| Description | Date | Identifier | |
| The complete car weights for the Wraith and Phantom III models. | 14th Oct 1938 | Box 96 \ 4 scan0139 | |
| Table outlining weight savings for a blown Phantom III engine. | 14th Oct 1938 | Box 96 \ 4 scan0140 | |
| Weight calculation for fitting an aero type blower to a Phantom III engine with comparative data from Merlin II and Kestrel VI engines. | 14th Oct 1938 | Box 96 \ 4 scan0141 | |
| Aero calculations for the Phantom III engine, detailing boost performance and comparing specific outputs with the Merlin and Peregrine engines. | 14th Oct 1938 | Box 96 \ 4 scan0142 | |
| Breakdown of weights for Phantom III and B.III engine components for marine builders consideration. | 18th Oct 1938 | Box 96 \ 4 scan0143 | |
| The weight of a complete Bentley III power plant. | 29th Apr 1939 | Box 96 \ 4 scan0144 | |
| Weights of four Phantom III cars and the chassis weight with an overdrive gearbox. | 29th Apr 1939 | Box 96 \ 4 scan0145 | |
| Design considerations for Spectre road wheels to prevent spoke breakage. | 21th Aug 1935 | Box 96 \ 4 scan0146 | |
| Painting of wheels for experimental cars and the design of special Spectre wheels with discs. | 26th Aug 1935 | Box 96 \ 4 scan0147 | |
| Instruction to make and fit a second set of balance weight bases and bolts to a further set of Spectre wheels. | 14th Sep 1935 | Box 96 \ 4 scan0148 | |
| Modified spoking for Phantom III road wheels on production chassis. | 18th Oct 1935 | Box 96 \ 4 scan0149 | |
| Issues with the Dunlop detachable hub on Phantom III road wheels and considering the Rudge Whitworth type as an alternative. | 26th Oct 1935 | Box 96 \ 4 scan0150 | |
| Various types of detachable wheels and supplier options. | 26th Oct 1935 | Box 96 \ 4 scan0151 | |
| Approving the Dunlop design for Phantom III road wheels, which increases the track width. | 22th Jun 1936 | Box 96 \ 4 scan0152 | |
| Failure of Phantom III valve springs and the subsequent investigation. | 23th Jul 1936 | Box 96 \ 4 scan0153 | |
| Material tests and solutions for the rapid wear of rear wheel drivers. | 24th Oct 1936 | Box 96 \ 4 scan0154 | |
| Series of wheel experiments for standardisation and stress testing. | 9th Nov 1936 | Box 96 \ 4 scan0155 | |
| Official order for rubber discs to the British Tyre & Rubber Co. Ltd. | 4th Dec 1936 | Box 96 \ 4 scan0156 | |
| Creaking road wheels on the Phantom III, caused by an unsatisfactory fit of the tapers on the wheel shell and removing nut. | 18th Dec 1936 | Box 96 \ 4 scan0157 | |
| Testing new wheel discs with modified valve extensions from Cornercroft on a Phantom III car. | 26th Jan 1937 | Box 96 \ 4 scan0158 | |
| Short memo confirming the readiness to test wheel discs upon their arrival. | 29th Jan 1937 | Box 96 \ 4 scan0159 | |
| Requesting an official order be passed to Messrs. Park Ward for a Phantom III wheel well. | 2nd Feb 1937 | Box 96 \ 4 scan0160 | |
| Road wheels for the Phantom III chassis, detailing the continuation of current wheels for the 'C' series and upcoming tests for the 'D' series. | 17th Mar 1937 | Box 96 \ 4 scan0161 | |
| Follow-up inquiry regarding the trial of experimental Ace Wheel Discs on a Phantom III chassis. | 23th Mar 1937 | Box 96 \ 4 scan0162 | |
| The mileage testing of Phantom III Ace wheel discs. | 24th Mar 1937 | Box 96 \ 4 scan0163 | |
| Directive regarding the standardisation of the Phantom III road wheel rim type. | 21th Apr 1937 | Box 96 \ 4 scan0164 | |
| The standardization of the new wide rim wheel for the Phantom III and the required new disc. | 25th May 1937 | Box 96 \ 4 scan0165 | |
| Letter to Cornercroft Ltd. concerning the loan of a Phantom III road wheel for fitting discs. | 31th May 1937 | Box 96 \ 4 scan0166 | |
| The loan of one set of Phantom III road wheels to Cornercroft Ltd. | 31th May 1937 | Box 96 \ 4 scan0167 | |
| Reports of creaks from wheels and dry, rusty wheel drivers on a Phantom III vehicle. | 15th Mar 1938 | Box 96 \ 4 scan0168 | |
| Diagnosing and fixing a wheel driver knock on a Phantom III vehicle. | 17th Mar 1938 | Box 96 \ 4 scan0169 | |
| Complaints of wheel driver knock or creak for the Phantom III model. | 23th Sep 1938 | Box 96 \ 4 scan0170 | |
| Graph plotting mileage against chassis number for complaints of creak or knock from PIII model wheel drivers. | 21th Sep 1938 | Box 96 \ 4 scan0171 | |
| Rear track dimensions for the Silver Wraith model, comparing it to the Wraith III and Phantom III. | 17th May 1939 | Box 96 \ 4 scan0172 | |
