ok i have a much simpler solution should you choose to try it. basicly get a physics engine (i use devil physics engine, but thats just me) and make an object that has physics and make it go in the direction that you are facing at the ark you wish. while the game is updating keep a timer for each bomb and when the timer for each bomb reaches a certain number, delete the object and its physics and use whatever explosion effect you want.
basicly: let the physics engine do the work for you
basicly: let the physics engine do the work for you