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 Automotive Products Company discussing the efficiency of their hydraulic braking system and potential mechanical losses.
Identifier | ExFiles\Box 120\3\ scan0029 | |
Date | 20th October 1932 | |
84456. THE BRITISH MADE LOCKHEED HYDRAULIC BRAKING SYSTEM E.{Mr Elliott - Chief Engineer} B. BOUGHTON W. EMMOTT D.{John DeLooze - Company Secretary} T. BROCK Manufacturers and Controllers of European Rights Automotive Products Company Brock House, Langham Street, London, W. 1. Telephone LANGHAM 1373 (3 LINES) Telegrams AUTODUCTS LONDON Works LEAMINGTON SPA 20th. October 1932. Our ref:-EBB/DA.{Bernard Day - Chassis Design} Your ref:- Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}5/KT. Messrs. Rolls-Royce, Ltd., DERBY. Attention: Mr. W. A.{Mr Adams} Robotham Dear Sirs, We thank you for your letter of the 18th. inst., in reply to ours of the 17th. inst., in connection with some tests made by you. Without knowing exactly the conditions of your test, we do know that considerable efficiency can be lost in the mechanical hook up, bearings and so on, and the fact that you again fitted an additional mechanical part would quite possibly have added to any mechanical loss. We would confirm to you that the efficiency of the hydraulic braking system under normal, average working loads is between 85% and 90%, but the mechanical loss due to mounting of the operating parts at either end, of course can add further losses, but with a good installation we do attain the figures published in the S.A.E. Journal. As a matter of interest, and as you now raise this matter, we shall be only too pleased to conduct some further tests wherein we shall definitely ascertain the individual losses at each point, and on completion of these tests shall be pleased to let you have further information. [Text in left margin:] Quotations and Contracts are subject to revisions of Duty, Transportation Costs, and to acceptance by the Factory, also to unforeseen delays arising from strikes, lockouts, transportation, war, &c. and majeure. | ||