Cricket

NO OCR TEXT NO OCR TEXT model design cowl old-timers small opposed-cylin der engines mounted high firewall cowling situation fairly easy engine Fike B Harle quin has two Harley Davidson motor cycle cylinders crankcase designed Les Long duplicate high location firewall model engine has mounted upside down 900 upright have seen problems inverted model engines avoid configu ration like plague choice mount engine horizontally standard mufflers will work Du-Bro Slimline similar will learned neat trick working Lou Proctor two firewalls better model built front former acting firewall whole cowl engine muffler ar ranged another firewall attaches first 4-40 machine screws decision blessing disguise first cowl discarded because Len lae Cockpit door allows easy access radio gear rear curve fuel tank exposed allowing observation wnuue Tilling Bezel Instrument panel cross sections cut various sizes brass tubing Right Silmilne muffler fits neatly alongside cowl throttle pushrod convenience passes under fuel tank has large Z-bend connecting throttle arm Left Trexier wneeis resemble wheels used old Model B Pike inspiration Cricket landing gear wire plans will fit both 3-and 31/2in Trexiers hubs different cut landing gearto size needed Right La screwed outer ends wing struts must doubled size small pieces inner pushrod material theywili fit securely under nylon landing gear clamps Before painting ends strut wrapped heavy thread sealed 5-mm epoxy 102 Model Aviation Airfoil old standby 15% Clark Y 8-in chord 48-in span means has aspect ratio 61 Atthe prototypes48-oz weight wing loading 1802/sq ft Engine installed lean 08 2Otwo-stroke Bymovingthe cowl ring forward slightly 2Ofour-stroke engine would excellent choice power plant photographs author Left A standard nylon tall wheel bracket attached triangular 1/a-ln plywood platform fuselage bottom carries 1-in Ace tall wheel radio antenna allowed dangle plane flight Going through fuselage antenna wire Inside plas tic tube old roil-up window shade Right Latches cockpit door smell pieces plastic screwed place latch turned engine cowl shown first author discarded aesthetic reasons Drill wheel hubs 5/32 bit insert 5/32 brass tubing bearing surface Add 1/s-in wheel locks remove excess length gear wire Left Spaces between stringers aft deck filled 3/16 soft balsa beforerounding deck Formers scalloped between stringers prevent covering bulging Note crossed diagonals top bottom Right can see method used attaching struts both wing fuselage Heavy thread wrapped around ends strut prevent splitting just didnt like lines make new firewall move engine up new cowl Without two-firewall situation would have build whole new fuselage re mainder model standard con struction except doubled -in ply center wing rib Wing Since like build fuselages usually start wing save best until last First decide whether will want ailerons will have threechannel ship cut out kit parts Cut out wing ribs Get some Sig pre-shaped 3/4 x %-in leading edge LE stock local hobby shop no pre-shaped tralling edge TE stock use two Ys x 1-in pieces light balsa have power saw TE pieces can ripped out just minutes otherwise plane sandpaper will fine job spars relatively hard -in-sq balsa Chances have enough -in ply scrap box center rib doublers side strong center rib will anchor point attaching wing fuselage will need enough 1/16 aircraft plywood make two di hedral braces finished shaping TE stock cut indentations rib ends taped three thicknesses hacksaw blades together saw notches conjunction depth gauge Notches made way will take 3/ rib very snugly small drop cyanoacrylate glue CyA will anchor firmly rib positions wing ailerons same use ailerons outboard ribs have modified accordingly either case bottom spar fastened workbench trailing edges ribs will fit snugly TE notches CyA ribs spar place Glue top spar CyA glue center rib time Pin LE tight against rib fronts add drop CyA joint wing finished following three-channel wing ailerons building aileron wing read over proceed finished wing own manner Cut strut anchors -in Lite Ply glue forward ones place epoxy aft short spars will have notched bottom outboard wing ribs indicated plans anchor epoxied between two ribs tight against short spar pictures note strut anchor blocks May 1q87 103 view shows ends cabana struts fabricated Former P-3 must set back allow rear cabne clear cockpit door hinge isa piece brass copper tubing epoxied bottom edge music wire passing through tubing side short spar accident front block epoxied wrong side too late remove discovery made stays Dont careless Use sanding block bevel ends spars LE TE two halves will fit together exactly tip blocked up 2 block up 1 wing ailerons Zona Saw remove first /16 injust behind spar first rib outboard center Slip di hedral brace space epoxy-glue using clamps hold tight against spar cured remove 1/16 vertically same two ribs just forward spars epoxy-glue another dihedral brace slot Add V16 webbing forward side spars out wing tips Double center rib -in ply shown plans Cut length epoxy center wing tip ribs made /6 balsa Put diagonal braces corners Sand everything c&efully wing now ready covering tail assembly construction com pletely standard Everything built 46 stock widths per plans joiner between two elevator halves made %4 piano wire epoxied grooves cut forward edge elevator Fuselage Cut formers ply per plans No 1 former -in aircraft ply second former landing gear attached /16 aircraft ply firewalls Bend landing gear -in piano wire affix former No 2 four nylon landing gear clamps Cover plans wax paper construct left side fuselage longerons 6-sq spruce frame cockpit door Station Nol 3just aft cockpit also spruce other vertical diagonal members 3/16-sq balsa glue has completely set up remove pins apply V32 ply skin firewall aft former just behind cockpit Duplicate right side except cockpit door please make sure have left right fuselage Drill holes A2 ply skin landing gear Slide side over landing gear wires until flush against former No 2 Add glue erect upside down over top view plans Pin place making sure everything vertical Quickly add former No 1 glue tape place Allow glue dry thoroughly Add two cross braces station No 3 bottom line vertical components top is own width rear station No 3 will allow cabane strut tQ fasten directly side fuselage station No 3 braced rear first turtledeck former Bend two sides together tail end H WING STRUT ANCHORAVSRSRJSIC WIREINNER GOLD N PLO K bORING INBOARD H w AILERON WING S DIHEDRAL FTUROTTLERUDDER IRPL UTOP LHOTTOM I-/ ALUMINUM WING STRUT YR RALGA PLANKINGANEDOR REND ENDS AD DOABLE ROTO SIDES FIREWALLWITU IR &C PLOEAR LEG GUSHED 3IRAC PLOFRONT LEG Fl SOLID lINAC PLO ______ ______ 3132WIRECIG IIRAdC PLO USD0 ENGINE lU HOAFT ROAST FJ COWL RING LOR*C PLO 441RjIj II OR DARRO TANK Fl- TING LINE--'K LAGESIED 113ZPLO 1132 PLO RDTTERTENDS HERE REORRIGUT SIDE AIRTUONICS TREOLEU 3-lIZ WHEELS Taper wood glue together Install top bottom cross braces diagonals Cut turtledeck form ers -in medium balsa Transfer location marks longerons edges balsa formers Glue formers place glue thoroughly dry check location marks straight edge former does touch straightedge little sanding will have done notch lines straight line cut notches Slip longerons place checking straightness eye glue place rear end turtledeck some longerons will have notched bottom side will fair place fillers between longer ons turtledeck individually cut fitted pieces -in soft balsa Build platform -in sheet balsa between formers No 1 No 2 upon tank will rest Put tank position run silicone tubing extend about 4 beyond former No 1 holes tubing must above side engine mount sure tank location check see can removed through cutout former No 2 everything OK pad tank foam plank cowl front cockpit used -in-wide strips -in sheet balsa planking Start 104 ModelAviation Full-Size Plans Available. See Page 186 DIHEDRAL BRACE MAKE Tif AS/BIIII S LOCATOANSIIII II~IIR BALSA RON WiNGTUSTACIY 4 4 SQ HARD BALSA I/H PLY RIB 3/32BALSA VRPLY RIB YE 3/8 HI BSLSA ~ ILI/ASS BALSA3/ORALS7 3 CAAHHEL WINS 5 DIHEDRAL BALSA I/B PLY WINDSCREEN -P3 BU OS SE RON S / / / 3/IHH 1/2 I/IHBALSA ---Th zzz BALSA K I/R MUSIC WIRE 3/32 ALSA IA 3/32 BALSA 2 3/10 RALS I/B A/C PLY S/16H 3/B BALSA 3/ IS 55 RUDDER CRASS RH AC E MADE N AlOOF LINE 3/32 HUSIC WIRE 3/IH 55 7 5I T 0 S 2 3 L 50005 WINO STOUT 3/BS I/A SPRUCE I/ASO SPLITS HEISFUHEE WITH ULURINUM CRICKET DES ANEO THAWS NOES HY PAUL F DESSAS II 0IU3A S S spruce longerons work top center side center strip fitted last makes feel better cowl can rough-sanded now hold off final sand ing until cowl etc position everything faked together Its time build separate firewall mounting engine building cowl around Attach engine mount firewall 4-40 machine screws blind mounting nuts As soon blind nuts set back firewall reverse screws stick out back side about 32 locate firewall against former No 1 Make sure register squeeze together machine screws will leave indentations face former No 1 Enlarge indentations about eter Vi6 deep Dremel cutter does fine job indentations will receive blind nuts two surfaces will fit together flat Put two surfaces back register check see firewall V32 smaller around former No 1 two surfaces together drill holes firewall fuel tubing Also drill four holes blind nuts screws will hold two surfaces contact Put blind nuts rear side No 1 former through bottom Add bottom skin former No 1 aft station No 3 Build cowl ring -in aircraft plywood fasten choice engine engine mount Screw down mount tight firewall Cut two pieces -in Lite Ply about 3 long Place firewall workbench erect strips top curve flat bottom such manner will support cowl ring prop drive washer should stick out through hole cowl ring about everything level square epoxy cowl ring supports