| Description | Date | Identifier | |
| Status report on the 'Work in Hand' for the R.A.F. Launching Gear Section. | 21th Feb 1941 | Box 175 \ 2 img077 | |
| Proposal to submit an 8-cylinder aluminium block engine to the Air Ministry for an R.A.F. winch project. | 26th Feb 1941 | Box 175 \ 2 img078 | |
| Letter to Wing Commander Buxton confirming the use of a 1/4 inch cable on a winch and requesting the minimum satisfactory drum size. | 26th Feb 1941 | Box 175 \ 2 img079 | |
| Letter to Wing Commander Buxton requesting the minimum drum size for a 1/4 inch cable to be used on a winch. | 26th Feb 1941 | Box 175 \ 2 img080 | |
| Letter from the Royal Air Force discussing the specifications for a launching winch. | 1st Mar 1941 | Box 175 \ 2 img081 | |
| Letter to The Hoffmann Manufacturing Co. urgently requesting a list of ball and roller bearings for an experimental project. | 3rd Mar 1941 | Box 175 \ 2 img082 | |
| Acknowledgement of an enquiry from Hoffmann Manufacturing Co. Ltd. | 5th Mar 1941 | Box 175 \ 2 img083 | |
| Letter to Hydraulic Coupling & Engineering Co. Ltd. discussing installation details for hydraulic couplings. | 6th Mar 1941 | Box 175 \ 2 img084 | |
| Letter from the Ministry of Aircraft Production regarding a change in contact for a glider launching winch. | 6th Mar 1941 | Box 175 \ 2 img085 | |
| Letter to Hydraulic Coupling & Engineering Co. Ltd. regarding a fluid coupling installation and performance specifications. | 6th Mar 1941 | Box 175 \ 2 img086 | |
| Progress report on the development of launching gear, detailing completed work and work in hand. | 7th Mar 1941 | Box 175 \ 2 img087 | |
| Letter regarding the design of a 10-inch launching winch drum, inviting representatives to review drawings. | 8th Mar 1941 | Box 175 \ 2 img088 | |
| Letter from Hoffmann Manufacturing regarding a four-week lead time for bearings. | 10th Mar 1941 | Box 175 \ 2 img089 | |
| Letter from the Royal Air Force regarding a delayed visit concerning drawings for a launching winch. | 12th Mar 1941 | Box 175 \ 2 img090 | |
| Letter to Hoffmann Manufacturing Co. Ltd. requesting to proceed with an order for three sets of bearings. | 14th Mar 1941 | Box 175 \ 2 img091 | |
| Specification document detailing design instructions for a new 6-cylinder aluminium B.60 engine. | 15th Mar 1941 | Box 175 \ 2 img092 | |
| List of 15 requested design features for inclusion in a new specification. | 18th Mar 1941 | Box 175 \ 2 img093 | |
| Urgent request to repurchase a unique high-power Phantom III engine from a private owner for R.A.F. research during the war. | 18th Mar 1941 | Box 175 \ 2 img094 | |
| Necessary modifications for a launching winch following meetings with a Flying Officer. | 24th Mar 1941 | Box 175 \ 2 img095 | |
| List of required design alterations for a winch, including estimated timeframes for completion. | 24th Mar 1941 | Box 175 \ 2 img096 | |
| List of agreed modifications for a launching winch following meetings with Flying Officer Cronfeldt. | 24th Mar 1941 | Box 175 \ 2 img097 | |
| List of required design alterations for a winch, along with time estimates for each task. | 24th Mar 1941 | Box 175 \ 2 img098 | |
| Letter from Hoffmann Manufacturing confirming an order for bearings and outlining pricing terms due to current conditions. | 24th Mar 1941 | Box 175 \ 2 img099 | |
| Minutes of a production meeting regarding material supply, engine production, and personnel. | 24th Mar 1941 | Box 175 \ 2 img100 | |
| Letter detailing agreed modifications for a winch used for launching gliders. | 26th Mar 1941 | Box 175 \ 2 img101 | |
| List of required modifications and redesigns for a winch and cable system, including timelines. | 26th May 1941 | Box 175 \ 2 img102 | |
| Time requirements for various vehicle components and a statement on production quality. | 26th Mar 1941 | Box 175 \ 2 img103 | |
| Letter from the Royal Air Force confirming modifications to the specification for a launching winch. | 28th Mar 1941 | Box 175 \ 2 img104 | |
| List of numbered specifications for a winch, cable, brakes, and vehicle controls. | 28th Feb 1941 | Box 175 \ 2 img105 | |
| Telephone conversation with E. R. Hall about the sale of a Phantom III engine and a Wraith engine. | 28th Feb 1941 | Box 175 \ 2 img106 | |
| Brief typed note stating the location of a Phantom III engine. | 30th Mar 1941 | Box 175 \ 2 img107 | |
| Letter to Group Captain Harvey at R.A.F. Ringway regarding probable delay and a new design completion date. | 30th Mar 1941 | Box 175 \ 2 img108 | |
