| Description | Date | Identifier | |
| Engine vibration tests with and without counterweights and a flywheel. | 1st Nov 1929 | Box 14 \ 2 Scan055 | |
| Road and motoring tests to determine and reduce engine vibration by testing different crankshaft and flywheel configurations. | 11th Nov 1922 | Box 14 \ 2 Scan056 | |
| Vehicle noise, vibration, and harshness testing before and after modifying the flywheel and clutch. | 1st Nov 1929 | Box 14 \ 2 Scan057 | |
| 3rd gear and flywheel vibration analysis. | 1st Nov 1929 | Box 14 \ 2 Scan058 | |
| Tests concerning crankshaft and slipper drive vibration, with results from S.S. and Chrysler models. | 1st Nov 1929 | Box 14 \ 2 Scan059 | |
| Comparison of standard Phantom type slipper drives and low inertia spring drives, focusing on overhang, vibration, and engine feet placement. | 1st Nov 1922 | Box 14 \ 2 Scan060 | |
| The use and effectiveness of balance weights on an engine crankshaft. | 1st Nov 1923 | Box 14 \ 2 Scan061 | |
| Technical discussion on crankshaft vibration, torsional periods, and balance. | 1st Nov 1929 | Box 14 \ 2 Scan062 | |
| Crankcase and crankshaft vibration and distortion during testing, with a comparison to a Chrysler engine. | 8th Nov 1929 | Box 14 \ 2 Scan063 | |
| Crankshaft and crankcase vibration, comparing materials and summarising flywheel test results. | 29th Nov 1929 | Box 14 \ 2 Scan064 | |
| Flywheel vibrations, their causes, and comparisons to similar phenomena. | 1st Nov 1939 | Box 14 \ 2 Scan065 | |
| Hypothesis on flywheel vibration frequency and crankshaft smoothness, with proposed experiments. | 1st Nov 1939 | Box 14 \ 2 Scan066 | |
| Key engine design features for longevity and smoothness, and the factors causing increased engine speeds. | 1st Nov 1929 | Box 14 \ 2 Scan067 | |
| Methods to improve engine longevity and smoothness, comparing a heavier crankshaft to a stiffer crankcase. | 26th Nov 1929 | Box 14 \ 2 Scan068 | |
| Crankshaft design, recommending experiments with heavier counter-balanced shafts and stiffer crankcases. | 8th Nov 1929 | Box 14 \ 2 Scan069 | |
| Page discussing tests to try and measure distortions in webs. | 1st Nov 1929 | Box 14 \ 2 Scan070 | |
| Design blueprint for a balance-weight crankshaft with multiple section views and design features. | 22th Nov 1928 | Box 14 \ 2 Scan071 | |
| Blueprint detailing a mechanical lever assembly with a parts list. | 22th Aug 1929 | Box 14 \ 2 Scan072 | |
| Test results for a crankshaft under various modifications. | 11th Nov 1929 | Box 14 \ 2 Scan073 | |
| Technical memorandum comparing the standard Phantom II crankshaft with a stiffer version (E.79351) with large pins. | 14th Nov 1929 | Box 14 \ 2 Scan074 | |
| The design, operation, and timing effects of a low inertia crankshaft damper for the Phantom 11, K.2B series and onwards. | 3rd Jan 1930 | Box 14 \ 2 Scan075 | |
| Instructions for timing, dismantling, load measurement, and testing of a slipper wheel assembly. | 3rd Jan 1930 | Box 14 \ 2 Scan076 | |
| Diagrammatic representation of a K.2.B. Series Phantom II Low Inertia Damper. | 8th Jan 1930 | Box 14 \ 2 Scan077 | |
| Backing sheet with a 'RECEIVED' stamp from the Derby works. | 8th Jan 1930 | Box 14 \ 2 Scan078 | |
