SECRET 2 PER CG RFC 925 FEAF WEEKLY INTELLIGENCE ROUNQUP ISSUE NO From 17 Jun 51 to 2toa K 23 Jun 51 QQNTENTS I IN KOREA 1 Air Activity Page 1 2 Estimate Air Capabilities 6 3 Flak ctivity 13 II OF UN IONS IN KOREEL 1 Air Operations 15 2 Ground Operations 18 3 Naval Operations 19 MISCELLANEOUS i 1 Results nalysis 21 2 Evaluation MIG-15 and 24 IV OTHER EAST AREKS 2'7 AG NO 24076 9 1 10757 Ir an in fl i w MISCELLANQQES 1 RESULTS OF ANALYSIS OF MIGnls COMPONPNT PARTS CAPTURED IN KOREA ThiPower PIIant The englhe 1 5 a ecaled-up vers1on CT the Nene- turboaaet eng1ne I The 1 Ncombustlon chamber has approx1mater greater area throughout the turh1ne 'j bladee Iare longer and QT a NiderI chord and the exhaust nezzle area is approN1 NIIi Ii imately 30% larger than the Pratt Whitney Name Engine 5 42 fina1 tailpipe Iangut almoet 1dent1ca1 WithI the eNhaust nozzle I-area QT heITay eninne 3-48 I The heelc deelgn features of the MIG-15 power plant such as com-- 'NTTbustlen chamber of- larger inlet and outlet areas larger Iturhine bladesj Tuel anZles with INfloN numbers -hetweeh the NeheI and the Tay and 4 inw hT f Ngicreasod exhau nozzle area infer a euhetantial increase in ImaSs airI flow I 1ncrease ImaIsS flow along N1th turb1ne 1nlot temperature cond1t10neI 3N Perm1ee1ble because of goed heature31stant blade Tigand reasonable component 0TT1010n01es 1nd1catc that the heels I power plant should be capableI 0T atta1n1ng a max1mum sea leVel atatlc approx1mately 6000 pounds I I I I I The power plant d1 not 1nclude Ian aTteTburnor The a1rplane ta1lplpeaNs NITjdlamoter andI length are a sizeI that would permlt thIeII uSe of an afterburner A approximately 1000 pounds thrust augmentation It iS estimated that a level maw1mum1thruet IOTI 7000 pounds be P0551131O With the use Ii a small afterburnerThe turb1ne blades and combustion chamber assembly aIre of the ha51c 1 1 3 trig 11 1 11 11 LLResulte of Analve 013 of NIGwlg Component PerLs Captured in KO rea GOSSIS The ooneruet1on oiighe herlzontal Loll ourfece is_ very Similar Lo Lhat' I Lhe Noth Amer1een Except for a st_eel main Spar th hor1zontel 11 constructed 243a The maLorlals ueedaln Lhe eng1ne er1 generally similar Lo Lhose used Rolleu oyee en1 Pratt Whitney and 1ndlcete LheL this plant could L fq5operete eL Lurhlne 1nleL temperatures similar Lo the None and' the ISSfiigDes1gn -and Workmanshin1I I I I I The combustlon chamber deolgn of Lhe englne infers LhaL Lhe SovieLe inw LSESiieluded substantlel amount of nat1ve development along wiLh Lheir knewn ' 73X L jprocedure of dlrect dupllcatlen and eopy1ng Construction of Lhis component L LLreveals that Lhe have overcome a weakness which has constantly p13 Lgued and confused the extremely cpmpeLenL comhusL ion developmont 0r888188t108 'LSsteOf LucaS England developoro of Rolls oyee combustion systems PIS8S d1f1eeLlons for 1horeaeed d1lut1on air represents an improvement which could be successfullj atLo1nedkby eiLher or Lucas - Other 01 Soviet neLive development capabllit1es are also exh1 o1ted in the combustofjellement of the power plain Th0 insertmont 0f LS81T1e1nforcomenL rings 1n the liner porforaL1one loeaLed in the hot zohe of Lhe chamber the increase in gege- of metal us ed in the hoL zone line and an 1mproved duplex fuel nozzle SovieL cap1b111tles 11 1n Lhe fleld or development es pertains Lo g1 Lurblnos I I I General workmonehlp reflected in all of Lhe turhOHJOt Lng1ne perLs iS and entlrelylagceptable by Amerlcan and pracL1ees