Bakusson: Is it even possible to avoid SAM missiles in Falcon 3.0? Avoiding air-to-air ones is simple enough: increase speed, fly perpendicular to them, use countermeasures. However, once a SAM is in the air, nothing short of a mountain seems to stop it. They seem to be impervious to countermeasures, and have a ridiculous turn rate that makes it impossible to avoid them by flying maneuvers. A mad dive with afterburners seems to work sometimes, but needs much altitude.
Is there a reliable-ish way of avoiding SAMs?
My apologies for responding to your post a year after the fact but better late than never right? :D
I sympathize over Falcon 3.0 and your frustrations with SAMS. They are indeed a pain. Now to answer your question. If we're talking about radar sams the trick to avoiding them (in my experience) is fly at right angles to the missle, so that they approach you either directly from the left and/or right, turn on your ECM and drop some chaff (del key) until the alert turns off. If you're in campaign mode and your mission takes you into the vicinity of these sites then by all means add an extra flight to your mission to fly CAS with anti-radiation missiles (AGM 88 and 45s).
Now, if we're talking about the IR SAMS that lock on to you when somewhat close to the ground, these missiles are indeed insidious! The truth is that these missiles are modeled poorly in the game and are completely OP.
The only real solution to avoid them, besides sheer luck, is to get yourselves F3MSL, it's a small app that patches the game so that those shoulder mounted missiles are more realistic. With the patch turned on you'll be able to outrun most of these missiles and even if they do hit they won't be as devastating as their vanilla counterparts.
The included text file with the patch explains in further detail.
You can get F3MSL here
http://www.gamers.org/pub/archives/cactus/falcon3/programs/ just download the F3MSL.zip file, extract the exe to your falcon directory, run it (preferably in dosbox) and go through the steps of patching the game.
Hope this helps! Happy flying :)