VF 393 .A1 N3 w-1157 1945 c +a

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3.5 INCH AND 5.0 INCH AIRCRAFT ROCKET 3,25 INCH MOTOR I

a.. The 3.5~inch and the 5.0~inch Aircraft Rockets rle~ribed jn this punphlet are @W.abiljzd rockets udng the 3.25-inch Motor Mark 7 Mad 0 as the propulsive wit.

2.pMufpm . ’

. a. ‘he rocket equipped with a 35inch solid s&l head is dc$ped for peoetratiqg the hulls of sub mar&n and other lightI)r armored VCSS&.

b. The roc& quipped with 3.5inch or 5.~&I

high explosive heads are htended’ for use apinst targets such as shipping, pwmnel, bivouac areas, and light armor.

a impulse pmsses t&rough a quib in an ignite located in the forward end of. the mntor tube. The squib sets off a charge of Mack powder itl the i&liter, fill- ing the interior of the motor’.tube with hot burning gas under high pressztre, which, in, turn, raisee to

ignition tmpemture the surface of the pru@mt

3.5 -imh HeaA Mk 1 or 2 6 16-12-41 H LZS. 150 3.5 -ih Head Mk.3 or 5 . . 6 , l6g-1354-g .’ 1.4 135.5 S,O -in& Head Mk 1 Nod 0 ‘2 . . 24+12+7%. 1.2ii IN5 3.25~inch Motor Mk 1 Mod 0 4 .5215$.&15$$fl 6.B 189 NCISC Fuze Mk 148 Wwi 0 28 . sB/ia Diam,-13~N 0.57 32 Nose Fuze Mk 149 *Mod 0

* Each Fwe comet i.n an bdividustl metal cati.

3,54NCH AND 5.04’4Ctl.AiRCRAPT ROCKET AMMUNlTlON OP 11157 tlsf Rw.1

--

Z

r

It pm@& the threads on the front of the motclr and seals the front end ot’ the motor from rmisture and fore+ matter cluring shipment tid stw+vilg~A

(2), CARDBOARD TUBE AND WASEEK In the front end of the motor ate several cm-dbc~td washers and a spacer tube used to 3111 the space remaining in the tube after tb e other componmlts of the nu~tor have i>emr loaded, When assembling the rocket head to

the motOr, nolrle of the carrlbrd spacers~or W&INS are hl be re#OVed.

(3). FELT PAD. The igniter is protected from &K$c$ by the felt pad which ako t&s UP any change in the length of the pmpelknt grain due to themd eqansion. The felt yad is h&I in place bp the m&baafd washera, which are cem&ed in place to the interior af the motor abc,

(4) d UNITER MARK 9 h!b 0. The igniter Cm- s&s of a plamic ~3~2 containing Ma& powder an4 au electric. squib. Leads are mnected to the squib and pass through the motOr tuk to the nuzzle where they are connected to the r?lectricat CunheetOr used in

lirhg the rQcket+ I

(15). . INHIBITOR-FRONT. Tlw inhibitnr is made of plasbic rnatetisl and is cernlentcd to the. front end of the propelknt grain. It aids in controlling the burn- ing area of tlz propellant atrd, thcrtzlvy, COW& the

prewur~ which is dev&qxd.

(6). PROPELLEXT &MN iktAlk# 13 MOD 0. The prupeilmt is a simgle g&in of ballktitc shiped in the form of a crws. Inhibitor strip, cemated to the g&in, control the burning area of the pin and, hence, the pressure dcve@d within the q~olor tube.

‘( ?> . INHIBITCJR-REICR Thirs inhibitor is mark of plastic ma&al md is cemented to the mr of the

grain, thus waratiq the grain from the grid. Pins on the grid tit thtuugh holes in the inhibitor into rqcesses in the end of the grain.

(8). C&ID. This is a steel support for thr! propel- lent gkill having a arms-section similar to that of the propellcn~ grain. The grid, inhibitor-rear WN.I the propellant are preventti frwm rotating int!epndMlp by theif interlocking NMruction. The &rid keeps tic gmin from moving toward the rear when ig- nit4, where it might clng up th nw~k and prevei-~t the games from escaping, causing the rn&~r tube to burst.

. 743574 d '. 47 2 RESTRICTED . 7

,“.\ ARMING WIRE WIPE

NESTOCK CIUPS -

.

. ‘.

,

,

I

i

7* FmmB a. Nasa he hrk 149 k&d'@

(1). If ~vajlabh, OP. 1017 shcmld be studied for

a more complete descriptj& of this fune.

