As one of the few people on this board that actually measures things (on occasion) I have to ask ... why? Yes pressure drops during ammo movement but that is easily minimized to the point of no measurable affect with a large chamber. Heck even with CB of 2 the energy lost compared to a continuously injecting more fuel during the firing is trivially small. And, for spuds, probably lost in the normal shot to shot variation in performance.DYI wrote:One can only increase chamber pressure up to the point where the projectile is destroyed, at which point it is worthwhile to strive for a flatter base pressure profile. As I mentioned above, even in the case of the combustion with a huge chamber and a very fast burn, base pressure will still decrease as the round moves farther from the breech. Rapid fuel/oxidizer injection during the acceleration process may be able to counter that problem to some extent.
Why make something as complex as a continuous injection system when you can just make the chamber a bit bigger? Or the barrel a bit longer? Is it really worth all that effort just to increase the muzzle velocity by a bit?