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).
Technical comparison of front seat widths and door thicknesses for various coachwork models.
| Identifier | WestWitteringFiles\T\March1929-December1929\ Scan019 | |
| Date | 7th March 1929 | |
| R.{Sir Henry Royce} FROM DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} C. to SG.{Arthur F. Sidgreaves - MD} LHS.{Lord Herbert Scott} HS.{Lord Ernest Hives - Chair} SX. C. re. COACHWORK. X5830 X7830 X393 WIDTH OF FRONT SEATS. I have taken the opportunity when in London to investigate the question of body widths and door thicknesses. 20HP. 12-G-4. BARKERLITE CLOSE COUPLED COUPE A - Width between rails ...... 46.500 B & C - Thickness of finishers .... .375 Actual width at elbow line .. 45.750 D - Thickness of door (without finishers) .. 3.000 14-G-4. HOOPER SEDANCA. A - Width between rails .................... 44.5 B - Thickness of finishers (offside) ..... 1.500 C - " " (nearside) ..... .625 about. Actual width at elbow line .............. 42.500 Thickness of door less finishers ..... 3.625 It will be seen that due to the thick finishers, as a result of the Hooper signalling window, the driver feels as though he is in a seat of 41.5 at elbow line, as all the extra door thickness is taken off the dimension E.{Mr Elliott - Chief Engineer} which is the elbow room. STANDARD BARKER 20HP. BODIES: Same as 12-G-4. and the same elbow width as 12-G-4 = 45.75. 16-G-4. BARKER CLOSE COUPLED ALLWEATHER. We are making this to give 45.75 at elbow line. B & C - Width of doors - 3.125. 18-EX. BARKER SPORTS SALOON. A - Width between rails .................... 46.750. B & C - Thickness of finishers ................... .500. Actual width at elbow line between finishers 45.750. Thickness of doors (without finishers) ..... 3.125. This would appear to be an absolute minimum. 19-EX. HOOPER SEDANCA. A - Width between rails .................... 48.000 B - Thickness of finishers (offside) ... 1.625 " " (nearside) .. .625 Width at elbow line .................... 45.750 Door thickness ......................... 3.750 (1) | ||