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).
Investigation into perished and cracked Phantom II Magneto H.T. wiring due to heat issues.
| Identifier | ExFiles\Box 168\1\ img153 | |
| Date | 6th June 1934 | |
| S6117 E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Wst. c. to By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Wst.2/MA.6.6.34. Re. Phantom II Magneto H.T. Wiring. When the H.T. wires were removed from 28-EX following the last 10,000 mile test, it was discovered that the rubber dielectric was badly perished and cracked. Upon investigating the matter further we found that :- (a) An exhaust heat shield had not been fitted. (b) A Steel tube had been fitted in place of aluminium. (c) This arrangement was representative of present production. We accordingly removed the wires from Experimental Chassis 20-EX and 22-EX, both of which have done a considerable mileage and which had the old aluminium tube and exhaust heat shield. Both sets of wires were in very good condition and shewed no signs of cracking. Deleting the exhaust shield and fitting a steel tube which is considerably less conductive to heat than aluminium, is therefore a retrograde step and has not been covered by a standardisation sheet. We have fitted up 20-EX and 22-EX with standard steel tubes and exhaust heat shield to ascertain if this combination is successful but in the meantime we consider production should revert to the arrangement which has proved satisfactory, i.e. aluminium tube and exhaust heat shield and we are issuing a standardisation sheet accordingly. Hs{Lord Ernest Hives - Chair}/Wst. | ||