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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).
New system for checking the springing of PII chassis based on average loading for different body types.

Identifier  ExFiles\Box 43\2\  Scan277
Date  3rd April 1931
  
COPY

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April 3, 1931.

To: Mr. Ross
Cc- Mr. Caswell
Mr. Spencer
Mr. Beck
From: Mr. Burton
Re: Springing of PII Chassis.

The springing of PII chassis will necessarily have to be checked in a rather different manner from previously.

The following system is designed to give a car which rides with the frame "level" with average loading.

For this purpose "average" loading is taken as below for the various body types:

7 Pass. Types
Huntington
St.{Capt. P. R. Strong} Andrew
St.{Capt. P. R. Strong} Regis
Max. Av.
Front Pass. 2 2
Inter Pass. 2 -
Rear Pass. 3 2
Luggage - Lbs. 300 200

5 Pass. Types
Dover
St.{Capt. P. R. Strong} Martin
Max. Av.
2 2
2 -
3 2
300 200

4 Pass. Types
Coupelet
Max. Av.
2 2
- -
2 1
120 75

From this basis we can formulate a rule for obtaining the flat spring load.

Weigh the car front and rear with all fittings, spares, accessories, full tanks and radiator, but no passengers or luggage. No trunk where such is detachable. The spring weights (when flat) are given by the following tables:

7 Pass. or 5 Pass.
Front Front weight - 350 / 2
Rear Rear weight + 360 / 2

Coupelet
Front Front weight - 260 / 2
Rear Rear weight / 2

Rubber Clearances.

The correct height should be checked from rubber clearances.

- Continued -
  
  


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