place epoxy has hardened erect two support strips side making sure equally spaced side cowl parting line Once two set up attached bottom edge May1987 105 times have patience beveled cowl ring firewall sanding block cowl covering 2 aircraft plywood would glue flush both Cut piece heavy paper pattern plans top cowl skin Drape over top cowl see fits small amount sticking out fore aft sides paper should exactly split side cowl ring support braces Using paper pattern cut piece z aircraft ply match soaked ply hot water few minutes formed around top cowl everything fits well glue place used clamps protector strips fasten edges cowl skin cowl ring supports contact must absolutely flat will match bottom pieces cowl skin Three pieces sets must made cabane struts wing struts under fuselage strut anchor strut anchor a -in strip aluminum long enough stick out fuselage Drill holes ends strip couple holes under fuselage through anchor screws pass hold itm place cabane struts little dif ficult Cut four pieces -in brass tubing 1 long Also cut four pieces %4 brass tubing shorter pieces doublers strengthen outer ends longer pieces Slide flush place tubing vise squeeze flat Bend two pieces 5/ piano wire shapes given plans legs front cabane longest Place squeezed-flat end brass tubing back vise Insert leg piano wire open end tubing bend until lambda upside down V vertical Remove fitting vise insert another Put other leg cowl ring should removed ease engine installation removal Take off engines prop washer needle valve building model engine going out great number times make easy yourself As engine becomes more closed discovered has removed engine mount reinstalled engine cowl compiete unit made separately fuselage attached firewall fourAilen-head machine screws blind mounting nuts cowl exterior 1/32 aircraft plywood assembled three pieces Doublers back up ply parting lines cutout side should made match particular choice engine radio compartment size adequate flight gear battery placed beneath receiver slot tank compartment floor throttle pushrod passes through way engine filler between stringers rear deck shaped sandpaper wrapped around wooden dowels various diameters Note extension bottom vertical fin does show plans leading edge stabilizer rounded elevators tapersanded LE TE front deck pieces cut 1/s x1/s-in balsa piece beveled Build bottom up side adding center piece last Sand round shape open end bend until lambda vertical same rear cabane wire cleaned fine sand paper soldered pieces brass tubing Drill two holes flattened end large enough pass 2-56 machine screw Erect two cabane struts above cockpit careful 2-56 screws will pass through spruce add washer nut pull up tight wing struts made Y16-inthick spruce strips e bottom end saw slot fine saw Insert piece sheet aluminum slot File off surplus around edges epoxy place outer ends drilled small L-shaped cup hooks local hardware store cut short pieces inner Gold-N-Rod squeezed outer end L hook bring diameter up drilled lower end wing struts match hole underfuselage anchor 2-56 machine screw lock washer nut holds position upper ends inserted landing gear clamps screwed anchor blocks outer portion wing good idea fully assemble skeleton plane point will make things easier covering screw holes will already place Note location two landing gear clamps called out plans located underside wing Drill holes bottom doubled -in wing rib two clamps Insert screw holes tighten clamp almost bottom wing rib same other Turn wing upside down turn fuselage sideways across wing clamps looped over sides cabane struts Insert second screws pull clamps uptight Since clamps wire Y64 wire will slide through clamp turn corner wing sitting atop cabanes Turn everything over sit plane its landing gear Add wing struts Fasten fuselage anchor tuck L-hooks landing gear clamps added anchors built outer portion wing Wing alignment two front struts will determine dihedral two back struts will determine washout Sit plane workbench wheels tail propped up fuselage level able get L hooks landing gear clamps un doubtedly will difference distance workbench up wing tip side Measuring workbench up front corner wing tips adjust turning out L-hooks distance same wingtip measured distance leading edge trailing edge root rib difference measurement taken wing tip trailing edge corner much lower leading edge corner will assure no warp wing Leave wing flat until covered time will put washout rear wing spar will lengthened take washout consideration Pin tail surfaces place fit pushrods servos way elevator rudder horns will easier locate tail assembly covered Covering built three channels out ailerons washout wing neces sary center section wing should stall washout tips will still lifting wing stalls wash out whole wing stalls very dangerous maneuver called tip stall will occur disastrous happens plane close ground landing example Washout put after wing has covered film choice first putting -in block under outboard trailing edge corner holding center wing flat work bench will cause diagonal wrinldes form plastic material Iron out wrinkles shrink covering wing Hold wing position until covering cools bottom covering should ironed flat trying warp top covering will hold washout position Final washout plane should approximately pecial covering advice tail surfaces standard fuselage longer width plastic covering films Cover pieces First cover turtledeck top fuselage Cover cowl what cut off piece Cover bottom two pieces Start end ply skin overlap Y16 cover tail Come back another piece cover Continued page 185 Only covering remains prototypes case white MonoKote dark blue Trim MonoKote Engine cowi painted white match Windshield fabricating tip Cut 3/8-in white strip thetop oleo butter container RC 56 Wilhoid glue affix strip over bottom windshield dry trim shape strip will hold windshield ins gentle curve author used three small pins attach com bination forward deck applied drop cyanoacrylate pin location Model B Fike 1936 Long-Harlequin engine provided inspiration Cricket model its easyto seethe similarities Picturewastaken old EAA Museum -ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS 4-M Company10 AMA MembershiploS Academy Aviation R&D180 Ace Radio Control8 39 Aerodrome Models Ltd178 Aerospace Composite Products49 Airtronics2 AI-Tec & Su-Pr-Line Prod154 Altech MarketingCover 3 American Jr Aircraft Co146 Applied Design Corp18 Astro Flight4 Authorized Radio Control Service36 Avio99 Quay Barber Models64 Blue Ridge Machinery & Tools159 Bolar Heli Resesarch178 Bradley Products16 Dave Brown Products47 Bru Line lncustries39 Byron Originals9495 Campbell Tools Co178 Carolina-Taffinder49 Johnnle Casburn Mfg12 Champion Models53 Cheveron177 Cleveland Model Supply20 Eric Clutton178 Coverite35 91 Cr, Hobbies49 Electronics10 51 146 53 I22 174 164-169 17 adlo51 C5 154 55 34 19 a177 51 23 171 13 Helicopters Unlimited11 HighSky178 Harry B Higley & Sons55 Historic Aviation37 Hobby Barn148-149 Hobby Horn16 Hobby Lobby International151 Hobbypoxy Products171 Hobby Woods4 Ikon Northwest Co180 Indy RO Sales Inc156-158 JC Development Co159 JTec184 Larry Jolly Model Products179 Jomar183 K&BMfg183 K&S Engineering36 K W Enterprises178 Kraft Midwest18 Kustom Kraftsmanship146 Kyosho88 Lake Enterprises172 Leisure Electronics147 EldonJLind 9o171 Lone Star Models16 MACS Products172 Matrix Enterprises Inc18 Matts Model Airplanes53 McDaniel RC Service uvia McDougal Design Co Bruce Meeson Publishing Messers Quality Model Produc Micro Mark Micro Model Engineering Micro-X- Products Model Expo Model Rectifier Corp Sid Morgan Plans Mutchlers Hobbies Navitlus Industries Northeast Aerodynamics 0S Engines PK Products Pacer Technology 0 172 Paper Airplanes Intl Pelican Enterprises Penn International ChemicalsZenith Penn Valley Hobby CenterNick Z Pica Products Polks Hobby Progress Mfg Co Pro-Tune Corp QSPRA Qantas RC Extras Radio South Rays Hobby Red Max Fuel Repla-Tech lnterntional Roamin Research Roush Manufacturing S&D Model Products SR Batteries STM Sachs hv TG bermiectors ShImports Sh Try Electric Youll like nothing like Electric Elation responding advertisers mention read about Model Aviation Cricket/Denson Continued page 107 bend around front former No 1 about Coat whole front former epoxy cowl Cricketwas painted white enamel gave two coats primer two coats gloss white Finally applied coat clear Dont forget back firewall needs fuel-proofing just much rest plane paint struts rear ends pushrods landing gear cabane struts hubs Trexler wheels painted inside cockpit two coats flat black paint Should decide include cockpit hatch will go long way toward dressing up plane hatch cover overlaps side flush top cut 1/32 aircraft plywood frame inside made -in-sq balsa will make flush inside fuselage found length 1/16 OD copper tubing hobby shop through ran piece music wire SAFE FLYING IS NO ACCIDENT May1987 185 55 A7 bottom forward sides done exactly same way Allow covering Now Sullivans BaldNiilevis fills missinq link past push rods clevis purchased separately Now Sullivan Products completes connection combining famous Gold-N-Rod togetherwith newest product Gold-N-Clevis package Designed especially Gold-N-Rod Sullivans Gold-N-Clevis fills missing link quality push rod connections What sets clevis apart its spring steel retaining clip wont allow Gold-N-Clevis open under heavy use welded center pin adds extra strength rolled threaded collar its interlocking seam cannot separate yet still allows accurate adjustment 2/56 threaded rods Sullivans clevis brass-plated allowing solder place Gold-N-Clevis proudly made USA now available sepa rately part Gold-N-Push Rod kit dealer near 7AFFt5WPi 7OEV1Z PRODUCTS North Haven Street O PO Box 5166 Baltimore MD 21224 732-3500 fly near onerhead elect nc power lines 188 Model Aviation

