jonkil wrote
Solve this by practising giving them a "short back and sides" using a 3 blade composite prop on full bore about 6 or 7 ft above the centerline, but always approach them from the front so you can see the white of their eyes, land, get out and give em a good talking to, asking them why the are they walking on an airfield and point out the signs to that effect. (**TIP** make sure you have the signs up first).
Trouble is (in my experience) they've usually legged it back to their cars and scarpered by the time I turn round and taxi back to them..........
Except the fat cow who stood her ground and argued the toss that her kid had a perfect right to fly his kite on 200ft lines from the middle of the strip, despite red/white signs 2 feet high saying 'Danger, active airstrip, keep off'.
She prevented the a/c from landing for a good 10 minutes despite fly-bys as you advocate..
Cusco