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).
Requesting the manufacture of a modified B.80 fan with a zero blade angle at the tip.
| Identifier | ExFiles\Box 135\4\ scan0039 | |
| Date | 22th August 1939 | |
| 1135 & 1DHH To HPS.{Horace Percy Smith - Experimental Factory Mgr} c. to HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth} c. to Rm{William Robotham - Chief Engineer}/ABR.{A. B. Roberts} Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards}8/JH:22.8.39. Fans. Will you please make up a B.80 fan with the tips of the blades in the plane of rotation. The root of the blades should be maintained as at present and the blade gradually twisted to give zero blade angle at the tip, Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards} will supply any further details. Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards} | ||