| Description | Date | Identifier | |
| Vehicle's mileage, an inquiry about its future use, and recent mechanical faults. | 18th May 1922 | Box 180 \ M2 \ M2.1 img024 | |
| The poor quality and failure of fan belts on three cars, and a broken thermometer. | 19th May 1922 | Box 180 \ M2 \ M2.1 img025 | |
| The issue of fixing springs to the front axle, specifically regarding loose clips on Goshawk-11 and 40/50 models. | 19th May 1922 | Box 180 \ M2 \ M2.1 img026 | |
| The disadvantages of the Goshawk 11 spring fixing design and a noted fault. | 20th May 1922 | Box 180 \ M2 \ M2.1 img027 | |
| Telegram reporting cracked exhaust seats on a Goshawk engine and requesting a new cylinder head. | 20th May 1922 | Box 180 \ M2 \ M2.1 img028 | |
| Letter detailing engine trouble, including valve issues and a cracked cylinder head, and confirming an order for a replacement part. | 20th May 1922 | Box 180 \ M2 \ M2.1 img029 | |
| Multiple vehicle faults including a cracked valve seat, cracked front cross member, and loose axle components. | 20th May 1922 | Box 180 \ M2 \ M2.1 img030 | |
| Pitted distributor LT contact and a summary of mileage covered. | 15th Feb 1922 | Box 180 \ M2 \ M2.1 img031 | |
| Recurring cracked cylinder head issue and a cracked front cross member on a Goshawk-11 vehicle. | 15th Feb 1922 | Box 180 \ M2 \ M2.1 img032 | |
| Requesting instructions for modifications to a cross member which has failed after 10,000 miles. | 23th May 1922 | Box 180 \ M2 \ M2.1 img033 | |
| Correspondence detailing vehicle repairs, including a cylinder head replacement and chassis examination. | 23th May 1922 | Box 180 \ M2 \ M2.1 img034 | |
| Report detailing adjustments to pressure, springs, and observations on tyre wear after 1000 miles. | 24th May 1922 | Box 180 \ M2 \ M2.1 img035 | |
| Letter discussing travel arrangements for a car and driver, and responding to a query about water loss. | 24th May 1922 | Box 180 \ M2 \ M2.1 img036 | |
| Investigation into engine misfiring, attributing it to sticky/leaking valves and bad points, and arranging for a 40/50 model for comparison. | 1st May 1922 | Box 180 \ M2 \ M2.1 img037 | |
| Examination of the Goshawk cylinder head, comparing it to a Marson car and detailing observed failures. | 1st May 1922 | Box 180 \ M2 \ M2.1 img038 | |
| The cooling system tests of a Goshawk engine, noting issues with water loss upon boiling. | 28th May 1922 | Box 180 \ M2 \ M2.1 img039 | |
| Letter detailing issues encountered while fitting a new cylinder head and a query about a leaking battery and a CAV dynamo alteration. | 28th May 1922 | Box 180 \ M2 \ M2.1 img040 | |
| Logistics and oil consumption issues for vehicles 79H, 69H, and 64H. | 27th Mar 1929 | Box 180 \ M2 \ M2.1 img041 | |
| Letter to Mr. Royce regarding production decisions for the 20 HP chassis and the new turbulent head engine. | 27th Mar 1929 | Box 180 \ M2 \ M2.1 img042 | |
| Engine and chassis development, specifically regarding the 'turbulent head'. | 1st Apr 1928 | Box 180 \ M2 \ M2.1 img043 | |
| Increasing the 20 HP model's performance and redesigning its engine to suit modern requirements. | 1st Apr 1928 | Box 180 \ M2 \ M2.1 img044 | |
| Increasing the engine size of the 20 HP model for better performance against competitors. | 1st Apr 1928 | Box 180 \ M2 \ M2.1 img045 | |
| Page discussing engine compression, speeds, and carburetter restriction. | 1st Apr 1928 | Box 180 \ M2 \ M2.1 img046 | |
| Letter from F. H. Royce outlining production limits and improvements for the 20 HP model due to poor sales. | 4th Apr 1929 | Box 180 \ M2 \ M2.1 img047 | |
| From F. H. Royce discussing future policy on engine and body size for car models. | 26th Jul 1918 | Box 180 \ M2 \ M2.1 img048 | |
