| Description | Date | Identifier | |
| From Oy to EFC listing outstanding work to be done on a contact breaker. | 21th Jun 1917 | West Wittering \ A \ June1917 Scan4 | |
| Properties and potential use of Magnalium alloy based on specific gravity and casting tests. | 11th Jun 1917 | West Wittering \ A \ June1917 Scan5 | |
| Pressure drop caused by new R.R.C.H. air inlets and requesting the construction of a larger temporary version for testing. | 13th Jun 1917 | West Wittering \ A \ June1917 Scan6 | |
| Suggesting a 100-hour test for an oil pump annulus made of nickel steel to achieve a specific Brinell figure. | 18th Jun 1917 | West Wittering \ A \ June1917 Scan7 | |
| Requesting an update on the experiments for a larger water pump. | 26th Jun 1917 | West Wittering \ A \ June1917 Scan8 | |
| Requesting an opinion on the efficacy of multi-ringed pistons in relation to oiling. | 27th Jun 1917 | West Wittering \ A \ June1917 Scan9 | |
| Micrometer measurements of a model for a lightened valve rocker. | 27th Jun 1917 | West Wittering \ A \ June1917 Scan10 | |
| Thank you note confirming the satisfactory performance of a new mushroom-shaped valve for aero engines. | 29th Jun 1917 | West Wittering \ A \ June1917 Scan11 | |
| Design and specifications for induction pipe jacket water connections. | 5th May 1917 | West Wittering \ A \ May1917 Scan0 | |
| Design improvements for the rocker arm cover's oil lubrication system. | 10th May 1917 | West Wittering \ A \ May1917 Scan1 | |
| Standardisation of aluminium camshaft casings in either Magnalium or crankchamber alloy for weight saving. | 11th May 1917 | West Wittering \ A \ May1917 Scan2 | |
| Performance and potential design issues with articulated rod pins. | 12th May 1917 | West Wittering \ A \ May1917 Scan3 | |
| The increased tappet clearance for a new camshaft and proposing methods for marking and measuring it. | 14th May 1917 | West Wittering \ A \ May1917 Scan4 | |
| The progress of improved camshaft vertical drives and the desire to fit them as soon as possible. | 14th May 1917 | West Wittering \ A \ May1917 Scan5 | |
| Request for a simple, single-drawer cabinet to hold experimental index cards. | 18th May 1917 | West Wittering \ A \ May1917 Scan6 | |
| Comparative testing of 5/16 inch and 1/2 inch roller bearings and suggesting further high-load tests. | 22th May 1917 | West Wittering \ A \ May1917 Scan7 | |
| Alteration and testing of an articulated rod pin. | 22th May 1917 | West Wittering \ A \ May1917 Scan8 | |
| Failure of a tappet bolt nut to bed squarely and proposing tests with a spherical washer. | 23th May 1917 | West Wittering \ A \ May1917 Scan9 | |
| From 'J' to 'WOR' seeking opinions on a Lanchester Gear Box, considering the difficulty of the existing gearbox. | 23th May 1917 | West Wittering \ A \ May1917 Scan10 | |
| Merits, reliability, and potential adoption or testing of the Lanchester Gear Box. | 23th May 1917 | West Wittering \ A \ May1917 Scan11 | |
| Requesting the standardisation of an Oil Relief Valve Casing made from Piston Brand Aluminium. | 1st Jun 1917 | West Wittering \ A \ May1917 Scan12 | |
| Expressing disagreement with the removal of the extra oil valve spring. | 1st Jun 1917 | West Wittering \ A \ May1917 Scan13 | |
| Requesting standardisation sheets for an aluminium water pump bracket. | 1st Jun 1917 | West Wittering \ A \ May1917 Scan14 | |
| From E. to EFC. requesting to see adjusting washers specified on LeC.710. | 1st May 1917 | West Wittering \ A \ May1917 Scan15 | |
| Mr. Royce's decision to change the milling process for valve rockers. | 10th Nov 1917 | West Wittering \ A \ November1917 Scan0 | |
| Suggesting a modification to the water pump drive worm wheel to facilitate manufacturing. | 10th Nov 1917 | West Wittering \ A \ November1917 Scan1 | |
