Jaques d'Alltrades writes:

The message
from "Ned" contains these words:

But seriously, apart from being the source of ricine (after processing) the
plant is also the source of castor oil.

Which has the most delightful bouquet when used as a lubricant in an
infernal combusting injun...

Aircrew in the first global unpleasantness certainly stayed
regular. The rotary engines got through quite a bit of castor oil each
flight...

Anthony