Rolls-Royce Archives
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
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Proposal to test a 6/1 compression ratio on the 20 HP engine to compare its specific output with that of the Lorraine.31th Mar 1927Box 22 \ 4  Scan119
Performance graph showing the Brake Horse Power and Brake Mean Effective Pressure increase on a 20 HP engine due to fitting larger valves.31th Mar 1927Box 22 \ 4  Scan120
Blank page with a date stamp from the Derby office.1st Apr 1927Box 22 \ 4  Scan121
Performance graph comparing an engine's BHP and BMEP using standard versus larger valves and different carburettors.31th Mar 1927Box 22 \ 4  Scan122
Graph showing a 20HP power increase due to higher compression ratio, larger valves, and lower depression in the induction pipe.31th Mar 1927Box 22 \ 4  Scan123
Graph of gas velocity past standard and large valves relative to engine RPM for a 20 HP engine.31th Mar 1927Box 22 \ 4  Scan124
Blueprint detailing the arrangement of two Zenith carburetters on the 20HP model.1st Apr 1927Box 22 \ 4  Scan125
The reverse of a document or print, marked with a date and location stamp.1st Apr 1927Box 22 \ 4  Scan126
Experiments on crankshaft torsional vibrations and vibration dampers for the 20 HP engine.22th Apr 1927Box 22 \ 4  Scan127
The application and effectiveness of friction dampers and harmonic balancers on engines.22th Apr 1927Box 22 \ 4  Scan128
Technical discussion on crankshaft vibration, dampers, and harmonic periods in relation to a specific engine model, 1-G-1.22th Apr 1927Box 22 \ 4  Scan129
Analysis of engine vibration, focusing on the factors of stiffness and inertia within the crankshaft assembly.22th Apr 1927Box 22 \ 4  Scan130
Page from an engine dynamics report comparing inertia and stiffness figures for two models, a standard 20 HP and a 1-G-1.22th Apr 1927Box 22 \ 4  Scan131
Page discussing crankshaft stiffness, inertia, and the free period of vibration.22th Apr 1927Box 22 \ 4  Scan132
Comparison of crankshaft inertia and stiffness between the standard 20 HP engine and the Lorraine Dietrich engine.22th Apr 1927Box 22 \ 4  Scan133
Analysis comparing the inertia and stiffness of four-bearing versus seven-bearing crankshafts, with reference to the Lorraine and Phantom engines.22th Apr 1927Box 22 \ 4  Scan134
Crankshaft stiffness, inertia, and vibration factors, concluding with a summary of damper types.22th Apr 1927Box 22 \ 4  Scan135
Page discussing engine design considerations for dampers, crankshaft stiffness, inertia, and timing gear drive.22th Apr 1927Box 22 \ 4  Scan136
Analysis of engine vibrations and dampers for the 20 HP engine, including considerations for increasing the master period.22th Apr 1927Box 22 \ 4  Scan137
Analysis of harmonic vibrations and their effect on the crankshaft in a six-cylinder inline engine.22th Apr 1927Box 22 \ 4  Scan138
Continuation page of a technical analysis on shaft frequency, harmonic vibrations, and engine speeds.22th Apr 1927Box 22 \ 4  Scan139
Calculation sheet for the periodicity and synchronous speed of a Lorraine-Dietrich crankshaft.25th Apr 1927Box 22 \ 4  Scan140
Blank document page with a 'Royce, Limited, Print Room, Derby' stamp.25th Apr 1927Box 22 \ 4  Scan141
Diagram showing the amplitude of torsional oscillation due to gas pressure harmonics at full throttle for a Standard 20 engine without a damper.10th Apr 1927Box 22 \ 4  Scan142
Mostly blank document page with a purple company stamp in the bottom right corner.25th Apr 1987Box 22 \ 4  Scan143
Graph plotting power increase and induction pipe depression against engine RPM for a 20HP engine.30th Mar 1927Box 22 \ 4  Scan144
The reverse side of a document page with a purple ink stamp in the bottom right corner.1st Apr 1927Box 22 \ 4  Scan145
Suggesting a modified valve timing for the Sports Phantom to improve high-speed output.23th Apr 1927Box 22 \ 4  Scan146
Request for a 20 HP car for use and reference, preferably a Lorraine model with a crankshaft damper.5th Mar 1927Box 22 \ 4  Scan147
The return of a Lorraine Dietrich car to France for sale, due to it having left-hand steering.6th May 1927Box 22 \ 4  Scan148
