diff --git a/Blimp/AP_Arming.cpp b/Blimp/AP_Arming.cpp
index c72d250cc2..ea36c2c1f0 100644
--- a/Blimp/AP_Arming.cpp
+++ b/Blimp/AP_Arming.cpp
@@ -107,7 +107,7 @@ bool AP_Arming_Blimp::parameter_checks(bool display_failure)
         // failsafe parameter checks
         if (blimp.g.failsafe_throttle) {
             // check throttle min is above throttle failsafe trigger and that the trigger is above ppm encoder's loss-of-signal value of 900
-            if (blimp.channel_down->get_radio_min() <= blimp.g.failsafe_throttle_value+10 || blimp.g.failsafe_throttle_value < 910) {
+            if (blimp.channel_up->get_radio_min() <= blimp.g.failsafe_throttle_value+10 || blimp.g.failsafe_throttle_value < 910) {
                 check_failed(ARMING_CHECK_PARAMETERS, display_failure, "Check FS_THR_VALUE");
                 return false;
             }
diff --git a/Blimp/Blimp.h b/Blimp/Blimp.h
index 763ef015a8..d106c85f68 100644
--- a/Blimp/Blimp.h
+++ b/Blimp/Blimp.h
@@ -111,7 +111,7 @@ private:
     // primary input control channels
     RC_Channel *channel_right;
     RC_Channel *channel_front;
-    RC_Channel *channel_down;
+    RC_Channel *channel_up;
     RC_Channel *channel_yaw;
 
     AP_Logger logger;
diff --git a/Blimp/RC_Channel.cpp b/Blimp/RC_Channel.cpp
index 12ef483847..7709867cf2 100644
--- a/Blimp/RC_Channel.cpp
+++ b/Blimp/RC_Channel.cpp
@@ -106,7 +106,7 @@ bool RC_Channel_Blimp::do_aux_function(const aux_func_t ch_option, const AuxSwit
     case AUX_FUNC::SAVE_TRIM:
         if ((ch_flag == AuxSwitchPos::HIGH) &&
             (blimp.control_mode <= Mode::Number::MANUAL) &&
-            (blimp.channel_down->get_control_in() == 0)) {
+            (blimp.channel_up->get_control_in() == 0)) {
             blimp.save_trim();
         }
         break;
diff --git a/Blimp/mode.cpp b/Blimp/mode.cpp
index 64a08c829a..23f1328487 100644
--- a/Blimp/mode.cpp
+++ b/Blimp/mode.cpp
@@ -19,7 +19,7 @@ Mode::Mode(void) :
     loiter(blimp.loiter),
     channel_right(blimp.channel_right),
     channel_front(blimp.channel_front),
-    channel_down(blimp.channel_down),
+    channel_up(blimp.channel_up),
     channel_yaw(blimp.channel_yaw),
     G_Dt(blimp.G_Dt)
 { };
diff --git a/Blimp/mode.h b/Blimp/mode.h
index b57c1d1152..107cc8c1a3 100644
--- a/Blimp/mode.h
+++ b/Blimp/mode.h
@@ -108,7 +108,7 @@ protected:
     Loiter *&loiter;
     RC_Channel *&channel_right;
     RC_Channel *&channel_front;
-    RC_Channel *&channel_down;
+    RC_Channel *&channel_up;
     RC_Channel *&channel_yaw;
     float &G_Dt;
 
diff --git a/Blimp/motors.cpp b/Blimp/motors.cpp
index c203477488..35ba08b90c 100644
--- a/Blimp/motors.cpp
+++ b/Blimp/motors.cpp
@@ -18,7 +18,7 @@ void Blimp::arm_motors_check()
     }
 
     // ensure throttle is down
-    if (channel_down->get_control_in() > 0) { //MIR what dow we do with this?
+    if (channel_up->get_control_in() > 0) { //MIR what dow we do with this?
         arming_counter = 0;
         return;
     }
diff --git a/Blimp/radio.cpp b/Blimp/radio.cpp
index e7640c44c2..861c057820 100644
--- a/Blimp/radio.cpp
+++ b/Blimp/radio.cpp
@@ -8,23 +8,23 @@ void Blimp::default_dead_zones()
 {
     channel_right->set_default_dead_zone(20);
     channel_front->set_default_dead_zone(20);
-    channel_down->set_default_dead_zone(30);
+    channel_up->set_default_dead_zone(30);
     channel_yaw->set_default_dead_zone(20);
     rc().channel(CH_6)->set_default_dead_zone(0);
 }
 
 void Blimp::init_rc_in()
 {
-    channel_right     = rc().channel(rcmap.roll()-1);
-    channel_front    = rc().channel(rcmap.pitch()-1);
-    channel_down = rc().channel(rcmap.throttle()-1);
-    channel_yaw      = rc().channel(rcmap.yaw()-1);
+    channel_right = rc().channel(rcmap.roll()-1);
+    channel_front = rc().channel(rcmap.pitch()-1);
+    channel_up    = rc().channel(rcmap.throttle()-1);
+    channel_yaw   = rc().channel(rcmap.yaw()-1);
 
     // set rc channel ranges
     channel_right->set_angle(RC_SCALE);
     channel_front->set_angle(RC_SCALE);
     channel_yaw->set_angle(RC_SCALE);
-    channel_down->set_angle(RC_SCALE);
+    channel_up->set_angle(RC_SCALE);
 
     // set default dead zones
     default_dead_zones();
@@ -58,14 +58,14 @@ void Blimp::read_radio()
     if (rc().read_input()) {
         ap.new_radio_frame = true;
 
-        set_throttle_and_failsafe(channel_down->get_radio_in());
-        set_throttle_zero_flag(channel_down->get_control_in());
+        set_throttle_and_failsafe(channel_up->get_radio_in());
+        set_throttle_zero_flag(channel_up->get_control_in());
 
         // RC receiver must be attached if we've just got input
         ap.rc_receiver_present = true;
 
         const float dt = (tnow_ms - last_radio_update_ms)*1.0e-3f;
-        rc_throttle_control_in_filter.apply(channel_down->get_control_in(), dt);
+        rc_throttle_control_in_filter.apply(channel_up->get_control_in(), dt);
         last_radio_update_ms = tnow_ms;
         return;
     }