Mm Ammunition

The heavy load of propellant used in the original N 37 gun caused excessive stresses in engine and

Cartridge For

Figure 2-8. Method cf packing Soviet 12.7-inrn ammunition in bulk.

airframe. The dimensions of the NS 37 cartridge, shown in figure 9-19, indicate its unwieldy shape, which accounts for the stresses.

The refinement of the 37-mm gun which followed World War II included a reduction of the propelling charge, permitting the use of a smaller cartridge case. The smaller case, of course, permits shorter parts travel in the gun, but even more important it reduces the bulk of the ammunition. Figure 9- 20 shows a fired case from an i\ 37 gun which was picked up in the Korean theater of operations.

Figures 9-21 and 9 22 are comparisons of base and profile of a representative group of Russian cartridge eases. The two specimens on the right, which arc rcccnt developments, indicate a trend toward a smaller cartridge. Although there is little taper and a rather vague shoulder, the construction of the base and the cannelure follow present trends. Design features of these cases indicate that they are the work of a single designer or group.

Links

The links used with these two rounds are the stripping type, as shown in figure 9-23. Withdrawal type links, shown in figure 9-24, arc used in all the Shkas, Shvak, Be resin, and VYa aircraft guns. All four types illustrated were used in World War II. The rifle-caliber link used in the Shkas can be used in the DS and SO 43 ground guns as well as the aircraft gun for which it was designed.

Shvak Ammunition
Figure 9-10. Soviet 20-mm complete round icr Shvak cannon. (Round has been rendered inort at a U. S. proving ground.)

Figure 9 9. Close-up oi a iired cartridge ccse for the 20-mm

Shvak cun.

Shvak Ammunition

Figure 9-11. Bulk shipping containers lor Soviet aircraft cannon ammunition. Top, 23-mm, and bottom 20 mm.

Figure 9 12. The 20-mm Shvak round compared with the old caliber .75 Gatling round.

Shvak Round
Figure 9-13. Study of a complete round for the 23 mm VYa cannon.
Pictures Fired Cartridge Cases

Figure 9-14. Close-up oi u fired cartridge case for the 23-mm

VYa gun.

Figure 9-14. Close-up oi u fired cartridge case for the 23-mm

VYa gun.

Ammunition

Study oi a complete round for 23-mm NS cannon

CONFIDENTIAL SECURITY INFORMATION

12011

Pictures Fired Cartridge Cases

Figure 9-16. Close-up of iired carlridge case for 23-mm NS

gun.

yS if

Figure 9-16. Close-up of iired carlridge case for 23-mm NS

gun.

Cartridges

Hgure 9-17. Comparison of Soviet 23-mm cartridge cases, both of which can use the same projectiles.

Left case. old. for VYa type, right, new, for NS cannon.

Machine Gun Amo Comparison

Markings on heads of Soviet 23-mm cartridge cases. Left N3

Ammo Casing

Figure 9 IS. Aitis/s conception of cartridge case used in the Figure 9 20. The new, smaller, cartridge case used in the eld 37-mm NS canr.on. 37-mm Soviet "N" gun.

Figure 9 IS. Aitis/s conception of cartridge case used in the Figure 9 20. The new, smaller, cartridge case used in the eld 37-mm NS canr.on. 37-mm Soviet "N" gun.

Russian Wound

Figure 9 21. Comparison of typical Russian cartridge cases. Leit to right; 7.62-mm, 12.7-mm, 20-mm, 23-mm (NS) und 37-mm

Figure 9 21. Comparison of typical Russian cartridge cases. Leit to right; 7.62-mm, 12.7-mm, 20-mm, 23-mm (NS) und 37-mm

Cartridge Cases

Figure 9-22. Comparison of profiles of Russian cartridge cases. Culibe: of each case is given in figure 9 21. above

Figure 9 23. The cases unci links for the new 37-mm and 23-mm Soviet aircraft cannon. Both cases are Nudelman designs.

Soviet Aircraft GunAmmunition

ZO-mm

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