BGC-22 British Mechanic and Oil Cart
A well known feature of Rotary engines was its use of castor oil. With the fuel and oil mixed together in the crankcase it was important that the fuel not dissolve the oil and ruin its lubricating qualities. The perfect choice was pharmaceutical-quality castor oil—it would stand the heat and centrifugal force, and its gum-forming tendency were irrelevant in a total-loss lubrication system.
An unfortunate side effect was that pilots inhaled and swallowed a considerable amount of the oil during flight, leading to persistent diarrhea. This also accounts for the pilot?s use of a flowing white scarf—not for a dashing image, but to wipe goggles clear of the persistent oil mist flowing past the cockpit.