Nine engines on the first stage of the new launcher created by U.S. Company SpaceX, Falcon 9 v1.1 are not located 3x3 grid, as modified v1.0, and a circle with one engine, which is located in the center.
Central rocket motor will produce a lead management work swing and roll missiles.
For this it was necessary to expand the space between him and the other eight engines of the rocket. That's what experts set out to change the layout of the first stage of the launch Falcon 9 v1.1.
Some people also pay attention to the fact that at the moment two peripheral motor (left and right) are issued ahead as central as it is shown in the picture above. But in turn, strengthen the role of one engine is necessary for the gradual transition to a reusable first stage of the rocket. The test device of the company jet SpaceX Grasshopper, to keep the rocket landing on the Earth's surface only uses one central engine.
The first test run of PH Falcon 9 v1.1 planned to make a Vandenberg / pc. California / September 5, 2013. In orbit, the rocket should deliver such satellites 8.