27 February 2005, 09:49 PM
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#40 (permalink)
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Forum Ace
Join Date: Feb 2005
Location: Auburn, Washington
Posts: 559
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castor oil
I am at a bit of a disadvantage here because I haven't seen these "over-weathered" models, at least not all of them.However, having flown R/C models for over 25 years, I have at least a little knowledge about castor oil.
My very first "gas" powered model was powered by a "leaky" Taiwanese engine with home brewed fuel mixed by my father, a long time modeler, and contained about 20% castor oil. Let me tell you, that model was just about impossible to keep clean. Rubber bands turned into slimy snakes, covering seams were penetrated, and even with window cleaner or other detergents, you could never completely get rid of that "sticky" feeling. This was a model covered with plastic film and sealed with epoxy in the engine compartment.That is the good and the bad of castor oil. It is a superb protectectant and lubricant, but like a bad house-guest, never seems to go away.These days I don' t know of any RC airplane fliers who use all castor lubricant(some use a synthetic/castor mix) and no RC helicopter pilots who use it. They would rather have their engine bearings rust than have to clean up semi-burnt castor oil gunk.
Now, imagine that gunk being spewed out of a leaky rotary engine onto a fuselage of doped fabric. A plane that might have flown 2-5 times a day, into combat. IMHO, if it has a rotary engine and has flown, it needs at least a little evidence of that.
PS: Inline engines are another story
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