Internal memorandum about returning a left-hand steering Lorraine Dietrich car to Paris for sale, and the status of three other car bodies designated for scrap.30th Nov 1927Box 22 \ 4  Scan149
Expressing interest in the 12-cylinder Maybach car and its potential similarities to a proposed aeroplane engine.20th Mar 1930Box 22 \ 5  Scan001
Obtaining full particulars for a 12 Cylinder 'Maybach' Car.21th Mar 1930Box 22 \ 5  Scan002
Internal memorandum discussing a 12-Cylinder Maybach car, a letter from a representative in Berlin, and the potential purchase of a chassis.28th Mar 1930Box 22 \ 5  Scan003
Letter discussing the 12-Cylinder Maybach car, including an engine report.26th Mar 1930Box 22 \ 5  Scan004
Copy of a letter from Hans Detlof von Winterfeldt detailing engine design, accessibility, and fuel consumption issues.30th Aug 1930Box 22 \ 5  Scan005
Inquiry to Messrs. Barkers & Co. Ltd. about purchasing a Maybach Double Six with an automatic gearbox.30th Aug 1930Box 22 \ 5  Scan006
Letter from coachbuilder Barker & Co. regarding an enquiry for a Maybach Double Six car for a client.1st Sep 1930Box 22 \ 5  Scan007
Letter from coachbuilders Barker & Co. regarding an enquiry to the Maybach Company and forwarding their catalogue.17th Sep 1930Box 22 \ 5  Scan008
Potential purchase of a Maybach 12-cylinder car for analysis of its gearbox.10th Oct 1930Box 22 \ 5  Scan009
Potential purchase of a Maybach 12-cylinder car.3rd Oct 1930Box 22 \ 5  Scan010
Trial run and potential cost of importing a Maybach car.10th Oct 1930Box 22 \ 5  Scan011
From Sg. to Hs. discussing the potential acquisition of a Maybach car before a trip to America.17th Oct 1930Box 22 \ 5  Scan012
Letter from coachbuilders Barker & Co. arranging a meeting with Dr. Maybach about a new car.1st Nov 1930Box 22 \ 5  Scan013
The proposal to purchase a Maybach car as a sample for a future twelve-cylinder engine project.3rd Nov 1930Box 22 \ 5  Scan014
Letter from Barker & Co. to Mr. Rowbotham about a visit from Maybach representatives and Bentley's interest in their gearbox.8th Nov 1933Box 22 \ 5  Scan015
From 'R' outlining current engine work priorities, including aero engines, the P.V. engine, and the 25HP, and a decision on the Maybach car.10th Nov 1930Box 22 \ 5  Scan016
Cover letter accompanying the latest information on the 'Maybach'.13th Nov 1930Box 22 \ 5  Scan017
Letter to Mr. A. Arnold of Messrs. Barker & Co. Ltd regarding an opportunity to try a Maybach.13th Nov 1930Box 22 \ 5  Scan018
Inquiry about the progress of experiments with Maybach type clutches in conjunction with a helical 3rd speed.14th Nov 1930Box 22 \ 5  Scan019
From 'Sg.' to 'Hs.' regarding a Maybach Cap, enclosing a copy of a letter to Herr von Winterfeldt.6th Feb 1931Box 22 \ 5  Scan020
Confidential letter enquiring about the potential purchase of a 12-cylinder Maybach limousine.8th Feb 1931Box 22 \ 5  Scan021
Telephone message regarding prices and options for a Maybach car.9th Feb 1931Box 22 \ 5  Scan022
From 'Sg.' to 'Hs.' concerning a Maybach Car and a letter sent to Herr von Winterfeldt.16th Feb 1931Box 22 \ 5  Scan023
Confidential letter to Herr von Winterfeldt concerning a Maybach car.13th Feb 1931Box 22 \ 5  Scan024
Recommending a trip to Berlin to test a Maybach car and discuss clutch and gearbox designs with the Maybach company.18th Feb 1931Box 22 \ 5  Scan025
From Sg. to Hs. regarding a Maybach Car, correcting a date and referencing a letter sent to Herr von Winterfeldt.19th Feb 1931Box 22 \ 5  Scan026
Confidential letter arranging a visit to Berlin to test Maybach cars.19th Feb 1931Box 22 \ 5  Scan027
Technical memorandum discussing the difficulties and remedies for the engagement of Maybach dogs in a transmission system.20th Feb 1931Box 22 \ 5  Scan028
Transmission flexibility, clutch engagement, and gear change mechanisms.23th Feb 1931Box 22 \ 5  Scan029
Evaluating Maybach cars at the Berlin Motor Show and the problematic testing of Maybach clutches on car 14-EX.23th Feb 1931Box 22 \ 5  Scan030
Circulating a telegram suggesting the trial of company bodies on a Maybach chassis.28th Feb 1931Box 22 \ 5  Scan031
Discussion with Dr. Maybach regarding the technical specifications and issues of Maybach dog clutches.2nd Mar 1931Box 22 \ 5  Scan032
