| Description | Date | Identifier | |
| Table of test results showing Brake Horsepower (BHP) and power loss for various exhaust system configurations at 4,000 RPM. | 18th Jun 1938 | Box 8 \ 8 08-page59 | |
| Table comparing Brake Horsepower (B.HP) and power loss for various exhaust system configurations at 3,500 R.P.M. | 17th Aug 1938 | Box 8 \ 8 08-page60 | |
| Blueprint detailing the design and dimensions of a silencer. | 17th Aug 1938 | Box 8 \ 8 08-page61 | |
| Material options and design changes for the Wraith III exhaust silencer to improve durability. | 15th Sep 1938 | Box 8 \ 8 08-page62 | |
| Recommendation to produce a silencer with balance holes of at least .1875 diameter. | 15th Sep 1938 | Box 8 \ 8 08-page63 | |
| Whistling issue with the Wraith exhaust system silencers and a recommendation to limit stock production. | 9th Sep 1938 | Box 8 \ 8 08-page64 | |
| Production of the first 100 silencers for the Wraith Exhaust System and a hold on further drilling of pipes. | 16th Sep 1938 | Box 8 \ 8 08-page65 | |
| Request to make a mild steel pattern for the internal pipes and baffle of the exhaust system for a Wraith Car 25.G.VI. | 20th Sep 1938 | Box 8 \ 8 08-page66 | |
| Modification to the Wraith exhaust system to eliminate a whistling noise. | 6th Oct 1938 | Box 8 \ 8 08-page67 | |
| Request to make up two each of modified exhaust suspensions to schemes ECD.919 and ECD.921. | 7th Oct 1938 | Box 8 \ 8 08-page68 | |
| Difficulties with exhaust joints on the 'Wraith' chassis, proposing the introduction of a 'Corrujoint' washer. | 10th Oct 1938 | Box 8 \ 8 08-page69 | |
| Revised exhaust system without a front expansion box for the Wraith III model. | 5th Nov 1938 | Box 8 \ 8 08-page70 | |
| Using a Buick exhaust system for installing a line 8 engine in a Wraith Replacement chassis. | 10th Nov 1938 | Box 8 \ 8 08-page71 | |
| Blueprint of an 8-cylinder Buick exhaust system with support brackets. | 20th Mar 1939 | Box 8 \ 8 08-page72 | |
| File note regarding the B.III and W.III Exhaust Manifold. | 28th Nov 1938 | Box 8 \ 8 08-page73 | |
| Requesting three sets of parts for the latest Wraith exhaust system to be made and fitted to specific cars. | 9th Jan 1939 | Box 8 \ 8 08-page74 | |
| Requesting a fourth Wraith exhaust system with suspensions be sent to Paris. | 18th Jan 1939 | Box 8 \ 8 08-page75 | |
| The dispatch of parts for a Wraith exhaust system to the Paris depot. | 28th Jan 1939 | Box 8 \ 8 08-page76 | |
| Official order for two sheets of rubber from British Tyre & Rubber Co.Ltd. | 10th Mar 1939 | Box 8 \ 8 08-page77 | |
| New type of exhaust system for the Wraith model, addressing bolt stretching and silencer sagging. | 21th Mar 1939 | Box 8 \ 8 08-page78 | |
| Report comparing a new engine unit's power loss due to exhaust back pressure against a conventional unit. | 29th Mar 1939 | Box 8 \ 8 08-page79 | |
| Analysis of exhaust system tests on a B.60 unit, comparing power losses between different configurations. | 29th Mar 1939 | Box 8 \ 8 08-page80 | |
| Performance graph analysing different exhaust system configurations on a B60 engine. | 29th Mar 1939 | Box 8 \ 8 08-page81 | |
| Graph comparing the percentage power loss against back pressure for B60 and BV engines. | 17th Apr 1939 | Box 8 \ 8 08-page82 | |
