diff --git a/core/src/main/java/info/openrocket/core/aerodynamics/AerodynamicForces.java b/core/src/main/java/info/openrocket/core/aerodynamics/AerodynamicForces.java
index 97fd05c04..2aff94005 100644
--- a/core/src/main/java/info/openrocket/core/aerodynamics/AerodynamicForces.java
+++ b/core/src/main/java/info/openrocket/core/aerodynamics/AerodynamicForces.java
@@ -77,7 +77,11 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setAxisymmetric(final boolean isSym) {
+		if (this.axisymmetric == isSym)
+			return;
+		
 		this.axisymmetric = isSym;
+		modID = new ModID();
 	}
 
 	/**
@@ -87,6 +91,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	 * @param component The rocket component
 	 */
 	public void setComponent(RocketComponent component) {
+		if (this.component == component)
+			return;
+		
 		this.component = component;
 		modID = new ModID();
 	}
@@ -100,6 +107,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setCP(Coordinate cp) {
+		if ((this.cp != null) && this.cp.equals(cp))
+			return;
+		
 		this.cp = cp;
 		modID = new ModID();
 	}
@@ -109,6 +119,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setCNa(double cNa) {
+		if (CNa == cNa)
+			return;
+		
 		CNa = cNa;
 		modID = new ModID();
 	}
@@ -118,6 +131,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setCN(double cN) {
+		if (CN == cN)
+			return;
+		
 		CN = cN;
 		modID = new ModID();
 	}
@@ -127,6 +143,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setCm(double cm) {
+		if (Cm == cm)
+			return;
+		
 		Cm = cm;
 		modID = new ModID();
 	}
@@ -136,6 +155,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setCside(double cside) {
+		if (Cside == cside)
+			return;
+		
 		Cside = cside;
 		modID = new ModID();
 	}
@@ -145,6 +167,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setCyaw(double cyaw) {
+		if (Cyaw == cyaw)
+			return;
+		
 		Cyaw = cyaw;
 		modID = new ModID();
 	}
@@ -154,6 +179,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setCroll(double croll) {
+		if (Croll == croll)
+			return;
+		
 		Croll = croll;
 		modID = new ModID();
 	}
@@ -163,6 +191,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setCrollDamp(double crollDamp) {
+		if (CrollDamp == crollDamp)
+			return;
+		
 		CrollDamp = crollDamp;
 		modID = new ModID();
 	}
@@ -172,6 +203,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setCrollForce(double crollForce) {
+		if (CrollForce == crollForce)
+			return;
+		
 		CrollForce = crollForce;
 		modID = new ModID();
 	}
@@ -181,6 +215,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setCDaxial(double cdaxial) {
+		if (CDaxial == cdaxial)
+			return;
+		
 		CDaxial = cdaxial;
 		modID= new ModID();
 	}
@@ -190,6 +227,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setCD(double cD) {
+		if (CD == cD)
+			return;
+		
 		CD = cD;
 		modID = new ModID();
 	}
@@ -206,6 +246,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setPressureCD(double pressureCD) {
+		if (this.pressureCD == pressureCD)
+			return;
+		
 		this.pressureCD = pressureCD;
 		modID = new ModID();
 	}
@@ -221,6 +264,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setBaseCD(double baseCD) {
+		if (this.baseCD == baseCD)
+			return;
+		
 		this.baseCD = baseCD;
 		modID = new ModID();
 	}
@@ -236,6 +282,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setFrictionCD(double frictionCD) {
+		if (this.frictionCD == frictionCD)
+			return;
+		
 		this.frictionCD = frictionCD;
 		modID = new ModID();
 	}
@@ -251,6 +300,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setOverrideCD(double overrideCD) {
+		if (this.overrideCD == overrideCD)
+			return;
+		
 		this.overrideCD = overrideCD;
 		modID = new ModID();
 	}
@@ -266,6 +318,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setPitchDampingMoment(double pitchDampingMoment) {
+		if (this.pitchDampingMoment == pitchDampingMoment)
+			return;
+		
 		this.pitchDampingMoment = pitchDampingMoment;
 		modID = new ModID();
 	}
@@ -275,6 +330,9 @@ public class AerodynamicForces implements Cloneable, Monitorable {
 	}
 
 	public void setYawDampingMoment(double yawDampingMoment) {
+		if (this.yawDampingMoment == yawDampingMoment)
+			return;
+		   
 		this.yawDampingMoment = yawDampingMoment;
 		modID = new ModID();
 	}
diff --git a/core/src/main/java/info/openrocket/core/aerodynamics/FlightConditions.java b/core/src/main/java/info/openrocket/core/aerodynamics/FlightConditions.java
index f71fecb12..33a5e3a30 100644
--- a/core/src/main/java/info/openrocket/core/aerodynamics/FlightConditions.java
+++ b/core/src/main/java/info/openrocket/core/aerodynamics/FlightConditions.java
@@ -82,7 +82,6 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
 	public FlightConditions(FlightConfiguration config) {
 		if (config != null)
 			setRefLength(config.getReferenceLength());
-		this.modID = new ModID();
 	}
 
 	/**
@@ -99,9 +98,12 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
 	 * fires change event
 	 */
 	public void setRefLength(double length) {
+		if (refLength == length)
+			return;
+		
 		refLength = length;
-
 		refArea = Math.PI * MathUtil.pow2(length / 2);
+
 		fireChangeEvent();
 	}
 
@@ -117,8 +119,12 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
 	 * fires change event
 	 */
 	public void setRefArea(double area) {
+		if (refArea == area)
+			return;
+		
 		refArea = area;
 		refLength = MathUtil.safeSqrt(area / Math.PI) * 2;
+
 		fireChangeEvent();
 	}
 
@@ -149,6 +155,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
 			this.sinAOA = Math.sin(aoa);
 			this.sincAOA = sinAOA / aoa;
 		}
+
 		fireChangeEvent();
 	}
 
@@ -178,6 +185,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
 		} else {
 			this.sincAOA = sinAOA / aoa;
 		}
+
 		fireChangeEvent();
 	}
 
@@ -212,6 +220,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
 		if (MathUtil.equals(this.theta, theta))
 			return;
 		this.theta = theta;
+
 		fireChangeEvent();
 	}
 
@@ -238,6 +247,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
 			this.beta = MathUtil.safeSqrt(1 - mach * mach);
 		else
 			this.beta = MathUtil.safeSqrt(mach * mach - 1);
+
 		fireChangeEvent();
 	}
 
@@ -294,6 +304,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
 			return;
 
 		this.rollRate = rate;
+		
 		fireChangeEvent();
 	}
 
@@ -369,7 +380,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
 	public void setAtmosphericConditions(AtmosphericConditions cond) {
 		if (atmosphericConditions.equals(cond))
 			return;
-		modID = new ModID();
+
 		atmosphericConditions = cond;
 		fireChangeEvent();
 	}
@@ -456,6 +467,8 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
 	 * wake up call to listeners
 	 */
 	protected void fireChangeEvent() {
+		modID = new ModID();
+		
 		// Copy the list before iterating to prevent concurrent modification exceptions.
 		EventListener[] listeners = listenerList.toArray(new EventListener[0]);
 		for (EventListener l : listeners) {