A Simple Glow Plug Battery Box youre just start ing out budget may want build simple glow plug battery box uses common D-size dry cells will help ensure good strong starts ECol PJ Render MAJOR PROBLEM faced ginning RC fliers lack availability fresh glow plug starting batteries Unfor tunately particular batteries made just thingmake glow plugs glow Thats popular function com pared lighting flashlights running trans istor radios Since dont sell stores hobby shops tend carry glow plug batteries find half its life usually spent just sitting shelf Few things frustrating trying start new engine stale battery Most experienced fliers have switched rechargeable Ni-Cd glow plug batteries However unlike glow plugs designed glow maximally 15 volts Ni-Cds deliver 12 volts Thats usually enough start engine shortlived Ni-Cds must charged after fly ing sessionsomething occasionally get Another drawback Ni-Cd ITI ItfT2 UNDERSIDE OF TOP 5-7/8x I-7/8x3/8Ia7/ 1 DRILL W4 SUGGEST flNEEB CONSTRUCTION EXCEPT AS NOTED SCREW ANGLE m BOTTOM END starting batteries chargers ex pensive especially young people trying save enough money buy first kit alternative presented simple battery box using four D cells works quite well Connecting four D cells paral lel provides necessary amperage glow plugs being commonly used bat teries usually fresh readily available Ordinary D cells may last sea son depending efficiently start 1-1/4 v 3/4 GLOW PLUG BATTERY BOX TOP TI /WIRE EXIT II SR PLATE OUTLINE 6-7/8x 4x I/B MAKE 2 FROM PLYWOOD OR MASONITEI-3/8x 2-l/4x3/4 BOTTOM6-7/8x I-3/Bx 3/4 engine must have best try alkaline cells four wont cost much Ni-Cd Incidentally dreamed up box just start ing out hobby about 20 years ago version uses simplified spring sys tem should easy youngsters make can assembled solder ing lack skill soldering will make reliable gets older metals start oxidize 72 Model Aviation neat economical little battery box will provide hot 15 volts glow plug Likely will find materials build right scrap bin workshop BOTTOM WI RE EXIT _________SIDE VIEW SR8SL NOTCH SR FINGER SPRINGONLY PLATE-FROM TIN CAN STOCK Ilx 5-1/4 -J Left top drilled lamp cord exits angle shown hole should start near center contact point wire will emerge under thumbtack Right bared wire wrapped around thumbtack stem thumbtack fully seated wood drop CyA will help keep tacks working loose Also soldering wires tacks will assure reliability materials cost box almost zero fact chances youll find thing need junk pile Lets get started Using drawing photos guide will probably find building box self-explanatory following con struction notes benefit begin ners hobby sides bottom well T 1 cut 34-in pine Use %-in pine T2 size unavailable may substi tute freely4-in plywood would work fine used -in Masonite cover plates again may substitute will Remember goal zero cost Using tin snips cut strip 1 x 514 coffee can something similar finger-spring plate Cut out triangles make finger springs Using small nail punch corners spring plate shown mounting screws Try get holes far corners possi ble screw heads wont interfere battery cells later will using small wood screws sheet metal screws mount plate 3-56 screw commonly used mount Cox 049 engine appropriate size need adjust fit further drilling first clamp sheet metal work sur face another board top barely expos ing screw hole Holding hand attempting drill sure way flict injury Sand shiny surface until clean sand painted surface remove paint areas adjacent screw holes Bend fingers up 14 adhere two small squares double-sided foam tape underside act spring helpers wish may glue kind rubber substitute foam tape Measure 34 in side box bottom draw two lines Separate 24-in length heavy lamp cord two Continued page 176 December 1989 73 Above The finger spring plate centered bottom box shown attached two small wood screws Note position lamp cord right side photo Right Sides box glued backplate/bottom assembly using D-size dry cells playing card thin sheet cardboard allow proper amount looseness Note cord exiting right Left two top pieces simply centered glued together top screws should fit top loosely thread snugly sides Right Using dry cells piece carbon paper transferring agent easy mark top contact point positions monthly publication covering International RC Soaring Scene US $17 yr 21/yr lstCiass Canada/Mexico S22/yr US funds Asia & Pacific $28/yr US funds Europe UK $28/yr US funds Surface Mall Foreign $18/yr US funds RO SOARING DIGEST PO Box 1079 Payson AZ 85547 before covering silk permits silk stretched tight dramatically re duces amount dope absorbs result very taut double covering relatively impervious changes temper ature moisture enhances torsional rigidity wing wing tips should tissue covered As stabilizer apply least three coats nitrate dope wing plus fuelproofer inboard panels Set wing aside allow cure thoroughly right inboard wing panel should have / washin Fin Cut part A-in soft balsa sheet outline shown plan Carve sand streamlined shape indicated Fuselage Select four /6 x 3A6 straight grained spruce strips longerons Carve triangular shape starting about 3 aft Section indicated plan Cut two fuselage sides /6 soft sheet balsa Pin side over plan glue longerons Insert %-in balsa bulkheads just forward aft pylon spacing shown plan Remove first fuselage side plan glue shaped longerons second side longerons dry tach side bulkheads making sure doing entire fuselage prop erly aligned Select sheet medium a fuselage bottom Sand smooth bottom two fuselage sides longerons con necting bulkheads glue entire assembly bottom sheet Pin entire structure flat surface desired Cut pylon very accurately hard %-in sheet balsa notch bulk heads glue firmly place Ensure perfectly vertical Sand smooth fuselage top attach /6 cover sheet along its entire length Glue 46 soft sheet pylon sides place Prepare wing stabilizer platforms shown plan Remove fuselage assembly plan dry Cut drill A-in ply wood firewall fit commercially available aluminum engine pans Install Electric Flight f Controller Perfect 05 Motors 510 cells LIghtweight 12 oo Adjustable switching pointmoney back Solderless tenninal easy hookup $2guarantee ON/OFF Controller495 Power save weight Very high efficiency O06V loss 20 5fre 22x13x63 Add 51ffl shippiog Colitorojo resideoto odd 65% $163 Too Send Chrek money order ooeooith11High Sky Fntaho comooto 3929 Kansas St #9 Otesooe San DlegocA 92104 blind mounting nuts epoxy firewall fuselage forward bulkhead shown plan File carve sand ward fuselage smooth configuration ensure clean junction engine mount Cover entire area fiber glass epoxy resin Sand balance fuselage smooth add wing stabilizer platforms Slot fuselage fin insert shown plan check alignment glue place Add %2 spruce dowel DT bands tubing ex ternal DT string Bend wing hooks /16 wire shown plan epoxy firmly place Sand smooth entire fuselage apply two coats clear dope Install engine DT timers normally apply two coats epoxy paint fuselage finish primarily because durable absolutely fuel-proof de sired however fuselage can tissue covered doped Ensure adequate fuel-proofing applied latter proce dure used original A-B Shrike used pressure fuel system illustrated plans photographs pen bladder pressure system can used preferred Install hot 15-23 size engine choice pre pare model flight testing Flight testing hot A-B model like Shrike first few test flights usually critical airplane passes crucible mishap remaining flights become easier Before attempting first test flight check model carefully proper align ment