Struct Separation 

pub struct Separation {
    pub trigger: Trigger,
    pub after_stage: usize,
    pub drops_burning: bool,
}

A separation: the stack comes apart at a stage boundary and every body descends under its own devices (docs/physics/recovery.md, and the decision record on separation, ADR-014).

Bodies are contiguous runs of stages. Stages 0..=after_stage keep the nose and are body 0; the stages aft of the split are body 1. Each body flies as a point mass from the separation, with the mass properties of its own stages and motors, so every body must carry at least one device: the descent phase has no airframe drag (the decision record on recovery, ADR-012), and a body with nothing open would fall as if in a vacuum.

A separation is an ideal one: no impulse, so each body leaves with the velocity its own center of mass already had. The aft body’s motors must have burned out by then, because a body’s mass is taken as constant through its descent, unless the separation may drop one burning (Separation::drops_burning). When the nose’s body still has a motor to burn, it is a sustainer: it flies on as a rigid body on its own stages’ aerodynamics, and only the aft body descends as a point mass (the decision record on staging, ADR-074).

Fields

trigger: Trigger

When the stack comes apart.

after_stage: usize

The last stage that stays with the nose. Stages after it form the aft body.

drops_burning: bool

Whether, when it is powered (Self::powered_at), it may drop a motor that still burns, as OpenRocket’s first burnout of a stage drops the stage’s other motors (the decision record on a stage’s first burnout, ADR-172). The dropped body’s descent is a point mass with no thrust, so it leaves out the impulse that motor had left (BodyFlight::impulse_left_n_s). Off by default: then the aft body’s motors must have burned out by the separation. A motor still to light is refused either way, and so is any in an unpowered separation’s aft body.

Implementations

impl Separation

pub const BODIES: usize = 2

How many bodies it makes: two.

pub const fn new(trigger: Trigger, after_stage: usize) -> Separation

A separation at the boundary after after_stage, on trigger.

pub const fn dropping_burning(self) -> Separation

The same separation, let drop a motor that still burns when it is powered (Self::drops_burning).

pub const fn stages_of( &self, index: usize, stage_count: usize, ) -> Option<(usize, usize)>

The stages of body index: body 0 keeps the nose, body 1 is the rest. None when there is no such body, including when the boundary is at or past the last stage.

pub fn powered_at(&self, assembly: &Assembly, time_s: f64) -> bool

Whether it is powered when it fires at time_s, as the flight decides for the first separation it flies: a motor of the nose’s body (stages 0..=after_stage) burns then, or lights later at a known time, counting one this separation lights. A powered separation’s nose body flies on as a rigid body on its own stages’ aerodynamics (the decision record on staging, ADR-074); an unpowered one’s descends as a point mass with only its devices’ drag, as every body does (the decision record on separation, ADR-014).

pub fn body_of(separations: &[Separation], stage: usize) -> usize

The body stage stage rides once every one of separations (in the order they fire, as crate::Simulation::with_separations takes them) has fired: body k + 1 for the first separation k it is aft of, the part that separation drops; body 0, the nose’s, for a stage aft of none.

pub fn stages_of_body( separations: &[Separation], body: usize, stage_count: usize, ) -> Option<(usize, usize)>

The stages of body body once every one of separations has fired, in a design of stage_count stages: body 0 keeps the nose, and body k + 1 is the stages separation k drops, from its boundary back to the one behind it (or the tail). None when there is no such body, including when a boundary is at or past the last stage, or the boundaries don’t move forward in the order given.

Trait Implementations

impl Clone for Separation

fn clone(&self) -> Separation

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Separation

impl Debug for Separation

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Separation

fn deserialize<__D>( __deserializer: __D, ) -> Result<Separation, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Separation

fn eq(&self, other: &Separation) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Separation

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Separation