[PhantomIIF4]

What's the trick to getting bombs to release for the Blenheim? I've tried the methods taught for the He-111, and it seems the Blenheim doesn't have an automatic sight like the Heinkel does. I've tried setting my altitude and speed and stuff with the bombsight keys, but I can't seem to figure out how to get the bay doors to open to release the weapons.

Anyone have some tips?