And when you take it (the business end) out of the D, it looks like this !
Back in Aug 2006, the Seattle Museum of Flight (SMOF) crew
took the RJ-43 out of their D-21.
Jim Goodall (who works in the SMOF facility) sent out a bunch of
photos of this effort. I include a few here, without his permission,
because the mail he sent around didn't forbid anyone from doing
that and since we are all airplane freaks, I don't think he'd mind.
So these photos are courtesy of the Great Jim Goodall.
They portray the rather unusual nature of the ramjet installation
in the D-21 (namely the supersonic diffuser is still attached, but
the cowl is gone). I believe the supersonic diffuser is still attached
as the fuel control is in there. So at this point in the D-21 duct,
the flow is subsonic and so the RJ-43's supersonic diffuser is not
needed, but since the fuel control is in there, it is still needed.
I also worked on the restoration of this D and M. SMOF is a GREAT
Museum and I highly recommend it to everyone !!