| Mr. Royce's feedback on proposals for crankshaft and piston testing procedures. | 26th Jul 1918 | Box 180 \ M2 \ M2.1 img049 | |
| Examination of the Packard car's petrol tank design, with a diagram illustrating its reserve compartment system. | 1st Aug 1920 | Box 180 \ M2 \ M2.1 img050 | |
| From the Managing Director enclosing information on the 20 HP chassis for a Director's meeting. | 12th Apr 1929 | Box 180 \ M2 \ M2.2 img001 | |
| Letter from A.F. Sidgreaves to Lord Wargrave regarding a board meeting and the 20 HP Chassis. | 12th Apr 1929 | Box 180 \ M2 \ M2.2 img002 | |
| Notes on the decision-making process for a further batch of 200 20 HP chassis, including discussions on modifications and specifications. | 12th Apr 1929 | Box 180 \ M2 \ M2.2 img003 | |
| Production strategy for the 20 HP chassis, covering sales, modifications, and financial implications. | 12th Apr 1929 | Box 180 \ M2 \ M2.2 img004 | |
| Notes on the 20 HP chassis, comparing power-to-weight ratios with other models and competitor cars. | 12th Apr 1929 | Box 180 \ M2 \ M2.2 img005 | |
| Notes on the chassis and bodywork policies for the 20 HP model, including arrangements with coachbuilders and weight limitations. | 12th Apr 1929 | Box 180 \ M2 \ M2.2 img006 | |
| Notes on the 20 HP Chassis regarding increased weight from bodies and accessories, and the commercial impact of 6-seater models. | 12th Apr 1919 | Box 180 \ M2 \ M2.2 img007 | |
| Internal notes discussing performance issues and proposed modifications for the 20 HP Chassis. | 1st Apr 1929 | Box 180 \ M2 \ M2.2 img008 | |
| Notes regarding recommendations for 20 HP chassis production, modifications, and sales strategy. | 12th Apr 1929 | Box 180 \ M2 \ M2.2 img009 | |
| Future electrical equipment, including lamps for an earthed wiring scheme and the adoption of a Smith dynamo. | 26th Jul 1920 | Box 180 \ M2 \ M2.3 img001 | |
| Different proposed electrical wiring schemes, comparing combined and separate components like cut-outs and junction boxes. | 26th Jul 1920 | Box 180 \ M2 \ M2.3 img002 | |
| Alternative designs for a distribution board, considering earthed and non-earthed systems. | 26th Jul 1920 | Box 180 \ M2 \ M2.3 img003 | |
| Smith dynamo and cut-out arrangements and a query regarding battery earthing connections on an earthed wiring scheme. | 26th Jul 1920 | Box 180 \ M2 \ M2.3 img004 | |
| The method for making earth connections in an electrical system. | 26th Jul 1920 | Box 180 \ M2 \ M2.3 img005 | |
| Hand-drawn block diagram of a non-earthed automotive electrical system, designated as the 'Present Standard'. | 19th Feb 1920 | Box 180 \ M2 \ M2.3 img006 | |
| Block diagram of a suggested non-earthed electrical circuit. | 12th Feb 1926 | Box 180 \ M2 \ M2.3 img007 | |
| Block diagram of a non-earthed vehicle electrical system. | 12th Feb 1926 | Box 180 \ M2 \ M2.3 img008 | |
| Hand-drawn wiring diagram for a non-earthed electrical system. | 19th Feb 1920 | Box 180 \ M2 \ M2.3 img009 | |
| Hand-drawn block diagram showing a vehicle's electrical distribution system. | 19th Feb 1920 | Box 180 \ M2 \ M2.3 img010 | |
| Analysis and testing report on sylphon tubes for thermostats. | 24th Mar 1920 | Box 180 \ M2 \ M2.3 img011 | |
| Updated instructions for the care and first charge of accumulators following a visit from the Chloride Electrical Storage Co. | 10th Mar 1920 | Box 180 \ M2 \ M2.3 img012 | |
| Instructions on accumulator charging, acid changes, and acid density for celluloid and ebonite types. | 10th Mar 1920 | Box 180 \ M2 \ M2.3 img013 | |
