In an earlier life as an instrumentation techician for the US Gov't, I measured and recorded the behavior of internal ballistics energy on the outside of the barrel of the GAU-7 (caseless ammo, 25 mm gatling gun). It was abandoned due to the mechanical synchronization problem between feeder, loader and rotating chambers at high speeds.
Philco-Ford was competing against GE. In the ammo dept it was Hercules against Brunswick (I think). GE and Philco, I believe were also competing feeders. Each contractor supplied a gatling and a single shot breech loader (for ammo testing). GE's item had six barrels as I recall and Philco was five-barreled. I don't believe the GAU-7 was targeted for the F-15, but I could be wrong. I thought it was an A-10 project. The A-10 was a new project then too.PUT THE FIRE OUT? ARE YOU CRAZY? We ran like fugitives! Pretty much ruined the firing bay it was in, but as I recall, the test item (gun) was unharmed. 'Don't remember which one it was (GE vs Philco).
ikke666 said:i didn't kwew there were 2 different GAU-7 models. very interesting
PaulMM said:Nice, Abe, but someone already posted most of those
Lauge said:Six barrels and ten chambers? How the Niflheim was that supposed to work ???
Colonial-Marine said:Is there any more information about the ammunition itself out there? I recall reading that the cartridges were wrapped in some sort of flame-resistant packaging which had to be stripped before firing. Factoring in everything else, the entire setup must have been very complicated and heavy.
Tony Williams said:Colonial-Marine said:Is there any more information about the ammunition itself out there? I recall reading that the cartridges were wrapped in some sort of flame-resistant packaging which had to be stripped before firing. Factoring in everything else, the entire setup must have been very complicated and heavy.
I have one of the cartridges in my collection; it's basically a cardboard cylinder with the projectile buried inside.
One of the problems with combustible case ammo is that if the magazine gets hit by an enemy shell, the whole lot goes up in fire/explosion. So each round had to be wrapped in a fireproof sleeve which had to be stripped off the round before loading. Far too much trouble...
Blacktail said:CTA (Cased Telescoped Ammunition) technology predates the F-15 and GAU-7 by almost two decades, but it never worked.
As it happens, that issue was what doomed the famous H&K G11 Assault Rifle of the same general era as the GAU-7, back when CTA was all the rage.
And guess what the US military is doing now, to try a totally-new approach to ammunition technology? More CTA ammunition!;