Originally Posted by
Roelof
It will work, many people even use simple medicinal castor oils from the drugstore.
Yeah. Been there. But it is hard to find a medicinal castor oil without additives. Most of them have soothing agents for skin care mixed in, and are not de-gummed or filtered. Last one I used was good performance-wise, but the engine inside was gummed up real bad after sitting for a month or two. The bearings were seized solid with all the gelled castor. It took a lot of methanol and brake cleaner to free it up.
When I was a kid and used to fly control-line airplanes, I would go to the pharmacy and buy a 2-liter bottle of methanol, and brought an empty bottle to get filled with castor oil they sold by volume. Then I would mix them up and go fly. Good times! No such things right now. It is even hard to get pure methanol these days. Not to mention pure nitromethane, which is downright impossible. Those engines never got gummed up, so, it was a different medicinal castor oil.
Going to give your oil a try. Looks good.