| Description | Date | Identifier | |
| Alternative materials for valve washers and their placement on inlet valves. | 15th May 1939 | Box 10 \ 3 03-page213 | |
| The soldering of carburetor pilot jets on engines to prevent disturbance during transit. | 31th May 1939 | Box 10 \ 3 03-page214 | |
| Changing valve sealing washers from Neuprene to thin aluminum for the B.V. & Wraith III models. | 31th May 1939 | Box 10 \ 3 03-page215 | |
| Experimental department report on the fatigue failure examination of an engine crankshaft. | 24th Aug 1929 | Box 10 \ 3 03-page216 | |
| The detailing and fitting of alum valve sealing washers. | 6th Jun 1939 | Box 10 \ 3 03-page217 | |
| Letter replying to Messrs Roe & Co Ltd regarding a sketch for an Aylesbury Lighting Regulator. | 24th Jan 1923 | Box 10 \ 3 03-page218 | |
| Proposals for the road wheels and tyres for the Wraith II model. | 19th May 1936 | Box 10 \ 4 04-page01 | |
| Tests on the composition of exhaust gases from an R.R.S. engine. | 20th Oct 1937 | Box 10 \ 4 04-page02 | |
| Design proposals for the Wraith II front hub, steering pivot, and brakes. | 26th May 1936 | Box 10 \ 4 04-page03 | |
| Confirming the order and price for two Condor III.A propellers. | 28th Feb 1924 | Box 10 \ 4 04-page04 | |
| Spoking schemes for Wraith 11 road wheels and tyres. | 27th May 1936 | Box 10 \ 4 04-page05 | |
| Failure of a Vulture V.S.I. supercharger and proposed modifications. | 24th May 1940 | Box 10 \ 4 04-page06 | |
| Cost of bronze faced cones for Rudge Whitworth wheel retaining nuts for the Wraith II. | 30th May 1936 | Box 10 \ 4 04-page07 | |
| Outlining the testing procedure for a modified C.H. Type II radiator. | 2nd Nov 1923 | Box 10 \ 4 04-page08 | |
| Definite proposals for two alternative road wheels and tyres for the Wraith II. | 9th Jun 1936 | Box 10 \ 4 04-page09 | |
| Design modifications and cost analysis for the Wraith III front hub. | 19th Mar 1937 | Box 10 \ 4 04-page11 | |
| Engine failures due to stretched connecting rod bolts and instructions for overhaul. | 18th Sep 1936 | Box 10 \ 4 04-page12 | |
| Suggestion to delete the monogram from the hub cap to reduce cost and make the Wraith and Bentley hub caps identical. | 19th Mar 1937 | Box 10 \ 4 04-page13 | |
| Illegible document due to extreme fading and poor quality. | 9th Apr 1937 | Box 10 \ 4 04-page14 | |
| Confirming the decision to redesign the Wraith III Front Hub due to manufacturing difficulties with die-casting. | 9th Apr 1937 | Box 10 \ 4 04-page15 | |
| Works instruction regarding the modification of rear road spring bolts for lubrication. | 20th Sep 1922 | Box 10 \ 4 04-page16 | |
| Design modification for the Wraith III Front Hub, replacing a die-cast part with a steel forging. | 14th Apr 1937 | Box 10 \ 4 04-page17 | |
| Proposed design change to the Wraith III front wheel hubs for reasons of economy. | 7th Jul 1937 | Box 10 \ 4 04-page19 | |
| With a handwritten annotation at the top, with the main body of text being too faded and illegible to read. | 7th Sep 1937 | Box 10 \ 4 04-page20 | |
| Wheel proposals from Dunlop for the Wraith Chassis, advising against cheaper options. | 7th Sep 1937 | Box 10 \ 4 04-page21 | |
| Clarifying the tyre and wheel specifications for the Wraith and 'M' Series Bentley. | 20th Oct 1937 | Box 10 \ 4 04-page23 | |
| Wraith front hub retaining nut and requesting a modification for compatibility with Bentley parts. | 19th Nov 1937 | Box 10 \ 4 04-page25 | |
| Instructing the stores to despatch a complete 6.50 x 16 wheel and tyre. | 24th Jan 1938 | Box 10 \ 4 04-page27 | |
| Notice from the Inspection Department regarding a dimensional concession for Merlin II cylinder blocks. | 1st Dec 1938 | Box 10 \ 4 04-page28 | |
| Letter to Cornercroft Ltd. regarding the loan of a wheel and tyre to be used as a model for wheel covers. | 24th Jan 1938 | Box 10 \ 4 04-page29 | |
| Experimental Department. | 12th Sep 1929 | Box 10 \ 4 04-page30 | |
| Issues with Wraith wheels, including clunking noises and tightening torque calculations. | 16th Feb 1938 | Box 10 \ 4 04-page31 | |
