Putilov 76.2mm anti-aircraft gun M. 1902

Bulgarian designation :		специално 76.2-мм руско противоаеропланно оръдие
German designation :		7,62 cm Ortfeste Flak L/30 (russ. 02) 7,62 cm Sockelflak L/30 (russ. 02)
Calibre :		76.2mm L/30
Weight of the barrel :		389 kg
Weight in action :		3420 kg (Ortfeste Flak)
		1350 kg (Sockelflak)
Weight in marching order :		2440 kg (Sockelflak)
Barrel length :		2.286 m
Barrel grooves	number :	24
	depth :	0.76 mm
	width :	7.19 mm
Cartridge	size :	76.2 x 385 x 90 R
	weight :	9.35 kg / 9.23 kg
	charge :	950 g / 700 g / 475 g
7,62cm Gr.G.C. 36 :		6.85 kg – charge : 190 g
7,62cm Gr.G.C. 43 :		6.85 kg – charge : 350 g
7,62cm Brand-Gr. 1915 :		6.85 kg – charge : ammonium nitrate, magnesium, resin
7,62cm Brand-Schr. Krupp :		6.85 kg 42 incendiary balls and 84 filling parts
Muzzle velocity :		588 m/s
Max. range :	horizontal :	9400 m (8000 m with time fuze)
	vertical :	5600 m
Ammunition for barrage fire
Cartridge :	size :	76.2 x 385 x 90 R
	weight :	9.23 kg
	charge :	590 g
Muzzle velocity :		410 m/s
Max. range :	horizontal :	7400 m (6800 m with time fuze)
	vertical :	4050 m
Elevation :		+ 70° / - 3° (Ortfeste Flak)
		+ 70° / 0 (Sockelflak)
Azimuth :		360°
Remarks : Russian Field gun transformed into Bak by German Army. During the war the Bulgarian Army received some Rheinmetall Ortfeste Flak and at least two Krupp Sockelflak. Both these guns were mounted on pedestal, but on the base of the Sockelflak could be mounted two wheels, in order to facilitate the movements. At first these guns used the captured Russian ammunition, then they adopted Rheinmetall made shells (at first the 7,62cm Granate G.C. 36 and later the 7,62cm Granate G.C. 43, expressly designed for a/a fire). They used also a Rheinmetall incendiary shell (7,62cm Brandgranate 1915), replaced later by a more sophisticated incendiary shrapnel (7,62cm Brandschrapnell Krupp).

7.62cm Sockelflak L/30 (russ. 02)

7.62cm Ortsfeste Flak L/30 (russ. 02)