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code/entities/ThrusterEntity.cs

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+using Sandbox;
+
+[Library( "ent_thruster" )]
+public partial class ThrusterEntity : Prop, IUse
+{
+	public float Force = 1000.0f;
+	public bool Massless = false;
+	public PhysicsBody TargetBody;
+
+	[Net]
+	public bool Enabled { get; set; } = true;
+
+	[Event.Physics.PostStep]
+	public virtual void OnPostPhysicsStep()
+	{
+		if ( IsServer && Enabled )
+		{
+			if ( TargetBody.IsValid() )
+			{
+				TargetBody.ApplyForceAt( Position, Rotation.Down * (Massless ? Force * TargetBody.Mass : Force) );
+			}
+			else if ( PhysicsBody.IsValid() )
+			{
+				PhysicsBody.ApplyForce( Rotation.Down * (Massless ? Force * PhysicsBody.Mass : Force) );
+			}
+		}
+	}
+
+	public bool IsUsable( Entity user )
+	{
+		return true;
+	}
+
+	public bool OnUse( Entity user )
+	{
+		Enabled = !Enabled;
+
+		return false;
+	}
+
+	protected override void OnDestroy()
+	{
+		base.OnDestroy();
+
+		if ( IsClient )
+		{
+			KillEffects();
+		}
+	}
+}