| Typed internal memorandum or report with illegible text. | 24th Oct 1939 | Box 10 \ 4 04-page32 | |
| Calculation of spanner and driving torques for a clutch system considering friction. | 10th Feb 1938 | Box 10 \ 4 04-page33 | |
| Carburation test for an 'F' engine with 90mm venturis, detailing power, consumption, and flying qualities. | 28th Oct 1929 | Box 10 \ 4 04-page34 | |
| Calculations for spanner torque required to prevent clonking in two different cases. | 16th Feb 1938 | Box 10 \ 4 04-page35 | |
| Test report on the effect of a new type of flexible engine mounting on vibration. | 10th May 1938 | Box 10 \ 4 04-page36 | |
| Holding production of 'B' Series road wheels and retaining nuts for the Wraith. | 10th May 1938 | Box 10 \ 4 04-page37 | |
| The introduction of a spring to prevent brake shoe rattling. | 23th Feb 1939 | Box 10 \ 4 04-page38 | |
| Proposal to fit larger 17-inch rims with 7-inch section tyres to the Wraith III Limousine and the resulting clearance issues. | 12th May 1938 | Box 10 \ 4 04-page39 | |
| Test report on the fatigue failure and subsequent engine testing of 'Little Piston' type connecting rods. | 22th Dec 1939 | Box 10 \ 4 04-page40 | |
| Status of wheels that are on order. | 12th May 1938 | Box 10 \ 4 04-page41 | |
| Technical query regarding piston position at bottom dead centre. | 24th May 1938 | Box 10 \ 4 04-page42 | |
| Confirming a conversation and requesting a drawing of a simple steel disc for a Wraith wire wheel. | 24th May 1938 | Box 10 \ 4 04-page43 | |
| Modification notice for the 'Griffon' II & IV engine supercharger drive ratio. | 19th Sep 1940 | Box 10 \ 4 04-page44 | |
| Test report on the safety of 30° cone angle Rudge Whitworth wheels for the Wraith model. | 1st Jun 1938 | Box 10 \ 4 04-page45 | |
| Advising against changing the Merlin engine carburettor before the Schneider Trophy Race. | 30th Mar 1931 | Box 10 \ 4 04-page46 | |
| Order for four unplated discs for Wraith wheels. | 8th Jun 1938 | Box 10 \ 4 04-page47 | |
| The provision for a damper on the 'F' engine crankshaft. | 20th Oct 1925 | Box 10 \ 4 04-page48 | |
| Letter requesting a supply of special lubricant for the new 25/30 HP wheels. | 6th Oct 1938 | Box 10 \ 4 04-page49 | |
| Instructions on lubricating Wraith wheels with Keenol (KG.20) to prevent clonks. | 8th Oct 1938 | Box 10 \ 4 04-page51 | |
| With completely faded and illegible text. | 8th Oct 1938 | Box 10 \ 4 04-page52 | |
| Diagram illustrating the method for fitting a Wraith wheel to prevent clunks. | 10th Oct 1938 | Box 10 \ 4 04-page53 | |
| Cover sheet with a 'Print Room' stamp and handwritten reference number. | 10th Oct 1938 | Box 10 \ 4 04-page54 | |
| Request to send a 5-pound tin of Duckham's Kleenol grease to Lillie Hall for use on Wraith wheels. | 10th Oct 1938 | Box 10 \ 4 04-page55 | |
| Confirming travel arrangements for two men to Hucklecote following a telephone conversation. | 10th Jun 1938 | Box 10 \ 4 04-page56 | |
| Updates to 'C' series Wraith wheels from Dunlops. | 12th Jan 1939 | Box 10 \ 4 04-page57 | |
| Note on fitting stiffer propeller drive shafts to Kestrel engines for the 1929 Schneider Trophy race. | 9th Jan 1939 | Box 10 \ 4 04-page58 | |
| File note concerning 'Wraith Wheels' with a cross-reference. | 9th Jan 1939 | Box 10 \ 4 04-page59 | |
| Blank or unrecorded page. | 9th Jan 1939 | Box 10 \ 4 04-page60 | |
| Car weight reduction through the use of smaller wheel sizes. | 19th Mar 1935 | Box 10 \ 5 05-page001 | |
| Comparative table of wheel and tyre weights, and ground clearances for various car models. | 14th Mar 1935 | Box 10 \ 5 05-page003 | |
| Comparison table of wheel and tyre weights in pounds for various car models and projects. | 19th Mar 1935 | Box 10 \ 5 05-page005 | |
| Weight analysis of the Wraith II chassis and strategies to prevent it from becoming heavier. | 2nd May 1928 | Box 10 \ 5 05-page007 | |
| Preliminary vibration tests on a 'Merlin II' engine. | 2nd May 1928 | Box 10 \ 5 05-page008 | |
| Weight comparison sheet for various car parts across different models and design estimates. | 2nd May 1928 | Box 10 \ 5 05-page009 | |
