| Description | Date | Identifier | |
| Tests conducted on Champion sparking plugs, types AE.4, AE.9, and AE.1. | 23th Mar 1928 | Box 35 \ 3 scan 201 | |
| Letter from Champion Sparking Plug Co. Ltd. regarding a new World's Air Speed Record achieved with their aero plugs. | 4th Apr 1928 | Box 35 \ 3 scan 202 | |
| Letter from the Air Ministry forwarding a report on the failure of Champion Sparking Plugs. | 12th Apr 1928 | Box 35 \ 3 scan 203 | |
| Investigation into the cause of failure of Champion sparking plugs removed from a Falcon XI engine using doped fuel. | 17th Mar 1928 | Box 35 \ 4 scan 001 | |
| Summary page discussing irreversible changes in spark plug conductivity and proposing further engine tests. | 17th Mar 1928 | Box 35 \ 4 scan 002 | |
| The failure of Champion sparking plugs from a Falcon XI engine using doped fuel. | 17th Mar 1928 | Box 35 \ 4 scan 003 | |
| The inspection and testing procedures for engine spark plugs. | 17th Mar 1928 | Box 35 \ 4 scan 004 | |
| Results of spark plug measurements at atmospheric temperature, including a table of values and analysis. | 17th Mar 1928 | Box 35 \ 4 scan 005 | |
| The testing of plug insulation resistance at high temperatures and pressures. | 17th Mar 1928 | Box 35 \ 4 scan 006 | |
| Test report on spark plug insulation resistance and sparking characteristics after heating and cooling, followed by engine tests. | 17th Mar 1928 | Box 35 \ 4 scan 007 | |
| General comments and conclusions from an investigation into spark plug performance and failure, particularly with doped fuel. | 12th Mar 1928 | Box 35 \ 4 scan 008 | |
| Cross-sectional drawing of a Champion R11.V sparking plug showing its components. | 12th Mar 1928 | Box 35 \ 4 scan 009 | |
| Graph of regular sparking voltage versus temperature for a Champion R-II-V sparking plug from a Falcon XI engine. | 19th Mar 1925 | Box 35 \ 4 scan 010 | |
| Graph showing the increase of available plug voltage due to the increase of temperature for a Champion Sparking Plug, Type R-II-V, from a Falcon XI engine. | 19th Mar 1928 | Box 35 \ 4 scan 011 | |
| Graph showing the relationship between temperature and effective insulation resistance for a Champion R-11-V sparking plug. | 19th Mar 1928 | Box 35 \ 4 scan 012 | |
| Graph showing the effective insulation resistance versus temperature for a Champion R-II-V sparking plug. | 19th Mar 1928 | Box 35 \ 4 scan 013 | |
| Specifications for new designs of 40/50 and Goshawk dynamos and motors, including dimensions and performance requirements. | 3rd Mar 1921 | Box 35 \ 4 scan 014 | |
| Specifications for dynamos, including winding, armature teeth, and a request for calculations from Mr. Royce. | 16th Mar 1931 | Box 35 \ 4 scan 015 | |
| Correspondence concerning design prints for the Goshawk I & II starter motor and dynamo. | 16th Mar 1931 | Box 35 \ 4 scan 016 | |
| Extract from a meeting discussing the future construction of starter motors and materials like bakelite. | 19th Mar 1921 | Box 35 \ 4 scan 017 | |
| In-house production of starter motors and dynamos for the Goshawk II. | 5th Apr 1921 | Box 35 \ 4 scan 018 | |
| Request to make enquiries with external firms regarding a starter motor for the Goshawk II engine. | 1st Apr 1921 | Box 35 \ 4 scan 019 | |
| Design specifications for the 'Goshawk II' dynamo and starter motor, particularly the bearings and helical gear. | 9th May 1921 | Box 35 \ 4 scan 020 | |
