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).
Chassis, passenger, and unsprung weights for the purpose of calculating the correct poundage for Wraith springs.
| Identifier | ExFiles\Box 9\5\ 05-page211 | |
| Date | 16th May 1938 | |
| 646 To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} c. By/HEB.{H. Biraben} Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}7/MH.{M. Huckerby}16.5.38. WRAITH SPRINGS. We are sending with this memo a graph which gives the correct poundage of spring to be fitted on a chassis with a body of given weight. The graph is based on the following information :- Wraith Chassis weight: N.S.F. Wheel 830 lbs. O.S.F. Wheel 910 lbs. Each Rear Wheel. 740 lbs. Total 3220 lbs. = 28 3/4 cwt. Passenger weight : total 580 lbs. Front: 85 lbs. per wheel. Rear: 205 lbs. per wheel. Unsprung weights. 130 lbs. per front wheel. 250 lbs. " rear " Body weight 72% on rear wheels. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} | ||