Rolls-Royce Archives
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).
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Improvements to the vehicle's electrical field circuit and dynamo output for battery charging.6th May 1930Box 163 \ 6  img040
Extract from a report discussing a reduced charge switching scheme for a dynamo.16th May 1930Box 163 \ 6  img041
Dynamo armature types, their outputs, modifications, and charging schemes for the 20/25 HP model.16th May 1930Box 163 \ 6  img042
Page of a report noting that for a given peak reduction, the curve did not improve and watts were higher than expected.22th May 1930Box 163 \ 6  img043
Specification for resistance wire for a half charge scheme.22th May 1930Box 163 \ 6  img044
Revision notice for the resistance value related to reduced charge switching.23th May 1930Box 163 \ 6  img045
Specification for half charge resistances to avoid misinterpretation on drawings.27th May 1930Box 163 \ 6  img046
Extract from G.W. Hancock's report on a 24-EX vehicle at 6,000 miles detailing dynamo output and condition.20th Jul 1930Box 163 \ 6  img047
Extract from G.W. Hancock's report detailing a dynamo failure during a 10,000-mile test on car 24-EX.15th Aug 1930Box 163 \ 6  img048
Request to obtain one dozen half charge resistance carriers, part number D.72623.8th Aug 1930Box 163 \ 6  img049
Standardisation of a switchbox, distribution box and field resistance unit for half/full dynamo output.18th Jun 1930Box 163 \ 6  img050
Requesting a road test for a 48-coil high output dynamo on car 24-EX.15th Sep 1930Box 163 \ 6  img051
Performance graph showing the output speed curves for a 40/50 HP S.S. Dynamo with pole piece modification for high output.11th Oct 1930Box 163 \ 6  img052
Requesting six sets of switching parts for a half-charge scheme to be installed on trials cars.11th Oct 1930Box 163 \ 6  img053
Instructions and parts list for fitting a special Dynamo and Charge-Control Scheme to a 20 HP chassis.15th Oct 1930Box 163 \ 6  img054
Testing reduced charge switching arrangements and changing the specification for the resistance units.7th Oct 1930Box 163 \ 6  img055
Confirming the dispatch of 6 sets of switching parts and 6 dynamos for testing on Trials Cars.17th Oct 1930Box 163 \ 6  img056
On the test results of six sets of reduced charge switching arrangements, noting issues with clearances and pigtail fittings.21th Oct 1930Box 163 \ 6  img057
Specification for production inspection and test of a 20/25 HP switchbox.24th Oct 1930Box 163 \ 6  img058
Set of instructions for testing electrical terminal connections and lighting circuits.27th Oct 1930Box 163 \ 6  img059
Confirming the satisfactory testing of six sets of reduced charge switching apparatus, now awaiting fitting instructions for trials cars.27th Oct 1930Box 163 \ 6  img060
The handover of six half-charge dynamos for fitting to demonstration cars.29th Oct 1930Box 163 \ 6  img061
Attaching updated pages for the Production Inspection and Test specification for the Distribution Box and Cutout.16th Oct 1931Box 163 \ 6  img062
Specification for the production inspection, adjustment, and testing of the distribution box and cutout.16th Oct 1931Box 163 \ 6  img063
Testing procedures for a dynamo and distribution box, detailing voltage, current, and resistance parameters.16th Oct 1931Box 163 \ 6  img064
Procedure for testing the cutout contacts and ammeter reading of a dynamo.16th Oct 1931Box 163 \ 6  img065
Wiring diagram for a 40/50 distribution box and cutout test.5th Nov 1930Box 163 \ 6  img066
Requesting the fitting of a new daylight running reduced charge electrical system to Sg's car for testing.5th Nov 1930Box 163 \ 6  img067
Cover note for the specification of inspection and test for a dynamo field resistance unit.6th Nov 1930Box 163 \ 6  img068
Production test and inspection procedure for a dynamo field resistance unit.6th Nov 1930Box 163 \ 6  img069
Cover letter for the Specification of Inspection and Test for a 40/50 HP Switchbox.6th Nov 1930Box 163 \ 6  img070
Production inspection and testing specification for a 40/50 HP switchbox arranged for half-charge switching.6th Nov 1930Box 163 \ 6  img071
