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).
Electrical equipment development, comparing three different dynamo models.
| Identifier | ExFiles\Box 168a\4\ img186 | |
| Date | 22th April 1941 | |
| To Ev.{Ivan Evernden - coachwork} From Re/RG.{Mr Rowledge} Copy to Mr. SW/JD.{J. Draper - Frames} Rm{William Robotham - Chief Engineer}/RG.{Mr Rowledge}S/T.22.4.41. ELECTRICAL EQUIPMENT DEVELOPMENT DYNAMOS. There are at the moment three models under observation:- (i) R.R.36 slot dynamo (Smith & S-V). (ii) Lucas C45PV " (Rover). (iii) Lucas C45YV " (Sunbeam - Talbot). As stated in our review of the electrical equipment Rm{William Robotham - Chief Engineer}/RC.{R. Childs}1/SW.17.6.40, the R.R. machine is to be fitted to the B.80 and probably to the B.60. The Lucas "C45PV" will be fitted to the B.40. Since then the Myth has come along and we intend trying the Lucas "C45YV" type for this car. The weight and outside dimensions of the above dynamos are as follows:- (i) R.R.36 SLOT - 5" diameter, 8 1/4" long (excluding pulley), weight 24 lb. 4 oz. (no pulley). (ii) LUCAS C45PV - 4 1/2" diameter, 7 1/4" long (excluding pulley), weight 19 lb. 14 oz. (no pulley). (iii) LUCAS C45YV - 4 1/2" diameter, 6 1/4" long (excluding pulley), weight 16 lb. 14 oz. (no pulley). R.R. 36 SLOT DYNAMO - This dynamo can cope with a load of 18 amperes and "cuts in", taking an operating voltage of 13 volts, at about 960 r.p.m. (Hot). This dynamo can supply prolonged loads of 20 amperes at high speeds, without burning out, but the result is premature wearing of the brushes. In France, on our car tests, the dynamo was actually subjected to the above conditions, with a resultant brush life of about 10,000 miles. LUCAS "C45PV" DYNAMO - This machine can cope with a load of 14 amperes. Actually the makers limit it to 13 amperes. | ||