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 chart from a Vee Belt test on a Ferogrip (Ferodo No. 2) belt.
| Identifier | ExFiles\Box 135\1\ scan0239 | |
| Date | 27th November 1938 | |
| VEE BELT TEST - FEROGRIP (FERODO No 2) REVS PER MIN HOURS HP DIAGRAM No 885 * FAN BROKEN 6 & 1/2 HRS 2 MINS Stop for night "Shattered" at end of test. 1st Adjustment 3/4" on centres 2nd Adjustment 1/4" on centres New Jockey Pulley Flat belt broken Slight noise Flat belt tightened Week end stop Flat belt adjusted no slip Stop Flat belt adjusted no slip Stop for night Adjustment on centres Midday Flat Belt Adjusted Flat belt adjusted No Stop * 24 HOURS 7 MINS (5TH FAN) Fan broken Belt turned over on pulley Cover badly damaged New Fan 1st Adjustment on centres Noisy at commencement PULLEY ANGLE - 35° 30' BELT PERIPHERY - EXTERNAL 43 1/8", INTERNAL 40 1/2" LIFE - 23 HOURS 37 MINS | ||