*

Unity/Assets/Scripts/PropellerForce.cs

@@ -0,0 +1,58 @@
+using UnityEngine;
+using System.Collections;
+
+public class PropellerForce : MonoBehaviour {
+	public Motor motor;
+	public float maxForce = 20;
+	public float maxTorque = 20;
+	private Vector3 forceVector;
+	private Rigidbody rb;
+	private Vector3 torque;
+
+	private Vector3 torqueForce;
+	private Vector3 torqueOrtho;
+
+	// Use this for initialization
+	void Start () {
+		rb = gameObject.GetComponentInParent<Rigidbody> ();
+	}
+
+	void FixedUpdate(){
+		if (rb == null) {
+			return;
+		}
+		float motorSpeedNormalized = (motor.speed / motor.maxRpm);
+
+		float force = Mathf.Abs(motorSpeedNormalized * maxForce);
+		forceVector = motor.transform.up * force;
+		rb.AddForceAtPosition(forceVector, motor.transform.position);
+
+		float torqueMagnitude = maxTorque * motorSpeedNormalized;
+		torque = -torqueMagnitude * motor.transform.up;
+
+		rb.AddTorqueAtPosition (torque, motor.transform.position, ref torqueForce, ref torqueOrtho);
+	}
+
+	void OnDrawGizmos(){
+		//return;
+		Gizmos.DrawLine (motor.transform.position, motor.transform.position + forceVector);
+		Gizmos.color = Color.green;
+
+		var pa = motor.transform.position;
+		var pb = motor.transform.position + torqueOrtho;
+		var pc = motor.transform.position + torqueOrtho + torqueForce;
+		var pd = motor.transform.position - torqueOrtho;
+		var pe = motor.transform.position - torqueOrtho - torqueForce;
+
+		Gizmos.DrawLine (pa, pb);
+		Gizmos.DrawLine (pb, pc);
+
+		Gizmos.DrawLine (pa, pd);
+		Gizmos.DrawLine (pd, pe);
+	}
+
+	// Update is called once per frame
+	void Update () {
+	
+	}
+}