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 improvements for the E.A.C.10. engine's water pump gland, inlet pipe, and cylinder block rib.
| Identifier | WestWitteringFiles\R\January1928-March1928\ 19 | |
| Date | 16th January 1928 | |
| -R.{Sir Henry Royce} FROM E.{Mr Elliott - Chief Engineer} C. to B-d.{John DeLooze - Company Secretary} H/RM.{William Robotham - Chief Engineer} E.A.C.10. ENGINE. ORIGINAL X7770 X7150 X8150 We send you herewith blueprints LeC.2504. & 2507. The former shews the drawing to which Derby is working for the water pump, ignition tower, oil pump, and throttle governor drives. Regarding the water pump gland this should be even better than the present Phantom for the following reasons: (1) The pump spindle is smaller .437 instead of .562. (2) The external joint is a Hardy fabric coupling and more flexible than the present toothed coupling for accommodating any eccentricity in the pump mounting. There have been cases of leaky glands due to pump brackets being changed, throwing out the pump, and too well fitting toothed coupling binding. (3) The pump is flange mounted and hence the degree of eccentricity should be very small, and interchangeability assured. (4) The spring portion of the gland is made so that it is adequately guided and supported. The present pump gland I find is made as in sketch, and one fears that washer A.{Mr Adams} may get cross wound with a defective packing, and piece B. is not properly supported. We have specified a bronze spring for the gland. Regarding the location of the pump rotor endways the wooden thrust piece is said to be unsatisfactory, and one wondered if chromium plated faces would be better. We have only shewn these by way of a suggestion. Regarding the inlet water pipe from pump to cyl. this is shewn on LeC.2504. with single bolt joints as originally agreed. We find however with this sch. it is difficult to make a satisfactory job of the cyl. The weight carrying rib in the cyl. block has been arranged on a tripod as in sketch but we think sch. LeC.2507. (attached) is preferable. With the latter however it is not possible to detach the water pipe without first removing the pump, nevertheless we still think LeC.2507. is better, and have instructed Derby to work accordingly. E.{Mr Elliott - Chief Engineer} | ||