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).
The performance of Goshawk-11 electrical units after a 10,000-mile test.
| Identifier | ExFiles\Box 180\M1\2\ img004 | |
| Date | 12th May 1922 | |
| To CJ. for R.{Sir Henry Royce} from EFC. c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to Wor.{Arthur Wormald - General Works Manager} c. to PN.{Mr Northey} ORIGINAL. EFC1/LG12.5.22. REPORT ON 5-GOSHAWK-11 ELECTRICAL UNITS AFTER 10,000 MILES TEST, AND ON GOSHAWK ELECTRICAL UNITS GENERALLY. X.4338. (handwritten: Vu338) AMMETER - Weston. This has been tested for calibration etc. and found to be O.K. BATTERY - C.A.V. Willard 12XR2. The battery appears to be in first-class condition. There is a slight indication however judging from a subsequent high rate discharge test, that the internal resistance has suffered a slight increase. It has been mentioned to us by battery makers who are not at liberty to use the threaded rubber separators, that these get choked up in time, thus increasing the internal resistance. Of this we have no definite experience so far. 4-Goshawk-11 with R.{Sir Henry Royce} is fitted with a similar battery, but 6-7-Goshawk-11 are fitted respectively with Exide and F & R batteries and so far no complaints have been received of these on the road. BATTERY BOX. With the exception of the point about the failure of the suspension mentioned by HY{Tom Haldenby - Plant Engineer}, this appears to have stood the test very well except that the outside of the box has been considerably weathered by the abrasive dusty sand. The terminals and connections have not suffered by corrosion. It is urged that the terminal nuts on the outside of the box should be increased in size and this point we believe, has had attention. BATTERY IGNITION - Ballast resistance. This has been examined and appears to be O.K. in every way. Coil. This also appears to be O.K. in every way. Condenser. The condenser has been tested for capacity etc. and the result shows a capacity equal to the lower specified limit and in other respects the condenser to be O.K. Contact breaker and distributor contact points, and sparking points. The contact breaker and distributor have behaved very well on this car, in fact, the ignition has really given no trouble. There were signs of water inside the cover and a slight corrosion on the top of the cam under the H.T. rotor. This will probably be due to a slight electrical discharge ozonising the entrapped air, but this is probably of no consequence. The contact points were slightly dirty from burnt oil or grease. The rocker arm point (negative) had a considerable hump fitting into a corresponding recess in the screw point (positive). The make ratio had altered from .5 to .44 and the gap at break from .016" to .010", indicating that the wear on the rubbing block was contd:- | ||