Cc raptor01, other than just to tell a story the point I was making was that
a) A drop tank of avg impacting the ground and having the conditions to ignite was the exception not the rule.
b) Even trying to ignite spilled fuel with tracers is an iffy proposition.
Weight is a factor in terminal velocity. Object in motion tends to stay in motion and all that. The more mass the object has, the more force is required to stop it. The full drop tank would require more force to counter its accleration than the empty one...but since the resistive force (drag) is the same for both, the heavier tank has a higher terminal velocity. Go look up the equation for it.