Designed expressly Fox MK Ill Combat Special Fast Slow Combat Fox 15 orsimilarengine FAI state-ofthe-art design durable cheap easy build repair stable enough fly eyes-off yet tight turning enough competition 0 Chuck Rudner THE introduction Fox MK III Combat Special has done lot help popularity control-line combat since capable 120mph speeds box-stock configuration Due greater weight engine relative previously dominant Supertigre 35s currently available kits two pre viously published built-up balsa designs Buck staff Wilkens both MA obsolete due insufficient wing area allow adequate turn ing capabilities Several years ago tired building more complex planes sheeted leading edges cap strips etc time started develop simple durable cheap combat plane ade quate wing area new Fox MK III allow competitive turning ability drew simpler construction methods Wooten Voodoo utilizing pre-formed Pactra leading edges split-vee 1/16 sheet trailing edges Rather using spars plane makes use pro32 Model Aviation ne avu u-am versions raciyier version requires rearward position 0 leadouts Inboard tip due lack outboard wing weight effect fuel loadwith bladder systems effect present FUILSIZEPLANSAVAILABLE AGE 128 QFAA SE PA EOBeAT SAFE L37ZOKZI BA RH PUPC ENASPC PANE PA ERN PEE FORUFA PACPA CE COAC ERALSA ROSA AURA ERS ON SOASUARSUSES AZ NA JAPSE RU Jo ESTES ER SR HOCEE ILCRSALSA SSPET HIS PATREBA UIR BALSAETCH NAB HPFBSE6S SBBEH COMBAT ICASF FEE EIEU CS CLOTS TURF RON GEUR DESIGNED BY CHUCK RUDNER CROWS RE JOE OFMURCO jTRAIOSS FUSE ERFORCELEE IESALSAAUINE SOrB BALSA CRA FONFLUAF SA AFAAARB BALSA SRAO ORBALSA H REAP iOi~POSIRIOR OF CA UOAFLS AREOE CAg]SEA CO BALSA AS SLOW COMBAT VERSION CASULSA OSASTFO FOR CLAURT F STIFFENERfIR ALA PS S - gressive rib spacing heavy plastic film cover mg FasCal After perfecting design fast combat plane tried sanie wing Slow FAI Combat have quite pleased results FAI version main design used win place 1978 US FAL Combat team three versions have placed local Combat events flexibility strong center section Rongeur combine give durability better seemingly substantial designs leading edge stiffener struc turally tapered trailing edge insure structural break crash will occur inboard outboard center section Thus damaged wing easily replaced stripping remaining lead ing edge center section stiffener midline adding new wing half much easier building whole new plane done properly does add mea surably planes weight fast FAI versions can built either bladder pacifier type pressurized fuel systems Slow Combat version conforms current five-inch nose rule have found Pactra leading edges bluntest shape available pre-formed leading edge consistently straight come variety weights use medium-hard Fast Slow versions medium weight FAI version leading edge too light wing will fold during hard maneuvering Construction Begin cutting iX maple motor mounts shape Also cut -in balsa vertical grain center block cut bellcrank slot yet Use Hobbypoxy Formula II other slow-drying epoxy strength Force epoxy grain center block before gluing C-clamping maple mounts center block Place whole assembly outboard face down flat surface covered plastic food wrap insure true surface engine mounting flanges assembly drying mark out rib spacing leading edge felt-tip marker use ball-point pen pencil balsa can cause desits weaken part Cut leading edge stiffener 3/32 ply Taper ends electric drill sander minimize stress concentration area leading edge Glue leading edge stiffener flat rear surface leading edge lining up center section rib marks drew leading edge Note stiffener -in narrower December 1979 33 MORE SEW VHS PUS UP NPIFFFNFH 7 utnur S oummuing jig wiin S~dF1 iuLr-~n Br tube cutting jig rib blocks removBd covered model fits back jig allOwirrv dBwarpingmild warps often accrue after ironing films such FasCal Note centerSiun parts leading edge stripper foregroundalso plywood template immediate foreground Jig easy repairs rear surface leading edge leave equal 1/16-in space top bottom edge allows center planking fit down flush leading edge Take time evenly aligning stiffener onto leading edge cause center tabs stiffener will later fit between mounts insure zero angle incidence use epoxy also waiting epoxy dry cut trailing edge pieces medium-hard 1/16 sheet Full length 36-in balsa used center section offset slightly toward outboard wing provide longer inboard outboard panel Thus top bottom trailing edges interchangeable once inner bevel created rear trailing edge pre-bevel trailing edges begin plac ing long stralght piece glass steel 36-in steel rule along edge workbench Lay rear edge trailing edge guide Use masking tape cover rearward-most 7/16-in tape should secure balsa glass steel guide rear edges being flush use electric drill sander run length trailing edge sanding between tape glass steel edge have used technique since 1960s find takes minute Pre-beveling increases strength structure gives sharp trailing edge theoretically aerodynamic advantage Mark rib spacing lower trailing edge fine tip-felt pen Cut out main ribs 1/16 sheet balsa Use scrap created cuffing out trailing edges two tip ribs begin root ribs until medium-hard scrap runs out Cut remaining ribs lighter weight 1/16 balsa main ribs basically same shape however trailing edge notches get progres sively wider toward root ribs can cut stack using band saw separately make differential trailing edge notches find easier use 1/16 plywood pattern indi vidually numbered notches hand cut ribs * 11 blade ribs simple shape no spar hole can done fast stacking balsa cut once plywood pattern has leadout hole positions drilled numbered inboard ribs #1 through #7 bladder tube hole cut outboard ribs #6 #7 use regular paper punch cut leadout holes after marking hole positions pattern Now cut four center ribs #8 #9 wing tips t balsa Cut slot mount assembly bellcrank mount Glue inboard center rib #9 engine mount Continued page 120 34 Model Aviation Fuel systems Left top B Heavy-duty pacifier reverse-fill surgical tube bladder standard surgical tube bladder double pen-bladder Right top B Inboard collapsing bag tank made Playtex nurser chicken-hopper tank Uniflow modification Randys 3Yz-oz tank top pressure measuring leak-down pressure various bladders thought combat simple Jig tor building aii versions toregrouno prior assemoiysiioing leading-edge holders rubberband tensioners hold airframe tight against TE jig backstops Removable rib blocks shown place inboard wing removed outboard Trailing edge pattern leadout jig jig fect alignmenthelps prevent unwanted up- dow,-thrust motor mount FAI versions shown THE THIRD ANNUAL iii JANUARY 12 & 13 1980 SEE THE LATEST PRODUCTS AND VISIT WITH MAJOR MANUFACTURERS AND DISTRIBUTORS OF MODEL AIRCRAFT* MODEL ENGINES MODEL BOATS\PeRADIOCONTROLSYSTEMS MODELCARSeMODELINGACCESSORIES INDOOR DEMONSTRATIONS STATIC DISPLAY COMPETITION IN MANY CATEGORIES Rongeu r/Rud ner continued page 34 assembly its inboard side very important position rib parallel axis motor mount insure will no up- downthrust motor mount use small balsa jig fixture aligning parts 5-minute epoxy gluing After assembly dry horizontal grain t center rib filler interlocking plywood bellcrank mount glued mount assembly epoxy point wing built omitting out board ribs #s 5 6 7 8 bladder tube versions outboard rib #8 pacifier ver sions use Hot Stuff microballoons fix two tip ribs outboard rib #9 inboard rib #7 leading trailing edges Ambroid will suffice cementing remaining ribs place Included template 1/16 sheet main ribs met-tru device Carl Goldberg Voodoo kits small tab can included inboard outboard ribs #1 #7 ribs should pre-perforated snap off junction between tab rib after construction allows wing built warp-free flat surface use specially constructed jig building planes eliminates need tabs Building jig allows ease both initial construction repairing also allows detection correction warps can created warp-free structure covering shrinking Fas-Cal essen tial parts jig shown plans next step mounting engine motor mounts location shown plans mm m mm inmm w m i~YtIL OW FEVER A1 I VEOTICE MFEVEfr has won *pqwhld I euca dwlng taut two yeses yyheU Iurns Ibm ALl OTHER RACERS co*hwdfltI o-s sport fiylau FEATUWESIjI Wsts se spin KIt hawinCgtU5 Thmui1 qucId 600 moksg *1W YVW mpor deiw b1W Eu. *1UIA Wins moti hA g Posi N*ininffibbd mets "I YiinuUe uIas~w r Paid o4fMlmu1 DEALER AUDOWTUUT IWVITUOPOstPaid PRODUCTS 681 WelierburnAw,msNrk MD 21146 mm align motor zero thrust remove glow plug use junk prop bolted onto crankshaft Attach heavy thread tip prop string attach clamp-type paper clip can slide along Adjust up- down-thrust engine attempting equalize distance upper lower maximums prop arc tothe trailing edge tip center rib adjusting thrust line up down checking distance string Rotate prop 1800 time checking distance along string paper clip zero up down thrust achieved bolt englne 4/40 machine screws blind mounts Remove englne center section hook up 2-in belicrank leadouts 1/16 music wire pushrod bellcrank mount use 125-pound-test Perfect braided leadout bushed bellcrank brass tubing same control system can reused numerous times pushrod goes outer hole bellcrank arm holes 4 hardwood dowels drilled mount 5/32 drill cemented place epoxy Using Hobbypoxy II glue center section unit against outboard rib #9 tabs leading edge stiffener assure zero angle inci dence upper trailing edge half now glued place use Ambroid joint between center section trailing edge glued 5-minute epoxy point bladder tube pacifier pod inserted using bladder tube cut length Estes BT 55 rocket body tube fit between outboard ribs #9 #5 Use paper punch punch upper lower vent holes large bladder exit hole Cap vertical grain 4 balsa caps Cement bladder tube place ribs #5 #6 and#7thenaddthepartsofoutboard 120 Model Aviation OVERSEAS EXHIBITORS CORDIALLY INVIIED INTERNATIONAL MODELER SHOW eox 127 COSTA MESA CA 92627 17141 548-4700 rib #8 Use 1/16-in scrap filler vent holes provide anchorage Fas-Cal pacifier pod used fashion 1/64 plywood wall a end caps small vent hole bottom outboard corner shown Glue outboard rib #9 glue outboard rib #8 sandwiching place Sheet center section 1 / 16 sheet Make sure glue sheeting center rib unit epoxy have followed instructions whole center rib unit sheeting over glued together epoxy technique have arrived after years crashes rough flying feel fairly massive center section helps damp engine vibration also prevents loosening monoboom-wing junction repeated hard maneuvering crashes wing tips now glued place leadout guides glued sewn inboard tip Construction tall section beglns hinge have shown hinge piece plans four separate plywood parts sandwiching 3/32 o d brass tube can built way desired actually make up 12-in strips brass tubing sandwiched between plywood cut hinge out strip aug saw Epoxy used fabricate hinge After hinge made wire axle brass tubing spacers added bent shape cemented pre-airfoiled stabilator cloth tape epoxied over tubing spacers stabilator leading edge pre-airfoil stabilator drawing ball-point pen midline around perimeter free-hand sanding shape electric drill sander takes about two minutes beats hand sanding stab shape sanding block medium-hard 1-in sq balsamonoboomis cut shape aug saw hinge cemented aligning trailing edge stab perpendicular monoboom drafting triangle Add large nylon control horn finish tall assembly epoxy palnt Rein force monoboom circumferencial loop fiberglass tape just aft wing slot rear binge glued Cover wing carefully Fas-Cal trying lay Fas-Cal surfaces same amount tension initially helps prevent warps due uneven tension F as-Cal after shrunk After wing covered shrunk replace jig remove warp has occurred during covering process holding pressure against warp re-ironing Fas-Cal ajig used gross warps can detected eyeballing along trailing edge finish inside bladder tube filling clear dope pouring out though dope fuel-proof some other finishing products such epoxy paint epoxy palnt can turn small speck sawdust sharp flaw inner surface bladder tube will puncture bladder consistentiy motor mount nacelle filler blocks cemented epoxy mount sanded shape drill sander mask off center section doing prevent slip sander ruining plane use epoxy paint fiberglass cloth finish mount Now excise covering sheeting monoboom will glued perforate sheeting times pin through center rib Epoxy monoboom wing Hobbypoxy Formula IL allow plenty working time get tail aligned wing Sight down trailing edge both wing stab rear align roll axis Use ruler equalize distance between wing trailing edge stabilator trailing edge SoIa FHm EXCLUSIVE LOW-HEAT COVERING FOR FOAM & BALSA FLYING MODELS flexible ble fuel proof lightweight pacIiu Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 COMPLETE THIS FORM AND ATrACH MAILING 1 LABEL FROM RECENT ISSUE K____ LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscriptIon rates $1600 12 months Canada United States pousessionselsewhere $1800 NAME ADDRESS CITY/STATEZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW. WASHINGTON DC 20005 December 1979 121 TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA HAND SELECTED PRECISION SANDED SHEETS KS DOWELS S TRIANGLES