
Originally Posted by
PhantomTweak
The J-79 has what's called "laminar airflow" built in. It maintains a layer of outside air, or "cold air", off the 5th stage of the compressor, I think, don't quote me on that. Anyway, this layer of air is blown down through the engine to keep the hot air, from the burner can section back, from touching the metal of the engine. Essentially, you have the "tube" of hot air from the burner cans, travelling through the engine from front to back, through the turbine section, and on out through the AB section, and out the tailpipe. Then, there is a "hollow tube" of relatively cold air surrounding the hot air "tube", keeping the metal of the engine cool. It's just thicker than a human's fingers. You can curl your fingers around the end of the tailpipe, keeping them flat on the metal of the turkey feathers, in the "cold air" layer, while the engine's exhaust, even in AB, blasts over past them.
Scary feeling, but a real thrill. When you're a young Marine. I would have trouble doing it now.
I have heard of ONE guy lost a finger, didn't keep it flat down on the way out, apparently. No blood, at least...
It's just a neato trick, is all. Fun as heck.
Have fun!
Pat☺
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