View from
directly aft of X-15 on the
pylon
of its B-52 carrier aircraft is a NASA photo. This copy was
retrieved
from Files/pics/pic04.jpg on the CDROM published by Apogee Books and
included with X-15 - The NASA Mission Reports. This photo shows
the 1959/1960 interim configuration using a pair of XLR-11 rocket
engines, each with four chambers, instead of the single XLR-99 rocket
engine.