When told to RTB they almost always will RTB at the last NORMFLY waypoint's altitude before the LANDING waypoint so if it set really low they will terrain hug until they almost invariably hit something. I wish there was a way to specify that RTB altitude but until that happens I set a fairly high waypoint altitude for that last waypoint. The absolute minimum I use for that last NORMFLY waypoint is 1000 meters. So at least one aircraft will land on the first pass I set it roughly at a ten to one distance from the landing waypoint.
1000 meters NORMFLY altitude, set 10 kilometers (10000 meters) away from LANDING waypoint
5000 meters NORMFLY altitude, set 50 kilometers (50000 meters) away from LANDING waypoint
7500 meters NORMFLY altitude, set 75 kilometers (75000 meters) away from LANDING waypoint
It can take some fiddling by aircraft but that is a fairly decent starting point.
Wheels
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