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 of a 'Condor' slipper piston, including a sketch.
| Identifier | ExFiles\Box 77\1\ scan0010 | |
| Date | 28th January 1920 | |
| X.2974 To Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} Copy to CJ. " " Bn.{W.O. Bentley / Mr Barrington} " " Hs.{Lord Ernest Hives - Chair} " " Ck.{Mr Clark} E3/G28.1.20. X.3879. - RE "CONDOR" SLIPPER PISTON. X.2974. We send you under separate cover per registered post a dis-cast aluminium Ricardo piston made for a four-cylinder 10 H.P. engine. This model will illustrate most of the following points. Your memo stating that you are sending to Mr. Ricardo for particulars of a 5¼" piston of the slipper type has been received, but as we received your blue print before the last memo from here reached you, Mr. Royce thinks it is worth while to send along the following information in respect to N. scheme 234. (1) On Ricardo piston, the slipper surface alone touches the cylinder, the upper portion containing the rings being made clear. The slipper should therefore be made as long as possible. This is effected by making the piston surface continuous as a casting, and milling a slot through afterwards, as shown in the sketch. (2) As it is desired to obtain as uniform a distribution of heat as possible on the slipper surfaces, latter must not be connected to the crown except by the cross webs. The piston therefore, should be made as in the above sketch, with holes at AA{D. Abbot-Anderson} through the main webs, and the slots already mentioned sawn through at BB. Contd. R.R. 235 A (100 S.F.) (T.S.E. 346. 6-S-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2460. | ||