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
Letter from Mechanics Universal Joint Company regarding drive shaft tube critical speed formulas.19th Oct 1931Box 105 \ 2  scan0125
Mathematical comparison and specification for a J.3. propeller shaft.5th Nov 1931Box 105 \ 2  scan0126
Propeller shaft and axle clearances for a 25HP chassis.6th Nov 1931Box 105 \ 2  scan0127
The decision to use a 3-inch propeller shaft on the J.3. model and the required modifications.6th Nov 1931Box 105 \ 2  scan0128
Standardisation of a 3.00' diameter propeller shaft to overcome periods and whirling.5th Jan 1932Box 105 \ 2  scan0129
Fitting of a new part to a chassis, including test date and associated costs.12th Mar 1932Box 105 \ 2  scan0130
Failing 20/25 Brake Servo, discussing material failures and potential remedies.5th Sep 1932Box 105 \ 2  scan0131
Providing preliminary figures on the end force exerted in the sliding splined joint of the propeller shaft.8th Sep 1932Box 105 \ 2  scan0132
Test graph plotting sliding effort against torque for a 20/25 HP propeller shaft spline.8th Sep 1932Box 105 \ 2  scan0133
Standardisation of parts document for needle bearings in propeller shaft joints.2nd Nov 1933Box 105 \ 2  scan0134
Standardisation of parts for needle bearing propeller shaft joints filled with Mobilgrease No. 2.8th Jan 1934Box 105 \ 2  scan0135
Request to produce two propeller shaft dampers and investigate modifications for fitting one to chassis 21-G-IV to address over-run gear rattles.20th Apr 1934Box 105 \ 2  scan0136
The rectification of gearbox rattles on chassis GEX.68, caused by excessive grease and end float.7th May 1934Box 105 \ 2  scan0137
Investigation of gearbox rattles on chassis GEX.68, which were resolved by reducing grease and end float.7th May 1934Box 105 \ 2  scan0138
Propeller shaft sliding joints and the effect of removing grease on transmission overrun rattles.10th May 1934Box 105 \ 2  scan0139
Recommendation for Vacuum Motor Grease No. 2 for 20/25 & 40/50 HP chassis universal joints with needle type bearings.30th May 1934Box 105 \ 2  scan0140
Note on the damping springs for the Propellor Shaft Damper on the 20/25 HP and Bentley chassis.8th Sep 1934Box 105 \ 2  scan0141
Standardisation of a propellor shaft damper to delete over-run rattle.7th Sep 1934Box 105 \ 2  scan0142
Cost estimate and production notes for a new damping feature on the Bentley 'G' series chassis.20th Sep 1934Box 105 \ 2  scan0143
The slip load for the propeller shaft damper on the 20/25 and Bentley chassis.16th Jan 1935Box 105 \ 2  scan0144
Requesting a note be added to the arrangement drawing for a 20/25 HP chassis propeller shaft damper.17th Jan 1935Box 105 \ 2  scan0145
Propeller shaft modifications for the 20/25 model, comparing performance to the Bentley.27th May 1935Box 105 \ 2  scan0146
Comparing propeller shaft specifications and performance for the 25/30 HP car.20th Dec 1935Box 105 \ 2  scan0147
The lack of propeller shaft vibration for the 25/30 HP car during a 10,000-mile test.24th Dec 1935Box 105 \ 2  scan0148
On the performance of a propeller shaft for the 25/30 HP car during a 10,000-mile test.24th Dec 1935Box 105 \ 2  scan0149
Notice regarding the retention of the propellor shaft damper on 20/25 HP models.17th Jan 1936Box 105 \ 2  scan0150
Road test report on the 25/30HP chassis detailing the propeller shaft hitting the crossmember on rebound.20th Apr 1936Box 105 \ 2  scan0151
Transmission vibration issues on the 25/30HP chassis and the proposed solution of fitting a propeller shaft damper.4th Aug 1936Box 105 \ 2  scan0152
Requesting the reintroduction of the propeller shaft damper for the 25/30 HP model.8th Apr 1936Box 105 \ 2  scan0153
Requesting to change the material of 20/25 Propeller shaft damper hubs to RR.53 to reduce weight.10th Nov 1936Box 105 \ 2  scan0154
Change in the manufacturing process for the 25/30.HP. Damper Flywheel to save costs.16th Nov 1936Box 105 \ 2  scan0155
Materials for the propeller shaft damper flywheels on the 25/30 HP chassis.20th Nov 1936Box 105 \ 2  scan0156
