Letter from W. H. Colt Ltd. discussing engine cooling, heat build-up, and potential fan modifications.
| Identifier | ExFiles\Box 119\3\ scan0165 | |
| Date | 28th October 1931 | |
| W. H. {Arthur M. Hanbury - Head Complaints} COLT, LTD. BETHERSDEN NEAR ASHFORD KENT TELEPHONE BETHERSDEN 6 TELEGRAMS COLT BETHERSDEN KENT WHC/V/P. BUSH HOUSE ALDWYCH LONDON. W.C.2 LONDON DIRECTOR: I. J. {Mr Johnson W.M.} O'HEA, F.C.I.S. TELEPHONE AND TELEGRAMS TEMPLE BAR 5112 28th October, 1931. Your Ref: Lp {Mr Lappin} 4/IAM241031. Messrs. Rolls-Royce Ltd., 14/15, Conduit Street, London, W. 1. Dear Sirs, I am in receipt of your letter of 24th inst., acknowledging our drawings. I should have liked a few diagrams showing disposition of engine in relation to radiator and dash board, also the exact profile of sump. From the data at my disposal regarding your large and small models, I understand that the engine block is close up to dashboard, indicating that there must be considerable piling up of engine heat which as far as I can see under present conditions can only get away via flywheel and tray. This circumstance no doubt accounts for certain drawbacks under particular conditions of travel, detracting also from the performance of the fan normally employed. Before engaging therefore in experiments I would suggest, if I may, that you try out the exact effect obtained by fitting first our ventilator as shown on our blue print No.27. This should be made up to a height not less than 12", one at each side of rear end of bonnet and as high up as possible, just short of the dash board. This would reveal how much your present fan is capable of in suction there being a free release of pressure at dash board. This procedure would do away with the necessity of piercing the bonnet for "louvres". The degree of extra control of radiator temperature obtained by this means will determine the need or otherwise for replacing your present type of fan by one designed and tested on aero-dynaic lines. | ||
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).