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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The specifications and adjustments for a 20 HP Dynamo.8th Apr 1927Box 165 \ 6  img078
Chassis 10-GIII after a 10,000-mile test in France, detailing dynamo performance.10th May 1927Box 165 \ 6  img079
Feasibility of using 57 grooves in a car dynamo's armature.16th May 1927Box 165 \ 6  img080
Instruction for swapping a dynamo and armature between different chassis.26th May 1927Box 165 \ 6  img081
Extract discussing the experimental status of N.B. machines and the testing of 28-slot armatures for 20 HP dynamos.4th Jun 1927Box 165 \ 6  img082
Proposal regarding brush spring pressures for the 20 HP chassis, suggesting standardization of parts for production convenience.11th Apr 1927Box 165 \ 6  img083
Use of a common spring for intermediate poundage on main and control brushes.1st Jun 1927Box 165 \ 6  img084
Standardisation of a 20 HP Dynamo 28 slot armature to improve running silence.28th May 1927Box 165 \ 6  img085
Standardisation document for chassis parts detailing the testing and costs of a new part.8th Oct 1927Box 165 \ 6  img086
Standardisation of the 28 slot armature for the 20 HP dynamo.21th Jun 1927Box 165 \ 6  img087
Letter from Le Carbone providing characteristics for dynamo brushes of grade 'EG3417' for comparison.27th Jun 1927Box 165 \ 6  img088
Comparison of physical properties for material grades 'Z' and 'EG3417'.27th Jun 1927Box 165 \ 6  img089
Inspection report on a 20hp 28-slot dynamo after 12,000 miles of use in France.11th Jul 1927Box 165 \ 6  img090
Inspection report on an over-lubricated machine, detailing the condition of its brushes and commutator.29th Sep 1930Box 165 \ 6  img091
Instruction sheet noting a drop in dynamo output amperage and a loose field terminal.12th Aug 1927Box 165 \ 6  img092
Production check for a 20 HP machine with a new 28 slot armature.12th Aug 1927Box 165 \ 6  img093
Comparative tests of dynamo brushes for a 20 HP dynamo.18th Aug 1927Box 165 \ 6  img094
Test report comparing the wear and performance of various brush grades, with detailed measurements.18th Aug 1927Box 165 \ 6  img095
Report comparing the performance and characteristics of two different dynamo brush grades, 'Z' and 'G3417'.18th Aug 1927Box 165 \ 6  img096
The performance, wear, and noise of various brush grades compared to standard and continental types.18th Aug 1927Box 165 \ 6  img097
Continued report on the standardisation of the 40/50 dynamo and associated brush tests.18th Aug 1927Box 165 \ 6  img098
Clarifying the production inspection and test specifications for a 20 HP Dynamo with a 28 slot armature.30th Aug 1927Box 165 \ 6  img099
On the examination of a 20 HP Production Dynamo F.9V, noting an issue with the magneto drive cover.6th Sep 1927Box 165 \ 6  img100
Requesting experimental tests on a 28 slot armature for a 20 HP dynamo without central banding.1st Sep 1927Box 165 \ 6  img101
Instructions and test results for a 30 hp Dynamo with a 28 Slot Armature.16th Sep 1927Box 165 \ 6  img102
Instructions detailing the testing of various dynamo armatures to evaluate performance and noise levels.29th Jun 1920Box 165 \ 6  img103
Experimental tests of a dynamo armature and main brush retard settings.11th Jul 1927Box 165 \ 6  img104
Report detailing temperature and performance test results for various machines.29th Aug 1920Box 165 \ 6  img105
Batch of 25 machines, comparing their commutation to a 29 slot 57 segment type.29th Jun 1920Box 165 \ 6  img106
Performance graph showing the output curves for a 20 HP dynamo.14th Apr 1927Box 165 \ 6  img107
Blueprint graph showing the output curve of a 20 HP Dynamo.16th Sep 1927Box 165 \ 6  img108
The standardization and testing of 28 slot armatures for 20 HP and 40/50 HP dynamos to resolve noise issues.1st Nov 1927Box 165 \ 6  img109
Continued report on experimental N.B. machines, discussing the curing of noise trouble and improvements in heating.31th Dec 1927Box 165 \ 6  img110