Set of electrical testing procedures for a component using a 12-volt battery and lamp.25th Nov 1920Box 163 \ 6  img072
Criticizing the performance of a new type dynamo due to its inadequate charging rate at low speeds.25th Nov 1920Box 163 \ 6  img073
The transfer of a standard dynamo taken from vehicle 58-GN.25th Nov 1930Box 163 \ 6  img074
Half-charge dynamo scheme using a changeable resistance unit to regulate output.26th Nov 1930Box 163 \ 6  img075
Dynamo design, 'cutting in' points, resistance values, and various charging schemes.26th Nov 1930Box 163 \ 6  img076
Recommendation to proceed with experimental work on a system with advantages for varying running circumstances.26th Nov 1930Box 163 \ 6  img077
Proposal for two modified Resistance Units with identification tags to solve a vehicle's battery charging issue.26th Nov 1930Box 163 \ 6  img078
Fitting of a half charge scheme to car 18-EX.28th Nov 1930Box 163 \ 6  img079
Visit to Conduit Street regarding a 'half charge' scheme and auto charge control switch on car 58-GN.1st Dec 1930Box 163 \ 6  img080
The development of a dynamo and half-charge resistance scheme for the vehicle's electrical system.1st Dec 1930Box 163 \ 6  img081
The testing and implementation of high-output dynamos and auto-charge control switches on experimental cars.1st Dec 1930Box 163 \ 6  img082
Half charge scheme and the provision of a set of resistances for car 18-EX for R.1st Dec 1930Box 163 \ 6  img083
Internal request to order tabs for the Dynamo Resistance Unit on the 40-50 HP chassis.2nd Dec 1930Box 163 \ 6  img084
Performance of a dynamo-battery system and a two-rate charge switching scheme.9th Dec 1930Box 163 \ 6  img085
Dynamo output, field resistance, battery charging, and potential overheating issues.9th Dec 1930Box 163 \ 6  img086
Defining the standard conditions for comparing dynamo output curves, setting specific voltage and temperature parameters.9th Dec 1930Box 163 \ 6  img087
Continued discussion on dynamo output, battery charging schemes, and the prevention of overcharging.9th Dec 1930Box 163 \ 6  img088
Lengthened dynamo unit and discussing its performance curves.9th Dec 1930Box 163 \ 6  img089
Graph showing the output speed performance of a 48 coil 40/50 dynamo under three different conditions.26th Nov 1930Box 163 \ 6  img090
Graph showing the output speed performance curves for a 48 coil 40/50 dynamo at 80°C.26th Nov 1930Box 163 \ 6  img091
Graph of Dynamo RPM vs. Ampere Output under various test conditions.4th Dec 1930Box 163 \ 6  img092
Graph of output speed performance curves for a 20/25 Dynamo under various conditions.4th Dec 1930Box 163 \ 6  img093
Wiring diagram for a chassis electrical system incorporating two-rate charge switching.11th Dec 1930Box 163 \ 6  img094
Wiring diagram for the vehicle's electrical system, showing ignition and lighting circuits.11th Dec 1930Box 163 \ 6  img095
Proposal for a scheme to control dynamo output with optional full or half charge settings.11th Dec 1930Box 163 \ 6  img096
On a two-rate charge switching scheme and special switchbox for one-way interconnection.2nd Dec 1930Box 163 \ 6  img097
Continued report on the electrical system's dynamo charging and lighting switch interconnection.2nd Dec 1930Box 163 \ 6  img098
Performance characteristics of car dynamos and suggesting improvements.13th Dec 1930Box 163 \ 6  img099
Proceeding with the manufacture of dynamos using a half-charge scheme with a 6' resistance.16th Dec 1930Box 163 \ 6  img100
High output dynamos and the two-rate charge scheme.18th Dec 1930Box 163 \ 6  img101
Report discussing limitations and improvements for a dynamo and battery charging system.18th Dec 1930Box 163 \ 6  img102
Different half-charge schemes for the vehicle's dynamo and battery system.18th Dec 1930Box 163 \ 6  img103
Load and output requirements for a dynamo battery system, arguing against a proposed two-rate charge switching scheme.19th Dec 1930Box 163 \ 6  img104
Dynamo charging curves and concluding the current dynamo output is insufficient for present requirements.9th Dec 1930Box 163 \ 6  img105
