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).
Design options for a battery support subframe, weighing a cantilever scheme against a tubular cross member.
| Identifier | ExFiles\Box 19\4\ Scan002 | |
| Date | 3rd June 1930 | |
| c. Hs.{Lord Ernest Hives - Chair} X7 772. BY6/G.3.6.30. L.H. CHASSIS - RE BATTERY SUPPORT WITH UNIVERSAL SUBFRAME. Referring to N. Sch. 3114 we are in very grave doubt as to the suitability of the cantilever scheme proposed, as a matter of fact the tubular member can be used, utilizing the brackets you show for bolting the battery box to, but supporting the brackets on a cross tube instead of a cantilever. If we could arrive at an agreement to use a tubular cross member for supporting the rear of the battery, then one could risk ordering the universal subframe for N.2 series, but if the cantilever scheme for carrying the rear of the battery box is insisted upon nothing could be done until the battery box scheme has been tried out on the 10,000 miles test. This matter is urgent, as at the moment we are working on N. Sch. 3114, and instructed it for the first L.H. chassis as well as the second, in order to get the 10000 miles test in, but the cantilever scheme seems to me to be a very doubtful factor. The scheme for reinforcing the top of the battery box in order to produce something to which the battery for supporting it may bolt, appears to me to be involved and costly. I would much prefer the alternative scheme, or better still two brackets, one at each side, carried well down the box, instead of carrying the weight of metal across the back of the box where the centre portion of it appears to be practically no use, and therefore good metal badly disposed. I would like to have the whole matter re-considered, but it will have to be quickly as the matter is urgent. BY.{R.W. Bailey - Chief Engineer} | ||