Instructions and test results for a 28 Slot Dynamo on General Specification.31th Dec 1927Box 165 \ 6  img111
Comparing the performance and weight of a 38-slot machine against an old standard 57-segment machine.29th Jun 1920Box 165 \ 6  img112
Standardisation of solid pole pieces for the 20 HP dynamo to reduce production costs.14th Dec 1926Box 165 \ 6  img113
Implementation of two standardisation sheets regarding dynamo pole pieces and battery box holding for the 20 HP chassis.14th Jan 1927Box 165 \ 6  img114
The investigation of noisy 20 HP dynamos and the proposal to renew their bearings to reduce noise.19th Jan 1927Box 165 \ 6  img115
Delay in borrowing dynamos from the Test Department for checking machines with pole modifications.28th Jan 1927Box 165 \ 6  img116
Delay of 20 HP dynamo noise tests pending the return of specific dynamos.2nd Feb 1927Box 165 \ 6  img117
Test report on a P.2.KM. dynamo with a single modification, detailing necessary adjustments to the control brush angle for production.2nd Feb 1927Box 165 \ 6  img118
Addendum regarding a modification to the control brush angle of a P.2.M. Dynamo.2nd Feb 1927Box 165 \ 6  img119
Circulating inspection sheets for a faulty 20 HP Dynamo.17th Feb 1927Box 165 \ 6  img120
Inspection instructions for a 20 HP dynamo, focusing on faulty output and commutation.14th Feb 1927Box 165 \ 6  img121
On modifying a 20HP dynamo's brush position to correct its output curve.2nd Jun 1926Box 165 \ 6  img122
The rejection of a modified 20 HP dynamo due to noise and output curve issues.8th Mar 1927Box 165 \ 6  img123
Re-testing results of a 20 HP dynamo with pole modification and issues with noisy machines.17th Mar 1927Box 165 \ 6  img124
Production testing and performance of a 20 HP Dynamo with pole modifications.21th Mar 1927Box 165 \ 6  img125
Finding a solution for noisy dynamos by experimenting with a new armature design.22th Mar 1927Box 165 \ 6  img126
Investigation into noisy 30 HP dynamos rejected by the Repair Department after overhaul.22th Mar 1927Box 165 \ 6  img127
Investigations into armature hum, comparing 57 coil, 29 coil, and 28 slot armatures.29th Jun 1920Box 165 \ 6  img128
Inspection notes on the performance of armatures after fitting new bearings.29th Jun 1920Box 165 \ 6  img129
Instruction sheet detailing an investigation into a humming noise in a machine by testing different armatures and bearings.29th Jun 1920Box 165 \ 6  img130
Investigating noise characteristics in machines, referencing static drag and armature design.29th Jun 1920Box 165 \ 6  img131
Investigating a humming noise in a machine, considering slack bearings and component accuracy as potential causes.29th Jun 1920Box 165 \ 6  img132
Instruction sheet detailing an investigation into machine noise and proposing modifications to armature slots and pole edges.29th Jun 1926Box 165 \ 6  img133
Modification to a 20 HP dynamo to reduce noise by altering its pole pieces.24th Mar 1927Box 165 \ 6  img134
Clarifying a misunderstanding about the noise levels of a modified 20-HP Dynamo P.6. KM.25th Mar 1927Box 165 \ 6  img135
Modifications and testing of noisy 20 HP and 40/50 HP dynamos.25th Mar 1927Box 165 \ 6  img136
Production of tools, armatures, and dynamos for 20 HP and 40/50 HP models.25th Mar 1927Box 165 \ 6  img137
From the Test Department regarding the receipt of three modified dynamos.29th Mar 1927Box 165 \ 6  img138
Performance variations, modifications, and testing for 20 HP and 40/50 HP dynamos.29th Mar 1927Box 165 \ 6  img139
Continuation sheet regarding the confirmation of the silence quality of armatures.30th Mar 1927Box 165 \ 6  img140
The examination and testing of a 20 HP Production Dynamo A3Z, noting a minor deviation in commutator settings.30th Mar 1927Box 165 \ 6  img141
Performance issues and test results of a modified 20 HP dynamo.5th Apr 1927Box 165 \ 6  img142