| From EFC arranging a meeting regarding Goshawk II dynamo and starter motor windings. | 18th May 1921 | Box 35 \ 4 scan 021 | |
| Details on the reduction ratio for the Goshawk I and Goshawk II starter. | 24th May 1921 | Box 35 \ 4 scan 022 | |
| Preliminary electrical calculations and specifications for the Goshawk II starter motor. | 2nd Jun 1921 | Box 35 \ 4 scan 023 | |
| Configuration of field windings and brushes for ignition purposes. | 2nd Jun 1921 | Box 35 \ 4 scan 024 | |
| Design of Dynamo and Starter Motors for Goshawk I and II engines. | 7th Jun 1921 | Box 35 \ 4 scan 025 | |
| Drawing No. LeC.1405 for Dynamos & Motors for Goshawk I & II and 40HP Chassis. | 9th Jun 1921 | Box 35 \ 4 scan 026 | |
| Cover note for prints of dynamos and motors for Goshawk I & II and 4CH P. chassis. | 10th Jun 1921 | Box 35 \ 4 scan 027 | |
| Requesting particulars for the Goshawk II dynamo and motor, expressing concerns about potential delays. | 23th Jun 1921 | Box 35 \ 4 scan 028 | |
| Calculations and design considerations for the Goshawk II starter motor. | 14th Jul 1931 | Box 35 \ 4 scan 029 | |
| Calculations and practical construction for the Goshawk II starter motor. | 7th Jul 1921 | Box 35 \ 4 scan 030 | |
| Drawings for the 'Goshawk II' starting motor and field coils. | 1st Jul 1921 | Box 35 \ 4 scan 031 | |
| Specification for a dummy model Armature to test the winding feasibility for the 'Goshawk' II design. | 17th Aug 1921 | Box 35 \ 4 scan 032 | |
| The winding diagram and connections for a 4-pole single series type armature. | 17th Aug 1921 | Box 35 \ 4 scan 033 | |
| Calculations and specifications for the Goshawk II starter motor. | 1st Jul 1921 | Box 35 \ 4 scan 034 | |
| Calculations for motor design parameters, including armature dimensions, flux, and conductor numbers. | 1st Jul 1921 | Box 35 \ 4 scan 035 | |
| Calculations for electrical properties including Back E.M.F., ohmic resistance, and armature values for a motor. | 1st Jul 1921 | Box 35 \ 4 scan 036 | |
| Calculations for the resistance of an armature turn and corresponding wire size. | 1st Jul 1921 | Box 35 \ 4 scan 037 | |
| Calculation table for the ampere turns necessary to produce the required flux. | 1st Jul 1921 | Box 35 \ 4 scan 038 | |
| Calculation sheet for the design and resistance of a field winding. | 19th Jul 1921 | Box 35 \ 4 scan 039 | |
| Drawings for the 'Goshawk II' Starter Motor Brush Spring and Housing modification. | 19th Jul 1921 | Box 35 \ 4 scan 040 | |
| Requesting the Experimental Department make a dummy model armature for the 'Goshawk II' motor and dynamo. | 10th Aug 1921 | Box 35 \ 4 scan 041 | |
| Instruction to produce two dummy model armatures for the 'Goshawk II' Dynamo and S Motor, with a request to allocate experimental numbers. | 17th Aug 1921 | Box 35 \ 4 scan 042 | |
| Winding diagram and specifications for the 'Goshawk' starter motor. | 1st Aug 1921 | Box 35 \ 4 scan 043 | |
| Performance analysis of a C.A.V. Z.C. starter motor on a Goshawk engine. | 26th Aug 1921 | Box 35 \ 4 scan 044 | |
| Specification of brushes for the Goshawk II dynamo and motor. | 30th Aug 1921 | Box 35 \ 4 scan 045 | |
| Performance comparison of the Goshawk II motor as applied to the Goshawk I engine with different reduction ratios. | 30th Aug 1921 | Box 35 \ 4 scan 046 | |