| Page discussing the effects of acid density and the optimal proportion of acid to plates in celluloid batteries. | 10th Mar 1920 | Box 180 \ M2 \ M2.3 img014 | |
| The correct acid level and storage procedures for batteries. | 10th Mar 1920 | Box 180 \ M2 \ M2.3 img015 | |
| Instructions for packing batteries for shipment and charging new, unfilled batteries with wood separators. | 10th Mar 1920 | Box 180 \ M2 \ M2.3 img016 | |
| Procedure for the first discharge and recharge of a new battery. | 10th Mar 1920 | Box 180 \ M2 \ M2.3 img017 | |
| Sensitivity and testing of Bijur vibrator voltage and current regulators. | 26th Jul 1920 | Box 180 \ M2 \ M2.3 img018 | |
| The adoption of a regulation system for American-built chassis, recommending the Smith dynamo four-brush system. | 26th Jul 1920 | Box 180 \ M2 \ M2.3 img019 | |
| Meeting with Mr. Joseph Bijur to discuss Bijur starting and dynamo lighting systems for aero and car engines. | 17th Aug 1920 | Box 180 \ M2 \ M2.3 img020 | |
| Mr. Bijur's proposal for supplying 6-volt electrical equipment, comparing it to 12-volt systems. | 17th Aug 1920 | Box 180 \ M2 \ M2.3 img021 | |
| The merits of 6-volt versus 12-volt starter systems and an arrangement to inspect a Bijur apparatus. | 17th Aug 1920 | Box 180 \ M2 \ M2.3 img022 | |
| The merits of third brush control versus vibrator control systems in American cars. | 17th Aug 1920 | Box 180 \ M2 \ M2.3 img023 | |
| The merits of 6-volt versus 12-volt car electrical systems, with reference to Bijur apparatus. | 17th Aug 1920 | Box 180 \ M2 \ M2.3 img024 | |
| The erratic performance of an experimental 12-volt Bijur dynamo and regulator compared to the standard 6-volt system. | 17th Aug 1920 | Box 180 \ M2 \ M2.3 img025 | |
| Comparison of 12-volt versus 6-volt vibrator regulator systems and dynamo overloading issues. | 17th Aug 1920 | Box 180 \ M2 \ M2.3 img026 | |
| The specifications of a 6-cylinder Delage car chassis and engine. | 23th Jul 1920 | Box 180 \ M2 \ M2.4 img001 | |
| Engine performance report detailing issues with over-oiling, noisy valve gear, vibration, and weakness at low speeds. | 23th Jul 1920 | Box 180 \ M2 \ M2.4 img002 | |
| Engine performance shown in a table of RPM vs HP, and a detailed description of the car's electrical equipment. | 23th Jul 1920 | Box 180 \ M2 \ M2.4 img003 | |
| Vehicle's multi-plate clutch, four-speed gearbox ratios, and braking system. | 23th Jul 1920 | Box 180 \ M2 \ M2.4 img004 | |
| Brake system tests, including a comparison with a Delage vehicle. | 23th Jul 1920 | Box 180 \ M2 \ M2.4 img005 | |
| Brake performance tests, including tables of stopping distances and qualitative analysis. | 1st Jul 1920 | Box 180 \ M2 \ M2.4 img006 | |
| The back axle, steering, chassis, and consumption tests of a car. | 23th Jul 1920 | Box 180 \ M2 \ M2.4 img007 | |
| General conclusion on vehicle testing, focusing on braking systems, tyre wear, and petrol feed problems. | 23th Jul 1920 | Box 180 \ M2 \ M2.4 img008 | |
| Reasons for not fitting or recommending Rapson tyres. | 16th Dec 1920 | Box 180 \ M2 \ M2.4 img009 | |
| Recommendation against using certain vehicles or components for heavy work on the standard touring car. | 16th Dec 1920 | Box 180 \ M2 \ M2.4 img010 | |
| Final decided method for handling experimental work processes and drawing distribution. | 11th Jun 1917 | Box 180 \ M2 \ M2.4 img011 | |
| Instructions for the distribution of casting prints and the processing of parts. | 11th Jun 1917 | Box 180 \ M2 \ M2.4 img012 | |
| Document outlining the procedural steps for part standardization and production between various departments. | 11th Jun 1917 | Box 180 \ M2 \ M2.4 img013 | |
| Memorandum detailing procedures for experimental work and part standardisation. | 16th Oct 1919 | Box 180 \ M2 \ M2.4 img014 | |
