Control Line: Scale

Control Line Scale Bill Boss LAST MONTH covered some basics about models CG place belicrank also talked about importance balancing model before flight good basic step toward avoiding disaster maiden flight month will continue control system basics discussing some possible methods installing supporting required bellcrank lead-outs suppose number ofways lead-outs can installed will cover three four basic methods common ly used perhaps couple sophisticated methods Ill also touch rules respect use removable leadout guides As case last months column various questions Steve Tift Midland TX concerning CL Scale models control system again basis months column Lets start discussion lead-outs follow ing questions What purpose leadout lead-outs have held/supported special way order keep plane stable flight about rules respect using external removable guides hiding lead-outs entirely model has better appearance during static judging Beginning first question believe can simply state purpose lead-outs provide means attach models flying lines its bellcrank general placement lead-outs within particular model will depend plane being modeled high-wing low-wing mid-wing bi plane etc Usually installing leadouts effort made builder create straight-line path bellcrank through lead-outs flying lines control LOW WING-A LOW WING-B 111GM WING 0 BIPLANE Bill Boss continues talking about CL control systems month time hes going examine subject lead-out line guide placement Theres column handle smoothest possible control system operation obtain stable level flightattitude model both wing tips touching Charles Bauer Norridge IL entered PlUs Special CL Precision Scale event 85 Nats Craft spans 51 weighs 7 lb uses ST 60 power its appearance would enhanced lead-out guide wing strut nearest camera removable imaginary horizontal line viewed head position order obtain desired flight attitude control lead-outs must held supported some manner ator near inboard wing tip lead-outs secured inboard wingtip model would able yaw side-to-side able fly almost flight attitude liking sketch accompanying column shows several commonly-used meth ods installing lead-outs models low- mid-wing models two installation methods generally used represented accompanying sketch Low-Wing Low-Wing B Low-Wing has its bellcrank mounted core wing has its leadouts exiting lower surface wing near Continued page 163 North American T2J-1 Buckeye Navy jettralner isa ducted-fan model entered 83 Nats Dave Copeman Brown Deer WI Isa great example CL Scale models control system can completely hidden static judging purposes Access homemade belicrank L via removable cockpit module Note line connectors already attached belicrank hes readyto fly Dave merely attaches wingtip lead-out guide threads flying lines through guide connects directly belicrank Model made D&B kit uses K&B 75cc engineanother example converted RC kit flying CL September 1986 67 back spray wet coat tack coat im portant since undetected grease spots will accept provide surface wont make fisheyes wet coat applied light sanding No 400 paper used wet can followed second light coat color still transparent Another light wet-sanding will prepare surface trim colors Good masking supplies important stencils use Frisket paper available rolls art supply stores masking use Scotch 3M Fine Line Tape part No 021200 Neither material requires clear sealer Make stencil trim design thin poster board tape appropri ate surface trace design soft pencil Mask pencil lines spray trim color Lightly sand time remove ridges trim colors Add detail hearts desire spray mist coat followed im mediately wet coat Super-Poxy clear Twenty-four hours after applying clear polish plane Dupont polishing compound follow good paste wax couple days later Polishing early makes easier obtain buffed finish opposed normal wet look epoxy Waiting couple days before waxing allows epoxy cure completely secret system using same-brand materials paper