diff --git a/android/AndroidManifest.xml b/android/AndroidManifest.xml
index daa4f0d62..f1c961d58 100644
--- a/android/AndroidManifest.xml
+++ b/android/AndroidManifest.xml
@@ -5,7 +5,7 @@
     android:versionName="1.0" >
 
     <uses-sdk
-        android:minSdkVersion="9"
+        android:minSdkVersion="8"
         android:targetSdkVersion="15" />
 
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
diff --git a/android/src/net/sf/openrocket/android/thrustcurve/ThrustCurveAPI.java b/android/src/net/sf/openrocket/android/thrustcurve/ThrustCurveAPI.java
index 6b74c2856..0d1a3de42 100644
--- a/android/src/net/sf/openrocket/android/thrustcurve/ThrustCurveAPI.java
+++ b/android/src/net/sf/openrocket/android/thrustcurve/ThrustCurveAPI.java
@@ -18,14 +18,14 @@ import net.sf.openrocket.motor.ThrustCurveMotorPlaceholder;
 
 public abstract class ThrustCurveAPI {
 
-	private static String url_base = "http://www.thrustcurve.org/servlets/";
+	//private static String url_base = "http://www.thrustcurve.org/servlets/";
 	
 	public static SearchResponse doSearch( SearchRequest request ) throws MalformedURLException, IOException {
 		
 		String requestString = request.toString();
 		
 		AndroidLogWrapper.d(ThrustCurveAPI.class, "doSearch: " + requestString);
-		URL url = new URL(url_base + "search");
+		URL url = new URL("http", "www.thurustcurve.org", "servlets/search");
 
         OutputStream  stream;
 
@@ -58,7 +58,7 @@ public abstract class ThrustCurveAPI {
 		String requestString = dr.toString();
 
 		AndroidLogWrapper.d(ThrustCurveAPI.class, "downloadData: " + requestString);
-		URL url = new URL(url_base + "download");
+		URL url = new URL("http", "www.thurustcurve.org", "servlets/download");
 
 		OutputStream  stream;
 
diff --git a/core/src/net/sf/openrocket/file/GeneralRocketLoader.java b/core/src/net/sf/openrocket/file/GeneralRocketLoader.java
index 775d9eddf..16f9c9acd 100644
--- a/core/src/net/sf/openrocket/file/GeneralRocketLoader.java
+++ b/core/src/net/sf/openrocket/file/GeneralRocketLoader.java
@@ -12,6 +12,7 @@ import java.util.zip.ZipInputStream;
 import net.sf.openrocket.document.OpenRocketDocument;
 import net.sf.openrocket.file.openrocket.importt.OpenRocketLoader;
 import net.sf.openrocket.file.rocksim.importt.RocksimLoader;
+import net.sf.openrocket.util.TextUtil;
 
 
 /**
@@ -26,9 +27,9 @@ public class GeneralRocketLoader extends AbstractRocketLoader {
 	private static final int READ_BYTES = 300;
 	
 	private static final byte[] GZIP_SIGNATURE = { 31, -117 }; // 0x1f, 0x8b
-	private static final byte[] ZIP_SIGNATURE = "PK".getBytes(Charset.forName("US-ASCII"));
-	private static final byte[] OPENROCKET_SIGNATURE = "<openrocket".getBytes(Charset.forName("US-ASCII"));
-	private static final byte[] ROCKSIM_SIGNATURE = "<RockSimDoc".getBytes(Charset.forName("US-ASCII"));
+	private static final byte[] ZIP_SIGNATURE = TextUtil.convertStringToBytes("PK",Charset.forName("US-ASCII"));
+	private static final byte[] OPENROCKET_SIGNATURE = TextUtil.convertStringToBytes("<openrocket",Charset.forName("US-ASCII"));
+	private static final byte[] ROCKSIM_SIGNATURE = TextUtil.convertStringToBytes("<RockSimDoc",Charset.forName("US-ASCII"));
 	
 	private final OpenRocketLoader openRocketLoader = new OpenRocketLoader();
 	
diff --git a/core/src/net/sf/openrocket/file/motor/AbstractMotorLoader.java b/core/src/net/sf/openrocket/file/motor/AbstractMotorLoader.java
index e9051f7a7..b166706f8 100644
--- a/core/src/net/sf/openrocket/file/motor/AbstractMotorLoader.java
+++ b/core/src/net/sf/openrocket/file/motor/AbstractMotorLoader.java
@@ -6,11 +6,11 @@ import java.io.InputStreamReader;
 import java.io.Reader;
 import java.nio.charset.Charset;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
 import net.sf.openrocket.motor.Motor;
+import net.sf.openrocket.util.ArrayUtils;
 import net.sf.openrocket.util.MathUtil;
 
