Wooden props only except for the Revmaster engine.What I am finding for information so far is saying the VW heads are good for around 200 flight hrs, does this sound about right?
So if you invest in an extra set of heads when you build the engine, to insure they are all matched, it will likely be many years before you actually need them (25hrs to 50hrs a year is typically a lot). It will be an effort to keep them from corroding in that amount of time. What do you do, keep them submerged in a container of oil?
So only wooden props? Has anyone had any success with other kinds of props, or it is just the way it is?