(2)- l3s.s~p~1o~. This fuze is an air arming, im- pact firing Sure designed for use with 3.5-k& and 5.&&b Forward Firing Aircraft Rockets. The ftm. bdy fits difictly into the fuze seat liner ritlg in the nti~ of the rocket without requiring an adapter.

In the una;ined position, the firing pin is scrrr~ed ’ down almgside the detonator shutter holdinR it .in II

safe pitih, The pmpelter is attached to the firing pin and is premted from turning by. thfz propeller locking pin, which IS attached .to the prqMler lucking pellet, The cap on the nose of the fuze is held tightly in phcc {#I ‘the m&et by .a clamp assembly heEd together by a safety wire, or a ‘fuze arming wire when the round is loaded OYI a launcher, and is wady ti, fire. This cap prevents expmure of the fuze to the weatlter tid is removed c+ when tht projectile is fired. A cap sprhg Iocated utlder ~Iw cap bears CHJ the top of the propellc~, prcvating it from turning as long as the cap is secur4 by the safety or arming wire. When an aawmbled rend is Ibad&! CM the launcher the arming W~I-P is first inserted ia a hole providtrd next to the ssfetp wire in the! cIanq pia and bushing asmbly, after which the saftiy wire is r+yxwd. THIS ORDER MI[;ST NOT BE RE- VERSED OR TKE CAP WILL FLY OFF Ex- POSING THE PROPELI,ER. . .

(3). HOW IT WORKS; When the rcnrvd is fired, the trrmiq wire puIls fre, r&aqing the &rap am- bly, allowing the cap spring to ‘thrpw off the cap, thrra exposing the propeller. At the aamc tim, ac- &ration retracts the prop&r bcking pin, Reid&@ the prop&m4 ks long a$ ac~~kration cW%HM%, the detonator shutter is Locked in piam by tlx shutter lock& pin which iti attached to the shutkr kxkirlg p&t. The pmpdlcr fums &ward in a ChWkxb+e dir&icq cleating tht: dtiotlator shutter, Abcmt 8 turns of the ppp4ler are squired for &e firing pia

. to rekasre the detorrator shutter, When accekratim cm-, the &utter bbcking pin is withdraurn by ‘the acticm of &e actback spring M the shvtter locking pellet, and the &km&or shutter ia swung into ihe

armed p&km by the act&a of the shy&r spring, provided tic firing pin has by this tia admttti suficientiy tct clear the detonator shutter. The shut- ter is focked in the armed poti& by the detent en- RaRjng in a hole in the firin@ pin guide. The fitiq

.w RES-ICIEI)

. . . ..-..

I CCMlCAL NOSE PLUG -

s+” RcxKEY HEAD MARK I -

MOD. 0 AND Pm AbAPTEk

.

.

T,- . SHUlXU LOtKIWi PELLET

- CLAMP _ - -..._ - -

. r

SHUITEP kC)CBflNG PIN

Y-M PPI NG tVA.Rb

ARMING WIRE GUIDE

NOSE FUZE MARK I48 MOO. 0 AND AOAPTER

free the detonator shutter ; Seccnd, as mehtiond above, as the mleration increases (with increasing initial 6rhg tempraturc) , tbc friction between the shutter atrd thl: lead-in &SC inmeases, md arming is

often not completed until propelhni burning 6c~scs. Meglecting this friction &3X, the! minimutn arming distance due to the pr~pdler torque an lx sunjrcw- iced a8 follows:

-- . . . . . . . . Aircraft Sped Mhimum Arming Dist.w~c~

{ kms) from Aikra ft { f cet)

0 .300

150 . 150

m 1’25

350 - 40 ( reimnted) --

FIRING PIN

J=lRING PIN SI’RINQ

PMSSURE ChAMM

INLET SCREW

.

-. MAGA;U~~E

-- mlw

SPACER SLEEVE

.M tNG PLUNGER

‘-- lllwl

--C?RIHCE

- INLET SCREEN

- INLET ICWP

14

.

3,5=1WCcI AND 5.61NCH .AERCRAFlr ROCKET

lb - RESIRtCrED .

