what is AB, SC,..,..

[Whacker]

Make sure your delay is set to 0. Bombs will explode normally on impact.

Given your comment here and in another thread, it seems that you are running a modded version or versions of IL2. Nothing wrong with that, a lot of us here run mods as well. The problem is, this is NOT the right forum to be asking for help with modded games. There's a Mod subforum here where you could ask questions, but the best place would be at the site where each mod is released from, like the SAS site, or HSFX forum, etc. In short, if you are running anything other than stock, unmodded IL2 4.11.1, you shouldn't be asking questions in here. Hope this helps.