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).
Experimental modification to the bonnet involving the replacement of a brass wearing strip with a Ferodo strip.
| Identifier | ExFiles\Box 74\1\ scan0180 | |
| Date | 12th May 1921 | |
| X4340 To R.H. from BY/Shn. c. to EFC. c. to Da.{Bernard Day - Chassis Design} c. to MB. STAMPS: EFO 18, EXPERIMENTAL, RECEIVED BY/Shn8/DB.{Donald Bastow - Suspensions}12.5.21. X.4340 - 40/50 CHASSIS - BONNET. FERODO STRIP LACED IN SUPPORTING ANGLE. Please receive herewith blueprints in duplicate of each of the following drawings, detailed from "N" Scheme 827:- E.20219 - Lacing Strip. E.20220 - Bonnet Side Rest Angle L.H. E.20221 - Bonnet Side Rest Angle R.H. Will you please instruct up three sets of these parts to be used in connection with the laced Bonrest detailed from "N" Scheme 769, as instructed in our memo BY/Shn5/DB.{Donald Bastow - Suspensions}18.3.21. These parts should be completed with 3 sets of the following:- E.20140 - Tubular Rivet. - 16 off. K.2601 - C's'k Screw. - 16 off. K.4301 - Lock Nut. - 16 off. } per set. K.4401 - Plain Washer. - 16 off. K.4503 - Grover Washer. - 16 off. With this experiment the inner brass wearing strip E.5867 is removed, and a 30° chamfer added along the inner bottom edge of the bonnet side plates, as shown in the sketch below:- [Sketch of a cross-section of a bonnet side plate and outer strip] HANDWRITTEN ANNOTATIONS ON SKETCH: Bonnet Side Plate Inner Brass Wearing Strip removed Outer Strip 30° .050 BY/Shn. SCLS | ||