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Misgwided ilIissile

THI ' . l ( l ; . arc. general ly speaki | |g. r \o tv les oII cl ,0' L el i ,L.r, f i tst ly thc spofls type, usuall \ '

found in kits, \vhich possess a reasoDable glide butlarely the high cliDrb Deeded fo! contest 1vork, andthe contest type u'here the glide is olten not rDuchirnproved but more altitude is gaired on thc cIi b.'fhis nrodel is of the latter type.

Design follorvs aerodynal)ically on powcr duta-tion lincs. l'o stop loopiDg rrrdet power (of thclaunch) the C.G, is moved as far aft as possiblewithout the rrodel diving i1l if it gets its nose do\4'n.Pol)'hedral is used to give a rapid roll out of thecnd of the cl ir)rb. Thc f iD is placed uDderDeath foraerodynarnic reasons and :tlso to raise the C-G.stightly i4 thc invertcd positjon. From the struc-tural point of vielv tle Juselage shape ancl rvingposit i(D \1i l l be notcd as unusual, the shape beingadoptcd to temove three iDherent lvcak poirlts onnomral chuck glidcr fuselages. Thcse points areunder the rving, just alt oJ the trailing edge, an(liust ahead of the tailplanc. The wing positiongives a vast anaL neccssar)' iicrease ilr the strengthoJ the \\-ing seat.

Construction. Tlris Jollorvs norrual practice butthe Iollorving poinls Dra)' l)c helplul. Iirst notethat selcction of good (not hard) 1\'ood is essential.I put the dihedral brealis in as follows. The 1\-ilrgis scorcd on the top sur{ace rvith a hard petrcil andthen cut halJ \ya! through fron tlle bottolD. ,\sttaight edge is ne\t placed on top oJ thc Niirglevel with thc breali on the plan. 'l'he free end oI

lohn Borker introduces you to contest

chuck gliders by woy of this high

Performance 18 inch model.

tho wing is then pulled up to the dihedral. Thecrack thus foII ed is liberally sr)rcared top andbottonr lvith Britlix. The dihedral sLould bechecked during drying as the cernent rvill dra',v as1t ctrles,

Sevelal coats of cement should be aDplied to alljo ints. Tlrc strai3ht leading edge is ; ra in ia inedalmost out to the tip to allow a cellulose tapeleadiDg edge to be afiixed iJ desired. I do not thinkthat the super finishes olten recorrrmended forchuch gliders are worth rvhile and only add rveight.

CHUCK GLIDING lN B.C. 2.49. Ogg tesrs his Leopard-skinSpecial

AEA@M@DBIMB

However, if your x'ood is very soft a thin coat oldope will harden the sudace, sanding afterwardsof course.

Please do not stick lurnps oJ clay round the noseor rivet chunks o{ lead in holes for the nose weieht !I t js 'nearly as easy r o f i t i t in f l ush with the fuseiage,is neater, and doesn't knock off and spoil the tdm.

Trirnrnin€, and Flying. Note ! Instructionsgiven are for right hand chuckers; Ieit handthro$'ers should alter the fiI1ger grip to the otherwing and follow instructions looking in a mirror ITrim for glide with the C.G. between the positionshewn and half inch ih Jront, U possible, tdm for

t70 March, 1953

tum with lelt rudder only lor a start, This onecontrol will cause less confusion and allow you toleach a leliable trim sooner. From this point,reaching optimum trim usually consists of tighten-ing the glide circle while still maintaining a rapidclimb without too much turn. At this Doint voucan lry al l lbe warping tecbniques y6u knbw.Howeve!, do not {orget that warping a big tailplanelike this on one side oDly car give a strong aileronefiect, e.9., if you warp down the trailing edge ofthe tailDlane on one side to stoo a stall and if ithappens to be on the inside o{ the turn, you rnayfind that it merelv decreases the turn and stallsthe model further.-

There are several difierent flight patterns whichcan be tried, but the two most used are :-First,a launch in a steep right bank is followed by aright spiral climb; the spial widens as the powerdies until the model is circling left on its dowlrwardglide. Second, the model is thrown almost straightahead aDd upwards with a slight right bank; themodel climbs almost straisht and flick rolls at theend into i ts gl id ing al t i lude. This is the methodI favour at the moment.

For launching I recomrnentl the grip shewn inthe photograph, although the grip with a fingerbehind each trailing edge can also be used. In thelatter case another finger grip stiengthener will berequired. The old method of merely grasping thefuselage between finger and thumb does not givesuch powerful or consistent resDlts

JOE FOSTERS AMERICAN RECORO XOLDER.rt{oooR H^No L^!i€H.D

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