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Hey! Next time, try this on the flour bomb contest:
  • First you need to know how long it takes for the bomb to hit the ground

    • where h= height and g = gravity (32)
  • Next, you need to know the distance you will be traveling in the time it takes for the flour bomb to hit the ground.

    • d = v t  where v = velocity (fps).
Sound simple? Let's try a sample:
Let's say you're going 80 mph (117 fps) and you're 200 feet agl.
First, let's calculate the time:

Now, let's calculate the distance:
d = v t  = 117 fps (3.5) = 409.5 feet

If you have a calculator handy:
inv tan = d/h = 409.5/200 = 63.4 degrees
Now, draw a 63-1/2 degree angle on a piece of paper and tape it on window for a bomb site and you're ready to go!
 

So, if you drop the flour bomb 409.5 feet before you get to the target you'll hit the mark ( or be beside it if you're not lined up correctly and, you're going exactly 80mph and 200ft agl).