center-of-gravity location free dom warps test glide adjust plane necessary small increments packing under leading trailing edge stabilizer Hand glides should re veal slight right turn produced adjust ing stab tilt Once glide satisfactory ship ready its first power flight Set en gine timer three-second run start engine hand launch model gently wind about 450 el evation Climb should straight out angle launch slight right spiral observe tendency veer leftward climb correct immediately its generally fatal condition subsequent test flights increase length engine run flight pattern safety mention intestinal forti tude permit models gen eral design have required about %2 left rudder tab keep tail down during climbout /8 washin right board wing panel helps keep latter up during ascent word caution using Shrike interchangeably classes B repeat test procedure upon switching engines Nothing affects Shrikes climb pattern drastically major changes power ergo speed Unless abso lutely certain B engines have equal power output its prudent few short test flights after changing en gines full 9-to-12-second engine run model should make two full turns right during climb enter its glide pattern no stall loss altitude airplane built according plans flight patterns automatically will right-right Competition durability built shown ready-to-fly weight about 24 26 ounces opinion assuming hot engine used extra weight wont noticeably reduce performanceand rugged construction will carry model through several contest seasons Modelers limited building time simply prefer competing building will find Shrikes longevity great advantage risk being iconoclast offer suggestion enhance models du rability further minimize unnecessary testing Once wing stabilizer have aged model properly adjusted has proven competition-worthy little addi tional testing necessary Probably two three short DT flights before contest should suffice question philosophy will take moment recall folded wings damaged models lost Free Flight ships have expe rience traceable superfluous test flights think theyll concede point Battery Box/Render Continued page 73 wires strip 1/2 insulation end Placing spring plate equidistant between lines box bot tom mark mounting holes through wood sharp pencil photos shows spring plate position No tice uncut side opposite spring fingers approximately flush edge wood Drill pilot holes using 1A6 drill slight angle screw does split wood see drawing Mount spring plate screws trapping bared lamp cord under plate Its good idea 176 Model Aviation though optional roughen screw head wire sandpaper solder wire Glue box bottom backplate type wood glue used thick cyanoac rylate CyA speed Five-minute epoxy would also work well set glue two box sides place notch sidepiece goes over wire Use four battery cells piece thin cardboard playing card align sides proper width glue place dry remove cells glue other plate Center top T 1 over T2 drawing glue place Position top box drill pilot holes top screws Drill way through top side A-in drill remove top enlarge its holes /i6 Assemble tighten two 1 -in screws should fit top loosely thread side side screw holes should reinforced CyA because pines softness Using battery cells carbon paper let positive end cells mark con tact point location top Drill through top angle shown plan starting about / away center contact point emerging through top Strip 5 insulation other 24-in strand heavy lamp cord inch time Sand both undersides tops four thumbtacks clean paint Thread wire through hole top starting insulated end passing up through underside top Pull through until insulation flush hole contact side point twist bare wire nearest insulation around pin thumbtack press center carbon mark next three thumbtacks cut off excess wire Again soldering optional recommended Tape wires together enough slack easily open box tape again four inches Add fa vorite glow plug clip soldering no problem buy small two-pronged malewith-female plug Radio Shack similar retailer solder cord female side closer battery box carrying battery box field box flying sessions sure separate plug avoid shorting clip metal objects Switches advisablethe on/off positions can some times confused creating starting prob lems cant solder put clip small heavy plastic bag close baggie tie transit Its good idea paint exterior new box fuel-proof paint may have available short order box will look mess dry install battery cells tighten screws firmly compress springs get good broad contact couple extra notes seem order An December 1989 177 THE WORLDS FINEST SMALL ENGINES Lb easier approach would simply tape four D cells together roughen sol der leads parallel beauty box though cells low can simply stop corner store way field pop four new cells go flying Keep cord length 24 inches Too long cord causes higher resistance weaker glow shorter battery life think youll surprised much easier fun life flying field can consistently quick hot starts using fresh 15-volt dry cells FF Duration/Murphy Continued page 75 tions now handling Don Ross fine book Rubber-Powered Model Airplanes Copies $12 postpaid NFFS members$14 nonmem bers would make fine gift Rubber en thusiast novice expert alike Tips tabloids Wasatch Flyer news letter credits complement Jay Jack son experimenting new Satellite JETS FAN FUNFLY PILOTS CHOICE AWARDS TOP DUN EVENT HELICOPTER NOVICE INTER MEDIATE FAI SCALE Itched Irformance system TOP PERFORMANCE K&B ENGINES AirplaneManne K&B FUELS K&B GLOW PLUGS 9 Blends4 Choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B MIcro-BSIIoSSS FILLER K&B SUPER POXY RESIN K&B SUPER POXY THINNER K&B SUPER POXY PRIMER K&B SUPER POXY PAINT K&B MIXING CUPS City User Friendly Odorless UFO Hot Stuff cy anoacrylate CyA cement covered sheeted portion model 7-oz/sq-yd fi berglass cloth using thin UFO found io add considerable strength very little weight gain En contrast found standard thin CyA unsatisfactory purpose its very low viscosity allows penetrate wood too read ily thereby adding excessive weight Also UFO seemed permit little working time filled weave cloth much better Jay also recommends PlC Skin Shield hand protection working CyA other types hazardous materials modelers use abuse Since normal CyA cements raise havoc sinuses jumped UFO stuff hit hobby shop shelves bit disappointed experienced limited reten tion depending its use Jay Jacksons applica tion intriguing suggests some merit may due odorless option after Jay also supplied chart weights dif ferent brands fuel shutoffs made up process selecting satisfactory timer new /2A model Since recently gone through similar study own purposes listing caught eye Jays chart reads fol SCALE AMA SPORT SCALE SPORTSMAN ESPERT GIANT SCALE PATTERN NOVICE SPORTSMAN ADVANCED MASTERS iNS PAl RACING FORMULA 1 1/4 MIDGET SPORT PYLON RITETUESDAYWEERERDAYTHURSDAYFRIDAYRATURDAYRURDAYMORDAY DEC 2R1h DEC 215DEC ZRIRDEC 255DEC SUMDEC SIMJAN lEt PATTERNPATTERNPATTERN114 MIDGET C ALL ALL RACINGSPORTFORMULA ACLASSESCLASSESCLASSES NIGHTPVLON RACING CBANQUET D SCALE STATICSCALEJETSJETS AJUDGING D RW HELl HELl RECDPTERSCOPTERS EL EDO FEE FOR FIRST EUENT 1525 IF POSTMARKED PRIOR TO NDVEMRER iStil El FOR EACH ADDITIONAL EVENT NIGHT FLV iO IF ADDITIONAL EVENTI SANDUET PERUONFOR INFORMATION ONLY SEND SAME THE REMOTE CONTROL ASSOCIATION OF CENTRAL FLORIDA PRESENTS THE WORLDS LARGEST INDEPENDENT RADIO CONTROL COMPETITION THE 22nd ANNUAL RUNWAY fAN6EIUNE DECEMBER 2R iRES ARY 1 ISH ES 1ST RAT ID N/IN PO S C C BOA 948213 MAITLAND FL 521946213
Edition: Model Aviation - 1989/12
