propulsion
the act of propelling
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise an act of propulsion, assess how it produces or maintains motion, and identify feasible adjustments within stated operating limits.
Propulsion is the act or process of producing a driving force that moves a body or sustains its motion through interaction with its surroundings or the expulsion of reaction mass.
It can be Identify a propulsion episode and link it to the propelled body and force-producing participants.; Explain the interaction through which the driving force reaches the propelled body.; Assess whether propulsion is accelerating the body, maintaining motion or failing to achieve its intended effect.; Compare propulsion performance under compatible operating conditions and measurement boundaries.; Evaluate adjustments to force, direction or timing against available energy and operating limits.; Identify missing observations needed to distinguish ineffective propulsion from absent propulsion..
Distinguishing features
Identify an interaction supplying a driving force; observed movement alone does not establish that propulsion is occurring.
Treat propulsion as an activity with an operating interval, rather than as the engine or other device capable of performing it.
Record applied driving force separately from net force: propulsion may maintain speed while other forces oppose motion.
Distinguish propulsion from steering and braking by the force's role in the episode, while allowing one mechanism to perform several roles.
Do not require self-propulsion: record whether the driving action originates within the propelled system or comes from an external participant.
Scope
+ The propelled body, propelling participant or mechanism, and boundaries of a propulsion episode
+ Driving-force generation and transfer through contact, surrounding media, expelled material or other specified interactions
+ Energy supplied, converted and expended during propulsion
+ Control of propulsion magnitude, direction and timing
+ Motion effects, propulsion performance and operating constraints
- Construction and component inventories of engines, motors, propellers and other propulsion devices
- The complete design and condition of the propelled vehicle, organism or object
- Navigation, route selection and the wider transport mission
- Fuel manufacture, energy infrastructure and upstream resource supply
- Motion without an identified propelling interaction
- Figurative propulsion of careers, ideas or organisations
Characteristics
- Propelled system
- Body or aggregate being propelled, with an explicit system boundary Determines which forces, energy transfers and motion observations belong to the activity.
- Propelling participant
- Organism, device or external actor performing the driving action Separates the act from its performer and distinguishes internal from external propulsion.
- Force-transfer mechanism
- Contact traction or push; interaction with a fluid; expelled material; field-mediated interaction; other specified; unresolved Identifies what the act interacts with and which operating conditions constrain force production.
- Driving force
- Vector in N, with reference frame, application location and time basis Supports assessment of acceleration, resistance compensation and directional effects.
- Propulsion operating state
- Starting; active; modulating; stopping; interrupted; completed; unknown Distinguishes an ongoing act from available capability or a command that has not produced force.
- Energy input
- J per episode or W over a stated interval, with the energy boundary identified Supports endurance and resource assessments without conflating stored energy with delivered mechanical energy.
- Velocity of the propelled system
- Vector in m/s relative to a specified frame or medium Connects propulsion to motion while making frame-dependent performance measures interpretable.
- Propulsion performance measure
- Named measure with units, calculation, operating point and system boundary Allows comparisons only when quantities such as efficiency, impulse or energy per distance have compatible meanings.
- Operating envelope
- Applicable force, power, speed, traction, thermal, environmental and resource limits Determines which propulsion adjustments are feasible under current conditions.
Analytical facets
- substance
- activity
- origin
- conceptual
- agency
- inert
- mobility
- not-applicable
- scale
- not-applicable
- affordances
- observable
Also called
+56
Where this came from
oewn:2024 · CC BY 4.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 16 findings · 29 questions.
Propulsion episode Identifies what is being propelled, what performs the act and when the act occurs.
Propulsion must be recognisable as an activity rather than inferred from the presence of a device or from movement alone.
Participants and system boundary
Establishes the body receiving the driving action and the participants supplying it.
Propelled body and propelling participant
Record the propelled system separately from the actor or mechanism applying the driving force, including whether that participant lies inside the system boundary.
- Which body or aggregate is being propelled, and where is its system boundary drawn? definition
- Which participant supplies the driving action, and is it internal or external to that boundary? boundary
Episode and force role
Distinguishes active propulsion from capability, coasting and other force-producing activities.
Evidence of active propulsion
Record the observations and adopted criterion that establish the start, continuation and end of propulsion, including its relationship to braking or steering.
- What observed interaction establishes that propulsion is active, and what marks its start and end? measurement
- When the same mechanism drives, steers or brakes, which criterion assigns its role during this interval? boundary
Driving interaction Explains how driving force is generated and transferred to the propelled system.
The interaction distinguishes propulsion mechanisms and identifies dependencies that a device name alone cannot establish.
Interaction partner
Identifies the surface, medium, expelled material or other system participating in force transfer.
Force-transfer path
Record how the mechanism exchanges momentum with its surroundings or another body, including the physical conditions required for that interaction.
- Through what contact, medium, expelled material or other specified interaction is the driving force produced? definition
- Which observations or technical account support the identified force-transfer path? provenance
Force application
Characterises the magnitude, direction, location and temporal pattern of the driving force.
Applied driving force
Record the propulsion force separately from resultant force, with enough spatial and temporal detail to interpret its motion effects.
- What driving-force vector is applied, at what location, and in which reference frame? measurement
- Is force continuous or intermittent, and what interval supports any reported average or impulse? measurement
Energy and expenditure Connects the driving action to energy supply, conversion and resource consumption.
An agent needs to distinguish force production from energy availability and determine how long the act can continue.
Energy path
Tracks energy entering the propulsion activity and reaching the driving interaction.
Input and conversion boundary
Identify the energy source and conversion stages included in the assessment, distinguishing source energy from energy delivered at the propulsion interface.