KS PLANKS planform alignment Install large nylon control horn Kwik Link wire pushrod guide omit pushrod guide because aerodynamic force stab during outside maneuvers will cause pushrod bowing less effective control outside maneuvers Slow Combat version uses same wing has standard balsa fuselage standard type nose Two pushrod guides required along long fuselage plane should balance motor prop installed 185% chord 1 -in rear leading edge bladder tube placed exactly along line prevent change center gravity fuel runs out center gravity second hole top control horn good starting point Fast Combat version should weigh 8 9 oz engine FAT version 8 8 oz Select slightly lighter wood FAT version Power Fast Slow Rongeurs MK III Fox Combat Special 25% nitro head clearance set 019 Power FAT version favorite high perforniance 151 like Fox 15 Take test flight check warps thrust misalignment usually minimal care taken during construction Rongeur will provide durable cheap easy build easy repair combat plane stable enough fly eyes-off yet tight turning enough competition hundreds others too numerous mention Joes impressive model faithfully duplicates unique features kind aircraft scored 258 static points tops Senior class Past wins include five first places second including first Junior Preci sion Scale 75 77 Nats B-25 scratch-built ves wingspan 25 5/16 inches overall length 21 inches According Joe model weighs pound half two mufflerized Cox 049 Space Hoppers flies 45 feet line flies either engine controlled Stanzel Stunt Master Monoline control unit entire model made balsa solid wings tail rudders hollowed-out fuselage used Aero-Gloss finish entire plane blue-tone white blue nacelle areas Dale adds interesting story relating Joes B-25 5X4 3-bladed props necessary extend flying time miscalculated tank sizes would fly about eight laps 50X016 line 5X3 props So slowed engine down 4-in pitch cut flying line down 45 feet runs about 12 14 laps both engines configuration Inclosing Im thrilled able feature up-close look two young competitors outstanding models because believe characteristic CL Scale modelings greatest strengths continued partici pation Junior Senior age modelers CL Scale degree seen other mode Scale flying Nationals have attended Junior Senior age contestants accounted between 40 50 percent total entries Its refreshing contrast trends noticeable other AMA events Scale Model Research Photos name service recently started Dale Willoughby make quality color photo packs unique fullscale aircraft available scale modelers Dale travels lot whenever possible photographs outstanding home-builts restored antiques interesting airplanes types encoun ters airports fly-ins museums result ing photo packs offers contain numerous views same subject aircraft crucial angies photo list #2 have just received describes packs 57 different aircraft including Wittman Tailwind Flying Flea Lockheed Orion P-26 Peashooter PT-22 Grumman Duck P-38s P-S P-40E on packs vary $550 $1750 per set contain 9 33 top quality color photos prints full 3X5A size 3AX5 means get full prints everything standard 35-mm negatives no spinners chopped off missing wing tips ordinarily free copy latest list send stamped self-addressed long envelope Dale Willoughby Scale Model Research Photos PO Box 675 Orange CA 92666 Now flying season winding down hope youll have time send some photos drawings ideas comments use column need contribution keep space interesting informative Dont forget ModelAviation will pay $5 item printed Mike Gretz Box 162 Montezuma L4 50171 CL Navy Carrier/Perry continued oage 37 slides feeler gage stock has advantage being available thickness desired use stock 0025 0030 depending thickness saw used slide very easily shaped using Dremel tool tungsten-carbide bits cut-off wheels cut-off wheel used router attachment excellent way make initial cut reduce slide approximate width desired Final trimming width should done drawing edge slide along file careful keep sides slide paralleL final polishing 320 grit finer paper should allow slide move freely still provide good seal opening slide should least large exhaust ports cylinder Larger betterwithin limits imposed size exhaust stack amount throttle move ment available need keep exhaust slide out back prop taper opening necessary provide manageable 122 Model Aviation GET ORGANIZED CL Scale/Gretz Hee 5 set 4 sia4y tiles hotds 4 yeas ot youi tavoite 8 t magazines continued page 35 4 MAG FILES $495 Send $496 plan $100 postage handling DOM INDUSTRIES PO BOX 388-K DOVER NH 03820 GEE BEE Z DECALS ALL NUMBERS 2in 1 SCALE & LETTERING EXCEPT THOSE OF THE WINGS GRANGER$4 95 POST WILLIAMS t8t PAWNEESTOSET SAN MARCOS CA F0RNA92069
Edition: Model Aviation - 1979/12
Page Numbers: 32, 33, 34, 120, 121, 122
Designed expressly Fox MK Ill Combat Special Fast Slow Combat Fox 15 orsimilarengine FAI state-ofthe-art design durable cheap easy build repair stable enough fly eyes-off yet tight turning enough competition 0 Chuck Rudner THE introduction Fox MK III Combat Special has done lot help popularity control-line combat since capable 120mph speeds box-stock configuration Due greater weight engine relative previously dominant Supertigre 35s currently available kits two pre viously published built-up balsa designs Buck staff Wilkens both MA obsolete due insufficient wing area allow adequate turn ing capabilities Several years ago tired building more complex planes sheeted leading edges cap strips etc time started develop simple durable cheap combat plane ade quate wing area new Fox MK III allow competitive turning ability drew simpler construction methods Wooten Voodoo utilizing pre-formed Pactra leading edges split-vee 1/16 sheet trailing edges Rather using spars plane makes use pro32 Model Aviation ne avu u-am versions raciyier version requires rearward position 0 leadouts Inboard tip due lack outboard wing weight effect fuel loadwith bladder systems effect present FUILSIZEPLANSAVAILABLE AGE 128 QFAA SE PA EOBeAT SAFE L37ZOKZI BA RH PUPC ENASPC PANE PA ERN PEE FORUFA PACPA CE COAC ERALSA ROSA AURA ERS ON SOASUARSUSES AZ NA JAPSE RU Jo ESTES ER SR HOCEE ILCRSALSA SSPET HIS PATREBA UIR BALSAETCH NAB HPFBSE6S SBBEH COMBAT ICASF FEE EIEU CS CLOTS TURF RON GEUR DESIGNED BY CHUCK RUDNER CROWS RE JOE OFMURCO jTRAIOSS FUSE ERFORCELEE IESALSAAUINE SOrB BALSA CRA FONFLUAF SA AFAAARB BALSA SRAO ORBALSA H REAP iOi~POSIRIOR OF CA UOAFLS AREOE CAg]SEA CO BALSA AS SLOW COMBAT VERSION CASULSA OSASTFO FOR CLAURT F STIFFENERfIR ALA PS S - gressive rib spacing heavy plastic film cover mg FasCal After perfecting design fast combat plane tried sanie wing Slow FAI Combat have quite pleased results FAI version main design used win place 1978 US FAL Combat team three versions have placed local Combat events flexibility strong center section Rongeur combine give durability better seemingly substantial designs leading edge stiffener struc turally tapered trailing edge insure structural break crash will occur inboard outboard center section Thus damaged wing easily replaced stripping remaining lead ing edge center section stiffener midline adding new wing half much easier building whole new plane done properly does add mea surably planes weight fast FAI versions can built either bladder pacifier type pressurized fuel systems Slow Combat version conforms current five-inch nose rule have found Pactra leading edges bluntest shape available pre-formed leading edge consistently straight come variety weights use medium-hard Fast Slow versions medium weight FAI version leading edge too light wing will fold during hard maneuvering Construction Begin cutting iX maple motor mounts shape Also cut -in balsa vertical grain center block cut bellcrank slot yet Use Hobbypoxy Formula II other slow-drying epoxy strength Force epoxy grain center block before gluing C-clamping maple mounts center block Place whole assembly outboard face down flat surface covered plastic food wrap insure true surface engine mounting flanges assembly drying mark out rib spacing leading edge felt-tip marker use ball-point pen pencil balsa can cause desits weaken part Cut leading edge stiffener 3/32 ply Taper ends electric drill sander minimize stress concentration area leading edge Glue leading edge stiffener flat rear surface leading edge lining up center section rib marks drew leading edge Note stiffener -in narrower December 1979 33 MORE SEW VHS PUS UP NPIFFFNFH 7 utnur S oummuing jig wiin S~dF1 iuLr-~n Br tube cutting jig rib blocks removBd covered model fits back jig allOwirrv dBwarpingmild warps often accrue after ironing films such FasCal Note centerSiun parts leading edge stripper foregroundalso plywood template immediate foreground Jig easy repairs rear surface leading edge leave equal 1/16-in space top bottom edge allows center planking fit down flush leading edge Take time evenly aligning stiffener onto leading edge cause center tabs stiffener will later fit between mounts insure zero angle incidence use epoxy also waiting epoxy dry cut trailing edge pieces medium-hard 1/16 sheet Full length 36-in balsa used center section offset slightly toward outboard wing provide longer inboard outboard panel Thus top bottom trailing edges interchangeable once inner bevel created rear trailing edge pre-bevel trailing edges begin plac ing long stralght piece glass steel 36-in steel rule along edge workbench Lay rear edge trailing edge guide Use masking tape cover rearward-most 7/16-in tape should secure balsa glass steel guide rear edges being flush use electric drill sander run length trailing edge sanding between tape glass steel edge have used technique since 1960s find takes minute Pre-beveling increases strength structure gives sharp trailing edge theoretically aerodynamic advantage Mark rib spacing lower trailing edge fine tip-felt pen Cut out main ribs 1/16 sheet balsa Use scrap created cuffing out trailing edges two tip ribs begin root ribs until medium-hard scrap runs out Cut remaining ribs lighter weight 1/16 balsa main ribs basically same shape however trailing edge notches get progres sively wider toward root ribs can cut stack using band saw separately make differential trailing edge notches find easier use 1/16 plywood pattern indi vidually numbered notches hand cut ribs * 11 blade ribs simple shape no spar hole can done fast stacking balsa cut once plywood pattern has leadout hole positions drilled numbered inboard ribs #1 through #7 bladder tube hole cut outboard ribs #6 #7 use regular paper punch cut leadout holes after marking hole positions pattern Now cut four center ribs #8 #9 wing tips t balsa Cut slot mount assembly bellcrank mount Glue inboard center rib #9 engine mount Continued page 120 34 Model Aviation Fuel systems Left top B Heavy-duty pacifier reverse-fill surgical tube bladder standard surgical tube bladder double pen-bladder Right top B Inboard collapsing bag tank made Playtex nurser chicken-hopper tank Uniflow modification Randys 3Yz-oz tank top pressure measuring leak-down pressure various bladders thought combat simple Jig tor building aii versions toregrouno prior assemoiysiioing leading-edge holders rubberband tensioners hold airframe tight against TE jig backstops Removable rib blocks shown place inboard wing removed outboard Trailing edge pattern leadout jig jig fect alignmenthelps prevent unwanted up- dow,-thrust motor mount FAI versions shown THE THIRD ANNUAL iii JANUARY 12 & 13 1980 SEE THE LATEST PRODUCTS AND VISIT WITH MAJOR MANUFACTURERS AND DISTRIBUTORS OF MODEL AIRCRAFT* MODEL ENGINES MODEL BOATS\PeRADIOCONTROLSYSTEMS MODELCARSeMODELINGACCESSORIES INDOOR DEMONSTRATIONS STATIC DISPLAY COMPETITION IN MANY CATEGORIES Rongeu r/Rud ner continued page 34 assembly its inboard side very important position rib parallel axis motor mount insure will no up- downthrust motor mount use small balsa jig fixture aligning parts 5-minute epoxy gluing After assembly dry horizontal grain t center rib filler interlocking plywood bellcrank mount glued mount assembly epoxy point wing built omitting out board ribs #s 5 6 7 8 bladder tube versions outboard rib #8 pacifier ver sions use Hot Stuff microballoons fix two tip ribs outboard rib #9 inboard rib #7 leading trailing edges Ambroid will suffice cementing remaining ribs place Included template 1/16 sheet main ribs met-tru device Carl Goldberg Voodoo kits small tab can included inboard outboard ribs #1 #7 ribs should pre-perforated snap off junction between tab rib after construction allows wing built warp-free flat surface use specially constructed jig building planes eliminates need tabs Building jig allows ease both initial construction repairing also allows detection correction warps can created warp-free structure covering shrinking Fas-Cal essen tial parts jig shown plans next step mounting engine motor mounts location shown plans mm m mm inmm w m i~YtIL OW FEVER A1 I VEOTICE MFEVEfr has won *pqwhld I euca dwlng taut two yeses yyheU Iurns Ibm ALl OTHER RACERS co*hwdfltI o-s sport fiylau FEATUWESIjI Wsts se spin KIt hawinCgtU5 Thmui1 qucId 600 moksg *1W YVW mpor deiw b1W Eu. *1UIA Wins moti hA g Posi N*ininffibbd mets "I YiinuUe uIas~w r Paid o4fMlmu1 DEALER AUDOWTUUT IWVITUOPOstPaid PRODUCTS 681 