Page Numbers: 72, 73, 176, 177
A Simple Glow Plug Battery Box youre just start ing out budget may want build simple glow plug battery box uses common D-size dry cells will help ensure good strong starts ECol PJ Render MAJOR PROBLEM faced ginning RC fliers lack availability fresh glow plug starting batteries Unfor tunately particular batteries made just thingmake glow plugs glow Thats popular function com pared lighting flashlights running trans istor radios Since dont sell stores hobby shops tend carry glow plug batteries find half its life usually spent just sitting shelf Few things frustrating trying start new engine stale battery Most experienced fliers have switched rechargeable Ni-Cd glow plug batteries However unlike glow plugs designed glow maximally 15 volts Ni-Cds deliver 12 volts Thats usually enough start engine shortlived Ni-Cds must charged after fly ing sessionsomething occasionally get Another drawback Ni-Cd ITI ItfT2 UNDERSIDE OF TOP 5-7/8x I-7/8x3/8Ia7/ 1 DRILL W4 SUGGEST flNEEB CONSTRUCTION EXCEPT AS NOTED SCREW ANGLE m BOTTOM END starting batteries chargers ex pensive especially young people trying save enough money buy first kit alternative presented simple battery box using four D cells works quite well Connecting four D cells paral lel provides necessary amperage glow plugs being commonly used bat teries usually fresh readily available Ordinary D cells may last sea son depending efficiently start 1-1/4 v 3/4 GLOW PLUG BATTERY BOX TOP TI /WIRE EXIT II SR PLATE OUTLINE 6-7/8x 4x I/B MAKE 2 FROM PLYWOOD OR MASONITEI-3/8x 2-l/4x3/4 BOTTOM6-7/8x I-3/Bx 3/4 engine must have best try alkaline cells four wont cost much Ni-Cd Incidentally dreamed up box just start ing out hobby about 20 years ago version uses simplified spring sys tem should easy youngsters make can assembled solder ing lack skill soldering will make reliable gets older metals start oxidize 72 Model Aviation neat economical little battery box will provide hot 15 volts glow plug Likely will find materials build right scrap bin workshop BOTTOM WI RE EXIT _________SIDE VIEW SR8SL NOTCH SR FINGER SPRINGONLY PLATE-FROM TIN CAN STOCK Ilx 5-1/4 -J Left top drilled lamp cord exits angle shown hole should start near center contact point wire will emerge under thumbtack Right bared wire wrapped around thumbtack stem thumbtack fully seated wood drop CyA will help keep tacks working loose Also soldering wires tacks will assure reliability materials cost box almost zero fact chances youll find thing need junk pile Lets get started Using drawing photos guide will probably find building box self-explanatory following con struction notes benefit begin ners hobby sides bottom well T 1 cut 34-in pine Use %-in pine T2 size unavailable may substi tute freely4-in plywood would work fine used -in Masonite cover plates again may substitute will Remember goal zero cost Using tin snips cut strip 1 x 514 coffee can something similar finger-spring plate Cut out triangles make finger springs Using small nail punch corners spring plate shown mounting screws Try get holes far corners possi ble screw heads wont interfere battery cells later will using small wood screws sheet metal screws mount plate 3-56 screw commonly used mount Cox 049 engine appropriate size need adjust fit further drilling first clamp sheet metal work sur face another board top barely expos ing screw hole Holding hand attempting drill sure way flict injury Sand shiny surface until clean sand painted surface remove paint areas adjacent screw holes Bend fingers up 14 adhere two small squares double-sided foam tape underside act spring helpers wish may glue kind rubber substitute foam tape Measure 34 in side box bottom draw two lines Separate 24-in length heavy lamp cord two Continued page 176 December 1989 73 Above The finger spring plate centered bottom box shown attached two small wood screws Note position lamp cord right side photo Right Sides box glued backplate/bottom assembly using D-size dry cells playing card thin sheet cardboard allow proper amount looseness Note cord exiting right Left two top pieces simply centered glued together top screws should fit top loosely thread snugly sides Right Using dry cells piece carbon paper transferring agent easy mark top contact point positions monthly publication covering International RC Soaring Scene US $17 yr 21/yr lstCiass Canada/Mexico S22/yr US funds Asia & Pacific $28/yr US funds Europe UK $28/yr US funds Surface Mall Foreign $18/yr US funds RO SOARING DIGEST PO Box 1079 Payson AZ 85547 before covering silk permits silk stretched tight dramatically re duces amount dope absorbs result very taut double covering relatively impervious changes temper ature moisture enhances torsional rigidity wing wing tips should tissue covered As stabilizer apply least three coats nitrate dope wing plus fuelproofer inboard panels Set wing aside allow cure thoroughly right inboard wing panel should have / washin Fin Cut part A-in soft balsa sheet outline shown plan Carve sand streamlined shape indicated Fuselage Select four /6 x 3A6 straight grained spruce strips longerons Carve triangular shape starting about 3 aft Section indicated plan Cut two fuselage sides /6 soft sheet balsa Pin side over plan glue longerons Insert %-in balsa bulkheads just forward aft pylon spacing shown plan Remove first fuselage side plan glue shaped longerons second side longerons dry tach side bulkheads making sure doing entire fuselage prop erly aligned Select sheet medium a fuselage bottom Sand smooth bottom two fuselage sides longerons con necting bulkheads glue entire assembly bottom sheet Pin entire structure flat surface desired Cut pylon very accurately hard %-in sheet balsa notch bulk heads glue firmly place Ensure perfectly vertical Sand smooth fuselage top attach /6 cover sheet along its entire length Glue 46 soft sheet pylon sides place Prepare wing stabilizer platforms shown plan Remove fuselage assembly plan dry Cut drill A-in ply wood firewall fit commercially available aluminum engine pans Install Electric Flight f Controller Perfect 05 Motors 510 cells LIghtweight 12 oo Adjustable switching pointmoney back Solderless tenninal easy hookup $2guarantee ON/OFF Controller495 Power save weight Very high efficiency O06V loss 20 5fre 22x13x63 Add 51ffl shippiog Colitorojo resideoto odd 65% $163 Too Send Chrek money order ooeooith11High Sky Fntaho comooto 3929 Kansas St #9 Otesooe San DlegocA 92104 blind mounting nuts epoxy firewall fuselage forward bulkhead shown plan File carve sand ward fuselage smooth configuration ensure clean junction engine mount Cover entire area fiber glass epoxy resin Sand balance fuselage smooth add wing stabilizer platforms Slot fuselage fin insert shown plan check alignment glue place Add %2 spruce dowel DT bands tubing ex ternal DT string Bend wing hooks /16 wire shown plan epoxy firmly place Sand smooth entire fuselage apply two coats clear dope Install engine DT timers normally apply two coats epoxy paint fuselage finish primarily because durable absolutely fuel-proof de sired however fuselage can tissue covered doped Ensure adequate fuel-proofing applied latter proce dure used original A-B Shrike used pressure fuel system illustrated plans photographs pen bladder pressure system can used preferred Install hot 15-23 size engine choice pre pare model flight testing Flight testing hot A-B model like Shrike first few test flights usually critical airplane passes crucible mishap remaining flights become easier Before attempting first test flight check model carefully proper