UEloy Marez L7JG@ cKLiiz1z7~ Welcome Model Aviations bimonthly electronics column Wait dont go away electronics slightly complicated nature basics simple can explained common terms Such will main goal remove some mystery associated electronics modeling doing ensure getting utmost efficiency reliability sometimes-expensive equipment However will column because am punching keys word processor Otherwise think meeting place similar flying field discuss what works what doesnt ask questions dont claim know will never have enough time try everything have sources can probably come up whatever information needed mail will answered directly SASE please though letters general interest will included future columns qualifications AMA member number 1995an original issue got first RC Radio Control airplane Macs Robot 1953 1954 Now Im limited sport flying Im real buildercut glue shape sand cover paint etc also electronics columnist Model Builder about 15 years retired US Air Force after 24 years flight radio operator Ham licenses number countries have worked RC industry since early days being technician up flying LSD USAF nomenclature Large Steel Desk Costs discussions RC fliers around country often hear gripes about expensive hobby isespecially radio equipment first commercially made radio cost 700 late-1960s dollars can buy five-channel computer system commonly required mixers double conversion narrow-band receiver four excellent servos name-brand Ni-Cds charger assembled using latest surface-mount technology around $200 shouldnt complain Surface Mount Technology SMT Electronic equipment construction methods have changed drastically recent years more-reliable faster assembly methods developed SMT adopted RC industry RC masses really started development transistor received major boost Integrated Circuit IC came along dedicated circuitry containing sometimes hundreds transistors related components device no larger match head IC know actually packaged can handled properly simplify required connections earliest days everything built using older leadmounted components ICs made smaller lighter reliable equipment possible theyalong other related componentsrequired mounting surface called printed circuit PC board very small holes accurately drilled accept wire leads Enter SMT components including valuable ICs no longer have leads have small feet soldered pads PC board Equally important everything shrunkin cases less half size older leaded componentsand weight went down significantly components designed SMT assembly referred Surface Mount Devices SMD assembly some cases testing done robotic equipment eliminating Monday morning assembly problems past Servos theory people like discuss servos because part system has life can see movement rest RC system part mystery talking about Servos come some sort rubber grommet brass eyelet through screwed down servo tray wooden mounts often instructions clear theyre ignored eyelets installed top should go bottom up installed top sharp bottom edge eyelet will dig whatever being screwed toespecially wood screw can tightened much grommet squeezed past point can provide vibration isolation intended first place As electronic equipment servos prefer work under vibration wide lip eyelet installed bottom prevents digging mount actually limits amount grommet can compressed screws used mount servos critical some degree dont like use wood screws sheet-metal screws because Murphys Law something can go wrong will can vibrate loose go check yours using especially remove servos reason times screw goes out loose becomes prefer threaded holes 3-48 machine screw perfect fit brass eyelets threading holes plastic wooden mount vibration will get screws can take servos out want being loose reinstalled threading wood once run drop thin CyA cyanoacrylate glue hole Let dry thoroughly run tap through once again way have hardened thread will last almost long plastic #3 proper type screw no matter what type screw use #2 too little Probably significantly us claim need voltage regulator five-cell packs Since can tell difference servo operation voltage drops two-hundredths volt 013March 1999 91 Wire harness end servo case can present problems mounting Wires side convenient some cases PUT ON SOME AIRS Sport-Airs TFOIA-Airs m A~NE W N NUU5WNN~ ~7 RO Box 208 Methuen MA 01844 phone 978 686-0319 Visa Mastercard Welcome Call write full line catalog mga pilots po box 5631 fresno ca 93755 tel 559 224-4170 fax 559 224-2789 wwwprofitscapecomlbetalmga/ inch slop results using No 2 screws must unacceptable Getting screw holes proper place important Its problem use predrilled plastic mounts can use wood might have seen ads Great