One more thing, who says a troop ship under escort wouldn't attack if there are WPs on a planet? I've just witnessed my escorting DNs running to the corner while my troop ship made a suicidal charge at a planet with a heavy WP and 20 fighters!! That damned stupid move trashed 5 turns worth of my EMPIRE'S GROSS production!
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A propeller is just a big fan in front of the plane designed to keep the pilot cool. Want prove? Stop the prop and watch the pilot break out in a heavy sweat!