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).
Experiment No. 434, detailing the results of an obstacle track test on a competitor's Napier car.
| Identifier | ExFiles\Box 23\2\ Scan017 | |
| Date | 7th May 1913 | |
| From Exp. Dept. Copies for: Mr Johnson. Mr Royce. Mr Spinney. Mr Nadin. X 437 Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}9/L7513 7th.May 1913. Report on Experiment No. 434 Tests of Napier Car by running over obstacles on the track in a similar manner to our own Pivot Tests. Speed. 1.1lap per minute. 37 obstacles per lap. Time running in minutes. 60 Near side front shock absorber arm twisted and the connecting joint broke away. 25 Off side did likewise. 60 Vertical pull rod on footbrake broke off at the beginning of the screwed part. (This seems to be a weak spot as we recently came across a Napier car 3 months old with this part broken in the same place). 60 Pivots etc. O.K. 60 " " " 60 " " " 15 Both silencer straps broke. 60 Pivots etc. O.K. 60 " " " 30 " " " 10 hrs 10 mins. The only parts which seem to have suffered are the | ||