У vaduhan_08 где то было про это дело с кажется этим или подобным рисунком :
Тогда я сказал своё категорическое "Нет !!! Не могут быть такого !!! Давления не хватит, крепежа не может быть тогда такого, уплотнителей, чем качать давление и т.д."
А если все это происходит в 1014-1918 года при повальном дефиците пороха, пушек и т.д. ?
Смотрим туды :
French pneumatic mortar WW1. Instead of using explosive propellants to launch the mortar round, compressed gas heaved the shell skyward. A series of mortars, ranging from 60mm to 120mm were put into service during the stalemate trench warfare that marked the First World War, were designed by Edgar Brandt.
Austrian 20cm pneumatic mortar: 1916
Boileau-Debladis 86mm pneumatic mortar
This is the Boileau-Debladis mortar allegedly in use, but it is probably a posed photograph, judging by the clean uniforms of the soldiers. The man on the right is holding one of the finned projectiles. The range has been quoted as an unimpressive 273 metres. The projectile weighed 1.53 kg, of which 0.45 kg was explosive.
Like the Brandt 60mm mortar, this has a closely-attached air reservoir, in tis case the cylinder mounted under the barrel. Details are currently in short supply, but the item sticking out from the bottom of the barrel is almost certainly the valve that puts the reservoir in communication with the barrel.
From the New York Times 17 Feb 1918. The weapons was actually introduced in 1916, so this is not exactly hot news.
Austrian 8cm pneumatic mortar: 1915
The 8 cm Luftminenwerfer M 15 (Pneumatic trench mortar) was a light mortar used by Austria-Hungary in World War I. Remarkably it was not designed by an arms manufacturer but by personnel of the 58th Infantry Division; the first twenty examples were built in the division's workshops. Production was later contracted out to Vereinigte Elektrische Maschinen AG (United Electrical Machinery AG) in Budapest. The method of operation is usually described thus:
"It used the breakable screw method to retain the bomb in place until the air pressure in the chamber was strong enough to break the screw. Grooves of different depths could be used to vary the range. It was sometimes referred to as the Roka-Halasz system."
Thedescription leaves much to be desired. It is not clear if the grooves are in the projectile or the barrel, and unclear how the depth of groove would affect the breaking stress of what was presumably some sort of set-screw that had to be screwed in for each round. This would not make for a rapid rate of fire. Presemably if you ran out of screws you were, well, screwed.
The use of this breaking-screw system seems a bit more logical when you consider that it appears to make a separate air reservoir unnecessary, which would much reduce the total weight of the weapon. In the picture it appears that the compressed-air cylinder is used as a stabilising weight instead.
The 86mm pneumatic mortar does not appear to have a Wikipedia page.
12cm pneumatic mortar: 1916
The long-barrelled pneumatic mortar in the foreground is displayed in the Museum of Military History at Vienna. (Well worth a visit) It was described as the 'Luftminenwerfer M16' ie, Pneumatic mine thrower, Model 1916.
The barrel is 2 metres long and the bore is 12 cm. The compressed air was stored in a cylinder at 35 atmospheres; (514 psi) a full cylinder of compressed air would deliver eleven shots.Two projectiles can be seen on the wooden board in front of the mortar. Circular studs are fitted at the rear end of each round. Assuming this device works in the same way as the 20cm air mortar, they engage in grooves in the breech section that give the shell rotation as it accelerates; the barrel itself is smooth-bore. There is no recoil system, the barrel was rigidly mounted. This may have only been practical because of the relatively gentle acceleration of the projectile by the compressed air.
The 12cm pneumatic mortar required a crew of three.
Austrian 12cm pneumatic mortar: 1915
French soldier with a 86mm Boileau-Debladi pneumatic mortar.
И т.д. и т.п. у многих гейопейских стран были на вооружении ШТАТНЫЕ ЗАВОДСКИЕ пневматические мортиры ... а ведь было еще больше самопалов окопных умельцев ...
Мы видим характеристики этих "пукалок" - 35 атм., 2 м. канал ствола, до 300 м. дальность стрельбы, в районе 1.5 кг. вес снаряда.
Любому ПТУ-шнику понятно что это лажа, не толкнет воздух в 35 атм. груз весом 1.5 кг. на 300 м.
Но я встречал как то упоминание о КАРБИДНОЙ ПУШКЕ. Вот тогда все становится на свои места. Не нужны какие то газовые балоны с воздухом, досточно пережечь мрамор , получить карбид и далее все как на стройке / заводе - снаряд, пшик газовой смеси в камору, электрическая или еще какая искра (может тот же самый фитилек) и снаряд лет уже под действием взрыва :
Ацетилен, С2Н2.Углеводород, без вкуса, без цвета, без запаха. Легко взрывается, при горении в чистом кислороде температура может достичь 3000 градусов.
Гонишь !!!
Легко проверить любыми очумелыми ручками :
Как видим конструкции одинаковы и дальность свободного полета обычной картошки в 100 гр. за 300 метров.
Кроме слабого хлопка ничего не слышно, пламени нет или почти нет.
Заряжайте пневматические мортиры 1 МВ гранатами из консервов и смело пуляйте во врага.
По тому же принципу скорее всего сделали и пневморужья, газ из баллона и ударно-фитильный замок, а далее ружейная граната летит куда надо.