I mentioned both radar and heat. If MANPADS are heat seekers, okay. Some versions of stealh try to lower their heat signatures, e.g., hide the jet engine outp

I mentioned both radar and heat. If MANPADS are heat seekers, okay. Some versions of stealh try to lower their heat signatures, e.g., hide the jet engine output from the ground by an extension of the part of the plane below the engine and mixing the jet exhaust with cool air. For the F-117, can get a little view of its engine output at http://aviation-design.fr/images/jets/rc-jet-model-f-117/large/f117-in-flight-aviation-design.jpg http://aviation-design.fr/images/jets/rc-jet-model-f-117/lar... Looks like they tried to hide the exhaust heat.