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).
Brief analysis of a 260 HP German Mercedes engine's performance characteristics.
| Identifier | Morton\M8\ img018 | |
| Date | 2nd July 1917 | |
| To EH. from R.{Sir Henry Royce} c.c. to J.{Mr Johnson W.M.} ORIGINAL R6/B29:6:17. 3 X.3111 Re 260 HP Mercedes Engine. Thank you for your report on the 260 HP German Mercedes engine. Since this engine appears heavy, roughly 3.7 lbs. per HP, it does not show any very great advance. We did not notice any remark in your report as to the speed this engine was intended to run at, so cannot work out the mean pressure or whether the propeller is likely to have good efficiency. R.{Sir Henry Royce} [Handwritten note] I have seen Com. Briggs and he explained how they have (in the above engine) arranged the valve mechanism to avoid oil leaks, this is a decided interesting feature. FHR [Stamp] RECEIVED 2 JUL 1917 | ||