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 a bearing company detailing revised bearing capacities and formulas for specific engine models.
| Identifier | ExFiles\Box 84\4\ scan0368 | |
| Date | 29th December 1937 | |
| X 202 RANSOME & MARLES BEARING CO., LTD. NEWARK -on-TRENT. Tech. Dept. RCW/AD. Messrs. Rolls-Royce Limited, D E R B Y. 29th December, 1937 For the attention of Mr. Hardy, Designs Dept. Dear Sirs, In reply to your queries we trust that the follow- ing will make the position clear. The formula on which our ratings are based gives the capacity as αND^.75 We have recently revised our bearing capacities, and the new capacities for the bearings supplied to your or designed to suit your requirements are: For the Bensport & Peregrine 2. Speed. Capacities lbs. Journal. Thrust. 3/MDJT.30. 12 - 7/16" balls/row. 2000 1140 1254 Contact angle 35° 3000 1000 1100 4500 870 957 4/MDJT.30. supersedes the above and is identical with the exception of duralumin cages. 5/MDJT.30. supersedes 4/MDJT.30 and is identical except for ground slots on the face of one outer. 6/MDJT.30 12 - 15/32" balls/row. 2000 1285 1413 Contact angle 35° | ||