Specification document for the 25/30 Propeller Shaft, detailing its components and comparisons.2nd Apr 1937Box 105 \ 2  scan0157
Secret memo regarding piston stops, recommending they be filed below the surface and that the practice of counterboring the stop pin hole be discontinued to avoid leakage.23th Mar 1925Box 105 \ 2  scan0158
Secret memo sending a drawing for an India Piston.23th Mar 1925Box 105 \ 2  scan0159
Secret memo regarding a piston modification for the 'India' specification 20 HP engine.23th Mar 1925Box 105 \ 2  scan0160
Piston design, specifically scraper rings and pin sizes.31th Mar 1925Box 105 \ 2  scan0161
Design and materials for piston pins for various engines, proposing a spring ring device.28th Aug 1926Box 105 \ 2  scan0162
Standardisation of a piston with 5 narrow rings to replace the existing 3 narrow and 1 wide ring design.6th Apr 1927Box 105 \ 2  scan0163
Standardisation of chassis parts form detailing the first chassis for a new part, test date, and tooling costs.8th Oct 1927Box 105 \ 2  scan0164
Instructions for modifying the gudgeon pin fitment on 20 HP engine pistons to prevent distortion.30th Aug 1927Box 105 \ 2  scan0165
Design changes and die-casting methods for cross web pistons for the 20 HP engine.22th Dec 1927Box 105 \ 2  scan0166
Providing drawings for piston components for the 'India' project and instructions for assembly.11th Jan 1928Box 105 \ 2  scan0167
Trialling die-cast car pistons made from Halls alloy for 20 HP and 40/50 models.1st Feb 1928Box 105 \ 2  scan0168
Proposal to trial rectangular piston rings on the 20HP engine to address overoiling issues.27th Feb 1928Box 105 \ 2  scan0169
Recommending the use of hardened and spring tempered high duty alloy steel over case-hardened steel for piston pins.15th Mar 1928Box 105 \ 2  scan0170
The material of piston pins and a request for further fatigue tests.4th Jul 1928Box 105 \ 2  scan0171
Strengthening modifications for the 20 HP piston, including a special taller version for 'India 3'.14th Jul 1928Box 105 \ 2  scan0172
Confirmation of a wire communication regarding 'Twenty' piston issues, with instructions to scrap and replace with a strengthened design.16th Jul 1928Box 105 \ 2  scan0173
Relaying the contents of a telegram from Royce concerning dangerous Phantom pistons.17th Jul 1928Box 105 \ 2  scan0174
Piston breakage on a 20 HP chassis and proposing design modifications for rings and piston strengthening.7th Jul 1928Box 105 \ 2  scan0175
Failed piston and scraper ring design for the 20 HP car.19th Jul 1923Box 105 \ 2  scan0176
A broken 20 HP piston from an experimental car being sent for inspection.19th Jul 1928Box 105 \ 2  scan0177
New and experimental piston designs for the 20 HP and Phantom models.20th Jul 1928Box 105 \ 2  scan0178
Changing from 'L' shaped to plain rectangular piston rings for the 20 HP chassis.20th Jul 1928Box 105 \ 2  scan0179
Confirmation of a telegram discussing piston ring solutions for the Twenty HP and Phantom models.23th Jul 1928Box 105 \ 2  scan0180
Pedestal piston design for 'India 3', featuring an Invara steel control ring to prevent piston slap.24th Jul 1928Box 105 \ 2  scan0181
Fitting and testing of pistons and rings for 20 HP and Phantom engines.1st Jul 1928Box 105 \ 2  scan0182
Performance and design of piston rings, including the phasing out of 'L' shaped rings.20th Aug 1928Box 105 \ 2  scan0183
Decision to switch from 'L' shape to plain square section piston rings for 20 HP engines.27th Aug 1929Box 105 \ 2  scan0184
The addition of oil holes to the gudgeon pin bosses of 20HP pistons.4th Sep 1928Box 105 \ 2  scan0185
Car modifications addressing issues with slipper drive, engine mounts, pistons, and suspension shudder.4th Sep 1928Box 105 \ 2  scan0186
Immediate modification instruction for 20 HP pistons concerning oil flow around the gudgeon pin.5th Sep 1928Box 105 \ 2  scan0187
Gas-tightness of 4-pinned rings on 20 HP pistons.19th Sep 1928Box 105 \ 2  scan0188
Valve lubrication issues on engine 12-G-4 causing unreliability at slow speeds.16th Oct 1928Box 105 \ 2  scan0189