Planes Dead Center Engine Mount Hole Locator DCEMHL got two airplanes ago best $899 have spent long time DCEMHL does perfect job locating holes engine mount much less time measure twice drill once method evolved DCEMHL also does perfect job locating mounting holes servos Just sure grommets inserted properly temporarily insert eyelets top use DCEMHL instructed locate engine holes Drill tap holes servos will mount distortion pulling grommets Dont forget reinstall eyelets bottom have ever mounted servos way other plastic trays might know wire sticking out end can problem have make some sort groove cutout clear sometimes weakens mounting structure Attention radio manufacturers would help wire came out side some cases can make cases mentioned earlier cant try everything cannot check 111 servos available see wire can made come out side servo However takes some servos cutting slot side case maybe bottom similar slots end rerouting wire some maybes Some servos have wires attached bottom PC board other servos have top Someespecially miniservos microservoswill probably have room wire other path originally created standard-size servos did try Airtronics 102 & 322 Futaba 148 Hitec 300 Tower TS-53 easily changed caution 148 might apply other cases PC board combination through hole SMT has pointed wire ends sticking up board path might want reroute wiring Trim wire points flush hoard Otherwise pressure bottom cover might cause ends puncture wires insulation disastrous results piece thin acetate sheet inserted under wires would desirable Till next time 73 Best Regards Hams say Remember have input regarding direction effort will take write let know rel 2M has very popular introduction back 1993 larger version wonderful flying sail Kestrel 100 its larger span hinh greater performance its little increase wings speed wingloading planform breakthrough sailplane 92 Model Aviation r 20 $5795 Train-Air 40 S 7295 - $6195 $7795 a11 Introduces Special Also av K RE wingspan ioo wing area 935 sq weight 46 oz wingloading 65 oz/sq ft Airfoil 507084/7080 Skill level Nov/Nov Radio standard reteiver 2-3 servos 550 mab battery patk N mers ie so pen rate L/D fa Wingspan 78 ight 36 oz Airfoil 0 standard its NSP Northeast S usedProducts iother16 Kirby Lane 14 h t tp 11w w w ii corn
Edition: Model Aviation - 1999/03
Page Numbers: 91, 92
Edition: Model Aviation - 1999/03
Page Numbers: 91, 92
UEloy Marez L7JG@ cKLiiz1z7~ Welcome Model Aviations bimonthly electronics column Wait dont go away electronics slightly complicated nature basics simple can explained common terms Such will main goal remove some mystery associated electronics modeling doing ensure getting utmost efficiency reliability sometimes-expensive equipment However will column because am punching keys word processor Otherwise think meeting place similar flying field discuss what works what doesnt ask questions dont claim know will never have enough time try everything have sources can probably come up whatever information needed mail will answered directly SASE please though letters general interest will included future columns qualifications AMA member number 1995an original issue got first RC Radio Control airplane Macs Robot 1953 1954 Now Im limited sport flying Im real buildercut glue shape sand cover paint etc also electronics columnist Model Builder about 15 years retired US Air Force after 24 years flight radio operator Ham licenses number countries have worked RC industry since early days being technician up flying LSD USAF nomenclature Large Steel Desk Costs discussions RC fliers around country often hear gripes about expensive hobby isespecially radio equipment first commercially made radio cost 700 late-1960s dollars can buy five-channel computer system commonly required mixers double conversion narrow-band receiver four excellent servos name-brand Ni-Cds charger assembled using latest surface-mount technology around $200 shouldnt complain Surface Mount Technology SMT Electronic equipment construction methods have changed drastically recent years more-reliable faster assembly methods developed SMT adopted RC industry RC masses really started development transistor received major boost Integrated Circuit IC came along dedicated circuitry containing sometimes hundreds transistors related components device no larger match head IC know actually packaged can handled properly simplify required connections earliest days everything built using older leadmounted components ICs made smaller lighter reliable equipment possible theyalong other related componentsrequired mounting surface called printed circuit PC board very small holes accurately drilled accept wire leads