Source: Roblox Creator Hub · CC BY 4.0 · View source · Code samples: MIT Imported 2026-10-03. Formatting adapted for this site.
RocketPropulsion
Inherits from: BodyMover → Instance → Object
The RocketPropulsion object applies force on an assembly so that it both follows and faces a target. It acts like a hybrid of BodyPosition and BodyGyro. Unlike other BodyMovers, RocketPropulsion must be instructed to begin applying or stopping force via Fire() or Abort() respectively.
You can detect when the assembly reaches its target using the ReachedTarget event which fires once the assembly is within the TargetRadius of the Target part.
Inherits from: BodyMover
Memory category: Instances
Tags: Deprecated
Deprecated: This object is deprecated and should not be used for new work. Use LineForce instead, and see the legacy conversion notes.
Properties
| Name | Type / Returns | Description |
|---|---|---|
| RocketPropulsion.CartoonFactor | float | Determines the tendency of the assembly to face the Target. |
| RocketPropulsion.MaxSpeed | float | Determines the maximum speed at which the assembly will move toward the Target. |
| RocketPropulsion.MaxThrust | float | Determines the maximum amount of thrust that will be exerted to move the assembly. |
| RocketPropulsion.MaxTorque | Vector3 | Determines the maximum amount of torque that may be exerted to rotate the assembly towards the Target. |
| RocketPropulsion.Target | BasePart | Determines the object towards which the assembly should follow/face. |
| RocketPropulsion.TargetOffset | Vector3 | Determines the world offset from the Target toward which the force/torque is exerted. |
| RocketPropulsion.TargetRadius | float | Determines the maximum distance from the Target at which the assembly must be in order for ReachedTarget to be fired. |
| RocketPropulsion.ThrustD | float | Determines the dampening applied to the assembly in order to prevent it from overshooting the Target. |
| RocketPropulsion.ThrustP | float | Determines how aggressive of a force is applied in reaching the Target. |
| RocketPropulsion.TurnD | float | Determines the amount of dampening that to use in reaching the Target. |
| RocketPropulsion.TurnP | float | Determines how aggressive of a torque is applied in facing the Target. |
Inherited from Instance
| Name | Type / Returns | Description |
|---|---|---|
| Instance.Archivable | boolean | Determines if an Instance and its descendants can be cloned using Instance:Clone(), and can be saved/published. |
| Instance.archivable | boolean | |
| Instance.Capabilities | SecurityCapabilities | The set of capabilities allowed to be used for scripts inside this container. |
| Instance.IsInSandbox | boolean | Indicates whether the instance is inside a sandboxed container. |
| Instance.Name | string | A non-unique identifier of the Instance. |
| Instance.Parent | Instance | Determines the hierarchical parent of the Instance. |
| Instance.PredictionMode | PredictionMode | Reflects the client-side prediction mode applied to the instance under server-authoritative physics. |
| Instance.RobloxLocked | boolean | A deprecated property that used to protect CoreGui objects. |
| Instance.Sandboxed | boolean | When enabled, the instance can only access abilities in its Capabilities list. |
| Instance.UniqueId | UniqueId | A unique identifier for the instance. |
Inherited from Object
| Name | Type / Returns | Description |
|---|---|---|
| Object.ClassName | string | A read-only string representing the class this Object belongs to. |
| Object.className | string |
RocketPropulsion.CartoonFactor
This property determines the tendency of the assembly to face the Target. By default, this property is set to 0.7. If set to 0, the assembly will make no effort to face the target.
| Field | Value |
|---|---|
| type | float |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Goals |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
RocketPropulsion.MaxSpeed
This property determines the upper limit of the velocity at which the assembly will move toward the Target.
| Field | Value |
|---|---|
| type | float |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Thrust |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
RocketPropulsion.MaxThrust
This property determines the upper limit of the thrust that may be exerted to move the assembly. Assemblies that have high mass will require more thrust in order to remain airborne and thus track the Target.
| Field | Value |
|---|---|
| type | float |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Thrust |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
RocketPropulsion.MaxTorque
This property determines the upper limit on the amount of torque that may be exerted in order to rotate the assembly towards the Target. It functions similarly to BodyGyro.MaxTorque.