| Improvement of anchoring springs under the axle and the necessity of shock absorbers. | 16th Oct 1919 | Box 180 \ M2 \ M2.4 img015 | |
| 'V' series car being tested in France, detailing several serious faults discovered. | 1st May 1928 | Box 180 \ M2 \ M2.4 img016 | |
| From 'R' proposing the fitment of a Beatonson all-weather head to a 40/50 car. | 29th Jan 1925 | Box 180 \ M2 \ M2.4 img017 | |
| Sketches and notes on alternative piston designs, including split and pad types. | 18th Oct 1919 | Box 180 \ M2 \ M2.4 img018 | |
| The development, testing, and proposed modifications for shock absorbers on standard cars. | 16th Oct 1919 | Box 180 \ M2 \ M2.4 img019 | |
| Tests conducted to resolve piston knock issues using different oil pressure schemes. | 17th Oct 1919 | Box 180 \ M2 \ M2.4 img020 | |
| Various tests to resolve piston knock, including adjusting oil pressure and modifying piston design. | 17th Oct 1919 | Box 180 \ M2 \ M2.4 img021 | |
| Piston clearance, cold-engine knock, and testing with a stroboscopic telephone. | 1st Apr 1921 | Box 180 \ M2 \ M2.4 img022 | |
| Requesting an investigation into adapting third-party starter motors for the 'Goshawk II' engine and forwarding dynamo particulars to Rotax. | 1st Apr 1921 | Box 180 \ M2 \ M2.4 img023 | |
| Mr. Royce's remarks on the design of the Goshawk I and II front shock absorber. | 21th Mar 1931 | Box 180 \ M2 \ M2.4 img024 | |
| Specifying the design for an adjusting screw on ball joints and increasing the load on a shock absorber arm. | 8th Mar 1921 | Box 180 \ M2 \ M2.4 img025 | |
| Drawing Lec.1367 for a petrol tank, including proposed modifications by Mr. Royce for the 'Goshawk II'. | 17th Mar 1921 | Box 180 \ M2 \ M2.4 img026 | |
| Viability of manufacturing starter motors and dynamos for the 'Goshawk II'. | 5th Apr 1921 | Box 180 \ M2 \ M2.4 img027 | |
| The 'Goshawk II' Petrol Tank, sending drawing LeC.1370 and confirming the pattern to be used. | 31th Mar 1921 | Box 180 \ M2 \ M2.4 img028 | |
| Halting work on an over-head camshaft 'Vulture' cylinder head in favor of a push rod mechanism. | 17th Nov 1920 | Box 180 \ M2 \ M2.4 img029 | |
| Modifications to the 'Vulture' engine design and comparing it with the 'Buzzard' engine for a new large chassis. | 17th Nov 1920 | Box 180 \ M2 \ M2.4 img030 | |
| Proposal for a hot spot induction system to improve fuel vaporization and distribution in cold weather. | 15th Dec 1920 | Box 180 \ M2 \ M2.4 img031 | |
| Comparative test measuring the velocity of air passing through the radiator on the 40/50 and the Goshawk II models. | 30th May 1922 | Box 180 \ M2 \ M2.4 img032 | |
| Tests on the Goshawk engine to reduce water loss, including different cooling system configurations and fan performance. | 30th May 1922 | Box 180 \ M2 \ M2.4 img033 | |
| Engine overheating, detonation, and thermometer accuracy in the 40/50 and Goshawk engines. | 30th May 1922 | Box 180 \ M2 \ M2.4 img034 | |
| Test report on a Goshawk II engine's cooling system performance with boiling water. | 5th May 1938 | Box 180 \ M2 \ M2.4 img035 | |
| Note on engine performance, specifically running at 2160 revs while boiling for half an hour. | 5th May 1938 | Box 180 \ M2 \ M2.4 img036 | |
| Policy for fitting American parts to R-R chassis, contrasting the principle of using the best parts versus locally available spares. | 16th Jul 1920 | Box 180 \ M2 \ M2.5 img001 | |
| Internal discussion comparing the in-house R-R motor with the third-party Bijur motor for use in their cars. | 16th Jul 1920 | Box 180 \ M2 \ M2.5 img002 | |
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