Flying 9/14 FSO. A6m3 set on fire by unknown spit V. (30 cal) No sound whatsoever of any hit on my plane. Just all of the sudden my plane on fire. Hit sounds at 100%. In looking at the film it appeared a single tracer round from above set my A6M3 on fire. There sould be some sounds of bullits hitting the plane. Set on fire way too easy. Terrible programming.