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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).
Conference memo regarding testing and specifications for low pressure tyres and axle setups on Phantom models.

Identifier  ExFiles\Box 53\2\  Scan273
Date  8th October 1926
  
HS{Lord Ernest Hives - Chair}
44865

To PN{Mr Northey} from BJ.
To CWB from BJ.
To C. from BJ.
To Sg.{Arthur F. Sidgreaves - MD} from BJ.
To Wor.{Arthur Wormald - General Works Manager} from BJ.
To Hs.{Lord Ernest Hives - Chair} from BJ.

Low Pressure Tyres on Phantoms.
BJI/E9/10/26

Notes of Conference 8/10/26. Present: Wor.{Arthur Wormald - General Works Manager})
Rm.{William Robotham - Chief Engineer} ) at Works
BJ. )

Rm.{William Robotham - Chief Engineer} said that 10-EX was tested in France by Hs.{Lord Ernest Hives - Chair}, PN{Mr Northey} and CWB with low pressure tyres, heavy axle, present standard shock absorbers, (with/extra friction), (not hydraulic) and all three agreed this was OK.

12-EX - during recent 10,000 miles test this car had a heavy axle fitted for one day, and ran OK with h-ydraulic absorbers and no/friction/device on steering and 6.75 tyres.

This is similar to what will be standard on the first lot of 6.75 tyred chassis when delivered to customers.

As Dunlops cannot deliver 6.75 tyres until early December it is considered the light axle will come in very soon after, so that only a few chassis will have heavy axle plus 6.75 tyres.

The light axle will give lighter steering, therefore friction can be put on such chassis, but not on cars with the heavy axle.

Therefore S. should satisfy themselves at once whether with heavy axle plus 6.75 tyres the steering is reasonably light or too heavy for customers to use.

The position therefore is that what we suggest giving to customers in December is heavy axle, 6.75 tyres, no friction on steering and hydraulic absorbers. This combination has only been tried by Rm.{William Robotham - Chief Engineer} for part of one day (viz. during the 10,000 miles on 12-EX).

This combination has been run in England by W. officials quite a lot, with heavy bodies.
  
  


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