Post by sage on Aug 16, 2021 16:03:56 GMT
One of the questions that come up from time to time is whether our crew modules are accurate. This is something that I’ve taken time out to investigate and now have serious concerns about the accuracy of our crew module.
Children of a dead earth takes the assumption that our crew accommodations are similar to the crew accommodations on board modern or Cold War submarines. Now it is extremely common in the engineering practice to make assumptions. Which are then normally covered by a factor of safety when these assumptions cannot be guaranteed. But after looking more in detail about the necessary accommodations needed in space I’m beginning to have serious questions on whether this assumption can be made at all.
Space stations have the same requirements for habitability as spacecraft. So when checking on the habitability of spacecraft I checked them against the habitability of space stations.
Here two paper I used my researching of the subject
Minimum Acceptable Net Habitable Volume for Long-Duration Exploration Missions
Astronaut Balance for Long Duration Mission
As you can see from “Astronaut Balance for Long Duration Mission” paper, page 7. 95% of astronauts need 0.96 kg of food solids with an additional 0.96 kg in water in launched foods. That a total of 1.92 kg of food per day, per person. Form the games developer own blog we know that the default provisions is 6 months. 6 months X 30 Day a month X 1.92 kg comes to 345.6 kg of food needed for a 6 month op.
There is also the matter of oxygen. From “Astronaut Balance for Long Duration Mission” paper, page 7. 95% of astronauts need 0.61 kg of oxygen per day. Form the games developer own blog we know that the default missions last 6 months. 6 months X 30 Day a month X 0.61 kg comes to 109.8 kg of oxygen needed for a 6 month op.
For some reason I can not upload the Screen shot from my steam file to Children of a dead earth forum. To show you what I got for a 1 man crew module. but the game gave me a module that was
Height =2.3 m
Radius = 83.5 cm
Mass = 2.77 t With most of it being aluminum
From what I was able to find out from you guys, the humans in the game weigh 59kg. I want you to look at the pie chart for a module with only one human. Now the food section of the pie chart should be bigger the human section of the pie chart on mass. As 345.6 kg is much larger than 59 kg. And the oxygen part of the pie chart should also be bigger than the human section of the pie chart. As 109.8 kg is more than 59 kg.
What do you guy see.
Also note that we have at least two missions that last long the six month in the game. One where we have to bring food an out of fuel warship in 6 months. Which means we are almost out of food before we get there and other mission to Mars that take a little under two years.
Also I can't tell form the pie chart how much water we are given. If anyone is a modder or can see the code and give us exact numbers for weight for one human and what the game gives us in food, oxygen and water for the one human, it would be appreciated.
Second let’s look at the amount of Net Habitable space.
From the paper “Minimum Acceptable Net Habitable Volume for Long-Duration Exploration Missions”. We know the minimum habitable space need for a long range space mission is 25m^3, see page 9.
Now from International Space Station Facts and Figures | NASA (www.nasa.gov)
The International space Station is listed having a
• Habitable Volume: 13,696 cubic feet (388 cubic meters) not including visiting vehicles
• Pressurized Volume: 32,333 cubic feet (916 cubic meters)
• Mass: 925,335 pounds (419,725 kilograms)
Pressurized Volume is the Volume of the Station with air, and the Habitable Volume is the Volume that the crew can live in. Computer and other equipment take up space which is why the Habitable Volume is smaller than the Pressurized Volume
As you can see habitable space is only 42% that of pressurized space. And from this we would be able to find out that we would need about 60m^3 of pressurized space to hold 25 m^3 (42% of the pressurized space) of Habitable space.
And we know that the modules in game are pressurized space with habitable space inside. Because there is a depressurized error message if we make the walls too thin. Let’s look again at one man crew module.
Does it come to 60 m^3?
The volume of a cylinder is Volume = height X Radius ^ 2
What I got was 5.038 m^3. What did you guy get?
Children of a dead earth takes the assumption that our crew accommodations are similar to the crew accommodations on board modern or Cold War submarines. Now it is extremely common in the engineering practice to make assumptions. Which are then normally covered by a factor of safety when these assumptions cannot be guaranteed. But after looking more in detail about the necessary accommodations needed in space I’m beginning to have serious questions on whether this assumption can be made at all.
Space stations have the same requirements for habitability as spacecraft. So when checking on the habitability of spacecraft I checked them against the habitability of space stations.
Here two paper I used my researching of the subject
Minimum Acceptable Net Habitable Volume for Long-Duration Exploration Missions
Astronaut Balance for Long Duration Mission
As you can see from “Astronaut Balance for Long Duration Mission” paper, page 7. 95% of astronauts need 0.96 kg of food solids with an additional 0.96 kg in water in launched foods. That a total of 1.92 kg of food per day, per person. Form the games developer own blog we know that the default provisions is 6 months. 6 months X 30 Day a month X 1.92 kg comes to 345.6 kg of food needed for a 6 month op.
There is also the matter of oxygen. From “Astronaut Balance for Long Duration Mission” paper, page 7. 95% of astronauts need 0.61 kg of oxygen per day. Form the games developer own blog we know that the default missions last 6 months. 6 months X 30 Day a month X 0.61 kg comes to 109.8 kg of oxygen needed for a 6 month op.
For some reason I can not upload the Screen shot from my steam file to Children of a dead earth forum. To show you what I got for a 1 man crew module. but the game gave me a module that was
Height =2.3 m
Radius = 83.5 cm
Mass = 2.77 t With most of it being aluminum
From what I was able to find out from you guys, the humans in the game weigh 59kg. I want you to look at the pie chart for a module with only one human. Now the food section of the pie chart should be bigger the human section of the pie chart on mass. As 345.6 kg is much larger than 59 kg. And the oxygen part of the pie chart should also be bigger than the human section of the pie chart. As 109.8 kg is more than 59 kg.
What do you guy see.
Also note that we have at least two missions that last long the six month in the game. One where we have to bring food an out of fuel warship in 6 months. Which means we are almost out of food before we get there and other mission to Mars that take a little under two years.
Also I can't tell form the pie chart how much water we are given. If anyone is a modder or can see the code and give us exact numbers for weight for one human and what the game gives us in food, oxygen and water for the one human, it would be appreciated.
Second let’s look at the amount of Net Habitable space.
From the paper “Minimum Acceptable Net Habitable Volume for Long-Duration Exploration Missions”. We know the minimum habitable space need for a long range space mission is 25m^3, see page 9.
Now from International Space Station Facts and Figures | NASA (www.nasa.gov)
The International space Station is listed having a
• Habitable Volume: 13,696 cubic feet (388 cubic meters) not including visiting vehicles
• Pressurized Volume: 32,333 cubic feet (916 cubic meters)
• Mass: 925,335 pounds (419,725 kilograms)
Pressurized Volume is the Volume of the Station with air, and the Habitable Volume is the Volume that the crew can live in. Computer and other equipment take up space which is why the Habitable Volume is smaller than the Pressurized Volume
As you can see habitable space is only 42% that of pressurized space. And from this we would be able to find out that we would need about 60m^3 of pressurized space to hold 25 m^3 (42% of the pressurized space) of Habitable space.
And we know that the modules in game are pressurized space with habitable space inside. Because there is a depressurized error message if we make the walls too thin. Let’s look again at one man crew module.
Does it come to 60 m^3?
The volume of a cylinder is Volume = height X Radius ^ 2
What I got was 5.038 m^3. What did you guy get?