 public abstract class AbstractMotorLoader implements MotorLoader {
@@ -136,7 +136,7 @@ public abstract class AbstractMotorLoader implements MotorLoader {
 		String[] pieces = str.split(delim);
 		if (pieces.length == 0 || !pieces[0].equals(""))
 			return pieces;
-		return Arrays.copyOfRange(pieces, 1, pieces.length);
+		return ArrayUtils.copyOfRange(pieces, 1, pieces.length);
 	}
 	
 	
diff --git a/core/src/net/sf/openrocket/file/simplesax/DelegatorHandler.java b/core/src/net/sf/openrocket/file/simplesax/DelegatorHandler.java
index d5c1f3731..169a4d707 100644
--- a/core/src/net/sf/openrocket/file/simplesax/DelegatorHandler.java
+++ b/core/src/net/sf/openrocket/file/simplesax/DelegatorHandler.java
@@ -1,11 +1,10 @@
 package net.sf.openrocket.file.simplesax;
 
-import java.util.ArrayDeque;
-import java.util.Deque;
 import java.util.HashMap;
 
 import net.sf.openrocket.aerodynamics.Warning;
 import net.sf.openrocket.aerodynamics.WarningSet;
+import net.sf.openrocket.util.SimpleStack;
 
 import org.xml.sax.Attributes;
 import org.xml.sax.SAXException;
@@ -18,9 +17,9 @@ import org.xml.sax.helpers.DefaultHandler;
 class DelegatorHandler extends DefaultHandler {
 	private final WarningSet warnings;
 	
-	private final Deque<ElementHandler> handlerStack = new ArrayDeque<ElementHandler>();
-	private final Deque<StringBuilder> elementData = new ArrayDeque<StringBuilder>();
-	private final Deque<HashMap<String, String>> elementAttributes = new ArrayDeque<HashMap<String, String>>();
+	private final SimpleStack<ElementHandler> handlerStack = new SimpleStack<ElementHandler>();
+	private final SimpleStack<StringBuilder> elementData = new SimpleStack<StringBuilder>();
+	private final SimpleStack<HashMap<String, String>> elementAttributes = new SimpleStack<HashMap<String, String>>();
 	
 	
 	// Ignore all elements as long as ignore > 0
diff --git a/core/src/net/sf/openrocket/rocketcomponent/RocketComponent.java b/core/src/net/sf/openrocket/rocketcomponent/RocketComponent.java
index b27fbbb0d..9000a5400 100644
--- a/core/src/net/sf/openrocket/rocketcomponent/RocketComponent.java
+++ b/core/src/net/sf/openrocket/rocketcomponent/RocketComponent.java
@@ -1,8 +1,6 @@
 package net.sf.openrocket.rocketcomponent;
 
-import java.util.ArrayDeque;
 import java.util.Collection;
-import java.util.Deque;
 import java.util.EventListener;
 import java.util.Iterator;
 import java.util.List;
@@ -21,6 +19,7 @@ import net.sf.openrocket.util.Invalidator;
 import net.sf.openrocket.util.LineStyle;
 import net.sf.openrocket.util.MathUtil;
 import net.sf.openrocket.util.SafetyMutex;
+import net.sf.openrocket.util.SimpleStack;
 import net.sf.openrocket.util.UniqueID;
 
 
@@ -1853,7 +1852,7 @@ public abstract class RocketComponent implements ChangeSource, Cloneable, Iterab
 	 */
 	private static class RocketComponentIterator implements Iterator<RocketComponent> {
 		// Stack holds iterators which still have some components left.
-		private final Deque<Iterator<RocketComponent>> iteratorStack = new ArrayDeque<Iterator<RocketComponent>>();
+		private final SimpleStack<Iterator<RocketComponent>> iteratorStack = new SimpleStack<Iterator<RocketComponent>>();
 
