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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Reallocation of a stock car chassis due to delays and holding experimental parts.17th Nov 1932Box 163 \ 6  img240
Alterations to a faulty switchbox lock on chassis GAU-14.17th Nov 1932Box 163 \ 6  img241
Reassigning an experimental three-charge dynamo scheme from chassis GHW-58 to GAW-3.22th Nov 1932Box 163 \ 6  img242
Arranging the urgent fitting of a new switchbox and thermostat springs to a car.22th Nov 1932Box 163 \ 6  img243
Telegram confirmation regarding holding car GAU-14 for the fitting of a switchbox and thermostat spring.22th Nov 1932Box 163 \ 6  img244
Work required on chassis GAU-14 during its sales trials, including electrical and mechanical adjustments.23th Nov 1932Box 163 \ 6  img245
Confirming the average control brush angle for D.SCH.529 dynamos.24th Nov 1932Box 163 \ 6  img246
The fitting of an experimental three-charge dynamo scheme to chassis GAW.3.30th Nov 1932Box 163 \ 6  img247
Letter from a battery supplier regarding issues with batteries running down on 25 HP cars.19th Dec 1932Box 163 \ 6  img248
Query regarding the new type three-charge box fitted to cars GAU-14 and GHW-76 and its intended use on other vehicles.21th Dec 1932Box 163 \ 6  img249
The status of the 20/25 three-rate charge scheme on various experimental car chassis.22th Dec 1932Box 163 \ 6  img250
Letter to the National Accumulator Co. Ltd regarding battery charging issues and dynamo field resistance on the 20/25 HP chassis.29th Dec 1932Box 163 \ 6  img251
Notice about the dangerous practice of short-circuiting the dynamo field resistance on the 20/25 chassis.29th Dec 1932Box 163 \ 6  img252
Complaints of inadequate daytime charging rates for the 20/25 HP chassis.31th Dec 1932Box 163 \ 6  img253
The 'Half-Charge Scheme' on 20/25 HP models, detailing the risks of modifying the dynamo field resistance.3rd Jan 1933Box 163 \ 6  img254
Standardization of field resistance for the half-charge scheme on 25 HP models.4th Jan 1933Box 163 \ 6  img255
Production test specifications for the 20/25 three-rate charge scheme.6th Jan 1933Box 163 \ 6  img256
Specification for production inspection and testing of a 20/25 HP Dynamo.2nd Feb 1933Box 163 \ 6  img257
Procedure for running and insulation tests on a dynamo, including bedding of brushes.2nd Feb 1933Box 163 \ 6  img258
Production inspection, adjustment, and testing specification for the distribution box and cutout.2nd Feb 1933Box 163 \ 6  img259
Test procedures for a dynamo and distribution box, detailing cold operation and charging current tests.2nd Feb 1933Box 163 \ 6  img260
Procedure for testing the dynamo speed and cutout contacts based on ammeter readings.12th Jan 1933Box 163 \ 6  img261
Production test for a standard two-charge 20/25 dynamo using a smaller field resistance unit.12th Jan 1933Box 163 \ 6  img262
Requesting a reply regarding the three charge scheme on trials chassis GAW-3, with a handwritten response.26th Jan 1933Box 163 \ 6  img263
Confirming a change in resistance for the three-rate charge system on the 20/25 HP Chassis.31th Jan 1933Box 163 \ 6  img264
Test report on the dynamo charging system for Chassis No. GAW 3.3rd Feb 1933Box 163 \ 6  img265
Requesting a resoldered armature for a standard 20/25 three-rate charge dynamo.8th Feb 1933Box 163 \ 6  img266
Request for speedometer readings and dynamo performance feedback for chassis GLN-60.15th Feb 1933Box 163 \ 6  img267
Dynamo performance and three-rate charge scheme on chassis GLN-60.20th Feb 1933Box 163 \ 6  img268
Attaching the production specification for a new field resistance unit for the Standard 20/25 Three Rate Charge Dynamo.23th Feb 1933Box 163 \ 6  img269
Production inspection and test specification for a 20/25 dynamo field resistance unit.23th Feb 1933Box 163 \ 6  img270
Page from a test procedure detailing electrical and physical inspection steps.27th Feb 1933Box 163 \ 6  img271
Request for performance curves of the 'Phantom' and 20/25 HP dynamos under different conditions.27th Feb 1933Box 163 \ 6  img272
Production specification of inspection and test for a new switchbox in connection with the Standard 20/25 Three Rate Charge Scheme.28th Feb 1933Box 163 \ 6  img273