| Field | Value |
|---|---|
| type | Vector3 |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Turn |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
RocketPropulsion.Target
This property determines the object towards which the RocketPropulsion will exert force/torque. If set to nil, the TargetOffset will be used instead.
| Field | Value |
|---|---|
| type | BasePart |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Goals |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
RocketPropulsion.TargetOffset
This property determines the world offset from the Target. It is especially useful when Target is set to nil, since this property then acts as the target position.
| Field | Value |
|---|---|
| type | Vector3 |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Goals |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
RocketPropulsion.TargetRadius
This property determines the maximum distance from the Target at which the assembly must be in order for ReachedTarget to be fired. It does not affect the exerted forces in any way.
| Field | Value |
|---|---|
| type | float |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Goals |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
RocketPropulsion.ThrustD
This property is used to dampen the velocity of the assembly in order to prevent it from overshooting the Target and causing a "rubber‑banding" effect. It behaves similarly to BodyPosition.D.
| Field | Value |
|---|---|
| type | float |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Thrust |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
RocketPropulsion.ThrustP
This property determines how much power is used while applying force in order to reach the Target position. The higher this value, the more power will be used and the faster it will be used. This property works similarly to BodyPosition.P.
| Field | Value |
|---|---|
| type | float |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Thrust |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
RocketPropulsion.TurnD
This property specifies how much dampening will be applied to the torque used to face the Target. When the assembly approaches the goal orientation, it needs to decelerate, otherwise it will rotate past the goal and have to stop and re-accelerate back toward the goal. This often creates an undesirable "rubber‑banding" effect, avoided by applying dampening. The higher this value is set, the greater the dampening curve becomes, or the slower the part will approach the goal orientation.
| Field | Value |
|---|---|
| type | float |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Turn |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
RocketPropulsion.TurnP
This property determines how much power is used while applying torque in order to face the Target. The higher this value, the more power will be used and the faster it will be used.
| Field | Value |
|---|---|
| type | float |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Turn |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
Methods
| Name | Type / Returns | Description |
|---|---|---|
| RocketPropulsion:Abort | () | Causes the assembly to stop moving toward its Target. |
| RocketPropulsion:Fire | () | Causes the assembly to start moving toward its Target. |
| RocketPropulsion:fire | () |
Inherited from Instance
| Name | Type / Returns | Description |
|---|---|---|
| Instance:AddTag | () | Applies a tag to the instance. |
| Instance:children | Instances | Returns an array of the object's children. |
| Instance:ClearAllChildren | () | This method destroys all of an instance's children. |
| Instance:Clone | Instance | Create a copy of an instance and all its descendants, ignoring instances that are not Archivable. |
| Instance:clone | Instance | |
| Instance:Destroy | () | Sets the Instance.Parent property to nil, locks the Instance.Parent property, disconnects all connections, and calls Destroy() on all children. |
| Instance:destroy | () | |
| Instance:FindFirstAncestor | Instance? | Returns the first ancestor of the Instance whose Instance.Name is equal to the given name. |
| Instance:FindFirstAncestorOfClass | Instance? | Returns the first ancestor of the Instance whose Object.ClassName is equal to the given className. |
| Instance:FindFirstAncestorWhichIsA | Instance? | Returns the first ancestor of the Instance for whom Object:IsA() returns true for the given className. |
| Instance:FindFirstChild | Instance? | Returns the first child of the Instance found with the given name. |
| Instance:findFirstChild | Instance | |
| Instance:FindFirstChildOfClass | Instance? | Returns the first child of the Instance whose ClassName is equal to the given class name. |
| Instance:FindFirstChildWhichIsA | Instance? | Returns the first child of the Instance for whom Object:IsA() returns true for the given className. |
| Instance:FindFirstDescendant | Instance? | Returns the first descendant found with the given Instance.Name. |
