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- SCAL€ BUILDER MODEL

SEPTEMBER1gfXI

a''24-as 51


BOSTONIAN

BEAVER

By WALT MOONEY. . . Althoughthis little Bostonianis not a true scalemodel,it can be built assuchwith stretched so wingsif you prefer,but it will no longerbe a Bostonian, they're cheap! pick . . you cantake your or build both. . Here is a rela tive ly simp le lit t le m odel t h at will f ly we ll an d ha s s om e of t he f l a vor of th e d eHa villa nd Beav er . As a Bo r t onian, il\ wing 5p dn i'' lim iled t o l6 i n (he\ . lr wd\ o ritina lly b uill wilh lhdl r I a . ' in m in rl, a nd h ad n eit her wing s t ruts nor lan din g ge ar fair ing s heet s . W hen it w as co mple ted , it look ed lik e a r a c ing version o f th e Be aver ,s o a s ec ond w i ng w as b uilt. Th e second wing was b u ili wirh a rpa n wh ich would be . t ale l o r a lurelaBt' o l th i. lcng t h. Now t he m odel looked more like a Beav er , s o s t rutsa nrl wire fairin g sh ee t swer e added t o f ill out th e imp ressio n. Take yo ur cho ice , a nd build eilher one. ll you r h oo .e lh e lo ng w ing v er . ion l o u ll hare to d raw u p J 2 4- in( h winE This may b e a little cha llenging if y ou h a ve never d on e it b efo re, but it ' s not h a rd. S imply ge t a lon g e no ugh piec e of p aper, and ma ke th ree p ar allel I ines 12 i n ches apart. Cop y th e tips f r om t he plan a t each oute r lin e. The two r oot r ibs will r e m ain in lh e sa me po siti on r elat iv e t o t h e ccnter line . Dra w thc spar s ,and t he l e a ding and trarlin ged ge s fr om t ip t o t ip. D r.rw in rib lo (.lliun \ eq ually \ pJ r ed b etw een th e ro ot a nd tips . You' ll need 1 6 ribs ins tea d of 10 . The wing s, ve rtica llail, hor iz ont al t ail, a nd fusela ge sid e frame s ar e m ade d i r ect ly on to p of Ih e pla ns . You' llnec d t w o fuscl.rge s ide frame s . I s uSSes t b uilding t he m o n a flat bu ilding s ur f ac e d i r ect ly on to p of ea ch o ther s o t hey will t u r n out as ne arly id en tic al as y ou c an makc t hem . whe n the si de f r am es ar e

c om plet ely as s e m b l e da n d t h e c e m e n t i s dr y , t hey c an b e r e m o v e d f r o m t h e plans . Bot h s i d e s w i l l m o s t l i k e l y b e c em pnt ed loBe l h e r b y e \ ( e ) s ( e m e n l d l r he joinls . I \ e J l h i n , d o u b l e - e d g e d r az or blade ( ha l f a b l a d e i s e n o u g h ) , a n d c ar ef ullv s lit t h e t w o f r a m e s a p a r t A s r ngle- edgedbl a d e h a r a t h i c l r e a r e d g e r hat will piy t he s i d e sf a r e n o u g h a p a rt t o br ea k t hem du r i n g t h e s e p a r a t j o no p e r a t iun: a s ingle- e d g e d b l a d e i s t h i n n e r ' and won l r aus e t h i r k r n d o f p r o b l e m . Once the fuselage side frames are 5epar at ed, y ou c a n b e g i n t h e f u s e l a g e "box " as s em b l y b y c e m e n t i n g t h e s i d e f r am es t oget he r a t t h e v e r y r e a r e n d l t i s im per at iv e t h a t t h e t w o f r a m e s b e ex ac t ly m at c he d a t t h e r e a r e n d f o r per f ec t alignm e n t . \ c r t , a d d t h e , r o r s br ar er a: y ou w o r I f o r w a r d f r u m : t a t i o n t o s t at ion. No t e t h a t t h e r e i s a s h a r p angle in t he l o n g e r o n s a r l h e w i n S r r ailing edge in t h e t o p r i e w . C a r e f u l l v c r ac k t he longe r o n s a t t h i s p o i n t b e f o r e adding t hi' r r o \ \ b r J ( e p . r i r . T h e l e i \ d r im ilar br eak a t l h e l ; n d i n g g e a r / i n r t r u m ent panel s l a t i o n t h a t m u s t b e d e a l t wit h in t he s am e f a s h i o n . lr y r o Bc t th e f u s e l . - r g ea r t r u e u n d \ quJ r e ds por . i b l e . T h e c r o \ \ - b I . l ( e \ r l eac h s lat ion s h o u l d f o r m p e r f e c t r e c I d n gle( . nol r l e w e d p a r a l l r 'l o g r r m s frrmer both \ iewed f r om th e 'i d c 'r d c , s hould be line d u p w i t h o n e a n o t h e r . Viewed f r om t h e t o p , t h e l o n g e r o n s br c ak s and f r a m e c r o s s - b r a c e ss h o u l d b e in t he s am e im a g i n a r y p l a n e s , c e n t e r e d on and per pen d i c u l a r t o t h e c e n t e r l i n e of t he f us elag e . l t i s d i f f i c u l t t o t r u e u p a

