| Description | Date | Identifier | |
| Advising to continue with the current scheme for 20 HP Chassis front wheel brake damping segments pending a 10,000-mile test. | 8th Mar 1930 | Box 5 \ 3 03-page287 | |
| Suggesting a smaller rivet head for narrow brake shoes on the 20 HP hand brake. | 27th Mar 1930 | Box 5 \ 3 03-page288 | |
| Standardisation of a brake clank silencer and stop for front brake ropes. | 8th Apr 1930 | Box 5 \ 3 03-page289 | |
| Advising the fitting of a non-return type gun nipple to axles on 20 HP and 40/50 HP models to maintain oil pressure. | 13th May 1929 | Box 5 \ 3 03-page290 | |
| Enquiry into missing wooden plugs fitted inside the rear brake toggle shaft on the 20 HP model. | 14th May 1929 | Box 5 \ 3 03-page291 | |
| Instructions regarding the carburetter, induction pipe, and petrol feed for the Goshawk chassis. | 10th Feb 1920 | Box 5 \ 4 04-page001 | |
| Dispatching two blueprints for 'A' Scheme 574, showing an initial arrangement of the 'Goshawk' carburetter and induction pipes. | 26th Oct 1920 | Box 5 \ 4 04-page002 | |
| Scheme for temporary Goshawk carburettor controls. | 26th Oct 1920 | Box 5 \ 4 04-page003 | |
| Modifications to the carburetter throats of a Goshawk engine. | 17th Dec 1920 | Box 5 \ 4 04-page004 | |
| Experiments to determine the correct proportions for Goshawk engine carburettor throats. | 17th Dec 1920 | Box 5 \ 4 04-page005 | |
| Preliminary report on the road behaviour of the 'Goshawk' chassis. | 1st Jan 1921 | Box 5 \ 4 04-page006 | |
| Title page for the Goshawk II. | 17th Nov 1920 | Box 5 \ 4 04-page007 | |
| Use of a scaled-down carburetter for a new small chassis to save time. | 17th Nov 1920 | Box 5 \ 4 04-page008 | |
| Extract detailing design updates for the HE Goshawk II engine, including cylinder heads, ignition, and induction systems. | 18th Jan 1931 | Box 5 \ 4 04-page009 | |
| Extract from a visit report regarding carburetter designs for the Goshawk 11 and an experimental setup for the 40/50 HP chassis. | 31th Mar 1921 | Box 5 \ 4 04-page010 | |
| The Goshawk II carburetter, its drawing, and a proposed hot air supply system using radiator shutters. | 5th May 1921 | Box 5 \ 4 04-page011 | |
| Gasket options for the 'Goshawk II' carburettor to cylinder block joint. | 24th May 1921 | Box 5 \ 4 04-page012 | |
| Hill climb test of an exhaust heated throttle shutter on a 40/50 chassis. | 14th Jul 1921 | Box 5 \ 4 04-page013 | |
| Carburetter modifications for the Goshawk 11 engine, including the float chamber, throats, and air valve. | 14th Sep 1921 | Box 5 \ 4 04-page014 | |
| Technical memorandum discussing modifications to the carburetter, a Goshawk switch, the starting handle, and other fittings. | 14th Sep 1921 | Box 5 \ 4 04-page015 | |
| Modifications to the rear tank, dynamo, auto-vac, springs, and exhaust system. | 9th Sep 1921 | Box 5 \ 4 04-page016 | |
| Technical note discussing the fan blades, radiator shutters, and undershield. | 14th Sep 1921 | Box 5 \ 4 04-page017 | |
| Drawing LeC.1448 for the Goshawk 11 carburetter, specifically the larger float chamber and a revised petrol strainer cover. | 16th Sep 1921 | Box 5 \ 4 04-page018 | |
| Revisions to the Goshawk II carburetter, specifically modifications to the jets to prevent flooding on gradients. | 26th Sep 1933 | Box 5 \ 4 04-page019 | |
