At Pinecastle, a pit were dug in the ramp for the X-one to become raised in to the bomber, but it had been poorly designed. Between December 1963 and January 1964, Yeager accomplished 5 flights from the NASA M2-F1 https://albieinot180189.bloginwi.com/63673481/not-known-details-about-chuck-yeager-s-plane-in-silver-coin