Nasa

NASA is calling!

This program is used by NASA to calculate their mission fuel expense. As such it is thoroughly tested and documented!

How to use??

Lets start by running iex -S mix

# First is mission payload weight (weight is in kg)
# Let's say our payload is 28801 kg
iex> payload_weight = 28801
# After that we will define our trip
# Let's say you want to go to the Moon and back
# Our trip would look like this:

# -> LAUNCH from Earth
# -> LAND on Moon
# *do your space stuff|take few pics|jump around|play golf*
# -> LAUNCH from Moon
# -> LAND on Earth

# In order to LAUNCH and LAND we need to know
# gravitational acceleration of the planet or g
# Earth's g is = 9,807 m/s²
# Moon's g is = 1,62 m/s²
iex> earth_g = 9.807
iex> moon_g = 1.62
# Now lets define our trip by creating a list of launch-land cycles
# To do so we create a list with launch/land and planets g
# So if we want to launch from Earth we write [:launch, earth_g]
iex> trip = [{:launch, earth_g}, {:land, moon_g}, {:launch, moon_g}, {:land, earth_g}]
# And now we calculate the fuel required
iex> Nasa.calculate(payload_weight, trip)
"51898 kg"
# Now lets try a couple more
# Trip to the Mars and back
iex> payload_weight2 = 14606
iex> trip2 = [{:launch, 9.807}, {:land, 3.711}, {:launch, 3.711}, {:land, 9.807}]
iex> Nasa.calculate(payload_weight2, trip2)
"33388 kg"
# Passenger mission
# Earth -> Moon -> Mars -> Earth
iex> payload_weight3 = 75432
iex> trip3 = [{:launch, 9.807}, {:land, 1.62}, {:launch, 1.62}, {:land, 3.711}, {:launch, 3.711}, {:land, 9.807}]
iex> Nasa.calculate(payload_weight3, trip3)
"212161 kg"

Installation

If available in Hex, the package can be installed by adding nasa to your list of dependencies in mix.exs:

def deps do
  [
    {:nasa, "~> 0.1.0"}
  ]
end

Documentation can be generated with ExDoc and published on HexDocs. Once published, the docs can be found at https://hexdocs.pm/nasa.