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).
List of design modifications for the Wraith III chassis.
| Identifier | ExFiles\Box 6\6\ 06-page137 | |
| Date | 17th February 1937 | |
| SECRET C.Rv.RIG.Pa.{Mr Paterson} Dr. HPS.{Horace Percy Smith - Experimental Factory Mgr}S/Rh.{R. Hollingworth} W/1d.4/HP.17.2.37. Wraith III. Further to E/14d.3/HP.27.1.37, we give below a list of items which have received design attention since 27.1.37 with the object of reducing cost or of overcoming troubles experienced during the building of the first chassis. (1) Provision of bifurcated rivetting on all brake shoes - memo - E/HDY.{William Hardy}4/HP.11.2.37. (2) Mod. to lower triangle outer bearing to facilitate dismantling and erection - N.Sch.5021 issued 1.2.37. (3) Parallel instead of taper location for brake operating fulcrum pin on yoke piece - N.Sch.5015 issued 3.2.37. (4) Servo damper piston in brass instead of in stainless steel - Memo E/HDY.{William Hardy}2/HP.25.1.37. (5) Nuts on 2nd speed pinion to be standard lock nuts in place of special nickel steel nuts - memo/E/HDY.{William Hardy}2/HP.9.2.37. (6) Mod. to clear foul in front suspension spring pot. N.Sch. 5013 issued 26.1.37. (7) Reduced gauge of rear brake carrier plates - memo E/HDY.{William Hardy}4/HP.9.2.37. (8) Mod. to rivetting of dust cover on front brakes to avoid foul - Memo E/EV.{Ivan Evernden - coachwork}1/MN.8.2.37. (9) Mod. to clamping bolts and nuts on upper triangle outer bearing - N.Sch.5034 issued 8.2.37. (10) Mod. to rear roll rod to suit Phantom III rear axle casing LeC.5501 issued 2.2.37. (11) Mod. to side steering tube end/cap to reduce cost - N.Sch. 5036 issued 9.2.37. (12) Mod. to finish of connecting wire of front brake pull off spring - memo E/EV.{Ivan Evernden - coachwork}1/MN.8.2.37. (13) Mod. to front brake shoes to prevent brake drum liner lock plates from fouling the brake shoes and liners - memo E/EV.{Ivan Evernden - coachwork}1/MN.8.2.37. (14) Deletion of oil pipe clip on yoke piece - memo E/EV.{Ivan Evernden - coachwork}1/MN. 8.2.37. (15) Lightened front suspension forging - N.Sch.5018-issued 27.1.37. (16) Mods. to brake rods to improve accessibility of jaws - memo E/HDY.{William Hardy}1/HP.3.2.37. (17) Synchromesh cones in cast iron instead of bronze - memo E/HDY.{William Hardy}2/HP.2.2.37. (18) Actuating sleeves for top and 3rd speeds in cast iron - memo E/HDY.{William Hardy}2/HP.2.2.37. (19) Stirrups for 2nd and 3rd speed gears in W/M - E/HDY.{William Hardy}2/HP. 2.2.37. (20) Actuating rods and nuts on hand brake lever-delete chromium plating - E/HDY.{William Hardy}1/HP.20.1.37. (21) Mods. to forks of Hardy Spicer type propeller shaft to facilitate assembly - N.Sch.5019 issued 27.1.37. (22) Rear axle of Wraith proportions - designs N.Sch.4954,5014 issued 1.2.37. | ||