That is correct. I was an engineer working on the Boeing-Vertol A-X competitor. While it had cross shafting connecting the two rotors it was not a tilt-wing. If one engine failed, without cross-shafting there wouldn't be a vertical tail big enough (pardon the hyperbole) to keep the aircraft stable. We had blown flaps that could be used to tighten turns in addition to aiding STOL. My assignment, had the A-X become the A-9 or A-10, was to refine the blown flap in the Boeing Seattle transonic wind tunnelPaulMM (Overscan) said:
I'll keep an eye out for the images I was able to retain.