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).
Testing wheel wobble caused by the synchronisation of out-of-balance front wheels.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan143 | |
| Date | 27th August 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}1/LG27.8.25. We have proved by means of the Chronograph in connection with your suggestion that when both front wheels are an equal amount out of balance, wobbles will build up when the out of balance of the two wheels is diametrically opposite and die out when the out of balance is in step. TEST TO DETERMINE IF SYNCHRONISATION OF OUT OF BALANCE OF TWO FRONT WHEELS AFFECTS WOBBLES. Originally an attempt was made to do this by adjusting the effective tyre dia. of each front wheel to be the same. As different tyre pressures were required for each tyre, however, centrifugal force altered these effective diameters in different degrees. Hence the out of balance weights would not keep their original relative positions at high speeds. Present method - (A) is contact finger fixed to the carrier of each brake in the same position - (B) a contact strip which rotates with drum in line radially with out of balance weight (C). Both fingers connected to one Chronograph pen. When weights are in step, one break is made per rev. When diametrically opposite, Two equally spaced breaks per rev. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||