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 Ransome & Marles Bearing Co. detailing bearing capacities and ratings for the Bensport & Peregrine 2.
| Identifier | ExFiles\Box 84\4\ scan0370 | |
| Date | 29th December 1937 | |
| 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 following will make the position clear. The formula on which our ratings are based gives the capacity as ∝ ND^1.75. 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. 2000 1140 1254 12 - 7/16" balls/row. 3000 1000 1100 Contact angle 35° 4500 870 957 4/MDJT.30. supersedes the above and is identical with exception of duralumin cages. 5/MDJT.30. supersedes 4/MDJT.30 and is identical ex ground slots on the face of one outer. 6/MDJT.30 12 - 15/32" balls/row. 2000 1285 1413 Contact angle 35° | ||