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).
Request to redesign the B.60 Camwheel to have a lower moment of inertia, comparing it to a Studebaker wheel.
| Identifier | ExFiles\Box 124\2\ scan0098 | |
| Date | 28th March 1940 | |
| 1044 To Jar.(Park Leys) c. to Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} Rm{William Robotham - Chief Engineer}/JRS.9/JH.28.3.40. B.60 Camwheel. The B.60 camwheel has a moment of inertia of 9.34 lbs.in.sq. and a weight of 2 lbs. while the Studebaker wheel has a moment of inertia of 4.04 lbs.in.sq. and weighs 1 lb.1 oz. The Studebaker wheel is slightly smaller, having a pitch diameter of 6" against 6.7266" for the B.60 but it is 1/16" wider. Will you please try to design us a wheel having a moment of inertia as low as that of the Studebaker or failing that as low as possible. This is required because the stress in the gear teeth are produced mainly by accelerating the camwheel. Rm{William Robotham - Chief Engineer}/JRS. | ||