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).
Blueprint comparing different stroke lengths for standard and short stems.
| Identifier | ExFiles\Box 170\2\ img025 | |
| Date | 2nd April 1931 | |
| 1650 7 1/2 ARM 640"-1" (STD) OG - STD. STEM (STD) OG - STEM 3/64 SHORT 4" STROKE 7" STROKE 7" STROKE 4" STROKE Numbers on left diagram: 300, 250, 200, 150, 100, 60 Numbers on middle diagram: 200, 150, 100, 60 Numbers on right diagram: 300, 250, 200, 150, 100, 60 D Furnace DLY 2.4.31 | ||