align ment center-of-gravity location free dom warps test glide adjust plane necessary small increments packing under leading trailing edge stabilizer Hand glides should re veal slight right turn produced adjust ing stab tilt Once glide satisfactory ship ready its first power flight Set en gine timer three-second run start engine hand launch model gently wind about 450 el evation Climb should straight out angle launch slight right spiral observe tendency veer leftward climb correct immediately its generally fatal condition subsequent test flights increase length engine run flight pattern safety mention intestinal forti tude permit models gen eral design have required about %2 left rudder tab keep tail down during climbout /8 washin right board wing panel helps keep latter up during ascent word caution using Shrike interchangeably classes B repeat test procedure upon switching engines Nothing affects Shrikes climb pattern drastically major changes power ergo speed Unless abso lutely certain B engines have equal power output its prudent few short test flights after changing en gines full 9-to-12-second engine run model should make two full turns right during climb enter its glide pattern no stall loss altitude airplane built according plans flight patterns automatically will right-right Competition durability built shown ready-to-fly weight about 24 26 ounces opinion assuming hot engine used extra weight wont noticeably reduce performanceand rugged construction will carry model through several contest seasons Modelers limited building time simply prefer competing building will find Shrikes longevity great advantage risk being iconoclast offer suggestion enhance models du rability further minimize unnecessary testing Once wing stabilizer have aged model properly adjusted has proven competition-worthy little addi tional testing necessary Probably two three short DT flights before contest should suffice question philosophy will take moment recall folded wings damaged models lost Free Flight ships have expe rience traceable superfluous test flights think theyll concede point Battery Box/Render Continued page 73 wires strip 1/2 insulation end Placing spring plate equidistant between lines box bot tom mark mounting holes through wood sharp pencil photos shows spring plate position No tice uncut side opposite spring fingers approximately flush edge wood Drill pilot holes using 1A6 drill slight angle screw does split wood see drawing Mount spring plate screws trapping bared lamp cord under plate Its good idea 176 Model Aviation though optional roughen screw head wire sandpaper solder wire Glue box bottom backplate type wood glue used thick cyanoac rylate CyA speed Five-minute epoxy would also work well set glue two box sides place notch sidepiece goes over wire Use four battery cells piece thin cardboard playing card align sides proper width glue place dry remove cells glue other plate Center top T 1 over T2 drawing glue place Position top box drill pilot holes top screws Drill way through top side A-in drill remove top enlarge its holes /i6 Assemble tighten two 1 -in screws should fit top loosely thread side side screw holes should reinforced CyA because pines softness Using battery cells carbon paper let positive end cells mark con tact point location top Drill through top angle shown plan starting about / away center contact point emerging through top Strip 5 insulation other 24-in strand heavy lamp cord inch time Sand both undersides tops four thumbtacks clean paint Thread wire through hole top starting insulated end passing up through underside top Pull through until insulation flush hole contact side point twist bare wire nearest insulation around pin thumbtack press center carbon mark next three thumbtacks cut off excess wire Again soldering optional recommended Tape wires together enough slack easily open box tape again four inches Add fa vorite glow plug clip soldering no problem buy small two-pronged malewith-female plug Radio Shack similar retailer solder cord female side closer battery box carrying battery box field box flying sessions sure separate plug avoid shorting clip metal objects Switches advisablethe on/off positions can some times confused creating starting prob lems cant solder put clip small heavy plastic bag close baggie tie transit Its good idea paint exterior new box fuel-proof paint may have available short order box will look mess dry install battery cells tighten screws firmly compress springs get good broad contact couple extra notes seem order An December 1989 177 THE WORLDS FINEST SMALL ENGINES Lb easier approach would simply tape four D cells together roughen sol der leads parallel beauty box though cells low can simply stop corner store way field pop four new cells go flying Keep cord length 24 inches Too long cord causes higher resistance weaker glow shorter battery life think youll surprised much easier fun life flying field can consistently quick hot starts using fresh 15-volt dry cells FF Duration/Murphy Continued page 75 tions now handling Don Ross fine book Rubber-Powered Model Airplanes Copies $12 postpaid NFFS members$14 nonmem bers would make fine gift Rubber en thusiast novice expert alike Tips tabloids Wasatch Flyer news letter credits complement Jay Jack son experimenting new Satellite JETS FAN FUNFLY PILOTS CHOICE AWARDS TOP DUN EVENT HELICOPTER NOVICE INTER MEDIATE FAI SCALE Itched Irformance system TOP PERFORMANCE K&B ENGINES AirplaneManne K&B FUELS K&B GLOW PLUGS 9 Blends4 Choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B MIcro-BSIIoSSS FILLER K&B SUPER POXY RESIN K&B SUPER POXY THINNER K&B SUPER POXY PRIMER K&B SUPER POXY PAINT K&B MIXING CUPS City User Friendly Odorless UFO Hot Stuff cy anoacrylate CyA cement covered sheeted portion model 7-oz/sq-yd fi berglass cloth using thin UFO found io add considerable strength very little weight gain En contrast found standard thin CyA unsatisfactory purpose its very low viscosity allows penetrate wood too read ily thereby adding excessive weight Also UFO seemed permit little working time filled weave cloth much better Jay also recommends PlC Skin Shield hand protection working CyA other types hazardous materials modelers use abuse Since normal CyA cements raise havoc sinuses jumped UFO stuff hit hobby shop shelves bit disappointed experienced limited reten tion depending its use Jay Jacksons applica tion intriguing suggests some merit may due odorless option after Jay also supplied chart weights dif ferent brands fuel shutoffs made up process selecting satisfactory timer new /2A model Since recently gone through similar study own purposes listing caught eye Jays chart reads fol SCALE AMA SPORT SCALE SPORTSMAN ESPERT GIANT SCALE PATTERN NOVICE SPORTSMAN ADVANCED MASTERS iNS PAl RACING FORMULA 1 1/4 MIDGET SPORT PYLON RITETUESDAYWEERERDAYTHURSDAYFRIDAYRATURDAYRURDAYMORDAY DEC 2R1h DEC 215DEC ZRIRDEC 255DEC SUMDEC SIMJAN lEt PATTERNPATTERNPATTERN114 MIDGET C ALL ALL RACINGSPORTFORMULA ACLASSESCLASSESCLASSES NIGHTPVLON RACING CBANQUET D SCALE STATICSCALEJETSJETS AJUDGING D RW HELl HELl RECDPTERSCOPTERS EL EDO FEE FOR FIRST EUENT 1525 IF POSTMARKED PRIOR TO NDVEMRER iStil El FOR EACH ADDITIONAL EVENT NIGHT FLV iO IF ADDITIONAL EVENTI SANDUET PERUONFOR INFORMATION ONLY SEND SAME THE REMOTE CONTROL ASSOCIATION OF CENTRAL FLORIDA PRESENTS THE WORLDS LARGEST INDEPENDENT RADIO CONTROL COMPETITION THE 22nd ANNUAL RUNWAY fAN6EIUNE DECEMBER 2R iRES ARY 1 ISH ES 1ST RAT ID N/IN PO S C C BOA 948213 MAITLAND FL 521946213
Edition: Model Aviation - 1989/12