WelierburnAw,msNrk MD 21146 mm align motor zero thrust remove glow plug use junk prop bolted onto crankshaft Attach heavy thread tip prop string attach clamp-type paper clip can slide along Adjust up- down-thrust engine attempting equalize distance upper lower maximums prop arc tothe trailing edge tip center rib adjusting thrust line up down checking distance string Rotate prop 1800 time checking distance along string paper clip zero up down thrust achieved bolt englne 4/40 machine screws blind mounts Remove englne center section hook up 2-in belicrank leadouts 1/16 music wire pushrod bellcrank mount use 125-pound-test Perfect braided leadout bushed bellcrank brass tubing same control system can reused numerous times pushrod goes outer hole bellcrank arm holes 4 hardwood dowels drilled mount 5/32 drill cemented place epoxy Using Hobbypoxy II glue center section unit against outboard rib #9 tabs leading edge stiffener assure zero angle inci dence upper trailing edge half now glued place use Ambroid joint between center section trailing edge glued 5-minute epoxy point bladder tube pacifier pod inserted using bladder tube cut length Estes BT 55 rocket body tube fit between outboard ribs #9 #5 Use paper punch punch upper lower vent holes large bladder exit hole Cap vertical grain 4 balsa caps Cement bladder tube place ribs #5 #6 and#7thenaddthepartsofoutboard 120 Model Aviation OVERSEAS EXHIBITORS CORDIALLY INVIIED INTERNATIONAL MODELER SHOW eox 127 COSTA MESA CA 92627 17141 548-4700 rib #8 Use 1/16-in scrap filler vent holes provide anchorage Fas-Cal pacifier pod used fashion 1/64 plywood wall a end caps small vent hole bottom outboard corner shown Glue outboard rib #9 glue outboard rib #8 sandwiching place Sheet center section 1 / 16 sheet Make sure glue sheeting center rib unit epoxy have followed instructions whole center rib unit sheeting over glued together epoxy technique have arrived after years crashes rough flying feel fairly massive center section helps damp engine vibration also prevents loosening monoboom-wing junction repeated hard maneuvering crashes wing tips now glued place leadout guides glued sewn inboard tip Construction tall section beglns hinge have shown hinge piece plans four separate plywood parts sandwiching 3/32 o d brass tube can built way desired actually make up 12-in strips brass tubing sandwiched between plywood cut hinge out strip aug saw Epoxy used fabricate hinge After hinge made wire axle brass tubing spacers added bent shape cemented pre-airfoiled stabilator cloth tape epoxied over tubing spacers stabilator leading edge pre-airfoil stabilator drawing ball-point pen midline around perimeter free-hand sanding shape electric drill sander takes about two minutes beats hand sanding stab shape sanding block medium-hard 1-in sq balsamonoboomis cut shape aug saw hinge cemented aligning trailing edge stab perpendicular monoboom drafting triangle Add large nylon control horn finish tall assembly epoxy palnt Rein force monoboom circumferencial loop fiberglass tape just aft wing slot rear binge glued Cover wing carefully Fas-Cal trying lay Fas-Cal surfaces same amount tension initially helps prevent warps due uneven tension F as-Cal after shrunk After wing covered shrunk replace jig remove warp has occurred during covering process holding pressure against warp re-ironing Fas-Cal ajig used gross warps can detected eyeballing along trailing edge finish inside bladder tube filling clear dope pouring out though dope fuel-proof some other finishing products such epoxy paint epoxy palnt can turn small speck sawdust sharp flaw inner surface bladder tube will puncture bladder consistentiy motor mount nacelle filler blocks cemented epoxy mount sanded shape drill sander mask off center section doing prevent slip sander ruining plane use epoxy paint fiberglass cloth finish mount Now excise covering sheeting monoboom will glued perforate sheeting times pin through center rib Epoxy monoboom wing Hobbypoxy Formula IL allow plenty working time get tail aligned wing Sight down trailing edge both wing stab rear align roll axis Use ruler equalize distance between wing trailing edge stabilator trailing edge SoIa FHm EXCLUSIVE LOW-HEAT COVERING FOR FOAM & BALSA FLYING MODELS flexible ble fuel proof lightweight pacIiu Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 COMPLETE THIS FORM AND ATrACH MAILING 1 LABEL FROM RECENT ISSUE K____ LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscriptIon rates $1600 12 months Canada United States pousessionselsewhere $1800 NAME ADDRESS CITY/STATEZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW. WASHINGTON DC 20005 December 1979 121 TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA HAND SELECTED PRECISION SANDED SHEETS KS DOWELS S TRIANGLES KS PLANKS planform alignment Install large nylon control horn Kwik Link wire pushrod guide omit pushrod guide because aerodynamic force stab during outside maneuvers will cause pushrod bowing less effective control outside maneuvers Slow Combat version uses same wing has standard balsa fuselage standard type nose Two pushrod guides required along long fuselage plane should balance motor prop installed 185% chord 1 -in rear leading edge bladder tube placed exactly along line prevent change center gravity fuel runs out center gravity second hole top control horn good starting point Fast Combat version should weigh 8 9 oz engine FAT version 8 8 oz Select slightly lighter wood FAT version Power Fast Slow Rongeurs MK III Fox Combat Special 25% nitro head clearance set 019 Power FAT version favorite high perforniance 151 like Fox 15 Take test flight check warps thrust misalignment usually minimal care taken during construction Rongeur will provide durable cheap easy build easy repair combat plane stable enough fly eyes-off yet tight turning enough competition hundreds others too numerous mention Joes impressive model faithfully duplicates unique features kind aircraft scored 258 static points tops Senior class Past wins include five first places second including first Junior Preci sion Scale 75 77 Nats B-25 scratch-built ves wingspan 25 5/16 inches overall length 21 inches According Joe model weighs pound half two mufflerized Cox 049 Space Hoppers flies 45 feet line flies either engine controlled Stanzel Stunt Master Monoline control unit entire model made balsa solid wings tail rudders hollowed-out fuselage used Aero-Gloss finish entire plane blue-tone white blue nacelle areas Dale adds interesting story relating Joes B-25 5X4 3-bladed props necessary extend flying time miscalculated tank sizes would fly about eight laps 50X016 line 5X3 props So slowed engine down 4-in pitch cut flying line down 45 feet runs about 12 14 laps both engines configuration Inclosing Im thrilled able feature up-close look two young competitors outstanding models because believe characteristic CL Scale modelings greatest strengths continued partici pation Junior Senior age modelers CL Scale degree seen other mode Scale flying Nationals have attended Junior Senior age contestants accounted between 40 50 percent total entries Its refreshing contrast trends noticeable other AMA events Scale Model Research Photos name service recently started Dale Willoughby make quality color photo packs unique fullscale aircraft available scale modelers Dale travels lot whenever possible photographs outstanding home-builts restored antiques interesting airplanes types encoun ters airports fly-ins museums result ing photo packs offers contain numerous views same subject aircraft crucial angies photo list #2 have just received describes packs 57 different aircraft including Wittman Tailwind Flying Flea Lockheed Orion P-26 Peashooter PT-22 Grumman Duck P-38s P-S P-40E on packs vary $550 $1750 per set contain 9 33 top quality color photos prints full 3X5A size 3AX5 means get full prints everything standard 35-mm negatives no spinners chopped off missing wing tips ordinarily free copy latest list send stamped self-addressed long envelope Dale Willoughby Scale Model Research Photos PO Box 675 Orange CA 92666 Now flying season winding down hope youll have time send some photos drawings ideas comments use column need contribution keep space interesting informative Dont forget ModelAviation will pay $5 item printed Mike Gretz Box 162 Montezuma L4 50171 CL Navy Carrier/Perry continued oage 37 slides feeler gage stock has advantage being available thickness desired use stock 0025 0030 depending thickness saw used slide very easily shaped using Dremel tool tungsten-carbide bits cut-off wheels cut-off wheel used router attachment excellent way make initial cut reduce slide approximate width desired Final trimming width should done drawing edge slide along file careful keep sides slide paralleL final polishing 320 grit finer paper should allow slide move freely still provide good seal opening slide should least large exhaust ports cylinder Larger betterwithin limits imposed size exhaust stack amount throttle move ment available need keep exhaust slide out back prop taper opening necessary provide manageable 122 Model Aviation GET ORGANIZED CL Scale/Gretz Hee 5 set 4 sia4y tiles hotds 4 yeas ot youi tavoite 8 t magazines continued page 35 4 MAG FILES $495 Send $496 plan $100 postage handling DOM INDUSTRIES PO BOX 388-K DOVER NH 03820 GEE BEE Z DECALS ALL NUMBERS 2in 1 SCALE & LETTERING EXCEPT THOSE OF THE WINGS GRANGER$4 95 POST WILLIAMS t8t PAWNEESTOSET SAN MARCOS CA F0RNA92069
Edition: Model Aviation - 1979/12
Page Numbers: 32, 33, 34, 120, 121, 122
Designed expressly Fox MK Ill Combat Special Fast Slow Combat Fox 15 orsimilarengine FAI state-ofthe-art design durable cheap easy build repair stable enough fly eyes-off yet tight turning enough competition 0 Chuck Rudner THE introduction Fox MK III Combat Special has done lot help popularity control-line combat since capable 120mph speeds box-stock configuration Due greater weight engine relative previously dominant Supertigre 35s currently available kits two pre viously published built-up balsa designs Buck staff Wilkens both MA obsolete due insufficient wing area allow adequate turn ing capabilities Several years ago tired building more complex planes sheeted leading edges cap strips etc time started develop simple durable cheap combat plane ade quate wing area new Fox MK III allow competitive turning ability drew simpler construction methods Wooten Voodoo utilizing pre-formed Pactra leading edges split-vee 1/16 sheet trailing edges Rather using spars plane makes use pro32 Model Aviation ne avu u-am versions raciyier version requires rearward position 0 leadouts Inboard tip due lack outboard wing weight effect fuel loadwith bladder systems effect present FUILSIZEPLANSAVAILABLE AGE 128 QFAA SE PA EOBeAT SAFE L37ZOKZI BA RH PUPC ENASPC PANE PA ERN PEE FORUFA PACPA CE COAC ERALSA ROSA AURA ERS ON SOASUARSUSES AZ NA JAPSE RU Jo ESTES ER SR HOCEE ILCRSALSA SSPET HIS PATREBA UIR BALSAETCH NAB HPFBSE6S SBBEH COMBAT ICASF FEE EIEU CS CLOTS TURF RON GEUR DESIGNED BY CHUCK RUDNER CROWS RE JOE OFMURCO jTRAIOSS FUSE ERFORCELEE IESALSAAUINE SOrB BALSA CRA FONFLUAF SA AFAAARB BALSA SRAO ORBALSA H REAP iOi~POSIRIOR OF CA UOAFLS AREOE CAg]SEA CO BALSA AS SLOW COMBAT VERSION CASULSA OSASTFO FOR CLAURT F STIFFENERfIR ALA PS S - gressive rib spacing heavy plastic film cover mg FasCal After perfecting design fast combat plane tried sanie wing Slow FAI Combat have quite pleased results FAI version main design used win place 1978 US FAL Combat team three versions have placed local Combat events flexibility strong center section Rongeur combine give durability better seemingly substantial designs leading edge stiffener struc turally tapered trailing edge insure structural break crash will occur inboard outboard center section Thus damaged wing easily replaced stripping remaining lead ing edge center section stiffener midline adding new wing half much easier building whole new plane done properly does add mea surably planes weight fast FAI versions can built either bladder pacifier type pressurized fuel systems Slow Combat version conforms current five-inch nose rule have found Pactra leading edges bluntest shape available pre-formed leading edge consistently straight come variety weights use medium-hard Fast Slow versions medium weight FAI version leading edge too light wing will fold during hard maneuvering Construction Begin cutting iX maple motor mounts shape Also cut -in balsa vertical grain center block cut bellcrank slot yet Use Hobbypoxy Formula II other slow-drying epoxy strength Force epoxy grain center block before gluing C-clamping maple mounts center block Place whole assembly outboard face down flat surface covered plastic food wrap insure true surface engine mounting flanges assembly drying mark out rib spacing leading edge felt-tip marker use ball-point pen pencil balsa can cause desits weaken part Cut leading edge stiffener 3/32 ply Taper ends electric drill sander minimize stress concentration area leading edge Glue leading edge stiffener flat rear surface leading edge lining up center section rib marks drew leading edge Note stiffener -in narrower December 1979 33 MORE SEW VHS PUS UP NPIFFFNFH 7 utnur S oummuing jig wiin