NO OCR TEXT NO OCR TEXT model design cowl old-timers small opposed-cylin der engines mounted high firewall cowling situation fairly easy engine Fike B Harle quin has two Harley Davidson motor cycle cylinders crankcase designed Les Long duplicate high location firewall model engine has mounted upside down 900 upright have seen problems inverted model engines avoid configu ration like plague choice mount engine horizontally standard mufflers will work Du-Bro Slimline similar will learned neat trick working Lou Proctor two firewalls better model built front former acting firewall whole cowl engine muffler ar ranged another firewall attaches first 4-40 machine screws decision blessing disguise first cowl discarded because Len lae Cockpit door allows easy access radio gear rear curve fuel tank exposed allowing observation wnuue Tilling Bezel Instrument panel cross sections cut various sizes brass tubing Right Silmilne muffler fits neatly alongside cowl throttle pushrod convenience passes under fuel tank has large Z-bend connecting throttle arm Left Trexier wneeis resemble wheels used old Model B Pike inspiration Cricket landing gear wire plans will fit both 3-and 31/2in Trexiers hubs different cut landing gearto size needed Right La screwed outer ends wing struts must doubled size small pieces inner pushrod material theywili fit securely under nylon landing gear clamps Before painting ends strut wrapped heavy thread sealed 5-mm epoxy 102 Model Aviation Airfoil old standby 15% Clark Y 8-in chord 48-in span means has aspect ratio 61 Atthe prototypes48-oz weight wing loading 1802/sq ft Engine installed lean 08 2Otwo-stroke Bymovingthe cowl ring forward slightly 2Ofour-stroke engine would excellent choice power plant photographs author Left A standard nylon tall wheel bracket attached triangular 1/a-ln plywood platform fuselage bottom carries 1-in Ace tall wheel radio antenna allowed dangle plane flight Going through fuselage antenna wire Inside plas tic tube old roil-up window shade Right Latches cockpit door smell pieces plastic screwed place latch turned engine cowl shown first author discarded aesthetic reasons Drill wheel hubs 5/32 bit insert 5/32 brass tubing bearing surface Add 1/s-in wheel locks remove excess length gear wire Left Spaces between stringers aft deck filled 3/16 soft balsa beforerounding deck Formers scalloped between stringers prevent covering bulging Note crossed diagonals top bottom Right can see method used attaching struts both wing fuselage Heavy thread wrapped around ends strut prevent splitting just didnt like lines make new firewall move engine up new cowl Without two-firewall situation would have build whole new fuselage re mainder model standard con struction except doubled -in ply center wing rib Wing Since like build fuselages usually start wing save best until last First decide whether will want ailerons will have threechannel ship cut out kit parts Cut out wing ribs Get some Sig pre-shaped 3/4 x %-in leading edge LE stock local hobby shop no pre-shaped tralling edge TE stock use two Ys x 1-in pieces light balsa have power saw TE pieces can ripped out just minutes otherwise plane sandpaper will fine job spars relatively hard -in-sq balsa Chances have enough -in ply scrap box center rib doublers side strong center rib will anchor point attaching wing fuselage will need enough 1/16 aircraft plywood make two di hedral braces finished shaping TE stock cut indentations rib ends taped three thicknesses hacksaw blades together saw notches conjunction depth gauge Notches made way will take 3/ rib very snugly small drop cyanoacrylate glue CyA will anchor firmly rib positions wing ailerons same use ailerons outboard ribs have modified accordingly either case bottom spar fastened workbench trailing edges ribs will fit snugly TE notches CyA ribs spar place Glue top spar CyA glue center rib time Pin LE tight against rib fronts add drop CyA joint wing finished following three-channel wing ailerons building aileron wing read over proceed finished wing own manner Cut strut anchors -in Lite Ply glue forward ones place epoxy aft short spars will have notched bottom outboard wing ribs indicated plans anchor epoxied between two ribs tight against short spar pictures note strut anchor blocks May 1q87 103 view shows ends cabana struts fabricated Former P-3 must set back allow rear cabne clear cockpit door hinge isa piece brass copper tubing epoxied bottom edge music wire passing through tubing side short spar accident front block epoxied wrong side too late remove discovery made stays Dont careless Use sanding block bevel ends spars LE TE two halves will fit together exactly tip blocked up 2 block up 1 wing ailerons Zona Saw remove first /16 injust behind spar first rib outboard center Slip di hedral brace space epoxy-glue using clamps hold tight against spar cured remove 1/16 vertically same two ribs just forward spars epoxy-glue another dihedral brace slot Add V16 webbing forward side spars out wing tips Double center rib -in ply shown plans Cut length epoxy center wing tip ribs made /6 balsa Put diagonal braces corners Sand everything c&efully wing now ready covering tail assembly construction com pletely standard Everything built 46 stock widths per plans joiner between two elevator halves made %4 piano wire epoxied grooves cut forward edge elevator Fuselage Cut formers ply per plans No 1 former -in aircraft ply second former landing gear attached /16 aircraft ply firewalls Bend landing gear -in piano wire affix former No 2 four nylon landing gear clamps Cover plans wax paper construct left side fuselage longerons 6-sq spruce frame cockpit door Station Nol 3just aft cockpit also spruce other vertical diagonal members 3/16-sq balsa glue has completely set up remove pins apply V32 ply skin firewall aft former just behind cockpit Duplicate right side except cockpit door please make sure have left right fuselage Drill holes A2 ply skin landing gear Slide side over landing gear wires until flush against former No 2 Add glue erect upside down over top view plans Pin place making sure everything vertical Quickly add former No 1 glue tape place Allow glue dry thoroughly Add two cross braces station No 3 bottom line vertical components top is own width rear station No 3 will allow cabane strut tQ fasten directly side fuselage station No 3 braced rear first turtledeck former Bend two sides together tail end H WING STRUT ANCHORAVSRSRJSIC WIREINNER GOLD N PLO K bORING INBOARD H w AILERON WING S DIHEDRAL FTUROTTLERUDDER IRPL UTOP LHOTTOM I-/ ALUMINUM WING STRUT YR RALGA PLANKINGANEDOR REND ENDS AD DOABLE ROTO SIDES FIREWALLWITU IR &C PLOEAR LEG GUSHED 3IRAC PLOFRONT LEG Fl SOLID lINAC PLO ______ ______ 3132WIRECIG IIRAdC PLO USD0 ENGINE lU HOAFT ROAST FJ COWL RING LOR*C PLO 441RjIj II OR DARRO TANK Fl- TING LINE--'K LAGESIED 113ZPLO 1132 PLO RDTTERTENDS HERE REORRIGUT SIDE AIRTUONICS TREOLEU 3-lIZ WHEELS Taper wood glue together Install top bottom cross braces diagonals Cut turtledeck form ers -in medium balsa Transfer location marks longerons edges balsa formers Glue formers place glue thoroughly dry check location marks straight edge former does touch straightedge little sanding will have done notch lines straight line cut notches Slip longerons place checking straightness eye glue place rear end turtledeck some longerons will have notched bottom side will fair place fillers between longer ons turtledeck individually cut fitted pieces -in soft balsa Build platform -in sheet balsa between formers No 1 No 2 upon tank will rest Put tank position run silicone tubing extend about 4 beyond former No 1 holes tubing must above side engine mount sure tank location check see can removed through cutout former No 2 everything OK pad tank foam plank cowl front cockpit used -in-wide strips -in sheet balsa planking Start 104 ModelAviation Full-Size Plans Available. See Page 186 DIHEDRAL BRACE MAKE Tif AS/BIIII S LOCATOANSIIII II~IIR BALSA RON WiNGTUSTACIY 4 4 SQ HARD BALSA I/H PLY RIB 3/32BALSA VRPLY RIB YE 3/8 HI BSLSA ~ ILI/ASS BALSA3/ORALS7 3 CAAHHEL WINS 5 DIHEDRAL BALSA I/B PLY WINDSCREEN -P3 BU OS SE RON S / / / 3/IHH 1/2 I/IHBALSA ---Th zzz BALSA K I/R MUSIC WIRE 3/32 ALSA IA 3/32 BALSA 2 3/10 RALS I/B A/C PLY S/16H 3/B BALSA 3/ IS 55 RUDDER CRASS RH AC E MADE N AlOOF LINE 3/32 HUSIC WIRE 3/IH 55 7 5I T 0 S 2 3 L 50005 WINO STOUT 3/BS I/A SPRUCE I/ASO SPLITS HEISFUHEE WITH ULURINUM CRICKET DES ANEO THAWS NOES HY PAUL F DESSAS II 0IU3A S S spruce longerons work top center side center strip fitted last makes feel better cowl can rough-sanded now hold off final sand ing until cowl etc position everything faked together Its time build separate firewall mounting engine building cowl around Attach engine mount firewall 4-40 machine screws blind mounting nuts As soon blind nuts set back firewall reverse screws stick out back side about 32 locate firewall against former No 1 Make sure register squeeze together machine screws will leave indentations face former No 1 Enlarge indentations about eter Vi6 deep Dremel cutter does fine job indentations will receive blind nuts two surfaces will fit together flat Put two surfaces back register check see firewall V32 smaller around former No 1 two surfaces together drill holes firewall fuel tubing Also drill four holes blind nuts screws will hold two surfaces contact Put blind nuts rear side No 1 former through bottom Add bottom skin former No 1 aft station No 3 Build cowl ring -in aircraft plywood fasten choice engine engine mount Screw down mount tight firewall Cut two pieces -in Lite Ply about 3 long Place firewall workbench erect strips top curve flat bottom such manner will support cowl ring prop drive washer should stick out through hole cowl ring about everything level square epoxy cowl ring supports