I’m pretty sure that it is completely illegal to have any “real” pyrotechnics or projectiles on an RC plane. I think they were “faking” the bomb runs by remote detonating ground mounted explosives. I could be wrong, but those were the rules the last time I flew RC.
You are correct. Those rules are still in force.
R/C flier since 1985, R/C flight instructor since 1987.
Currently flying a 1/4 scale Fokker Dr-1 and a 1/5 scale
P-51. Currently building a 1/3 scale Sopwith Pup, with
plans for a 1/4 scale Fokker D-VII for next year.
Mike