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).
Test report on Watford IS12 aero magnetos following a 53-hour run on a 714S-13 engine.
| Identifier | ExFiles\Box 43\4\ Scan177 | |
| Date | 19th September 1929 | |
| RR 228 (150 BKS.) (DD 451-8-12-24) MP 306975 X4021 ROLLS-ROYCE LTD. INSTRUCTIONS. To E.T.C. 19 - 9 - 1929 Order No WD{Mr Wood/Mr Whitehead}78 Customer's No. X4021 Watford IS12 aero magnetos. A pair of these magnetos Nos. 98033/4. have run 53 hours in the course of a type test on 714S-13 and would have continued but for a breakdown of the engine. We have examined these magnetos, completely dismantling one of them for inspection, and found them to be in perfect condition. The contact breaker wear on the platinum points was negligible with no signs of burning due to ingress of oil vapour. As a result of this and other tests we have made, our confidence in this new type Watford aero Signed (Contol) This Sheet must be filed on completion of the work. | ||