Stuka's not screaming?

[lancerr]

After doing quite a few missions with the Heinkel, I switched to the Stuka to practice but found that when I enabled dive brakes, I did not hear the characteristic scream that I would expect.

Anyone else getting this?

Also - on a side note, the default detonators for Stuka's has a delay of 8 weeks? Clearly some kind of typo, but I do notice that the bombs I drop don't explode for a while. How can I change to explode on impact?