| Investigation into failures of the Wraith exhaust system's corrujoints. | 17th Apr 1939 | Box 8 \ 8 08-page83 | |
| Modifications to the exhaust manifolds for the Wraith III and Bentley models. | 18th Apr 1939 | Box 8 \ 8 08-page84 | |
| Future changes to the Wraith exhaust system's corrujoints. | 19th Apr 1939 | Box 8 \ 8 08-page85 | |
| Fitting of new bolts, distance pieces, and spherical washers to the Wraith & Bentley experimental cars' exhaust systems. | 25th Apr 1939 | Box 8 \ 8 08-page86 | |
| Alterations to the Wraith exhaust system prints before production. | 26th Apr 1939 | Box 8 \ 8 08-page87 | |
| Requesting the instrumentation of three exhaust manifolds for Wraith & Bentley cars, involving the deletion of the spherical joint. | 28th Apr 1939 | Box 8 \ 8 08-page88 | |
| Test results and instructions for a Wraith III exhaust system corrujoint, including annealing and coating procedures. | 10th May 1939 | Box 8 \ 8 08-page89 | |
| The condition of the Wraith exhaust system and a follow-up on a potential modification. | 28th Jul 1939 | Box 8 \ 8 08-page90 | |
| Unsatisfactory performance of the Wraith fan and proposing modifications using a Cadillac fan and new pulleys. | 25th Jun 1937 | Box 8 \ 9 09-page01 | |
| Particulars of Wraith improved drive fan pulleys. | 26th Jul 1937 | Box 8 \ 9 09-page02 | |
| Request for a new fan and belt for a Wraith vehicle due to excessive noise and a stretched belt. | 26th Jul 1937 | Box 8 \ 9 09-page03 | |
| Reporting the failure of a new fan belt for a 25/30 HP model after a short period of use. | 22th Aug 1937 | Box 8 \ 9 09-page04 | |
| Fan belt stretch, the fitting of a new Cadillac type fan to car 26.G.VI, and a request for information on water loss. | 23th Aug 1937 | Box 8 \ 9 09-page05 | |
| Blueprints for a modified Wraith fan, reducing the diameter of a Cadillac 5-blade fan by 2 inches for chassis 27-G-V1. | 17th Sep 1937 | Box 8 \ 9 09-page06 | |
| List of tracings for the revision or addition of operations for the Wraith III Chassis Fan, Section 3220. | 25th Oct 1937 | Box 8 \ 9 09-page07 | |
| Request to build three further sets of Wraith fans for six experimental cars being built. | 11th Oct 1937 | Box 8 \ 9 09-page08 | |
| The modification of a Wraith fan blade by reducing its diameter. | 18th Sep 1937 | Box 8 \ 9 09-page09 | |
| Endurance test on a Wraith 5 blade fan. | 2nd Nov 1937 | Box 8 \ 9 09-page10 | |
| Requesting to fit a Wraith 5 blade fan to a car while it is in the shop for other modifications. | 12th Nov 1937 | Box 8 \ 9 09-page11 | |
| Incorrect material used for a fractured Wraith fan blade. | 15th Nov 1937 | Box 8 \ 9 09-page12 | |
| Technical memorandum detailing the investigation and proposed alterations for a five-bladed unequal pitch fan on the Wraith lll. | 22th Nov 1937 | Box 8 \ 9 09-page13 | |
| Laboratory report investigating the failure of a Wraith fan blade, EW.947. | 16th Nov 1937 | Box 8 \ 9 09-page14 | |
| Laboratory report showing a broken and cracked Bentley C.B. IV radiator fan. | 16th Nov 1937 | Box 8 \ 9 09-page15 | |
| Laboratory report with a micrograph showing cracks on a Bentley 6 B.IV Radiator Fan. | 24th Nov 1937 | Box 8 \ 9 09-page16 | |
| Instruction to proceed with building fans for 6 Wraith cars to the latest specifications, despite material delays. | 24th Nov 1937 | Box 8 \ 9 09-page17 | |
