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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).
Comparison of the particulars for the Ph.III and Cadillac fans.

Identifier  ExFiles\Box 145\1\  scan0168
Date  18th June 1936 guessed
  
Particulars of Fans.

Ph.III Fan.

(1) No. blades. 4
(2) Dia. of tip circle 20"
(3) Dist. of forward tips from matrix. 1 1/2"
(4) " rear " engines. 3"
(5) Depth of blade (approx.) 1 1/2"
(6) Width " " 3 1/2"
(7) Fan speed/engine speed ratio .89 : 1

Cadillac.

(1) No. blades 5
(2) Dia. of tip circle 20"
(3) Dist. of forward tips from matrix 1 1/2"
(4) " rear " engine. 4
(5) Depth of Blade, (Approx.) 2 1/2"
(6) Width " " " 3 1/2"
(7) Fan speed/engine speed ratio 1.14 : 1
  
  


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