diff --git a/core/src/net/sf/openrocket/util/TestRockets.java b/core/src/net/sf/openrocket/util/TestRockets.java
index a6e5fd7ee..f0012a0d5 100644
--- a/core/src/net/sf/openrocket/util/TestRockets.java
+++ b/core/src/net/sf/openrocket/util/TestRockets.java
@@ -1049,7 +1049,7 @@ public class TestRockets {
 					boosterCone.setThickness(0.002);
 					//payloadFairingNoseCone.setLength(0.118);
 					//payloadFairingNoseCone.setAftRadius(0.052);
-					boosterCone.setAftShoulderRadius( 0.051 );
+					boosterCone.setAftShoulderRadius( 0.0375 );
 					boosterCone.setAftShoulderLength( 0.02 );
 					boosterCone.setAftShoulderThickness( 0.001 );
 					boosterCone.setAftShoulderCapped( false );