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).
The weight allowance on the 40/50 HP main springs to counterbalance the battery and spare wheel.
Identifier | ExFiles\Box 67a\2\ scan0153 | |
Date | 7th August 1928 | |
CWB. c. Hs.{Lord Ernest Hives - Chair} c. EP.{G. Eric Platford - Chief Quality Engineer} XS410 BY14/G.7.8.28. 40/50 HP. MAIN SPRINGS. -------------------- Referring to CWB3/GM/31.7.28. the facts of the case are that we are making an allowance of 50 lbs. heavier on the offside springs for both front and rear, but since the rear spring is a cantilever the allowance on the spring poundage is twice that amount viz. 100 lbs. From the list you have given me it is evident that we usually keep on the light side - 101-AL for some reason is slightly heavy, but even then it is only a matter of 12 lbs. The allowance in question has always been made and was intended to counterbalance the effects of the battery and sometimes the spare wheel being carried on the offside. The battery weighs roughly 100 lbs. so actually it is an allowance to meet the battery weight carried on the running board. Where batteries are carried inside the frame it could be dispensed with, possibly in any case the provision of the 50 lbs. was unnecessary. I will take the matter up with Hs.{Lord Ernest Hives - Chair} and EP.{G. Eric Platford - Chief Quality Engineer} when they return from their holidays. BY.{R.W. Bailey - Chief Engineer} | ||