This whole experiment shouldn't be based on one person's assumptions alone.
I think my irony-meter exploded when Killburg wrote this.
Kurztown, R. Mackey (who really is a saint), went to considerable trouble to give you a detailed and explicit calculation that suggested a plausible and possible mechanism whereby the initial fireball from the crash of Flight 93 would have been more than large enough to generate the mushroom cloud observed in the McClatchey photograph.
Your response to this was to say "nuh-uhhhh." For you, the only "first principle" that matters is "does it fit my own personal, uninformed best guess."
Tell us, do you apply this principle to all the findings of science, regardless of how surprising they seem to an uniformed layperson? Do you refute the findings of quantum science (nobody's "gut feelings" about the behaviour of sub atomic particles have ever been borne out in experiment)? Do you dispute plate tectonics (does anything seem more counter-intuitive than the fact that the very land beneath our feet is in a state of permanent drift)? Do you dispute Einstein's E=MC squared (there's no "informed guess" that would lead us to think that mass can be converted to energy)?
Or is it only in the field of plane crashes that you think that science has nothing to tell us, and that your "gut feelings" should be held to be the final and unchallengeable standard by which all other evidence should be measured?
If you have anything other to offer to this discussion than "I don't think it could be that large" (which is, I should stress, the sole basis for the claims you have advanced) now would be a good time. So far you have done nothing but cement everybody's opinion that you
A) made a public accusation against someone on the basis of no evidence whatsoever
B) are manifestly (and confessedly) incompetent to even follow (let alone perform independently) the mathematical arguments that would be necessary to make any kind of informed estimate of the plausible size of the cloud formed by the crash of Flight 93.
and
C) are too cowardly to confess your error and apologize.
One day you will think back on this "argument" (it's hard to see it as a real argument given that you have advanced not a single reason to support your claim) and burn with shame. Not shame at having demonstrated such profound ignorance (there's nothing shameful about ignorance--only in refusing to amend it), not shame in having so comprehensively failed to support your argument (losing arguments is the way we learn), but deep and lasting shame at having made such a public and scurrilous accusation against an innocent person on the basis of nothing more than a passing whim, and for the cheap reward of getting applause from uncritical Conspiracy nuts. The only way you can mitigate some of that future shame is by making a very public and very clear apology to Val McClatchey.