| Blueprint showing a cross-section and front view of a flywheel damper with a corrugated plate. | 3rd Jan 1930 | Box 14 \ 2 Scan079 | |
| Blank page with a purple 'Print Room' date stamp from Derby. | 3rd Jan 1930 | Box 14 \ 2 Scan080 | |
| Technical memorandum discussing troubleshooting an oil leak at the rear end of a P.2. crankshaft. | 12th Jul 1930 | Box 14 \ 2 Scan081 | |
| Testing of Nitro Hardened Steel crankshafts and recommending a production order. | 19th Sep 1930 | Box 14 \ 2 Scan082 | |
| Expressing caution about standardizing Nitro Hardened Steel for crankshafts due to insufficient testing mileage. | 29th Sep 1930 | Box 14 \ 2 Scan083 | |
| Production testing of Nitro Hardened Steel for Phantom crankshafts. | 2nd Oct 1930 | Box 14 \ 2 Scan084 | |
| Reduction in the production order quantity for chassis using Nitro Hardened Steel. | 13th Oct 1930 | Box 14 \ 2 Scan085 | |
| Proposing to reduce an order quantity of Nitro Hardened Steel to 12 for economic reasons. | 15th Oct 1930 | Box 14 \ 2 Scan086 | |
| Instruction to order 12 forgings of a standard type Phantom II crankshaft in nitralloy steel. | 16th Oct 1930 | Box 14 \ 2 Scan087 | |
| Experimental increase in crankpin diameter for the 40/50 HP crankshaft and the potential to revert the dies. | 31th Oct 1930 | Box 14 \ 2 Scan088 | |
| From 'R.' proposing a trial for an 'interlaced 6 throw crankshaft' design on a P.V. 12 cylinder aero engine. | 1st Dec 1930 | Box 14 \ 2 Scan089 | |
| Crankshaft balancing, crankchamber stiffness and vibration reduction for 25HP and 45HP engines. | 20th Dec 1930 | Box 14 \ 2 Scan090 | |
| Urgent improvements for the 25HP and 45HP models, focusing on crankshafts, balance, and suspension. | 23th Dec 1930 | Box 14 \ 2 Scan091 | |
| Design considerations for a 25HP and 45HP balanced crankshaft. | 23th Dec 1930 | Box 14 \ 2 Scan092 | |
| Engine crankshaft balancing, counterweights, and flywheel modifications for smoother operation. | 9th Jan 1931 | Box 14 \ 2 Scan093 | |
| Test results for the 20-EX model, detailing Torsional Period, RPM, MPH, and speedometer checks. | 9th Jan 1931 | Box 14 \ 2 Scan094 | |
| Test results for crank pins, torsional period, and top gear speed for model 19-EX. | 15th Jan 1931 | Box 14 \ 2 Scan095 | |
| Proposal to increase the thickness of the crankshaft flange and flywheel web to improve stiffness. | 2nd Mar 1931 | Box 14 \ 2 Scan096 | |
| Scheme for four balance weights for the Phantom engine, comparing two-stud and single-stud designs. | 16th Feb 1931 | Box 14 \ 2 Scan097 | |
| Covering note regarding the original document LeC. 2874 for P. 2. Balance Weights. | 16th Feb 1931 | Box 14 \ 2 Scan098 | |
| Modifications to the flywheel and crankshaft flange to reduce weight and improve bolting. | 27th Mar 1931 | Box 14 \ 2 Scan099 | |
| The detailing of a four balance weight crankshaft and ordering a new forging in Nitro Alloy. | 6th Mar 1931 | Box 14 \ 2 Scan100 | |
| Instruction to test a flywheel with 9 bolts instead of 6, using the same bolt diameter. | 10th Mar 1931 | Box 14 \ 2 Scan101 | |
| Technical memorandum with sketches discussing various designs for attaching balance weights to a crankshaft. | 11th Mar 1931 | Box 14 \ 2 Scan102 | |
| And comparing different crankshaft balance weight schemes based on a telegram confirmation. | 13th Mar 1931 | Box 14 \ 2 Scan103 | |
