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).
Proposals for a new rear brake design to be trialled on the Phantom model.
| Identifier | WestWitteringFiles\O\January1926-March1926\ Scan36 | |
| Date | 1st February 1926 | |
| TO DA.{Bernard Day - Chassis Design}) BY.{R.W. Bailey - Chief Engineer}) HS.{Lord Ernest Hives - Chair}) FROM R.{Sir Henry Royce} & E.{Mr Elliott - Chief Engineer} (Le CanadelHenry Royce's French residence.) C. to - CJ. BJ. RG.{Mr Rowledge} ORIGINAL R2/M4.2.26. EAC. 7. REAR BRAKES. X7360 These could go on trial with Phantom, but we are trying another design for the following reasons - simpler and lighter, ferodo for hand brake, better cooling of hand brake drums - (1) Side by side are best and simplest, as in 20HP., but improvements may be possible. (2) Both one width for many reasons: interchangeable hand brake requires surface for excessive load, foot brake for wear. (3) Foot brake nearest wheel. (4) Operating shaft seems definitely to ask to be behind axle, though they may get close to petrol tank, but levers and rods better disposed - that is, unlimited movement. (5) The two operating shafts at least 2" apart centres, (with hold off springs btwn perhaps) so the same scheme of adjustment as front brakes. (This should also be tried on the 20HP.) (6) Drum decreased to 16" dia., and not more than 4" overall width. (7) Support made of duralumin forging and two duralumin pressings somewhat thus:- (8) Shoes made of duralumin forgings. (9) A stepped drum although stiffer is troubled by end clearances. Side by side is good as drum can over-run shoes, and in many ways is simpler and better for (1) | ||