place epoxy has hardened erect two support strips side making sure equally spaced side cowl parting line Once two set up attached bottom edge May1987 105 times have patience beveled cowl ring firewall sanding block cowl covering 2 aircraft plywood would glue flush both Cut piece heavy paper pattern plans top cowl skin Drape over top cowl see fits small amount sticking out fore aft sides paper should exactly split side cowl ring support braces Using paper pattern cut piece z aircraft ply match soaked ply hot water few minutes formed around top cowl everything fits well glue place used clamps protector strips fasten edges cowl skin cowl ring supports contact must absolutely flat will match bottom pieces cowl skin Three pieces sets must made cabane struts wing struts under fuselage strut anchor strut anchor a -in strip aluminum long enough stick out fuselage Drill holes ends strip couple holes under fuselage through anchor screws pass hold itm place cabane struts little dif ficult Cut four pieces -in brass tubing 1 long Also cut four pieces %4 brass tubing shorter pieces doublers strengthen outer ends longer pieces Slide flush place tubing vise squeeze flat Bend two pieces 5/ piano wire shapes given plans legs front cabane longest Place squeezed-flat end brass tubing back vise Insert leg piano wire open end tubing bend until lambda upside down V vertical Remove fitting vise insert another Put other leg cowl ring should removed ease engine installation removal Take off engines prop washer needle valve building model engine going out great number times make easy yourself As engine becomes more closed discovered has removed engine mount reinstalled engine cowl compiete unit made separately fuselage attached firewall fourAilen-head machine screws blind mounting nuts cowl exterior 1/32 aircraft plywood assembled three pieces Doublers back up ply parting lines cutout side should made match particular choice engine radio compartment size adequate flight gear battery placed beneath receiver slot tank compartment floor throttle pushrod passes through way engine filler between stringers rear deck shaped sandpaper wrapped around wooden dowels various diameters Note extension bottom vertical fin does show plans leading edge stabilizer rounded elevators tapersanded LE TE front deck pieces cut 1/s x1/s-in balsa piece beveled Build bottom up side adding center piece last Sand round shape open end bend until lambda vertical same rear cabane wire cleaned fine sand paper soldered pieces brass tubing Drill two holes flattened end large enough pass 2-56 machine screw Erect two cabane struts above cockpit careful 2-56 screws will pass through spruce add washer nut pull up tight wing struts made Y16-inthick spruce strips e bottom end saw slot fine saw Insert piece sheet aluminum slot File off surplus around edges epoxy place outer ends drilled small L-shaped cup hooks local hardware store cut short pieces inner Gold-N-Rod squeezed outer end L hook bring diameter up drilled lower end wing struts match hole underfuselage anchor 2-56 machine screw lock washer nut holds position upper ends inserted landing gear clamps screwed anchor blocks outer portion wing good idea fully assemble skeleton plane point will make things easier covering screw holes will already place Note location two landing gear clamps called out plans located underside wing Drill holes bottom doubled -in wing rib two clamps Insert screw holes tighten clamp almost bottom wing rib same other Turn wing upside down turn fuselage sideways across wing clamps looped over sides cabane struts Insert second screws pull clamps uptight Since clamps wire Y64 wire will slide through clamp turn corner wing sitting atop cabanes Turn everything over sit plane its landing gear Add wing struts Fasten fuselage anchor tuck L-hooks landing gear clamps added anchors built outer portion wing Wing alignment two front struts will determine dihedral two back struts will determine washout Sit plane workbench wheels tail propped up fuselage level able get L hooks landing gear clamps un doubtedly will difference distance workbench up wing tip side Measuring workbench up front corner wing tips adjust turning out L-hooks distance same wingtip measured distance leading edge trailing edge root rib difference measurement taken wing tip trailing edge corner much lower leading edge corner will assure no warp wing Leave wing flat until covered time will put washout rear wing spar will lengthened take washout consideration Pin tail surfaces place fit pushrods servos way elevator rudder horns will easier locate tail assembly covered Covering built three channels out ailerons washout wing neces sary center section wing should stall washout tips will still lifting wing stalls wash out whole wing stalls very dangerous maneuver called tip stall will occur disastrous happens plane close ground landing example Washout put after wing has covered film choice first putting -in block under outboard trailing edge corner holding center wing flat work bench will cause diagonal wrinldes form plastic material Iron out wrinkles shrink covering wing Hold wing position until covering cools bottom covering should ironed flat trying warp top covering will hold washout position Final washout plane should approximately pecial covering advice tail surfaces standard fuselage longer width plastic covering films Cover pieces First cover turtledeck top fuselage Cover cowl what cut off piece Cover bottom two pieces Start end ply skin overlap Y16 cover tail Come back another piece cover Continued page 185 Only covering remains prototypes case white MonoKote dark blue Trim MonoKote Engine cowi painted white match Windshield fabricating tip Cut 3/8-in white strip thetop oleo butter container RC 56 Wilhoid glue affix strip over bottom windshield dry trim shape strip will hold windshield ins gentle curve author used three small pins attach com bination forward deck applied drop cyanoacrylate pin location Model B Fike 1936 Long-Harlequin engine provided inspiration Cricket model its easyto seethe similarities Picturewastaken old EAA Museum -ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS 4-M Company10 AMA MembershiploS Academy Aviation R&D180 Ace Radio Control8 39 Aerodrome Models Ltd178 Aerospace Composite Products49 Airtronics2 AI-Tec & Su-Pr-Line Prod154 Altech MarketingCover 3 American Jr Aircraft Co146 Applied Design Corp18 Astro Flight4 Authorized Radio Control Service36 Avio99 Quay Barber Models64 Blue Ridge Machinery & Tools159 Bolar Heli Resesarch178 Bradley Products16 Dave Brown Products47 Bru Line lncustries39 Byron Originals9495 Campbell Tools Co178 Carolina-Taffinder49 Johnnle Casburn Mfg12 Champion Models53 Cheveron177 Cleveland Model Supply20 Eric Clutton178 Coverite35 91 Cr, Hobbies49 Electronics10 51 146 53 I22 174 164-169 17 adlo51 C5 154 55 34 19 a177 51 23 171 13 Helicopters Unlimited11 HighSky178 Harry B Higley & Sons55 Historic Aviation37 Hobby Barn148-149 Hobby Horn16 Hobby Lobby International151 Hobbypoxy Products171 Hobby Woods4 Ikon Northwest Co180 Indy RO Sales Inc156-158 JC Development Co159 JTec184 Larry Jolly Model Products179 Jomar183 K&BMfg183 K&S Engineering36 K W Enterprises178 Kraft Midwest18 Kustom Kraftsmanship146 Kyosho88 Lake Enterprises172 Leisure Electronics147 EldonJLind 9o171 Lone Star Models16 MACS Products172 Matrix Enterprises Inc18 Matts Model Airplanes53 McDaniel RC Service uvia McDougal Design Co Bruce Meeson Publishing Messers Quality Model Produc Micro Mark Micro Model Engineering Micro-X- Products Model Expo Model Rectifier Corp Sid Morgan Plans Mutchlers Hobbies Navitlus Industries Northeast Aerodynamics 0S Engines PK Products Pacer Technology 0 172 Paper Airplanes Intl Pelican Enterprises Penn International ChemicalsZenith Penn Valley Hobby CenterNick Z Pica Products Polks Hobby Progress Mfg Co Pro-Tune Corp QSPRA Qantas RC Extras Radio South Rays Hobby Red Max Fuel Repla-Tech lnterntional Roamin Research Roush Manufacturing S&D Model Products SR Batteries STM Sachs hv TG bermiectors ShImports Sh Try Electric Youll like nothing like Electric Elation responding advertisers mention read about Model Aviation Cricket/Denson Continued page 107 bend around front former No 1 about Coat whole front former epoxy cowl Cricketwas painted white enamel gave two coats primer two coats gloss white Finally applied coat clear Dont forget back firewall needs fuel-proofing just much rest plane paint struts rear ends pushrods landing gear cabane struts hubs Trexler wheels painted inside cockpit two coats flat black paint Should decide include cockpit hatch will go long way toward dressing up plane hatch cover overlaps side flush top cut 1/32 aircraft plywood frame inside made -in-sq balsa will make flush inside fuselage found length 1/16 OD copper tubing hobby shop through ran piece music wire SAFE FLYING IS NO ACCIDENT May1987 185 55 A7 bottom forward sides done exactly same way Allow covering Now Sullivans BaldNiilevis fills missinq link past push rods clevis purchased separately Now Sullivan Products completes connection combining famous Gold-N-Rod togetherwith newest product Gold-N-Clevis package Designed especially Gold-N-Rod Sullivans Gold-N-Clevis fills missing link quality push rod connections What sets clevis apart its spring steel retaining clip wont allow Gold-N-Clevis open under heavy use welded center pin adds extra strength rolled threaded collar its interlocking seam cannot separate yet still allows accurate adjustment 2/56 threaded rods Sullivans clevis brass-plated allowing solder place Gold-N-Clevis proudly made USA now available sepa rately part Gold-N-Push Rod kit dealer near 7AFFt5WPi 7OEV1Z PRODUCTS North Haven Street O PO Box 5166 Baltimore MD 21224 732-3500 fly near onerhead elect nc power lines 188 Model Aviation

