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).
Road test log detailing vehicle performance, modifications, and faults over a series of runs.
| Identifier | ExFiles\Box 71\4\ scan0161 | |
| Date | 28th December 1924 | |
| - 4 - Date. Tested by.{R.W. Bailey - Chief Engineer} miles run. Total miles. Remarks. 26.II.24. "HS{Lord Ernest Hives - Chair}" & G.W.H. 12 13,494 Friction pads removed from rear torque reaction dampers. Reaction torque dampers do not make any difference. 16 x 52 axle fitted - taken off 40 PK. 5.12.24. "BJ" & Maj.Cox. 127 13,621 No report. Gerrards X & district. 7.12.24. "Sg{Arthur F. Sidgreaves - MD}" & E.{Mr Elliott - Chief Engineer} Bagley. 111 13,732 No report. Gerrards X & district. 8.12.24. "BJ" & E.{Mr Elliott - Chief Engineer} Bagley. 173 13,905 No report. Gerrards X & district & return to Derby. 10.12.24 Rear axle changed to 15 x 52. 23.12.24 to "EP{G. Eric Platford - Chief Quality Engineer}" Derbyshire. 405 14,610 Generally very good. Improvement on 40/50 HP. for performance, quietness & sweet running. Engine signs roughness - retard 55 to 45. Drive groans noticeable but not bad 20 - 30 - 48. Third gear 20 & 30. Rattle noise forward drive 30. Axle noisy retard - or tyres bad noise. Groans bad on sets & grunts low speeds (plain roads) - Pomeroy Burton trouble. Brakes squeak bad, & too grabby, & mechanical clatter, & mechanism squeaks. Front springs - bump on bad pot holes, etc. Change gear - too hard against side movement springs & too close fitting. Steering very good. Carburation - picks up weak, but otherwise too strong. Exhaust noisy - spitting (never starts off switch - contact O.K.) Side shaft - uneven rattle (dry noise - bearing). Gears very good. Clutch - chatters. Ground clearance seems much less than 40/50 HP. Suggest point for consideration by all concerned. 40/50 ground clearance (L.A.C.II) 10" L.A.C. " " (93 NK) 6.75" | ||