Prom Lff1L10Sey 1h the erL ofL was perL1culerly ev1denL A88LY815 Of SSViet teehn1quoo end praet1ces showed Lhet the Sov1etp he_d8 a firm grasp 131Roeulte of of Component Parts Captured inI Koree Cont d the ert of reeletenco - particularly Wee the quel1ty of proflclency attalned 1n weld1ng three th1ckneesee I I II The general quellty of workmanship and type of construct1on of the 1Q 1 appeere to be comparable to Amerlcen Standards ex 1Tj1iIcept -fer Ithe method of mess balance wemghte for ech1evlng 11 1 1etat1c and dyhemlc balance control surfaces Sovlets letteeheQ maQQ_ 11 111Qh11ence approx1matelv threQ pounds each to e1Qthor inI11- glove type manner wh11e the usual Amer1cen preetlce for allev1et1ng 1 1111fluLter of a control surface 13- to employ d15tr1buted leence wengte rather 1Q i 11Q ithen concentrated balance we1ghtsThe etrueturel deelgn is e een of- 1nherent structurml d1ffleult1ee sucQ111hf 'I111 ia5 fatlgue cracking except for theI method used 1n obtalning elevator baln The workmanship en the surface appears to be excellent with the ex 1f1351 1'Q1g cept10 of one practice that I13 spiking nets both large and smell in place 1 1'1f1fto prevent them from coming loose II IChaI ac beI iS'blcs and Performance II I- 11-111-i AthQUgh an estimate of 6000 pounds thrust would give a sea level max 1QQ $11mum ee Of 584 knots and level rate of el1mb of 10 400 ert per the cond1tien of the captured turbine blades indicate that the h1gh 1 turbine 1nlet temperatures have not been used and that en operetlng I'1111i11thruet of less than 6000 pounds 1Q being UtillZed- Assuming a reduction 70f pproxlmetoly 8% in the estlmeted deelgn rating Of the POW33 plant berQQ 1 lower turblne 1nlet temperatures and reduction 11_i fln component eff1e1cnc1es sea level m1x1mum rwte of gelimb of 9700 feet 11 1 111P0r mi ute 18 calculated to he atte1neble by the new mun-4 of Analvsme of Component Parts Centured in Korea Cont dl A I tho Plant water l JOCtlon approximately pounds thrust would be provlded for short duretion at takeoff FA Conslderatlon pf all by the horizontal tail that the elevator contrOl Syetom ehould be boosted if high acceleru pullmouts and turns- equivalent toEF 86 performance are to be realized AnhgiAIneufflolent components were available to determine the exietenoe of such a oystem however reports from the theater of operations have consis commented on the low aoeeleretlons develOpOd bY the _in ' 'Afgimeneuvers indicating that the alrplanos might not yet Ibo equipped with AAelevator boo Since the range is determloed primorlly by the aircraft configuration is that the combat raggo end radrue will not be substantially dUe to the larger thrust engine A more powerful ong1n9 merely in that the aircraft will obtA1n maximum range At a higher altitude I 2 EVALUATION oF THE FIG-15 AGAFFSF THE The folloWzng excerpts are from IR l5w51 13 May 1951 a_nd are for Round readers 1ntereeted in eg- comparison of characteristloe ' Vf the MIGwliiageinst the Athhe MIG has excellent acceleration characteristlos and -against the A Ah hav been able to jeln combat And break off combat -et W111 Encounters with 86's haVe indicated that the are capab1e Of speeds up_ _to 9' The The meet A Gaelons pulled away from the F-86 in d1ves _                     National Security Archive    Suite 701  Gelman Library  The George Washington University    2130 H Street  NW  Washington  D C  20037    Phone  202 994‐7000  Fax  202 994‐7005  nsarchiv@gwu edu