Chasing the return of a modified L.70 dynamo for pole piece staggering.12th Apr 1927Box 165 \ 6  img143
Diagrammatic wiring views for 20 HP and 40/50 HP dynamos from the commutator end.23th May 1927Box 165 \ 6  img144
Requesting to fit a standard 20 HP dynamo with special Le Carbone brushes to chassis 11-G3.23th Apr 1927Box 165 \ 6  img145
Change to the monthly dynamo production programme.24th May 1927Box 165 \ 6  img146
Chassis dynamo test where temperature sentinels melted, indicating a high operating temperature during a 10,000-mile trial.26th May 1927Box 165 \ 6  img147
Standardisation table for motors and dynamos, specifying the use of solid poles versus punched plates.27th May 1927Box 165 \ 6  img148
Graph showing the output curve and requirements for a 20 HP Dynamo.1st Oct 1929Box 165 \ 6  img149
Testing a 20HP dynamo, suggesting a slight advance of the control brush to reduce high output.30th May 1927Box 165 \ 6  img150
Modifications to address noise issues in 20 HP and 40/50 HP dynamos.30th May 1927Box 165 \ 6  img151
Number of production dynamos received and modified during a specific week.30th May 1927Box 165 \ 6  img152
Proposal to modify a 20 HP dynamo armature with steel wedges to reduce noise.9th Jun 1927Box 165 \ 6  img153
To Mr. Brock from EFC regarding the status of a monthly production Dynamo FV.95.27th Jun 1927Box 165 \ 6  img154
Performance comparison of dynamos on single modification 20 HP machines.1st Apr 1927Box 165 \ 6  img155
Performance comparison table of dynamos for single modification 20 HP machines.1st Apr 1927Box 165 \ 6  img156
Performance comparison log for dynamos on 20 HP machines.1st Apr 1927Box 165 \ 6  img157
Dynamo output and voltage performance graph for a 20 HP model.11th Feb 1925Box 165 \ 6  img158
Instructions regarding the testing and performance of 87° and 97° sentinels on a 20 hp dynamo.31th Oct 1927Box 165 \ 6  img159
The performance and failure of dynamo sentinel components over various distances.29th Jun 1920Box 165 \ 6  img160
Instructions on the temperature performance and safety of a 97°C sentinel on a 30hp machine.20th Jun 1920Box 165 \ 6  img161
Use and performance of fusible sentinels on 20 HP and 40/50 HP dynamos.10th Nov 1927Box 165 \ 6  img162
Experimental record sheet for 20hp Dynamo temperature sentinels.22th Oct 1927Box 165 \ 6  img163
Test data and remarks for a 20 HP Dynamo, model 931, with EJB poles.18th Apr 1928Box 165 \ 6  img164
Letter discussing modifications to dynamo and switch schemes, and a 10,000-mile test.17th Mar 1928Box 165 \ 6  img165
Implementation of a 'green lamp scheme' versus an 'auto switch' system.2nd Mar 1928Box 165 \ 6  img166
Diagrammatic wiring views of dynamos for 20 HP and 40/50 HP engines from the commutator end.2nd Mar 1928Box 165 \ 6  img167
Instruction sheet for the return of a GII Dynamo for a monthly test.22th Mar 1928Box 165 \ 6  img168
Production inspection report for a 20 HP Dynamo C.4.Z, detailing an issue with brush clearance.30th Mar 1928Box 165 \ 6  img169
Reporting on the examination of a 20 HP Monthly Production Dynamo X9F, noting a tight bearing causing stiffness.26th May 1928Box 165 \ 6  img170
Test report on the performance of dynamo brushes after 10,000 miles of road use.6th Jun 1928Box 165 \ 6  img171
Faulty 20 HP dynamo carcase with incorrectly sized pole pieces.11th Jun 1928Box 165 \ 6  img172
Defective 20 HP dynamo bearing causing a rattle and a request for its replacement.16th Jun 1928Box 165 \ 6  img173
To Mr. Brock regarding the expectation of receiving a 20 HP production dynamo for a monthly test.18th Sep 1928Box 165 \ 6  img174
10,000-mile test of dynamo brushes for a 20 HP vehicle.14th Sep 1928Box 165 \ 6  img175
Test report on the performance and wear of brushes compared to standard grades.8th Dec 1924Box 165 \ 6  img176
List of various grades of brushes for testing, including standard narrow and 20 HP twin types.19th Sep 1928Box 165 \ 6  img177


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