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).
Specification details for a new smaller car chassis, including engine dimensions and other key measurements.
| Identifier | WestWitteringFiles\E\November1920\ Scan21 | |
| Date | 19th November 1920 | |
| To-CJ. from R.{Sir Henry Royce} Copy to EAC. * RH.{R. Hollingworth} * RGK. * FH. * O.{Mr Oldham} * DA.{Bernard Day - Chassis Design} * HS.{Lord Ernest Hives - Chair} ✓ * HY.{Tom Haldenby - Plant Engineer} * HF.{H. W. Frost - Coachwork Inspector} ORIGINAL. R4/C17/11/20. *3 DF 19 NOV 1920 RECEIVED X.4219. RE SMALL R.R. CHASSIS. (1) With reference to the smaller model R.R., it is now understood that the price, the horse power, both actual and treasury rating, and the weight and cost of this chassis shall be between .5 and .6 of the cost of the larger chassis as far as possible. (2) This result is to be obtained by reducing to the greatest simplicity the construction, so that this model may be considered the small and simple R.R., and the larger model might be called the large and magnificent. (3) It is not considered advisable to depart far from the dimensions of the "Goshawk" chassis or engine dimensions. To meet C's views and for general improvement I have added 6" to the wheelbase. X.4225 X.4260 X.4229 X.4286 (4) The specification will therefore be as follows:- Six cylinder 3" bore 4½" stroke. Treasury rating 21 HP. Actual B.H.P. expected with car carburettor - 52 Wheelbase 126" = 10'6". Track 52" = 4'4" Body room 72" from behind the dash to the front of the rear wheel. 96" from behind the dash to the end of body part of the frame. Frame width 34". The wheels will be between 760 x 90 } Sales choice. and 815 x 105 } Overhead valves operated by push rods. Detachable head. Single ignition by our own non-trembler battery ignition. Road clearance will be at least 9", probably 10" (Contd. | ||