Wolf37: This is a somewhat contraversial issue, both here and with brand-W. Friendly collisions are turned off, as I understand it, for two reasons. First, all aircraft start at the same place on the runway. I friendly collisions were enabled, people would be dying left and right as soon as they hit "Fly" and jumped to the runway. I'm sure you've noticed being "inside" another A/C sometimes when jumping to the runway. Still it should be possible to disable collisions on the ground, but not in the air, but...
The second reason for friendly collisions being turned off is because of net lag while flying formation. Try flying tight formations in Forts and watch how the other planes around you bounce all over the place. This is due to net-lag, mostly. Until connections become more stable than is possible with today's comm technology, friendly collisions will probably remain off.
I for one would like to try it with ground collisions off and airborn collisions on, just to see how bad it is.
By the way, HtC: love the collision model otherwise. I've actually survived collisions with enemy aircraft, sometimes with catastrophic damage forcing me to bail immediately; othertimes with a heavily damaged but still [barely] controllable aircraft. Much better than brand-W. Thanks.
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Rojo (S-2, The Buccaneers)