forgive me if this is a stupid question But looking at the picture below..
Photo © Bruce Leibowitz
.. and looking specificly to engines #3 and #4 it seems they are bleedless right? But I seem to remember that on the 707 only the #1 engine was bleedless, like in this picture;
Photo © Ondrej Smrtka
Photo © Jason McDowell
So what's up here? Does the KC-135 have different engines? And if so, where does the bleedair for the airco and other things come from?
Thanks in advance!