Wallis’s designs were ahead of their time and the variable geometry craft may well be the way in which variable ranges of speeds and subsequent efficient flight over this range - will be developed. It should be remembered that Wallis was working some 60 or more years ago on these ideas !
In Barnes Wallis’s words; “And so five of my team and I flew out to Langley Field but unfortunately we overdid it. We convinced the Americans too sincerely that this was a great idea and so they decided to take it up for themselves instead of paying us a grant to do it in England".