SITL: quadplane updates

libraries/SITL/SIM_Aircraft.h

@@ -84,6 +84,16 @@ public:
     // get frame rate of model in Hz
     float get_rate_hz(void) const { return rate_hz; }
 
+    // get number of motors for model
+    uint16_t get_num_motors() const {
+        return num_motors;
+    }
+
+    // get motor offset for model
+    virtual uint16_t get_motors_offset() const {
+        return 0;
+    }
+
     const Vector3f &get_gyro(void) const {
         return gyro;
     }

libraries/SITL/SIM_Multicopter.h

@@ -34,6 +34,11 @@ public:
     /* update model by one time step */
     void update(const struct sitl_input &input) override;
 
+    // get motor offset for model
+    virtual uint16_t get_motors_offset() const override {
+        return frame->motor_offset;
+    }
+
     /* static object creator */
     static Aircraft *create(const char *frame_str) {
         return new MultiCopter(frame_str);

libraries/SITL/SIM_QuadPlane.h

@@ -38,6 +38,13 @@ public:
     static Aircraft *create(const char *frame_str) {
         return new QuadPlane(frame_str);
     }
+
+    // get motor offset for model
+    virtual uint16_t get_motors_offset() const override {
+        return frame->motor_offset;
+    }
+
+
 private:
     Frame *frame;
 };