All Iramed up and ready for covering, rhe O.H Beaver is a modification of rhe B6ronian Beaver. See text lor mods.

fusel agebox frameal tcr i t i scomp let ely assembl ed,so you must check your progressat the addi ti onof each set of to makesurethe stru ct ur e cross-braces you are a:sembl i ngmatrhes the plan. \\ hen you dre srl i \l i ed w i th the f u. eadd the former sat l ageframeassembl y, tha forw ardsl ati on,and add the fo r m er at the i nstrumentpanell ocati on.Cover the front of the fusel agew i th 1/ . l2nd sheetbal sa. The nose cow l and the removable thrust button shoul d be conslr uct ed next. The cowl formersare all circular. S i zesare show n i n the si de an d t op vi ew s. The thrust button i s made of severall ayersof hardbal sa,and a plast ic thrust beari nBi s i nstal l edal i ts cenler . N ote that the cow l i ngformer i n which the thrustbutton fi tshasa squareholein i t to accommodate the button . The thrustbutton shoul dbe a snugfi t in t he nosecowl former. The cowl formersare w rapped w i th 1/32nd sheet balsa t o compl ete thc cow l . C ul the w i nR ri bs out of 1 l bl h . heel bal sa.l t i s probabl ybestto cut one r ib patternout of hardermateri aland , t hen use thi s pattern to gui de your blade w hi l e r utti ngout al l thc' e ri b..r. idcnt iP i nthe l ea< l i ng edget o cal l yaspossi bl e. the pl an, and usi ngthe ri bs as a guide, pi n I he l rJi l i nBcdS edor\n , ' \ er t h ( ' pl. rn ar e\J' tl ! l he ri ght di ' t.rnrc behr ndlhc l eadi ngcdge.N ow .r t mentr l l the r ib' in pl a,e. C emcnt the sparri n pl ,r,c in t he ri b nol ches. Continued on page 67

Thrâ&#x201A;Źe-quarterrear vi ew of skel â&#x201A;Źton fmmew ork. In thi s state it i s al most too pretty to cover!


