Is there a minimum altitude to drop your bombs so that they can arm or something? A lot of times when I'm flying a fighter-bomber loaded with bombs and I come swooping in and drop my load on a tank at 300 feet or so, the bombs will just disappear into the turf. It's like what happens when you drop your bombs while still on the runway, they just disappear, no explosion, nothing.
I'm a little bothered by this because I usually drop my bombs from my fb when the feet is measured in hundreds. And if I'm going to all the trouble to lug the bombs over there and then when I dive on my target and release my bombs, and then nothing happens, it's a little annoying to say the least. It works fine flying a level bomber or dropping from high altitude though.