Control Line: Scale

HOW TO SET UP operate electronic con trol system CL Scale models Part Two months topic Last month provided some basic information operation twochannel system used flaps gear retraction So far have covered encoder two types put control devices wiring assembly control box can attached threeline control handle month Ill discuss decoder mod ification will permit accept encoder output order properly operate servos decoder used project digital pro portional RX decoder Ace R/C Last months encoder board also Ace de coder has output operation positive pulse servos can ordered either kit form factory-wired unit latter has wiring seven channels battery supply leads leads would normally have connected receiver section RC system chose prewired version project since would less chance wiring error trouble decoder modification sketch shows de coder board layout before after modifica tion before sketch shows board would received Ace except set channel leads shown sake sim plicity Also please note numbers 1 through 8 adjacent IC2 74C 164 diagram denote channel numbers rather terminal connection numbers IC after sketch course shows board after modification board modified removing first transistor capacitor resistor designated circled X before sketch red receiver lead black receiver lead re mains place white receiver lead re moved its original location reinstalled bottom left hole vacated removal resistor white black leads now beFred Cronenwetts F4U-1A Corsair placed third Sport Scale 7th annual Seebre Memorial CL contest California Cor sair has two-line belicrank system one-channel electronic control system throttle uses servo driver unit February 1991 55 Control Line Scale Bill Boss 77-06 269th Saset New Hyde Park NY 1040 Ace R/C digital proportional RX decoder shown before after modification use Aces generic 7-channel encoder Theres coiumn system CL modeis Modified Ace decoder its piastic case its equipped four-channei operation Ace Ban tam servos used Deans connectors painted white side error-free assembiy come signal input leads decoder will eventually attached control lines bare wire strap remains place decoder must modified can properly process output encoder Sim Continued page 1 7S Merle Morhings 13-lb B-17F Royal Don Hutchinson flew PT-i 7 fourth- kit placed second Sport Scale place finish Sport Scale well-crafted point behind Grant Heistands Beech Baron cowling dummy engine good job pictured last months column Merles hiding operating engine Since lacks airplane features multichannel electronic throttle control Hutchinsons plane loses control systemflaps revolving turrets points judged flight realism throttle retractable landing gear Using talcum powder filling material dope has around long time remem ber hearing vague references talc dope fill ers far back early Fifties Later some East Coast fliers gave us detailed propor tions modelers myself included still using same technique today base sealer begins equal quantities 4 oz clear thinnerin dark color like blueand talc Dissolve talc thinner add remaining ingredients consis tency will probably serve well brushing requires thinning spraying like spraying since produces nice base brushing works well too Caution material quite heavy youll need sand off Thats dark color helpful sand away filler color highlights low spots Block sand until youve removed colored filler except dings grainy areas sand down sur face recoat sealer resand Re peat necessary until base perfect Thoroughly clean entire plane Prep sol equivalent continue fin ishing procedure Youll probably want give plane coat clear dope point seal filler Now less commonly known use tal cum powder Its helpful youre drawing ink lines Quite often though surface clean aiid free fingerprints youll have areas simply wont accept ink Sometimes re tracing lines will trickbut run risk indenting surface doing better way dust surface talc wipe off significant residue ink lines works like magic youve finished inking wipe plane Prep-sol remove talc Actually can spray right over talc will disappear I] CL Scale/Boss Continued page 55 ply described modification necessary because signal generated encoder passed over control lines series wave forms synchronization pulses certain shape polarity Upon receiving pulses modified de IGLOWUG DESIGNED Puts ma e St ng n engine FOR LONGER HIGHER RPMS Get starts GloBee Unique flat-wound spiral coil element anc high temperature glass-to-metal seal add up faster ignition increased RPM GloBee plugs specified original engine manufacturers purchased over over again Pylon control line racers find GloBee plugs best GloBee plugs designed fit popular engines used today unavailable locally write call Twinn-K collect pricing & delivery information & FREE Catalog MAKE THE GLOBEE / INDY CONNECTION Twinn-K Inc 10296 W Washington St Indianapolis IN 46231 Telephone 317-839-6579 FAX 317-839-8928 coder passes through series inverters contained IC-i finally onto IC-2 further processes synchronizes pulse train provide positive output pulse required op erate servo did remove transistor encoder output would pass through extra stage would reverse pulse polarity time too servos would operate Channel wiring prewired decoder used seven channels wired close examina tion wiring will show output leads channels 1 3 4 odd-colored wire grouped together have common set red k - battery leads grouping intended terminate Deans connector block channels 2 4 through 7 would terminated individual female three-pin Deans connectors wiring setup intended use receiver can use same wiring arrange ment wish build system four working channels some reason channels individually wired red black battery supply leads would have wired channels 3 4 Spare holes pur pose can found dotted line areas marked B area marked C contains spare holes isolated rest circuitry thus no use us project modified decoder used project shown photos Note leads channels 5 through 7 have removed Battery supply leads intended channels used individually wire channels 1 through 4 channels 1 2 used proj ect channels 3 4 wired use future project will have four operating features Pictured Aces R/C Commander Bantam servos other servos used sure con nectors compatible Otherwise will have change connectors either servo de coder channel leads soldering servo connectors remember red lead pos itive side battery black lead neg ative side odd-colored lead servo signal lead System operation control adjustment Before continuing lets briefly examine encoder control circuitry system operation op erational theory too complex general explanation