I maybe missing the point here but for two aircraft to get within 200yards and then 50 yards of each other I take it that you must have been happy to do so BFG. Where do your responsibilities for look out begin and end??
I would have thought if you took off and came straight head on with these 5 aircraft you would have been better placed to see them than them to see you. You would be looking up with a sky backdrop, they would have been looking down with a much more difficult task to pick you out from whatever surrounds your strip.
Lookout is everybody's responsibility, no matter where they are or what they are doing. For you to have come within 50 yards of another aircraft your lookout must not have been up to scratch yesterday either.
Every aircraft has blind spots, you need to be aware of where they are on your kite and adjust your scan pattern accordingly.
Be careful out there folks
T