Lateral Oharaeteristics of an Avro Swept i{iing witb and Without ?lp fanks. 7 June 1950 t H-* tel f,r&&r {./ kl {fl F o Z 4t si gnud.....1 . t : l{il'9-c- :.... NATIONAL RESEARCH CCUNCIL r",. :^..:4*-; 15heet........* ol L O. 5684A 10 Datc * Ju1*, . l.tl:st ' ghlg=_asslFtED LATrLii,ri, fLIil:::;{".T liif :,TIrl:1 il}' ;: 11 ilTrlC,.r]ji]PT i:aIlJG i:.ITH j,l.iD ,,:TTlIOirf TI-"_ T;"..ir,,r, P:'opaned by: l:1.8" ivlacCulsh -al ; _.r'Y r rl ., A'IiCfif,FT T LIBfiAft , :$iF uunu*n ts F d 2 ) 5 I NATIONAL RESEARCH COUNCIL D.r" .'- .{-}r".r....}.$50 A .M. 5694-5 INTR ODUCTI ON ?hls ruamorandum contalns thatunnel mo&$u.r"ements of rolllng mor*Bnt and Bld6 fo"rce, mede on s. mod6l of enLinilted swept wtng, wlth and wlthout dnag and pltching moment massuranents Refei'enc6 1. MODir*L 4. -The p6rtlnent aodsl g;oometry 1s glvon lnFlgure 1. Lar"ge spanwlse cracks, ong on each Eurfac6,had appeal'sd ln the flodol bef6r'e tho tests, and. soriodlstontlon was lndlcated by the fact that ,.i,ttu trre ta1}stlng r^ernoved the tnalling edgos of the two sldes of they1!€r "t the csntne, wor"e dlsplaced vortlcally abouil/B lnch. RANGE OF TESTS At lt.N. * 2.2 x 106 tho mod,e}, wlth and wlthouttt4"r. was yawed froom -ao to 160 at erich of six valuesof CJ; botwssn about z6rro llft and C1*o*, At R.N. * S;0 x 106mea8urements *g''g-ryade, w lng aroner-T6fr tne sams angloof-yaw nango at llft coefflclents of 0.01, 0.1g, i.BAand 0.158. Sheet 2 ci i[' i 1..r :: €rd4l I. o La .esultt of lqlnd , 1r.'* ulng ifiQ'tcilL ,'* Y. Iloe Ca-:-,i.;lr* l-l:. +r-nl,^ t.i*'&',J.j., rJa'rl1Dt t-i.t. lt, rj,CFA Y'8i.rC-t t'r-1. ln 7 The model was aesumod. bo bo symmetr'iear aboutIte horlzontal csntre plane, hence, ti obtaln the inten*fe,enco of tho nal-n st.p;s, -whlch.a.e noremally on ttreItlgh pr€ssu,s slde of the wtng, the model, *iif, a";;stnuts mounted, w&s pltched. nii+latlvely ra,[hor thanlnve''ted. The tests revoar-ed tttt re itrut tnter"f erence, !y! the compononts rneasur""ed at posltlve angles of attackd'ld_not -agree wtth thoss m€asur4ea at eor"r.eipondlr:g li.ftcoefflclents ln tha negatlve arrgle of attacl ,*ngE.Funthen tests. w6r.o made, thenefdr", wlth du,my e[rutsmo,rnted and the modeL pitehed, poslilvely, to h^stermlne theeffect of struts on the Iow p:"essurre sllti of the wlng.consldenable stnut lrite*ference was noted, in thls c*f*,but rvhan- the af,pl4oprlat e coh?.ect lons ws?ns applled totho results cbtalned at neigatlve angles of l+i;taci< theqlgye dlsagrnoement w&B stlrl p',"esenf,. To explatn thlsdlfferenco ln the latenal fonce and monent e6mponentsli ?vas concluded that the mocleL was aerynetrlcll. Si sned "...::,,1 "c .li u. i i+.qii.., ...... .. Date ..ry .i,r,li:r 1!]50.. NATIONAL .RESEARCH COUNCII. A . FI. 5694-5 5heet........ S ol L O. 56844 10 5. ?hls conclusJ-on ls based on that the durrun et'r"uts 6x&ctlY and that the fl"ow ls unlform out by the model. RESULTji The nosults axe glven 2 to L2. the r€asonable assuniptlons : slmulata the n'rain struts, wlthln the volume swePt ln Tablos I t a V a.ncl Fl.;;1 - -inlI Irr:" lri ofne:lt: The :ro1llng floment $, v;ith crnct wiiliout tar:ks , - &-s plotted ai;;*lirst ringle of ya"*,' ln Fi-5n" 2 and 5. Val-u'es of 1,,. msa$uFe,:l lrt zercs Y{l,{ iar"e plotterl j-:: Flg" B. Tne latt i- drc*€tr 3oIi , 1nd.icat.1-:161 mo,e stabL 1-lty, hs Ci iS inst,ea$od. up to 0.5 :1,'he"e Iy beglns to increase unt1l Lnstabllity' ls Jndleated above CL : Oo?, win.; alone, and (1" [j5 lvibl-r iip btrrits. firl.s unstab]e ch;rrrpie lndlcates tirat tho 1lft on lho leadlrrr,; iialf"oi'ti:e wing f*rl}s off $rsnell than the l-1ft on the toerlll:r i:Ylq_;i t:a':< IE s g8 g Irt;iIi ,;l l, l Lr! : il 1r+1 lirr #+t.t ft:r' 1. 't U +-.1 i l+i j'jil Fir ii -.t '1 16.1 ti:l:; t"_ rj+i - iri l- /a . /A Ld{', ,i i_ {E ai 7,8 i;i' \::t i::r .t ._ i :i :'14,/),', r6 :.1 //. d/j:;r rl .i +' !L :-l.l} irTrii ,i -...'t,l .-'l 'i,} ,t1 r{ s/) 't.1,/, i/" '4-t '1 1 'i._t I I at ti !i-+ r/" :.: .i /t?'| ?A 6, ., j . .1 ..11. I fr, V, r l-r n ''1.1 .i :f lliF 'i o,4 'Je. 75 I-II I I + it:t' t ,,+ T ''l ,,,.1 I :,.7 I ::: I r,, : > {l}I I 11 i:il'arji .."--- I ! .! --,.'' 4 -;-ll .?-. ':.: i I '.1 ri-.:-.r- t.t 1_,i.. tt. 11 r +i t- E,, t , i-+ ;:l''--i---- i,l-:.:,t . 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Lateral Characteristics of an Avro Swept Wing with and without Tip Tanks A.M. 5684-5 L.O. 5684A

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