Query and reply regarding a generator's cut-in speed in relation to a proposed switching modification.23th Dec 1930Box 163 \ 6  img106
Battery replacement and dynamo adjustment for car No.58-GN.22th Dec 1930Box 163 \ 6  img107
Design and implementation of a dynamo two-rate charging system for a car.23th Dec 1930Box 163 \ 6  img108
Internal memorandum discussing the design of a dynamo battery system and two-rate charge switching.24th Dec 1930Box 163 \ 6  img109
Dynamo output, battery charging limitations, and potential improvements.24th Dec 1930Box 163 \ 6  img110
Experimental work on dynamos, automatic charge cut-off, and improving output.24th Dec 1930Box 163 \ 6  img111
Performance issues and testing results for a two-rate dynamo charge scheme.31th Dec 1930Box 163 \ 6  img112
Instructions for altering a switchbox on chassis 58-GN, including a parts list and material considerations.1st Jan 1931Box 163 \ 6  img113
Technical memorandum discussing the dynamo output and two-rate charge scheme for various vehicles.3rd Jan 1931Box 163 \ 6  img114
Tests and proposed modifications for a dynamo's charging system and output.3rd Jan 1931Box 163 \ 6  img115
Continued memorandum discussing dynamo output, limitations, and potential improvements for vehicle electrical systems.3rd Jan 1931Box 163 \ 6  img116
Modifications and experiments for the Phantom II dynamo and two-rate charge scheme.1st Jan 1931Box 163 \ 6  img117
Alterations to the Phantom II dynamo and two-rate charge scheme, including battery performance and headlamp bulb wattage.1st Jan 1931Box 163 \ 6  img118
Issues with dynamo output, including falling current at high speeds and due to heat, and potential solutions.6th Jan 1931Box 163 \ 6  img119
Concluding that the 3rd brush scheme is inadequate and proposing a vibrator voltage controller for improved dynamo output.1st Jan 1931Box 163 \ 6  img120
Modifications to a car's electrical charging system and lighting, referred to as the 'Two Charge Scheme'.10th Jan 1931Box 163 \ 6  img121
Dynamo safety, headlamp bulbs and production charging schemes.1st Jan 1931Box 163 \ 6  img122
Request to supply two-rate charge resistances and change over all experimental cars to the 6' resistance.3rd Jan 1931Box 163 \ 6  img123
Modifications to a two-rate charge scheme for various car chassis.4th Jan 1931Box 163 \ 6  img124
Querying the specifications of a medium output dynamo and its production availability for a two-rate charge scheme on car 58-GN.16th Jan 1931Box 163 \ 6  img125
Modification order for four chassis under the 'Two Rate Charge Scheme'.19th Jan 1931Box 163 \ 6  img126
Dynamo output, a 'half charge scheme', and comparing it with a Lucas dynamo.20th Jan 1931Box 163 \ 6  img127
The dynamo output, a two-charge scheme, and the standardization of 48-watt headlamp bulbs.21th Jan 1931Box 163 \ 6  img128
Two-charge dynamo output scheme and clarifying previous correspondence.23th Jan 1931Box 163 \ 6  img129
Remark on a standardisation sheet for a Switchbox with a two-rate charge scheme.30th Jan 1931Box 163 \ 6  img130
Two-rate charge scheme and comparing output curves for different dynamo modifications.30th Jan 1931Box 163 \ 6  img131
Technical points on dynamos, armature reluctance, and headlamp bulb wattage.21th Jan 1931Box 163 \ 6  img132
The disadvantage of fitting more powerful light bulbs, specifically the increased rate of discharge.30th Jan 1931Box 163 \ 6  img133
Graph of output speed performance curves for a 48 coil medium output machine, plotting ampere output against dynamo RPM.31th Jan 1931Box 163 \ 6  img134
Implementation of a two-rate charge scheme and allocation of dynamos for experimental chassis.31th Jan 1931Box 163 \ 6  img135
Standardization of dynamos and two-rate charge schemes for the 20/25 chassis.4th Feb 1931Box 163 \ 6  img136
Proposal to modify dynamo poles on 25 HP T series cars instead of adopting a half-charge scheme.4th Feb 1931Box 163 \ 6  img137
Dynamo and die-cast Commutator End Bracket for the 20/25 HP Chassis.5th Feb 1931Box 163 \ 6  img138
Table of resistances and corresponding lengths for a two-rate charge scheme.7th Feb 1931Box 163 \ 6  img139


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