From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Graph and diagrams comparing the rigidity and periodicity of a Hispano frame versus an E.A.C.7 frame.
| Identifier | ExFiles\Box 29\1\ Scan313 | |
| Date | 21th June 1927 guessed | |
| TORQUE LBS / FT. 1800 1600 1200 800 400 HISPANO FRAME E.A.C.7 FRAME REAR AXLE CLAMPED SOLID TO FRAME. 1° 2° 3° 4° FRAME DEFLECTION ANGLE θ 3.5° ↓P θ FRAME RIDIGITY AND PERIODICITY. | ||