| Completely illegible and damaged document page. | 2nd May 1928 | Box 10 \ 5 05-page010 | |
| Weight comparison sheet for the Wraith II and 25/30 models. | 2nd May 1928 | Box 10 \ 5 05-page011 | |
| Almost entirely illegible typed document, likely a report or specification list. | 24th Apr 1936 | Box 10 \ 5 05-page012 | |
| Front end weight comparison of suspensions for Bentley, Wraith, and Packard models. | 24th Apr 1936 | Box 10 \ 5 05-page013 | |
| Comparison table of front-end component weights for various chassis models. | 24th Apr 1936 | Box 10 \ 5 05-page015 | |
| Cost and weight comparison between an all-aluminium monoblock (J.III type) unit and an existing cast iron 20/25 unit. | 14th May 1938 | Box 10 \ 5 05-page017 | |
| Proof test report on a No. 18 Piston for an Experimental Kestrel XVII engine, detailing scoring on the skirt. | 14th May 1938 | Box 10 \ 5 05-page018 | |
| Secret cover memo instructing the substitution of a previous memo with an attached one. | 4th Feb 1937 | Box 10 \ 5 05-page019 | |
| Alteration to the rear axle casing on the 40/50 HP chassis. | 26th Jan 1928 | Box 10 \ 5 05-page020 | |
| Complete weight analysis of a Wraith vehicle, detailing chassis, body, and accessory weights. | 24th Apr 1936 | Box 10 \ 5 05-page021 | |
| Heavily faded and illegible typed document page. | 5th Feb 1937 | Box 10 \ 5 05-page022 | |
| Requesting a weight analysis comparison between the Wraith chassis and the 25/30 model. | 5th Feb 1937 | Box 10 \ 5 05-page023 | |
| Weight analysis and specifications of the Wraith model compared to other vehicles. | 6th Feb 1937 | Box 10 \ 5 05-page025 | |
| Heavily faded and almost entirely illegible typed document. | 6th Feb 1937 | Box 10 \ 5 05-page026 | |
| Proposal to shorten the Wraith wheelbase based on tests on the longer wheelbase Phantom III. | 6th Feb 1937 | Box 10 \ 5 05-page027 | |
| Completely faded and illegible document page. | 6th Feb 1937 | Box 10 \ 5 05-page028 | |
| List of weights for various components of the Wraith chassis. | 12th Jan 1938 | Box 10 \ 5 05-page029 | |
| List of parts and modifications for Merlin engines, focusing on the supercharger drive and its components. | 12th Jan 1938 | Box 10 \ 5 05-page030 | |
| Preliminary weight comparisons for the 'Wraith' car relative to the 25/30 model. | 16th Feb 1937 | Box 10 \ 5 05-page031 | |
| Strip examination report of a Merlin XX engine following a 300-hour endurance test. | 22th Oct 1943 | Box 10 \ 5 05-page032 | |
| Comparison of component weights between the 25/30 HP and Wraith models. | 15th Feb 1937 | Box 10 \ 5 05-page033 | |
| Heavily faded and mostly blank document with faint lines. | 15th Feb 1937 | Box 10 \ 5 05-page034 | |
| Comparison of steering system component weights between the 25/30 HP & Wraith models. | 15th Feb 1937 | Box 10 \ 5 05-page035 | |
| Weight comparison of brake gear components between the 25/30 HP and Wraith models. | 15th Feb 1937 | Box 10 \ 5 05-page037 | |
| Completely blank or severely faded document where no content is discernible. | 15th Feb 1937 | Box 10 \ 5 05-page038 | |
| Comparison of component weights between the 25/30 HP and Wraith models. | 15th Feb 1937 | Box 10 \ 5 05-page039 | |
| Blank or completely faded document page. | 15th Feb 1937 | Box 10 \ 5 05-page040 | |
| Weight comparison of the petrol tanks for the 25/30 HP and Wraith models. | 15th Feb 1937 | Box 10 \ 5 05-page041 | |
| Heavily faded or blank document page where the content is no longer visible. | 15th Feb 1937 | Box 10 \ 5 05-page042 | |
| Weight comparison of the frames for the 25/30 HP and Wraith models. | 15th Feb 1937 | Box 10 \ 5 05-page043 | |
| Blank or completely illegible document page. | 15th Feb 1937 | Box 10 \ 5 05-page044 | |
| Comparison of cooling section component weights for the 25/30 HP and Wraith models. | 15th Feb 1937 | Box 10 \ 5 05-page045 | |
| Weight comparison of front suspension components for the 25/30 HP and Wraith models. | 15th Feb 1937 | Box 10 \ 5 05-page047 | |
| Blank page, possibly a separator sheet or the reverse of a document. | 15th Feb 1937 | Box 10 \ 5 05-page048 | |
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