S~dF1 iuLr-~n Br tube cutting jig rib blocks removBd covered model fits back jig allOwirrv dBwarpingmild warps often accrue after ironing films such FasCal Note centerSiun parts leading edge stripper foregroundalso plywood template immediate foreground Jig easy repairs rear surface leading edge leave equal 1/16-in space top bottom edge allows center planking fit down flush leading edge Take time evenly aligning stiffener onto leading edge cause center tabs stiffener will later fit between mounts insure zero angle incidence use epoxy also waiting epoxy dry cut trailing edge pieces medium-hard 1/16 sheet Full length 36-in balsa used center section offset slightly toward outboard wing provide longer inboard outboard panel Thus top bottom trailing edges interchangeable once inner bevel created rear trailing edge pre-bevel trailing edges begin plac ing long stralght piece glass steel 36-in steel rule along edge workbench Lay rear edge trailing edge guide Use masking tape cover rearward-most 7/16-in tape should secure balsa glass steel guide rear edges being flush use electric drill sander run length trailing edge sanding between tape glass steel edge have used technique since 1960s find takes minute Pre-beveling increases strength structure gives sharp trailing edge theoretically aerodynamic advantage Mark rib spacing lower trailing edge fine tip-felt pen Cut out main ribs 1/16 sheet balsa Use scrap created cuffing out trailing edges two tip ribs begin root ribs until medium-hard scrap runs out Cut remaining ribs lighter weight 1/16 balsa main ribs basically same shape however trailing edge notches get progres sively wider toward root ribs can cut stack using band saw separately make differential trailing edge notches find easier use 1/16 plywood pattern indi vidually numbered notches hand cut ribs * 11 blade ribs simple shape no spar hole can done fast stacking balsa cut once plywood pattern has leadout hole positions drilled numbered inboard ribs #1 through #7 bladder tube hole cut outboard ribs #6 #7 use regular paper punch cut leadout holes after marking hole positions pattern Now cut four center ribs #8 #9 wing tips t balsa Cut slot mount assembly bellcrank mount Glue inboard center rib #9 engine mount Continued page 120 34 Model Aviation Fuel systems Left top B Heavy-duty pacifier reverse-fill surgical tube bladder standard surgical tube bladder double pen-bladder Right top B Inboard collapsing bag tank made Playtex nurser chicken-hopper tank Uniflow modification Randys 3Yz-oz tank top pressure measuring leak-down pressure various bladders thought combat simple Jig tor building aii versions toregrouno prior assemoiysiioing leading-edge holders rubberband tensioners hold airframe tight against TE jig backstops Removable rib blocks shown place inboard wing removed outboard Trailing edge pattern leadout jig jig fect alignmenthelps prevent unwanted up- dow,-thrust motor mount FAI versions shown THE THIRD ANNUAL iii JANUARY 12 & 13 1980 SEE THE LATEST PRODUCTS AND VISIT WITH MAJOR MANUFACTURERS AND DISTRIBUTORS OF MODEL AIRCRAFT* MODEL ENGINES MODEL BOATS\PeRADIOCONTROLSYSTEMS MODELCARSeMODELINGACCESSORIES INDOOR DEMONSTRATIONS STATIC DISPLAY COMPETITION IN MANY CATEGORIES Rongeu r/Rud ner continued page 34 assembly its inboard side very important position rib parallel axis motor mount insure will no up- downthrust motor mount use small balsa jig fixture aligning parts 5-minute epoxy gluing After assembly dry horizontal grain t center rib filler interlocking plywood bellcrank mount glued mount assembly epoxy point wing built omitting out board ribs #s 5 6 7 8 bladder tube versions outboard rib #8 pacifier ver sions use Hot Stuff microballoons fix two tip ribs outboard rib #9 inboard rib #7 leading trailing edges Ambroid will suffice cementing remaining ribs place Included template 1/16 sheet main ribs met-tru device Carl Goldberg Voodoo kits small tab can included inboard outboard ribs #1 #7 ribs should pre-perforated snap off junction between tab rib after construction allows wing built warp-free flat surface use specially constructed jig building planes eliminates need tabs Building jig allows ease both initial construction repairing also allows detection correction warps can created warp-free structure covering shrinking Fas-Cal essen tial parts jig shown plans next step mounting engine motor mounts location shown plans mm m mm inmm w m i~YtIL OW FEVER A1 I VEOTICE MFEVEfr has won *pqwhld I euca dwlng taut two yeses yyheU Iurns Ibm ALl OTHER RACERS co*hwdfltI o-s sport fiylau FEATUWESIjI Wsts se spin KIt hawinCgtU5 Thmui1 qucId 600 moksg *1W YVW mpor deiw b1W Eu. *1UIA Wins moti hA g Posi N*ininffibbd mets "I YiinuUe uIas~w r Paid o4fMlmu1 DEALER AUDOWTUUT IWVITUOPOstPaid PRODUCTS 681 WelierburnAw,msNrk MD 21146 mm align motor zero thrust remove glow plug use junk prop bolted onto crankshaft Attach heavy thread tip prop string attach clamp-type paper clip can slide along Adjust up- down-thrust engine attempting equalize distance upper lower maximums prop arc tothe trailing edge tip center rib adjusting thrust line up down checking distance string Rotate prop 1800 time checking distance along string paper clip zero up down thrust achieved bolt englne 4/40 machine screws blind mounts Remove englne center section hook up 2-in belicrank leadouts 1/16 music wire pushrod bellcrank mount use 125-pound-test Perfect braided leadout bushed bellcrank brass tubing same control system can reused numerous times pushrod goes outer hole bellcrank arm holes 4 hardwood dowels drilled mount 5/32 drill cemented place epoxy Using Hobbypoxy II glue center section unit against outboard rib #9 tabs leading edge stiffener assure zero angle inci dence upper trailing edge half now glued place use Ambroid joint between center section trailing edge glued 5-minute epoxy point bladder tube pacifier pod inserted using bladder tube cut length Estes BT 55 rocket body tube fit between outboard ribs #9 #5 Use paper punch punch upper lower vent holes large bladder exit hole Cap vertical grain 4 balsa caps Cement bladder tube place ribs #5 #6 and#7thenaddthepartsofoutboard 120 Model Aviation OVERSEAS EXHIBITORS CORDIALLY INVIIED INTERNATIONAL MODELER SHOW eox 127 COSTA MESA CA 92627 17141 548-4700 rib #8 Use 1/16-in scrap filler vent holes provide anchorage Fas-Cal pacifier pod used fashion 1/64 plywood wall a end caps small vent hole bottom outboard corner shown Glue outboard rib #9 glue outboard rib #8 sandwiching place Sheet center section 1 / 16 sheet Make sure glue sheeting center rib unit epoxy have followed instructions whole center rib unit sheeting over glued together epoxy technique have arrived after years crashes rough flying feel fairly massive center section helps damp engine vibration also prevents loosening monoboom-wing junction repeated hard maneuvering crashes wing tips now glued place leadout guides glued sewn inboard tip Construction tall section beglns hinge have shown hinge piece plans four separate plywood parts sandwiching 3/32 o d brass tube can built way desired actually make up 12-in strips brass tubing sandwiched between plywood cut hinge out strip aug saw Epoxy used fabricate hinge After hinge made wire axle brass tubing spacers added bent shape cemented pre-airfoiled stabilator cloth tape epoxied over tubing spacers stabilator leading edge pre-airfoil stabilator drawing ball-point pen midline around perimeter free-hand sanding shape electric drill sander takes about two minutes beats hand sanding stab shape sanding block medium-hard 1-in sq balsamonoboomis cut shape aug saw hinge cemented aligning trailing edge stab perpendicular monoboom drafting triangle Add large nylon control horn finish tall assembly epoxy palnt Rein force monoboom circumferencial loop fiberglass tape just aft wing slot rear binge glued Cover wing carefully Fas-Cal trying lay Fas-Cal surfaces same amount tension initially helps prevent warps due uneven tension F as-Cal after shrunk After wing covered shrunk replace jig remove warp has occurred during covering process holding pressure against warp re-ironing Fas-Cal ajig used gross warps can detected eyeballing along trailing edge finish inside bladder tube filling clear dope pouring out though dope fuel-proof some other finishing products such epoxy paint epoxy palnt can turn small speck sawdust sharp flaw inner surface bladder tube will puncture bladder consistentiy motor mount nacelle filler blocks cemented epoxy mount sanded shape drill sander mask off center section doing prevent slip sander ruining plane use epoxy paint fiberglass cloth finish mount Now excise covering sheeting monoboom will glued perforate sheeting times pin through center rib Epoxy monoboom wing Hobbypoxy Formula IL allow plenty working time get tail aligned wing Sight down trailing edge both wing stab rear align roll axis Use ruler equalize distance between wing trailing edge stabilator trailing edge SoIa FHm EXCLUSIVE LOW-HEAT COVERING FOR FOAM & BALSA FLYING MODELS flexible ble fuel proof lightweight pacIiu Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 COMPLETE THIS FORM AND ATrACH MAILING 1 LABEL FROM RECENT ISSUE K____ LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscriptIon rates $1600 12 months Canada United States pousessionselsewhere $1800 NAME ADDRESS CITY/STATEZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW. WASHINGTON DC 20005 December 1979 121 TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA HAND SELECTED PRECISION SANDED SHEETS KS DOWELS S TRIANGLES KS PLANKS planform alignment Install large nylon control horn Kwik Link wire pushrod guide omit pushrod guide because aerodynamic force stab during outside maneuvers will cause pushrod bowing less effective control outside maneuvers Slow Combat version uses same wing has standard balsa fuselage standard type nose Two pushrod guides required along long fuselage plane should balance motor prop installed 185% chord 1 -in rear leading edge bladder tube placed exactly along line prevent change center gravity fuel runs out center gravity second hole top control horn good starting point Fast Combat version should weigh 8 9 oz engine FAT version 8 8 oz Select slightly lighter wood FAT version Power Fast Slow Rongeurs MK III Fox Combat Special 25% nitro head clearance set 019 Power FAT version favorite high perforniance 151 like Fox 15 Take test flight check warps thrust misalignment usually minimal care taken during construction Rongeur will provide durable cheap easy build easy repair combat plane stable enough fly eyes-off yet tight turning enough competition hundreds others too numerous mention Joes impressive model faithfully duplicates unique features kind aircraft scored 258 static points tops Senior class Past wins include five first places second including first Junior Preci sion Scale 75 77 Nats B-25 scratch-built ves wingspan 25 5/16 inches overall length 21 inches According Joe model weighs pound half two mufflerized Cox 049 Space Hoppers flies 45 feet line flies either engine controlled Stanzel Stunt Master Monoline control unit entire model made balsa solid wings tail rudders hollowed-out fuselage used Aero-Gloss finish entire plane blue-tone white blue nacelle areas Dale adds interesting story relating Joes B-25 5X4 3-bladed props necessary extend flying time miscalculated tank sizes would fly about eight laps 50X016 line 5X3 props So slowed engine down 4-in pitch cut flying line down 45 feet runs about 12 14 laps both engines configuration Inclosing Im thrilled able feature up-close look two young competitors outstanding models because believe characteristic CL Scale modelings greatest strengths continued partici pation Junior Senior age modelers CL Scale degree seen other mode Scale flying Nationals have attended Junior Senior age contestants accounted between 40 50 percent total entries Its refreshing contrast trends noticeable other AMA events Scale Model Research Photos name service recently started Dale Willoughby make quality color photo packs unique fullscale aircraft available scale modelers Dale travels lot whenever possible photographs outstanding home-builts restored antiques interesting airplanes types encoun ters airports fly-ins museums result ing photo packs offers contain numerous views same subject aircraft crucial angies photo list #2 have just received describes packs 57 different aircraft including Wittman Tailwind Flying Flea Lockheed Orion P-26 Peashooter PT-22 Grumman Duck P-38s P-S P-40E on packs vary $550 $1750 per set contain 9 33 top quality color photos prints full 3X5A size 3AX5 means get full prints everything standard 35-mm negatives no spinners chopped off missing wing tips ordinarily free copy latest list send stamped self-addressed long envelope Dale Willoughby Scale Model Research Photos PO Box 675 Orange CA 92666 Now flying season winding down hope youll have time send some photos drawings ideas comments use column need contribution keep space interesting informative Dont forget ModelAviation will pay $5 item printed Mike Gretz Box 162 Montezuma L4 50171 CL Navy Carrier/Perry continued oage 37 slides feeler gage stock has advantage being available thickness desired use stock 0025 0030 depending thickness saw used slide very easily shaped using Dremel tool tungsten-carbide bits cut-off wheels cut-off wheel used router attachment excellent way make initial cut reduce slide approximate width desired Final trimming width should done drawing edge slide along file careful keep sides slide paralleL final polishing 320 grit finer paper should allow slide move freely still provide good seal opening slide should least large exhaust ports cylinder Larger betterwithin limits imposed size exhaust stack amount throttle move ment available need keep exhaust slide out back prop taper opening necessary provide manageable 122 Model Aviation GET ORGANIZED CL Scale/Gretz Hee 5 set 4 sia4y tiles hotds 4 yeas ot youi tavoite 8 t magazines continued page 35 4 MAG FILES $495 Send $496 plan $100 postage handling DOM INDUSTRIES PO BOX 388-K DOVER NH 03820 GEE BEE Z DECALS ALL NUMBERS 2in 1 SCALE & LETTERING EXCEPT THOSE OF THE WINGS GRANGER$4 95 POST WILLIAMS t8t PAWNEESTOSET SAN MARCOS CA F0RNA92069
