ALL
Am still curious as to the actual efficacy of those six "tubes" and wondering if they collectively had the air delivery capacity of an "honest" classic bypass duct (eg. F-100/101/110/RM-8/M-53, F-414, et.al.), and, why, even if they somehow did, the concept was not precluded by energy loss intrinsic to the no less than FOUR(!!) right-angle turns,(i.e. out of the compressor after the fourth stage, and, by definition, essentially perpindicular to the longitudinal axis, then back parallel to the axis to head aft past the high pressure stages, combustor and turbines, back in, at the AB, and perpindicular again, with a final turn to match the prevailing gas flow), and the issue resolved with a "simple" radial extension of the low pressure stages, ala Snecma M-53?
Not to "Monday morning quarterback", but, given the sheer aerodynamic elegance of the Blackbird, the tubes seem appalingly crude.