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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DescriptionDateIdentifier
Summary log of frame failures observed during dome testing, with six accompanying sketches illustrating the crack locations.1st Apr 1924Morton \ M20.2  img009
The 20 HP radiator and shutters.4th Apr 1924Morton \ M20.2  img010
Water boiling complaints for the 20 HP model and the recommendation for a new radiator with thermostat-operated shutters.1st Apr 1924Morton \ M20.2  img011
Installation and vibration issues of an E.A.C. engine.1st Apr 1924Morton \ M20.2  img012
Obtaining data for an exhaust system to be used on EAC 111.5th Apr 1924Morton \ M20.2  img013
Carburetor tests in France, detailing issues with steering, road wheels, and brakes.11th Apr 1924Morton \ M20.2  img014
Complaint of 'jaggers' on front brakes and a proposal to adjust the front/rear braking effectiveness.11th Apr 1924Morton \ M20.2  img015
40/50 steering, comparing centre-point steering with modified pivot lean.11th Apr 1924Morton \ M20.2  img016
Steering wind-up, front wheel brake tests, and pivot pin bush issues.11th Apr 1924Morton \ M20.2  img017
The losses in a flat disc type servo.14th Apr 1924Morton \ M20.2  img018
Tests with car EAC.11 in France, concerning a modified front axle on a 40/50 HP pivot lean car.16th Apr 1924Morton \ M20.2  img019
Secret cover memo for attached tests conducted on a WW. slow speed servo.17th Apr 1924Morton \ M20.2  img020
Tests conducted on an improved slow-speed servo.7th Apr 1924Morton \ M20.2  img021
The testing of the M.DES.60 brake scheme on a mock-up car.23th Apr 1924Morton \ M20.2  img022
Tests and alterations performed on the RRM scheme 4-wheel brake system.20th Mar 1924Morton \ M20.2  img023
The performance of different braking schemes and servo modifications.28th Apr 1924Morton \ M20.2  img024
The operation and feel of a servo-assisted brake pedal mechanism.20th Mar 1924Morton \ M20.2  img025
Comparing the 'agreed' brake servo scheme with the Hispano system.28th Apr 1924Morton \ M20.2  img026
The M. DES. 60 braking scheme, detailing a fault with the servo, modifications tested, and a comparison with other four-wheel brake systems.28th Apr 1924Morton \ M20.2  img027
Secret report on the inefficiency and weakness of the Hispano servo motor.29th Apr 1924Morton \ M20.2  img028
The RRM braking scheme and issues with brake jaggers.1st May 1924Morton \ M20.2  img029
Comparing brake lag and servo 'wind-on' between the RRM and Hispano schemes.5th Sep 1924Morton \ M20.2  img030
Methods to eliminate brake judder and the results of related tests.1st May 1924Morton \ M20.2  img031
Secret memo proposing a comparative test of different 4-wheel brake schemes on various cars.1st May 1924Morton \ M20.2  img032
Comparison table of front wheel brake schemes, detailing servo performance and wear characteristics.29th Apr 1924Morton \ M20.2  img033
Diagram illustrating the linkage and calculations for a four-wheel servo-assisted braking system.24th Nov 1924Morton \ M20.2  img034
Schematic of a servo-assisted braking system showing linkage dimensions and pressure calculations.30th Apr 1924Morton \ M20.2  img035
Schematic diagram of a servo-assisted braking system with calculations.30th Apr 1924Morton \ M20.2  img036
Tests to reduce over-run vibrations in an EAC engine using longer connecting rods.3rd May 1924Morton \ M20.2  img037
Scored rear brake drums on 40/50 HP cars and a fatigue fracture in a cross steering tube.1st May 1924Morton \ M20.2  img038
On testing a modified servo brake system, comparing its performance and design to the Hispano system.9th May 1924Morton \ M20.2  img039
The performance of Nickel-Iron (Ni-Fe) and Alklum alkaline batteries for potential standardisation.15th May 1924Morton \ M20.2  img040
Four-wheel brakes, investigating steering issues and side diving caused by unequal front braking on the 40/50 HP model.15th May 1924Morton \ M20.2  img041