Edition: Model Aviation - 1979/12
Page Numbers: 32, 33, 34, 120, 121, 122
Designed expressly Fox MK Ill Combat Special Fast Slow Combat Fox 15 orsimilarengine FAI state-ofthe-art design durable cheap easy build repair stable enough fly eyes-off yet tight turning enough competition 0 Chuck Rudner THE introduction Fox MK III Combat Special has done lot help popularity control-line combat since capable 120mph speeds box-stock configuration Due greater weight engine relative previously dominant Supertigre 35s currently available kits two pre viously published built-up balsa designs Buck staff Wilkens both MA obsolete due insufficient wing area allow adequate turn ing capabilities Several years ago tired building more complex planes sheeted leading edges cap strips etc time started develop simple durable cheap combat plane ade quate wing area new Fox MK III allow competitive turning ability drew simpler construction methods Wooten Voodoo utilizing pre-formed Pactra leading edges split-vee 1/16 sheet trailing edges Rather using spars plane makes use pro32 Model Aviation ne avu u-am versions raciyier version requires rearward position 0 leadouts Inboard tip due lack outboard wing weight effect fuel loadwith bladder systems effect present FUILSIZEPLANSAVAILABLE AGE 128 QFAA SE PA EOBeAT SAFE L37ZOKZI BA RH PUPC ENASPC PANE PA ERN PEE FORUFA PACPA CE COAC ERALSA ROSA AURA ERS ON SOASUARSUSES AZ NA JAPSE RU Jo ESTES ER SR HOCEE ILCRSALSA SSPET HIS PATREBA UIR BALSAETCH NAB HPFBSE6S SBBEH COMBAT ICASF FEE EIEU CS CLOTS TURF RON GEUR DESIGNED BY CHUCK RUDNER CROWS RE JOE OFMURCO jTRAIOSS FUSE ERFORCELEE IESALSAAUINE SOrB BALSA CRA FONFLUAF SA AFAAARB BALSA SRAO ORBALSA H REAP iOi~POSIRIOR OF CA UOAFLS AREOE CAg]SEA CO BALSA AS SLOW COMBAT VERSION CASULSA OSASTFO FOR CLAURT F STIFFENERfIR ALA PS S - gressive rib spacing heavy plastic film cover mg FasCal After perfecting design fast combat plane tried sanie wing Slow FAI Combat have quite pleased results FAI version main design used win place 1978 US FAL Combat team three versions have placed local Combat events flexibility strong center section Rongeur combine give durability better seemingly substantial designs leading edge stiffener struc turally tapered trailing edge insure structural break crash will occur inboard outboard center section Thus damaged wing easily replaced stripping remaining lead ing edge center section stiffener midline adding new wing half much easier building whole new plane done properly does add mea surably planes weight fast FAI versions can built either bladder pacifier type pressurized fuel systems Slow Combat version conforms current five-inch nose rule have found Pactra leading edges bluntest shape available pre-formed leading edge consistently straight come variety weights use medium-hard Fast Slow versions medium weight FAI version leading edge too light wing will fold during hard maneuvering Construction Begin cutting iX maple motor mounts shape Also cut -in balsa vertical grain center block cut bellcrank slot yet Use Hobbypoxy Formula II other slow-drying epoxy strength Force epoxy grain center block before gluing C-clamping maple mounts center block Place whole assembly outboard face down flat surface covered plastic food wrap insure true surface engine mounting flanges assembly drying mark out rib spacing leading edge felt-tip marker use ball-point pen pencil balsa can cause desits weaken part Cut leading edge stiffener 3/32 ply Taper ends electric drill sander minimize stress concentration area leading edge Glue leading edge stiffener flat rear surface leading edge lining up center section rib marks drew leading edge Note stiffener -in narrower December 1979 33 MORE SEW VHS PUS UP NPIFFFNFH 7 utnur S oummuing jig wiin S~dF1 iuLr-~n Br tube cutting jig rib blocks removBd covered model fits back jig allOwirrv dBwarpingmild warps often accrue after ironing films such FasCal Note centerSiun parts leading edge stripper foregroundalso plywood template immediate foreground Jig easy repairs rear surface leading edge leave equal 1/16-in space top bottom edge allows center planking fit down flush leading edge Take time evenly aligning stiffener onto leading edge cause center tabs stiffener will later fit between mounts insure zero angle incidence use epoxy also waiting epoxy dry cut trailing edge pieces medium-hard 1/16 sheet Full length 36-in balsa used center section offset slightly toward outboard wing provide longer inboard outboard panel Thus top bottom trailing edges interchangeable once inner bevel created rear trailing edge pre-bevel trailing edges begin plac ing long stralght piece glass steel 36-in steel rule along edge workbench Lay rear edge trailing edge guide Use masking tape cover rearward-most 7/16-in tape should secure balsa glass steel guide rear edges being flush use electric drill sander run length trailing edge sanding between tape glass steel edge have used technique since 1960s find takes minute Pre-beveling increases strength structure gives sharp trailing edge theoretically aerodynamic advantage Mark rib spacing lower trailing edge fine tip-felt pen Cut out main ribs 1/16 sheet balsa Use scrap created cuffing out trailing edges two tip ribs begin root ribs until medium-hard scrap runs out Cut remaining ribs lighter weight 1/16 balsa main ribs basically same shape however trailing edge notches get progres sively wider toward root ribs can cut stack using band saw separately make differential trailing edge notches find easier use 1/16 plywood pattern indi vidually numbered notches hand cut ribs * 11 blade ribs simple shape no spar hole can done fast stacking balsa cut once plywood pattern has leadout hole positions drilled numbered inboard ribs #1 through #7 bladder tube hole cut outboard ribs #6 #7 use regular paper punch cut leadout holes after marking hole positions pattern Now cut four center ribs #8 #9 wing tips t balsa Cut slot mount assembly bellcrank mount Glue inboard center rib #9 engine mount Continued page 120 34 Model Aviation Fuel systems Left top B Heavy-duty pacifier reverse-fill surgical tube bladder standard surgical tube bladder double pen-bladder Right top B Inboard collapsing bag tank made Playtex nurser chicken-hopper tank Uniflow modification Randys 3Yz-oz tank top pressure measuring leak-down pressure various bladders thought combat simple Jig tor building aii versions toregrouno prior assemoiysiioing leading-edge holders rubberband tensioners hold airframe tight against TE jig backstops Removable rib blocks shown place inboard wing removed outboard Trailing edge pattern leadout jig jig fect alignmenthelps prevent unwanted up- dow,-thrust motor mount FAI versions shown THE THIRD ANNUAL iii JANUARY 12 & 13 1980 SEE THE LATEST PRODUCTS AND VISIT WITH MAJOR MANUFACTURERS AND DISTRIBUTORS OF MODEL AIRCRAFT* MODEL ENGINES MODEL BOATS\PeRADIOCONTROLSYSTEMS MODELCARSeMODELINGACCESSORIES INDOOR DEMONSTRATIONS STATIC DISPLAY COMPETITION IN MANY CATEGORIES Rongeu r/Rud ner continued page 34 assembly its inboard side very important position rib parallel axis motor mount insure will no up- downthrust motor mount use small balsa jig fixture aligning parts 5-minute epoxy gluing After assembly dry horizontal grain t center rib filler interlocking plywood bellcrank mount glued mount assembly epoxy point wing built omitting out board ribs #s 5 6 7 8 bladder tube versions outboard rib #8 pacifier ver sions use Hot Stuff microballoons fix two tip ribs outboard rib #9 inboard rib #7 leading trailing edges Ambroid will suffice cementing remaining ribs place Included template 1/16 sheet main ribs met-tru device Carl Goldberg Voodoo kits small tab can included inboard outboard ribs #1 #7 ribs should pre-perforated snap off junction between tab rib after construction allows wing built warp-free flat surface use specially constructed jig building planes eliminates need tabs Building jig allows ease both initial construction repairing also allows detection correction warps can created warp-free structure covering shrinking Fas-Cal essen tial parts jig shown plans next step mounting engine motor mounts location shown plans mm m mm inmm w m i~YtIL OW FEVER A1 I VEOTICE MFEVEfr has won *pqwhld I euca dwlng taut two yeses yyheU Iurns Ibm ALl OTHER RACERS co*hwdfltI o-s sport fiylau FEATUWESIjI Wsts se spin KIt hawinCgtU5 Thmui1 qucId 600 moksg *1W YVW mpor deiw b1W Eu. *1UIA Wins moti hA g Posi N*ininffibbd mets "I YiinuUe uIas~w r Paid o4fMlmu1 DEALER AUDOWTUUT IWVITUOPOstPaid PRODUCTS 681 WelierburnAw,msNrk MD 21146 mm align motor zero thrust remove glow plug use junk prop bolted onto crankshaft Attach heavy thread tip prop string attach clamp-type paper clip can slide along Adjust up- down-thrust engine attempting equalize distance upper lower maximums prop arc tothe trailing edge tip center rib adjusting thrust line up down checking distance string Rotate prop 1800 time checking distance along string paper clip zero up down thrust achieved bolt englne 4/40 machine screws blind mounts Remove englne center section hook up 2-in belicrank leadouts 1/16 music wire pushrod bellcrank mount use 125-pound-test Perfect braided leadout bushed bellcrank brass tubing same control system can reused numerous times pushrod goes outer hole bellcrank arm holes 4 hardwood dowels drilled mount 5/32 drill cemented place epoxy Using Hobbypoxy II glue center section unit against outboard rib #9 tabs leading edge stiffener assure zero angle inci dence upper trailing edge half now glued place use Ambroid joint between center section trailing edge glued 5-minute epoxy point bladder tube pacifier pod inserted using bladder tube cut length Estes BT 55 rocket body tube fit between outboard ribs #9 #5 Use paper punch punch upper lower vent holes large bladder exit hole Cap vertical grain 4 balsa caps Cement bladder tube place ribs #5 #6 and#7thenaddthepartsofoutboard 120 Model Aviation OVERSEAS EXHIBITORS CORDIALLY INVIIED INTERNATIONAL MODELER SHOW eox 127 COSTA MESA CA 92627 17141 548-4700 rib #8 Use 1/16-in scrap filler vent holes provide anchorage Fas-Cal pacifier pod used fashion 1/64 plywood wall a end caps small vent hole bottom outboard corner shown Glue outboard rib #9 glue outboard rib #8 sandwiching place Sheet center section 1 / 16 sheet Make sure glue sheeting center rib unit epoxy have followed instructions whole center rib unit sheeting over glued together epoxy technique have arrived after years crashes rough flying feel fairly massive center section helps damp engine vibration also prevents loosening monoboom-wing junction repeated hard maneuvering crashes wing tips now glued place leadout guides glued sewn inboard tip Construction tall section beglns hinge have shown hinge piece plans four separate plywood parts sandwiching 3/32 o d brass tube can built way desired actually make up 12-in strips brass tubing sandwiched between plywood cut hinge out strip aug saw Epoxy used fabricate hinge After hinge made wire axle brass tubing spacers added bent shape cemented pre-airfoiled stabilator cloth tape epoxied over tubing spacers stabilator leading edge pre-airfoil stabilator drawing ball-point pen midline around perimeter free-hand sanding shape electric drill sander takes about two minutes beats hand sanding stab shape sanding block medium-hard 1-in sq balsamonoboomis cut shape aug saw hinge cemented aligning trailing edge stab perpendicular monoboom drafting triangle Add large nylon control horn finish tall assembly epoxy palnt Rein force monoboom circumferencial loop fiberglass tape just aft wing slot rear binge glued Cover wing carefully Fas-Cal trying lay Fas-Cal surfaces same amount tension initially helps prevent warps due uneven tension F as-Cal after shrunk After wing covered shrunk replace jig remove warp has occurred during covering process holding pressure against warp re-ironing Fas-Cal ajig used gross warps can detected eyeballing along trailing edge finish inside bladder tube filling clear dope pouring out though dope fuel-proof some other finishing products such epoxy paint epoxy palnt can turn small speck sawdust sharp flaw inner surface bladder tube will puncture bladder consistentiy motor mount nacelle filler