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).
Instructions and test results for a 20/25 Dynamo machine, detailing modifications and performance curves.
| Identifier | ExFiles\Box 62\3\ scan0061 | |
| Date | 13th August 1930 | |
| ROLLS-ROYCE LTD. INSTRUCTIONS. To: EFC Order No.: AD. 63 Customer's No.: X 6005 20/25 Dynamo 124s H.C (for 18 G IV) This machine embodies a 48 coil armature and chamfered poles and is the first to have the die-cast end bracket similar to the 40/50. Attached are curves showing the output with brush settings as received. The temperature rise on the bench was on the lower side of our limits and before sending for fitting to the car, the control was moved by filing (being non-adjustable) to about 12d° without further running being done. The lower curve resulted from inserting a field resistance equal to that adopted for the 40/50 which promises to be a very suitable value. Signed: JAL. This Sheet must be filed on completion of the work. Top left corner: RR 23B (150 BKS.) (OB 451-8 12 24) MP 306975 Top right corner: X6005. | ||