| Revision and production of a 5-blade fan for the Wraith car. | 7th Dec 1937 | Box 8 \ 9 09-page18 | |
| Instructions to fit a 5-blade fan set and a new Goodrich belt to a 25.O.V1. car. | 7th Dec 1937 | Box 8 \ 9 09-page19 | |
| Requesting the production of 2 fan pulleys for old type Wraith engines. | 15th Dec 1937 | Box 8 \ 9 09-page20 | |
| Instruction to fit a 5-blade fan part set to a different car due to limited availability. | 15th Dec 1937 | Box 8 \ 9 09-page21 | |
| Instructions for packing 5-blade Cadillac fans for the Wraith model with special grease. | 16th Dec 1937 | Box 8 \ 9 09-page22 | |
| Requesting an endurance test on a Wraith fan with specific fitting instructions. | 1st Feb 1938 | Box 8 \ 9 09-page23 | |
| To hold the order for Wraith fan blades due to a potential material change to avoid distortion. | 4th Feb 1938 | Box 8 \ 9 09-page24 | |
| Endurance testing and examination of a fan for a Wraith vehicle. | 8th Feb 1938 | Box 8 \ 9 09-page25 | |
| Eliminating the fan belt adjustment on Wraith & B.III models due to new 'Fero-grip' belts with negligible stretch. | 8th Feb 1938 | Box 8 \ 9 09-page26 | |
| Requesting the design of a modified fan mounting for the Wraith and Bentley III models. | 18th Feb 1938 | Box 8 \ 9 09-page27 | |
| Material properties for Wraith and Phantom III fan blades. | 19th Feb 1938 | Box 8 \ 9 09-page28 | |
| Wraith fan mounting scheme, detailing measurements and adjustments for the fan belt. | 23th Feb 1938 | Box 8 \ 9 09-page29 | |
| Change of fan blade material from soft aluminium to a stiffer one for Wraith & B.III models. | 26th Feb 1938 | Box 8 \ 9 09-page30 | |
| Request for a cost comparison of a revised fan mounting for the Wraith, B.III, and B.50 models. | 3rd Mar 1938 | Box 8 \ 9 09-page31 | |
| Modified fan fixing and adjustment for the Wraith III. | 4th Mar 1938 | Box 8 \ 9 09-page32 | |
| Modified fan fixing and adjustment design for the Wraith III engine. | 4th Mar 1938 | Box 8 \ 9 09-page33 | |
| Request for a cost estimation per chassis for supplying and fitting fans and drives at a service depot. | 14th Apr 1938 | Box 8 \ 9 09-page34 | |
| Costing for the supply and fitting of a 5-Blade Fan (Cadillac Type) for a Phantom III chassis. | 25th Apr 1948 | Box 8 \ 9 09-page35 | |
| Request to manufacture a fan pulley to specification EXS.282890 for older Wraith engine units. | 2nd May 1938 | Box 8 \ 9 09-page36 | |
| Request to run an endurance test on the production type fan for the Wraith No.4 unit. | 5th May 1938 | Box 8 \ 9 09-page37 | |
| The 18-hour test bed endurance run of the Wraith Production Fan. | 28th Jun 1938 | Box 8 \ 9 09-page38 | |
| Modification to the Wraith fan mounting casting for production. | 29th Jun 1938 | Box 8 \ 9 09-page39 | |
| Blueprints for a Fan Flange designed for the 'Pauline' Streamlined car. | 16th Aug 1938 | Box 8 \ 9 09-page40 | |
| Phantom III and Wraith five-blade fan failures during testing, with proposals for material changes. | 20th Sep 1938 | Box 8 \ 9 09-page41 | |
| Fan blades for the Phantom III and Wraith models. | 24th Oct 1938 | Box 8 \ 9 09-page42 | |
| Fan blades, comparing the Phantom III and Wraith models. | 29th Oct 1938 | Box 8 \ 9 09-page43 | |
