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).
Calculation sheet for vehicle moment of inertia, unsprung mass, and spring rates.
| Identifier | ExFiles\Box 100\1\ scan0260 | |
| Date | 20th July 1939 | |
| Rm{William Robotham - Chief Engineer}/HFP.3/MH.{M. Huckerby}20.7.39. Axis about Moment of Inertia was measured Diagram annotations: CG 8.35" 64 1/2" 59 1/2" A 7" 33" 14" 1893 lbs 3922 lbs 2029 lbs Moment of Inertia about A 97,100 lbs.ft2 Moment of Inertia about Centre of Gravity 71,300 lb.ft2 Inertia of wheels 41.85 lb.ft2 per wheel. Unsprung mass including wheels - front 260 lbs. total. rear 410 lbs. total. Spring Rates measured at wheel - Front N.S. 130 lbs/inch. O.S. 135 lbs/inch. Rear N.S. 150 lbs/inch. O.S. 155 lbs/inch. | ||