| Description | Date | Identifier | |
| Goshawk exhaust noise issues, particularly 'booming' sounds in relation to different coachbuilt bodies. | 28th Nov 1922 | Box 48 \ 4 Scan182 | |
| Investigation into a severe 'booming' noise on a limousine trials car, attributing the cause to the exhaust note rather than axle noise. | 5th Dec 1922 | Box 48 \ 4 Scan183 | |
| Various engine bench tests attempting to reproduce and understand the failure of exhaust valves on a 20 HP chassis. | 27th Dec 1922 | Box 48 \ 4 Scan184 | |
| Pre-ignition issues, its effect on exhaust valves, and ongoing engine tests. | 27th Dec 1922 | Box 48 \ 4 Scan185 | |
| Report diagnosing engine pre-ignition issues in a 20 HP car. | 9th Dec 1922 | Box 48 \ 4 Scan186 | |
| Refuting claims about unacceptable noise levels in a limousine trials car by comparing it to other models. | 9th Dec 1922 | Box 48 \ 4 Scan187 | |
| Letter responding to feedback about improving an exhaust system. | 30th Dec 1922 | Box 48 \ 4 Scan188 | |
| Latest type of oiling arrangement for the 20 HP model and the trade-off between smoky exhaust and engine lubrication. | 30th Dec 1922 | Box 48 \ 4 Scan189 | |
| Test results for a 20 HP green limousine, concluding no chassis alteration is needed and defending the exhaust noise level. | 1st Jan 1923 | Box 48 \ 4 Scan190 | |
| And comparing Goshawk engine timing data with different cam configurations. | 16th Jul 1923 | Box 48 \ 4 Scan191 | |
| Rusted and cracked swan neck of a silencer on a 20HP car and a recommendation for rust protection. | 20th Aug 1923 | Box 48 \ 4 Scan192 | |
| Standardisation of lagging the exhaust pipe with asbestos to reduce heat. | 16th Aug 1923 | Box 48 \ 4 Scan193 | |
| The expansion of Goshawk 11 exhaust valves to determine the required tappet clearance. | 12th Jul 1923 | Box 48 \ 4 Scan194 | |
| Valve and cylinder block expansion. | 12th Jul 1923 | Box 48 \ 4 Scan195 | |
| Recommendation to continue using a valve design modified to 45° angle seats, with a note on sending samples. | 1st Sep 1923 | Box 48 \ 4 Scan196 | |
| To Mr. Hives requesting a report. | 22th Feb 1923 | Box 48 \ 4 Scan197 | |
| Request for a report on the 20 HP chassis exhaust pipe with a new asbestos and aluminium sheath. | 24th Oct 1923 | Box 48 \ 4 Scan198 | |
| Proposal to test soft aluminium washers as a replacement for failing copper and asbestos washers on the 20HP model. | 26th Oct 1923 | Box 48 \ 4 Scan199 | |
| Request for a report on the 20 HP Chassis Exhaust Pipe with a new asbestos and aluminium sheath. | 7th Nov 1923 | Box 48 \ 4 Scan200 | |
| Distorted exhaust pipe flange on a 20 HP chassis, proposing a larger washer for better seating. | 15th Nov 1923 | Box 48 \ 4 Scan201 | |
| Standardisation of a reduced diameter swan neck exhaust pipe to reduce noise. | 21th Dec 1923 | Box 48 \ 4 Scan202 | |
| Confirming the results from comparative road and bench tests on pipes for 20 HP cars. | 22th Jan 1924 | Box 48 \ 4 Scan203 | |
| Chasing a test report for a 20 HP chassis exhaust pipe with a new asbestos and aluminium sheath. | 18th Feb 1924 | Box 48 \ 4 Scan204 | |
| Standardisation report for an exhaust pipe stay designed to prevent vibration. | 15th Apr 1924 | Box 48 \ 4 Scan205 | |
| Standardisation document for a stay to prevent exhaust pipe vibration. | 15th Apr 1924 | Box 48 \ 4 Scan206 | |
| Testing aluminium washers for induction and exhaust pipes on a 20 HP chassis. | 30th May 1924 | Box 48 \ 4 Scan207 | |
| Report comparing horsepower figures for the Goshawk exhaust system under different configurations. | 30th May 1924 | Box 48 \ 4 Scan208 | |
| Horsepower (HP) comparison tables at various RPMs for two different exhaust configurations. | 1st Jun 1924 | Box 48 \ 4 Scan209 | |
| Extract regarding the overheating of the 20-HP Swan Neck Exhaust Pipe and a recommendation for lagging it. | 1st Jun 1924 | Box 48 \ 4 Scan210 | |
| Special silencer pipe fixing to cure exhaust pipe vibrations on a 20-HP chassis. | 25th Jun 1924 | Box 48 \ 4 Scan211 | |
| 20 HP engine exhaust tests, comparing standard and modified systems. | 1st Jul 1924 | Box 48 \ 4 Scan212 | |
| Horsepower test results for standard and experimental 20 HP exhaust configurations. | 1st Jul 1924 | Box 48 \ 4 Scan213 | |
| Road and hill climb test results for vehicle 4-G-11 on Shardlow straight and Pistern. | 1st Jul 1924 | Box 48 \ 4 Scan214 | |
