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).
Requesting brake specifications for the 20 HP chassis for a new instruction book, with handwritten replies.
| Identifier | ExFiles\Box 5\3\ 03-page179 | |
| Date | 15th September 1925 | |
| Hs.{Lord Ernest Hives - Chair} from BY/N.W. 45940 BY/NW{N. Walker - Patents}2/VM15.9.25. RE 20 H.P. CHASSIS FOUR WHEEL BRAKES Will you kindly let us have the following information regarding the above for inclusion in the new instruction book :- (1). What amount, measured from the top of pedal towards dash, should pedal move just to engage servo? (We say not less than ¼" for New PhantomCodename for PHANTOM I). Also, what should be the clearance on straight side of servo cams when servo just engaged? (for New PhantomCodename for PHANTOM I we say .025.) [Handwritten annotation:] Not Less than .030 (2). What further pedal travel, measured in same manner, should just apply rear brakes? (New PhantomCodename for PHANTOM I 1½"). On the 20 H.P. chassis without front wheel brakes, we say that rear brake cables should move ¾" to 1". Will this still apply? (3). What movement of front wheel brake camshaft lever, by hand, should just apply the brake shoes? [Handwritten annotation:] LEVER ON AXLE .625 (4). Is the distribution of braking the same as on New PhantomCodename for PHANTOM I, namely approximately [struck through] 1/3 to front and 2/3 to rear? [Handwritten annotation:] 33% to front [Handwritten annotation in left margin:] Phantom 40% to front 20 H.P. 33 1/3% to front (5). Should we give hand brake adjustment as before, namely ¾" to 1" movement of cables? [Handwritten annotation:] yes If you have any further notes, information or suggestions, referring, for instance, to any differences between these brakes and those of the New PhantomCodename for PHANTOM I, we should be glad to have them. BY/N.W. [Handwritten signature] | ||