| Different engine balancing weight schemes and their implications. | 20th Mar 1931 | Box 14 \ 2 Scan104 | |
| New crankshaft with four balance weights and a stiffer rear flange for the Phantom II Chassis. | 20th Mar 1931 | Box 14 \ 2 Scan105 | |
| Highlighting assembly difficulties with the crankshaft, flywheel, and balance weights due to small clearances. | 20th Mar 1931 | Box 14 \ 2 Scan106 | |
| The decision against a special Nitro Alloy crankshaft for the Phantom II chassis. | 23th Mar 1931 | Box 14 \ 2 Scan107 | |
| Use and effects of crankshaft balance weights on both aero and car engines. | 2nd Apr 1931 | Box 14 \ 2 Scan108 | |
| Analysis of crankshaft balancing schemes, including 4-weight and 8-weight options for a 6-cylinder engine. | 2nd Apr 1931 | Box 14 \ 2 Scan109 | |
| Comparing various crankshaft balancing schemes for different engine applications. | 21th Nov 1932 | Box 14 \ 2 Scan110 | |
| Comparison table of bearing loads for different crankshaft balancing schemes. | 21th Nov 1932 | Box 14 \ 2 Scan111 | |
| Blank page with a purple ink stamp from the print room in the bottom right corner. | 23th Apr 1931 | Box 14 \ 2 Scan112 | |
| Comparison of five alternative balance weight schemes for a crankshaft. | 2nd Apr 1931 | Box 14 \ 2 Scan113 | |
| Page with a purple stamp from the print room. | 23th Apr 1931 | Box 14 \ 2 Scan114 | |
| Merits of different engine balance weight schemes. | 12th Apr 1931 | Box 14 \ 2 Scan115 | |
| Technical memorandum investigating the cause of chassis vibrations at specific speeds and their relationship to torque reactions. | 21th Apr 1931 | Box 14 \ 2 Scan116 | |
| Potential chassis modifications to alter its periodicity. | 21th Apr 1931 | Box 14 \ 2 Scan117 | |
| Engine smoothness and the effects of various balance weight schemes on the flywheel and crankshaft. | 8th May 1931 | Box 14 \ 2 Scan118 | |
| Design, benefits, and experimental requirements for engine balance weights. | 19th May 1931 | Box 14 \ 2 Scan119 | |
| Different balance weight schemes for flywheels and crankshafts, referencing experiments and 25 HP production designs. | 9th May 1931 | Box 14 \ 2 Scan120 | |
| Technical note detailing calculations for balance weights and their effect on shaft critical speed. | 20th May 1931 | Box 14 \ 2 Scan121 | |
| Technical report on the effect of balance weights on flywheel wobble for Phantom II and 25 HP models. | 23th May 1931 | Box 14 \ 2 Scan122 | |
| Flywheel and crankshaft balance weight testing to improve smoothness and reduce wear. | 23th May 1931 | Box 14 \ 2 Scan123 | |
| Summary of useful data for Phantom II and 25HP engines, detailing weights and performance characteristics of crankshafts and other components. | 1st May 1931 | Box 14 \ 2 Scan124 | |
| 'Eight Weight Scheme' for crankshaft balance weights required for a 10,000 miles test. | 18th Jun 1931 | Box 14 \ 2 Scan125 | |
| Experiment for a crankshaft with larger diameter journals and a revised balance weight scheme. | 7th Mar 1931 | Box 14 \ 2 Scan126 | |
| Calculations for 40/50 balance weights on a stiffened Phantom crankshaft. | 2nd Aug 1931 | Box 14 \ 2 Scan127 | |
| Drawing and calculations for a balance weight. | 11th Aug 1931 | Box 14 \ 2 Scan128 | |