NO OCR TEXT NO OCR TEXT model design cowl old-timers small opposed-cylin der engines mounted high firewall cowling situation fairly easy engine Fike B Harle quin has two Harley Davidson motor cycle cylinders crankcase designed Les Long duplicate high location firewall model engine has mounted upside down 900 upright have seen problems inverted model engines avoid configu ration like plague choice mount engine horizontally standard mufflers will work Du-Bro Slimline similar will learned neat trick working Lou Proctor two firewalls better model built front former acting firewall whole cowl engine muffler ar ranged another firewall attaches first 4-40 machine screws decision blessing disguise first cowl discarded because Len lae Cockpit door allows easy access radio gear rear curve fuel tank exposed allowing observation wnuue Tilling Bezel Instrument panel cross sections cut various sizes brass tubing Right Silmilne muffler fits neatly alongside cowl throttle pushrod convenience passes under fuel tank has large Z-bend connecting throttle arm Left Trexier wneeis resemble wheels used old Model B Pike inspiration Cricket landing gear wire plans will fit both 3-and 31/2in Trexiers hubs different cut landing gearto size needed Right La screwed outer ends wing struts must doubled size small pieces inner pushrod material theywili fit securely under nylon landing gear clamps Before painting ends strut wrapped heavy thread sealed 5-mm epoxy 102 Model Aviation Airfoil old standby 15% Clark Y 8-in chord 48-in span means has aspect ratio 61 Atthe prototypes48-oz weight wing loading 1802/sq ft Engine installed lean 08 2Otwo-stroke Bymovingthe cowl ring forward slightly 2Ofour-stroke engine would excellent choice power plant photographs author Left A standard nylon tall wheel bracket attached triangular 1/a-ln plywood platform fuselage bottom carries 1-in Ace tall wheel radio antenna allowed dangle plane flight Going through fuselage antenna wire Inside plas tic tube old roil-up window shade Right Latches cockpit door smell pieces plastic screwed place latch turned engine cowl shown first author discarded aesthetic reasons Drill wheel hubs 5/32 bit insert 5/32 brass tubing bearing surface Add 1/s-in wheel locks remove excess length gear wire Left Spaces between stringers aft deck filled 3/16 soft balsa beforerounding deck Formers scalloped between stringers prevent covering bulging Note crossed diagonals top bottom Right can see method used attaching struts both wing fuselage Heavy thread wrapped around ends strut prevent splitting just didnt like lines make new firewall move engine up new cowl Without two-firewall situation would have build whole new fuselage re mainder model standard con struction except doubled -in ply center wing rib Wing Since like build fuselages usually start wing save best until last First decide whether will want ailerons will have threechannel ship cut out kit parts Cut out wing ribs Get some Sig pre-shaped 3/4 x %-in leading edge LE stock local hobby shop no pre-shaped tralling edge TE stock use two Ys x 1-in pieces light balsa have power saw TE pieces can ripped out just minutes otherwise plane sandpaper will fine job spars relatively hard -in-sq balsa Chances have enough -in ply scrap box center rib doublers side strong center rib will anchor point attaching wing fuselage will need enough 1/16 aircraft plywood make two di hedral braces finished shaping TE stock cut indentations rib ends taped three thicknesses hacksaw blades together saw notches conjunction depth gauge Notches made way will take 3/ rib very snugly small drop cyanoacrylate glue CyA will anchor firmly rib positions wing ailerons same use ailerons outboard ribs have modified accordingly either case bottom spar fastened workbench trailing edges ribs will fit snugly TE notches CyA ribs spar place Glue top spar CyA glue center rib time Pin LE tight against rib fronts add drop CyA joint wing finished following three-channel wing ailerons building aileron wing read over proceed finished wing own manner Cut strut anchors -in Lite Ply glue forward ones place epoxy aft short spars will have notched bottom outboard wing ribs indicated plans anchor epoxied between two ribs tight against short spar pictures note strut anchor blocks May 1q87 103 view shows ends cabana struts fabricated Former P-3 must set back allow rear cabne clear cockpit door hinge isa piece brass copper tubing epoxied bottom edge music wire passing through tubing side short spar accident front block epoxied wrong side too late remove discovery made stays Dont careless Use sanding block bevel ends spars LE TE two halves will fit together exactly tip blocked up 2 block up 1 wing ailerons Zona Saw remove first /16 injust behind spar first rib outboard center Slip di hedral brace space epoxy-glue using clamps hold tight against spar cured remove 1/16 vertically same two ribs just forward spars epoxy-glue another dihedral brace slot Add V16 webbing forward side spars out wing tips Double center rib -in ply shown plans Cut length epoxy center wing tip ribs made /6 balsa Put diagonal braces corners Sand everything c&efully wing now ready covering tail assembly construction com pletely standard Everything built 46 stock widths per plans joiner between two elevator halves made %4 piano wire epoxied grooves cut forward edge elevator Fuselage Cut formers ply per plans No 1 former -in aircraft ply second former landing gear attached /16 aircraft ply firewalls Bend landing gear -in piano wire affix former No 2 four nylon landing gear clamps Cover plans wax paper construct left side fuselage longerons 6-sq spruce frame cockpit door Station Nol 3just aft cockpit also spruce other vertical diagonal members 3/16-sq balsa glue has completely set up remove pins apply V32 ply skin firewall aft former just behind cockpit Duplicate right side except cockpit door please make sure have left right fuselage Drill holes A2 ply skin landing gear Slide side over landing gear wires until flush against former No 2 Add glue erect upside down over top view plans Pin place making sure everything vertical Quickly add former No 1 glue tape place Allow glue dry thoroughly Add two cross braces station No 3 bottom line vertical components top is own width rear station No 3 will allow cabane strut tQ fasten directly side fuselage station No 3 braced rear first turtledeck former Bend two sides together tail end H WING STRUT ANCHORAVSRSRJSIC WIREINNER GOLD N PLO K bORING INBOARD H w AILERON WING S DIHEDRAL FTUROTTLERUDDER IRPL UTOP LHOTTOM I-/ ALUMINUM WING STRUT YR RALGA PLANKINGANEDOR REND ENDS AD DOABLE ROTO SIDES FIREWALLWITU IR &C PLOEAR LEG GUSHED 3IRAC PLOFRONT LEG Fl SOLID lINAC PLO ______ ______ 3132WIRECIG IIRAdC PLO USD0 ENGINE lU HOAFT ROAST FJ COWL RING LOR*C PLO 441RjIj II OR DARRO TANK Fl- TING LINE--'K LAGESIED 113ZPLO 1132 PLO RDTTERTENDS HERE REORRIGUT SIDE AIRTUONICS TREOLEU 3-lIZ WHEELS Taper wood glue together Install top bottom cross braces diagonals Cut turtledeck form ers -in medium balsa Transfer location marks longerons edges balsa formers Glue formers place glue thoroughly dry check location marks straight edge former does touch straightedge little sanding will have done notch lines straight line cut notches Slip longerons place checking straightness eye glue place rear end turtledeck some longerons will have notched bottom side will fair place fillers between longer ons turtledeck individually cut fitted pieces -in soft balsa Build platform -in sheet balsa between formers No 1 No 2 upon tank will rest Put tank position run silicone tubing extend about 4 beyond former No 1 holes tubing must above side engine mount sure tank location check see can removed through cutout former No 2 everything OK pad tank foam plank cowl front cockpit used -in-wide strips -in sheet balsa planking Start 104 ModelAviation Full-Size Plans Available. See Page 186 DIHEDRAL BRACE MAKE Tif AS/BIIII S LOCATOANSIIII II~IIR BALSA RON WiNGTUSTACIY 4 4 SQ HARD BALSA I/H PLY RIB 3/32BALSA VRPLY RIB YE 3/8 HI BSLSA ~ ILI/ASS BALSA3/ORALS7 3 CAAHHEL WINS 5 DIHEDRAL BALSA I/B PLY WINDSCREEN -P3 BU OS SE RON S / / / 3/IHH 1/2 I/IHBALSA ---Th zzz BALSA K I/R MUSIC WIRE 3/32 ALSA IA 3/32 BALSA 2 3/10 RALS I/B A/C PLY S/16H 3/B BALSA 3/ IS 55 RUDDER CRASS RH AC E MADE N AlOOF LINE 3/32 HUSIC WIRE 3/IH 55 7 5I T 0 S 2 3 L 50005 WINO STOUT 3/BS I/A SPRUCE I/ASO SPLITS HEISFUHEE WITH ULURINUM CRICKET DES ANEO THAWS NOES HY PAUL F DESSAS II 0IU3A S S spruce longerons work top center side center strip fitted last makes feel better cowl can rough-sanded now hold off final sand ing until cowl etc position everything faked together Its time build separate firewall mounting engine building cowl around Attach engine mount firewall 4-40 machine screws blind mounting nuts As soon blind nuts set back firewall reverse screws stick out back side about 32 locate firewall against former No 1 Make sure register squeeze together machine screws will leave indentations face former No 1 Enlarge indentations about eter Vi6 deep Dremel cutter does fine job indentations will receive blind nuts two surfaces will fit together flat Put two surfaces back register check see firewall V32 smaller around former No 1 two surfaces together drill holes firewall fuel tubing Also drill four holes blind nuts screws will hold two surfaces contact Put blind nuts rear side No 1 former through bottom Add bottom skin former No 1 aft station No 3 Build cowl ring -in aircraft plywood fasten choice engine engine mount Screw down mount tight firewall Cut two pieces -in Lite Ply about 3 long Place firewall workbench erect strips top curve flat bottom such manner will support cowl ring prop drive washer should stick out through hole cowl ring about everything level square epoxy cowl ring supports place