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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DescriptionDateIdentifier
Technical memo discussing schemes for fitting and modifying hydraulic shock dampers controlled from the driver's seat.24th Jun 1931Box 105 \ 3  scan0191
Customer complaints about shock damper noise and potential resolutions.7th Jul 1931Box 105 \ 3  scan0192
Modifications to poundage for front and rear hydraulic shock dampers on a 20/25 HP Chassis.25th Aug 1931Box 105 \ 3  scan0193
Clarifying the specifications for holes in high-pressure shock damper valves for different chassis models.2nd Sep 1931Box 105 \ 3  scan0194
Issue with road springs fouling the hydraulic damper casings on a 20/25 HP chassis.11th Sep 1931Box 105 \ 3  scan0195
Blueprints for rear hydraulic damper connecting tube parts for a 20/25 HP chassis.16th Sep 1931Box 105 \ 3  scan0196
Parts required for the front hydraulic damper connecting tubes on a 20/25 HP chassis.17th Sep 1931Box 105 \ 3  scan0197
Need for controllable shock absorbers, citing driving experiences and retailer feedback.24th Sep 1931Box 105 \ 3  scan0198
Necessity of replenishing pipes for hydraulic dampers based on experimental car data.9th Oct 1931Box 105 \ 3  scan0199
Test report on parts for 20/25 HP shock dampers, with load test results for springs and caps.29th Oct 1931Box 105 \ 3  scan0200
Chart of springs suitable for 25 HP dampers.1st Nov 1931Box 105 \ 3  scan0201
Graph plotting ball pin load against washer thickness for 20/25 HP split piston dampers.27th Oct 1931Box 105 \ 3  scan0202
Specifying damper loads for the 25 HP model, including front and rear settings and repair notes.2nd Nov 1931Box 105 \ 3  scan0203
Establishing a standard setting for shock absorbers for production.4th Nov 1931Box 105 \ 3  scan0204
Shock absorber noise on a 25 HP car and a proposal to test new split piston dampers.11th Nov 1931Box 105 \ 3  scan0205
Recommended shock damper load settings for various car models.5th Nov 1931Box 105 \ 3  scan0206
Valve holes and standard versus low rating springs for the Phantom II model.5th Nov 1931Box 105 \ 3  scan0207
Modifications to hydraulic shock absorbers to reduce knocking.11th Nov 1931Box 105 \ 3  scan0208
Drilling diagram for a main cylinder and end cover, common to the 20/25 HP and Phantom II models.12th Nov 1931Box 105 \ 3  scan0209
Oiling scheme for a link joint front axle damper.11th Nov 1931Box 105 \ 3  scan0210
Recommendations for damper loads and valve hole sizes for 25 HP low rating springs.12th Nov 1931Box 105 \ 3  scan0211
Depot sheet concerning the loads and adjustment of low rating spring shock absorbers for a 25 HP model.12th Nov 1931Box 105 \ 3  scan0212
Sending a set of split piston type dampers to Cricklewood to resolve noise complaints on a 25 HP chassis.13th Nov 1931Box 105 \ 3  scan0213
Correction memo regarding damper loads for 25 HP low rating springs.14th Nov 1931Box 105 \ 3  scan0214
Request to make 3 sets each of springs to Hs.469 A and B to increase the driving load in the 25 HP low inertia damper.8th Nov 1931Box 105 \ 3  scan0215
Specifications for a driving spring, detailing dimensions and two coil variations.9th Nov 1931Box 105 \ 3  scan0216
Covering memo for a report on tests concerning self-adjusting hydraulic shock absorbers.9th Nov 1931Box 105 \ 3  scan0217
Methodology for testing the movement of shock damper levers on different road types.9th Nov 1931Box 105 \ 3  scan0218
Data table showing performance test results for rear dampers under various loads, speeds, and road surfaces.19th Nov 1931Box 105 \ 3  scan0219
Dispatch of a schedule for the rear shock damper mounting, noting a delay due to work on the gearbox.19th Nov 1931Box 105 \ 3  scan0220
Instructions for alterations to the rear and front hydraulic shock dampers for the 20/25 HP chassis.26th Nov 1931Box 105 \ 3  scan0221
Shock damper loads and settings for 20/25 HP and 40/50 HP models.16th Dec 1931Box 105 \ 3  scan0222
Suspension and shock damper settings for the 20/25 HP, Phantom I, and Phantom II models.16th Dec 1931Box 105 \ 3  scan0223