Page Numbers: 72, 73, 176, 177
A Simple Glow Plug Battery Box youre just start ing out budget may want build simple glow plug battery box uses common D-size dry cells will help ensure good strong starts ECol PJ Render MAJOR PROBLEM faced ginning RC fliers lack availability fresh glow plug starting batteries Unfor tunately particular batteries made just thingmake glow plugs glow Thats popular function com pared lighting flashlights running trans istor radios Since dont sell stores hobby shops tend carry glow plug batteries find half its life usually spent just sitting shelf Few things frustrating trying start new engine stale battery Most experienced fliers have switched rechargeable Ni-Cd glow plug batteries However unlike glow plugs designed glow maximally 15 volts Ni-Cds deliver 12 volts Thats usually enough start engine shortlived Ni-Cds must charged after fly ing sessionsomething occasionally get Another drawback Ni-Cd ITI ItfT2 UNDERSIDE OF TOP 5-7/8x I-7/8x3/8Ia7/ 1 DRILL W4 SUGGEST flNEEB CONSTRUCTION EXCEPT AS NOTED SCREW ANGLE m BOTTOM END starting batteries chargers ex pensive especially young people trying save enough money buy first kit alternative presented simple battery box using four D cells works quite well Connecting four D cells paral lel provides necessary amperage glow plugs being commonly used bat teries usually fresh readily available Ordinary D cells may last sea son depending efficiently start 1-1/4 v 3/4 GLOW PLUG BATTERY BOX TOP TI /WIRE EXIT II SR PLATE OUTLINE 6-7/8x 4x I/B MAKE 2 FROM PLYWOOD OR MASONITEI-3/8x 2-l/4x3/4 BOTTOM6-7/8x I-3/Bx 3/4 engine must have best try alkaline cells four wont cost much Ni-Cd Incidentally dreamed up box just start ing out hobby about 20 years ago version uses simplified spring sys tem should easy youngsters make can assembled solder ing lack skill soldering will make reliable gets older metals start oxidize 72 Model Aviation neat economical little battery box will provide hot 15 volts glow plug Likely will find materials build right scrap bin workshop BOTTOM WI RE EXIT _________SIDE VIEW SR8SL NOTCH SR FINGER SPRINGONLY PLATE-FROM TIN CAN STOCK Ilx 5-1/4 -J Left top drilled lamp cord exits angle shown hole should start near center contact point wire will emerge under thumbtack Right bared wire wrapped around thumbtack stem thumbtack fully seated wood drop CyA will help keep tacks working loose Also soldering wires tacks will assure reliability materials cost box almost zero fact chances youll find thing need junk pile Lets get started Using drawing photos guide will probably find building box self-explanatory following con struction notes benefit begin ners hobby sides bottom well T 1 cut 34-in pine Use %-in pine T2 size unavailable may substi tute freely4-in plywood would work fine used -in Masonite cover plates again may substitute will Remember goal zero cost Using tin snips cut strip 1 x 514 coffee can something similar finger-spring plate Cut out triangles make finger springs Using small nail punch corners spring plate shown mounting screws Try get holes far corners possi ble screw heads wont interfere battery cells later will using small wood screws sheet metal screws mount plate 3-56 screw commonly used mount Cox 049 engine appropriate size need adjust fit further drilling first clamp sheet metal work sur face another board top barely expos ing screw hole Holding hand attempting drill sure way flict injury Sand shiny surface until clean sand painted surface remove paint areas adjacent screw holes Bend fingers up 14 adhere two small squares double-sided foam tape underside act spring helpers wish may glue kind rubber substitute foam tape Measure 34 in side box bottom draw two lines Separate 24-in length heavy lamp cord two Continued page 176 December 1989 73 Above The finger spring plate centered bottom box shown attached two small wood screws Note position lamp cord right side photo Right Sides box glued backplate/bottom assembly using D-size dry cells playing card thin sheet cardboard allow proper amount looseness Note cord exiting right Left two top pieces simply centered glued together top screws should fit top loosely thread snugly sides Right Using dry cells piece carbon paper transferring agent easy mark top contact point positions monthly publication covering International RC Soaring Scene US $17 yr 21/yr lstCiass Canada/Mexico S22/yr US funds Asia & Pacific $28/yr US funds Europe UK $28/yr US funds Surface Mall Foreign $18/yr US funds RO SOARING DIGEST PO Box 1079 Payson AZ 85547 before covering silk permits silk stretched tight dramatically re duces amount dope absorbs result very taut double covering relatively impervious changes temper ature moisture enhances torsional rigidity wing wing tips should tissue covered As stabilizer apply least three coats nitrate dope wing plus fuelproofer inboard panels Set wing aside allow cure thoroughly right inboard wing panel should have / washin Fin Cut part A-in soft balsa sheet outline shown plan Carve sand streamlined shape indicated Fuselage Select four /6 x 3A6 straight grained spruce strips longerons Carve triangular shape starting about 3 aft Section indicated plan Cut two fuselage sides /6 soft sheet balsa Pin side over plan glue longerons Insert %-in balsa bulkheads just forward aft pylon spacing shown plan Remove first fuselage side plan glue shaped longerons second side longerons dry tach side bulkheads making sure doing entire fuselage prop erly aligned Select sheet medium a fuselage bottom Sand smooth bottom two fuselage sides longerons con necting bulkheads glue entire assembly bottom sheet Pin entire structure flat surface desired Cut pylon very accurately hard %-in sheet balsa notch bulk heads glue firmly place Ensure perfectly vertical Sand smooth fuselage top attach /6 cover sheet along its entire length Glue 46 soft sheet pylon sides place Prepare wing stabilizer platforms shown plan Remove fuselage assembly plan dry Cut drill A-in ply wood firewall fit commercially available aluminum engine pans Install Electric Flight f Controller Perfect 05 Motors 510 cells LIghtweight 12 oo Adjustable switching pointmoney back Solderless tenninal easy hookup $2guarantee ON/OFF Controller495 Power save weight Very high efficiency O06V loss 20 5fre 22x13x63 Add 51ffl shippiog Colitorojo resideoto odd 65% $163 Too Send Chrek money order ooeooith11High Sky Fntaho comooto 3929 Kansas St #9 Otesooe San DlegocA 92104 blind mounting nuts epoxy firewall fuselage forward bulkhead shown plan File carve sand ward fuselage smooth configuration ensure clean junction engine mount Cover entire area fiber glass epoxy resin Sand balance fuselage smooth add wing stabilizer platforms Slot fuselage fin insert shown plan check alignment glue place Add %2 spruce dowel DT bands tubing ex ternal DT string Bend wing hooks /16 wire shown plan epoxy firmly place Sand smooth entire fuselage apply two coats clear dope Install engine DT timers normally apply two coats epoxy paint fuselage finish primarily because durable absolutely fuel-proof de sired however fuselage can tissue covered doped Ensure adequate fuel-proofing applied latter proce dure used original A-B Shrike used pressure fuel system illustrated plans photographs pen bladder pressure system can used preferred Install hot 15-23 size engine choice pre pare model flight testing Flight testing hot A-B model like Shrike first few test flights usually critical airplane passes crucible mishap remaining flights become easier Before attempting first test flight check model