Dynamometer power test results for the Goshawk 11 engine, including general running observations.
| Identifier | ExFiles\Box 180\M1\1\ img002 | |
| Date | 1st August 1921 | |
| 1st GTT engine. Dyno Power tests. ORIGINAL THIS DOCUMENT MUST BE KEPT IN THIS OFFICE To R. {Sir Henry Royce} from Hs. {Lord Ernest Hives - Chair} c. to CJ. c. to E. {Mr Elliott - Chief Engineer} c. to Da. {Bernard Day - Chassis Design} c. to EY. c. to Wor. {Arthur Wormald - General Works Manager} *GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 11* X4219 General running. We have run this engine now about 25 to 30 hours and have carried out a number of tests. This first impression of the engine is very pleasing. The valve operating mechanism is very good for silence. The engine allround is a very great advance on Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 1. Horse Power Tests. H.P. Revs. | No exhaust pipe or hot spot fitted. | Exhaust pipe and hot spot. ---|---|--- 500 | 10.7 | 10.1 750 | 16.25 | 15.6 1000 | 22.0 | 21.4 1250 | 27.6 | 26.0 1500 | 33.1 | 30.7 1750 | 38.6 | 35.3 2000 | 43.75 | 40.4 2250 | 48.75 | 45.0 2500 | 53.1 | 50.0 2750 | 56.1 | 3000 | 57.5 | | ||
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).