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).
Issues and potential improvements for Goshawk engine brakes, focusing on materials and mechanical design.
| Identifier | WestWitteringFiles\H\January1922\ Scan14 | |
| Date | 19th January 1922 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. To ( HS{Lord Ernest Hives - Chair} ✓ DA{Bernard Day - Chassis Design} ) from R.{Sir Henry Royce} c. to CJ c. to Wor.{Arthur Wormald - General Works Manager} c. to PW. c. to By.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to E.{Mr Elliott - Chief Engineer} c. to Hy{Tom Haldenby - Plant Engineer} ORIGINAL. R2/M19.1.22. BRAKES (GOSHAWK) AND GENERAL. X4259 X4257 Wear of the brake drums may be due to rivets in the ferrodo lining; possibly copper or aluminium ones would be safest, not steel or brass. Also materials may be unsuitable steel, too soft, or ferrodo containing metal or grit. Squeak may be due to resinous substance in lining, or want of rigidity of brake drums, or fixing of anchorage. Our strap anchor should be good: we avoid overhanging pins. A pair of more rigid drums with ribs might be tried, or possibly an aluminium drum with tyre steel liner. This may have some terrible fault but probably would not squeak, and might be light: try Raybestos linings. Also squeaking may be due to rivets or metal becoming imbedded in ferrodo. Flexibility of compensating shafts have become rather more than desirable because the shafts have too long levers and are not used through a sufficiently big angle for the operation. This is a fault which has come into the designs before this time, owing to limitations. Had I known this I should have found a way out. At present the best way is to shorten the driven lever upon the differential by about 20% (3" less 20% = 2.4), and increase the dia. of the shafts from 7/8" to 1", keeping the thickness 1/8". The value of this small alteration reduces the torsional (1) | ||