carefully proper align ment center-of-gravity location free dom warps test glide adjust plane necessary small increments packing under leading trailing edge stabilizer Hand glides should re veal slight right turn produced adjust ing stab tilt Once glide satisfactory ship ready its first power flight Set en gine timer three-second run start engine hand launch model gently wind about 450 el evation Climb should straight out angle launch slight right spiral observe tendency veer leftward climb correct immediately its generally fatal condition subsequent test flights increase length engine run flight pattern safety mention intestinal forti tude permit models gen eral design have required about %2 left rudder tab keep tail down during climbout /8 washin right board wing panel helps keep latter up during ascent word caution using Shrike interchangeably classes B repeat test procedure upon switching engines Nothing affects Shrikes climb pattern drastically major changes power ergo speed Unless abso lutely certain B engines have equal power output its prudent few short test flights after changing en gines full 9-to-12-second engine run model should make two full turns right during climb enter its glide pattern no stall loss altitude airplane built according plans flight patterns automatically will right-right Competition durability built shown ready-to-fly weight about 24 26 ounces opinion assuming hot engine used extra weight wont noticeably reduce performanceand rugged construction will carry model through several contest seasons Modelers limited building time simply prefer competing building will find Shrikes longevity great advantage risk being iconoclast offer suggestion enhance models du rability further minimize unnecessary testing Once wing stabilizer have aged model properly adjusted has proven competition-worthy little addi tional testing necessary Probably two three short DT flights before contest should suffice question philosophy will take moment recall folded wings damaged models lost Free Flight ships have expe rience traceable superfluous test flights think theyll concede point Battery Box/Render Continued page 73 wires strip 1/2 insulation end Placing spring plate equidistant between lines box bot tom mark mounting holes through wood sharp pencil photos shows spring plate position No tice uncut side opposite spring fingers approximately flush edge wood Drill pilot holes using 1A6 drill slight angle screw does split wood see drawing Mount spring plate screws trapping bared lamp cord under plate Its good idea 176 Model Aviation though optional roughen screw head wire sandpaper solder wire Glue box bottom backplate type wood glue used thick cyanoac rylate CyA speed Five-minute epoxy would also work well set glue two box sides place notch sidepiece goes over wire Use four battery cells piece thin cardboard playing card align sides proper width glue place dry remove cells glue other plate Center top T 1 over T2 drawing glue place Position top box drill pilot holes top screws Drill way through top side A-in drill remove top enlarge its holes /i6 Assemble tighten two 1 -in screws should fit top loosely thread side side screw holes should reinforced CyA because pines softness Using battery cells carbon paper let positive end cells mark con tact point location top Drill through top angle shown plan starting about / away center contact point emerging through top Strip 5 insulation other 24-in strand heavy lamp cord inch time Sand both undersides tops four thumbtacks clean paint Thread wire through hole top starting insulated end passing up through underside top Pull through until insulation flush hole contact side point twist bare wire nearest insulation around pin thumbtack press center carbon mark next three thumbtacks cut off excess wire Again soldering optional recommended Tape wires together enough slack easily open box tape again four inches Add fa vorite glow plug clip soldering no problem buy small two-pronged malewith-female plug Radio Shack similar retailer solder cord female side closer battery box carrying battery box field box flying sessions sure separate plug avoid shorting clip metal objects Switches advisablethe on/off positions can some times confused creating starting prob lems cant solder put clip small heavy plastic bag close baggie tie transit Its good idea paint exterior new box fuel-proof paint may have available short order box will look mess dry install battery cells tighten screws firmly compress springs get good broad contact couple extra notes seem order An December 1989 177 THE WORLDS FINEST SMALL ENGINES Lb easier approach would simply tape four D cells together roughen sol der leads parallel beauty box though cells low can simply stop corner store way field pop four new cells go flying Keep cord length 24 inches Too long cord causes higher resistance weaker glow shorter battery life think youll surprised much easier fun life flying field can consistently quick hot starts using fresh 15-volt dry cells FF Duration/Murphy Continued page 75 tions now handling Don Ross fine book Rubber-Powered Model Airplanes Copies $12 postpaid NFFS members$14 nonmem bers would make fine gift Rubber en thusiast novice expert alike Tips tabloids Wasatch Flyer news letter credits complement Jay Jack son experimenting new Satellite JETS FAN FUNFLY PILOTS CHOICE AWARDS TOP DUN EVENT HELICOPTER NOVICE INTER MEDIATE FAI SCALE Itched Irformance system TOP PERFORMANCE K&B ENGINES AirplaneManne K&B FUELS K&B GLOW PLUGS 9 Blends4 Choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B MIcro-BSIIoSSS FILLER K&B SUPER POXY RESIN K&B SUPER POXY THINNER K&B SUPER POXY PRIMER K&B SUPER POXY PAINT K&B MIXING CUPS City User Friendly Odorless UFO Hot Stuff cy anoacrylate CyA cement covered sheeted portion model 7-oz/sq-yd fi berglass cloth using thin UFO found io add considerable strength very little weight gain En contrast found standard thin CyA unsatisfactory purpose its very low viscosity allows penetrate wood too read ily thereby adding excessive weight Also UFO seemed permit little working time filled weave cloth much better Jay also recommends PlC Skin Shield hand protection working CyA other types hazardous materials modelers use abuse Since normal CyA cements raise havoc sinuses jumped UFO stuff hit hobby shop shelves bit disappointed experienced limited reten tion depending its use Jay Jacksons applica tion intriguing suggests some merit may due odorless option after Jay also supplied chart weights dif ferent brands fuel shutoffs made up process selecting satisfactory timer new /2A model Since recently gone through similar study own purposes listing caught eye Jays chart reads fol SCALE AMA SPORT SCALE SPORTSMAN ESPERT GIANT SCALE PATTERN NOVICE SPORTSMAN ADVANCED MASTERS iNS PAl RACING FORMULA 1 1/4 MIDGET SPORT PYLON RITETUESDAYWEERERDAYTHURSDAYFRIDAYRATURDAYRURDAYMORDAY DEC 2R1h DEC 215DEC ZRIRDEC 255DEC SUMDEC SIMJAN lEt PATTERNPATTERNPATTERN114 MIDGET C ALL ALL RACINGSPORTFORMULA ACLASSESCLASSESCLASSES NIGHTPVLON RACING CBANQUET D SCALE STATICSCALEJETSJETS AJUDGING D RW HELl HELl RECDPTERSCOPTERS EL EDO FEE FOR FIRST EUENT 1525 IF POSTMARKED PRIOR TO NDVEMRER iStil El FOR EACH ADDITIONAL EVENT NIGHT FLV iO IF ADDITIONAL EVENTI SANDUET PERUONFOR INFORMATION ONLY SEND SAME THE REMOTE CONTROL ASSOCIATION OF CENTRAL FLORIDA PRESENTS THE WORLDS LARGEST INDEPENDENT RADIO CONTROL COMPETITION THE 22nd ANNUAL RUNWAY fAN6EIUNE DECEMBER 2R iRES ARY 1 ISH ES 1ST RAT ID N/IN PO S C C BOA 948213 MAITLAND FL 521946213
