I used to do alot of RC formation flying. We had .40 sized bipes. We used the Uravitch Se5 and Fokker DVII 's. We spent ALOT of time getting used to flying close together.
The lead ship must fly a STEADY course. The wingman "flys" the leader's wing. That is to say the wingman concentrates on keeping station. We found that bipes with a light wing loading permitted a slower flight speed. This translated to less control input in keeping station.
We started with 2 planes and when we had that looking acceptable we increased the size by one plane. We had it to a point where we regularly had a 4 plane flight in stepped up echelon formation. It looked great. I found that learning to control a plane at low speed and in tight quarters improved my piloting my abilities. We used this formation flying in a World War One show that we put on at local contests and fly ins. It always was a big crowd pleaser. Our record was 6 planes in 2 vic's of 3 each.
Well that's it. Happy landings, Tony