Functions
Optional[FrozenSet[str]]	vehicle_ids (Any diagram)
List[Any]	on_vehicle (Iterable[Any] nodes, Optional[FrozenSet[str]] vehicle)
List[Any]	off_vehicle (Iterable[Any] nodes, Optional[FrozenSet[str]] vehicle)
Tuple[Dict[str, Any], List[str]]	vehicle_payload (Dict[str, Any] payload)

Detailed Description

Which part of a drawing is the vehicle.

A stand drawing can carry its ground support on the same sheet: pid-designer draws the rocket on one
page and the GSE on another, joined only by quick-disconnects paired across the pages
(``options.pairedWith``). The feed twin mates those pairs into one network, because filling the
vehicle is what the GSE is for. Layer X burns the vehicle: its propellant tanks are the tanks that
feed the engine and its pressurant bottle is the bottle that presses them, not a GSE fuel-transfer
tank or a 49 L K-bottle on the cart that happen to hold the same fluids.

The vehicle is everything joined to the engine by a drawn line, walked through any symbol. A paired
disconnect is not a drawn line, so the walk stops at the coupling, which is where the vehicle ends.
A drawing whose GSE is drawn with lines into the vehicle, or that has no GSE, is one piece and the
whole drawing is the vehicle: every drawing that ran before reads exactly as it did.

Function Documentation

◆ off_vehicle()

List[Any] engine.layerx.vehicle.off_vehicle	(	Iterable[Any]	nodes,
		Optional[FrozenSet[str]]	vehicle )

``nodes`` that are ground support (not joined to the engine by a line).

Definition at line 39 of file vehicle.py.

◆ on_vehicle()

List[Any] engine.layerx.vehicle.on_vehicle	(	Iterable[Any]	nodes,
		Optional[FrozenSet[str]]	vehicle )

``nodes`` that are on the vehicle; all of them when the drawing has no engine to scope by.

Definition at line 33 of file vehicle.py.

◆ vehicle_ids()

Optional[FrozenSet[str]] engine.layerx.vehicle.vehicle_ids ( Any diagram )

The ids of every symbol joined to an ENGINE by drawn lines, or None without an engine.

The physics library's rule (:func:`feedtwin.pid.roles.vehicle_ids`), so the cockpit and Layer X
never disagree about which tank is the vehicle's.

Definition at line 22 of file vehicle.py.

Referenced by vehicle_payload().

◆ vehicle_payload()

Tuple[Dict[str, Any], List[str]] engine.layerx.vehicle.vehicle_payload ( Dict[str, Any] payload )

``payload`` cut to the vehicle, and the labels of the ground-support vessels left out.

Layer X primes the vehicle itself -- the loads, the bottle's fill, the regulator's dome -- which
is what the GSE is for, and then fires it. Left in, a GSE page mated through its paired
disconnects keeps working the vehicle during the burn: on LE4 the GSE dome regulator, mated to
the vehicle's dome line, loaded the press regulator past Layer X's lockup and tripped the LOX
tank at 802 psig before T-0. Cut, each vehicle-side disconnect half is capped, as a stand with
its GSE unplugged has it. A drawing that is one piece comes back unchanged (the same object).

Definition at line 44 of file vehicle.py.

References vehicle_ids().