{b)- See th& the lug bands fit the type of hunchcr jnstalled 011 the aimIt. A boss VII t.k k;de of thh Ixzar lug band should drop itlto a depreshon an the mmt tube whm it is hwd Up properb with the front lug band. If the motors, as issued, have buttou lug bands fore and aft, they wiU 6it ckiy Aircraft Launcher Mark 4 Mod 0. If they arr to be u& with Aircraft ~Launcbx Mark 5, Mods 1, 2, or 3, it fill h ncreartary to. remove button after lug bend and replace it wi& a tunnel lug basd. ‘If the tiet is to

. be fired irotw a Grumman Type Launcher, either lug band rnair be used on the aftcf end, but if a butttm ‘is used, it must be rotated 90 degrees horder not to strike the forward Jauncher pnst on firing.

(c ‘5. Push the fin ;~ssembly onlo the rear end of tlw motor until- it is pbsition@cl agai&t the rear lug

Exwl, with the lug band cenkred between two fins.

(cl}. Screw the tail ring onto the m&w, ‘l&&q

the fin assembly in plaw.

(c). Wsscrew the froIlt shipping cap f ccxn the mottx-. Do not remove w-t)- of the cardboard washerg or spacers.

(f). Strew the head onto the frunt en{1 oi the motor, using a suitable wrench. When the hvad and motor are crwx+threaded, separation may be CX- mcd to mxur on the la&chcr. With then 3.5-inch Aircraft R&et, 3.25-inch Motor, aossthrtading is e;lsj!y detecied by the one-half inch or more spaw that scparakes the head skirt fmm the forward lug band when improperly assembled. With the S.&inch Aircraft Rockt, 3,25 -inch Motor, cross-threading

rtwy lx d&x&d by the c-xpnw-l motor fhreaclg indi-

eating partial assembly.

(a ) _ Unscrew the tail ring and r&~-~~ve. the ship

ptw cap which protects the electrical conocctor in the. rezu of th c mb&W. CAUTION : Leave thd short- ing cIip on the crlectrical C~ntlecIOr plug ‘$ns, as ac7 cidmtal ignition will fire the round at full vchcity.

Rc careful not to break the nozzle closure or dam- age the el&ricA connectnr cabIt nnd plus during

subsequent o~raticms.

{b). See that the lug bands fit the type af launcher jnst&d au the aircraft. A button iug band is

shipped with each X25-inch Motor Mark 7 Mod 0 jn case a chatgc of the mar lug bmd ix neccs.s.ar~~. A

(h). Screw the Now Fuze Mark 1481 Mod 0 into

lhe fuz42 adapter. {i). Do not stand the rouncf on its tail, as this

may darraage the ckctrkal cabk

peratutes defining the range within which it is safe

t* fire the rocket. An attempt to fief a rc~ke~ whose . temperaturk is 1~5s than the Eower tmpcratum in&-

rated w jll WSU!~ in spasmodic or partial burning (often called ‘rchufing” from the noise made b-y the

3MNCH AND S&INCH AIRCRAFT ROCKET AMMlJNlTlON OP 1157 fist Rev,1

b. OP 1235 iltustmtcs how rocket temperature can be accurately computed. Hcawcver, except for very short flights an accurate mmputation is not ne~sary. A good general rule in estimating rocket temptn~.~~ is to consider the r&et the same tern-

gerature as the magazine, if the wket has otily.m-

mtly hen removed from the magazine, but is not yet in flight If the rocket has ~CXII out of ;Che v-

tine for 2 hdurs or more, but not yet in Aight, i@ temprahlre can Ix: considered to be the sanle as the air ten~perat~rr, If the mutld has beets mt of the

mqazinrr for s to 1% hours, tur is not yet in flight, its knqwatuvz can be cc&dcwd’ to be the average between the magazim tempemture am.i air

tempma~ure. When a rocket is outside its safe firing temperature range, it must be te&md to thti safe firing temptwe range before it mn be f&d.

Chatyte in temperature is depend& upaiti many fac- ton, but a general rule to follow is to consider that a return tB 8 safe firing temprature til1 take plaC.e after the rockti hns been exposed for 6 or nmr~

’ hours to the temperature desired. Zf any doubt ex- i5ts as to the nxkt tempcratunt after that fw of tkc aa aca.aate txmptmmre cxmputatiti should be made as illusrated in OP 1235.

3. Until the head is ~~CULTA to it, the motor Is

noa-propulsive The motor is shipped and stowed with the metal shipping cap on the front &d. This cap is of light construetion~and will b.l& out at I-&-

tively low prcssur& The hot gas b&t will issue from !x& ew& of the motor and, hencq constitute a fire htt~ard. E f the cnotors are stowed in contatt with

. one another, it is not probable that one motor will ignite those around it.

I

18 RE$TRICTED

8 z

Ii

20 .