| Telegram from Elliott to Roycar Derby regarding slow running and low speed jets for starting. | 29th Oct 1929 | Box 5 \ 4 04-page020 | |
| The Goshawk 11 carburetter, addressing slow running issues and comparing different jet and throttle types. | 5th Oct 1921 | Box 5 \ 4 04-page021 | |
| Confirmation of a telegram regarding engine noise reduction and scheduling of comparisons. | 7th Oct 1921 | Box 5 \ 4 04-page022 | |
| Extract regarding the design of a pilot jet and a silencer for the Goshawk carburetter. | 8th Oct 1921 | Box 5 \ 4 04-page023 | |
| Telegram regarding a modified scheme for the Goshawk two carburetter setup. | 12th Jun 1931 | Box 5 \ 4 04-page024 | |
| Alterations to the Goshawk 11 carburetter for silencing and control. | 11th Oct 1921 | Box 5 \ 4 04-page025 | |
| To halt production of current carburetter castings and propose designing a simpler, new version. | 10th Oct 1921 | Box 5 \ 4 04-page026 | |
| Modifications to the Goshawk II carburettor. | 14th Oct 1921 | Box 5 \ 4 04-page027 | |
| Modifications to the Goshawk 11 carburetter to address a noisy intake and float chamber issues. | 17th Oct 1931 | Box 5 \ 4 04-page028 | |
| Letter discussing carburetter jet adjustments, slow running, and the redesign of a butterfly throttle control. | 19th Oct 1921 | Box 5 \ 4 04-page029 | |
| Blueprint for the Goshawk 11 carburetter, detailing modifications, a silencer trial, and design features. | 19th Oct 1921 | Box 5 \ 4 04-page030 | |
| New silencer design and modified control gear for the Goshawk II engine, referencing drawings LeC.1467 and LeC.1474. | 29th Oct 1921 | Box 5 \ 4 04-page031 | |
| Requesting instructions on the specifications for five Goshawk II carburetters for a Works' chassis. | 4th Nov 1921 | Box 5 \ 4 04-page032 | |
| Replacement of problematic cracking and leaking fibre washers with continental micarta on various components. | 29th Dec 1921 | Box 5 \ 4 04-page033 | |
| Criticisms of the Goshawk carburetter with silencer, particularly its noise level, and proposing modifications. | 12th Aug 1921 | Box 5 \ 4 04-page034 | |
| Accompanying a blueprint for a 'Goshawk II' carburetter, detailing a raised petrol level. | 3rd Mar 1922 | Box 5 \ 4 04-page035 | |
| Blueprint for the Goshawk II engine showing a modification to raise the petrol level. | 2nd Mar 1932 | Box 5 \ 4 04-page036 | |
| Extract discussing a carburetter modification to increase damping on the air valve. | 7th Mar 1922 | Box 5 \ 4 04-page037 | |
| Requesting a recommendation for a Goshawk II carburetter spring and a list of production modifications. | 7th Mar 1922 | Box 5 \ 4 04-page038 | |
| The Goshawk II carburetter float weight and petrol level. | 7th Mar 1922 | Box 5 \ 4 04-page039 | |
| Suggestion to test the Goshawk 11 carburetter on the exhaust side of the engine to improve pulling at low speeds. | 17th Mar 1922 | Box 5 \ 4 04-page040 | |
| Carburetter throat sizes and air valve specifications for the Goshawk 11. | 13th Apr 1932 | Box 5 \ 4 04-page041 | |
| Carburetter quantities, air valves, and springs, comparing a 40/50 model to a Goshawk-11 for a 55 HP engine. | 19th Apr 1922 | Box 5 \ 4 04-page042 | |
| Issues with petrol filters on a G-Goshawk-11 carburetter due to a blockage by fine silt. | 19th Apr 1922 | Box 5 \ 4 04-page043 | |
| Adapting a 40/50 carburetter for the Goshawk 11 engine, based on calculations and Mr. Royce's instructions. | 20th Apr 1922 | Box 5 \ 4 04-page044 | |
