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).
Report comparing different gear types and recommending a new gear for replacement work based on torque and load data.
| Identifier | ExFiles\Box 96\1\ scan0397 | |
| Date | 8th July 1939 | |
| 2. grain Fabroil, and it is considerably cheaper. We recommend we adopt this gear for replacement work and for the remaining production cars. We have two gears of this type which we will fit to Customers' cars at the first opportunity, and it is proposed to order up a further supply for replacement purposes. It is not proposed to take any action in regard to changing gears on cars in service, except that the opportunity will be taken to fit the new type gear whenever the engine has to be dismantled for any reason. Type of Gear Torque req'd to shear teeth (Tons Ins) Tangential load at 5.66" P.C.D (Tons) No.1 Failure (Ex. Sir Norman Watson) 2.43 0.859 No.2 Failure (Ex. Prof. Lambert Rogers) 2.40 0.848 Original type worn gear 30,000 miles. Unbroken 4.08 1.44 New gear of same type 3.45 1.22 Fabroil A.1047. Fine grain 3.33 1.18 Attwater Gear EXS.437/8 3.90 1.38 | ||