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 Goshawk engine's cooling system, detailing issues with air bubbles and water loss upon boiling.
| Identifier | Morton\M2.1\ img039 | |
| Date | 11th August 1931 | |
| contd:- -2- position. We are sending these sections on to W.W. It will be noticed on the sections that there is a fin formed inside the cylinder head. This has been entirely overcome in the later castings. We are running the a Goshawk engine on the Test Bench as suggested by R.{Sir Henry Royce} We have run it with glass pipes in the circuit. We find that in filling up the Goshawk with water there is a certain amount of air trapped in the cylinder head but this is forced out immediately the engine is started up and the pump circulates. After the water reaches 80° a considerable number of bubbles can be seen circulating with the water at the same time the volume expands so that before we reach actual boiling point, we lose 2 qts. of water due to the steam bubbles taking up the space. As soon as we boil, another quart of water is forced out, but after that water has been got rid of, only steam comes away from the radiator. The Goshawk we are running on the Test Bed is really better than the 40/50 for not throwing out water with the steam when it is boiling. The total capacity of the system on the Goshawk is 4 gallons. The top tank of the radiator contains 3 1/2 qts., this means that as soon as the Goshawk boils, we lose all the water in the top tank. The tests are still in progress. Hs.{Lord Ernest Hives - Chair} | ||