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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).
Recommendation on radiator tube selection for the S.S. model based on comparative cooling capacity tests.

Identifier  ExFiles\Box 24\5\  Scan191
Date  7th August 1929
  
X766

To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}

Copy to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager}
" " BY.{R.W. Bailey - Chief Engineer} Da.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer}
" " OY. Hm.{Capt. W. Hallam - Head Repairs}

Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}3/BE7.8.29.

X7250
X766

S.S. RADIATORS.

We have made a careful comparative test of
the 6/7 m.m. tubes and the 5 1/2/7 m.m. tubes on the S.S.,
and the results show that there is no measurable difference
in the cooling capacity of the radiator with the tubes
giving the wider water spaces.

We therefore recommend that these tubes should
be used for the S.S. and for all replacements in the case
of radiators having integral shutters and tubes 4.25" long.

HS{Lord Ernest Hives - Chair}/Rp.
  
  


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