Steering behaviour and brake application, comparing a car with and without a torque arm.5th May 1924Morton \ M20.2  img042
The tendency of the steering wheel to turn under braking conditions and associated component tests.15th May 1924Morton \ M20.2  img043
Steering issues caused by weak springs and a proposal for optimal initial load adjustments.1st May 1924Morton \ M20.2  img044
The bench tests of a Scintilla Magneto Type AM-6-A.5th May 1924Morton \ M20.2  img045
Figures taken in connection with twists of the front axle using different spring types.17th May 1924Morton \ M20.2  img046
The measurement of front axle twist due to braking.17th May 1924Morton \ M20.2  img047
Brake linkage scheme, discussing torque multiplication and servo distribution ratios.12th Jul 1923Morton \ M20.2  img048
The efficacy and disadvantages of using floating bushes for steering pivots.21th May 1924Morton \ M20.2  img049
The policy and performance of four-wheel brakes.20th Aug 1924Morton \ M20.2  img050
The dangers of locked wheels and unequal braking, particularly on wet roads.21th May 1924Morton \ M20.2  img051
The variation in braking performance between different cars using the same braking system.21th May 1924Morton \ M20.2  img052
10,000-mile test in France, detailing issues with body rattles and the durability of the coachwork.20th Mar 1924Morton \ M20.2  img053
Note on the considerable braking variation between cars, despite using the same brakes.21th May 1924Morton \ M20.2  img054
List of complaints and suggested improvements following a 10,000-mile test in France.23th May 1924Morton \ M20.3  img001
Complaint regarding the hood, its retaining pins shearing, and sockets coming loose.23th May 1924Morton \ M20.3  img002
Fitting a spring to the E.A.C. clutch to improve clutch brake performance.23th May 1924Morton \ M20.3  img003
Servo-assisted brake performance, detailing modifications to cam angles and reduction ratios.24th May 1924Morton \ M20.3  img004
Front braking, detailing issues with servo clearance adjustment and component failures.24th May 1924Morton \ M20.3  img005
Analysis of the AM-6-A Scintilla magneto for the E.A.C.2, comparing its performance characteristics to a Watford magneto.26th May 1924Morton \ M20.3  img006
Comparison of Scintilla, Watford, and Conner magnetos regarding slow-speed sparking performance and the formulation of a new specification.26th May 1924Morton \ M20.3  img007
Preliminary tests of an EAC fixed choke carburetter.12th Jul 1923Morton \ M20.3  img008
Experiments with a Knave carburetter, detailing mixture adjustments and continued tests on needle valves and vaporisers.29th May 1924Morton \ M20.3  img009
Performance data comparison for E.A.C. Fixed Choke and Knave type carburetters, with a diagram of an air valve deflector alteration.29th May 1924Morton \ M20.3  img010
Tests to prevent brake jaggers.1st Jun 1924Morton \ M20.3  img011
Front axle braking torque damping.20th Mar 1924Morton \ M20.3  img012
Axle 'jaggering' (vibration) and twist under various frictional conditions.20th Aug 1924Morton \ M20.3  img013
Adopted scheme for brakes, detailing leverage and servo modifications.4th Jun 1924Morton \ M20.3  img014
Issues with brake servo noise and heavy steering.4th Jun 1924Morton \ M20.3  img015
Comparison table of different brake scheme specifications and performance metrics.4th Jun 1924Morton \ M20.3  img016
Blueprint diagram and table detailing an adopted servo braking scheme and torque multiplication.4th Jul 1934Morton \ M20.3  img017
'Rectaskid' anti-skidding fittings.11th Jun 1924Morton \ M20.3  img018
Concluding against the use of a 'Rectaskid' anti-skid device due to poor performance and negative side effects.20th Mar 1924Morton \ M20.3  img019
Experimental secret report on the performance and wear of four-wheel brake systems.6th Jun 1924Morton \ M20.3  img020
Continuation page of a document discussing ineffective brakes on cars.6th Jun 1924Morton \ M20.3  img021
The performance and faults of four-wheel brakes on two cars after 3000 miles of testing in France.6th Jun 1924Morton \ M20.3  img022
