For anyone interested (Cam?) in how the Iroquois performed up to M2.3 66000ft its most intimate details are laid bare, eg lack of surge margin and possible fixes.

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090026499_2009026332.pdf

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090026526_2009026767.pdf