the volume of the capsule walls. This gives us a volume of 1.80 m3.
- Knowing the volume of the walls, we can calculate the density of the material making up the capsule, taking the 4 in-game units to mean kg, this comes out to be about 13.79 kg/m3. Unfortunately, is about 72.29 times less dense than water at room temperature and closer in density to most gasses! Perhaps Kerbals have discovered a super strong gas-like substance to make spaceships from? =)
- However, if we take the 4 in-game units to mean metric tons, we get a density of around 13793.10 kg/m3, well within the range of the density of real building materials.
- The wikipage on Kerbin states it has a surface gravity of 9.81 m/s2, roughly that of Earth.
- Given this we can calculate the following. If measured in kilograms(kg), a "9 kg" Rockomax X200-16 Fuel Tank on Kerbin, having a surface gravity of 9.81 m/s2, would be roughly the size of a 48 oz coffee tin and only hold about 1.5 L of fuel. Unfortunately for our intrepid Kerbals, 1.5 L of fuel would not provide enough energy to lift a 9 kg payload through 75,000 m of atmosphere, much less a few hundred meters.
- If measured in metric tons, a "9 t" (9,000 kg) Rockomax X200-16 Fuel Tank under the same gravity, being about 0.67 m tall and 2 m in diameter, gives a volume of 2104.87 L, more than enough to hold the advertised 1600 L of fuel. Only a rocket engine with a thrust around 100 kN (100,000 N), could have any chance of lifting the 9 t (9,000 kg) fuel tank.
- Similarly, a substance weighing only 8 kg with a volume of 1,600 L has a density of 5 kg/m3, only about three times greater than the density of gaseous oxygen, and would not make an efficient fuel. Whereas, a fuel weighing 8 t with a volume of 1,600 L has a density of 5000 kg/m3, closer to a realistic rocket fuel.
- Currently testing column widths and categories to standardize and future proof part tables.
Template:Stats Table Command Pods
|Image||Part||Size||Cost ($)||Mass (t)||Drag||Max Temp (K)||Tolerance||Max SAS τ||Crew|
|Command Pod Mk1||Small||600||0.8||0.2||3400||14||5||1|
|Mk1-2 Command Pod||Large||1800||4||0.2||3400||45||5||3|
Template:Stats Table Liquid Fuel Engines
|Fuel (L/s)||Isp (s)||TVC|
|Image||Part||Size||Cost ($)||Mass (t)||Drag||Max Temp (K)||Tolerance||Thrust (kN)||T/W ratio||atm||vac||atm||vac||Gimbal (°)|
|Rockomax Mark 55 Radial Mount Liquid Engine||Radial Mounted||850||1.5||0.2||3600||7||120||8.2||8.7||7.4||280||330||1.0|
|LV-T30 Liquid Fuel Engine||Small||850||1.25||0.2||3600||7||215||17.5||13.7||11.8||320||370||-|
|LV-T45 Liquid Fuel Engine||Small||950||1.5||0.2||3600||7||200||13.6||12.7||11.0||320||370||1.0|
|LV-909 Liquid Fuel Engine||Small||750||0.5||0.2||3600||7||50||10.2||3.4||2.6||300||390||0.5|
|Toroidal Aerospike Rocket||Small||850||1||0.2||3600||20||250||25.5||13.1||13.1||390||390||-|
|Rockomax "Poodle" Liquid Engine||Large||600||2.5||0.2||3600||7||220||9.0||16.6||11.5||270||390||2.5|
|Rockomax "Mainsail" Liquid Engine||Large||850||6||0.2||3600||7||1500||25.5||109.3||92.7||280||330||1.0|
|LV-N Atomic Rocket Engine||Small||1700||2.25||0.2||4000||12||60||2.7||5.5||1.5||220||800||1.0|
Template:Stats Table Solid Fuel Boosters
|Solid Fuel Density is 1273-1910 kg/m3 - (Sepratron 1 fuel density is 31831 kg/m3)||Mass (t)||T/W ratio|
|Image||Part||Size||Cost ($)||Full||Empty||Drag||Max Temp (K)||Tolerance||Thrust (kN)||Full||Empty||Burn (s)||Isp (s)|
|RT-10 Solid Fuel Booster||Small||450||3.5||0.5||0.3||3600||7||250||7.3||51.0||25||212|
|Rockomax BACC Solid Fuel Booster||Small||800||6.75||0.75||0.3||3900||7||550||7.6||68.0||30||280|
|Sepratron I||Radial Mounted||100||0.15||0.05||0.3||3600||7||20||13.6||40.8||5||102|
Template:Stats Table Jet Engines
|Image||Part||Size||Cost ($)||Mass (t)||Drag||Max Temp (K)||Tolerance||Thrust (kN)||T/W ratio||Fuel (L/s)||atm||Gimbal (°)||Airflow||Size||Power|
|Basic Jet Engine||Small||950||1||0.2||3600||7||100||10.2||0.3||1456 stall - 7282 max||2.5||200||1.1||125|
|TurboJet Engine||Small||950||1.2||0.2||3600||7||150||12.7||0.4||546 stall - 8192 max||2.5||60||1.0||200|