Cookie wrote:Correct me if i'm wrong but didn't WW1 fighters run something like Castrol?
frankdamp wrote:Yes, they did, Cookie. The old rotary engines ... used castor oil in a total loss system.
I googled 'Castrol R' and came across the following in an archive of "Flight" magazine dated December 14, 1922. I found it interesting and so thought others might, too. I also really like the way they wrote back then.
"It is safe to say that with the history of British aviation no individual product has been so closely associated as Wakefield Castrol " R." For that world-famous aero-engine lubricant has played its own important part since the beginning of flying on practically every type of aeroplane, seaplane, flying boat and airship. Working as it often must under greatly varying pressures and temperatures the aero-engine oil has to withstand the severest tests. Indeed, the whole problem of efficient lubrication is one of a highly complicated and technical nature. In this connection Wakefields were able to draw upon their great experience already gained on high-powered racing motor-cars and motor-boats. So that with the data they had gathered they were able to set their research department, with its well-equipped laboratories, to a task which was not so much a new problem as a development; and, of course, the firm enjoyed the active co-operation of engine builders in the form of practical experiments and tests—on the bench and in the air. The outcome of this pioneer work was the production of Castrol " R," the fame of which has extended throughout the entire world of flying The feature of this lubricant is that it is an absolute blend (not merely a mixture of ingredients), the constituents of which do not separate however long they are allowed to stand. Possessing all the lubricating properties of castor oil, and reducing to the minimum the tendency to carbonisation, which is present in all vegetable oils, Castrol " R " has a higher " flash point " and a remarkably low " freezing point." The latter feature is, of course, of vital importance. Castor oil becomes too thick to lubricate at zero Fahrenheit, but Castrol " R " retains its fluidity at a temperature of -26 degrees F., or 58 degrees of frost. This means that the engine continues to be lubricated at any altitude or in any temperature at which flying is practicable—at the time of writing, anyhow!"
Hope this isn't too much off-topic for this thread.