Explosion smoke plume duration

[dave4002000]

I apologize if this has been asked before but i couldn't find anything about it.

 

Here's the situation. I currently activate a B-52 in mid-air and then explode it immediately within the same trigger. I'm doing this to create a visible crash site for a CSAR operation so the players can find the general location before i activate the stranded crew on the ground who then pops smoke for extraction.

 

My issue is that the black smoke plume seems to disappear faster than say, a tank i blew up with a mav. Are there any tricks i can use to get that black smoke to stick around longer?

 

While i was typing this, i just thought about using a timer to trigger some small secondary explosions once the B-52 hits the ground. If i make the explosions barely visible (say a value of 1 or 2), will i still get the same size smoke plumes?