Edition: Model Aviation - 1989/12
Page Numbers: 72, 73, 176, 177
A Simple Glow Plug Battery Box youre just start ing out budget may want build simple glow plug battery box uses common D-size dry cells will help ensure good strong starts ECol PJ Render MAJOR PROBLEM faced ginning RC fliers lack availability fresh glow plug starting batteries Unfor tunately particular batteries made just thingmake glow plugs glow Thats popular function com pared lighting flashlights running trans istor radios Since dont sell stores hobby shops tend carry glow plug batteries find half its life usually spent just sitting shelf Few things frustrating trying start new engine stale battery Most experienced fliers have switched rechargeable Ni-Cd glow plug batteries However unlike glow plugs designed glow maximally 15 volts Ni-Cds deliver 12 volts Thats usually enough start engine shortlived Ni-Cds must charged after fly ing sessionsomething occasionally get Another drawback Ni-Cd ITI ItfT2 UNDERSIDE OF TOP 5-7/8x I-7/8x3/8Ia7/ 1 DRILL W4 SUGGEST flNEEB CONSTRUCTION EXCEPT AS NOTED SCREW ANGLE m BOTTOM END starting batteries chargers ex pensive especially young people trying save enough money buy first kit alternative presented simple battery box using four D cells works quite well Connecting four D cells paral lel provides necessary amperage glow plugs being commonly used bat teries usually fresh readily available Ordinary D cells may last sea son depending efficiently start 1-1/4 v 3/4 GLOW PLUG BATTERY BOX TOP TI /WIRE EXIT II SR PLATE OUTLINE 6-7/8x 4x I/B MAKE 2 FROM PLYWOOD OR MASONITEI-3/8x 2-l/4x3/4 BOTTOM6-7/8x I-3/Bx 3/4 engine must have best try alkaline cells four wont cost much Ni-Cd Incidentally dreamed up box just start ing out hobby about 20 years ago version uses simplified spring sys tem should easy youngsters make can assembled solder ing lack skill soldering will make reliable gets older metals start oxidize 72 Model Aviation neat economical little battery box will provide hot 15 volts glow plug Likely will find materials build right scrap bin workshop BOTTOM WI RE EXIT _________SIDE VIEW SR8SL NOTCH SR FINGER SPRINGONLY PLATE-FROM TIN CAN STOCK Ilx 5-1/4 -J Left top drilled lamp cord exits angle shown hole should start near center contact point wire will emerge under thumbtack Right bared wire wrapped around thumbtack stem thumbtack fully seated wood drop CyA will help keep tacks working loose Also soldering wires tacks will assure reliability materials cost box almost zero fact chances youll find thing need junk pile Lets get started Using drawing photos guide will probably find building box self-explanatory following con struction notes benefit begin ners hobby sides bottom well T 1 cut 34-in pine Use %-in pine T2 size unavailable may substi tute freely4-in plywood would work fine used -in Masonite cover plates again may substitute will Remember goal zero cost Using tin snips cut strip 1 x 514 coffee can something similar finger-spring plate Cut out triangles make finger springs Using small nail punch corners spring plate shown mounting screws Try get holes far corners possi ble screw heads wont interfere battery cells later will using small wood screws sheet metal screws mount plate 3-56 screw commonly used mount Cox 049 engine appropriate size need adjust fit further drilling first clamp sheet metal work sur face another board top barely expos ing screw hole Holding hand attempting drill sure way flict injury Sand shiny surface until clean sand painted surface remove paint areas adjacent screw holes Bend fingers up 14 adhere two small squares double-sided foam tape underside act spring helpers wish may glue kind rubber substitute foam tape Measure 34 in side box bottom draw two lines Separate 24-in length heavy lamp cord two Continued page 176 December 1989 73 Above The finger spring plate centered bottom box shown attached two small wood screws Note position lamp cord right side photo Right Sides box glued backplate/bottom assembly using D-size dry cells playing card thin sheet cardboard allow proper amount looseness Note cord exiting right Left two top pieces simply centered glued together top screws should fit top loosely thread snugly sides Right Using dry cells piece carbon paper transferring agent easy mark top contact point positions monthly publication covering International RC Soaring Scene US $17 yr 21/yr lstCiass Canada/Mexico S22/yr US funds Asia & Pacific $28/yr US funds Europe UK $28/yr US funds Surface Mall Foreign $18/yr US funds RO SOARING DIGEST PO Box 1079 Payson AZ 85547 before covering silk permits silk stretched tight dramatically re duces amount dope absorbs result very taut double covering relatively impervious changes temper ature moisture enhances torsional rigidity wing wing tips should tissue covered As stabilizer apply least three coats nitrate dope wing plus fuelproofer inboard panels Set wing aside allow cure thoroughly right inboard wing panel should have / washin Fin Cut part A-in soft balsa sheet outline shown plan Carve sand streamlined shape indicated Fuselage Select four /6 x 3A6 straight grained spruce strips longerons Carve triangular shape starting about 3 aft Section indicated plan Cut two fuselage sides /6 soft sheet balsa Pin side over plan glue longerons Insert %-in balsa bulkheads just forward aft pylon spacing shown plan Remove first fuselage side plan glue shaped longerons second side longerons dry tach side bulkheads making sure doing entire fuselage prop erly aligned Select sheet medium a fuselage bottom Sand smooth bottom two fuselage sides longerons con necting bulkheads glue entire assembly bottom sheet Pin entire structure flat surface desired Cut pylon very accurately hard %-in sheet balsa notch bulk heads glue firmly place Ensure perfectly vertical Sand smooth fuselage top attach /6 cover sheet along its entire length Glue 46 soft sheet pylon sides place Prepare wing stabilizer platforms shown plan Remove fuselage assembly plan dry Cut drill A-in ply wood firewall fit commercially available aluminum engine pans Install Electric Flight f Controller Perfect 05 Motors 510 cells LIghtweight 12 oo Adjustable switching pointmoney back Solderless tenninal easy hookup $2guarantee ON/OFF Controller495 Power save weight Very high efficiency O06V loss 20 5fre 22x13x63 Add 51ffl shippiog Colitorojo resideoto odd 65% $163 Too Send Chrek money order ooeooith11High Sky Fntaho comooto 3929 Kansas St #9 Otesooe San DlegocA 92104 blind mounting nuts epoxy firewall fuselage forward bulkhead shown plan File carve sand ward fuselage smooth configuration ensure clean junction engine mount Cover entire area fiber glass epoxy resin Sand balance fuselage smooth add wing stabilizer platforms Slot fuselage fin insert shown plan check alignment glue place Add %2 spruce dowel DT bands tubing ex ternal DT string Bend wing hooks /16 wire shown plan epoxy firmly place Sand smooth entire fuselage apply two coats clear dope Install engine DT timers normally apply two coats epoxy paint fuselage finish primarily because durable absolutely fuel-proof de sired however fuselage can tissue covered doped Ensure adequate fuel-proofing applied latter proce dure used original A-B Shrike used pressure fuel system illustrated plans photographs pen bladder pressure system can used preferred Install hot 15-23 size engine choice pre pare model flight testing Flight testing hot A-B model like Shrike first few test flights usually critical airplane passes crucible mishap remaining flights become easier Before attempting first test flight