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'I'M 43-0001-28

CHARGE PROPELLING, 175-MILLIMETER: M86 SERIES

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UAR 189689

Type Classification:

Std AMCTC 5851 dtd 1968.

Use:

M86 series propelling charges are used inthe 175MM MI07 Self-Propelled WeaponSystem.

Description:

(Anci llary items used only with thesecharges are the M1 additive jacket and the M5flash reducer-described below.)

The charge is an adjustable three-increment white bag type. It is approximately49-112 inches long and contains a total of 55pounds of multiperforated Propellant M6 inacrylic viscose-rayon bags. The bags are tiedtogether by four tying straps attached to thetop of Increment 1 and knotted on top ofIncrement No.3. The tying straps are rein-forced by cord tied tightly around the junctionof Increments No. 2 and 3. Each propellingcharge has an igniter core assembly extendingthrough the center of the charge, The coreassembly consists of three rigid polyurethanetubes containing bagged igniter cores of blackpowder. The igniter tubes for Zones 1 and 3 con-tain bell shaped ends which assemble over the

AOOITIVE JACKET

uAR 199688

ends of the igniter tube in Increment 2. A redcloth igniter pad, filled with black powder, issewn to the base of Increment 1. The ignitercore for Increment I is sewn to the igniter basepad and is loose in the Increment 1 ignitertube, The cores for Increments 2 and 3 are tiedinside the igniter tubes for these increments,An igniter protective cap is placed over theigniter base pad for protection in shipment andstorage. An additive jacket is issued separatelyfor assembly over Increment 3 when firing fullcharge. (The majority of M86A2 charges areshipped with the additive jacket already assem-bled over Increment 3,) All charges are packedwith an M82 percussion primer. An M5 flushreducer is also issued separately to be assem-bled around the junction of Increments 2 & 3on certain M86Al charges, It is designed toreduce excessive blast and flash effects asso-ciated with certain lots of Propelling ChargeM86Al. The flash reducer, which contains 16ounces of potassium sulphate, is an apron-typecloth bag designed to be tied around the for-ward end of Increment No, 2 with its leadingedge at the junction of Increment No. 2 and 3.

Use Flash Reducer XM5 with Lots IND 1-19 through IND 1-77 of PropellingCharge M86AI when fired at Zone 3 only.

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TM 43·0001·28

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Bore-wear-reducing Additive Jacket MI isused with Increment No, 3 when firing M86Series Propelling Charges at full charge, It con-sists of two 10-112 x 18 x U8-inch cloth-backedsheets of additive mixture stitched together.The additive mixture is composed of 47 percenttitanium dioxide and 53 percent wax. The clothbacking, which is bonded to and overlaps thesheets of additive mixture, is stitched to anunbended tough plastic film casing whichserves as a jacket liner. When compressed alongthe seams, the jacket arches to form a cylinderwith a diameter of approximately 7-1/2 inches.

elf the additive mixture is cracked orthe plastic sheet is ripped, the additivejacket is still acceptable for use. Usethe additive jacket over Increment No.3 only. Use of the jacket on IncrementsNo. 1 and 2 is ineffective.

eIn a tactical situation, if additive jack-ets are not available and the mission isin jeopardy, a maximum of 100 roundsper tube may be fired at full chargewithout affecting current condemna-tion limits of the tube,

Functioning:

When the primer is initiated in the breech-block of the gun, flash ignites the black powderin the igniter pad. The flame proceeds throughthe powder in the igniter tubes to accomplishuniform ignition of the propelling chargethrough all three increments. The burning pro-pellant generates rapidly expanding gases to pro-pel the projectile through the gun tube at thevelocity required to reach the target. When theadditive jacket is employed for full charge fir-ing, the mixture of titanium dioxide and wax inthe cloth backing serves to reduce bore wear atthe origin of rifling in the cannon. When theM5 flash reducer is employed for full charge fir-ing, the potassium sulfate serves to reduce theamount of blast and flash which occurs.

Difference Between Models:

The M86 has a 4 ounce igniter pad and all3 tubes are perforated. The M86Al has a 2ounce igniter pad and an unperforatedIncrement No. 1 tube. The M86A2 is identicalto the M86A 1 except for the igniter tubes,which are reinforced with dacron scrim. Earlyproduction M86A2's are packed without addi-tive jackets.

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Tabulated Data:

Propelling Charge:Type ---------------------------------

Weight -----------.-•.--.... -... --..•Length --------------.---------------Diameter .-----.--•.-.•..•..••• -----Cannon (Weapon) used with--

Propellant:Composition ----------------------Grain type ------------...•• -••.. -..

Weight .•......... --...• -------------Web -----._---------------------------Primer ------------------------.-----

Temperature Limits:

Firing:Lower limit ------------------------Upper limit ------------------------

Storage:Lower limit ------------------------

Upper limit -------------.-.. -.-•.--

•Packing:(Propelling Charge) ----.--.-- .. -

Container --------.-----------------W:eight :-._---------------_._-_._-_.-Dimensions .. --.---...• -.---------

Cube .-----.----.. --------------------·Pallet:

Weight --------------.-.-------------Dimensions ----------_.-----------

Cube -.------.---------------.--------

White bug sep-arate loadedpropellingcharge58.01b49.5 in. (max.)8.0 in. (max.)M1l3,Ml13Al(M107)

M67 perforatedcylinder, LID= 2. 3555lb0.0776 in.M82

-40°F+ 125°F

_RO°F (forperiods of notmore than3 days)+160°F (fornot more than4 hr/day)

1 charge withadditive jacketin plastic har-rier bag ormetal con-tainer; 16metal contain-ers per palletM46096.01b9-13/16 in.Dia. x 55 in.3.1 cu ft

2020lb40 x 55 x 45-1/2 in.57.9 cu ft

*NOTE: See DOD Consolidated AmmunitionCatalog for complete packing data includingNSN's.

Shipping and Storage Data:

Quantity-distance class ---------- 2Storage compatibility ------------- JDOT shipping class ---------------- B