 		private final Rocket root;
 		private final int treeModID;
diff --git a/core/src/net/sf/openrocket/util/ArrayUtils.java b/core/src/net/sf/openrocket/util/ArrayUtils.java
new file mode 100644
index 000000000..4202c53ce
--- /dev/null
+++ b/core/src/net/sf/openrocket/util/ArrayUtils.java
@@ -0,0 +1,46 @@
+package net.sf.openrocket.util;
+
+import java.lang.reflect.Array;
+
+public class ArrayUtils {
+
+	/**
+	 * Implementation of java.util.Arrays.copyOfRange
+	 * 
+	 * Since Froyo does not include this function it must be implemented here.
+	 * 
+	 * @param original
+	 * @param start
+	 * @param end
+	 * @return
+	 */
+	public static <T> T[] copyOfRange( T[] original, int start, int end ) {
+		
+		if ( original == null ) {
+			throw new NullPointerException();
+		}
+		
+		if ( start < 0 || start > original.length ) {
+			throw new ArrayIndexOutOfBoundsException();
+		}
+		
+		if ( start > end ) {
+			throw new IllegalArgumentException();
+		}
+		
+		T[] result = (T[]) Array.newInstance( original.getClass().getComponentType(), end-start );
+		
+		int index = 0;
+		int stop = original.length < end ? original.length : end;
+		for ( int i = start; i < stop; i ++ ) {
+			if ( i < original.length ) {
+				result[index] = original[i];
+			}
+			index++;
+		}
+		
+		return result;
+		
+	}
+	
+}
diff --git a/core/src/net/sf/openrocket/util/SimpleStack.java b/core/src/net/sf/openrocket/util/SimpleStack.java
new file mode 100644
index 000000000..6bdd96718
--- /dev/null
+++ b/core/src/net/sf/openrocket/util/SimpleStack.java
@@ -0,0 +1,29 @@
+package net.sf.openrocket.util;
+
+import java.util.NoSuchElementException;
+/**
+ * SimpleStack implementation backed by an ArrayList.
+ * 
+ */
+public class SimpleStack<T> extends ArrayList<T> {
+
+	public void push( T value ) {
+		this.add(value);
+	}
+	
+	public T peek() {
+		if ( size() <= 0 ) {
+			return null;
+		}
+		return this.get( size() -1 );
+	}
+	
+	public T pop() {
+		if ( size() <= 0 ) {
+			throw new NoSuchElementException();
+		}
+		T value = this.remove( size() -1 );
+		return value;
+	}
+	
+}
diff --git a/core/src/net/sf/openrocket/util/TextUtil.java b/core/src/net/sf/openrocket/util/TextUtil.java
index 32dffd849..0189545e0 100644
--- a/core/src/net/sf/openrocket/util/TextUtil.java
+++ b/core/src/net/sf/openrocket/util/TextUtil.java
@@ -1,12 +1,32 @@
 package net.sf.openrocket.util;
 
+import java.nio.ByteBuffer;
+import java.nio.charset.Charset;
+
 
 public class TextUtil {
+
+	
 	private static final char[] HEX = {
 			'0', '1', '2', '3', '4', '5', '6', '7',
 			'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
 	};
-	
+
+	/**
+	 * Return the byte array for the string in the given charset.
+	 * 
+	 * This function is implemented because Froyo (Android API 8) does not support
+	 * String.getBytes(Charset)
+	 * 
+	 * @param string
+	 * @param charSet
+	 * @return
+	 */
+	public static byte[] convertStringToBytes( String string, Charset charSet ) {
+		ByteBuffer encoded = charSet.encode(string);
+		return encoded.array();
+	}
+
 	
