diff --git a/core/resources/l10n/messages.properties b/core/resources/l10n/messages.properties
index 87a2d18d9..4a9a4e1e2 100644
--- a/core/resources/l10n/messages.properties
+++ b/core/resources/l10n/messages.properties
@@ -1849,6 +1849,7 @@ PlotConfiguration.Groundtrack = Ground track
 Warning.LargeAOA.str1 = Large angle of attack encountered.
 Warning.LargeAOA.str2 = Large angle of attack encountered (
 Warning.DISCONTINUITY = Discontinuity in rocket body diameter
+Warning.OPEN_AIRFRAME_FORWARD = Forward end of airframe is open (radius is > 0)
 Warning.THICK_FIN = Thick fins may not simulate accurately.
 Warning.JAGGED_EDGED_FIN = Jagged-edged fin predictions may be inaccurate.
 Warning.LISTENERS_AFFECTED = Listeners modified the flight simulation
diff --git a/core/src/net/sf/openrocket/aerodynamics/BarrowmanCalculator.java b/core/src/net/sf/openrocket/aerodynamics/BarrowmanCalculator.java
index 4f22f93bb..96ae2c947 100644
--- a/core/src/net/sf/openrocket/aerodynamics/BarrowmanCalculator.java
+++ b/core/src/net/sf/openrocket/aerodynamics/BarrowmanCalculator.java
@@ -44,7 +44,6 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
 	private double cacheDiameter = -1;
 	private double cacheLength = -1;
 
-	
 	public BarrowmanCalculator() {
 		
 	}
@@ -299,14 +298,16 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
 				}
 				
 				SymmetricComponent sym = (SymmetricComponent) comp;
+				prevComp = sym.getPreviousSymmetricComponent();
 				if( null == prevComp){
-					prevComp = sym;
-					continue;
-				}
-				
-				// Check for radius discontinuity
-				if ( !MathUtil.equals(sym.getForeRadius(), prevComp.getAftRadius())) {
-					warnings.add( Warning.DIAMETER_DISCONTINUITY, sym + ", " + prevComp);					
+					if (sym.getForeRadius() - sym.getThickness() > MathUtil.EPSILON) {
+						warnings.add(Warning.OPEN_AIRFRAME_FORWARD, sym.toString());
+					}
+				} else {
+					// Check for radius discontinuity
+					if ( !MathUtil.equals(sym.getForeRadius(), prevComp.getAftRadius())) {
+						warnings.add( Warning.DIAMETER_DISCONTINUITY, sym + ", " + prevComp);					
+					}
 				}
 				
 				// double x = component.toAbsolute(Coordinate.NUL)[0].x;
@@ -318,7 +319,6 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
                 //}
 				//componentX = component.toAbsolute(new Coordinate(component.getLengthAerodynamic()))[0].x;
 						
-				prevComp = sym;
 			}else if( comp instanceof ComponentAssembly ){
 				checkGeometry(configuration, comp, warnings);
 			}
diff --git a/core/src/net/sf/openrocket/aerodynamics/Warning.java b/core/src/net/sf/openrocket/aerodynamics/Warning.java
index c746650ea..b3c31fecc 100644
--- a/core/src/net/sf/openrocket/aerodynamics/Warning.java
+++ b/core/src/net/sf/openrocket/aerodynamics/Warning.java
@@ -358,6 +358,9 @@ public abstract class Warning {
 	/** A <code>Warning</code> that the body diameter is discontinuous. */
 	////Discontinuity in rocket body diameter.
 	public static final Warning DIAMETER_DISCONTINUITY = new Other(trans.get("Warning.DISCONTINUITY"));
+
+	/** A <code>Warning</code> that a ComponentAssembly has an open forward end */	
+	public static final Warning OPEN_AIRFRAME_FORWARD = new Other(trans.get("Warning.OPEN_AIRFRAME_FORWARD"));
 	
 	/** A <code>Warning</code> that the fins are thick compared to the rocket body. */
 	////Thick fins may not be modeled accurately.