Blueprint showing three different cross-sections of a front wing for the 15 EX model.
| Identifier | ExFiles\Box 18\2\ Scan040 | |
| Date | 1st October 1928 | |
| FRONT WING SECTIONS - 15 EX. 1-10-28 A FRONT POINT .400 .550 1.100 1.350 B REAR OF SIDE LAMP 18" FROM FRONT POINT 110° 1.450 1.500 .077 C REAR 5' FROM FRONT POINT 1.000 .550 1.000 1.250 | ||
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).