| Tappet clearance, discussing the non-agreement of fibre washers under camshaft casings and proposing alternative designs. | 12th Nov 1917 | West Wittering \ A \ November1917 Scan2 | |
| Quoting Mr. Royce's questions regarding the design of an annulus gear following recent breakages. | 17th Nov 1917 | West Wittering \ A \ November1917 Scan3 | |
| Suggestion from Hives regarding the running and assembly of old and new articulated joints. | 21th Nov 1917 | West Wittering \ A \ November1917 Scan4 | |
| On a redesigned Fuel Tank Pressure Relief Valve requesting units for experimental testing. | 24th Nov 1917 | West Wittering \ A \ November1917 Scan5 | |
| The testing of connecting rod articulated joints and how to reproduce breakages. | 24th Nov 1917 | West Wittering \ A \ November1917 Scan6 | |
| Potential design issue with a connecting rod joint, comparing it to Falcon and Eagle engines. | 26th Nov 1917 | West Wittering \ A \ November1917 Scan7 | |
| Confirmation of receipt for information and prints concerning B.HP and F.I.A.T. engines. | 26th Nov 1917 | West Wittering \ A \ November1917 Scan8 | |
| Piston clearances, suggesting to engrave or stamp the maximum and minimum values on each piston. | 26th Nov 1917 | West Wittering \ A \ November1917 Scan9 | |
| Potential causes for B.HP engine trouble at Siddeley-Deasy, referencing cooling issues. | 26th Nov 1917 | West Wittering \ A \ November1917 Scan10 | |
| Design changes and testing procedures for a fuel tank pressure relief valve. | 28th Nov 1917 | West Wittering \ A \ November1917 Scan11 | |
| Cancelling previous experiments on the Epicyclic Gear Oldham Coupling, and noting a new anchor plate design to be tested. | 1st Dec 1917 | West Wittering \ A \ November1917 Scan12 | |
| Instruction to standardise the experimental Water Pump Drain Cock with Locking Device. | 3rd Oct 1917 | West Wittering \ A \ October1917 Scan0 | |
| Dalby-Watson Optical Indicator and the availability of an arc lamp for engines. | 3rd Oct 1917 | West Wittering \ A \ October1917 Scan1 | |
| Feasibility of using coal gas as fuel in cars, suggesting methods like compressed gas reservoirs or balloons. | 3rd Oct 1917 | West Wittering \ A \ October1917 Scan2 | |
| Testing of engines without balance weights. | 3rd Oct 1917 | West Wittering \ A \ October1917 Scan3 | |
| Requesting the standardisation of aluminium sling brackets cast with the crankcase. | 13th Oct 1917 | West Wittering \ A \ October1917 Scan4 | |
| Controls and synchronization for magneto and battery ignition systems on 'Falcon' and 'Eagle' engines. | 15th Oct 1917 | West Wittering \ A \ October1917 Scan5 | |
| Letter regarding the dispatch of an R.R. Motor Armature and a 4-volt coil for inspection. | 15th Oct 1917 | West Wittering \ A \ October1917 Scan6 | |
| Request for a set of R.R. feelers to be sent to West Wittering for D.O. and Garage use. | 17th Oct 1917 | West Wittering \ A \ October1917 Scan7 | |
| 260 HP Mercedes 6-cylinder engine and the development of a new 450 hp 12 'V' engine. | 17th Oct 1917 | West Wittering \ A \ October1917 Scan8 | |
| Drawing No. LeC.858 which shows spring diagrams for a shorter valve spring to suit stronger washers. | 4th Sep 1917 | West Wittering \ A \ September1917 Scan0 | |
| Letter to Lieut. Commander Bristow regarding the Watford Magneto and battery ignition systems. | 6th Sep 1917 | West Wittering \ A \ September1917 Scan1 | |
| Letter to Lieut. Commander Bristow of the Air Board regarding design arrangements for a waterproof magneto system. | 8th Sep 1917 | West Wittering \ A \ September1917 Scan2 | |
| Requesting reduced scale photostats of power curves for filing, while full-scale blueprints for Mr. Royce are to continue. | 8th Sep 1917 | West Wittering \ A \ September1917 Scan3 | |
