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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).
Letter detailing jack dimension requirements for Phantom and 20 HP chassis and a comparison with mechanical jacks.

Identifier  ExFiles\Box 26\3\  Scan045
Date  15th November 1927
  
4317

Expl: Dept:

Hs{Lord Ernest Hives - Chair}/AJLL/LG.
15th. Nov. 1927.

W. Roy{Sir Henry Royce} Bridgens Esq.,
Brookside Motors,
15-17 St.{Capt. P. R. Strong} Ann Street,
Manchester.

Dear Sir,

With reference to your verbal enquiry, we shall be very pleased to receive for testing purposes any hydraulic jack which you care to submit to us.

The following jack dimensions are necessary to meet the present requirements of our chassis.

(a) Phantom Chassis.
Minimum height.................... 6.250"
Initial lift (by hand adjustment).. 2.750"
Mechanical or hydraulic lift........ 7.500"
Maximum height.................... 16.500"

(b) 20 HP. chassis.
Minimum height.................... 6.250"
Initial lift (by hand adjustment).. 2.500"
Mechanical or hydraulic lift........ 6.000"
Maximum height.................... 14.750"

Our experience with hydraulic jacks to date, has led us to form the following conclusions, when compared with mechanical jacks.

(1) Ease of manipulation - definitely superior.
(2) Dimensions - necessary dimensions more difficult to obtain.
(3) Weight - excessive.
(4) General - all hydraulic jacks we have tested have suffered from oil leaks.
(5) Cost - the higher cost of the hydraulic jack is not proportionate to its superiority
  
  


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