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).
Performance graph from a Vee Belt test, plotting RPM and HP over time with annotations of test events.
| Identifier | ExFiles\Box 135\1\ scan0238 | |
| Date | 1st November 1938 | |
| Vee Belt Test - Ferogrip (Ferodo No 1) Pulley Angle 35° 30' Belt Periphery - External 43" Internal 40" Life - 5HRS 10 MINS REVS. PER MIN. 4600 4400 4200 4000 Flat Belt retensioned Vee Belt retensioned Jockey Pulley fitted Leather Belt fitted Flat Belt broken Speed fluctuating Test stopped Fan Blade fractured * 8 HRS 12 MINS (4th FAN) Motor speed reduced to reduce amps Alum. Fan Vee Belt turned over on pulley HP 25 20 15 HOURS * Fan Broken DIAGRAM No 880 T. 11. 38 | ||