| Proposal to rig and test a loaned 260 HP Mercedes Engine. | 8th Sep 1917 | West Wittering \ A \ September1917 Scan4 | |
| Note suggesting the standardisation of a new wiring tube to save weight per engine. | 13th Sep 1917 | West Wittering \ A \ September1917 Scan5 | |
| Impregnation of aluminium castings with silicate of soda. | 26th Sep 1917 | West Wittering \ A \ September1917 Scan6 | |
| Trial of four Claudel Hobson carburetters on an engine and comparing them to the R.R.C.H. carburetter. | 26th Sep 1917 | West Wittering \ A \ September1917 Scan7 | |
| Instruction to scrap the existing carburetter stays and replace them with steel ones. | 26th Sep 1917 | West Wittering \ A \ September1917 Scan8 | |
| The standardization of rust protection for water pipe clips using copper and nickel plating. | 14th Apr 1918 | West Wittering \ B \ April1918 Scan0 | |
| Outlining a proposed testing procedure for various self-starting motors. | 17th Apr 1918 | West Wittering \ B \ April1918 Scan1 | |
| Technical comparison between a R.R. motor and a Lucas motor, focusing on efficiency, speed, voltage and starting characteristics. | 17th Apr 1918 | West Wittering \ B \ April1918 Scan2 | |
| Performance, testing, and modification of starter motors for car and aero engines. | 17th Apr 1918 | West Wittering \ B \ April1918 Scan3 | |
| Voltage settings and performance curves at specific speeds. | 29th Apr 1918 | West Wittering \ B \ April1918 Scan4 | |
| Suggesting a rig for testing the mechanical strength of crankshafts, similar to one used for pistons. | 29th Apr 1918 | West Wittering \ B \ April1918 Scan5 | |
| Seizing of a water pump gland, recommending different materials for self-lubricating properties. | 3rd Aug 1918 | West Wittering \ B \ August1918 Scan0 | |
| Investigation into the breakage of an annulus, with proposed solutions and manufacturing suggestions. | 13th Aug 1918 | West Wittering \ B \ August1918 Scan1 | |
| Testing alternative materials, like nickel chrome steel, for an annulus and planet gear due to breakage concerns. | 19th Aug 1918 | West Wittering \ B \ August1918 Scan2 | |
| Request to send Mr. Royce a hydrometer for measuring the specific gravity of petrol and battery acid. | 19th Aug 1918 | West Wittering \ B \ August1918 Scan3 | |
| Request for a board with hooks to display specimen springs used in cars and aeroengines. | 28th Aug 1918 | West Wittering \ B \ August1918 Scan4 | |
| Request for three blueprints on thick paper of drawing No. Lec.1037 for a 20 HP small chassis with a four-seater body. | 7th Dec 1918 | West Wittering \ B \ December1918 Scan0 | |
| Deficiencies in the 'Eagle' engine's reduction gear for a proposed trans-atlantic flight and the development of remedies. | 19th Dec 1918 | West Wittering \ B \ December1918 Scan1 | |
| Outlining design improvements for pinion bearings and sunwheel anchorage, including a production timeline. | 30th Dec 1940 | West Wittering \ B \ December1918 Scan2 | |
| Advantages of the 'Eagle' epicyclic gear for a planned Atlantic flight. | 20th Dec 1918 | West Wittering \ B \ December1918 Scan3 | |
| Letter regarding the sending of a drawing for a modified 'Eagle' epicyclic gear. | 21th Dec 1918 | West Wittering \ B \ December1918 Scan4 | |
| Telegram suggesting solutions for broken gears caused by backlash and pre-ignition. | 30th Dec 1918 | West Wittering \ B \ December1918 Scan5 | |
| Optimal composition of valve steel with the addition of Tungsten and Chromium. | 1st Feb 1918 | West Wittering \ B \ February1918 Scan0 | |
| Analysis of a valve failure on test due to a design flaw in a drilled hole. | 2nd Feb 1918 | West Wittering \ B \ February1918 Scan1 | |