s l i g h t a mo u n t a t the center secti on. C d re l u l l yc u t o tf i u\l l he overl appi ng Bostonian... - Continuedfrom page49 s o a r m a te ri a l , a n d then cement the re s u l ti n gs p a rj o i n tsbacktogether.R ub When th i s as s em bly is dry , c u t a some cement into the notches in the t t hewa yth ro u g h l e a d rn g.rn d tra i l i ngedge. of the w i ng n ar rown o tcha/ m os all the le a d i n ga nd t r ailing edg e s a t th e w h i c h s h o ul d b e c l osedup prettyw el l by . he d i h e o ra r n o w b e c a u s eo f the di hedralbreaks. d ihedra lb re a k loc at ions T N o w ro u g h -c u t the w i ng ti ps from breaki s l o ca te djus tat t he out s i d eo f th e . i ghtl ycementthemto t wo ce n te rmo srtibs .Nex t ,c ut th e s p a rs s o ftb a l s ab l o c k s L c lear th ro u g h at t he out s id e o f th e th e ti o ri b s ,a n d c arvethem to the exact c e nt e rmo sti ibs . Lif t t he s p a rsa b o v e s h a p e re q u i re d . Then, separatethem t hos eri b s (th e ys houldbend e n o u g hto fro m th e ri b s ,a n d hol l ow them out for . k e them as thi n as you l i ft e a c h l i g h tn e s s Ma , do t hi s wi th o u t br eak ing)and w in8 lrp to l he c olI e( l hei8 h l fo l l h e d e s i re ,a n d th e n cementthem back i n $ing di h e d rdlwhile leav inglh e c c n l e r p l a c ep e rm a n e n t l y. M a k eth e o u tl i neof the verti caltai lby p a nil o f th e wing pinned t o th e p l a n . l a mi n a ti n gth i n , b assw oodstri psto the T his wi l l ca u set he s par st o o v e rl a pa

shapeshow n.The outl i neon the mod el in the photoswasmadearounda curved l i ne of pi ns at approxi matel y1/4-i n ch i nterval sal ong the i nsi de of the tail outl i neon the pl an.W hen the outl i ner s dry, remove most of the pi ns, an d assembl ethe rest of the verti cal ta il di rectl yover the pl an. A ssembl ethe hori zontaltai l di rect ly over the pl an. Thi s structure i s ve r y simple and easy to construct, so no specialinstructionsare needed here. W hen al l the bal saassembl i es aredr y, usefi ne sandpaperto shapethe l eadi ng and trailing edgesto the correctcrosssection.Then, sandthe entire structure to remove any rough spots, and t o general l ysmoothup the \tructurepri or


EtiminatesGLITCHproblemsassociatedwith long servoleads. .

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Rubber pwd. cars- . Cont'd from p9.48