epoxy has hardened erect two support strips side making sure equally spaced side cowl parting line Once two set up attached bottom edge May1987 105 times have patience beveled cowl ring firewall sanding block cowl covering 2 aircraft plywood would glue flush both Cut piece heavy paper pattern plans top cowl skin Drape over top cowl see fits small amount sticking out fore aft sides paper should exactly split side cowl ring support braces Using paper pattern cut piece z aircraft ply match soaked ply hot water few minutes formed around top cowl everything fits well glue place used clamps protector strips fasten edges cowl skin cowl ring supports contact must absolutely flat will match bottom pieces cowl skin Three pieces sets must made cabane struts wing struts under fuselage strut anchor strut anchor a -in strip aluminum long enough stick out fuselage Drill holes ends strip couple holes under fuselage through anchor screws pass hold itm place cabane struts little dif ficult Cut four pieces -in brass tubing 1 long Also cut four pieces %4 brass tubing shorter pieces doublers strengthen outer ends longer pieces Slide flush place tubing vise squeeze flat Bend two pieces 5/ piano wire shapes given plans legs front cabane longest Place squeezed-flat end brass tubing back vise Insert leg piano wire open end tubing bend until lambda upside down V vertical Remove fitting vise insert another Put other leg cowl ring should removed ease engine installation removal Take off engines prop washer needle valve building model engine going out great number times make easy yourself As engine becomes more closed discovered has removed engine mount reinstalled engine cowl compiete unit made separately fuselage attached firewall fourAilen-head machine screws blind mounting nuts cowl exterior 1/32 aircraft plywood assembled three pieces Doublers back up ply parting lines cutout side should made match particular choice engine radio compartment size adequate flight gear battery placed beneath receiver slot tank compartment floor throttle pushrod passes through way engine filler between stringers rear deck shaped sandpaper wrapped around wooden dowels various diameters Note extension bottom vertical fin does show plans leading edge stabilizer rounded elevators tapersanded LE TE front deck pieces cut 1/s x1/s-in balsa piece beveled Build bottom up side adding center piece last Sand round shape open end bend until lambda vertical same rear cabane wire cleaned fine sand paper soldered pieces brass tubing Drill two holes flattened end large enough pass 2-56 machine screw Erect two cabane struts above cockpit careful 2-56 screws will pass through spruce add washer nut pull up tight wing struts made Y16-inthick spruce strips e bottom end saw slot fine saw Insert piece sheet aluminum slot File off surplus around edges epoxy place outer ends drilled small L-shaped cup hooks local hardware store cut short pieces inner Gold-N-Rod squeezed outer end L hook bring diameter up drilled lower end wing struts match hole underfuselage anchor 2-56 machine screw lock washer nut holds position upper ends inserted landing gear clamps screwed anchor blocks outer portion wing good idea fully assemble skeleton plane point will make things easier covering screw holes will already place Note location two landing gear clamps called out plans located underside wing Drill holes bottom doubled -in wing rib two clamps Insert screw holes tighten clamp almost bottom wing rib same other Turn wing upside down turn fuselage sideways across wing clamps looped over sides cabane struts Insert second screws pull clamps uptight Since clamps wire Y64 wire will slide through clamp turn corner wing sitting atop cabanes Turn everything over sit plane its landing gear Add wing struts Fasten fuselage anchor tuck L-hooks landing gear clamps added anchors built outer portion wing Wing alignment two front struts will determine dihedral two back struts will determine washout Sit plane workbench wheels tail propped up fuselage level able get L hooks landing gear clamps un doubtedly will difference distance workbench up wing tip side Measuring workbench up front corner wing tips adjust turning out L-hooks distance same wingtip measured distance leading edge trailing edge root rib difference measurement taken wing tip trailing edge corner much lower leading edge corner will assure no warp wing Leave wing flat until covered time will put washout rear wing spar will lengthened take washout consideration Pin tail surfaces place fit pushrods servos way elevator rudder horns will easier locate tail assembly covered Covering built three channels out ailerons washout wing neces sary center section wing should stall washout tips will still lifting wing stalls wash out whole wing stalls very dangerous maneuver called tip stall will occur disastrous happens plane close ground landing example Washout put after wing has covered film choice first putting -in block under outboard trailing edge corner holding center wing flat work bench will cause diagonal wrinldes form plastic material Iron out wrinkles shrink covering wing Hold wing position until covering cools bottom covering should ironed flat trying warp top covering will hold washout position Final washout plane should approximately pecial covering advice tail surfaces standard fuselage longer width plastic covering films Cover pieces First cover turtledeck top fuselage Cover cowl what cut off piece Cover bottom two pieces Start end ply skin overlap Y16 cover tail Come back another piece cover Continued page 185 Only covering remains prototypes case white MonoKote dark blue Trim MonoKote Engine cowi painted white match Windshield fabricating tip Cut 3/8-in white strip thetop oleo butter container RC 56 Wilhoid glue affix strip over bottom windshield dry trim shape strip will hold windshield ins gentle curve author used three small pins attach com bination forward deck applied drop cyanoacrylate pin location Model B Fike 1936 Long-Harlequin engine provided inspiration Cricket model its easyto seethe similarities Picturewastaken old EAA Museum -ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS 4-M Company10 AMA MembershiploS Academy Aviation R&D180 Ace Radio Control8 39 Aerodrome Models Ltd178 Aerospace Composite Products49 Airtronics2 AI-Tec & Su-Pr-Line Prod154 Altech MarketingCover 3 American Jr Aircraft Co146 Applied Design Corp18 Astro Flight4 Authorized Radio Control Service36 Avio99 Quay Barber Models64 Blue Ridge Machinery & Tools159 Bolar Heli Resesarch178 Bradley Products16 Dave Brown Products47 Bru Line lncustries39 Byron Originals9495 Campbell Tools Co178 Carolina-Taffinder49 Johnnle Casburn Mfg12 Champion Models53 Cheveron177 Cleveland Model Supply20 Eric Clutton178 Coverite35 91 Cr, Hobbies49 Electronics10 51 146 53 I22 174 164-169 17 adlo51 C5 154 55 34 19 a177 51 23 171 13 Helicopters Unlimited11 HighSky178 Harry B Higley & Sons55 Historic Aviation37 Hobby Barn148-149 Hobby Horn16 Hobby Lobby International151 Hobbypoxy Products171 Hobby Woods4 Ikon Northwest Co180 Indy RO Sales Inc156-158 JC Development Co159 JTec184 Larry Jolly Model Products179 Jomar183 K&BMfg183 K&S Engineering36 K W Enterprises178 Kraft Midwest18 Kustom Kraftsmanship146 Kyosho88 Lake Enterprises172 Leisure Electronics147 EldonJLind 9o171 Lone Star Models16 MACS Products172 Matrix Enterprises Inc18 Matts Model Airplanes53 McDaniel RC Service uvia McDougal Design Co Bruce Meeson Publishing Messers Quality Model Produc Micro Mark Micro Model Engineering Micro-X- Products Model Expo Model Rectifier Corp Sid Morgan Plans Mutchlers Hobbies Navitlus Industries Northeast Aerodynamics 0S Engines PK Products Pacer Technology 0 172 Paper Airplanes Intl Pelican Enterprises Penn International ChemicalsZenith Penn Valley Hobby CenterNick Z Pica Products Polks Hobby Progress Mfg Co Pro-Tune Corp QSPRA Qantas RC Extras Radio South Rays Hobby Red Max Fuel Repla-Tech lnterntional Roamin Research Roush Manufacturing S&D Model Products SR Batteries STM Sachs hv TG bermiectors ShImports Sh Try Electric Youll like nothing like Electric Elation responding advertisers mention read about Model Aviation Cricket/Denson Continued page 107 bend around front former No 1 about Coat whole front former epoxy cowl Cricketwas painted white enamel gave two coats primer two coats gloss white Finally applied coat clear Dont forget back firewall needs fuel-proofing just much rest plane paint struts rear ends pushrods landing gear cabane struts hubs Trexler wheels painted inside cockpit two coats flat black paint Should decide include cockpit hatch will go long way toward dressing up plane hatch cover overlaps side flush top cut 1/32 aircraft plywood frame inside made -in-sq balsa will make flush inside fuselage found length 1/16 OD copper tubing hobby shop through ran piece music wire SAFE FLYING IS NO ACCIDENT May1987 185 55 A7 bottom forward sides done exactly same way Allow covering Now Sullivans BaldNiilevis fills missinq link past push rods clevis purchased separately Now Sullivan Products completes connection combining famous Gold-N-Rod togetherwith newest product Gold-N-Clevis package Designed especially Gold-N-Rod Sullivans Gold-N-Clevis fills missing link quality push rod connections What sets clevis apart its spring steel retaining clip wont allow Gold-N-Clevis open under heavy use welded center pin adds extra strength rolled threaded collar its interlocking seam cannot separate yet still allows accurate adjustment 2/56 threaded rods Sullivans clevis brass-plated allowing solder place Gold-N-Clevis proudly made USA now available sepa rately part Gold-N-Push Rod kit dealer near 7AFFt5WPi 7OEV1Z PRODUCTS North Haven Street O PO Box 5166 Baltimore MD 21224 732-3500 fly near onerhead elect nc power lines 188 Model Aviation