| 20 HP exhaust and induction tests to improve engine performance and fuel economy. | 1st Jul 1924 | Box 48 \ 4 Scan215 | |
| Proposed exhaust and induction system tests for a 20 HP engine. | 4th Jul 1924 | Box 48 \ 4 Scan216 | |
| Extract from a visit to sales regarding a resonant exhaust note on the 20 HP model. | 14th Jul 1924 | Box 48 \ 4 Scan217 | |
| Recommended fix using a special sliding exhaust joint for vibration on 20-HP cars. | 21th Jul 1924 | Box 48 \ 4 Scan218 | |
| And comparing two schemes (563 and 564) for the 20 HP chassis exhaust system. | 9th Sep 1924 | Box 48 \ 4 Scan219 | |
| Necessity of lagging the 20 HP swan neck exhaust pipe. | 16th Sep 1924 | Box 48 \ 4 Scan220 | |
| Steering stiffness and exhaust boom issues during GMK-65 trials. | 22th Sep 1924 | Box 48 \ 4 Scan221 | |
| Investigation of a persistent 'booming' noise in a 20 HP car and requesting an experimental exhaust system for testing. | 26th Sep 1924 | Box 48 \ 4 Scan222 | |
| Reducing exhaust noise and vibrations for the 20 HP model. | 1st Sep 1924 | Box 48 \ 4 Scan223 | |
| Modified exhaust fittings for the 20 HP model, detailing schemes 563 and 564 to address vibration issues. | 26th Sep 1924 | Box 48 \ 4 Scan224 | |
| Reducing exhaust boom, recommending Scheme 564 for future production over Scheme 563. | 26th Sep 1924 | Box 48 \ 4 Scan225 | |
| Despatch of Exhaust Fittings (scheme 563) to Cricklewood. | 27th Sep 1924 | Box 48 \ 4 Scan226 | |
| Confirming the despatch of an experimental 20 HP exhaust system and fitting blueprint to Cricklewood. | 27th Sep 1924 | Box 48 \ 4 Scan227 | |
| Dispatch of a 20 HP exhaust system and fittings for experimental fitting. | 27th Sep 1924 | Box 48 \ 4 Scan228 | |
| Confirming receipt of Silencer and Exhaust fittings for a test on The Dowager Lady Cain's 20 HP car, G.F.37. | 29th Sep 1924 | Box 48 \ 4 Scan229 | |
| New and irritating exhaust noises on the 40/50 HP model. | 1st Oct 1924 | Box 48 \ 4 Scan230 | |
| New 'tinny' exhaust noise on the 40/50 HP model due to a system modification. | 30th Sep 1924 | Box 48 \ 4 Scan231 | |
| Requesting a meeting to discuss and approve standardisation alterations for the 'U' Series, specifically concerning new exhaust noises. | 20th Oct 1924 | Box 48 \ 4 Scan232 | |
| Revised design for a 20 HP exhaust downtage support and sliding spherical joint, incorporating suggestions from Mr. Royce. | 1st Dec 1924 | Box 48 \ 4 Scan233 | |
| Suitability of an exhaust pipe on a 20 HP Goshawk-11. | 13th Jan 1925 | Box 48 \ 4 Scan234 | |
| Drawing No. LeC. 2040, which shows a proposed method for anchoring the 20 HP silencer to reduce vibration. | 4th Mar 1925 | Box 48 \ 4 Scan235 | |
| Potential cancellation of instructions for fitting asbestos cord lagging on the 20 HP chassis exhaust. | 28th May 1925 | Box 48 \ 4 Scan236 | |
| Recording Mr. Royce's instruction to proceed with the production of an old type of axle. | 1st Feb 1912 | Box 49 \ 1 Scan001 | |
| Note about testing axle noise and the abandonment of the experiment. | 1st Feb 1912 | Box 49 \ 1 Scan002 | |
| The investigation into a noisy axle following instructions from Mr. Royce. | 1st Feb 1912 | Box 49 \ 1 Scan003 | |
| Note from Mr Royce detailing an experiment for testing a rear axle. | 4th Feb 1912 | Box 49 \ 1 Scan004 | |
| Instructions from Mr. Royce detailing strength testing procedures for axles. | 12th Mar 1912 | Box 49 \ 1 Scan005 | |
| Instructions from Mr. Royce regarding axle strength tests. | 12th Mar 1912 | Box 49 \ 1 Scan006 | |
| Note from Mr Royce detailing a practical experiment for testing axle strength. | 12th Mar 1912 | Box 49 \ 1 Scan007 | |
| Proposal for axle strength tests to enable the lightening of the component, including a sketch of the proposed test rig. | 12th Mar 1912 | Box 49 \ 1 Scan008 | |
| Page detailing proposed stress testing methods for vehicle axles and suspension components. | 12th Mar 1912 | Box 49 \ 1 Scan009 | |
| Page discussing stress testing methodology and the balance between component strength and unnecessary weight, referencing Lanchester's back axle. | 18th Mar 1912 | Box 49 \ 1 Scan010 | |
| Mr. Royce's suggestion to reduce axle weight by removing the aluminium liners and intermediate bearing. | 18th Mar 1912 | Box 49 \ 1 Scan011 | |
