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).
Programme of improvements for the 20HP model, outlining changes in three phases.
| Identifier | WestWitteringFiles\T\2July1928-December1928\ Scan172 | |
| Date | 26th October 1928 | |
| HS.{Lord Ernest Hives - Chair} } FROM R.{Sir Henry Royce} BY.{R.W. Bailey - Chief Engineer} (struck through) C. to BJ. WOR.{Arthur Wormald - General Works Manager} (struck through) " G.{Mr Griffiths - Chief Accountant / Mr Gnapp} OWD. (struck through) " E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} (struck through) " SG.{Arthur F. Sidgreaves - MD} (struck through) ORIGINAL 20HP. PROGRAMME OF IMPROVEMENTS. Y5770 V4663 FIRST MOVE. (IN HAND.) (1) Engine new head, raising compression from 4.8 to 5.5. (2) Larger valves - 1.35 instead of 1.2 inlets etc. (3) Freer exhaust. (4) New intermedial timing gear mounting. (5) Longer frame. We understand you are making at least 3 units, and that the dies for the longer frame will be made at once. It is of the utmost urgency to get longer frame and avoid B. Steering. SECOND MOVE. (6) New dynamo drive. (7) Valve springs. } Jumping at say (8) Long duration cams. } 20% greater speed. THIRD MOVE. (9) Crankchamber as EAC. 10. for saving in weight and cost. (10) Four point suspension. (11) Radiator 1" further forward, deeper, and slightly narrower. (12) Improved acceleration - supercharger, freewheel, or other 3rd. speed move. R.{Sir Henry Royce} | ||