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).
Experiments on propeller shaft balance to determine noticeable unbalance levels.
| Identifier | ExFiles\Box 94\4\ scan0138 | |
| Date | 12th December 1936 | |
| 337 To E.{Mr Elliott - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} Hs.{Lord Ernest Hives - Chair} Da.{Bernard Day - Chassis Design} Hdy.{William Hardy} Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}7/AP.12.12.36. PROPELLER SHAFT BALANCE. We have experimented on the Cadillac, whose arrangement of gear box suspension represents our suggestions for the unit construction P.3., to determine the amount of unbalance at the front end of the prop.shaft that would be noticeable by a customer. At 6.9 oz. ins. unbalance a period was just detectable at 39 m.p.h. on the overrun. At 9.0 oz.ins. several parts of the car rattled at this critical speed and the period was objectionable. On the present P.3. 1 oz.ins. unbalance would cause customers' complaints. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||