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 die-cast piston for the X.3400 chassis.
| Identifier | ExFiles\Box 35\2\ scan 023 | |
| Date | 1st November 1920 guessed | |
| To Eh. from E.{Mr Elliott - Chief Engineer} c. to EY. c. to DaS c. to EFC. --------- E1/G261.18. X.3400 - RE CHASSIS PISTON We attach herewith confirmation of our telegram of even date, concerning the above, also the sketch referred to in the telegram. The piston shewn on the sketch is intended to be suitable for manufacture by die casting. The design is exceedingly plain and errs we think possibly in not providing sufficiently against distortion of the skirt. It should be tried however, in the form shewn, and we will afterwards adde any further faetures that may be found necessary. The crown in the dentre need not be very thick, because at this point no great heat flow occurs. The thickness however, should increase very rapidly towards the si side of the piston. This particular design of crown has been found to give better results than those of the ribbed variety by the R.A.E. The heatt flow from the crown is deflected round the corner into the metal behind the rings. A certain amount of heat is lost oppisite the rings, and hence the inside may taper slightly. The piston wall then passes round the corner oppisite the rings, and from this position tapers from a thickness of .3" to a thickness of .150" at the base of the piston. Contd:- | ||