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).
Specifications for crankshaft balancing and component design.
| Identifier | WestWitteringFiles\H\March1922\ Scan16 | |
| Date | 17th March 1922 guessed | |
| (2) (4) The radiussing at each end of the crankpin bores balances out for all the cranks. (5) Crank webs a & d must have dimension X so fixed that they are in individual balance excluding the radiussing in the end of the crankpin bore but including the oil bore and the plug E50125 with washer. (6) Crank webs b & c are perfectly symmetrical and apart from the oil holes and the radiussing of the crankpin bores are individually in balance. (7) The distance between crankwebs b & c must be so fixed that the following are balanced out:- (a) Crankpin collars e.f.g. & h.{Arthur M. Hanbury - Head Complaints} (b) The amount by which crankpin oil cap bolt No. 2 exceeds 1 or 3 in weight. (c) Oil drillings, plugs and washers in webs b & c. (8) Owing to the locking tabs of washer E50124 not balancing out as regards couples if used on this crank (this also occurs on Gos. 11. crankshaft) we propose using a symmetrical washer as shewn on the drawing. This may as well be put right and there appears to be no reason why E50124 should not be replaced by this pattern when convenient. With regard to dimensions X & Y on the crankshaft we should be glad if you would have these exactly calculated in Derby. As drawn on LeC 1540 they are only approximately right. Aluminium die cast oil caps of the same pattern are used for both pins and journals. We should have liked to have used the die castings of Gos. 11. crankshaft but these were unsuitable as regards length and would have covered up the oil ways. Particulars of the keyways in the tapers on each end of the crankshaft will be sent later. E.{Mr Elliott - Chief Engineer} | ||