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).
Test report on the 'Hawk' engine, detailing power, consumption figures, and modifications for airship use.
| Identifier | ExFiles\Box 36\2\ scan 079 | |
| Date | 1st October 1919 | |
| R.R. 235a (500 T) (S.D. 408. 28-4-17.) Bm. 2/156/13. -2- EH1/LGS.10.19. Contd. The average power and consumption of the last series of "Hawks" was as follows:- REVS. HP. Cons. lbs.per HP. hour. Remarks. 1900 100 Slow running, 285 r.p.m. 1800 100 (this is with Remy 1700 99 ignition). 1600 97 .520 Consumption 9/10 1500 92 .514 throttle 1500 r.p.m. 1400 88 .514 .57 lbs. per HP. hour. 1300 83 .522 1200 78 1100 69 1000 62 The "Hawk" engines om the Airship have 25 ft. head of the petrol, the tanks are up in the envelope. We have reduced the hole in the seeting to work with this high pressure and so that it will not flood at 12 or 14 lbs pressure. The air inlet is made so as to admit air at each side, this we found was necessary. We made a test on the "Hawk" with a longer ramming length and got the following results:- | ||