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).
Specification sheet comparing the particulars of a 'Ph.III Fan' and a 'Cadillac' fan.
| Identifier | ExFiles\Box 155\1\ scan0239 | |
| 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 1.12 : 1 (crossed out) .89 : 1 | ||