| Drawing for a larger air valve for the Goshawk 11 carburetter. | 25th Apr 1922 | Box 5 \ 4 04-page045 | |
| Vacuum figures and air valve diameter for the Goshawk 11 carburetter. | 25th Apr 1922 | Box 5 \ 4 04-page046 | |
| The Goshawk 11 starting carburetter and mixture control, detailing modifications to avoid fouling the Klaxon horn. | 10th May 1922 | Box 5 \ 4 04-page047 | |
| Design changes to the Goshawk 11 carburetter controls. | 22th May 1922 | Box 5 \ 4 04-page048 | |
| Experimental modifications to the Goshawk 11 carburetter air valve. | 23th May 1922 | Box 5 \ 4 04-page049 | |
| Modifications for the Goshawk carburetter, including petrol level and needle adjustments. | 20th Jun 1930 | Box 5 \ 4 04-page050 | |
| Continued document discussing a standard modification for a 2.BA box spanner. | 29th Jun 1922 | Box 5 \ 4 04-page051 | |
| Advantages of the adjusting needle for the pilot jet on the Goshawk carburetter. | 29th Jun 1922 | Box 5 \ 4 04-page052 | |
| The Goshawk engine's performance issues and proposals for future design tests. | 23th Jun 1922 | Box 5 \ 4 04-page053 | |
| The re-arrangement of the Goshawk throttle control to address complaints of poor delicate control. | 1st Jun 1922 | Box 5 \ 4 04-page054 | |
| Alteration to the pilot jet adjusting needle on a Goshawk carburetter, following a report by Mr. Hives. | 29th Jun 1922 | Box 5 \ 4 04-page055 | |
| The adoption of a glass window in the Goshawk carburetter's float chamber. | 3rd Jul 1922 | Box 5 \ 4 04-page056 | |
| The difficulty in achieving sensitive control for the Goshawk throttle and a proposed modification. | 1st Jul 1922 | Box 5 \ 4 04-page057 | |
| Adoption of a glass window for the Goshawk Carburetter float chamber as standard. | 7th Jul 1922 | Box 5 \ 4 04-page058 | |
| Mr. Royce's requests for Goshawk carburetter parts and information. | 29th Jul 1922 | Box 5 \ 4 04-page059 | |
| Instructions detailing throttle gap measurements for the Goshawk II engine. | 9th Jul 1935 | Box 5 \ 4 04-page060 | |
| Modifying the Goshawk II throttle control for smoother operation on a limousine. | 9th Jul 1932 | Box 5 \ 4 04-page061 | |
| Continuation of a report on throttle lever and butterfly valve adjustments and testing results. | 20th Jul 1922 | Box 5 \ 4 04-page062 | |
| The dispatch of blueprints for 'Goshawk II' carburetter parts for an experimental set. | 20th Jul 1922 | Box 5 \ 4 04-page063 | |
| Request for Goshawk carburetter cone jets, proposing to send a complete new carburetter instead. | 24th Jul 1922 | Box 5 \ 4 04-page064 | |
| Instructions from Mr. Royce regarding the installation of induction pipes, exhaust pipes, and carburetter for the Goshawk-1 engine. | 25th Jul 1922 | Box 5 \ 4 04-page065 | |
| Carburetter alterations for Goshawk-11 patterns and a directive from Mr. Royce. | 26th Jul 1922 | Box 5 \ 4 04-page066 | |
| Tests on Goshawk 11 induction pipes regarding fuel distribution and performance with inferior petrol. | 26th Jul 1922 | Box 5 \ 4 04-page067 | |
| Carburettor tests with various fuels to diagnose hesitation and performance issues on Goshawk and 40/50 HP models. | 26th Jul 1922 | Box 5 \ 4 04-page068 | |
| Carburetter testing to diagnose engine hesitation and weakness related to the air valve and high-speed jet. | 27th Jul 1932 | Box 5 \ 4 04-page069 | |
