I’d speculate the calculations were a firing solution for the avgas tanks he was firing at.
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That could well be. But why go to the trouble of making those calculations and then not calculating the “odds” of being able to ignite a conflagration with the ammo he used?
I know plenty of intelligent people who just aren’t as smart as they think they are. I’m sure you do too.
Mental derangement and fat egos are bound to lead to mistakes, right?