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).
Selection, suitability, and modification of various battery types for the Goshawk project.
| Identifier | ExFiles\Box 38\5\ Scan205 | |
| Date | 22th March 1922 guessed | |
| Contd:- -2- EFC3/T. Smaller Goshawk Type Battery. YH414P In this case, we have had up to the present two of your BD.{Mr Berend}7 and 4 HDE.9 batteries, the good points of the former being durability and the latter cranking ability. Up to the present none of these have been on test on a car, though the usual bench tests have been carried out. Two of these batteries have been submitted to us as representatives of the size suitable for the space we have provided. The tendency appears to be that, of the two, you favour the BD.{Mr Berend}7 type and in this respect we are in agreement with your view, but you have stated very definitely that you do not consider that the space provided is sufficient to render either battery mentioned above suitable for the purpose. You would prefer us to adopt your BD.{Mr Berend}9 type, in which the good qualities, already mentioned above, of each battery are combined in one. Unfortunately, we cannot accommodate the BD.{Mr Berend}9 type made up in a case, in our battery box without radical alterations to our chassis design, or going to the footboard position. As a result of Mr. Minchin's visit, we are again putting the matter in front of our Chief Engineer for a definite decision. For this purpose we have already written to our Mr. Hives, who is with him at the moment, to take up the matter verbally. We are also putting up the other points for consideration, namely, the suggestion of your Mr. Minchin that a group of 6 cells of the BD.{Mr Berend}9 type can be accommodated minus the case in our battery box, and that the idea of sending along our battery boxes to have the battery sealed into these boxes might be entertained. It was found we could do this in our present box with the addition of a little packing at either end. Should we decide eventually to adopt neither of these proposals, then it is understood that further BD.{Mr Berend}7 type batteries that we require will be deepened so as to make the best use of the space we have allowed in the box vertically, the amount of deepening being about 15% on the plate section, corresponding to about 15% increase of capacity. This will be a material increase on the small capacity of the present BD.{Mr Berend}7. It being now definitely agreed that of the two alternatives, BD.{Mr Berend}7 and HDE.9, the former is the most desirable, taking everything into consideration, we venture now to suggest that you should have prepared for us two of these modified BD.{Mr Berend}7 batteries at the earliest possible moment, and that we should return to you in exchange two of the HDE.9 type which we still have in a dry and new condition. Contd. | ||