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 issues and suggested modifications for various components of the Wraith model.
| Identifier | ExFiles\Box 148\5\ scan0363 | |
| Date | 30th June 1938 guessed | |
| ITEMS REQUIRING DESIGN ATTENTION. 1. BRAKES - WRAITH. (a) Great difficulty is experienced when assembling brake toggle shaft details into housings, due to presence of felt washers which become badly damaged. (b) Front toggle shaft tail bearing incorporates hardened steel thrust washer with felt packing, whereas on rear brakes where similar conditions prevail, soft washers without felt packing is used. It is suggested that rear brake design be applied to front brakes also. (c) It is impossible to tighten lock nut on front brake toggles due to lack of clearance for spanner. 2. CONNECTING ROD BIG END BUSH - WRAITH. Dowel hole in bearing bush EW.1749 is of elongated form (.250+1 wide x .275+2 long.) It is suggested that circular hole be used in bearing shell and diameter of dowel reduced to give necessary clearance. 3. OIL PIPE. RELIEF VALVE TO FILTER - WRAITH. It is necessary to place pipe in position before fitting Cylinder Block, and pipe cannot afterwards be removed without lifting Cylinder. In addition nut which holds pipe retaining clip to Cylinder is inaccessible and difficult to tighten. 4. CAMSHAFT DRIVE - WRAITH. Lock Washer EW.1627 has a very short tab locating in groove milled on screwed end of Camshaft. This tab repeatedly shears off when tightening Cam Wheel Nut, and requires alteration. 5. DYNAMO DRIVE - WRAITH. Lock Washer EW.1627 gives insufficient range of adjustment. If hexagon bore were swung round slightly in relation to outer holes, additional adjustment could be obtained by turning washer over. 6. EXHAUST PIPE JOINT - WRAITH. Nuts on flanged joint between expansion box and front silencer are very inaccessible due to close proximity of Gear Box Crossmember and Rear Engine Mounting. | ||