You really don't need them on an airplane with as light a wing loading as the RV-4 has. The real one is the same deal. But the guys who build the full scale ones like the flaps because it gives the plane an amazing range of performance. It's truly a STOL plane that can do 200 mph!

But the model doesn't need to land in 15 feet and it certainly can't do 200 mph so you decide