| Calculations for applying a Goshawk II motor to a Goshawk I engine. | 23th Aug 1921 | Box 35 \ 4 scan 047 | |
| Page of calculations for current, volts, engine speed, horsepower, and efficiency. | 31th Aug 1921 | Box 35 \ 4 scan 048 | |
| Obtaining new specimen brushes for the 'Goshawk II' dynamo and motor due to altered holder dimensions. | 31th Aug 1921 | Box 35 \ 4 scan 049 | |
| List of drawings and particulars for the 'GOSHAWK' II S.S. Motor and Dynamo field poles and armature stampings. | 9th Feb 1921 | Box 35 \ 4 scan 050 | |
| Manufacturing method and material for Armature Stampings. | 9th Sep 1921 | Box 35 \ 4 scan 051 | |
| Parts list for the 'Goshawk' II S.S. Motor, covering bearing brackets, brush holders, and cross connectors. | 10th May 1921 | Box 35 \ 4 scan 052 | |
| Modifications, materials, and production methods for various experimental components. | 9th Sep 1921 | Box 35 \ 4 scan 053 | |
| 'Goshawk' II S.S. Motor and Dynamo, requesting an order for commutator brushes for testing. | 9th Sep 1921 | Box 35 \ 4 scan 054 | |
| Requesting an order for two dozen brushes for the Goshawk starter motor. | 10th Sep 1921 | Box 35 \ 4 scan 055 | |
| Parts list and specifications for the 'Goshawk II' starter motor frame and two field winding options. | 1st Sep 1921 | Box 35 \ 4 scan 056 | |
| Experimental specification sheet for field winding, tape, wire, and related electrical components for the Goshawk II unit. | 9th Sep 1921 | Box 35 \ 4 scan 057 | |
| The dispatch of dummy armatures for the 'Goshawk' dynamo and motor. | 23th Sep 1921 | Box 35 \ 4 scan 058 | |
| Instructions to despatch dummy armatures for the Goshawk dynamo and starter motor to Mr. Royce for inspection. | 23th Sep 1921 | Box 35 \ 4 scan 059 | |
| Details and parts list for the 'Goshawk' II Starter Motor Armature. | 1st Sep 1921 | Box 35 \ 4 scan 060 | |
| Component updates and instructions for a starter motor assembly, including Bendix Drive parts. | 9th Feb 1927 | Box 35 \ 4 scan 061 | |
| Induction noise and starter motor issues for the Goshawk 11 engine. | 14th Oct 1921 | Box 35 \ 4 scan 062 | |
| Modifications and requirements for dynamo and motor armature windings. | 10th Oct 1921 | Box 35 \ 4 scan 063 | |
| Note on preventing the failure of machine windings by addressing creep and examining competitor designs. | 10th Oct 1921 | Box 35 \ 4 scan 064 | |
| Note regarding dynamo and motor armature windings for the Goshawk model. | 13th Oct 1921 | Box 35 \ 4 scan 065 | |
| Technical note regarding the starter motor threads, start type, and gearing noise. | 17th Oct 1921 | Box 35 \ 4 scan 066 | |
| Extract detailing drawings for the 'Goshawk II' and 'Swallow' engine designs to be discussed with Mr. Hives. | 5th Nov 1921 | Box 35 \ 4 scan 067 | |
| Extract discussing production delays and material specifications for the Goshawk electrical equipment's commutator. | 9th Nov 1921 | Box 35 \ 4 scan 068 | |
| Experimental memo on modifications to Armature Stampings for the 'Goshawk' S.S. Motor and Dynamo, involving the trial use of Mica Plates. | 9th Dec 1921 | Box 35 \ 4 scan 069 | |
| From Mr. Royce requesting an investigation into the effectiveness of rounded flywheel teeth for the Goshawk starter. | 3rd Jan 1922 | Box 35 \ 4 scan 070 | |
| Use of rounded teeth on Goshawk 11 engine starters, noting this differs from American practice. | 1st Jan 1922 | Box 35 \ 4 scan 071 | |
