Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Heinkel HeS 011 or Heinkel-Hirth 109-011 was an advanced World War II jet engine built by Heinkel- Hirth. It featured a unique compressor arrangement, combining a three-stage axial compressor with a "diagonal" stage similar to a centrifugal compressor, along with a low-compression impeller in the intake to smooth out airflow.