On shock damper settings, modifications, and identification stamping.16th Dec 1931Box 105 \ 3  scan0224
Specification table for various front and rear suspension damper and spring configurations.6th Jan 1932Box 105 \ 3  scan0225
Complete set of Shock Dampers for the 25.HP. Chassis.6th Jan 1932Box 105 \ 3  scan0226
Transmittal memo for schemes related to J. 3. Shock Dampers.1st Jan 1932Box 105 \ 3  scan0227
The condition of shock dampers after a 10,000 miles trial.11th Jan 1932Box 105 \ 3  scan0228
Inspection report detailing defects found in front and rear dampers.11th Jan 1932Box 105 \ 3  scan0229
Inspection report on component wear, noting scoring on shafts, flaking on pads, and potential lubrication deficiencies.14th Jan 1932Box 105 \ 3  scan0230
The J. 3. Shock Damper (N.sch.3405) with distant control and its modifications.14th Jan 1932Box 105 \ 3  scan0231
Implementation of controllable shock dampers and a cabled response regarding production.3rd Mar 1932Box 105 \ 3  scan0232
Development strategy for controllable shock dampers, comparing different schemes for various car models.4th Mar 1932Box 105 \ 3  scan0233
Feasibility and design of driver-controlled versus automatic shock dampers.7th Mar 1932Box 105 \ 3  scan0234
And comparing several different schemes for a damper control system.7th Mar 1932Box 105 \ 3  scan0235
Magnetically controlled bypass valve for a shock damper system.7th Mar 1932Box 105 \ 3  scan0236
Page two of a report detailing the operation and testing of a solenoid-controlled valve system.3rd Mar 1932Box 105 \ 3  scan0237
Blueprint cross-section of a magnetically controlled leak shock damper as used on a test rig.3rd Mar 1932Box 105 \ 3  scan0238
Cross-section diagram of a magnetically controlled leak shock damper used on a test rig.3rd Mar 1932Box 105 \ 3  scan0239
Three graphs showing performance tests of a 'Magnetic Valve' under different leak and lift conditions.29th Aug 1932Box 105 \ 3  scan0240
Performance graphs for a 20HP rear damper with a magnetically controlled leak, tested at 4' and 1' ball pin strokes.7th Mar 1932Box 105 \ 3  scan0241
Decision between two schemes for controllable shock dampers.8th Mar 1932Box 105 \ 3  scan0242
Scheme 8416 for a vacuum-operated shock damper distant control system, including proposed improvements.9th Mar 1932Box 105 \ 3  scan0243
Request to manufacture a new hub for a damper using the old type 20 HP slipper wheels.10th May 1932Box 105 \ 3  scan0244
Blueprint of a hub for fitting a 20 HP damper.11th May 1932Box 105 \ 3  scan0245
Solutions for noisy axle dampers, including design suggestions with diagrams.11th May 1932Box 105 \ 3  scan0246
Challenges in developing and silencing J.III type shock absorbers.13th Jun 1932Box 105 \ 3  scan0247
Blueprint showing modifications to standard valves for noise tests on J III shock dampers.6th Jul 1932Box 105 \ 3  scan0248
Modification to shock absorber valves for the J.III type damper.6th Jul 1932Box 105 \ 3  scan0249
Blueprint showing a modification to a shock damper valve.14th Jun 1932Box 105 \ 3  scan0250
Blueprint for a J III Shock Damper Valve, of the Chamfered L.P. Extension Type.5th Jul 1932Box 105 \ 3  scan0251
Fouling of front shock dampers on a J.III chassis and subsequent load modification.7th Jul 1932Box 105 \ 3  scan0252
Tests, noise issues, and potential production problems with various shock damper valve designs.8th Jul 1932Box 105 \ 3  scan0253
Observation on damper fouling with a comparative list of various damper weights.1st Jul 1932Box 105 \ 3  scan0254
Summary of test results for a shock damper valve, detailing various modifications and performance outcomes.4th Jul 1932Box 105 \ 3  scan0255
Investigation into squawk and knock issues caused by air in the bearing feed and variations in oil pressure.4th Jul 1932Box 105 \ 3  scan0256
Blueprint drawings for various low pressure and damper valve types and tests.4th Jul 1932Box 105 \ 3  scan0257
Diagram illustrating the fouling points of the JII front shock dampers and anchorage brackets after road tests.7th Jul 1932Box 105 \ 3  scan0258
