Parts catalog

Lothal’s catalog is plain JSON in the repository’s data/parts/ folder, one file per category. Every number in it has a source.

The fifteen files

File	Category
antennas.json	Video antennas
batteries.json	Battery packs (LiPo and Li-ion)
buzzers.json	Buzzers
cameras.json	FPV cameras
capacitors.json	Capacitors across the ESC input
connectors.json	Battery connectors
escs.json	ESCs
flight_controllers.json	Flight controllers
frames.json	Frames
gps.json	GPS modules
guards.json	Prop guards
motors.json	Motors
propellers.json	Propellers
receivers.json	Receivers
vtxs.json	Video transmitters

antennas.json holds video antennas only. A receiver’s antenna is part of the receiver’s entry.

What every part carries

Each file has a _schema note explaining its fields, then a parts list. Every part has:

Field	What it is
part_id	A unique id, such as motor_2207_1960kv.
name	The name shown in the app.
category	Which kind of part it is.
mass_g	Mass in grams.
specs	The figures the physics uses.
catalog	Browsing information only (size class, intended use and so on), used for the finder’s filters. Never used by the physics.
source	Where the figures came from. Required.

Some categories carry more. Parts that bolt on have a mounting block. Motors have a mount_pattern and a thrust_test, which names the propeller and voltage the motor’s thrust figure was measured with, so the thrust coefficient can be fitted from real data. A motor can also carry a validation block: independently measured points on a different propeller or voltage, which the thrust bench checks the model against.

The source rule

A figure without a source is not added. Where a part is typical of its class rather than one product, its source says so, for example “representative 0802 whoop motor thrust table”. The _schema note in each file gives the details for that category.

Browse the files on GitHub. To add a part, see Adding a part.