base final top coat Compatability problems thus eliminated proper precautions namely good spray mask health hazards minimal system works Use confidence Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 CL Scale/Boss Continued page 67 fuselage Low-Wing B would have fuse lage-mounted belicrank lead-outs exiting fuselage above wings upper surface As can seen sketch both situations require some sort lead-out guides near wing tip effort obtain straight line belicrank flying handle mentioned earlier point might appropriate comment lead-out guide used should located respect inboard wingtip Lets assume talking about model has wingspan about 60 inches Experience practice has shown regard less lead-outs exit wing fuselage guide should located close possible wingtip case would say maximum about six inches wing tip have talked about normal practice using external lead-out guides alternative low-and mid-wing installation isin spite couple degrees dihedral wing might haveto put entire control system inside wing meth od have used successfully years low-wing models encountering flight problems does away need unsightly lead-out guides lead-out holes fuselage undersurface wing gives model much better appearance static judging Should use either lowwing methods B external lead-out guides keep mind Method would best-suited Precision Scale models room inside fuselage cockpit detail required Biplanes high-wing planes present unique problems isnt much can hide unsightly lead-outs guides sketch shows typical methods used case high-wing plane location bellcrank fuselage will determine long wing tip lead-out guides have lead-outs parallel bottom wing biplane best results achieved lead-out guide usually attached wing struts located somewhere between ance between wings measured upper surface lower wing cases have tried show sketch form examples typical types lead-out guides used Alongside Low-Wing sketch have shown possible method making removable guides can used low- mid- highwing models guide nothing screw drilled out accept piece formed piano wire nut lock place installed guide mount can made brass aluminum attached appropriate rib other location wing Next LowWing B sketch type lead-out guide can simply piece 1/8-in plywood affixed appropriate rib made removable shown removable appropriate mount will have provided guide shown alongside high-wing sketch simply made bending/forming piano wire attaching rib near tip wing biplane lead-out guide generally made apiece plywood apiece sheet aluminum attached struts between upper lower wings As case low-wing guide examples high-wing biplane guides could also made removable thus providing better model appearance static judging course ultimate alternative methods types planes little ingenuity design removable lead-out guides means connecting flying lines directly belicrank Such case Dave Copemans North American T2J-1 Buck eye 83 Nats Dave could after removing cockpit module model connect flying lines directly belicrank via removable guide wingtip setup certainly allowed model displayed its best static judging would seem little planning some extra effort almost types CL Scale models could made have nonshowing control systems Certainly models WViI II fighters bombers could have attach able line guides removable wing panels line connections could made Biplanes high-wing planes could also have removable line guides perhaps well-executed remov able panel models fuselage behind flexible lead-outs could coiled stored until ready flight object able present model static judging encumbered unsightly lead-out wires However before rushing off incorporate ideas latest creation aware following Unlike RC Scale events contestant allowed rules add antenna model no provision current Control Line rules allows anything added changed model after static judging except propeller spinner flying purposes interpret include removable line guides addition line guide has rarely contested point out possible source trouble