MB-4 never built. The sabre-engined MB-3 was to have had a merlin, but Martin, as ever, couldn't make a simple substitution, and after the MB-3 crashed, he redesigned it to become the MB-5.
The jet delta was not the MB-6. See attached pictures. The MB-6 was one of his late war designs, see "Sir James Martin the authorized biography of the Martin-Baker ejection seat pioneer" by Sarah Sharman, edited by Patrick Stephens Limited. My copy still packed. I'm getting tired of having to say this!
The jet delta was not the MB-6. See attached pictures. The MB-6 was one of his late war designs, see "Sir James Martin the authorized biography of the Martin-Baker ejection seat pioneer" by Sarah Sharman, edited by Patrick Stephens Limited. My copy still packed. I'm getting tired of having to say this!