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).
Letter from The Light Production Co. Ltd. concerning the weight and design of Bentley pistons.
| Identifier | ExFiles\Box 86\2\ scan0085 | |
| Date | 19th October 1933 | |
| THE LIGHT PRODUCTION CO. LTD. PROPRIETORS OF THE LONDON PISTON RING CO. LTD. v234 CHAIRMAN & MANAGING DIRECTOR: M.{Mr Moon / Mr Moore} V.{VIENNA} ROBERTS. DIRECTORS: C. E.{Mr Elliott - Chief Engineer} GEORGE. WM. THIRTLE. ENGINEERS 60/66, ROCHESTER ROW, WESTMINSTER, S.W.1. ENG. TELEGRAMS: INLAND NAPOLEONIC, SOWEST, LONDON. FOREIGN NAPOLEONIC, LONDON. CODES: A.B.C. 5TH. EDITION. YOUR REF. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}10/KT. TELEPHONE:- VICTORIA 0671. 5 LINES. OUR REF. CHB/IR WORKS & GOODS ADDRESS: 61/67, GREENCOAT PLACE, WESTMINSTER, S.W.1. All communications to be addressed to the Company. ON ADMIRALTY, WAR OFFICE & AIR MINISTRY LISTS. 19th October 1933. Messrs. Rolls Royce Ltd., Experimental Dept., DERBY. Dear Sirs, For the attention of Mr.Grylls. We thank you for your communication of the 17th, which crossed ours advising you of the despatch of the Bentley pistons. We note your remarks relating to weight, but would say that we should anticipate our design to be somewhat heavier than that shown on your original drawing, and it may be that we have over-estimated the duty which is expected from these pistons and thus made them a little too robust in consequence. You will remember that at the original discussion, a possibility was mentioned of supercharging at a later date, and in order to avoid the necessity for a change in design for this, we have based our inertia calculations on a speed of 5,000 r.p.m. If such a duty were not anticipated, however, we could bring the weight back to a figure more closely approximating to your original piston, if your experiments generally indicate the desirability of such a course. We fully appreciate the authority of your suggestion of high speed roughness resulting from this increased weight, but we have experienced cases where | ||