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).
The particulars of the Phantom III experimental fan drive.
| Identifier | ExFiles\Box 94\5\ scan0008 | |
| Date | 3rd September 1936 guessed | |
| Particulars of Phantom III Experimental Fan Drive. Distance between Pulley centres 13.40" Speed ratio required 1.125 : 1 Maximum speed of driving pulley 4500 R.P.M. H.P. to be transmitted at maximum speed 12 H.P. approx. Maximum permissible external dia. of driving pulley 5.700" approx. | ||