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FIGHTING VEHICLLS ZiSEiRC- _____D 71 -L .

COPY NO: 20 PROJ MT NO: G39/RG/97T-

FIL NO: FVIA 47/01, M 5/012 R-OORT NO: FT 2239

RUNNhING- GEAR BRA,NCHI COVER SIEET

TO

DEVEMCPYIENT TPIiL 'A' VE-I-IS MEPORT

ON

MEE?~ DAMk (ED TPRi'CK

1. ORIGIN

Trials simulating mine attack on light vel-icle tracks were crriedout by R.A.R.D,E. This report covers F.V.RD.E. trials vith sectionsof the mined track, wich Nxro damaged but not severed, toestablish 'kill' criteria.

2. C0h2,,UI]TS

2.1 The mine trials were carried out at P. and E.E. , Shoebur3acssand are covered by report No. SX/)-57/01., h track usuIwas FV 420 vehicle pattern Dry Pin Steel Narrow vAicel ))athassembly No. Tj 337635 as being typical of the trac. iee. enlight vehicles. Scctions of 7 or 8 links were reccivrO -th 6-1oactual daaged areas a poroximatcly in the middle of the sectioiz.

2,2 Guide horn misalignment due to the damage was ap-arOnt in allsections but in only one c%ase, section 17, IT-s (i.ficul1;exTperienced in matin3 the dmaged section ith the romainderof thc track.

2,3 For convenience in describing the daage reftre5-ce s ae,

in report SXPV457/01, to the nuber of shear plues rc!iin1nL;intact after the mine attack. These planes a-c considorcd tobe parallel and in line vith the track containing the edgesof the lugs across the pin Joints. Section 17 is an exr:?leof extensive damage nd had two shear planes left th1roughwhich the driving load vs carried.

2.4 The runn1ng!: course shown in Fig. 6 was arbitrarily c'.osn %S

being tyrpical of the typo of cross country over WIich the

vehicle vfas likely to encounte'r a mine field. After al-tack,if not immaediately disabled, the vehicle would have to move,unaided, to a cleared area to enable the crew to carF outrepairs. The length of the course Yrs considerel acLequatefor -this purpose and if the damaged track prevented tismovement the attack vras considered a 'kill'. This trialsatisfactorily demonstrated the ability of lijit track tocontinue running ifter sustaining considerable mine cia.-c,

3 CONCLUSIONS

3.1 In each test carried out the vehicle comoeleted the course

satisfactorily. Additional deformation under the CLriving (4tension occurred at the damaged area with section 17 but N.this did not noticeably worsen running capability. No tv

'killt was recorded with any of the sections.

Best Available Copy Approved for Public ReleaseDistribution Unlirnied

RTUrRY NO. Y[% 2 1 9

3.2. For this light track assembly No. FV.337635 the followingdesign criteria were determined based on the arbitraryconditions given in 2.4.

3.2.1. 'hen track is not severed beyond section 'AA1 in.icatedin the figure attached to this cover sheet No 'kill'will be recorded.

3.2.2. W!hen the track is severed beyond section 'AA' the sectionof links will be subjected to a vehicle running trialsimilar to that described in this report. If the trackis throv or is broken at the damaged section a 'kill'will be recorded.

3.2o3. If the damage is less than in 3.2.2. and longitudinalmisalignment of the track is less than 2in over a totallength -f 5 -itches on either side of the damaged areaNo 'kill' will be recorded.

3.2.4- If the damage is less than in 3.2.2. and the misaligmentis greater than 2in over 10 pitches as described in3,2.3. the damaged section of links xdll be fitted to avehicle and if the vehicle when run over the course infigure 6, is immobilised for any reason associated withthe sispension, a 'kill' will be recorded.

4. FURTHER ACTION

Vehicle tracks of different design will be subjected to field trials, asrequired, after mine attack to establish 'kill' criteria.

'ssistant Director1a n uing Gear)

(C. Du~nb,rDirector

F.V.P.D.E. (Ascot 1160)Chobham Lane, Chertsey,Surrey.31st AuIgust, 164.31 93/6/c.D

DISTRIBUTION

D.G.F.V. IDD(T) 2D/RG 3-4D/PC(T) 5T/S 6-8S9F.V.A. 10R. A. R. D. E. (Langhurst) 11W/FV DRS British Embassy Washington 12C.A.L.E. 13-15U. S.A. S.G.U.K. 16-21A.A.S. 22-23Army Department Br. Lib. St. Christopher House 24Spares 2 25-30

APPENDIX TO COVER SH193T

SECTION AA

4-9986-1

REPORT NO. FT2239

eport No. FT2239

FIGHTIMG VEHICLES RLSEARCH AND LEVELPIENT ESTABLISIMNT

Development Trials 'A' Vehicles Report

on

Mine Da a&ed Tracks

T. Introduction

Ten sections of dry pin metal tracks were received at F.V.R.D.E. afterbeing subjected to mine damage at R.A.R.D.E. These sections were fitted inturn into the track of a tracked load carrier (FV.421) in order to determinewhether the vehicle would run a reasonable distance with the tracks in thiscondition.

2. Reference

Project No. G39/RG 97E Serial No. 14823

R.A.P.D.B. Report No. SXR/457/01

3. Equipment

3.1 Vchicle, FV.421 Reg. No. OCCA 25.

This tracked load carrier vas weighted to 13 tons 16 cwt. track guardswere fitted without valences.

3.2 Track Sections. Ten sections of dry pin metal tracks,- as receivedfrom R.A,R.D.E. are shown in Fig. 1-3. These sections were eachidentified by the numbtr painted on them by R. A. R. . E. (Ref. reportSxW)57/01). Drawing No. of linX FV.351283.

4. Amn

To determino vhethcr the vehicle could have been driven a reasonabledistance after the tracks had been damaged by mines.

5. Method

5.1 The track sections were photographed and then fitted in turn to thevehicle. The danmed side was alvays fitted facing towards the centreOf the vehicle with the spud trailing.

5.2 After fitting a section the vehicle was moved to give the track onecomplete traverse. This was done to confirm that the damaged portionswould pass over the suspension components. The short cross country courseshewn in Figs. 4, 5, and 6 was then used, the vehicle was acceleratedthrough the gears along the straight, slowed down for a steered turn andthen returned to the starting point. A skid turn on concrete coaleted thetest circuit 4lich brought the vehicle into position for the next sectionof track to be fitted.

5,.3 The trial ias carried out in = October. I The weather mas drybut rain had fallen (prior to the test) and the ground was wet.The selectcd course vas on sandy soil.

6. Resultz

See table at Annex A

6.1 The condition of the track sections after removal is shown at(Fig.*

Report No. FT.2239

7. Observations

7.1 The course was level, easy Eoing and conmiAered to represent normallight cross country.

7.2 The horns bent by mine blast tended to foul the road.wheels and itwas evident that ounsequential damage to components would be caused byprolonged running.

7.3 The sprocket engagement holes damaged by the mine blast caused the trackto ride up on the sprocket teeth and resulted in very rough running.ivhere damage across the track vas extensive there was some slighttendency for the links to open under driving tension, However thisdid not affect running with the loadings sustained in this trial.

7.4 No instance of track shedding occurred during the trial.

8. The Officer i/c of Trial was - Major R. W. E. Day R.E.

(Capt. J. M. Barrington)Officer i/c A.2 Section

(R. F. Tipper) ColonelDevelopment Trials 'A' Vehicles

F.V.R.D.E. (Ascot 1160)Chobham Lane,Chertsey,Surrey.22nd August, 1963.

1003/63/EV.2.

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