| Stresscoat Lacquer test performed on a Phantom III wheel rim to investigate stresses produced by tyre inflation. | 29th Jun 1939 | Box 96 \ 4 scan0173 | |
| Stress testing a wheel rim using stresscoat lacquer to analyze compressive and tensile stresses. | 29th Jun 1939 | Box 96 \ 4 scan0174 | |
| Blueprint detailing the results of a Stresscoat lacquer test on a Phantom III wheel rim. | 26th Jun 1939 | Box 96 \ 4 scan0175 | |
| Stresscoat lacquer test on a Phantom III wheel rim showing crack diagrams. | 20th Jun 1939 | Box 96 \ 4 scan0176 | |
| Summary of design work completed and in hand for the Bentley III chassis. | 20th Nov 1936 | Box 97 \ 1 scan0001 | |
| Design position report detailing the status of various modifications and schemes for the Bentley Chassis. | 12th Nov 1936 | Box 97 \ 1 scan0002 | |
| Design status report listing various vehicle component modifications and their completion status. | 20th Nov 1936 | Box 97 \ 1 scan0003 | |
| Review of the Bentley III's development, covering changes in chassis, engine, and performance compared to earlier models. | 23th Nov 1936 | Box 97 \ 1 scan0004 | |
| Trade-offs between increased weight, body space, and performance in Bentley models. | 23th Nov 1936 | Box 97 \ 1 scan0005 | |
| 1938 Motor Show model, independent suspension, and the potential market impact of the Bentley III. | 23th Nov 1936 | Box 97 \ 1 scan0006 | |
| Diagrams showing the relative weight increases of Bentley chassis and bodies between 1933 and 1936. | 20th Nov 1936 | Box 97 \ 1 scan0007 | |
| Weight summary of Bentley Standard Saloon bodies fitted to Trials Cars from 1934-1936. | 25th Nov 1936 | Box 97 \ 1 scan0008 | |
| Weight schedule for standard saloon bodies fitted to experimental cars from 1934-1936. | 23th Nov 1936 | Box 97 \ 1 scan0009 | |
| Weight of the Bentley III car, aiming to avoid increases and exploring options for weight reduction. | 25th Nov 1936 | Box 97 \ 1 scan0010 | |
| Experimental testing of Bentley bearings, covering both test bench and road tests. | 15th Dec 1936 | Box 97 \ 1 scan0011 | |
| The testing, standardisation, and failure analysis of A.O.7 aluminium tin alloy bearings for the 4 1/4 Litre Bentley engine. | 15th Dec 1936 | Box 97 \ 1 scan0012 | |
| Endurance testing to reproduce and resolve big end seizure failures by modifying the lubrication system. | 18th Dec 1936 | Box 97 \ 1 scan0013 | |
| The performance and failure modes of different big end bearing materials and designs. | 15th Dec 1936 | Box 97 \ 1 scan0014 | |
| The comparison of bearing materials, test bed seizures, clearances, and issues with main bearings. | 15th Dec 1936 | Box 97 \ 1 scan0015 | |
| The performance tests of various alternative engine bearings. | 16th Dec 1936 | Box 97 \ 1 scan0016 | |
| Analysis of whitemetal compositions, issues with shims, and a report on crankshaft wear. | 15th Dec 1936 | Box 97 \ 1 scan0017 | |
| Analysis of crankshaft journal wear, oil feed theories, and material test results, concluding with a recommendation for RR.56 solid shims. | 15th Dec 1936 | Box 97 \ 1 scan0018 | |
| Improved lubrication, main bearing experiments, and the results of an external filter test. | 15th Dec 1936 | Box 97 \ 1 scan0019 | |
| Bar chart comparing the endurance in hours of various connecting rod bearings. | 22th Jan 1936 | Box 97 \ 1 scan0020 | |
| Bar chart showing the total running time and endurance of various main bearings. | 27th Nov 1936 | Box 97 \ 1 scan0021 | |
| Photographic record showing the condition of No.2 and No.5 big end bearings after a test run. | 27th Nov 1936 | Box 97 \ 1 scan0022 | |
| Photograph comparing B.17 Rear Main and No.4 Big End bearings after test runs. | 27th Nov 1936 | Box 97 \ 1 scan0023 | |
| Photograph showing the results of an endurance test on B.17 unit bearings and liners, highlighting specific failures. | 27th Nov 1936 | Box 97 \ 1 scan0024 | |
| Photograph of B.17 unit big end bearings after a test run. | 27th Nov 1936 | Box 97 \ 1 scan0025 | |
| Photographic record of B.19 big end bearings and shims after a test, showing a failure in bearing No. 3. | 27th Nov 1936 | Box 97 \ 1 scan0026 | |
| Photograph of B.3. Unit Big End Bearings and Liners after a running test. | 27th Nov 1936 | Box 97 \ 1 scan0027 | |
| Photograph showing Hoyt's metal main bearings after an 11-hour full throttle endurance test. | 27th Nov 1936 | Box 97 \ 1 scan0028 | |
| Photograph of B.17 unit main bearings and shims after a 22-hour full throttle endurance test. | 27th Nov 1936 | Box 97 \ 1 scan0029 | |
