X-15 flights were short ... caused the two thrusters on the left side of the nose to fire. Eric Long/NASM The 60,000-pound thrust XLR99 rocket engine was the first large rocket motor reliable ...

The X-15 is now of great interest to the public and ... Page 91, Scene 208: Two planes flying upside down and side by side during a test operation is rather far fetched and not considered practical.