blocks cemented epoxy mount sanded shape drill sander mask off center section doing prevent slip sander ruining plane use epoxy paint fiberglass cloth finish mount Now excise covering sheeting monoboom will glued perforate sheeting times pin through center rib Epoxy monoboom wing Hobbypoxy Formula IL allow plenty working time get tail aligned wing Sight down trailing edge both wing stab rear align roll axis Use ruler equalize distance between wing trailing edge stabilator trailing edge SoIa FHm EXCLUSIVE LOW-HEAT COVERING FOR FOAM & BALSA FLYING MODELS flexible ble fuel proof lightweight pacIiu Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 COMPLETE THIS FORM AND ATrACH MAILING 1 LABEL FROM RECENT ISSUE K____ LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscriptIon rates $1600 12 months Canada United States pousessionselsewhere $1800 NAME ADDRESS CITY/STATEZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW. WASHINGTON DC 20005 December 1979 121 TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA HAND SELECTED PRECISION SANDED SHEETS KS DOWELS S TRIANGLES KS PLANKS planform alignment Install large nylon control horn Kwik Link wire pushrod guide omit pushrod guide because aerodynamic force stab during outside maneuvers will cause pushrod bowing less effective control outside maneuvers Slow Combat version uses same wing has standard balsa fuselage standard type nose Two pushrod guides required along long fuselage plane should balance motor prop installed 185% chord 1 -in rear leading edge bladder tube placed exactly along line prevent change center gravity fuel runs out center gravity second hole top control horn good starting point Fast Combat version should weigh 8 9 oz engine FAT version 8 8 oz Select slightly lighter wood FAT version Power Fast Slow Rongeurs MK III Fox Combat Special 25% nitro head clearance set 019 Power FAT version favorite high perforniance 151 like Fox 15 Take test flight check warps thrust misalignment usually minimal care taken during construction Rongeur will provide durable cheap easy build easy repair combat plane stable enough fly eyes-off yet tight turning enough competition hundreds others too numerous mention Joes impressive model faithfully duplicates unique features kind aircraft scored 258 static points tops Senior class Past wins include five first places second including first Junior Preci sion Scale 75 77 Nats B-25 scratch-built ves wingspan 25 5/16 inches overall length 21 inches According Joe model weighs pound half two mufflerized Cox 049 Space Hoppers flies 45 feet line flies either engine controlled Stanzel Stunt Master Monoline control unit entire model made balsa solid wings tail rudders hollowed-out fuselage used Aero-Gloss finish entire plane blue-tone white blue nacelle areas Dale adds interesting story relating Joes B-25 5X4 3-bladed props necessary extend flying time miscalculated tank sizes would fly about eight laps 50X016 line 5X3 props So slowed engine down 4-in pitch cut flying line down 45 feet runs about 12 14 laps both engines configuration Inclosing Im thrilled able feature up-close look two young competitors outstanding models because believe characteristic CL Scale modelings greatest strengths continued partici pation Junior Senior age modelers CL Scale degree seen other mode Scale flying Nationals have attended Junior Senior age contestants accounted between 40 50 percent total entries Its refreshing contrast trends noticeable other AMA events Scale Model Research Photos name service recently started Dale Willoughby make quality color photo packs unique fullscale aircraft available scale modelers Dale travels lot whenever possible photographs outstanding home-builts restored antiques interesting airplanes types encoun ters airports fly-ins museums result ing photo packs offers contain numerous views same subject aircraft crucial angies photo list #2 have just received describes packs 57 different aircraft including Wittman Tailwind Flying Flea Lockheed Orion P-26 Peashooter PT-22 Grumman Duck P-38s P-S P-40E on packs vary $550 $1750 per set contain 9 33 top quality color photos prints full 3X5A size 3AX5 means get full prints everything standard 35-mm negatives no spinners chopped off missing wing tips ordinarily free copy latest list send stamped self-addressed long envelope Dale Willoughby Scale Model Research Photos PO Box 675 Orange CA 92666 Now flying season winding down hope youll have time send some photos drawings ideas comments use column need contribution keep space interesting informative Dont forget ModelAviation will pay $5 item printed Mike Gretz Box 162 Montezuma L4 50171 CL Navy Carrier/Perry continued oage 37 slides feeler gage stock has advantage being available thickness desired use stock 0025 0030 depending thickness saw used slide very easily shaped using Dremel tool tungsten-carbide bits cut-off wheels cut-off wheel used router attachment excellent way make initial cut reduce slide approximate width desired Final trimming width should done drawing edge slide along file careful keep sides slide paralleL final polishing 320 grit finer paper should allow slide move freely still provide good seal opening slide should least large exhaust ports cylinder Larger betterwithin limits imposed size exhaust stack amount throttle move ment available need keep exhaust slide out back prop taper opening necessary provide manageable 122 Model Aviation GET ORGANIZED CL Scale/Gretz Hee 5 set 4 sia4y tiles hotds 4 yeas ot youi tavoite 8 t magazines continued page 35 4 MAG FILES $495 Send $496 plan $100 postage handling DOM INDUSTRIES PO BOX 388-K DOVER NH 03820 GEE BEE Z DECALS ALL NUMBERS 2in 1 SCALE & LETTERING EXCEPT THOSE OF THE WINGS GRANGER$4 95 POST WILLIAMS t8t PAWNEESTOSET SAN MARCOS CA F0RNA92069
Edition: Model Aviation - 1979/12
Page Numbers: 32, 33, 34, 120, 121, 122
Designed expressly Fox MK Ill Combat Special Fast Slow Combat Fox 15 orsimilarengine FAI state-ofthe-art design durable cheap easy build repair stable enough fly eyes-off yet tight turning enough competition 0 Chuck Rudner THE introduction Fox MK III Combat Special has done lot help popularity control-line combat since capable 120mph speeds box-stock configuration Due greater weight engine relative previously dominant Supertigre 35s currently available kits two pre viously published built-up balsa designs Buck staff Wilkens both MA obsolete due insufficient wing area allow adequate turn ing capabilities Several years ago tired building more complex planes sheeted leading edges cap strips etc time started develop simple durable cheap combat plane ade quate wing area new Fox MK III allow competitive turning ability drew simpler construction methods Wooten Voodoo utilizing pre-formed Pactra leading edges split-vee 1/16 sheet trailing edges Rather using spars plane makes use pro32 Model Aviation ne avu u-am versions raciyier version requires rearward position 0 leadouts Inboard tip due lack outboard wing weight effect fuel loadwith bladder systems effect present FUILSIZEPLANSAVAILABLE AGE 128 QFAA SE PA EOBeAT SAFE L37ZOKZI BA RH PUPC ENASPC PANE PA ERN PEE FORUFA PACPA CE COAC ERALSA ROSA AURA ERS ON SOASUARSUSES AZ NA JAPSE RU Jo ESTES ER SR HOCEE ILCRSALSA SSPET HIS PATREBA UIR BALSAETCH NAB HPFBSE6S SBBEH COMBAT ICASF FEE EIEU CS CLOTS TURF RON GEUR DESIGNED BY CHUCK RUDNER CROWS RE JOE OFMURCO jTRAIOSS FUSE ERFORCELEE IESALSAAUINE SOrB BALSA CRA FONFLUAF SA AFAAARB BALSA SRAO ORBALSA H REAP iOi~POSIRIOR OF CA UOAFLS AREOE CAg]SEA CO BALSA AS SLOW COMBAT VERSION CASULSA OSASTFO FOR CLAURT F STIFFENERfIR ALA PS S - gressive rib spacing heavy plastic film cover mg FasCal After perfecting design fast combat plane tried sanie wing Slow FAI Combat have quite pleased results FAI version main design used win place 1978 US FAL Combat team three versions have placed local Combat events flexibility strong center section Rongeur combine give durability better seemingly substantial designs leading edge stiffener struc turally tapered trailing edge insure structural break crash will occur inboard outboard center section Thus damaged wing easily replaced stripping remaining lead ing edge center section stiffener midline adding new wing half much easier building whole new plane done properly does add mea surably planes weight fast FAI versions can built either bladder pacifier type pressurized fuel systems Slow Combat version conforms current five-inch nose rule have found Pactra leading edges bluntest shape available pre-formed leading edge consistently straight come variety weights use medium-hard Fast Slow versions medium weight FAI version leading edge too light wing will fold during hard maneuvering Construction Begin cutting iX maple motor mounts shape Also cut -in balsa vertical grain center block cut bellcrank slot yet Use Hobbypoxy Formula II other slow-drying epoxy strength Force epoxy grain center block before gluing C-clamping maple mounts center block Place whole assembly outboard face down flat surface covered plastic food wrap insure true surface engine mounting flanges assembly drying mark out rib spacing leading edge felt-tip marker use ball-point pen pencil balsa can cause desits weaken part Cut leading edge stiffener 3/32 ply Taper ends electric drill sander minimize stress concentration area leading edge Glue leading edge stiffener flat rear surface leading edge lining up center section rib marks drew leading edge Note stiffener -in narrower December 1979 33 MORE SEW VHS PUS UP NPIFFFNFH 7 utnur S oummuing jig wiin S~dF1 iuLr-~n Br tube cutting jig rib blocks removBd covered model fits back jig allOwirrv dBwarpingmild warps often accrue after ironing films such FasCal Note centerSiun parts leading edge stripper foregroundalso plywood template immediate foreground Jig easy repairs rear surface leading edge leave equal 1/16-in space top bottom edge allows center planking fit down flush leading edge Take time evenly aligning stiffener onto leading edge cause center tabs stiffener will later fit between mounts insure zero angle incidence use epoxy also waiting epoxy dry cut trailing edge pieces medium-hard 1/16 sheet Full length 36-in balsa used center section offset slightly toward outboard wing provide longer inboard outboard panel Thus top bottom trailing edges interchangeable once inner bevel created rear trailing edge pre-bevel trailing edges begin plac ing long stralght piece glass steel 36-in steel rule along edge workbench Lay rear edge trailing edge guide Use masking tape cover rearward-most 7/16-in tape should secure balsa glass steel guide rear edges being flush use electric drill sander run length trailing edge sanding between tape glass steel edge have used technique since 1960s find takes minute Pre-beveling increases strength structure gives sharp trailing edge theoretically aerodynamic advantage Mark rib spacing lower trailing edge fine tip-felt pen Cut out main ribs 1/16 sheet balsa Use scrap created cuffing out trailing edges two tip ribs begin root ribs until medium-hard scrap runs out Cut remaining ribs lighter weight 1/16 balsa main ribs basically same shape however trailing edge notches get progres sively wider toward root ribs can cut stack using band saw separately make differential trailing edge notches find easier use 1/16 plywood pattern indi vidually numbered notches hand cut ribs * 11 blade ribs simple shape no spar hole can done fast stacking balsa cut once plywood pattern has leadout hole positions drilled numbered inboard ribs #1 through #7 bladder tube hole cut outboard ribs #6 #7 use regular paper punch cut leadout holes after marking hole positions pattern Now cut four center ribs #8 #9 wing tips t balsa Cut slot mount assembly bellcrank mount Glue inboard center rib #9 engine mount Continued page 120 34 Model Aviation Fuel systems Left top B Heavy-duty pacifier reverse-fill surgical tube bladder standard surgical tube bladder double pen-bladder Right top B Inboard collapsing bag tank made Playtex nurser chicken-hopper tank Uniflow modification Randys 3Yz-oz tank top pressure measuring leak-down pressure various bladders thought combat simple Jig tor building aii versions toregrouno prior assemoiysiioing leading-edge holders rubberband tensioners hold airframe tight against TE jig backstops Removable rib blocks shown place inboard wing removed outboard Trailing edge pattern leadout jig jig fect alignmenthelps prevent unwanted up- dow,-thrust motor mount FAI versions shown THE THIRD ANNUAL iii JANUARY 12 & 13 1980 SEE THE LATEST PRODUCTS AND VISIT WITH MAJOR MANUFACTURERS AND DISTRIBUTORS OF MODEL AIRCRAFT* MODEL ENGINES MODEL BOATS\PeRADIOCONTROLSYSTEMS MODELCARSeMODELINGACCESSORIES INDOOR DEMONSTRATIONS STATIC DISPLAY COMPETITION IN MANY CATEGORIES Rongeu r/Rud ner continued page 34 assembly its inboard side very important position rib parallel axis motor mount insure will no up- downthrust motor mount use small balsa jig fixture aligning parts 5-minute epoxy gluing After assembly dry horizontal grain t center rib filler interlocking plywood bellcrank mount glued mount assembly epoxy point wing built omitting out board ribs #s 5 6 7 8 bladder tube versions outboard rib #8 pacifier ver sions use Hot