Bulgarian designation : | 75-мм нескорострелно планинско оръдие “Круп” | ||
Krupp designation : | 7,5cm Gebirgskanone L/13 | ||
Calibre : | 75mm L/13 | ||
Weight of the barrel : | 102 kg | ||
Weight of the carriage : | 157 kg (original carriage) | ||
244 kg (improved carriage adopted in 1892) | |||
Weight in action : | 259 kg with the original carriage | ||
346 kg with the improved carriage | |||
Barrel length : | 975 mm | ||
Length of the bore : | 845 mm | ||
Length of the rifled part : | 700 mm (9.4 calibres) | ||
Barrel grooves | number : | 24 | |
depth : | 1.25 mm | ||
width : | 7 mm | ||
Length of twist : | 1875 mm (25 calibres) | ||
Height of the line of fire : | 660 mm | ||
Battering charge : | 400 g of black powder (full charge) 150 g of black powder (reduced charge) | ||
165 g of smokeless powder (Würfel-Pulver C/89) | |||
Common shell | weight : | 4.3 kg - charge : 94 g of gunpowder | |
max. range : | 4000 m | ||
Shrapnel C/88 | weight : | 4.355 kg – charge : 55 g of black powder 85 bullets x 15 g | |
max. range : | 2200 m | ||
Shrapnel C/91 | weight : | 4.355 kg – charge : 55 g of black powder 170 bullets x 11 g | |
max. range : | 2200 m | ||
Ca shot : | weight : | 4.2 kg | |
max. range : | 300 m | ||
Muzzle velocity : | 294 m/s with full charge 152 m/s with reduced charge | ||
Remaining velocity : | 228 m/s at 2200 m with shrapnel 195 m/s at 4000 m with common shell | ||
Angle of elevation : | 500 m – 1° 14’ 1000 m – 3° 05’ 1500 m – 5° 09’ 2000 m – 7° 31’ 3000 m – 13° 16’ 3500 m – 16° 55’ 4000 m – 21° 12’ | ||
Angle of descent : | at 100 m – 0° 24’ at 500 m – 2° 04’ at 1000 m – 4° 17’ at 1500 m – 6° 52’ at 2000 m – 9° 52’ at 2500 m – 13° 21’ at 3000 m – 17° 25’ at 3500 m – 22° 06’ at 4000 m – 27° 12’ | ||
Length of the line of sight : | 940 mm | ||
Elevation : | + 20° / - 10° (original carriage) | ||
+ 23° 12’ / - 6° (new carriage) | |||
Wheels | weight : | 55 kg | |
track : | 0.83 m | ||
Transport : | 4 loads: 1 – barrel (130 kg); 1 – trail; 1 – wheels and shafts; 1 – two ammunition boxes weighting 48 kg each | ||
Ammunition : | in 1889 : 64 common shells, 40 shrapnel, 8 ca shots in 1912 : 138 shells | ||
Remarks : Slow firing steel mountain gun without mantel, equipped with a cylindro-prismatic wedge breech mechanism with the expanding steel obturation ring system Broadwell. It fired the same projectiles as the 75mm field gun M. 1886, but employed a lighter battering charge. At first the charge was compod by Feinkörniges Geschützpulver (black powder), but later the gun was modified to u the smokeless powder (Würfel-Pulver C/89). It was equipped with rope brake to reduce the recoil from 10-12 to 2-3 paces. Initially this gun was provided with a carriage that proved to be unable to withstand the force of the recoil to such degree that sometime it overturned. Therefore in 1892 it was removed and replaced with a stronger one. On short rides the old carriage could be towed by two hors without using a limber, by means of a shaft, which could be dismantled to be transported by pack hors. | |||
More pictures from a Krupp catalogue | |||
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