Enter SMT components including valuable ICs no longer have leads have small feet soldered pads PC board Equally important everything shrunkin cases less half size older leaded componentsand weight went down significantly components designed SMT assembly referred Surface Mount Devices SMD assembly some cases testing done robotic equipment eliminating Monday morning assembly problems past Servos theory people like discuss servos because part system has life can see movement rest RC system part mystery talking about Servos come some sort rubber grommet brass eyelet through screwed down servo tray wooden mounts often instructions clear theyre ignored eyelets installed top should go bottom up installed top sharp bottom edge eyelet will dig whatever being screwed toespecially wood screw can tightened much grommet squeezed past point can provide vibration isolation intended first place As electronic equipment servos prefer work under vibration wide lip eyelet installed bottom prevents digging mount actually limits amount grommet can compressed screws used mount servos critical some degree dont like use wood screws sheet-metal screws because Murphys Law something can go wrong will can vibrate loose go check yours using especially remove servos reason times screw goes out loose becomes prefer threaded holes 3-48 machine screw perfect fit brass eyelets threading holes plastic wooden mount vibration will get screws can take servos out want being loose reinstalled threading wood once run drop thin CyA cyanoacrylate glue hole Let dry thoroughly run tap through once again way have hardened thread will last almost long plastic #3 proper type screw no matter what type screw use #2 too little Probably significantly us claim need voltage regulator five-cell packs Since can tell difference servo operation voltage drops two-hundredths volt 013March 1999 91 Wire harness end servo case can present problems mounting Wires side convenient some cases PUT ON SOME AIRS Sport-Airs TFOIA-Airs m A~NE W N NUU5WNN~ ~7 RO Box 208 Methuen MA 01844 phone 978 686-0319 Visa Mastercard Welcome Call write full line catalog mga pilots po box 5631 fresno ca 93755 tel 559 224-4170 fax 559 224-2789 wwwprofitscapecomlbetalmga/ inch slop results using No 2 screws must unacceptable Getting screw holes proper place important Its problem use predrilled plastic mounts can use wood might have seen ads Great Planes Dead Center Engine Mount Hole Locator DCEMHL got two airplanes ago best $899 have spent long time DCEMHL does perfect job locating holes engine mount much less time measure twice drill once method evolved DCEMHL also does perfect job locating mounting holes servos Just sure grommets inserted properly temporarily insert eyelets top use DCEMHL instructed locate engine holes Drill tap holes servos will mount distortion pulling grommets Dont forget reinstall eyelets bottom have ever mounted servos way other plastic trays might know wire sticking out end can problem have make some sort groove cutout clear sometimes weakens mounting structure Attention radio manufacturers would help wire came out side some cases can make cases mentioned earlier cant try everything cannot check 111 servos available see wire can made come out side servo However takes some servos cutting slot side case maybe bottom similar slots end rerouting wire some maybes Some servos have wires attached bottom PC board other servos have top Someespecially miniservos microservoswill probably have room wire other path originally created standard-size servos did try Airtronics 102 & 322 Futaba 148 Hitec 300 Tower TS-53 easily changed caution 148 might apply other cases PC board combination through hole SMT has pointed wire ends sticking up board path might want reroute wiring Trim wire points flush hoard Otherwise pressure bottom cover might cause ends puncture wires insulation disastrous results piece thin acetate sheet inserted under wires would desirable Till next time 73 Best Regards Hams say Remember have input regarding direction effort will take write let know rel 2M has very popular introduction back 1993 larger version wonderful flying sail Kestrel 100 its larger span hinh greater performance its little increase wings speed wingloading planform breakthrough sailplane 92 Model Aviation r 20 $5795 Train-Air 40 S 7295 - $6195 $7795 a11 Introduces Special Also av K RE wingspan ioo wing area 935 sq weight 46 oz wingloading 65 oz/sq ft Airfoil 507084/7080 Skill level Nov/Nov Radio standard reteiver 2-3 servos 550 mab battery patk N mers ie so pen rate L/D fa Wingspan 78 ight 36 oz Airfoil 0 standard its NSP Northeast S usedProducts iother16 Kirby Lane 14 h t tp 11w w w ii corn
