Ted, you mean taking the time to do a search first or reading a sticky like the prop chart? You jest!! That would take some time and effort. I asked about the rust because I had a friend here in Vegas that had to move to Texas to a very humid area. He sent me a couple of almost new four strokes he was having problems with. When I opened them they were balls of rust in just one year. The man was really careful with his engines so I was a bit in shock at how fast the rust happened. Even after run oil didn't save these engines.
I still have my big engines from my control line and free flight days, McCoy and Veco 19s. Throbbing power!! I still use my TD .049s once in a while. These of course always get run dry unless they get landed early.