| Year | 1923 |
| Date | 19-Apr |
| Volume | 48 |
| Issue | 1,147 |
| Page | 396 |
| Category | Aeronautical |
| Part | |
| Title | Power Plants for Model Aeroplanes |
| Author | A.F.Houlberg |
| Notes | Paper to SMAE. Flash steam plant, rubber motors, formula for gear centres, formula for obtaining pitch of standard involute gears, CO2 motors, compressed air motors, badly spaced gears, steam motors, petrol motors |