NO OCR TEXT NO OCR TEXT model design cowl old-timers small opposed-cylin der engines mounted high firewall cowling situation fairly easy engine Fike B Harle quin has two Harley Davidson motor cycle cylinders crankcase designed Les Long duplicate high location firewall model engine has mounted upside down 900 upright have seen problems inverted model engines avoid configu ration like plague choice mount engine horizontally standard mufflers will work Du-Bro Slimline similar will learned neat trick working Lou Proctor two firewalls better model built front former acting firewall whole cowl engine muffler ar ranged another firewall attaches first 4-40 machine screws decision blessing disguise first cowl discarded because Len lae Cockpit door allows easy access radio gear rear curve fuel tank exposed allowing observation wnuue Tilling Bezel Instrument panel cross sections cut various sizes brass tubing Right Silmilne muffler fits neatly alongside cowl throttle pushrod convenience passes under fuel tank has large Z-bend connecting throttle arm Left Trexier wneeis resemble wheels used old Model B Pike inspiration Cricket landing gear wire plans will fit both 3-and 31/2in Trexiers hubs different cut landing gearto size needed Right La screwed outer ends wing struts must doubled size small pieces inner pushrod material theywili fit securely under nylon landing gear clamps Before painting ends strut wrapped heavy thread sealed 5-mm epoxy 102 Model Aviation Airfoil old standby 15% Clark Y 8-in chord 48-in span means has aspect ratio 61 Atthe prototypes48-oz weight wing loading 1802/sq ft Engine installed lean 08 2Otwo-stroke Bymovingthe cowl ring forward slightly 2Ofour-stroke engine would excellent choice power plant photographs author Left A standard nylon tall wheel bracket attached triangular 1/a-ln plywood platform fuselage bottom carries 1-in Ace tall wheel radio antenna allowed dangle plane flight Going through fuselage antenna wire Inside plas tic tube old roil-up window shade Right Latches cockpit door smell pieces plastic screwed place latch turned engine cowl shown first author discarded aesthetic reasons Drill wheel hubs 5/32 bit insert 5/32 brass tubing bearing surface Add 1/s-in wheel locks remove excess length gear wire Left Spaces between stringers aft deck filled 3/16 soft balsa beforerounding deck Formers scalloped between stringers prevent covering bulging Note crossed diagonals top bottom Right can see method used attaching struts both wing fuselage Heavy thread wrapped around ends strut prevent splitting just didnt like lines make new firewall move engine up new cowl Without two-firewall situation would have build whole new fuselage re mainder model standard con struction except doubled -in ply center wing rib Wing Since like build fuselages usually start wing save best until last First decide whether will want ailerons will have threechannel ship cut out kit parts Cut out wing ribs Get some Sig pre-shaped 3/4 x %-in leading edge LE stock local hobby shop no pre-shaped tralling edge TE stock use two Ys x 1-in pieces light balsa have power saw TE pieces can ripped out just minutes otherwise plane sandpaper will fine job spars relatively hard -in-sq balsa Chances have enough -in ply scrap box center rib doublers side strong center rib will anchor point attaching wing fuselage will need enough 1/16 aircraft plywood make two di hedral braces finished shaping TE stock cut indentations rib ends taped three thicknesses hacksaw blades together saw notches conjunction depth gauge Notches made way will take 3/ rib very snugly small drop cyanoacrylate glue CyA will anchor firmly rib positions wing ailerons same use ailerons outboard ribs have modified accordingly either case bottom spar fastened workbench trailing edges ribs will fit snugly TE notches CyA ribs spar place Glue top spar CyA glue center rib time Pin LE tight against rib fronts add drop CyA joint wing finished following three-channel wing ailerons building aileron wing read over proceed finished wing own manner Cut strut anchors -in Lite Ply glue forward ones place epoxy aft short spars will have notched bottom outboard wing ribs indicated plans anchor epoxied between two ribs tight against short spar pictures note strut anchor blocks May 1q87 103 view shows ends cabana struts fabricated Former P-3 must set back allow rear cabne clear cockpit door hinge isa piece brass copper tubing epoxied bottom edge music wire passing through tubing side short spar accident front block epoxied wrong side too late remove discovery made stays Dont careless Use sanding block bevel ends spars LE TE two halves will fit together exactly tip blocked up 2 block up 1 wing ailerons Zona Saw remove first /16 injust behind spar first rib outboard center Slip di hedral brace space epoxy-glue using clamps hold tight against spar cured remove 1/16 vertically same two ribs just forward spars epoxy-glue another dihedral brace slot Add V16 webbing forward side spars out wing tips Double center rib -in ply shown plans Cut length epoxy center wing tip ribs made /6 balsa Put diagonal braces corners Sand everything c&efully wing now ready covering tail assembly construction com pletely standard Everything built 46 stock widths per plans joiner between two elevator halves made %4 piano wire epoxied grooves cut forward edge elevator Fuselage Cut formers ply per plans No 1 former -in aircraft ply second former landing gear attached /16 aircraft ply firewalls Bend landing gear -in piano wire affix former No 2 four nylon landing gear clamps Cover plans wax paper construct left side fuselage longerons 6-sq spruce frame cockpit door Station Nol 3just aft cockpit also spruce other vertical diagonal members 3/16-sq balsa glue has completely set up remove pins apply V32 ply skin firewall aft former just behind cockpit Duplicate right side except cockpit door please make sure have left right fuselage Drill holes A2 ply skin landing gear Slide side over landing gear wires until flush against former No 2 Add glue erect upside down over top view plans Pin place making sure everything vertical Quickly add former No 1 glue tape place Allow glue dry thoroughly Add two cross braces station No 3 bottom line vertical components top is own width rear station No 3 will allow cabane strut tQ fasten directly side fuselage station No 3 braced rear first turtledeck former Bend two sides together tail end H WING STRUT ANCHORAVSRSRJSIC WIREINNER GOLD N PLO K bORING INBOARD H w AILERON WING S DIHEDRAL FTUROTTLERUDDER IRPL UTOP LHOTTOM I-/ ALUMINUM WING STRUT YR RALGA PLANKINGANEDOR REND ENDS AD DOABLE ROTO SIDES FIREWALLWITU IR &C PLOEAR LEG GUSHED 3IRAC PLOFRONT LEG Fl SOLID lINAC PLO ______ ______ 3132WIRECIG IIRAdC PLO USD0 ENGINE lU HOAFT ROAST FJ COWL RING LOR*C PLO 441RjIj II OR DARRO TANK Fl- TING LINE--'K LAGESIED 113ZPLO 1132 PLO RDTTERTENDS HERE REORRIGUT SIDE AIRTUONICS TREOLEU 3-lIZ WHEELS Taper wood glue together Install top bottom cross braces diagonals Cut turtledeck form ers -in medium balsa Transfer location marks longerons edges balsa formers Glue formers place glue thoroughly dry check location marks straight edge former does touch straightedge little sanding will have done notch lines straight line cut notches Slip longerons place checking straightness eye glue place rear end turtledeck some longerons will have notched bottom side will fair place fillers between longer ons turtledeck individually cut fitted pieces -in soft balsa Build platform -in sheet balsa between formers No 1 No 2 upon tank will rest Put tank position run silicone tubing extend about 4 beyond former No 1 holes tubing must above side engine mount sure tank location check see can removed through cutout former No 2 everything OK pad tank foam plank cowl front cockpit used -in-wide strips -in sheet balsa planking Start 104 ModelAviation Full-Size Plans Available. See Page 186 DIHEDRAL BRACE MAKE Tif AS/BIIII S LOCATOANSIIII II~IIR BALSA RON WiNGTUSTACIY 4 4 SQ HARD BALSA I/H PLY RIB 3/32BALSA VRPLY RIB YE 3/8 HI BSLSA ~ ILI/ASS BALSA3/ORALS7 3 CAAHHEL WINS 5 DIHEDRAL BALSA I/B PLY WINDSCREEN -P3 BU OS SE RON S / / / 3/IHH 1/2 I/IHBALSA ---Th zzz BALSA K I/R MUSIC WIRE 3/32 ALSA IA 3/32 BALSA 2 3/10 RALS I/B A/C PLY S/16H 3/B BALSA 3/ IS 55 RUDDER CRASS RH AC E MADE N AlOOF LINE 3/32 HUSIC WIRE 3/IH 55 7 5I T 0 S 2 3 L 50005 WINO STOUT 3/BS I/A SPRUCE I/ASO SPLITS HEISFUHEE WITH ULURINUM CRICKET DES ANEO THAWS NOES HY PAUL F DESSAS II 0IU3A S S spruce longerons work top center side center strip fitted last makes feel better cowl can rough-sanded now hold off final sand ing until cowl etc position everything faked together Its time build separate firewall mounting engine building cowl around Attach engine mount firewall 4-40 machine screws blind mounting nuts As soon blind nuts set back firewall reverse screws stick out back side about 32 locate firewall against former No 1 Make sure register squeeze together machine screws will leave indentations face former No 1 Enlarge indentations about eter Vi6 deep Dremel cutter does fine job indentations will receive blind nuts two surfaces will fit together flat Put two surfaces back register check see firewall V32 smaller around former No 1 two surfaces together drill holes firewall fuel tubing Also drill four holes blind nuts screws will hold two surfaces contact Put blind nuts rear side No 1 former through bottom Add bottom skin former No 1 aft station No 3 Build cowl ring -in aircraft plywood fasten choice engine engine mount Screw down mount tight firewall Cut two pieces -in Lite Ply about 3 long Place firewall workbench erect strips top curve flat bottom such manner will support cowl ring prop drive washer should stick out through hole cowl ring about everything level square epoxy cowl ring supports place