| Photograph showing B3 Unit RR.56 main bearings with modified intermediate grooves after a test run which resulted in seizing. | 27th Nov 1936 | Box 97 \ 1 scan0030 | |
| Photograph showing the upper and lower halves of seven main bearings laid out for inspection. | 27th Nov 1936 | Box 97 \ 1 scan0031 | |
| Bentley (28 B.H. Unit Trials Car) bearings which are standard Hall's AC7 metal, after 22,000 miles running. | 27th Nov 1936 | Box 97 \ 1 scan0032 | |
| Photograph of big end bearings from a B22 engine after a 15,000-mile test, showing a failure in bearing number 6. | 27th Nov 1936 | Box 97 \ 1 scan0033 | |
| Photograph showing the condition of used C.15 (25/30) unit main bearings after testing. | 27th Nov 1936 | Box 97 \ 1 scan0034 | |
| Photograph showing a set of big end bearings and caps after a test run. | 21th Jan 1937 | Box 97 \ 1 scan0035 | |
| Confirming an agreement to proceed with the production of three Bentley III's. | 21th Jan 1937 | Box 97 \ 1 scan0036 | |
| Agreeing chassis lengths for the first three Bentley III cars and discussing frame details. | 25th Jan 1937 | Box 97 \ 1 scan0037 | |
| Design progress and modifications to the Bentley chassis frame. | 25th Jan 1937 | Box 97 \ 1 scan0038 | |
| Design position report for the Bentley III chassis, listing various components and their completion status. | 19th Jan 1937 | Box 97 \ 1 scan0039 | |
| Design position report for Bentley III and 4 1/2 Litre chassis modifications. | 19th Jan 1937 | Box 97 \ 1 scan0040 | |
| Chassis length and exhaust system details for the Bentley III. | 25th Jan 1937 | Box 97 \ 1 scan0041 | |
| Secret memo requesting to process details for the Short Chassis Bentley III. | 26th Jan 1937 | Box 97 \ 1 scan0042 | |
| Modification to the top pivot cover for a Bentley III. | 1st Feb 1937 | Box 97 \ 1 scan0043 | |
| Proposed specification document for the Bentley III model. | 9th Apr 1937 | Box 97 \ 1 scan0044 | |
| List of vehicle components and their specifications, often in comparison to the Wraith III model. | 9th Apr 1937 | Box 97 \ 1 scan0045 | |
| List of proposed modifications and specifications for various vehicle components. | 9th Apr 1937 | Box 97 \ 1 scan0046 | |
| Specification sheet for various vehicle components, referencing parts from Wraith III and Bentley models. | 15th Apr 1937 | Box 97 \ 1 scan0047 | |
| Specification document detailing modifications for the Bentley III chassis. | 15th Apr 1937 | Box 97 \ 1 scan0048 | |
| Secret memo discussing the retention of the revolution counter and instrument design for the Bentley B.III model. | 15th Apr 1937 | Box 97 \ 1 scan0049 | |
| Specifications and comparisons for different configurations of an 8-cylinder engine. | 13th May 1937 | Box 97 \ 1 scan0050 | |
| The future engine for the Wraith and Bentley III, considering a Straight 8 engine as a replacement. | 22th May 1937 | Box 97 \ 1 scan0051 | |
| Fitting a supercharger to a Wraith and future engine and model strategy. | 22th May 1937 | Box 97 \ 1 scan0052 | |
| List of modifications to a Straight Eight Wraith engine to increase displacement and meet production requirements. | 8th Jun 1937 | Box 97 \ 1 scan0053 | |
| Proposed programme and timeline for the Bentley TTT model. | 15th Jun 1937 | Box 97 \ 1 scan0054 | |
| Design revisions for the Bentley III Tachometer Drive pinion cutting process. | 26th Jun 1937 | Box 97 \ 1 scan0055 | |
| Endurance testing of new parts for a Bentley, including die-cast bearings, crank casts, and clutch improvements. | 2nd Jul 1937 | Box 97 \ 1 scan0056 | |
| Listing parts ready for production for the Bentley III, detailing potential modifications and queries. | 12th Aug 1937 | Box 97 \ 1 scan0057 | |
| List of specifications for various engine components including the crankshaft, connecting rods, and pistons. | 12th Aug 1937 | Box 97 \ 1 scan0058 | |
| List of decisions and outstanding points for various engine and chassis components. | 12th Aug 1937 | Box 97 \ 1 scan0059 | |
| The future of the existing Bentley model, balancing performance, comfort, and market demand. | 20th Aug 1937 | Box 97 \ 1 scan0060 | |
| Cover note for a suggested specification for model B.II.A to maintain sales while the Bentley III was being finalised. | 21th Aug 1937 | Box 97 \ 1 scan0061 | |
| Proposed specification for the Bentley II.A, listing changes from both customer and company perspectives. | 25th Aug 1937 | Box 97 \ 1 scan0062 | |
| | | | |