plan see area concern addressed during present rules-making cycle submitting rulesSeptember 1986 163 Name Street Address City State Zip CLEVELANDS GI NTSII MANY NEW FOR R/C BUFFS Denignod Bode Meeter Flying Model Following Beilt-Up Prototype Practice Wood end Pebne II Repliee Reeihiere thee Th,o hi New Historical P eg ted 87 Coct JN4 Jeney537 81 D$4 84 Fokkoe 07 Ftc$39 108 70 Beylec Gee-Bee$32 98 S 60 Hoceed Pete Rece535 99 N 60 Seperreorine 068$24 71 0 89 Scpecroeine 068$35T 95 0 63Cert Heeck P60$42 868 94Cet Beech P-6E$54764 S 74 Deelittlee GB 11$48r72 C 95 Mcnecccpe Sport$36 108 80 Bell Spc Belideg $43 60 Oceglec M-2 Ideri $24 -107 Anecece C-3 Spt 03568 8rceel Beildeg Fee $30 62 Hececed tee Ike $45 59 ficecetece MeLA $54 78 Tocree WW Roe $35- 107 Gre, fleecer PBF $54 63 Cer Geelek Pt tC $42 69 Lndbeegc NO-St 1 $58 94Cc Cockle P1CC $54 91 Lcedkegc NX-21 1 $39 66 Del-Icc Cereet Roe $24 96 WeNWiNce tee $48 62 HoecMMelIgen $35 74 C teIIdc 0B2C-4 855 94 HcecMcMelIigon S45 108 FoiekPT-19 0 $59 63 fleeing P-26A Pt $36 60 Wece Topec-Wieg $36 84 ROein8 P-26A Pee 84890 Weec Tepec-Wieg $48~i O4WeeO C6 CoMe $05 75 Weceld Lyceede $32. 64 Beech C17-8 Stog $30 100 WectIdLyender $49 e 96 Beeeh C17-B Steg $49 57 Feed TeicrI 4-AT $36 * eek 11 Eleetre 830 76 Peed Trierlr 4-AT $48 02 Leek Eleeero $40 114 Pc4 Tejece 4-AT $65 Seiecoe 1/W $87 $18 96 Bellonee Aeee $40 81 Stinsee T/W 087 826 93 teeecg C-2Aeeph $69 122 Selecen 01W 097 $38 50 Gee,- is-P Deck $39 59 Brierel Pt P2-B $20 78 Gre, J2P Deck $56 118 teistol Pt PSOB 54$4 124 Leek Ale Eepeece $48 74 Tecceec Pecce $4$4 62 tech Al Peprece $24 56Cc Weclek P40 $24 83 Leek Ale Eepcetc $26 60 Vegc Ceccoic P40 $35 77 WWcc 121 9edL $48 $0 Vege Coceci P4$ $69 63 C Seekeeck FTC-i 545 78 Lock Lighteg P38 $38 04 C Seekoeck PlC-i epSeoBee Ac $24 108 Sikee 0-08 Acph $49 - 74 RepSec-Bee Ac $39 6$ Beeleeg 10$ Spece $361 70 Flee J-3 Ceb$29 90 Beecc 100 Spere $49 106 Flee i-S Cek53975 Necehcep Geccce $40 98 Leek Hedeec Beck $38 96 Necelccee Geccece $75 63Gecn P6F Helleee$St 90S ece LecS M856 77 Beelee Bt7G Feet 835 405 c Ic S M$45 Bee B-17G Peer 855 150 Se ccA [eec S MOOS eclI Whieleeled $32 78 Ceecel Ce POYSA $42 69 N Acee Neciec 859 104Cc Cc PRYSA $56 68 B8e-ccee V-Tell $29 65 M Ch cc C ppe 060 77 Leceerche Sedee $25 O7MChce C FFe $7 72 NA B-SO Becekee $49 CT Ce Ccc NC 4 $09 65 Motereedee 8-26 $49 94 Ce cc NC 4 $69 tetcceccee-ectcececreeeAcre Ocee 200 OrIeec 6 3 Fe c cc SOc Up Add 10% CecIl edec fee chipp cc & cc etc Co USACoc&Meetlceccheeitc S 25 fleyc Ficteriol eceoleg 0200 liccledec F ce L c P cc cc ceetien dec $100 fleer ole feegee cdd $100 LEVELAND MODEL&SUPPLY Co EeWcetrccectecerctce-c C 18300K 0808010 AVE CLEY LA 44 Phecreeree ceecc cr050 APPLIED DESIGN CORPORATION 738 Penn St El Segundo CA 90245 MINI ER ADJUSTABLE TENSION HAND BELT SANDER FIRMLY HOLDS PAPER FOR EASIER SANDING Padded 11018 COd CUFYSS Handy Ia Hold o Easy lB Use $2f5 MINI-STRIPS PRECISION DIE-CUT Medium Garnel SAVES TIMEREPLACEMENTFine Dorsal AND EFFORT $165SANDING BELTSAssId Waler Preal TEE ALUMINUM EXTRUSION SANDING BLOCK hr use wAll RUFF-STUFF SeA-adhesIve sond paper uirge True Surloce Weal Wear 001 11 Inch $21 Handy Ia Un22 inch $375 RUFF F SELF ADHESIVE SHEET SANDPAPER MAKE YOUR OWN SPECIAL SANDING SHAPES Easy IC Use No meaiy glue drying lime Flea PUS MINL SAW $791 COMPACT 10 inch HACK SAW SAWS ANYTHING ANYWHERE Saw 11a8 rugged di caBI Iranie wIlh camlorlolde chip-pinel plaslic le nefl hoadle Receding ieee ofid ad 1031*10 B blade gIveS Bead wan access Cub weed plolk welal end HARDENED MUSIC WIRE e00r6 hlades-3I5199 change proposal Please send PhOtOSc building tIPSc con test reports items CL Scale Bill Boss 77096 269th Stc New Hyde Park NY 11040 CL Carrier/Perry Continued page 69 hardwood block length dowel fuselage sheeting pivot bearing hook inserted through reinforcement retained wheel collar Although tall hook need retracted high-speed portion flight reduces drag avoids possibility tail hook will catch