youll need some basic knowledge order properly adjust input controls As noted last months column input con trols two basic types 1 switch operation 2 AUX/LEVER variable resistor inFebruary 1991 175 PINSPATCHES i2U~Q rngLim C0 CUSTOM ENAMEL PINS & EMBROIDERED PATCHES MADE TO YOUR DESIGN 303 667-4940 P0 Box 1615Loveland CO80539 RAINBOW RUNNER r 45 Gm PRECISION PROILJCTS IN. 714 592-5144 510 E Arrow Highway San Dimas CA 91773 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries AU chargers need padageI Fits48V Ax andpacksPlus $5 SEtH GO~For Cycler-Chargec$23995 eeceeGelled Cell TrIckIer#IC~ *Regular Model- $4896 ForPlus $3 SEtH~iaC4For field kit smallPlus $3 SEtH MufteO%electric boat batteriesSpecify 612 24V Heavy Duty Model$5895 sport winch large boat andPlus $4 SEtH electric power charging batteriesSpecify 6 2v CaRa Products5A5EiVn PO Box 221 605-987-5924Dealer inquiries inviledcanton SD 57013 PROPELLER SAFETY MESSAGE safety precautions designed enhance enjoyment model flying should part modelers routine both flying site workshop 1 Select correct propeller size following engine manufacutrers recommendations 2 Before using plastic props remove flash along edges propeller scraping pocket knife 3 Install propeller using correct nut washer airfoil side forward securely tighten Recheck after flight 4 Use chicken stick electric starter start engine make adjustments behind engine 5 Keep spectators least 20 feet away out path rotating propeller 6 Wear safety glasses hand protection operating model engines permit objects touch turning propeller Remain clear propeller arc 7 To stop engine cut off fuel supply accordance manufacturers instruc tions case DO NOT stop propeller hand other object 8 Inspect propeller after flight Discard propeller has nicks scratches other visible defect DO NOT repair alter orin way modify propeller 9 We strongly suggest propeller tips painted order increase visibility turning rotating propeller can cause serious personal injury FOLLOW THESE INSTRUCTIONS CAREFULLY WINDSOR PROPELLER CO 3219 Manier Cr Rancho Cordova CA 95742 should adjusted about 25k ohms about center position connected shown encoder wiring sketch switch unit will provide on/off operation channel keep within its prescribed time period Once entire system set up find single servo noisy buzzes jitters recheck input device settings okay check whether servo properly centered isnt refer manufacturers instructions adjust servos centering Next month Ill conclude discussion overall system connections insulated lines wir ing planes battery supply way sulating line clips Heres listing Ace R/C parts used portion project digital proportional RX decoder #12G15C $1895 plastic decoder box #PLA2Ol $2 Deans connectors three-pin sets @ $175 per set and/or three-pin Deans con nector block #19K22 two Bantam servos #14G26B $2645 Approximate cost decoder assembly two channels $85 $90 including miscellaneous wire solder batteries Please send ideas notice upcoming CL Scale events contest reports especially photos CL Scale activity address very top column cremental control Before can adjust con trols must understand something about movement affects particular channel encoder input encoder capable seven-channel opera tion purposes explanation tets assume seven channels will made operational achieve creating channel-tochannel interference encoder must able read control channel independently sequentially Lets imagine time line channels has predetermined space equivalent time two milliseconds ins Lets further imagine during specific portion 2-ms time period channel operationat sensi tive input control movement operational time period can defined 15-ms point 05 ins overall time per channel objective control vary through use input devices voltage input channel during its operational period two devices using switch AUX/LEVER allow us control channels two modes switch unit instantaneously shortens lengthens op erational time period 15-ms point 1-ms 2-ms point on/off-type control channel other hand AUX/LEVER variable resistor allows us control channel continuous incremental manner between 1-ms 2-ms points its operational time period properly adjusted AUX/LEVER unit 5000-ohm 5k variable resistor will al low us continuously control channel ad just unit put lever its center position measure resistance center termi nal outside terminals ohmmeter should measure about 25k ohms either side side gives higher reading other adjust turn U-shaped device back unit until both sides measure about 25k ohms now move lever side other resistance reading center ter minal outside terminal should have range about about 15k ohms connected encoder resistance range will keep varia tion input voltage range permits contin uous operation channel well within 1ms 2-ms time period input voltage ex ceeded range making channel operational longer 2ms possible spillover other channels time period could cause loss synchronization encoder As result ser vos connected system could become noisy jitter possibly run free switch input unit has two 5k-ohm trim pots BD-4/De Loach Continued page 61 sufficiently challenging task preclude rec ommending first model fact BD-4 boxy anyway makes natu rally easy build Further has scaled directly Bill Hannans threeview can sure true Scale model can competitive contest indoors out Begin construction building two identical fuselage sides directly over plan Beginners Remember layer plan Saran Wrap wax paper first prevent glue sticking structure plan important choose glue wisely almost models con struction lightest strongest selec tion has given great success Tite bond Elmers wood glue though Am broid Duco would probably job oft THE FIRST PRECISION-ENGINEERED ENGINE MOUNT e THAT PROVIDES VIBRATION-DAMPING SOFT MOUNTING uSA IViounI WITHOUT EXCESSIVE ENGINE SHAKE AT ~M e n very soft mounting excessive engine shake low RPM due damped nonlinear force-displacement characteristics mounting system vibration mounts loaded compression shear Thwat forces cant causetensiOn failures constructed aluminum oil resistant tomer Safety featureunique mount design captures engins airframe ught weighte55 standard aluminum hard mount Allows lighter front end construction Radial beam mounts available 40-65 7011 12-18 cu sizes hardware complete installation instructions included 60-day norisk money-back guarantee direct orders Radial Meant21Y5 23Y4055 zepI,ewo 701155524w 7011 ize 52555121 5 size 52505 121SSZO 53155 oflware10319 Pine Pass Drive Houston TX ssociates Viso MsslerCard COD ac55pted Dwtor isqoirse ovtcwsr 01 Asoorn15e 176 Model Aviation b lln