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).
Proposing dynamometer and consumption tests for a Packard car to compare it with the 'After-The-War' chassis.
| Identifier | Morton\M22\ img015 | |
| Date | 23th May 1917 | |
| To EH. from R, c. to J.{Mr Johnson W.M.} X.3056 7CA PACKARD R7/B/23.5.17. X.682 - RE "AFTER-THE-WAR" CHASSIS X.435 When the Packard was in Derby, I presume it was never put on the dynamometer, Or I should have obtained a record of the horse power. X.3056 X.2761 It has occurred to me that next time you get hold of this car, and any other car in which we are interested, it would be as well to find the horse power at various speeds until the engine shows a decided falling off in horse power. Then at say 30, or 40 and 50 miles an hour a consumption test should be taken at full power of the engine, 1/2 power at the same speeds, and 1/4 power, and if possible determine what power it absorbs to turn the engine round with the throttle closed. From these figures we should be able to find out the relative consumption of petrol of various cars more accurately than one could read by road tests. We could also find out whether petrol could be saved be weakening the mixture. Again referring specially to the Packard, it will be noticed that it is very much lower geared than our engine, and should therefore pick up rather better and be better on hills. I have not so far noticed any great superiority, although it is very good, but I rather have the impression that the engine soon over-runs itself and the maximum speed of the car is not at all fast, although the consumption is very great. This is what one would expect if the engine failed to fill up well. X.2651 I shall be glad to know how we are getting on with 7 CA and whether any of [...] I am quite willing [...] out as [...] | ||