Jerry wrote,

Bob,  the large exhaust opening is being eliminated.  However,   it is
possible to inspect the cool tube, even to pressurize it  to check for
leaks, if one wanted to do so.   The cabin heat thing was always an
afterthought. I like the idea but no one needs to follow my lead.  I
will put a temp probe on the cool tube to see how hot it gets.   If it
stays below 1600º it will NEVER burn out.     Jerry

Mark wrote,
Burn, maybe not, but crack and fail...the jury is still out. You need to get
some hours on this. Preferably on the ground

I have seen enough of GE, P&W and RR's turbine hardware to know what severe
thermal cycles and sonic vibration can do to metal hardware. Please do not
connect this to your cabin.

Mark Wathall

 
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