| Year | 2006 |
| Date | 10-Nov |
| Volume | 197 |
| Issue | 4,286 |
| Page | 573 |
| Category | Aeronautical |
| Part | 1 |
| Title | A Freelance Radial Aero Engine |
| Author | Dr. Michael Ackerman |
| Notes | An account of his latest engine. Outline design, description of the radial engine, construction, outline specification, test rig, references |