| Unfavorable impression regarding a profit attempt on Hall's engine. | 30th Sep 1941 | Box 175 \ 2 img109 | |
| Letter from Alvis Ltd forwarding a letter addressed to Group Captain Harvey that was found inside some blueprints. | 31th Mar 1941 | Box 175 \ 2 img110 | |
| Letter of apology to Group Captain Harvey for a delay in delivery due to an internal error. | 31th Mar 1941 | Box 175 \ 2 img111 | |
| Letter from the Royal Air Force regarding modifications to a winch design and an expected trial date. | 8th Apr 1941 | Box 175 \ 2 img112 | |
| Letter from a Royal Air Force Wing Commander to Mr. Robotham concerning the progress of winch drawings. | 20th Apr 1941 | Box 175 \ 2 img113 | |
| Letter to Wing Commander Buxton regarding a delay in the design of a winch due to specification changes. | 28th Apr 1941 | Box 175 \ 2 img114 | |
| Requesting prints of a Launching Winch project for record-keeping purposes as work is being held up. | 29th Apr 1941 | Box 175 \ 2 img115 | |
| Requesting prints of 'Launching Winch' designs be made for archival purposes due to the project being put on hold. | 29th Apr 1941 | Box 175 \ 2 img116 | |
| Letter to Squadron-Leader Brie postponing a visit until design work for a winch is completed. | 14th May 1941 | Box 175 \ 2 img117 | |
| Payment for two invoices for various bearings from the Hoffmann Manufacturing Co. Ltd. | 20th May 1941 | Box 175 \ 2 img118 | |
| Asking for and specifying a recommended material for production. | 26th May 1941 | Box 175 \ 2 img119 | |
| Letter from the Ministry of Aircraft Production confirming a request for the design of a glider launching winch. | 26th May 1941 | Box 175 \ 2 img120 | |
| Calculation for the weight per length of a 45 cwt. winch cable. | 30th May 1941 | Box 175 \ 2 img121 | |
| Letter to the Ministry of Aircraft Production regarding a winch design, project hours, and timeline. | 5th Jun 1941 | Box 175 \ 2 img122 | |
| Specification document for a launching gear, detailing the power unit, clutch, gears, and cable systems. | 5th Jun 1941 | Box 175 \ 2 img123 | |
| List of technical specifications for vehicle components including the throttle, clutch, fuel tank, and operator's cabin. | 5th Jun 1941 | Box 175 \ 2 img124 | |
| Winch drum diameters and suggested gear ratios, including performance calculations. | 5th Jun 1941 | Box 175 \ 2 img125 | |
| Explanation for why pull and speed curves are depicted as narrow bands. | 5th Jun 1941 | Box 175 \ 2 img126 | |
| Blueprint graph detailing launching performance for a 10-inch drum, showing cable speed versus distance for various gear ratios. | 5th Jun 1941 | Box 175 \ 2 img127 | |
| Graph plotting winch pull in cable (lbs) against different gear ratios. | 5th Jun 1941 | Box 175 \ 2 img128 | |
| Graph plotting speed and cable pull against distance for a launching system with a 12-inch drum. | 31th May 1941 | Box 175 \ 2 img129 | |
| Performance graph showing cable pull against distance for a winch with different gear ratios. | 31th May 1941 | Box 175 \ 2 img130 | |
| The cable drum diameters and gear ratios for a launching winch. | 21th May 1941 | Box 175 \ 2 img131 | |
| Page detailing the assumptions and calculations for cable speed and pull graphs, based on engine performance. | 31th May 1940 | Box 175 \ 2 img132 | |
| Specification document for launching gear. | 31th May 1940 | Box 175 \ 2 img133 | |
| Specification sheet detailing various vehicle components and systems. | 31th May 1940 | Box 175 \ 2 img134 | |
| Technical document detailing various winch drum diameters and gear ratios. | 31th May 1940 | Box 175 \ 2 img135 | |
| Note explaining why pull and speed curves are shown in narrow bands representing layers of cable. | 31th May 1940 | Box 175 \ 2 img136 | |
| Graph plotting cable pull against distance for various gear ratios and speed. | 1st Jan 1941 | Box 175 \ 2 img137 | |
| Graph plotting cable pull in pounds against run distance in feet for a gear ratio test. | 1st Jan 1941 | Box 175 \ 2 img138 | |
| Graph plotting cable speed and pull against distance for a 12' drum system at different ratios. | 31th May 1944 | Box 175 \ 2 img139 | |
| Graph plotting cable pull in pounds against distance in feet for various gear ratios. | 31th May 1944 | Box 175 \ 2 img140 | |
| Reviewing the man-hours and timeline required to complete the Launching Winch. | 5th Jun 1941 | Box 175 \ 2 img141 | |
| Launching winch scheme, providing blueprints and listing additional jobs required. | 5th Jun 1941 | Box 175 \ 2 img142 | |
| The design drawings for a launching winch and gear. | 18th Jun 1941 | Box 175 \ 2 img143 | |