| The failure of friction plates on the 40/50 HP chassis low inertia damper and proposed remedies. | 11th Aug 1931 | Box 14 \ 2 Scan129 | |
| Testing balanced crankshafts to resolve flywheel wobble and the resulting production and design implications for various models. | 21th Aug 1931 | Box 14 \ 2 Scan130 | |
| Intentions and challenges of balancing crankshafts. | 17th Aug 1931 | Box 14 \ 2 Scan131 | |
| Future car crankshafts, including for the 25 HP model, be produced in hardened material. | 21th Aug 1931 | Box 14 \ 2 Scan132 | |
| Proposal for a partly balanced and stiffened crankshaft for the Phantom II engine. | 17th Sep 1931 | Box 14 \ 2 Scan133 | |
| Conclusions on engine balance weights, flywheel vibrations, and crankchamber deflections. | 28th Sep 1931 | Box 14 \ 2 Scan134 | |
| Design parameters for a Phantom II balanced crankshaft using an 8-weight scheme. | 29th Sep 1931 | Box 14 \ 2 Scan135 | |
| Fixed dimensions for the Phantom II Balanced Crankshaft. | 30th Sep 1931 | Box 14 \ 2 Scan136 | |
| Summary of a telephone conversation regarding Phantom II balance weights, 20/25 HP exhaust pipe failures, and Phantom II frame fittings. | 22th Oct 1931 | Box 14 \ 2 Scan137 | |
| Balancing of the Phantom II crankshaft from its present forging. | 27th Oct 1931 | Box 14 \ 2 Scan138 | |
| Balancing of a crankshaft and the scheme for balance weights. | 20th Oct 1931 | Box 14 \ 2 Scan139 | |
| Confirmation of instructions to proceed with scheme 1549 for Phantom II crankshaft balance weights. | 2nd Nov 1931 | Box 14 \ 2 Scan140 | |
| Requesting the packing of main bearings and a broken cap from 25-EX for inspection by 'R'. | 3rd Nov 1931 | Box 14 \ 2 Scan141 | |
| Requesting the removal of sludge from specific crankpins for a test on oil lubrication. | 4th Nov 1931 | Box 14 \ 2 Scan142 | |
| Recommending the use of Nitro Alloy for all future experimental crankshafts. | 7th Dec 1931 | Box 14 \ 2 Scan143 | |
| Decision on using a balance weight system for Phantom II (N.2 Series) crankshafts. | 29th Dec 1931 | Box 14 \ 2 Scan144 | |
| Request for the weights of various crankshafts in different conditions. | 11th Jan 1932 | Box 14 \ 2 Scan145 | |
| Modifications to low inertia crankshaft dampers for the 20/25 and Phantom II models. | 21th Apr 1932 | Box 14 \ 2 Scan146 | |
| Inquiring about the availability of a second large journal crankshaft for testing on a 20-EX S.S.3 unit. | 2nd May 1932 | Box 14 \ 2 Scan147 | |
| Standardisation of the Nitro Hardened Crankshaft. | 17th Aug 1932 | Box 14 \ 2 Scan148 | |
| Standardisation form for a new chassis part. | 26th Nov 1932 | Box 14 \ 2 Scan149 | |
| Standardisation document for a balanced crank to SCH.1549, detailing test reports, cost differences, and approvals. | 9th Jun 1932 | Box 14 \ 2 Scan150 | |
| Costs and logistics of fitting a new part to an 'O' Series chassis. | 26th Nov 1932 | Box 14 \ 2 Scan151 | |
| Crankshaft lubrication and solutions to bearing failures on the Phantom 10,000 miles car. | 24th Jun 1933 | Box 14 \ 2 Scan152 | |
| Proposed modification to crankshaft lubrication by increasing the number of journal holes. | 9th Feb 1933 | Box 14 \ 2 Scan153 | |
| Instructions for a Phantom II crankshaft experiment, replacing part E.83796 with E.83811. | 7th Mar 1933 | Box 14 \ 2 Scan154 | |
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