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).
List of experiments fitted to an experimental airship engine.
| Identifier | ExFiles\Box 52\3\ Scan226 | |
| Date | 15th March 1917 | |
| X.2814. To EFC. {E. Fowler Clarke - Electrical Engineer} from Mr. Coverley. EFC {E. Fowler Clarke - Electrical Engineer} 13/T15317. 15th March 1917. The following experiments have been fitted to Experimental Airship Engine :- X. 2141B - Phosphor bronze instead of mild steel union nuts for water cooled exhaust pipe. drain X. 2241 - Additional oil pipe from sump to crankcase. X. 2814 - Remy ignition. (Sgd). R.H.C. | ||