| Axles without aluminium liners and a proposal to increase shaft diameter. | 20th Mar 1912 | Box 49 \ 1 Scan012 | |
| Axle strength test results for a 1700 type axle with 25% thinner flanges. | 10th May 1912 | Box 49 \ 1 Scan013 | |
| Axle strength test results for a 1600 type standard axle with a tie rod fitted. | 13th Oct 1911 | Box 49 \ 1 Scan014 | |
| Axle strength test results for a 1700 type axle box with flanges and axle box 25% thinner than standard. | 8th Sep 1911 | Box 49 \ 1 Scan015 | |
| Axle strength test results for a standard 700 type load applied in the centre of the box. | 13th Oct 1911 | Box 49 \ 1 Scan016 | |
| Data sheet logging the results of strength tests on an old type 1600 axle with a standard tie rod fitted. | 22th Dec 1911 | Box 49 \ 1 Scan017 | |
| Axle strength test results for a 1400 type axle with modified flanges under load. | 23th Dec 1911 | Box 49 \ 1 Scan018 | |
| The results of an axle strain test on a 1700 type axle. | 21th May 1912 | Box 49 \ 1 Scan019 | |
| Axle strength test results table for a standard 1700, type X339 axle, detailing deflections under load. | 21th May 1912 | Box 49 \ 1 Scan020 | |
| To Mr Barrington regarding axle strain test results for 1600 and 1700 type axles. | 21th May 1912 | Box 49 \ 1 Scan021 | |
| Further report on axle strength tests for the standard 1700 model. | 22th May 1912 | Box 49 \ 1 Scan022 | |
| Letter from F.H. Royce regarding the specification of equipment for axle strain tests. | 11th Jul 1912 | Box 49 \ 1 Scan023 | |
| Design and quietness of an experimental bevel axle with a short pinion shaft. | 24th Jul 1912 | Box 49 \ 1 Scan024 | |
| Production options for a new axle versus an older model. | 24th Oct 1919 | Box 49 \ 1 Scan025 | |
| Departmental memo regarding a delay in axle strain tests due to waiting for a dummy frame. | 3rd Sep 1912 | Box 49 \ 1 Scan026 | |
| To Mr Barrington relaying instructions from Mr Royce regarding chassis tubes and bolts. | 20th Sep 1912 | Box 49 \ 1 Scan027 | |
| Letter discussing stress testing and strength requirements for back axles following a failure. | 27th Oct 1912 | Box 49 \ 1 Scan028 | |
| Directive on the frequency and conditions for conducting tests following alterations or at regular intervals. | 4th Dec 1912 | Box 49 \ 1 Scan029 | |
| Special parts fitted to chassis 2100E, concerning the new lighter rear axle and a new adjusting jig. | 4th Dec 1912 | Box 49 \ 1 Scan030 | |
| Weight comparison between a standard axle and a new design axle, noting a saving of 32 lbs. | 2nd Jun 1916 | Box 49 \ 1 Scan031 | |
| Request to order two sets of strengthened rear axle tube parts for testing. | 2nd Jun 1916 | Box 49 \ 1 Scan032 | |
| The transfer of a rear axle tube. | 8th Jun 1916 | Box 49 \ 1 Scan033 | |
| List of design specifications and considerations for a post-war chassis, continued from a previous page. | 1st Oct 1916 | Box 49 \ 1 Scan034 | |
| Vehicle springing, axle strength testing, and issues with aluminium brake straps. | 3rd Oct 1916 | Box 49 \ 1 Scan035 | |
| The readiness of strengthened rear axle tubes for testing on a revolving test machine. | 10th Jan 1917 | Box 49 \ 1 Scan036 | |
| Experimental alteration and testing of axle tubes due to breakages. | 11th Jan 1917 | Box 49 \ 1 Scan037 | |
| Instruction regarding a new adapter from the Experimental Department for strengthened rear axle tubes. | 12th Jan 1917 | Box 49 \ 1 Scan038 | |
| Testing procedure for altered axle tubes to justify the design change. | 13th Jan 1917 | Box 49 \ 1 Scan039 | |
| Outlining the testing procedure for composite (repair) axle tubes. | 18th Jan 1917 | Box 49 \ 1 Scan040 | |
| Listing parts required for an axle tube experiment, along with their material specifications. | 15th Mar 1916 | Box 49 \ 1 Scan041 | |
| Correcting the part number for a composite repair axle tube to be tested. | 25th Jan 1917 | Box 49 \ 1 Scan042 | |
| Testing order for composite (repair) axle tubes for Series 1700 vehicles. | 18th Jan 1917 | Box 49 \ 1 Scan043 | |
| Testing the bending resistance for altered axle tubes following a change to brake drums. | 13th Jan 1917 | Box 49 \ 1 Scan044 | |
| Parts required for an Axle Tube Experiment, referencing drawing G.5597. | 25th Jan 1917 | Box 49 \ 1 Scan045 | |
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