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).
Comparison of engine component weights for the B.60 engine and the Wraith engine.
| Identifier | ExFiles\Box 123\5\ scan0121 | |
| Date | 14th October 1938 | |
| COPY FOR FILES. To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Cr.{Mr Cra???ster / Mr Chichester} 10HH also 658 Typed 14.10.38. B.60 ENGINE WEIGHTS. Engine weights as illustrated in attached photographs .................... 453 lbs. This does not include:- Fan blades....................approx 1 lb. 8 ozs. Fan belts........................." 1 lb. Dynamo.......................... 22 lbs.12 ozs. Self-Starter.................... 24 lbs. Rocker Shaft and Pedestal......... approx 4 lbs. Manifolds and Carburetter as Wraith.... 17 lbs. 4 ozs. Clutch.......................... 28 lbs. Clutch case...................approx 7 lbs. Coils........................... 3 lbs. 4 ozs. Adding these weights to those of the engine one gets } 561 lbs. 12ozs. The weight of a mech. petrol pump is .... 5 lb. 8 ozs. (approx.) Parallel weights for the Wraith are as follows:- Engine in same condition as B.60 engine illustrated........................ 470 lbs. Fan blades...................... 1 lb. 8 ozs. Fan belt........................ 8 ozs. Dynamo.......................... 23lbs. 14 ozs. Self-Starter.................... 22lbs. 9 ozs. Rockers, shaft and pedestals...... 6lbs. 0ozs. Manifolds and Carburetter......... 17lbs. 4 ozs. Clutch.......................... 27lbs. 2 ozs. Clutch Case..................... 8lbs. 15 ozs. Coils........................... 3lbs. 9 ozs. When these weights are added to the previous engine weight one gets } 581lbs. 11½ozs. It must be borne in mind that the B.60 engine incorporates a mechanical petrol pump. Rm{William Robotham - Chief Engineer}/Cr.{Mr Cra???ster / Mr Chichester} | ||