another thread (Ishmael's about realism) mentioned HO collisions and their effect on game-play.
But are collisions realistic.
I have never read a report of an accidental collision with an enemy aircraft.
Sure there a re a few accounts of 'heroic' deliberate collisions - usually when the pilot or aircraft has been in a hopeless or dying position. And some accounts of Japanese aircraft using a ramming technique in Homeland defence late in the war.
There are however, many, many reports of "friendly' collisions.
Yet in WarBirds they are modelled in reverse - you can collide with the enemy but not friends. Of course formation flying would not be possible in buffs if friendly collisions were enabled.
But wouldn't it be better to exclude enemy collisions on the basis that any rational pilot who has at least some aircraft control would avoid colliding? You can get awfully close, awfully quick, and still avoid hitting something - as my frequent near misses of pelicans and eagles has showed me. Ok, birds dont have double closing speed, but in fast-closing aircraft there are two rational pilots though.
Maybe only allow collision to happen if aircraft contol had been lost by spinning/stalling or loss of control surfaces.
some food for thought/discussion
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burbank
WWII history and Multi-player Simulator books
http://www.senet.com.au/~mhyde/burbanks_books.htm