Actually, scrap that, allow 0-speed wind

core/src/main/java/info/openrocket/core/models/wind/MultiLevelWindModel.java

@@ -146,7 +146,7 @@ public class MultiLevelWindModel implements WindModel {
 
 		public WindLevel(double altitude, double speed, double direction) {
 			this.altitude = altitude;
-			this.speed = Math.max(speed, 0.1);
+			this.speed = Math.max(speed, 0);
 			this.direction = direction;
 		}
 

core/src/main/java/info/openrocket/core/models/wind/PinkNoiseWindModel.java

@@ -78,7 +78,7 @@ public class PinkNoiseWindModel implements WindModel {
 	 * @param average the average wind speed to set
 	 */
 	public void setAverage(double average) {
-		average = Math.max(average, 0.1);
+		average = Math.max(average, 0);
 		if (average == this.average) {
 			return;
 		}

core/src/main/java/info/openrocket/core/util/Quaternion.java

@@ -242,7 +242,7 @@ public class Quaternion {
 		// return = (a,b,c,d) * (this)^-1 = (a,b,c,d) * (w,-x,-y,-z)
 
 		// Assert that the w-value is zero
-		assert (Math.abs(a * w + b * x + c * y + d * z) < coord.max() * MathUtil.EPSILON)
+		assert (Math.abs(a * w + b * x + c * y + d * z) <= coord.max() * MathUtil.EPSILON)
 				: ("Should be zero: " + (a * w + b * x + c * y + d * z) + " in " + this + " c=" + coord);
 
 		return new Coordinate(

core/src/test/java/info/openrocket/core/simulation/FlightEventsTest.java

@@ -69,6 +69,7 @@ public class FlightEventsTest extends BaseTestCase {
 		final Simulation sim = new Simulation(rocket);
 		sim.getOptions().setISAAtmosphere(true);
 		sim.getOptions().setTimeStep(0.05);
+		sim.getOptions ().getPinkNoiseWindModel().setAverage(0.1);
 		rocket.getSelectedConfiguration().setAllStages();
 		FlightConfigurationId fcid = rocket.getSelectedConfiguration().getFlightConfigurationID();
 		sim.setFlightConfigurationId(fcid);