Stuff microballoons fix two tip ribs outboard rib #9 inboard rib #7 leading trailing edges Ambroid will suffice cementing remaining ribs place Included template 1/16 sheet main ribs met-tru device Carl Goldberg Voodoo kits small tab can included inboard outboard ribs #1 #7 ribs should pre-perforated snap off junction between tab rib after construction allows wing built warp-free flat surface use specially constructed jig building planes eliminates need tabs Building jig allows ease both initial construction repairing also allows detection correction warps can created warp-free structure covering shrinking Fas-Cal essen tial parts jig shown plans next step mounting engine motor mounts location shown plans mm m mm inmm w m i~YtIL OW FEVER A1 I VEOTICE MFEVEfr has won *pqwhld I euca dwlng taut two yeses yyheU Iurns Ibm ALl OTHER RACERS co*hwdfltI o-s sport fiylau FEATUWESIjI Wsts se spin KIt hawinCgtU5 Thmui1 qucId 600 moksg *1W YVW mpor deiw b1W Eu. *1UIA Wins moti hA g Posi N*ininffibbd mets "I YiinuUe uIas~w r Paid o4fMlmu1 DEALER AUDOWTUUT IWVITUOPOstPaid PRODUCTS 681 WelierburnAw,msNrk MD 21146 mm align motor zero thrust remove glow plug use junk prop bolted onto crankshaft Attach heavy thread tip prop string attach clamp-type paper clip can slide along Adjust up- down-thrust engine attempting equalize distance upper lower maximums prop arc tothe trailing edge tip center rib adjusting thrust line up down checking distance string Rotate prop 1800 time checking distance along string paper clip zero up down thrust achieved bolt englne 4/40 machine screws blind mounts Remove englne center section hook up 2-in belicrank leadouts 1/16 music wire pushrod bellcrank mount use 125-pound-test Perfect braided leadout bushed bellcrank brass tubing same control system can reused numerous times pushrod goes outer hole bellcrank arm holes 4 hardwood dowels drilled mount 5/32 drill cemented place epoxy Using Hobbypoxy II glue center section unit against outboard rib #9 tabs leading edge stiffener assure zero angle inci dence upper trailing edge half now glued place use Ambroid joint between center section trailing edge glued 5-minute epoxy point bladder tube pacifier pod inserted using bladder tube cut length Estes BT 55 rocket body tube fit between outboard ribs #9 #5 Use paper punch punch upper lower vent holes large bladder exit hole Cap vertical grain 4 balsa caps Cement bladder tube place ribs #5 #6 and#7thenaddthepartsofoutboard 120 Model Aviation OVERSEAS EXHIBITORS CORDIALLY INVIIED INTERNATIONAL MODELER SHOW eox 127 COSTA MESA CA 92627 17141 548-4700 rib #8 Use 1/16-in scrap filler vent holes provide anchorage Fas-Cal pacifier pod used fashion 1/64 plywood wall a end caps small vent hole bottom outboard corner shown Glue outboard rib #9 glue outboard rib #8 sandwiching place Sheet center section 1 / 16 sheet Make sure glue sheeting center rib unit epoxy have followed instructions whole center rib unit sheeting over glued together epoxy technique have arrived after years crashes rough flying feel fairly massive center section helps damp engine vibration also prevents loosening monoboom-wing junction repeated hard maneuvering crashes wing tips now glued place leadout guides glued sewn inboard tip Construction tall section beglns hinge have shown hinge piece plans four separate plywood parts sandwiching 3/32 o d brass tube can built way desired actually make up 12-in strips brass tubing sandwiched between plywood cut hinge out strip aug saw Epoxy used fabricate hinge After hinge made wire axle brass tubing spacers added bent shape cemented pre-airfoiled stabilator cloth tape epoxied over tubing spacers stabilator leading edge pre-airfoil stabilator drawing ball-point pen midline around perimeter free-hand sanding shape electric drill sander takes about two minutes beats hand sanding stab shape sanding block medium-hard 1-in sq balsamonoboomis cut shape aug saw hinge cemented aligning trailing edge stab perpendicular monoboom drafting triangle Add large nylon control horn finish tall assembly epoxy palnt Rein force monoboom circumferencial loop fiberglass tape just aft wing slot rear binge glued Cover wing carefully Fas-Cal trying lay Fas-Cal surfaces same amount tension initially helps prevent warps due uneven tension F as-Cal after shrunk After wing covered shrunk replace jig remove warp has occurred during covering process holding pressure against warp re-ironing Fas-Cal ajig used gross warps can detected eyeballing along trailing edge finish inside bladder tube filling clear dope pouring out though dope fuel-proof some other finishing products such epoxy paint epoxy palnt can turn small speck sawdust sharp flaw inner surface bladder tube will puncture bladder consistentiy motor mount nacelle filler blocks cemented epoxy mount sanded shape drill sander mask off center section doing prevent slip sander ruining plane use epoxy paint fiberglass cloth finish mount Now excise covering sheeting monoboom will glued perforate sheeting times pin through center rib Epoxy monoboom wing Hobbypoxy Formula IL allow plenty working time get tail aligned wing Sight down trailing edge both wing stab rear align roll axis Use ruler equalize distance between wing trailing edge stabilator trailing edge SoIa FHm EXCLUSIVE LOW-HEAT COVERING FOR FOAM & BALSA FLYING MODELS flexible ble fuel proof lightweight pacIiu Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 COMPLETE THIS FORM AND ATrACH MAILING 1 LABEL FROM RECENT ISSUE K____ LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscriptIon rates $1600 12 months Canada United States pousessionselsewhere $1800 NAME ADDRESS CITY/STATEZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW. WASHINGTON DC 20005 December 1979 121 TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA HAND SELECTED PRECISION SANDED SHEETS KS DOWELS S TRIANGLES KS PLANKS planform alignment Install large nylon control horn Kwik Link wire pushrod guide omit pushrod guide because aerodynamic force stab during outside maneuvers will cause pushrod bowing less effective control outside maneuvers Slow Combat version uses same wing has standard balsa fuselage standard type nose Two pushrod guides required along long fuselage plane should balance motor prop installed 185% chord 1 -in rear leading edge bladder tube placed exactly along line prevent change center gravity fuel runs out center gravity second hole top control horn good starting point Fast Combat version should weigh 8 9 oz engine FAT version 8 8 oz Select slightly lighter wood FAT version Power Fast Slow Rongeurs MK III Fox Combat Special 25% nitro head clearance set 019 Power FAT version favorite high perforniance 151 like Fox 15 Take test flight check warps thrust misalignment usually minimal care taken during construction Rongeur will provide durable cheap easy build easy repair combat plane stable enough fly eyes-off yet tight turning enough competition hundreds others too numerous mention Joes impressive model faithfully duplicates unique features kind aircraft scored 258 static points tops Senior class Past wins include five first places second including first Junior Preci sion Scale 75 77 Nats B-25 scratch-built ves wingspan 25 5/16 inches overall length 21 inches According Joe model weighs pound half two mufflerized Cox 049 Space Hoppers flies 45 feet line flies either engine controlled Stanzel Stunt Master Monoline control unit entire model made balsa solid wings tail rudders hollowed-out fuselage used Aero-Gloss finish entire plane blue-tone white blue nacelle areas Dale adds interesting story relating Joes B-25 5X4 3-bladed props necessary extend flying time miscalculated tank sizes would fly about eight laps 50X016 line 5X3 props So slowed engine down 4-in pitch cut flying line down 45 feet runs about 12 14 laps both engines configuration Inclosing Im thrilled able feature up-close look two young competitors outstanding models because believe characteristic CL Scale modelings greatest strengths continued partici pation Junior Senior age modelers CL Scale degree seen other mode Scale flying Nationals have attended Junior Senior age contestants accounted between 40 50 percent total entries Its refreshing contrast trends noticeable other AMA events Scale Model Research Photos name service recently started Dale Willoughby make quality color photo packs unique fullscale aircraft available scale modelers Dale travels lot whenever possible photographs outstanding home-builts restored antiques interesting airplanes types encoun ters airports fly-ins museums result ing photo packs offers contain numerous views same subject aircraft crucial angies photo list #2 have just received describes packs 57 different aircraft including Wittman Tailwind Flying Flea Lockheed Orion P-26 Peashooter PT-22 Grumman Duck P-38s P-S P-40E on packs vary $550 $1750 per set contain 9 33 top quality color photos prints full 3X5A size 3AX5 means get full prints everything standard 35-mm negatives no spinners chopped off missing wing tips ordinarily free copy latest list send stamped self-addressed long envelope Dale Willoughby Scale Model Research Photos PO Box 675 Orange CA 92666 Now flying season winding down hope youll have time send some photos drawings ideas comments use column need contribution keep space interesting informative Dont forget ModelAviation will pay $5 item printed Mike Gretz Box 162 Montezuma L4 50171 CL Navy Carrier/Perry continued oage 37 slides feeler gage stock has advantage being available thickness desired use stock 0025 0030 depending thickness saw used slide very easily shaped using Dremel tool tungsten-carbide bits cut-off wheels cut-off wheel used router attachment excellent way make initial cut reduce slide approximate width desired Final trimming width should done drawing edge slide along file careful keep sides slide paralleL final polishing 320 grit finer paper should allow slide move freely still provide good seal opening slide should least large exhaust ports cylinder Larger betterwithin limits imposed size exhaust stack amount throttle move ment available need keep exhaust slide out back prop taper opening necessary provide manageable 122 Model Aviation GET ORGANIZED CL Scale/Gretz Hee 5 set 4 sia4y tiles hotds 4 yeas ot youi tavoite 8 t magazines continued page 35 4 MAG FILES $495 Send $496 plan $100 postage handling DOM INDUSTRIES PO BOX 388-K DOVER NH 03820 GEE BEE Z DECALS ALL NUMBERS 2in 1 SCALE & LETTERING EXCEPT THOSE OF THE WINGS GRANGER$4 95 POST WILLIAMS t8t PAWNEESTOSET SAN MARCOS CA F0RNA92069
Edition: Model Aviation - 1979/12
Page Numbers: 32, 33, 34, 120, 121, 122
Designed expressly Fox MK Ill Combat Special Fast Slow Combat Fox 15 orsimilarengine FAI state-ofthe-art design durable cheap easy build repair stable enough fly eyes-off yet tight turning enough competition 0 Chuck Rudner THE introduction Fox MK III Combat Special has done lot help popularity control-line combat since capable 120mph speeds box-stock configuration Due greater weight engine relative previously dominant Supertigre 35s currently available kits two pre viously published built-up balsa designs Buck staff Wilkens both MA obsolete due insufficient wing area allow adequate turn ing capabilities Several years ago tired building more complex planes sheeted leading edges cap strips etc time started develop simple durable cheap combat plane ade quate wing area new Fox MK III allow competitive turning ability drew simpler construction methods Wooten Voodoo utilizing pre-formed Pactra leading edges split-vee 1/16 sheet trailing edges Rather using spars plane makes use pro32 Model Aviation ne avu u-am versions raciyier version requires rearward position 0 leadouts Inboard tip due lack outboard wing weight effect fuel loadwith bladder systems effect present FUILSIZEPLANSAVAILABLE AGE 128 QFAA SE PA EOBeAT SAFE L37ZOKZI BA RH PUPC ENASPC PANE PA ERN PEE FORUFA PACPA CE COAC ERALSA ROSA AURA ERS ON SOASUARSUSES AZ NA JAPSE RU Jo ESTES ER SR HOCEE ILCRSALSA SSPET HIS PATREBA UIR BALSAETCH NAB HPFBSE6S SBBEH COMBAT ICASF FEE EIEU CS CLOTS TURF RON GEUR DESIGNED BY CHUCK RUDNER CROWS RE JOE OFMURCO jTRAIOSS FUSE ERFORCELEE IESALSAAUINE SOrB BALSA CRA FONFLUAF SA AFAAARB BALSA SRAO ORBALSA H REAP iOi~POSIRIOR OF CA UOAFLS AREOE CAg]SEA CO BALSA AS SLOW COMBAT VERSION CASULSA OSASTFO FOR CLAURT F STIFFENERfIR ALA PS S - gressive rib spacing heavy plastic film cover mg FasCal After perfecting design fast combat plane tried sanie wing Slow FAI Combat have quite pleased results FAI version main design used win place 1978 US FAL Combat team three versions have placed local Combat events flexibility strong center section Rongeur combine give durability better seemingly substantial designs leading edge stiffener struc turally tapered trailing edge insure structural break crash will occur inboard outboard center section Thus damaged wing easily replaced stripping remaining lead ing edge center section stiffener midline adding new wing half much easier building whole new plane done properly does add mea surably planes weight fast FAI versions can built either bladder pacifier type pressurized fuel systems Slow Combat version conforms current five-inch nose rule