Specification of test for the 20/25 Switchbox.28th Feb 1933Box 163 \ 6  img274
Page of instructions for testing an electrical lighting circuit.15th Mar 1933Box 163 \ 6  img275
Alteration to the control brush position on a Three Rate Charge Dynamo for a 20/25 HP Chassis.15th Mar 1933Box 163 \ 6  img276
Control brush setting for a 20/25HP chassis three-rate charge dynamo.17th Mar 1933Box 163 \ 6  img277
Standardisation of a dynamo, switchbox, and distribution board for a three-charge scheme.29th Nov 1932Box 163 \ 6  img278
Form for the standardisation of a chassis part, including fitting details, costs, and an approval log.12th Nov 1932Box 163 \ 6  img279
The three-rate charge system and dynamo output curves for the standard 20/25 chassis, starting with the X series.4th May 1933Box 163 \ 6  img280
Performance graph plotting dynamo ampere output against dynamo speed and chassis M.P.H.4th May 1933Box 163 \ 6  img281
Graph of Dynamo output curves for a 3-rate charge scheme.4th May 1933Box 163 \ 6  img282
Draft leaflet for the 20/25 Chassis Handbook No. XIV, specifically about the three-charge rate scheme.16th Jun 1933Box 163 \ 6  img283
Insert for the 20/25 HP Chassis Handbook detailing a revised wiring diagram and switchbox modifications.16th Jun 1933Box 163 \ 6  img284
Description of the conditions for achieving maximum, normal/Winter, and reduced/Summer electrical charging rates.19th Jun 1933Box 163 \ 6  img285
Review of a leaflet for the 20/25 Chassis Handbook No. XIV regarding the three-rate charge scheme and wiring diagram.19th Jun 1933Box 163 \ 6  img286
Order for a Zenite resistance unit.9th Jan 1934Box 163 \ 6  img287
Request to manufacture six Ballast Resistances for the 'Spectre' project.20th Feb 1934Box 163 \ 6  img288
Order for 'Zenito' Resistances for Kestrel Flexible Dynamo Test on Aero Engine Test Beds.1st Apr 1934Box 163 \ 6  img289
The purchase of two dynamo load variable resistances.11th Jan 1935Box 163 \ 6  img290
Dynamo field resistances and proposed modifications for production machines.26th Feb 1935Box 163 \ 6  img291
Request to order Ferranti wire wound resistances with holders.5th Mar 1935Box 163 \ 6  img292
Request to order control resistances and tumbler switches for an oscilloscope motor overhaul.18th Apr 1935Box 163 \ 6  img293
Internal request to order 48 suppressors from the Erie Resistor Co.21th May 1935Box 163 \ 6  img294
Requesting an order for six 5,000 ohms wire-wound inductive resistance components from Standard Telephones & Cables, Ltd.5th Nov 1935Box 163 \ 6  img295
Failure of a Ferranti Special Resistance on test and its return for replacement.21th Dec 1936Box 163 \ 6  img296
Request to obtain a non-inductive resistance unit for aero ignition coil shunt resistance tests.22th Nov 1935Box 163 \ 6  img297
Request from D. Napier & Son for particulars on ignition chokes for experimentation following an S.B.A.C. meeting.13th Jan 1936Box 163 \ 6  img298
Letter from The Zenith Electric Co. Ltd. regarding a resistance unit that did not meet specifications.14th Jan 1936Box 163 \ 6  img299
Letter from The Zenith Electric Company Limited regarding the supply and design of resistances.15th Jan 1936Box 163 \ 6  img300
Letter to D. Napier & Son Ltd. regarding the dispatch of two 10,000 Ohm ignition resistance units.15th Jan 1936Box 163 \ 6  img301
Specification for a non-temperature coefficient ballast resistance for two types of coils.5th Feb 1937Box 163 \ 6  img302
Request to return a Zenith variable resistance for repair after it was burnt out during tests.5th Feb 1937Box 163 \ 6  img303
Instruction to produce six 'Glowray' Ballast resistance units as per drawing DW.296.28th Jun 1937Box 163 \ 6  img304
Invoice from Joseph Lucas Ltd for a VCMA-2 Unit and requesting instructions for payment.5th Nov 1937Box 163 \ 6  img305
Invoice from Joseph Lucas Ltd. for a VCMA-2 sample unit and a request for a covering order.26th Nov 1937Box 163 \ 6  img306
Request to arrange a covering order for a VCMA-2 unit obtained from Lucas as a sample.30th Nov 1937Box 163 \ 6  img307
Order for a VCMA-2 unit from Joseph Lucas Ltd., referencing a previous memo and invoice.1st Dec 1937Box 163 \ 6  img308
