| Year | 2006 |
| Date | 08-Dec |
| Volume | 197 |
| Issue | 4,288 |
| Page | 676 |
| Category | Aeronautical |
| Part | 2 |
| Title | A Freelance Radial Aero Engine |
| Author | Dr. Michael Ackerman |
| Notes | Continues the story. Radial cylinder head temperature, engine trial 2 - toward design speed, engine trial 3 - full power testing, radial performance data, engine trial 4 - trails and tribulations, references |