| First Goshawk II starter motor sent for testing, detailing modifications and production halt. | 14th Jan 1922 | Box 35 \ 4 scan 072 | |
| Clarifying if flywheel teeth edges are rounded in addition to starter pinion teeth. | 6th Jan 1922 | Box 35 \ 4 scan 073 | |
| Instructions for building the Goshawk 11 starter motor, detailing required drawings and parts. | 1st Jan 1922 | Box 35 \ 4 scan 074 | |
| Compiling a complete record of the first motor produced, noting slight differences from previous versions. | 26th Jan 1922 | Box 35 \ 4 scan 075 | |
| Note on the differing dimensions of Morganite brushes ordered for the Goshawk motor. | 26th Jan 1922 | Box 35 \ 4 scan 076 | |
| Instructing the build of the commutator section for the Goshawk 11 starter motor. | 2nd Feb 1922 | Box 35 \ 4 scan 077 | |
| Drawing number LeC.1531 for the Goshawk II starter motor cable connection. | 2nd Feb 1922 | Box 35 \ 4 scan 078 | |
| Experimental request to alter the armature winding for a Goshawk starter motor to reduce electrical resistance. | 2nd Feb 1922 | Box 35 \ 4 scan 079 | |
| Requesting an order for Goshawk starter motor brushes from the Morgan Crucible Company. | 18th Feb 1922 | Box 35 \ 4 scan 080 | |
| Agreeing to reposition a motor terminal on the Goshawk II crankcase by twisting the motor 45 degrees. | 22th Feb 1922 | Box 35 \ 4 scan 081 | |
| Instructions detailing the brush position and advance settings for a Goshawk Motor. | 28th Feb 1922 | Box 35 \ 4 scan 082 | |
| Instruction sheet for modifying the brush gear on Goshawk motor No. 4. | 2nd Mar 1922 | Box 35 \ 4 scan 083 | |
| Instructions for standardising the re-setting of brushes on the Goshawk motor. | 2nd Mar 1922 | Box 35 \ 4 scan 084 | |
| Experimental design change for the 'Goshawk' 11 starter motor, specifically altering the frame and field winding. | 3rd Mar 1922 | Box 35 \ 4 scan 085 | |
| Revision to the Goshawk 11 Starter Motor winding diagram and instructions to alter existing armatures. | 1st Mar 1922 | Box 35 \ 4 scan 086 | |
| Request for the weights of various components of the Goshawk Dynamo and Motor. | 10th Mar 1922 | Box 35 \ 4 scan 087 | |
| List of dynamos, motors, and batteries for various Goshawk chassis models. | 15th Mar 1922 | Box 35 \ 4 scan 088 | |
| Erection and assembly instructions for the Goshawk R.R. starter motor. | 29th Mar 1922 | Box 35 \ 4 scan 089 | |
| Production testing procedures for Goshawk electrical units and motors. | 29th Mar 1922 | Box 35 \ 4 scan 090 | |
| Production test results sheet for Goshawk starter motors, test number 1. | 29th Mar 1922 | Box 35 \ 4 scan 091 | |
| Production brake test results for Goshawk starter motors. | 27th Jan 1922 | Box 35 \ 4 scan 092 | |
| Flux test report for a motor with two sets of readings under different brush settings. | 27th Jan 1922 | Box 35 \ 4 scan 093 | |
| Flux test report for a motor, form 1. | 28th Jan 1922 | Box 35 \ 4 scan 094 | |
| Flux test report for a motor, detailing performance at different speeds and currents. | 28th Jan 1922 | Box 35 \ 4 scan 095 | |
| Torque test results for an R.R. Goshawk motor at 1500 r.p.m. | 1st Feb 1922 | Box 35 \ 4 scan 096 | |
| Brake test results for a starter motor. | 2nd Feb 1922 | Box 35 \ 4 scan 097 | |
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