check model carefully proper align ment center-of-gravity location free dom warps test glide adjust plane necessary small increments packing under leading trailing edge stabilizer Hand glides should re veal slight right turn produced adjust ing stab tilt Once glide satisfactory ship ready its first power flight Set en gine timer three-second run start engine hand launch model gently wind about 450 el evation Climb should straight out angle launch slight right spiral observe tendency veer leftward climb correct immediately its generally fatal condition subsequent test flights increase length engine run flight pattern safety mention intestinal forti tude permit models gen eral design have required about %2 left rudder tab keep tail down during climbout /8 washin right board wing panel helps keep latter up during ascent word caution using Shrike interchangeably classes B repeat test procedure upon switching engines Nothing affects Shrikes climb pattern drastically major changes power ergo speed Unless abso lutely certain B engines have equal power output its prudent few short test flights after changing en gines full 9-to-12-second engine run model should make two full turns right during climb enter its glide pattern no stall loss altitude airplane built according plans flight patterns automatically will right-right Competition durability built shown ready-to-fly weight about 24 26 ounces opinion assuming hot engine used extra weight wont noticeably reduce performanceand rugged construction will carry model through several contest seasons Modelers limited building time simply prefer competing building will find Shrikes longevity great advantage risk being iconoclast offer suggestion enhance models du rability further minimize unnecessary testing Once wing stabilizer have aged model properly adjusted has proven competition-worthy little addi tional testing necessary Probably two three short DT flights before contest should suffice question philosophy will take moment recall folded wings damaged models lost Free Flight ships have expe rience traceable superfluous test flights think theyll concede point Battery Box/Render Continued page 73 wires strip 1/2 insulation end Placing spring plate equidistant between lines box bot tom mark mounting holes through wood sharp pencil photos shows spring plate position No tice uncut side opposite spring fingers approximately flush edge wood Drill pilot holes using 1A6 drill slight angle screw does split wood see drawing Mount spring plate screws trapping bared lamp cord under plate Its good idea 176 Model Aviation though optional roughen screw head wire sandpaper solder wire Glue box bottom backplate type wood glue used thick cyanoac rylate CyA speed Five-minute epoxy would also work well set glue two box sides place notch sidepiece goes over wire Use four battery cells piece thin cardboard playing card align sides proper width glue place dry remove cells glue other plate Center top T 1 over T2 drawing glue place Position top box drill pilot holes top screws Drill way through top side A-in drill remove top enlarge its holes /i6 Assemble tighten two 1 -in screws should fit top loosely thread side side screw holes should reinforced CyA because pines softness Using battery cells carbon paper let positive end cells mark con tact point location top Drill through top angle shown plan starting about / away center contact point emerging through top Strip 5 insulation other 24-in strand heavy lamp cord inch time Sand both undersides tops four thumbtacks clean paint Thread wire through hole top starting insulated end passing up through underside top Pull through until insulation flush hole contact side point twist bare wire nearest insulation around pin thumbtack press center carbon mark next three thumbtacks cut off excess wire Again soldering optional recommended Tape wires together enough slack easily open box tape again four inches Add fa vorite glow plug clip soldering no problem buy small two-pronged malewith-female plug Radio Shack similar retailer solder cord female side closer battery box carrying battery box field box flying sessions sure separate plug avoid shorting clip metal objects Switches advisablethe on/off positions can some times confused creating starting prob lems cant solder put clip small heavy plastic bag close baggie tie transit Its good idea paint exterior new box fuel-proof paint may have available short order box will look mess dry install battery cells tighten screws firmly compress springs get good broad contact couple extra notes seem order An December 1989 177 THE WORLDS FINEST SMALL ENGINES Lb easier approach would simply tape four D cells together roughen sol der leads parallel beauty box though cells low can simply stop corner store way field pop four new cells go flying Keep cord length 24 inches Too long cord causes higher resistance weaker glow shorter battery life think youll surprised much easier fun life flying field can consistently quick hot starts using fresh 15-volt dry cells FF Duration/Murphy Continued page 75 tions now handling Don Ross fine book Rubber-Powered Model Airplanes Copies $12 postpaid NFFS members$14 nonmem bers would make fine gift Rubber en thusiast novice expert alike Tips tabloids Wasatch Flyer news letter credits complement Jay Jack son experimenting new Satellite JETS FAN FUNFLY PILOTS CHOICE AWARDS TOP DUN EVENT HELICOPTER NOVICE INTER MEDIATE FAI SCALE Itched Irformance system TOP PERFORMANCE K&B ENGINES AirplaneManne K&B FUELS K&B GLOW PLUGS 9 Blends4 Choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B MIcro-BSIIoSSS FILLER K&B SUPER POXY RESIN K&B SUPER POXY THINNER K&B SUPER POXY PRIMER K&B SUPER POXY PAINT K&B MIXING CUPS City User Friendly Odorless UFO Hot Stuff cy anoacrylate CyA cement covered sheeted portion model 7-oz/sq-yd fi berglass cloth using thin UFO found io add considerable strength very little weight gain En contrast found standard thin CyA unsatisfactory purpose its very low viscosity allows penetrate wood too read ily thereby adding excessive weight Also UFO seemed permit little working time filled weave cloth much better Jay also recommends PlC Skin Shield hand protection working CyA other types hazardous materials modelers use abuse Since normal CyA cements raise havoc sinuses jumped UFO stuff hit hobby shop shelves bit disappointed experienced limited reten tion depending its use Jay Jacksons applica tion intriguing suggests some merit may due odorless option after Jay also supplied chart weights dif ferent brands fuel shutoffs made up process selecting satisfactory timer new /2A model Since recently gone through similar study own purposes listing caught eye Jays chart reads fol SCALE AMA SPORT SCALE SPORTSMAN ESPERT GIANT SCALE PATTERN NOVICE SPORTSMAN ADVANCED MASTERS iNS PAl RACING FORMULA 1 1/4 MIDGET SPORT PYLON RITETUESDAYWEERERDAYTHURSDAYFRIDAYRATURDAYRURDAYMORDAY DEC 2R1h DEC 215DEC ZRIRDEC 255DEC SUMDEC SIMJAN lEt PATTERNPATTERNPATTERN114 MIDGET C ALL ALL RACINGSPORTFORMULA ACLASSESCLASSESCLASSES NIGHTPVLON RACING CBANQUET D SCALE STATICSCALEJETSJETS AJUDGING D RW HELl HELl RECDPTERSCOPTERS EL EDO FEE FOR FIRST EUENT 1525 IF POSTMARKED PRIOR TO NDVEMRER iStil El FOR EACH ADDITIONAL EVENT NIGHT FLV iO IF ADDITIONAL EVENTI SANDUET PERUONFOR INFORMATION ONLY SEND SAME THE REMOTE CONTROL ASSOCIATION OF CENTRAL FLORIDA PRESENTS THE WORLDS LARGEST INDEPENDENT RADIO CONTROL COMPETITION THE 22nd ANNUAL RUNWAY fAN6EIUNE DECEMBER 2R iRES ARY 1 ISH ES 1ST RAT ID N/IN PO S C C BOA 948213 MAITLAND FL 521946213