CVOS

Open cl assw ere a H ew l ett-P acka r d computerfor fi rst pl ace,fi fty dol l arsf or \'second, and tw enty-fi ve dol tars for . A \d dbr p,n 4 .ar s,ons w,r a. onne. r o .:t.l::: .. \- .f thi rd. l he H i gh S choolcl as.pri /e.w e r e sevent\-frredol l ar,'for l i rsl , l i fty dol ldr \ for second,and twenty-fivedollarsfor (Tw rn) ve GS _2 S 1 4 . 9 5 T wo Ch a n n e , lwo in d e p e n d e n tse r vo dr thi rd. N ow w i th pri zes l i ke these the S 1 7 9 5 - T wo Ch a n n e , two se r vo s p e r ch a n n e drl ve (Tw n Wve) GS _2Y entri es real l y got seri ous! H ow eve r , . O v e r a l le a d le n g lh r s a p p r o xim a te ly6 to 8' most entrantsw eren' t so S eri ousthal . M o d e le f m !st Iu r n r sho wn lo n g e r e xle n s ons as requrred they coul dn' t hel p each other. C o m add q ^ 6 .i r\, S1 0OSr ' r opr ncr dndHdndr r ngo' Pr p_Par dor de,s a r;,^ radeshi pw asvery much evi dentduring 6 o r or Calfor nr d r p"r dFnls. \,4asler ( lJ tgF and Vi s a the contest. 6175 PALOALTODR.,ANAHEIM,CALIF.92807 \714J637'2161 l he thi ng thal ImpIe\.edme w d\ ed(h per.ons approa< h to l he desi gnof h is w ere made ol w oo d, i ramer i ar. S ome d e c o ra ti o n sth a t you may w ant on the of metal -The w heels w ere made some i ndi m o d e l . l t' s e a s i erto add the l i nes pl yw ood, pl asl i c,me t al, made of w ere c a ti n B( o n l ro l s urface.w hi l e the fl vi ng from w ood t o .7532 decal w hi l e the ti res ranged S i mi l arl y, s u rfa c eas re u n a t tached. rubber tubsurgi cal i ncl udi ng rubber, n u m b e rs a re e a si er to appl y to the probl em ot sol ved the man i ng. One A s PAc ER ,o * fu s e l a g es i d e sa l t hi s poi nt al so. $15. 98 .{ how manvturnshi sw heel sw oul d ne ed C u t-th e l a n d i ng gedr tai ri nE . l rom bv starti nghi scar unw oundat the fi n ish N O S TAL GIA 1 i l 2 n d \h e e t b a l sa,and cementthem i n to t hestart l i n e, i t backw ards G A 5 M OO E Ip l a c eo n th e w i re. Make the tai l w heel l i ne.rol l i ne .,:: F R O M T HE 5 O' S turni ng thi w heel s a few mote tur ns, wire the balsa, and bend out of sheet then l etti ng i t do dow n the track fo r a I fro m a s tra i g h tp in and i nstal li t on the run. fu s e l a g eP . u t b a l saw heel . on l he mai n M A N U f A C T U RERS OT The w hol e meet w as run very w ell, g e a r, a n d re ta i n them w i th a drop of R U B B E R , GL ID ER,AND and the peopl ew ho ran i t get my thanks cementon the axle.Becarefulnot to get G A S F R E EF I IGT IT K IT S of ti mes,he r e for a good ti me.S peaki ng D T S T R T A U T ORAND a n y c e me n to n the w heel . are the resul tsof the day. D E A I - E R I N QUIRIES Cement the tail surfacesto the fuse- OPENCTASS INVITED. l a g e .L i g h tl yc e m e ntthe w i ng i n pl aceon (MPH) P IA C E N A ME SPEED the w i nR \truts and 1 . th e fu s e l a e eMake 16.756 JeffW i l son fi r rh e m i n -p l a c e.Thei r l ocai i onon the 2 Mark Ashby 14.765 w i n g i s i n d i c a te dby a smal l" X " on the 3 B i l l C ai ns 14.479 to coverrnS. th i rd ri b fro m th e center. 14.244 4 B i l l S troman B e n d th e m ain landing ge a r w i re to A seven-inchdiameterplasticpropelthe p a tte rnshownon t he pla n .C e me n t l e r i s c u t d o w n to si x i nchesfor the HtcHscHoor cr.Ass (MPH) SPEED P LA C E N A ME it in pl a cei n t he f us elage. B o s to n i a nB. e n d up the nosehook and -l Ray Stroman 15.064 wit h l i Sh l w e i Eh l Co ve r th e m odel i n s e rti t th ro u g ht he thrustbutton.A dd a 10.965 2 Kevin Miyake tissue.The color scheme can be anyof smallwashersbetweenit and As you may have noticed, my son t hing l h a t y ou des ir e. B e c a u s eth e couple p ro p e l l e r, and then bend tn a beat m) l i me by qui te a bi t ... gue'. it Beavir ha<been usedasa bush