G2 unable to do a flat spin
I have been able to do normal spins with the Pitts, Extra 330S and Edge 540 that come with Add-ons vol. 4, but those are the only airplanes I have come across so far. Not any flat spins though. Just normal ones.
The Pitts seems to be the easier to spin of the above. No magic needed. You just enter it as any normal spin.
The others seem a little more sensitive to how you treat them at the entry. The Edge 540 in particular does not seem to like too much rudder (as in full rudder) just before it is about to stall. Instead of entering a spin, it then enters some sort of turning side slip. I have not experimented very much with it, but it seems to enter spins more consistently if you go easy on the rudder at the last moment.
Krister