| Modifications to the Goshawk throttle and carburetter. | 27th Jul 1932 | Box 5 \ 4 04-page070 | |
| Carburation schemes for Goshawk and Condor engines, including sketches. | 28th Jul 1922 | Box 5 \ 4 04-page071 | |
| Modification to Goshawk II carburettor floats to prevent production delays. | 16th Aug 1922 | Box 5 \ 4 04-page072 | |
| Requesting confirmation on carburetter float specifications for the Goshawk II engine. | 19th Aug 1922 | Box 5 \ 4 04-page073 | |
| Extract detailing carburetter and ignition issues on a Goshawk-II engine. | 1st Aug 1922 | Box 5 \ 4 04-page074 | |
| Telegram received by telephone regarding the supply of carburettor parts and data. | 29th Sep 1922 | Box 5 \ 4 04-page075 | |
| Telegram received by telephone with a handwritten instruction from Royce. | 9th May 1924 | Box 5 \ 4 04-page076 | |
| Letter from The 'TRIAT' Carburettor Company proposing their patented carburettor for a new car model. | 4th Oct 1922 | Box 5 \ 4 04-page077 | |
| Blueprint for an experimental governor control arrangement on a carburettor for the 40/50 HP (Phantom I) chassis. | 17th May 1915 | Box 5 \ 4 04-page078 | |
| Blueprint showing the arrangement of an L.B. Cylinder to accommodate a new valve. | 17th May 1915 | Box 5 \ 4 04-page079 | |
| Modification to the Goshawk 11+ carburetter air valve, with a suggestion from Mr. Royce for further improvement. | 24th Oct 1922 | Box 5 \ 4 04-page080 | |
| Trial of lead or leather washers to prevent cracking in the Goshawk II carburetter float level window. | 21th Dec 1922 | Box 5 \ 4 04-page081 | |
| Agreeing to increase the weight of the Goshawk 11 carburetter float by three drams. | 28th Dec 1922 | Box 5 \ 4 04-page082 | |
| Instructing to fix a stuck air valve on a carburetter. | 10th Jan 1923 | Box 5 \ 4 04-page083 | |
| Requesting an update on steps to reduce carburettor whistling on a 20 HP car. | 24th Jan 1923 | Box 5 \ 4 04-page084 | |
| Tests to reduce carburettor noise on the 20 HP model. | 2nd Oct 1928 | Box 5 \ 4 04-page085 | |
| Investigation into carburetter noise, specifically a whistling sound at certain speeds. | 2nd Feb 1923 | Box 5 \ 4 04-page086 | |
| Carburetter noise, comparing different types of throttle valves. | 5th Feb 1923 | Box 5 \ 4 04-page087 | |
| Investigation into the cause of carburettor whistling on a Goshawk-11 engine. | 5th Feb 1923 | Box 5 \ 4 04-page088 | |
| Investigation into curing a low speed whistle and suction noise from a carburettor. | 5th Feb 1923 | Box 5 \ 4 04-page089 | |
| Investigation into the cause and remedy for a whistling carburetter on a Goshawk-11 engine. | 5th Feb 1923 | Box 5 \ 4 04-page090 | |
| Investigation into curing low-speed whistle and suction noise in a carburetter. | 5th Feb 1923 | Box 5 \ 4 04-page091 | |
| Investigation into a whistling carburetter on a Goshawk II engine. | 5th Feb 1923 | Box 5 \ 4 04-page092 | |
| Investigation into the cause of a whistling noise from a G.U. carburettor. | 5th Feb 1923 | Box 5 \ 4 04-page093 | |
| Notes on modifying a carburettor needle and diffuser to cure whistling and suction noise. | 5th Feb 1923 | Box 5 \ 4 04-page094 | |
| Materials for petrol joints on the 20 HP carburetter, proposing cork or leather as superior alternatives to fibre. | 2nd Feb 1923 | Box 5 \ 4 04-page095 | |
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