| Year | 1944 |
| Date | 20-Apr |
| Volume | 90 |
| Issue | 2,241 |
| Page | 372 |
| Category | Model Aeronautics |
| Part | |
| Title | The Problem of Power |
| Author | Lawrence H.Sparey |
| Notes | A single-cylinder compressed-air engine with piston valve, a pair of twin-cylinder air engines, a three-cylinder compressed air engine with cone valve, a "utility" compressed-air tank made from dried milk tins, a correction |