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 10-hour endurance test of the first 'Hawk' engine.
| Identifier | ExFiles\Box 36\2\ scan 062 | |
| Date | 21th January 1916 guessed | |
| x 2935 [Handwritten Notes:] [Struck through: d from EH.] [Struck through: Copy to Mr] [Struck through: to Sg.{Arthur F. Sidgreaves - MD}] to Wor{Arthur Wormald - General Works Manager}, for EH. EF4/W28316. Re. 10 HOURS ENDURANCE TEST OF FIRST "HAWK" ENGINE. On Sunday we took a 10 hours endurance test on the first engine of 75 H.P., as specified in the Admiralty Contract. The results of the tests were as follows:- Average H.P. maintained - 1350 revs. ... 80 H.P. Petrol Consumption - ... .534 lbs. per H.P. hr. Oil Consumption - ... .02 " According to the specification the engine must maintain at least 65 H.P. continuously for 10 hours, petrol consumption not to exceed .55 lbs. per H.P. hour, and oil consumption not to exceed .05 lbs. per H.P. hour. After four and a half hours running the engine had an involuntary stop, due to the failure of the magneto, the report on which I attach. The magneto was repaired and test continued. We also had trouble with oil leaks from the camshaft casing at the rocker arm port holes, due to the camshaft casing getting over-filled with oil, and we were only able to overcome this temporarily by dismantling the existing drain pipe and fixing one of much larger diameter. No involuntary stop. The cause of the camshaft case filling up with oil appears to be due to the absence of the end plug where the speedometer is usually fixed, allowing the oil to flow direct into the case without passing through the camshaft bearings. This point is now receiving attention. It did not develop until after about 3 1/2 hrs. running. The original experimental engine was fitted with a speedometer drive, and was quite O.K. The air pump did not work, which is a point which is now having attention in the Experimental Dept. [Struck through: Should there be any further point to report on after dismantling, as regards its condition, etc. I will report further.] The extra oil supply to crankchamber was cut off. It was found that the engine was amply lubricated without it. Oil | ||