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).
100-hour engine test detailing fuel mixtures, consumption, and performance over various stages.
| Identifier | ExFiles\Box 36\2\ scan 190 | |
| Date | 10th October 1928 guessed | |
| .contd :- -3- We employed a mixture of 50% Swan, 10% Benzol and 40% Shell Aviation for the throttled stages but towards the end of the 100 hrs. used straight 80/20 mixture which gave better results with regard to the volumetric consumptions. It is possible this would be a more satisfactory fuel and we intend to make an accurate comparison with regard to volumetric and gravametric consumptions. At the end of the first 72 1/2 hrs. run we returned over the stages completing again Stages 3, 4 and 3 hrs. 25 mins. on Stage 5. which was the point at which we stopped during the first run. The petrol consumptions were very good and in pts/hr. from the flowmeter readings shewed a considerable improvement over the first test. Appended is a curve shewing the volumetric consumption compared with similar readings for the first test. These curves shew a volumetric improvement of 3.3%. By actual weight measurements we found we had improved on our previous consumption over this part of the throttle stages (after 20 hrs. 55 mins.) to the extent of 1.2%. It is therefore interesting to observe that after 72 1/2 hrs. running our consumptions were actually more economical which proves the engine is capable of maintaining its effcy. over long periods. A further 6 hrs. 35 mins. were run under the conditions of stages 3 and 4. At the end of this time the engine was opened up to full throttle for one hour to complete Stages 1 and 2. It ran the hour exceptionally well and there was less than 2% difference between the corrected power output at the start of the test and at the end of the 100 hrs. contd :- | ||