An interesting mini update on the old ‘Whole Nine Yards’ chestnut, from this post on firearms site ‘Forgotten Weapons’. The question of the possible machine gun origin for the phrase is raised in the embedded video, and then, in the comments, we find this:
“The 350-round belt of 0.50in used in the inboard guns on each side of the M2 .50 gun system of the P-51 Mustang and P-47 Thunderbolt (four guns on the six-gun P-51, six guns on the 8-gun P-47), was exactly 27 feet, or 9 yards, in length when fully assembled.
The 240-round belt used on the outboard guns on each side was 18 feet 6 inches long altogether. But “the whole six and a half yards” doesn’t sound nearly as emphatic.
To figure it for yourself, treat each round of ammunition in its link as being .915 inch in width. A calculator helps.”
I had previously said that no such machine gun belt existed, and therefore this origin, despite being the most commonly accepted one, was nonsense. I’m still sort of right on the first point, and entirely right on the second (unfortunately – I’d love this one to be true!).
The first problem is that by this chap’s own calculations, this particular ammunition belt is just shy of nine yards – 8.89583 yards to be precise. This might sound like nitpicking, and frankly, it is. If this really were the origin of the phrase, I doubt anyone would care if it was slightly shorter or longer than the exact nine yards, and linked ammunition being flexible, there would be a fair amount of ‘slack’ that could vary the precise length quite considerably (which is I suspect why this myth refuses to die – you can’t actually disprove it by measurement alone, and most people don’t have a spare full belt of .50 BMG lying around…). But hey, I ran the numbers as he suggested, and it isn’t quite ‘the whole nine yards’ to start with.
There’s a bigger logical problem with the claim, one that has always dogged it in fact. That is, all of the aircraft claimed were fitted with more than one belt of ammunition, and it wasn’t possible to fire only one gun at a time. So you could never ‘give him the whole nine yards’ unless you experienced a malfunction of all of your other guns. Sure, the phrase could have stuck despite this, but it just doesn’t ring true.
Much more importantly than either of these minor gripes is that we already know that the phrase pre-dates the existence of aircraft machine guns by several years. The first machine gun was fired from an aircraft in 1912, whereas the first known incarnation of our phrase (in the form ‘full nine yards’) dates back to 1907.
So I’m afraid that, as much as I like the idea, this nine yard long machine gun belt is just a coincidence. It’s possible that Second World War air and ground-crew might have used it to refer to these belts, but there’s no actual written evidence for this, and above all, it cannot be the actual origin of the phrase.
As far as I’m concerned, we have a provisional origin for this phrase, and it’s baseball. If we’re to confirm or refine this conclusion further, we need to look back in time from 1907, not forward.