A while ago somebody said your partners would not see your stealth ships without their own detectors, well that is only PARTIALLY true.
Say I have a stealth ship somewhere in space, for my partner to see that ship there MUST be a detector (hyper optics or others) in the system, and that detector could belong to MYSELF! Funny way to do things huh?
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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!