uneven joint deck takeoff common release uses Down elevator movement pushrod release tail hook latch pin usually As-in music wire often attached pushrod passes through loop attached tail hook Down elevator movement pulls pin retaining loop allows hook fall An alternative favored some use low throttle movement release tall hook Such arrangement requires additional wire tail does allow engine idled before takeoff should desire tail hook release mechanism SH Ringots Wildcat puts no tension pushrod hook retracted adjustable point release also can built force required release tail hook stronger force exerted latch weight elevator way hook less likely released accidentally after engine started Another feature hook released accidentally can latched up again simply raising retracted position also can latch itself up landing under right condi dons two methods holding tail hook down rubberband tension spring Kingfisher photos torsion spring Wildcat tension system can built hooks rubberbands nearly line up pivot point hook retracted reduces force latch mechanism increases springs lever arm tail hook extends method prefer Whatever method used force tail hook should strong enough prevent hook bouncing excessively landing yet strong prevent tail settling deck model placed gently its landing gear hook extended tail hook should extend no 60e horixontal 45c 3O probably better 60e extension can allow tail hook hold tail air unless spring tension reduced point hook will bounce excessively hook portion should shaped tail hook will catch hold arresting line both extended position model resting its landing gear positive down-stop should provided control extended position tail hook screw dowel block wood will serve ade quately Kingfisher uses piece steel cable control line between tail skid small loop end hook limit travel Wildcat relies torsion spring control extended position hook Richard L Perry Model Aviation 1810 Samuel Morse Dr Reston VA 22090 I When responding advertisers mention read about ModelAviation CL Ki-61/Felton Continued page 74 triangular balsa bracing Glue Cl right side fuselage dry glue left side fuselage Cl Attach fuel tank -in ply support fuel tank may attached support rubberbands Make pushrod /$2 wire -in sq spruce attach bellcrank along lead-out wires Install tank bellcrank assemblies gluing ply supports cardboard supports sides fuselage Glue fuselage sides together tail Glue Fl F2 place cover top fuselage sure bring fuel tubing fill overflow lines out during covering operations Cover bottom fuselage F3 through F6 Add Bulkheads through D top fuselage Cover bulkheads Dl has scored folded Add Bulkheads Dl E El F G top fuselage cover D2 Add remaining bulkheads H J top fuselage cover D3 Add three K bulkheads forward bottom fuselage cover D4 cowl made hollowed-out balsa block top half consists hollow block /$6 ply C4 glued front Drill hole C4 install blind nut back side before gluing balsa block glue block firewall removable bottom half cowl consists C2 hollow block C3 holes C2 must align Y32 dowels Firewall Cl aligned glue C2 back face hollow block hole C3 must align hole C4 top block aligned glue C3 front face lower block Sand carve hollow cowl block shape Test-fit engine cowl drill mounting holes KM-40 mount Use shaft extension give adequate spinner clearance Cut holes cowl block cylinder head exhaust needle valve Glue stabilizer fuselage Glue fin fuselage add balsa blocks side fin Sand blocks match fuselage contour Glue rud der fm trailing edge offset outside flying circle Make tail wheel 3/$z-in wire Bend shown place -in ply support wrap nylon thread smear glue dry glue place bottom fuselage cutout Make main gear %2-in wire shown Make gear fairings -in ply attach gear nylon gear clips Attach gear assemblies -in ply supports bottom wing nylon gear clips Make air sccop /$2 balsa glue bottom wing Finishing Paint trim model before final assembly overall model medi 164Model Aviation Add 20% postage Send 25 catalog