Design and specifications of pistons and piston rings.18th Oct 1928Box 105 \ 2  scan0190
Desired features and dimensions for Phantom and 20 HP pistons.25th Jan 1929Box 105 \ 2  scan0191
Issue of pistons seizing on new 40/50 and 20 HP cars.25th Jan 1929Box 105 \ 2  scan0192
Secret internal memorandum discussing potential engine modifications to improve 20 HP car performance.15th Apr 1929Box 105 \ 2  scan0193
Calculations comparing engine performance based on increased capacity, weight savings, and a lower axle ratio.8th Apr 1929Box 105 \ 2  scan0194
Proposed alterations to cylinder studs for a larger 3.200' bore engine, including stress analysis.8th Apr 1929Box 105 \ 2  scan0195
Proposed alterations to cylinder studs for a larger 3.250' bore engine.18th Apr 1929Box 105 \ 2  scan0196
Reporting on the improved performance of a 20 HP chassis fitted with 3.200 diameter pistons.23th Apr 1929Box 105 \ 2  scan0197
Design of piston pin retaining circlips for 'China' chassis.4th May 1929Box 105 \ 2  scan0198
Confirmation of a wire message with instructions on fitting a turbulent head to a sixteen-G-four engine.29th May 1929Box 105 \ 2  scan0199
Inquiring about the production and testing status of various car piston models.17th Sep 1929Box 105 \ 2  scan0200
Progress update on 'CHINA' pistons and subsequent handwritten annotations.30th Sep 1929Box 105 \ 2  scan0201
Summary of car piston designs and their technical features.4th Oct 1929Box 105 \ 2  scan0202
Piston and ring specifications for 20 HP engines with 3.000' and 3.250' bores.16th Jul 1928Box 105 \ 2  scan0203
Confirming the resolution of an over-oiling issue with Goshawk Pistons.12th Oct 1929Box 105 \ 2  scan0204
Trial of 'Perfect Circle' type piston rings on the 'China' engine to address over-oiling issues.31th Dec 1929Box 105 \ 2  scan0205
Instructions regarding an experiment to replace a piston and fit a channelled scraper ring to a 20HP Chassis.16th Jan 1930Box 105 \ 2  scan0206
Requesting the modification of 20 HP piston drawings to use Perfect Circle type piston rings.21th Jan 1930Box 105 \ 2  scan0207
Requesting modifications to a 20 HP engine to achieve variable compression ratios for testing.18th Mar 1930Box 105 \ 2  scan0208
The successful testing and production of pistons in R.R.53 material for Phantom II and 20/25 HP models, requesting a standardisation sheet.2nd Sep 1930Box 105 \ 2  scan0209
Out-of-date practices on piston ring clearances for the 25 HP engine.27th Nov 1931Box 105 \ 2  scan0210
Standardisation of chassis parts, specifically pistons with a 5.75 to 1 compression ratio.4th Jan 1932Box 105 \ 2  scan0211
Introduction of a new part to a chassis, including costs and test dates.12th Mar 1932Box 105 \ 2  scan0212
Practice of pinning piston rings in aero and car engines.24th May 1932Box 105 \ 2  scan0213
Tests carried out on pistons to determine stiffness and sustained load.1st May 1933Box 105 \ 2  scan0214
Load tests performed on a 20/25 piston skirt to determine its failure point.21th Apr 1933Box 105 \ 2  scan0215
Series of graphs and tables detailing the results of piston skirt pressure tests.8th Aug 1932Box 105 \ 2  scan0216
Graph showing the results of deflection and permanent set tests on a 20/25 HP piston skirt under increasing load.21th Apr 1933Box 105 \ 2  scan0217
Limitations of spring skirt chassis pistons and proposing new test designs.11th May 1933Box 105 \ 2  scan0218
Requesting the manufacture of one set of pistons for Bentley & 20/25 models.26th Sep 1934Box 105 \ 2  scan0219
25-29 HP split skirt piston for a large bore engine.10th Oct 1935Box 105 \ 2  scan0220
The discontinuation of semi-split type pistons and their associated grinding tackle.12th Oct 1934Box 105 \ 2  scan0221
Recommendation to standardize the longer skirt Bentley piston on the 20/25 HP model.13th Nov 1934Box 105 \ 2  scan0222
Use of Bentley long skirt type pistons on the 20/25 HP chassis.19th Nov 1934Box 105 \ 2  scan0223
The scrapping of 20/25 pistons and a suggestion to await results from a 10,000-mile test run.21th Nov 1934Box 105 \ 2  scan0224


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