I know it's getting away from the point of the thread, but I felt obliged to stand up for the dear old F3 in that I once carried out a Skyflash firing from FL500 and M0.9. It worked, too. I can't remember the trial name, but it was a high seas affair, off the Shetlands. The target was a rocket fired from a Canberra. I guess we could have diverted to NI, so maybe it was on thread?