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 test of Ferodo brake linings with varying positions on brake shoes.
| Identifier | ExFiles\Box 26\4\ Scan191 | |
| Date | 4th December 1923 | |
| R.R. 493 (4d H) (SL 42 12-7-23). J.H.D. X3409 EXPERIMENTAL REPORT. x4257 COPIES TO: R.CJ. BJ. WOR.{Arthur Wormald - General Works Manager} By.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} EP.{G. Eric Platford - Chief Quality Engineer} PN.{Mr Northey} OY. Expl. No. 3409 3539. REF. hsl/T4.12.23. OBJECT OF TEST. TESTER. Test of Ferodo brake linings with varying positions on brake shoes. R.{Sir Henry Royce} Bolton. 20 H.P. CONDITIONS. Initial engine revs. per min. ----- 1500 Initial brake drum R.P.M. ------- 473 Final engine R.P.M. ------------- 1000 Final brake drum R.P.M. --------- 315 } For each test. All readings taken with drum cold and cooled with constant flow of water while running. No springs fitted to shoes. SUMMARY OF TEST. B = both shoes. W = wrapping shoe only. N = Non-wrapping shoe only. TABLE DATA: Wt. in lbs. to obtain constant brake Standard shoes. (4) B: 18, 16, 18, 19 1/2, 18 W: 12, 12, 11, 13, 13 N: 31, 29, 32, 27, 27 Ferodo at centre of shoe only. (3) B: 16, 15 1/2, 14 1/2, 15, 15 W: 10, 8 1/2, 8 1/2, 10, 10 N: 31, 31, 32, 32, 31 Ferodo at pivot end only. (2) B: 20, 20, 18, 20, 20 W: 13, 12, 13, 13, 15 N: 44, 44, 44, 44, 44 Ferodo at toggle end only. (1) B: 22, 23, 23, 23, 23 W: 7, 7, 8, 7, 6 1/2 N: 32, 32, 32, 31, 31 Average Wt. lbs. Standard shoes (4) Averages: B: 17.9 W: 12.2 N: 29.2 Ferodo at centre of shoe only (3) Averages: B: 15 W: 9.4 N: 31.4 Ferodo at pivot end only (2) Averages: B: 19.6 W: 13.2 N: 44 Ferodo at toggle end only (1) Averages: B: 22.8 W: 7.1 N: 31.6 Hs.{Lord Ernest Hives - Chair} | ||