Create Jetpack

Using brass you are able to upgrade your copper backtank to a jetpack,
using the pressurized air inside to propel yourself through the air.

Inspired by Simply Jetpacks,
this jetpack also has a hover mode.

Like the copper backtank, the jetpack does also go in the chest slot,
feeds air to items like the extendo-grip and can be enchanted with Capacity.
Just like the backtank it is charged by placing it down and supplying it with rotational force.

When underwater while sprint-swimming, the jetpack boosts your swimming speed.
Additionally, the hover-mode prevents you from floating downwards.

If a mod similar to Elytra Slot,
which enables equipping an elytra in addition to a chestplate,
the jetpack will instead give you firework-like boost while the player is pressing the UP-key.

Trinkets Support is possible by adding it via a datapack. Save to following to data/trinkets/tags/items/chest/back.json:

{
  "replace": false,
  "values": [
    "create_jetpack:jetpack"
  ]
}

If the back slot is not already enabled by another mod, save the following to data/trinkets/entities/flightlib.json:

{
  "entities": [
    "player"
  ],
  "slots": [
    "chest/back"
  ]
}