| Internal memorandum discussing a Wraith fan failure and investigating potential causes related to blade clearances. | 15th Nov 1938 | Box 8 \ 9 09-page44 | |
| Successful testing and mandated use of Mobilgrease No. 6 for fans on Wraith and other chassis. | 15th Nov 1938 | Box 8 \ 9 09-page45 | |
| Instruction to fit 'Duralumin' blades to Wraith and B.V. fans and pack Bentley, Wraith and B.V. fans with Mobilgrease No.6. | 25th Nov 1938 | Box 8 \ 9 09-page46 | |
| The delayed fitting of locking plates for the Wraith fan and instructing they be fitted at Depots. | 5th Dec 1938 | Box 8 \ 9 09-page47 | |
| Modification request for the Wraith III 'C' Series fan hub to increase radiator clearance. | 1st Dec 1938 | Box 8 \ 9 09-page48 | |
| Issue with the Wraith fan fouling the radiator bracing stays and proposed modifications. | 20th Dec 1938 | Box 8 \ 9 09-page49 | |
| The modification process for the fan on a Wraith car. | 20th Dec 1938 | Box 8 \ 9 09-page50 | |
| Inadequate clearance between the Wraith fan and the radiator. | 21th Dec 1938 | Box 8 \ 9 09-page51 | |
| Proposed modification to prevent the Wraith fan from fouling the radiator stays for both new and existing chassis. | 22th Dec 1938 | Box 8 \ 9 09-page52 | |
| Issue of the Wraith model's fan fouling the radiator. | 2nd Jan 1939 | Box 8 \ 9 09-page53 | |
| Fan hub modification for Wraith 'A' and 'B' series chassis to increase clearance. | 14th Jan 1939 | Box 8 \ 9 09-page54 | |
| The return of a scrap Wraith fan belt to the supplier, Ferodo Ltd. | 16th Jan 1939 | Box 8 \ 9 09-page55 | |
| Requesting the modification of a standard Wraith fan fitted to engine 30.G.VII. | 21th Jun 1939 | Box 8 \ 9 09-page56 | |
| Secret memo discussing wheelbase and body dimensions for the Wraith model, comparing it to the 20/25. | 18th Sep 1934 | Box 8 \ 10 10-page001 | |
| Dimensions and wheelbase options for the Wraith chassis. | 13th Sep 1934 | Box 8 \ 10 10-page002 | |
| Comparison table of principal chassis dimensions for various car models. | 26th Feb 1936 | Box 8 \ 10 10-page003 | |
| Drawings for the Wraith II chassis layout, frame, transmission and springs. | 26th Feb 1936 | Box 8 \ 10 10-page004 | |
| The proposed layout for the Wraith II frame, mentioning a change from spot welding to bolts in certain areas. | 10th Mar 1936 | Box 8 \ 10 10-page005 | |
| Layout and manufacturing plan for the proposed Wraith II frame. | 10th Mar 1936 | Box 8 \ 10 10-page006 | |
| Revised drawing for the Wraith II chassis frame, its construction, and collaboration with suppliers. | 25th Mar 1936 | Box 8 \ 10 10-page007 | |
| Design and manufacturing specifications for the Wraith II Battery Cross Member. | 8th May 1936 | Box 8 \ 10 10-page008 | |
| Design and construction of the Wraith II frame cross. | 8th May 1936 | Box 8 \ 10 10-page009 | |
| Decision to use a thinner gauge of steel for Wraith II side members to reduce chassis weight. | 8th May 1936 | Box 8 \ 10 10-page010 | |
| Modifications to the Wraith II frame side members to save weight and cost. | 26th May 1936 | Box 8 \ 10 10-page011 | |
| Design and combination of step irons and body brackets for the Wraith II to save weight and expense. | 30th May 1936 | Box 8 \ 10 10-page012 | |
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