- What energy source sustains propulsion, and which conversion stages lie inside the assessment boundary? boundary
- How much energy or power enters that boundary during the stated operating interval? measurement
Resource use and performance
Relates resource expenditure to a defined propulsion result.
Comparable performance measure
Record a mechanism-appropriate measure of expenditure or performance, including its definition and conditions rather than assuming one efficiency measure fits every case.
- Which performance measure is appropriate here, and what are its calculation, units and reference frame? definition
- What resource consumption and delivered result were measured at the same operating point? measurement
- What duration or further propulsion effort can the remaining resources support under stated assumptions? action
Propulsion control and limits Describes how propulsion can be changed and what constrains those changes.
Available commands do not guarantee delivered force; action selection requires the response and limits of the actual driving interaction.
Command-to-force response
Links controllable inputs to changes in propulsion magnitude, direction and timing.
Available propulsion adjustments
Record the inputs that alter propulsion and the observed or supported response, including delays and limits on the rate of change.
- Which inputs can start, stop, increase, reduce or redirect the driving force? action
- What delay, rate limit or variability separates an input change from delivered force? measurement
Interaction and equipment limits
Identifies constraints imposed by the force-transfer interaction, the performer and current conditions.
Feasible driving envelope
Record applicable constraints such as available traction, medium conditions, power, temperature or fatigue, together with evidence that a limit is approaching.
- Which current conditions limit the magnitude, direction or duration of propulsion? measurement
- What evidence supports each operating limit and indicates whether it has been reached? provenance
- Which adjustment remains feasible when a limiting condition is approached? action
Motion effect and effectiveness Assesses what propulsion contributes to motion and whether it achieves the episode's intended result.
Propulsion may sustain speed, oppose disturbances or produce little observed movement, so effectiveness cannot be judged from acceleration alone.
Force balance and motion
Relates the driving contribution to resistance, other external forces and observed movement.
Propulsion contribution to motion
Record driving force and other relevant forces separately, then relate their combined effect to the propelled system's measured motion.
- What velocity and acceleration are observed in the specified frame during propulsion? measurement
- Which opposing or assisting forces explain the difference between applied driving force and observed motion? measurement
Achieved effect and shortfall
Evaluates the intended propulsion result and distinguishes failure to generate force from failure to obtain the desired motion.
Effectiveness and diagnostic evidence
Compare the intended effect with force and motion observations, retaining uncertainty where resistance, poor coupling or unavailable power cannot yet be distinguished.
- What intended effect defines success for this episode, and was it achieved? measurement
- Which observation would distinguish absent driving force from force that is counteracted or poorly transferred? action
- Does the evidence support continuing, adjusting or ending propulsion, and under which operating constraints? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This is recalled knowledge, not source-verified research; no universal identifier or standard for the act itself is asserted.
- The kinds listed overlap and illustrate established distinctions rather than a single exhaustive taxonomy.
- Efficiency definitions and applicable safety regulations require a specified mechanism, application and system boundary.
- Which of these check these first hold for the sense of propulsion this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Ground-contact propulsion through wheels, tracks or limbs
- Propeller or rotor propulsion
- Jet propulsion
- Rocket propulsion
- Biological swimming propulsion
- Sail propulsion
- Which of these kinds and varieties hold for the sense of propulsion this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Moving road and rail vehicles through traction.
- Driving ships and underwater vehicles.
- Sustaining powered flight in aircraft.
- Launching spacecraft and changing their trajectories.
- Moving organisms through walking, swimming or flying.
- Which of these real-world use hold for the sense of propulsion this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Propulsive force or thrust - Depends on the body, mechanism and operating conditions; no general range applies. - N
- Propulsive power - Depends on force and velocity; no general range applies. - W
- Total impulse - Depends on thrust history and duration; no general range applies. - N·s
- Propulsive efficiency - 0-1 for conventional useful-power-to-input-power definitions with consistent system boundaries. - dimensionless
- Which of these typical measurements hold for the sense of propulsion this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Insufficient propulsive force to overcome resistance or maintain the required trajectory.
- Uncommanded or asymmetric force causing loss of directional control.
- Loss of traction or ineffective coupling to the surrounding medium.
- In powered systems, mechanical failure, overheating or interruption of the energy supply.
- Mechanism-dependent exposure to rotating parts, exhaust, pressure waves or expelled material.
- Which of these failure modes and hazards hold for the sense of propulsion this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- motion - Motion is a change in position; it can continue by inertia without ongoing propulsion.
- thrust - Thrust is a force; propulsion is the process in which a driving force is produced and applied.
- locomotion - Locomotion is movement from place to place, especially by an organism; propulsion describes the force-producing action that enables it.
- propulsion system - A propulsion system is the physical equipment that performs propulsion; this entry describes the act.
- traction - Traction transmits driving force through contact with a surface and is one means of propulsion.
- acceleration - Acceleration is a change in velocity resulting from net force; propulsion may instead balance resistance at constant velocity.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of propulsion this model covers, and on what evidence? provenance
What the second pass must settle
- Should the registry's broad definition include every external push and tow, or do neighbouring activity models establish a narrower boundary?
- How should gravity-driven and buoyancy-driven movement be classified when there is no separately identifiable active propelling mechanism?
- Does force production against a fixed restraint count as an actual propulsion episode or as a test of propulsion capability?
- Where should the boundary fall between propulsion, braking and station-keeping when one mechanism changes roles within an episode?
- Which performance measures support useful comparisons across biological, contact-based, fluid-based and expelled-material propulsion without obscuring their different system boundaries?