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| U.S. EXPLOSIVE ORDNANCE |
| PART 1 - PROJECTILES, PROPELLANT, AND PROECTILE FUZES |
| Chapter 4 - PRIMERS AND TRACERS |
| Section 3 - TRACERS |
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Mk 11 Mods 0-3 |
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Over-all length, inches |
1.78 |
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Diameter of head, inches |
0.925 tapering to 0.65 |
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Starter pyrotechnic |
Magnesium powder, barium peroxide, and aluminum |
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Illuminant |
Magnesium powder, strontium nitrate, am-monium perchlorate, charcoal, and wax |
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Color |
Red or non-luminous (dark) |
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Projectiles used in |
40-mm H.E., H.E.-I., and B.L. |
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Ignition method |
Propellant gases heat or burn through the brass closing disc and ignite the starter which initiates the illuminant |
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Remarks: The only difference between the various Mods of the Tracer Mk 11 is in the construction of the realy housing: |
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Mod 0 - Housing is threaded |
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Mod 2 - Housing is a push-fit |
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Mod 3 - Housing is an integral part of tracer body. |
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The relay housing contains three black-powder pellets, which are ignited at the end of the burning of the tracer. The pellets, in turn, initiate the main charge of the projectile. |
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The "dark ignition" loading of the Tracer Mk 11 has the starter pyrotechnic of 65% barium peroxide and 35% powdered silenium. With the substitution of silenium for the magnesium, the tracer does not become visible until some 200 yards from the muzzle. 40-mm ammunition using the "dark ignition" tracer is labeled H.E.-I.-T.-D.I.-S.D. (U.M.). |
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"Dark" Tracers Mk 11 are non-illuminious; hence invisible day or night. They permit time of flight of 8.5 to 10.0 seconds (4,200 to 4,600 yards) before self-destruction. A small, intense flash immediately precedes the flash from the bursting projectile. This am-munition was designed for night director-controlled fire. Lots are labeled H.E.I.-S.D. (U.K.). |
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Figure 112. Tracers (not proportionate size) |
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