 	/**
 	 * Return the bytes formatted as a hexadecimal string.  The length of the
diff --git a/core/test/net/sf/openrocket/util/ArrayUtilsTest.java b/core/test/net/sf/openrocket/util/ArrayUtilsTest.java
new file mode 100644
index 000000000..aefc21856
--- /dev/null
+++ b/core/test/net/sf/openrocket/util/ArrayUtilsTest.java
@@ -0,0 +1,84 @@
+package net.sf.openrocket.util;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import org.junit.Test;
+
+public class ArrayUtilsTest {
+
+	@Test(expected=NullPointerException.class)
+	public void testCopyOfRange_NullArg() {
+		ArrayUtils.copyOfRange( (Byte[]) null, 0 , 14);
+	}
+	
+	@Test(expected=ArrayIndexOutOfBoundsException.class)
+	public void testCopyOfRange_StartTooBig() {
+		Integer[] original = new Integer[5];
+		ArrayUtils.copyOfRange( original, 8 , 14);
+	}
+	
+	@Test(expected=ArrayIndexOutOfBoundsException.class)
+	public void testCopyOfRange_StartTooSmall() {
+		Integer[] original = new Integer[5];
+		ArrayUtils.copyOfRange( original, -1 , 14);
+	}
+	
+	@Test(expected=IllegalArgumentException.class)
+	public void testCopyOfRange_IllegalRange() {
+		Integer[] original = new Integer[5];
+		ArrayUtils.copyOfRange( original, 5, 0 );
+	}
+	
+	@Test
+	public void testCopyOfRange() {
+		Integer[] original = new Integer[5];
+		for ( int i =0; i < 5; i++ ) {
+			original[i] = i;
+		}
+		Integer[] copy = ArrayUtils.copyOfRange( original, 0, 0 );
+		assertEquals( 0, copy.length );
+		
+		copy = ArrayUtils.copyOfRange( original, 2, 2 );
+		assertEquals( 0, copy.length );
+		
+		copy = ArrayUtils.copyOfRange( original, 0, 2 );
+		assertEquals( 2, copy.length );
+		for( int i =0; i< 2; i++ ) {
+			assertEquals( original[i], copy[i] );
+		}
+
+		copy = ArrayUtils.copyOfRange( original, 2, 5 );
+		assertEquals( 3, copy.length );
+		for( int i =0; i< 3; i++ ) {
+			assertEquals( original[i+2], copy[i] );
+		}
+
+		copy = ArrayUtils.copyOfRange( original, 2, 15 );
+		assertEquals( 13, copy.length );
+		for( int i =0; i< 3; i++ ) {
+			assertEquals( original[i+2], copy[i] );
+		}
+		for ( int i=3; i< 13; i++ ) {
+			assertNull(copy[i]);
+		}
+
+	}
+
+	@Test
+	public void testCopyOfRange_ZeroSize() {
+		Integer[] original = new Integer[0];
+
+		Integer[] copy = ArrayUtils.copyOfRange( original, 0, 0 );
+		assertEquals( 0, copy.length );
+		
+		copy = ArrayUtils.copyOfRange( original, 0, 2 );
+		assertEquals( 2, copy.length );
+		for( int i =0; i< 2; i++ ) {
+			assertEquals( null, copy[i] );
+		}
+
+	}
+	
+
+}
diff --git a/core/test/net/sf/openrocket/util/SimpleStackTest.java b/core/test/net/sf/openrocket/util/SimpleStackTest.java
new file mode 100644
index 000000000..16cd312be
--- /dev/null
+++ b/core/test/net/sf/openrocket/util/SimpleStackTest.java
@@ -0,0 +1,43 @@
+package net.sf.openrocket.util;
+
+import java.util.NoSuchElementException;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import org.junit.Test;
+
+public class SimpleStackTest {
+
+	@Test(expected=NoSuchElementException.class)
+	public void testEmptyStack() {
+		SimpleStack<Integer> s = new SimpleStack<Integer>();
+		
+		assertNull(s.peek());
+		
+		s.pop();
+	}
+	
+	@Test
+	public void testPushAndPop() {
+		
+		SimpleStack<Integer> s = new SimpleStack<Integer>();
+		
+		for( int i = 0; i< 10; i++ ) {
+			s.push(i);
+			assertEquals(i+1, s.size());
+		}
+	
+		for( int i=9; i>= 0; i-- ) {
+			assertEquals( i, s.peek().intValue() );
+			Integer val = s.pop();
+			assertEquals( i, val.intValue() );
+			assertEquals( i, s.size() );
+		}
+		
+		assertNull( s.peek() );
+		assertEquals( 0, s.size() );
+		
+	}
+	
+}
diff --git a/core/test/net/sf/openrocket/util/TextUtilTest.java b/core/test/net/sf/openrocket/util/TextUtilTest.java
index 8ac8319d0..4c040fbbe 100644
--- a/core/test/net/sf/openrocket/util/TextUtilTest.java
+++ b/core/test/net/sf/openrocket/util/TextUtilTest.java
@@ -2,13 +2,36 @@ package net.sf.openrocket.util;
 
 import static java.lang.Math.PI;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertArrayEquals;
 
+import java.nio.charset.Charset;
 import java.util.Random;
 
 import org.junit.Test;
 
 public class TextUtilTest {
 	
+	@Test
+	public void testConvertStringToBytes() {
+		
+		Charset us_ascii = Charset.forName("US-ASCII");
+		
+		byte[] ZIP_SIGNATURE_CORRECT = "PK".getBytes(us_ascii);
+		byte[] ZIP_SIGNATURE_TEST = TextUtil.convertStringToBytes( "PK", us_ascii);
+		
+		assertArrayEquals( ZIP_SIGNATURE_CORRECT, ZIP_SIGNATURE_TEST );
+		
+		byte[] OPENROCKET_SIGNATURE_CORRECT = "<openrocket".getBytes(us_ascii);
+		byte[] OPENROCKET_SIGNATURE_TEST = TextUtil.convertStringToBytes( "<openrocket", us_ascii);
+
+		assertArrayEquals( OPENROCKET_SIGNATURE_CORRECT, OPENROCKET_SIGNATURE_TEST);
+		
+		byte[] ROCKSIM_SIGNATURE_CORRECT = "<RockSimDoc".getBytes(us_ascii);
+		byte[] ROCKSIM_SIGNATURE_TEST = TextUtil.convertStringToBytes( "<RockSimDoc", us_ascii);
+		
+		assertArrayEquals( ROCKSIM_SIGNATURE_CORRECT, ROCKSIM_SIGNATURE_TEST );
+	}
+	
 	@Test
 	public void testHexString() {
 		assertEquals("", TextUtil.hexString(new byte[0]));