RE: pros and cons of 2 and 4 stroke engines ?
Dave ... both will overheat if there is insufficient cooling or if over leaned. For a Spacewalker go for a 4C, it sounds very cool! Its nice to hear it with a 4C puttering around. You can go with a 2C but you will need a Pitts muffler if not the stock muffler will make the plane look bad. Go with a 4C throwing a nice 15x6 prop. Read the reviews and see what they use and how it flies.