| Test results and material modifications for a Friction Controlled Anchor for an Epicyclic gearbox. | 7th Feb 1918 | West Wittering \ B \ February1918 Scan2 | |
| Query regarding the design and proportions of heavy metal springs. | 8th Feb 1918 | West Wittering \ B \ February1918 Scan3 | |
| Design modifications to aluminium camshaft casings based on Mr. Hives' suggestions. | 15th Feb 1918 | West Wittering \ B \ February1918 Scan4 | |
| Telegram reporting a failed bearing cage and distorted annulus gear, recommending replacement. | 19th Feb 1918 | West Wittering \ B \ February1918 Scan5 | |
| Use of a rubber joint and clip for an air pump connection. | 25th Feb 1918 | West Wittering \ B \ February1918 Scan6 | |
| Ideas for the manufacture and design of connecting rods. | 26th Feb 1918 | West Wittering \ B \ February1918 Scan7 | |
| The machining and forging process for connecting rods. | 26th Feb 1918 | West Wittering \ B \ February1918 Scan8 | |
| The machining and heat treatment processes for connecting rods, with supporting hand-drawn sketches. | 26th Feb 1918 | West Wittering \ B \ February1918 Scan9 | |
| Dalby Watson indicator and a patentable method for obtaining an indicator diagram from a fast-running engine. | 5th Jan 1918 | West Wittering \ B \ January1918 Scan0 | |
| Engines with piston rings that have a wide gap. | 1st Jan 1918 | West Wittering \ B \ January1918 Scan1 | |
| Use of laminated shim metal for liners in crankshaft bearings and connecting rods. | 7th Jan 1918 | West Wittering \ B \ January1918 Scan2 | |
| Proposing a simpler indicator scheme to avoid issues with the Dalby-Watson model. | 9th Jan 1918 | West Wittering \ B \ January1918 Scan3 | |
| Planet bearings with threads, clarifying design intentions regarding tightness and its effect on part diameter, and suggesting experimental testing. | 12th Jan 1918 | West Wittering \ B \ January1918 Scan4 | |
| Message from Royce regarding the results of a steel comparison. | 10th Jan 1918 | West Wittering \ B \ January1918 Scan5 | |
| Clarifying the use of the standard washer for new valve springs. | 14th Jan 1918 | West Wittering \ B \ January1918 Scan6 | |
| The permissible slack for the Slack Pump Gear, setting maximum and minimum clearances. | 17th Jan 1918 | West Wittering \ B \ January1918 Scan7 | |
| Clarifying a suggestion about using thin aluminium sheet metal to melt into piston castings. | 17th Jan 1918 | West Wittering \ B \ January1918 Scan8 | |
| Improvement to Plain Ends Planet Gears, including confirmation testing and specific dimensional recommendations. | 18th Jan 1918 | West Wittering \ B \ January1918 Scan9 | |
| Query regarding permission to use the latest type of primer. | 17th Jan 1918 | West Wittering \ B \ January1918 Scan10 | |
| The advantages of lower carbon 'Quick Step' steel for valves. | 7th Jan 1918 | West Wittering \ B \ January1918 Scan11 | |
| Keeping note of and applying extra tolerances and clearances from Mr. Hives' memos. | 18th Jan 1918 | West Wittering \ B \ January1918 Scan12 | |
| End clearance dimensions for serrated wedge type valve spring washers. | 21th Jan 1918 | West Wittering \ B \ January1918 Scan13 | |
| Burning of exhaust valves and the suggestion to update the instruction book. | 23th Jan 1918 | West Wittering \ B \ January1918 Scan14 | |
| Use of copper versus steel rivets for exhaust trunk pipes and suggesting spot welding as an alternative. | 24th Jan 1918 | West Wittering \ B \ January1918 Scan15 | |
| Experiment 3250, expressing concerns about the danger of the bolt material and suggesting a spring-tempered alternative. | 28th Jan 1918 | West Wittering \ B \ January1918 Scan16 | |
| Process of broaching the big end of a connecting rod. | 28th Jan 1918 | West Wittering \ B \ January1918 Scan17 | |
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