Modifications to brake drums to eliminate 'jaggers', and noting issues with water boiling and steering wobble.16th Jun 1924Morton \ M20.3  img023
Four-wheel brake axle control system designed to overcome 'jaggers' and improve braking characteristics.16th Jun 1924Morton \ M20.3  img024
Complaint of grease leaking from front hubs onto the four-wheel brakes.8th Jun 1924Morton \ M20.3  img025
Four-wheel brake tests, specifically concerning the stiffness of levers and the countershaft mechanism.8th Jun 1924Morton \ M20.3  img026
Diagram illustrating the motion of levers when a brake pedal is depressed, suggesting a modification to a solid shaft.19th Jun 1924Morton \ M20.3  img027
Testing specially cut worm gears to reduce noise from the four-wheel brake servo system.19th Jun 1924Morton \ M20.3  img028
Page discussing issues with drive shaft impulses and pedal pressure on the braking system.19th Jun 1924Morton \ M20.3  img029
Brake and steering tests in France, detailing issues with the steering taking charge when braking on full lock.26th Jun 1924Morton \ M20.3  img030
4-wheel brakes, servo output, and low-speed steering wobbles.26th Jun 1924Morton \ M20.3  img031
Tests conducted to reduce noise and vibration from servo gears.27th Jun 1924Morton \ M20.3  img032
Front spring failure during brake tests in France.30th Jun 1924Morton \ M20.3  img033
Tests carried out in France on front wheel brakes in 1924.22th Dec 1924Morton \ M20.3  img034
Page 2, detailing failures of wire-netting, wheel carriers, engine valves, and oil pipes.25th Sep 1924Morton \ M20.3  img035
Page discussing crankcase expansion, petrol system issues due to water, and engine bearing failure from oil loss.25th Sep 1924Morton \ M20.3  img036
Series of tests on EAC.111 cars in France during 1924.30th Dec 1924Morton \ M20.3  img037
Test report detailing troubles and remedies for the High Speed Servo on a 40-PK car.25th Sep 1924Morton \ M20.3  img038
Test report number 11 on the Cone Clutch Type Servo for the 99-MK car, detailing troubles, mileage, and remedies.25th Sep 1924Morton \ M20.3  img039
Logging troubles and remedies during a test on a 9-PK car's clutch servo.25th Sep 1924Morton \ M20.3  img040
Test report detailing troubles, mileage, and remedies for the Cone Clutch Type Servo - 98-HK Car.25th Sep 1924Morton \ M20.3  img041
Test report for the semi-servo system on car 98-NK, listing issues found, mileage, and their resolutions.25th Sep 1924Morton \ M20.3  img042
Logging vehicle component failures, causes, and remedies at various mileages.25th Sep 1924Morton \ M20.3  img043
Logging troubles, mileage, and remedies for a 35-PK car during Test No. V.25th Sep 1924Morton \ M20.3  img044
Troubles encountered with the 35-PK car after fitting new front springs.25th Sep 1924Morton \ M20.3  img045
Final test report on an adopted brake scheme for the 9-PK car, detailing troubles and remedies.25th Sep 1924Morton \ M20.3  img046
Test report sheet detailing failures on cars 9-PK & 98-NK fitted with stiffer Woodhead front springs.25th Sep 1924Morton \ M20.3  img047
Test report on 12 1/2% stiffer front springs for a 98-NK car, noting component failures and unsatisfactory results.25th Sep 1924Morton \ M20.3  img048
Test report sheet listing troubles, mileage, and remedies for a vehicle fitted with stiffer front springs.25th Sep 1924Morton \ M20.3  img049
Dunlop Balloon Tyres, detailing test results including a broken windscreen and steering wobbles.25th Sep 1924Morton \ M20.3  img050
Test report on re-designed stiffer front springs for a 9-FK car, detailing troubles, mileage, and remedies.25th Sep 1924Morton \ M20.3  img051
Policy on the Universal Gearbox for B.III cars.1st Nov 1937Morton \ M21  img001
Improvements to piston design, including skirt length and spring pressure.24th Sep 1919Morton \ M21  img002
Hurried inspection report on a 10 HP Fiat car, listing eleven points of concern.23th May 1922Morton \ M21  img003


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