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 graph of power absorbed by various cooling fans for Unit 1 B IV.
| Identifier | ExFiles\Box 90a\2\ Scan286 | |
| Date | 12th September 1933 | |
| COMPARISON OF POWER ABSORBED BY VARIOUS COOLING FANS. B.V.I UNIT 1 B IV BENTLEY RADIATOR & BONNET RIGGED UP OVER ENGINE REAR END OF BONNET BLANKED TO REPRESENT DASHBOARD TEST BED EXHAUST SYSTEM. NO FAN CHRYSLER FAN PEREGRINE FAN STANDARD 20/25 FAN H.P. R.P.M. B.M.E.P 12.9.33 | ||