diff --git a/FNPlugin/FNRadiator.cs b/FNPlugin/FNRadiator.cs
index 9ab52031..53d09009 100644
--- a/FNPlugin/FNRadiator.cs
+++ b/FNPlugin/FNRadiator.cs
@@ -47,6 +47,11 @@ class FNRadiator : FNResourceSuppliableModule	{
 		[KSPField(isPersistant = false, guiActive = true, guiName = "Upgrade")]
 		public string upgradeCostStr;
 
+        [KSPField(isPersistant = false)]
+        public float maxQ = 150.0f;
+		[KSPField(isPersistant = false, guiActive = true, guiName = "Max. Dyn. Press.")]
+		public string maxQStr;
+
 		//public static double stefan_const = 5.6704e-8;
         protected static float rad_const_h = 1000;
         protected static double alpha = 0.001998001998001998001998001998;
@@ -136,6 +141,17 @@ public void DeployRadiator() {
 			if (!isDeployable) {
 				return;
 			}
+			if (vessel.altitude <= PluginHelper.getMaxAtmosphericAltitude(vessel.mainBody)) {
+				float pressure = (float) FlightGlobals.getStaticPressure (vessel.transform.position);
+				float dynamic_pressure = (float) (0.5*pressure*1.2041*vessel.srf_velocity.sqrMagnitude);
+				if (dynamic_pressure >= maxQ) {
+					ScreenMessages.PostScreenMessage(
+							"Radiator deployment aborted: Dynamic pressure exceeds part tolerance.",
+							5.0f,
+							ScreenMessageStyle.UPPER_CENTER);
+					return;
+				}
+			}
 			anim [animName].speed = 1f;
 			anim [animName].normalizedTime = 0f;
 			anim.Blend (animName, 2f);
@@ -246,6 +262,7 @@ public override void OnStart(PartModule.StartState state) {
 
 
 			radiatorTempStr = radiatorTemp + "K";
+			maxQStr = maxQ + " Pa";
             this.part.force_activate();
 		}
 
@@ -283,7 +300,7 @@ public override void OnFixedUpdate() {
 			float conv_power_dissip = 0;
 			if (vessel.altitude <= PluginHelper.getMaxAtmosphericAltitude(vessel.mainBody)) {
 				float pressure = (float) FlightGlobals.getStaticPressure (vessel.transform.position);
-				float dynamic_pressure = (float) (0.5*pressure*1.2041*vessel.srf_velocity.sqrMagnitude/101325.0);
+				float dynamic_pressure = (float) (0.5*pressure*1.2041*vessel.srf_velocity.sqrMagnitude);
 				pressure += dynamic_pressure;
 				float low_temp = FlightGlobals.getExternalTemperature (vessel.transform.position);
 
@@ -294,7 +311,7 @@ public override void OnFixedUpdate() {
 				}
 				convectedThermalPower = consumeFNResource (conv_power_dissip, FNResourceManager.FNRESOURCE_WASTEHEAT) / TimeWarp.fixedDeltaTime;
 
-				if (radiatorIsEnabled && dynamic_pressure > 1.4854428818159388107574636072046e-3 && isDeployable) {
+				if (radiatorIsEnabled && dynamic_pressure > maxQ && isDeployable) {
 					part.deactivate();
 
 					//part.breakingForce = 1;
@@ -404,7 +421,11 @@ public override string GetInfo() {
             float thermal_power_dissip5 = (float)(GameConstants.stefan_const * radiatorArea * Math.Pow(1800, 4) / 1e6);
             float thermal_power_dissip6 = (float)(GameConstants.stefan_const * radiatorArea * Math.Pow(2400, 4) / 1e6);
             float thermal_power_dissip7 = (float)(GameConstants.stefan_const * radiatorArea * Math.Pow(3000, 4) / 1e6);
-            return String.Format("Maximum Waste Heat Radiated\n Base: {0} MW\n Upgraded: {1} MW\n-----\nRadiator Performance at:\n600K: {2} MW\n1200K: {3} MW\n1800K: {4} MW\n2400K: {5} MW\n3000K: {6} MW\n", thermal_power_dissip, thermal_power_dissip2, thermal_power_dissip3, thermal_power_dissip4, thermal_power_dissip5, thermal_power_dissip6, thermal_power_dissip7);
+            string infoStr = String.Format("Maximum Waste Heat Radiated\n Base: {0} MW\n Upgraded: {1} MW\n-----\nRadiator Performance at:\n600K: {2} MW\n1200K: {3} MW\n1800K: {4} MW\n2400K: {5} MW\n3000K: {6} MW\n", thermal_power_dissip, thermal_power_dissip2, thermal_power_dissip3, thermal_power_dissip4, thermal_power_dissip5, thermal_power_dissip6, thermal_power_dissip7);
+			if (isDeployable) {
+				infoStr += String.Format("-----\nBreaks if dynamic pressure exceeds {0} Pa", maxQ);
+			}
+			return infoStr;
 		}
 
         public override int getPowerPriority() {
diff --git a/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator0.cfg b/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator0.cfg
index e56bfb67..d71e000a 100644
--- a/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator0.cfg
+++ b/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator0.cfg
@@ -45,6 +45,7 @@ MODULE
 	upgradedName = Graphene Radiator
 	upgradedRadiatorTemp = 3500
 	upgradeTechReq = experimentalElectrics
+	maxQ = 150
 }
 
 RESOURCE
diff --git a/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator1.cfg b/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator1.cfg
index 84d4cc8e..83a1547d 100644
--- a/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator1.cfg
+++ b/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator1.cfg
@@ -47,6 +47,7 @@ MODULE
 	upgradedName = Graphene Radiator
 	upgradedRadiatorTemp = 3500
 	upgradeTechReq = experimentalElectrics
+	maxQ = 150
 }
 
 RESOURCE
diff --git a/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator2.cfg b/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator2.cfg
index 15c2423e..e9de7adb 100644
--- a/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator2.cfg
+++ b/GameData/WarpPlugin/Parts/Electrical/HeatRadiator/radiator2.cfg
@@ -47,6 +47,7 @@ MODULE
 	upgradedName = Graphene Radiator
 	upgradedRadiatorTemp = 3500
 	upgradeTechReq = experimentalElectrics
+	maxQ = 150
 }
 
 RESOURCE