planetn th e w i n d i n g h o o k . I nstal l the w i ndshi el d w i l l be someti me beforeI hearthe e nd the Arctic,an Arcticschemewasusedon pi eceof of thi s.l t l ooksl i ke I' m goi ngto havet o t he lon g w i n gedbir d in t he p h o to s .T h e a n d th e w i n d o w s.A 1-3l 1b-i nch put l oR ethera fasl ercar by nerl March, p a n e l s 1 /1 6 th d i a me ter al umi num tubi nB i \ t ail su rfa ce sand t he wing ou te r i s nayw i l l be rn Open cl asiby then,and were covered with red tissue,and the used for the rear motor peg. A l o o p o f 3 /.l 5thsfl at rubberabout12 w e w i l l be i n the sameevent. restof the model wascoveredwith silver stamped Send me a self-addressed, t issu e Al . l ti ss uepanelss hou l dh a v eth e i n c h e sl o n g i s a bout ri ght for fi rst test grain o f th e c ov er ingm at e ri a la l i g n e d fl i g h ts .M a k e s u rethe ai rpl anebal an(ej envel opei f vou are i nl eresl edi n ' eeing year.B etteryel, wit h th e l o n ges tdim ens iono f th e p a rt. .i t l h e c e n l e ro f gravrty1C C )i ndi (dl ron. thi s racei n personnext you powerecl r rubber why not enter own The tissuecan be adheredto the balsa B d l l d 5 lth e m o d el i f ne<es< aryusi nB car? l ' l l try to getthe i nformati onbackt o s t ic kswi th thinned,whit eglu e .T h i n th e mo d e l i n gc l a v .T rv a l ew hand gl i de<to B i l lS troman,12218D une glLiewi th a t lea' t equal par t! o f w .rl e r ma k es u reth e model i l i esrea' onabl y.l f you i f possi bl e. . St.,Norwalk,CA 90650. t he trai l i ng edge of the i t s e p a ra te glue s ta l l s , on lv on th e o u tl i n e 5 0 ). L \e t his a5O add shi ms as fro m th e fu sel age, and w i n g W hen c o v e ri n g th e stru ct ur e. of t he s e re q u i re dto g e l d propel 8l i de. U \e l he mode l ,ma kes ur et he t is s ueo v e rl a p th Pylon.. ,. - -. Continuedfrom page39 s d mep ro c e d u reon the l eddrnBed8e i l edqe .e n o u ght o c orer all of t h e b a l ' a.o the gl i de. N ow , gi ve th e d i v e s rn n o t l e ft mo d e l thai th e e d g i ' of t he. ur f ac e 'a re u nf ini sh e das f ar a c olor ati o ni s c o n - th e m o d e l a b o u t50 handw i nds,and try usedas an after run oi l w hen you ha ve a s h o rt, p o w e re d fl i S ht. U se thrust fi ni shed fl yi ng for the day. Y ou c an cerned. A f te r th e c ov er ingadhes i v ei s th o r- adjustmentsto controlthe poweredpart make a good oi l by mi xi ng one par t o ughl y d ry, t he t is s ues hou l d b e w a te r o f th e fl i g h t, a n d gradual l yw ork up to Marval Mystery Oil and one part 20W shr u n k.th i s is bes tdone by v e ry l i g h tl y mo re a n d mo re turns i n the rubber non-detergentmotor oi l . N ext, you w i l l need a break-i npr op l o BSi n S a c pr . i\ of wdler a b o v e th e motor. T h e p l a s ti cp ropel l erand thrustbear- thatw i l l al l owyou to run I he engi nca l it . sur lare . l h e t i> s ue. houldge t d a m p ,b u t not re a l l ywet .T het is s uewil l s h ri n ka si t i n g fo r th i smo d el canbe obtai nedfrom maxi mumraci ngspeed,but at a ' fo ur Box 2498-MB,La Mesa, cycl e" ri ch setti ngto keep i t cool a nd d r ies, yi e l d i nga s m oot h, w ri n k l e fre e Peck-Polymers, w el l l ubri cated.To do thi qon a .40- . ir e surface.Next,givethe tissuetwo coatsof cA 92041. engi ne,you w i l l need to usea prop o ne from T h e w h eel s are avai l abl e balsa t hinn e d ,cl e ardope. Beforeassemblingthe surfacesto the " O l d T i m e rs ," Mi ke Mul l i gan,6031 i nch smal l eri n di ameterthan w i l r oe f use l a g e ,i t's a good idea t o a d d a n y C o rte zD r.,H u n t i ngtonB each,C 492647. used for raci ng, i .e. 9-5, 9-6.5, 9 - 7 .

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Bostonian beaver article&plan model builder september 1983