Request to obtain a catalogue for toroidal wound potentiometers and resistances.6th Nov 1940Box 163 \ 6  img309
Differences in behaviour between RR and Remy battery ignition contact points, suspecting mechanical stiffness as the cause.6th Jan 1927Box 163 \ 7  img001
Potential use of a Delco ignition system as a replacement for magnetos on an aero engine.13th Apr 1918Box 163 \ 7  img002
Letter concerning the temporary fitment and testing of Delco ignition systems on the Rolls-Royce Eagle engine.23th Sep 1918Box 163 \ 7  img003
Liberty engines, discussing service issues with magnetos, battery ignition, and the development of components like starting switches and voltage regulators.23th Sep 1918Box 163 \ 7  img004
Letter discussing production delays, parts shipments, and communication with Dayton Engineering Laboratories regarding ignition tests on an aviation engine.23th Sep 1918Box 163 \ 7  img005
Trouble with an ignition system fitted to an Allied 12-cylinder engine and details for contacting the Delco Chief Engineer.30th May 1918Box 163 \ 7  img006
Modifications and performance of a battery ignition distributor.30th May 1918Box 163 \ 7  img007
Delco battery ignition systems for aero engines, covering experiments, benefits, and starting procedures.30th May 1918Box 163 \ 7  img008
The dangers of hand-starting 4-bladed propellers and advocating for the safer switch-start method.30th May 1918Box 163 \ 7  img009
Improvements to a battery ignition system, including a cure for back-firing, and comparing it with a Remy ignition.30th May 1918Box 163 \ 7  img010
Letter discussing descriptive sheets and technical details for the Delco Ignition system.2nd Oct 1918Box 163 \ 7  img011
Receipt of Delco Ignition Gear Sets from America and their dispatch to the Experimental Department.4th Nov 1918Box 163 \ 7  img012
On the U.S.A. Bosch Battery Ignition system, its materials, and a note on Delco's supply conditions.24th Feb 1921Box 163 \ 7  img013
List of questions for Mr. Royce regarding issues with battery ignition systems and comparisons to competitors.3rd Mar 1921Box 163 \ 7  img014
Material used for Delco distributor tracks, clarifying a switch from Bakelite to hard rubber.9th Apr 1921Box 163 \ 7  img015
State of electrical accessories, comparing Delco to American Bosch, and considering in-house manufacturing.9th Apr 1921Box 163 \ 7  img016
Pre-ignition issues caused by mutual induction between the battery and magneto ignition systems.11th Apr 1921Box 163 \ 7  img017
Request for copies of any reports written by Mr. Royce regarding the Delco Ignition System.28th Apr 1921Box 163 \ 7  img018
Responding to a request for information on Delco Ignition systems.4th May 1921Box 163 \ 7  img019
Letter discussing the sourcing of dynamos from America and the decision to move away from vibrator regulators.9th Apr 1921Box 163 \ 7  img020
The disappointing supply of dynamos and a recommendation to use the Delco company for electrical equipment.4th May 1921Box 163 \ 7  img021
Internal query regarding the capacity and construction of a Delco Packard condenser for the Goshawk II engine.30th May 1921Box 163 \ 7  img022
Persistent faults found in the electrical equipment of the 40/50 chassis.7th Jun 1921Box 163 \ 7  img023
Report comparing the reliability of Delco electrical equipment on a Marmon car with other systems over 5000 miles.7th Jun 1921Box 163 \ 7  img024
Production delays and quality control, proposing to scrap parts to avoid sending out cars with known faults.1st Jun 1921Box 163 \ 7  img025
From Mr. Olley discussing Mr. Royce's reports on ignition systems and the quality of American electrical equipment.1st Jun 1921Box 163 \ 7  img026
The performance and issues with Delco battery ignition systems, referencing correspondence with Mr. Royce.19th May 1921Box 163 \ 7  img027
Reliability of Delco electrical equipment and proposing a direct-driven generator for the 40/50 chassis.1st Jun 1921Box 163 \ 7  img028
Examination of a Delco Packard ignition condenser removed from a Packard car.18th Jun 1921Box 163 \ 7  img029
Continued memorandum on condenser construction, capacity, and leakage.16th Jun 1921Box 163 \ 7  img030


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