| The flanges connecting driving and driven units to a fluid coupling for a launching winch. | 10th Jul 1941 | Box 175 \ 2 img144 | |
| Secret memo describing the screw gear for a drum winding carriage on a launching winch. | 10th Jul 1941 | Box 175 \ 2 img145 | |
| Design of a reduction gear for a winch, including gear ratios and materials. | 22th Jul 1941 | Box 175 \ 2 img146 | |
| New scheme for a cable drum for the Launching Gear. | 30th Jul 1941 | Box 175 \ 2 img147 | |
| Technical memorandum on the stresses and loading of a winch reduction gear. | 31th Jul 1941 | Box 175 \ 2 img148 | |
| Review of the winch programme for the launching gear, detailing completed schemes, work in hand, and outstanding designs. | 8th Aug 1941 | Box 175 \ 2 img149 | |
| Covering letter to Mr. Shackleton of the Ministry of Aircraft Production regarding a winch. | 22th Aug 1941 | Box 175 \ 2 img150 | |
| Letter concerning a controversy over quantities supplied by The Hoffmann Mfg. Co. Ltd. and the return of surplus items. | 22th Aug 1941 | Box 175 \ 2 img151 | |
| Letter from The Hoffmann Mfg. Co. Ltd. regarding a discrepancy in a bearing order. | 19th Aug 1941 | Box 175 \ 2 img152 | |
| Invoices for bearings from Hoffmann Manufacturing Co. and a request for a covering order due to quantity discrepancies. | 1st Aug 1941 | Box 175 \ 2 img153 | |
| The hand throttle control for the launching gear winch. | 5th Sep 1941 | Box 175 \ 2 img154 | |
| Operation of the launching gear clutch and necessary modifications to the mechanism. | 5th Sep 1941 | Box 175 \ 2 img155 | |
| Follow-up letter to Squadron Leader Brie regarding a previous correspondence, with an attached copy. | 14th Sep 1941 | Box 175 \ 2 img156 | |
| Letter to the Royal Air Force explaining delays in the design of a launching winch and suggesting a visit. | 22th Aug 1941 | Box 175 \ 2 img157 | |
| Guard for a launching gear cable drum. | 9th Sep 1941 | Box 175 \ 2 img158 | |
| Listing original drawings for launching gear components and a radiator plaque, issued for record purposes. | 24th Sep 1942 | Box 175 \ 2 img159 | |
| Secret memo detailing modifications for a 40 m.m. type BD Gun non-elevating mounting. | 24th Aug 1940 | Box 175 \ 3 img001 | |
| Blueprints and modifications for a 40 mm Naval Gun Type BD ejector trip. | 24th Aug 1940 | Box 175 \ 3 img002 | |
| Proposing to treat the 40mm Naval Gun and its Mounting as two separate units for future projects. | 26th Aug 1940 | Box 175 \ 3 img003 | |
| Letter to The British Power Boat Co. Ltd. concerning the specifications for 40 mm, type BD gun mountings. | 7th Aug 1940 | Box 175 \ 3 img004 | |
| Letter concerning the estimated weight of power-driven gun mountings and allocation to craft. | 27th Aug 1940 | Box 175 \ 3 img005 | |
| Appendix listing the approximate weights of various gun mountings and ammunition components. | 27th Aug 1940 | Box 175 \ 3 img006 | |
| Extract from a memo regarding the production of a List of Parts (L.O.P.) for a non-elevating gun mounting. | 28th Aug 1940 | Box 175 \ 3 img007 | |
| Letter from the Admiralty regarding revised drawings for a 40mm mounting and proposing a meeting. | 28th Aug 1940 | Box 175 \ 3 img008 | |
| Query regarding difficulties with ammunition and a request for supplies of half-inch American ammunition for testing. | 28th Aug 1940 | Box 175 \ 3 img009 | |
| Specifications for an ammunition tray for a 40mm gun on a pedestal mounting. | 31th Aug 1940 | Box 175 \ 3 img010 | |
| The status of various gun section projects, split into work in progress and completed work. | 2nd Sep 1940 | Box 175 \ 3 img011 | |
| Development and procurement of a body strap for a Type B.D. Gun with supplier Hampton & Sons Ltd. | 2nd Sep 1940 | Box 175 \ 3 img012 | |
| Secret memo discussing the mounting, ammunition, and armour specifications for a 40mm B.D. gun on an M.T. Boat. | 2nd Sep 1940 | Box 175 \ 3 img013 | |
| Relationships with customers and contractors, including the Admiralty and British Power Boat Co., concerning a gun project. | 27th Aug 1940 | Box 175 \ 3 img014 | |
| Letter from H.M.S. EXCELLENT to Mr. Robotham regarding drawings and a description of a gun. | 2nd Sep 1940 | Box 175 \ 3 img015 | |
| Letter to Captain Slayter regarding the manufacturing progress and development of a 40mm gun. | 4th Sep 1940 | Box 175 \ 3 img016 | |
| Letter to the Admiralty concerning a visit to Derby to discuss the mountings for the 40mm gun. | 4th Sep 1940 | Box 175 \ 3 img017 | |
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