Analysis and description of the Maybach four-speed easy-change gearbox, including operational diagrams.2nd Mar 1931Box 22 \ 5  Scan033
Cross-section diagram and gear ratio table for a new Maybach transmission for large vehicles.2nd Mar 1931Box 22 \ 5  Scan034
Trial report of two Maybach cars in Berlin, detailing the performance of the 4-speed silent gearbox.2nd Mar 1931Box 22 \ 5  Scan035
Vehicle performance review covering the gearbox, engine, steering, and brakes, with comparisons to other vehicles.2nd Mar 1931Box 22 \ 5  Scan036
Summary memo discussing the merits and potential purchase of a Maybach gearbox for testing.2nd Mar 1931Box 22 \ 5  Scan037
Design of Maybach gearbox dogs, specifically face angles, tooth rounding, and engagement.2nd Mar 1931Box 22 \ 5  Scan038
Trial of a Maybach car's gearbox and considerations for developing a similar easy-change, silent gearbox.4th Mar 1931Box 22 \ 5  Scan039
Merits of developing a 12-cylinder engine in-house versus purchasing an existing car.4th Mar 1931Box 22 \ 5  Scan040
Letter from Maybach's agent arranging a demonstration of the Maybach Gearbox.27th Apr 1931Box 22 \ 5  Scan041
Letter to Ernst Schneider apologising for a mislaid letter and arranging a car trial with the chief engineer.6th May 1931Box 22 \ 5  Scan042
Arranging a trial for a Maybach car with Mr Ernst Schneider.1st Feb 1935Box 22 \ 5  Scan043
Mercedes oiling scheme and a potential patent conflict.9th Jun 1910Box 22 \ 5  Scan044
With specifications for a new type of Mercedes.15th Oct 1909Box 22 \ 5  Scan045
Letter discussing the potential purchase of a new Mercedes chassis and evaluating different engine designs.13th Jun 1910Box 22 \ 5  Scan046
Letter to F.H. Royce discussing the purchase of a Mercedes for a client, detailing two models.16th Jun 1910Box 22 \ 5  Scan047
Engine and clutch designs of various Mercedes models.22th Jun 1910Box 22 \ 5  Scan048
Technical memo comparing a 35/40 engine's features, including its clutch and ignition system.22th Jun 1910Box 22 \ 5  Scan049
Letter discussing the evaluation of competitor cars with a patented double bevel back axle drive.22th Jun 1910Box 22 \ 5  Scan050
Brief internal memo from F.H.R. to C.J. expressing skepticism about a business arrangement.22th Jun 1910Box 22 \ 5  Scan051
Potential purchase of Mercedes cars for evaluation and considering a Renault in exchange.27th Jun 1910Box 22 \ 5  Scan052
The running condition and design flaws of a recently arrived Mercedes car.6th Jul 1910Box 22 \ 5  Scan053
Issues with the scuttle dash causing heat and poor steering.6th Jul 1910Box 22 \ 5  Scan054
Request for a description of the Mercedes lubrication system.6th Oct 1910Box 22 \ 5  Scan055
Dynamometer test report for a Mercédès chassis.22th Nov 1911Box 22 \ 5  Scan056
Specification and drawing for a 26-tooth steel crankshaft pinion for a 30 HP Mercedes.21th Dec 1910Box 22 \ 5  Scan057
Pencil rubbing of a 'Mercedes small worm wheel'.21th Dec 1910Box 22 \ 5  Scan058
And sketch of a Mercedes large crown wheel's teeth.21th Aug 1914Box 22 \ 5  Scan059
And a sketch regarding a large power Mercedes component.21th Aug 1914Box 22 \ 5  Scan060
Instructions and specifications for a Mercedes Engine.29th Nov 1910Box 22 \ 5  Scan061
Instruction sheet with a hand-drawn diagram and specifications for a piston.29th Nov 1910Box 22 \ 5  Scan062
Specifications and notes for a Mercedes Engine.26th Nov 1910Box 22 \ 5  Scan063
Technical report to the Directors comparing a recently purchased smaller Mercedes vehicle against their own designs and standards.1st Dec 1910Box 22 \ 5  Scan064
Report comparing engine components and design philosophies of competitors like Mercedes and Metallurgique.1st Dec 1910Box 22 \ 5  Scan065
Dynamometer power test results for a Mercedes engine, including handwritten notes.16th Dec 1910Box 22 \ 5  Scan066
Log sheet detailing the transport and storage movements of a Mercedes vehicle.25th Mar 1911Box 22 \ 5  Scan067
Enquiring when a Mercedes car, reference X407, will be available for sale.2nd Jan 1912Box 22 \ 5  Scan068
Letter from Milnes Daimler Ltd regarding repairs to a Mercedes chassis and a burst wheel cover.3rd Jan 1912Box 22 \ 5  Scan069


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