epoxy has hardened erect two support strips side making sure equally spaced side cowl parting line Once two set up attached bottom edge May1987 105 times have patience beveled cowl ring firewall sanding block cowl covering 2 aircraft plywood would glue flush both Cut piece heavy paper pattern plans top cowl skin Drape over top cowl see fits small amount sticking out fore aft sides paper should exactly split side cowl ring support braces Using paper pattern cut piece z aircraft ply match soaked ply hot water few minutes formed around top cowl everything fits well glue place used clamps protector strips fasten edges cowl skin cowl ring supports contact must absolutely flat will match bottom pieces cowl skin Three pieces sets must made cabane struts wing struts under fuselage strut anchor strut anchor a -in strip aluminum long enough stick out fuselage Drill holes ends strip couple holes under fuselage through anchor screws pass hold itm place cabane struts little dif ficult Cut four pieces -in brass tubing 1 long Also cut four pieces %4 brass tubing shorter pieces doublers strengthen outer ends longer pieces Slide flush place tubing vise squeeze flat Bend two pieces 5/ piano wire shapes given plans legs front cabane longest Place squeezed-flat end brass tubing back vise Insert leg piano wire open end tubing bend until lambda upside down V vertical Remove fitting vise insert another Put other leg cowl ring should removed ease engine installation removal Take off engines prop washer needle valve building model engine going out great number times make easy yourself As engine becomes more closed discovered has removed engine mount reinstalled engine cowl compiete unit made separately fuselage attached firewall fourAilen-head machine screws blind mounting nuts cowl exterior 1/32 aircraft plywood assembled three pieces Doublers back up ply parting lines cutout side should made match particular choice engine radio compartment size adequate flight gear battery placed beneath receiver slot tank compartment floor throttle pushrod passes through way engine filler between stringers rear deck shaped sandpaper wrapped around wooden dowels various diameters Note extension bottom vertical fin does show plans leading edge stabilizer rounded elevators tapersanded LE TE front deck pieces cut 1/s x1/s-in balsa piece beveled Build bottom up side adding center piece last Sand round shape open end bend until lambda vertical same rear cabane wire cleaned fine sand paper soldered pieces brass tubing Drill two holes flattened end large enough pass 2-56 machine screw Erect two cabane struts above cockpit careful 2-56 screws will pass through spruce add washer nut pull up tight wing struts made Y16-inthick spruce strips e bottom end saw slot fine saw Insert piece sheet aluminum slot File off surplus around edges epoxy place outer ends drilled small L-shaped cup hooks local hardware store cut short pieces inner Gold-N-Rod squeezed outer end L hook bring diameter up drilled lower end wing struts match hole underfuselage anchor 2-56 machine screw lock washer nut holds position upper ends inserted landing gear clamps screwed anchor blocks outer portion wing good idea fully assemble skeleton plane point will make things easier covering screw holes will already place Note location two landing gear clamps called out plans located underside wing Drill holes bottom doubled -in wing rib two clamps Insert screw holes tighten clamp almost bottom wing rib same other Turn wing upside down turn fuselage sideways across wing clamps looped over sides cabane struts Insert second screws pull clamps uptight Since clamps wire Y64 wire will slide through clamp turn corner wing sitting atop cabanes Turn everything over sit plane its landing gear Add wing struts Fasten fuselage anchor tuck L-hooks landing gear clamps added anchors built outer portion wing Wing alignment two front struts will determine dihedral two back struts will determine washout Sit plane workbench wheels tail propped up fuselage level able get L hooks landing gear clamps un doubtedly will difference distance workbench up wing tip side Measuring workbench up front corner wing tips adjust turning out L-hooks distance same wingtip measured distance leading edge trailing edge root rib difference measurement taken wing tip trailing edge corner much lower leading edge corner will assure no warp wing Leave wing flat until covered time will put washout rear wing spar will lengthened take washout consideration Pin tail surfaces place fit pushrods servos way elevator rudder horns will easier locate tail assembly covered Covering built three channels out ailerons washout wing neces sary center section wing should stall washout tips will still lifting wing stalls wash out whole wing stalls very dangerous maneuver called tip stall will occur disastrous happens plane close ground landing example Washout put after wing has covered film choice first putting -in block under outboard trailing edge corner holding center wing flat work bench will cause diagonal wrinldes form plastic material Iron out wrinkles shrink covering wing Hold wing position until covering cools bottom covering should ironed flat trying warp top covering will hold washout position Final washout plane should approximately pecial covering advice tail surfaces standard fuselage longer width plastic covering films Cover pieces First cover turtledeck top fuselage Cover cowl what cut off piece Cover bottom two pieces Start end ply skin overlap Y16 cover tail Come back another piece cover Continued page 185 Only covering remains prototypes case white MonoKote dark blue Trim MonoKote Engine cowi painted white match Windshield fabricating tip Cut 3/8-in white strip thetop oleo butter container RC 56 Wilhoid glue affix strip over bottom windshield dry trim shape strip will hold windshield ins gentle curve author used three small pins attach com bination forward deck applied drop cyanoacrylate pin location Model B Fike 1936 Long-Harlequin engine provided inspiration Cricket model its easyto seethe similarities Picturewastaken old EAA Museum -ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS 4-M Company10 AMA MembershiploS Academy Aviation R&D180 Ace Radio Control8 39 Aerodrome Models Ltd178 Aerospace Composite Products49 Airtronics2 AI-Tec & Su-Pr-Line Prod154 Altech MarketingCover 3 American Jr Aircraft Co146 Applied Design Corp18 Astro Flight4 Authorized Radio Control Service36 Avio99 Quay Barber Models64 Blue Ridge Machinery & Tools159 Bolar Heli Resesarch178 Bradley Products16 Dave Brown Products47 Bru Line lncustries39 Byron Originals9495 Campbell Tools Co178 Carolina-Taffinder49 Johnnle Casburn Mfg12 Champion Models53 Cheveron177 Cleveland Model Supply20 Eric Clutton178 Coverite35 91 Cr, Hobbies49 Electronics10 51 146 53 I22 174 164-169 17 adlo51 C5 154 55 34 19 a177 51 23 171 13 Helicopters Unlimited11 HighSky178 Harry B Higley & Sons55 Historic Aviation37 Hobby Barn148-149 Hobby Horn16 Hobby Lobby International151 Hobbypoxy Products171 Hobby Woods4 Ikon Northwest Co180 Indy RO Sales Inc156-158 JC Development Co159 JTec184 Larry Jolly Model Products179 Jomar183 K&BMfg183 K&S Engineering36 K W Enterprises178 Kraft Midwest18 Kustom Kraftsmanship146 Kyosho88 Lake Enterprises172 Leisure Electronics147 EldonJLind 9o171 Lone Star Models16 MACS Products172 Matrix Enterprises Inc18 Matts Model Airplanes53 McDaniel RC Service uvia McDougal Design Co Bruce Meeson Publishing Messers Quality Model Produc Micro Mark Micro Model Engineering Micro-X- Products Model Expo Model Rectifier Corp Sid Morgan Plans Mutchlers Hobbies Navitlus Industries Northeast Aerodynamics 0S Engines PK Products Pacer Technology 0 172 Paper Airplanes Intl Pelican Enterprises Penn International ChemicalsZenith Penn Valley Hobby CenterNick Z Pica Products Polks Hobby Progress Mfg Co Pro-Tune Corp QSPRA Qantas RC Extras Radio South Rays Hobby Red Max Fuel Repla-Tech lnterntional Roamin Research Roush Manufacturing S&D Model Products SR Batteries STM Sachs hv TG bermiectors ShImports Sh Try Electric Youll like nothing like Electric Elation responding advertisers mention read about Model Aviation Cricket/Denson Continued page 107 bend around front former No 1 about Coat whole front former epoxy cowl Cricketwas painted white enamel gave two coats primer two coats gloss white Finally applied coat clear Dont forget back firewall needs fuel-proofing just much rest plane paint struts rear ends pushrods landing gear cabane struts hubs Trexler wheels painted inside cockpit two coats flat black paint Should decide include cockpit hatch will go long way toward dressing up plane hatch cover overlaps side flush top cut 1/32 aircraft plywood frame inside made -in-sq balsa will make flush inside fuselage found length 1/16 OD copper tubing hobby shop through ran piece music wire SAFE FLYING IS NO ACCIDENT May1987 185 55 A7 bottom forward sides done exactly same way Allow covering Now Sullivans BaldNiilevis fills missinq link past push rods clevis purchased separately Now Sullivan Products completes connection combining famous Gold-N-Rod togetherwith newest product Gold-N-Clevis package Designed especially Gold-N-Rod Sullivans Gold-N-Clevis fills missing link quality push rod connections What sets clevis apart its spring steel retaining clip wont allow Gold-N-Clevis open under heavy use welded center pin adds extra strength rolled threaded collar its interlocking seam cannot separate yet still allows accurate adjustment 2/56 threaded rods Sullivans clevis brass-plated allowing solder place Gold-N-Clevis proudly made USA now available sepa rately part Gold-N-Push Rod kit dealer near 7AFFt5WPi 7OEV1Z PRODUCTS North Haven Street O PO Box 5166 Baltimore MD 21224 732-3500 fly near onerhead elect nc power lines 188 Model Aviation