Blueprint comparing performance graphs for a JIII Rear Damper under various pressure, leak, and valve conditions.28th Jun 1932Box 105 \ 3  scan0259
Standardisation of hydraulic dampers with split type pistons for the chassis.7th Oct 1931Box 105 \ 3  scan0260
Introduction of a new part to a chassis, including associated costs.13th Jul 1932Box 105 \ 3  scan0261
Customer complaints and the high cost of hydraulic shock absorbers.13th Jul 1932Box 105 \ 3  scan0262
Modifications to road shock dampers for increased damping.14th Jul 1932Box 105 \ 3  scan0263
Technical memo discussing the testing and development of J.III type shock dampers.20th Jul 1932Box 105 \ 3  scan0264
Forwarding a request for information to another party to resolve production difficulties.20th Jul 1932Box 105 \ 3  scan0265
Four indicator diagrams for a J III rear cylinder, showing high and low pressure performance at various RPMs.19th Jul 1932Box 105 \ 3  scan0266
Modifications to the J.S. type shock damper piston to reduce manufacturing costs.19th Aug 1932Box 105 \ 3  scan0267
Requesting a critique on a new cost-reducing damper piston design for the J.3. type shock absorbers.22th Aug 1932Box 105 \ 3  scan0268
Material change to aluminium for J.3 type shock absorber cases and a specification for valves.25th Aug 1932Box 105 \ 3  scan0269
Technical memorandum regarding modifications and schemes for the J.III Hydraulic Damper.23th Sep 1932Box 105 \ 3  scan0270
Modifications for the Peregrine chassis and the development of automatic control.23th Sep 1932Box 105 \ 3  scan0271
Test results for a J.III Type Shock Damper's conical seated valve damping 'hat'.4th Oct 1932Box 105 \ 3  scan0272
Querying the standard setup for 25 HP hydraulic dampers on chassis with low rating springs.4th Oct 1932Box 105 \ 3  scan0273
Hydraulic damper and spring settings for the 20/25 HP model.6th Oct 1932Box 105 \ 3  scan0274
Instructions for adjusting low rating spring shock absorber loads for the 25 HP model by drilling holes in the valve.12th Nov 1931Box 105 \ 3  scan0275
Shock damper loads and settings for 20/25 HP and 40/50 HP models.16th Dec 1931Box 105 \ 3  scan0276
Guide on shock damper and spring settings for various models and driving conditions.18th Dec 1931Box 105 \ 3  scan0277
Shock damper settings, modifications, and identification stamping.15th Dec 1931Box 105 \ 3  scan0278
Specification table for various front and rear suspension spring types and associated valve settings.18th Oct 1932Box 105 \ 3  scan0279
Tests conducted on J.III type shock dampers using an N.S. 3497 conical seated valve.18th Oct 1932Box 105 \ 3  scan0280
Experiments on a damper system, focusing on pressure diagrams, hole sizes, and various air venting schemes.18th Oct 1932Box 105 \ 3  scan0281
Technical report on bearing lubrication modifications and Governor Control Scheme testing.18th Oct 1932Box 105 \ 3  scan0282
Analysis of loads, leakage, and pressure effects in a system with varying pipe diameters.18th Oct 1932Box 105 \ 3  scan0283
Test report page detailing performance results after cleaning a cylinder and testing a different valve spring.12th Sep 1932Box 105 \ 3  scan0284
Graphs showing performance of a conical seated valve under high and low pressure, with and without an oil groove to bearings.12th Sep 1932Box 105 \ 3  scan0285
Performance graphs for a J III rear conical seated valve under various pressure and seating conditions.16th Sep 1932Box 105 \ 3  scan0286
Four graphs showing performance data for a conical seated valve under various pressure and operational conditions.16th Sep 1932Box 105 \ 3  scan0287
Design change to the air vent on a J.III type damper.26th Oct 1932Box 105 \ 3  scan0288
Blueprint detailing a modification to add air vent grooves to a piston.26th Oct 1938Box 105 \ 3  scan0289
Requesting the creation of a brass prototype for a J.III type shock absorber diaphragm for testing.28th Oct 1932Box 105 \ 3  scan0290


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