| Instance:GetActor | Actor? | Returns the Actor associated with the Instance, if any. |
| Instance:GetAttribute | Variant | Returns the value which has been assigned to the given attribute name. |
| Instance:GetAttributeChangedSignal | RBXScriptSignal | Returns an event that fires when the given attribute changes. |
| Instance:GetAttributes | Dictionary | Returns a dictionary of the instance's attributes. |
| Instance:GetChildren | Instances | Returns an array containing all of the instance's children. |
| Instance:getChildren | Instances | |
| Instance:GetDebugId | string | Returns a coded string of the debug ID used internally by Roblox. |
| Instance:GetDescendants | Instances | Returns an array containing all of the descendants of the instance. |
| Instance:GetFullName | string | Returns a string describing the instance's ancestry. |
| Instance:GetStyled | Variant | Returns the styled or explicitly modified value of the specified property, or else the default property value if it hasn't been styled/modified. |
| Instance:GetStyledPropertyChangedSignal | RBXScriptSignal | Returns an event that fires when the given style property changes on the instance. |
| Instance:GetTags | Array | Gets an array of all tags applied to the instance. |
| Instance:HasTag | boolean | Check whether the instance has a given tag. |
| Instance:IsAncestorOf | boolean | Returns true if an Instance is an ancestor of the given descendant. |
| Instance:IsDescendantOf | boolean | Returns true if an Instance is a descendant of the given ancestor. |
| Instance:isDescendantOf | boolean | |
| Instance:IsPropertyModified | boolean | Returns true if the value stored in the specified property is not equal to the code-instantiated default. |
| Instance:QueryDescendants | Instances | Returns an array containing all descendants of the instance that match the selector string. |
| Instance:Remove | () | Sets the object's Parent to nil, and does the same for all its descendants. |
| Instance:remove | () | |
| Instance:RemoveTag | () | Removes a tag from the instance. |
| Instance:ResetPropertyToDefault | () | Resets a property to its default value. |
| Instance:SetAttribute | () | Sets the attribute with the given name to the given value. |
| Instance:WaitForChild | Instance | Returns the child of the Instance with the given name. If the child does not exist, it will yield the current thread until it does. |
Inherited from Object
| Name | Type / Returns | Description |
|---|---|---|
| Object:GetPropertyChangedSignal | RBXScriptSignal | Get an event that fires when a given property of the object changes. |
| Object:IsA | boolean | Returns true if an object's class matches or inherits from a given class. |
| Object:isA | boolean |
RocketPropulsion:Abort
Causes the assembly to stop moving toward its Target.
Returns
| Type | Description |
|---|---|
| () |
| Field | Value |
|---|---|
| security | None |
| thread safety | Unsafe |
| capabilities | ["Physics"] |
RocketPropulsion:Fire
Causes the assembly to start moving toward its Target.
Returns
| Type | Description |
|---|---|
| () |
| Field | Value |
|---|---|
| security | None |
| thread safety | Unsafe |
| capabilities | ["Physics"] |
RocketPropulsion:fire
Deprecated. This function is a deprecated variant of RocketPropulsion:Fire() which should be used instead.
Returns
| Type | Description |
|---|---|
| () |
| Field | Value |
|---|---|
| tags | ["Deprecated"] |
| security | None |
| thread safety | Unsafe |
| capabilities | ["Physics"] |
Events
| Name | Type / Returns | Description |
|---|---|---|
| RocketPropulsion.ReachedTarget | Fires when the assembly comes within TargetRadius of the Target. |
Inherited from Instance
| Name | Type / Returns | Description |
|---|---|---|
| Instance.AncestryChanged | Fires when the Instance.Parent property of this object or one of its ancestors is changed. | |
| Instance.AttributeChanged | Fires whenever an attribute is changed on the Instance. | |
| Instance.ChildAdded | Fires after an object is parented to this Instance. | |
| Instance.childAdded | ||
| Instance.ChildRemoved | Fires after a child is removed from this Instance. | |
| Instance.DescendantAdded | Fires after a descendant is added to the Instance. | |
| Instance.DescendantRemoving | Fires immediately before a descendant of the Instance is removed. | |
| Instance.Destroying | Fires immediately before (or is deferred until after) the instance is destroyed via Instance:Destroy(). | |
| Instance.StyledPropertiesChanged | Fires whenever any style property is changed on the instance, including when a property is set to nil. |
Inherited from Object
| Name | Type / Returns | Description |
|---|---|---|
| Object.Changed | Fires immediately after a property of the object changes, with some limitations. |
RocketPropulsion.ReachedTarget
Fires when the assembly comes within TargetRadius of the Target.
| Field | Value |
|---|---|
| security | None |
| capabilities | ["Physics"] |