First pic but it should also balance when turned through 180 degrees as well. If you read through the links in the [link=http://www.rcuniverse.com/forum/m_3120686/tm.htm]sticky[/link] especially [link=http://www.geocities.com/jwohlt5362/Propguide2.html]this one[/link] you will get a good idea of what you are trying to achieve.