have found Pactra leading edges bluntest shape available pre-formed leading edge consistently straight come variety weights use medium-hard Fast Slow versions medium weight FAI version leading edge too light wing will fold during hard maneuvering Construction Begin cutting iX maple motor mounts shape Also cut -in balsa vertical grain center block cut bellcrank slot yet Use Hobbypoxy Formula II other slow-drying epoxy strength Force epoxy grain center block before gluing C-clamping maple mounts center block Place whole assembly outboard face down flat surface covered plastic food wrap insure true surface engine mounting flanges assembly drying mark out rib spacing leading edge felt-tip marker use ball-point pen pencil balsa can cause desits weaken part Cut leading edge stiffener 3/32 ply Taper ends electric drill sander minimize stress concentration area leading edge Glue leading edge stiffener flat rear surface leading edge lining up center section rib marks drew leading edge Note stiffener -in narrower December 1979 33 MORE SEW VHS PUS UP NPIFFFNFH 7 utnur S oummuing jig wiin S~dF1 iuLr-~n Br tube cutting jig rib blocks removBd covered model fits back jig allOwirrv dBwarpingmild warps often accrue after ironing films such FasCal Note centerSiun parts leading edge stripper foregroundalso plywood template immediate foreground Jig easy repairs rear surface leading edge leave equal 1/16-in space top bottom edge allows center planking fit down flush leading edge Take time evenly aligning stiffener onto leading edge cause center tabs stiffener will later fit between mounts insure zero angle incidence use epoxy also waiting epoxy dry cut trailing edge pieces medium-hard 1/16 sheet Full length 36-in balsa used center section offset slightly toward outboard wing provide longer inboard outboard panel Thus top bottom trailing edges interchangeable once inner bevel created rear trailing edge pre-bevel trailing edges begin plac ing long stralght piece glass steel 36-in steel rule along edge workbench Lay rear edge trailing edge guide Use masking tape cover rearward-most 7/16-in tape should secure balsa glass steel guide rear edges being flush use electric drill sander run length trailing edge sanding between tape glass steel edge have used technique since 1960s find takes minute Pre-beveling increases strength structure gives sharp trailing edge theoretically aerodynamic advantage Mark rib spacing lower trailing edge fine tip-felt pen Cut out main ribs 1/16 sheet balsa Use scrap created cuffing out trailing edges two tip ribs begin root ribs until medium-hard scrap runs out Cut remaining ribs lighter weight 1/16 balsa main ribs basically same shape however trailing edge notches get progres sively wider toward root ribs can cut stack using band saw separately make differential trailing edge notches find easier use 1/16 plywood pattern indi vidually numbered notches hand cut ribs * 11 blade ribs simple shape no spar hole can done fast stacking balsa cut once plywood pattern has leadout hole positions drilled numbered inboard ribs #1 through #7 bladder tube hole cut outboard ribs #6 #7 use regular paper punch cut leadout holes after marking hole positions pattern Now cut four center ribs #8 #9 wing tips t balsa Cut slot mount assembly bellcrank mount Glue inboard center rib #9 engine mount Continued page 120 34 Model Aviation Fuel systems Left top B Heavy-duty pacifier reverse-fill surgical tube bladder standard surgical tube bladder double pen-bladder Right top B Inboard collapsing bag tank made Playtex nurser chicken-hopper tank Uniflow modification Randys 3Yz-oz tank top pressure measuring leak-down pressure various bladders thought combat simple Jig tor building aii versions toregrouno prior assemoiysiioing leading-edge holders rubberband tensioners hold airframe tight against TE jig backstops Removable rib blocks shown place inboard wing removed outboard Trailing edge pattern leadout jig jig fect alignmenthelps prevent unwanted up- dow,-thrust motor mount FAI versions shown THE THIRD ANNUAL iii JANUARY 12 & 13 1980 SEE THE LATEST PRODUCTS AND VISIT WITH MAJOR MANUFACTURERS AND DISTRIBUTORS OF MODEL AIRCRAFT* MODEL ENGINES MODEL BOATS\PeRADIOCONTROLSYSTEMS MODELCARSeMODELINGACCESSORIES INDOOR DEMONSTRATIONS STATIC DISPLAY COMPETITION IN MANY CATEGORIES Rongeu r/Rud ner continued page 34 assembly its inboard side very important position rib parallel axis motor mount insure will no up- downthrust motor mount use small balsa jig fixture aligning parts 5-minute epoxy gluing After assembly dry horizontal grain t center rib filler interlocking plywood bellcrank mount glued mount assembly epoxy point wing built omitting out board ribs #s 5 6 7 8 bladder tube versions outboard rib #8 pacifier ver sions use Hot Stuff microballoons fix two tip ribs outboard rib #9 inboard rib #7 leading trailing edges Ambroid will suffice cementing remaining ribs place Included template 1/16 sheet main ribs met-tru device Carl Goldberg Voodoo kits small tab can included inboard outboard ribs #1 #7 ribs should pre-perforated snap off junction between tab rib after construction allows wing built warp-free flat surface use specially constructed jig building planes eliminates need tabs Building jig allows ease both initial construction repairing also allows detection correction warps can created warp-free structure covering shrinking Fas-Cal essen tial parts jig shown plans next step mounting engine motor mounts location shown plans mm m mm inmm w m i~YtIL OW FEVER A1 I VEOTICE MFEVEfr has won *pqwhld I euca dwlng taut two yeses yyheU Iurns Ibm ALl OTHER RACERS co*hwdfltI o-s sport fiylau FEATUWESIjI Wsts se spin KIt hawinCgtU5 Thmui1 qucId 600 moksg *1W YVW mpor deiw b1W Eu. *1UIA Wins moti hA g Posi N*ininffibbd mets "I YiinuUe uIas~w r Paid o4fMlmu1 DEALER AUDOWTUUT IWVITUOPOstPaid PRODUCTS 681 WelierburnAw,msNrk MD 21146 mm align motor zero thrust remove glow plug use junk prop bolted onto crankshaft Attach heavy thread tip prop string attach clamp-type paper clip can slide along Adjust up- down-thrust engine attempting equalize distance upper lower maximums prop arc tothe trailing edge tip center rib adjusting thrust line up down checking distance string Rotate prop 1800 time checking distance along string paper clip zero up down thrust achieved bolt englne 4/40 machine screws blind mounts Remove englne center section hook up 2-in belicrank leadouts 1/16 music wire pushrod bellcrank mount use 125-pound-test Perfect braided leadout bushed bellcrank brass tubing same control system can reused numerous times pushrod goes outer hole bellcrank arm holes 4 hardwood dowels drilled mount 5/32 drill cemented place epoxy Using Hobbypoxy II glue center section unit against outboard rib #9 tabs leading edge stiffener assure zero angle inci dence upper trailing edge half now glued place use Ambroid joint between center section trailing edge glued 5-minute epoxy point bladder tube pacifier pod inserted using bladder tube cut length Estes BT 55 rocket body tube fit between outboard ribs #9 #5 Use paper punch punch upper lower vent holes large bladder exit hole Cap vertical grain 4 balsa caps Cement bladder tube place ribs #5 #6 and#7thenaddthepartsofoutboard 120 Model Aviation OVERSEAS EXHIBITORS CORDIALLY INVIIED INTERNATIONAL MODELER SHOW eox 127 COSTA MESA CA 92627 17141 548-4700 rib #8 Use 1/16-in scrap filler vent holes provide anchorage Fas-Cal pacifier pod used fashion 1/64 plywood wall a end caps small vent hole bottom outboard corner shown Glue outboard rib #9 glue outboard rib #8 sandwiching place Sheet center section 1 / 16 sheet Make sure glue sheeting center rib unit epoxy have followed instructions whole center rib unit sheeting over glued together epoxy technique have arrived after years crashes rough flying feel fairly massive center section helps damp engine vibration also prevents loosening monoboom-wing junction repeated hard maneuvering crashes wing tips now glued place leadout guides glued sewn inboard tip Construction tall section beglns hinge have shown hinge piece plans four separate plywood parts sandwiching 3/32 o d brass tube can built way desired actually make up 12-in strips brass tubing sandwiched between plywood cut hinge out strip aug saw Epoxy used fabricate hinge After hinge made wire axle brass tubing spacers added bent shape cemented pre-airfoiled stabilator cloth tape epoxied over tubing spacers stabilator leading edge pre-airfoil stabilator drawing ball-point pen midline around perimeter free-hand sanding shape electric drill sander takes about two minutes beats hand sanding stab shape sanding block medium-hard 1-in sq balsamonoboomis cut shape aug saw hinge cemented aligning trailing edge stab perpendicular monoboom drafting triangle Add large nylon control horn finish tall assembly epoxy palnt Rein force monoboom circumferencial loop fiberglass tape just aft wing slot rear binge glued Cover wing carefully Fas-Cal trying lay Fas-Cal surfaces same amount tension initially helps prevent warps due uneven tension F as-Cal after shrunk After wing covered shrunk replace jig remove warp has occurred during covering process holding pressure against warp re-ironing Fas-Cal ajig used gross warps can detected eyeballing along trailing edge finish inside bladder tube filling clear dope pouring out though dope fuel-proof some other finishing products such epoxy paint epoxy palnt can turn small speck sawdust sharp flaw inner surface bladder tube will puncture bladder consistentiy motor mount nacelle filler blocks cemented epoxy mount sanded shape drill sander mask off center section doing prevent slip sander ruining plane use epoxy paint fiberglass cloth finish mount Now excise covering sheeting monoboom will glued perforate sheeting times pin through center rib Epoxy monoboom wing Hobbypoxy Formula IL allow plenty working time get tail aligned wing Sight down trailing edge both wing stab rear align roll axis Use ruler equalize distance between wing trailing edge stabilator trailing edge SoIa FHm EXCLUSIVE LOW-HEAT COVERING FOR FOAM & BALSA FLYING MODELS flexible ble fuel proof lightweight pacIiu Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 COMPLETE THIS FORM AND ATrACH MAILING 1 LABEL FROM RECENT ISSUE K____ LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change 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Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscriptIon rates $1600 12 months Canada United States pousessionselsewhere $1800 NAME ADDRESS CITY/STATEZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW. WASHINGTON DC 20005 December 1979 121 TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA HAND SELECTED PRECISION SANDED SHEETS KS DOWELS S TRIANGLES KS PLANKS planform alignment Install large nylon control horn Kwik Link wire pushrod guide omit pushrod guide because aerodynamic force stab during outside maneuvers will cause pushrod bowing less effective control outside maneuvers Slow Combat version uses same wing has standard balsa fuselage standard type nose Two pushrod guides required along long fuselage plane should balance motor prop installed 185% chord 1 -in rear leading edge bladder tube placed exactly along line prevent change center gravity fuel runs out center gravity second hole top control horn good starting point Fast Combat version should weigh 8 9 oz engine FAT version 8 8 oz Select slightly lighter wood FAT version Power Fast Slow Rongeurs MK III Fox Combat Special 25% nitro head clearance set 019 Power FAT version favorite high perforniance 151 like Fox 15 Take test flight check warps thrust misalignment usually minimal care taken during construction Rongeur will provide durable cheap easy build easy repair combat plane stable enough fly eyes-off yet tight turning enough competition hundreds others too numerous mention Joes impressive model faithfully duplicates unique features kind aircraft scored 258 static points tops Senior class Past wins include five first places second including first Junior Preci sion Scale 75 77 Nats B-25 scratch-built ves wingspan 25 5/16 inches overall length 21 inches According Joe model weighs pound half two mufflerized Cox 049 Space Hoppers flies 45 feet line flies either engine controlled Stanzel Stunt Master Monoline control unit entire model made balsa solid wings tail rudders hollowed-out fuselage used Aero-Gloss finish entire plane blue-tone white blue nacelle areas Dale adds interesting story relating Joes B-25 5X4 3-bladed props necessary extend flying time miscalculated tank sizes would fly about eight laps 50X016 line 5X3 props So slowed engine down 4-in pitch cut flying line down 45 feet runs about 12 14 laps both engines configuration Inclosing Im thrilled able feature up-close look two young competitors outstanding models because believe characteristic CL Scale modelings greatest strengths continued partici pation Junior Senior age modelers CL Scale degree seen other mode Scale flying Nationals have attended Junior Senior age contestants accounted between 40 50 percent total entries Its refreshing contrast trends noticeable other AMA events Scale Model Research Photos name service recently started Dale Willoughby make quality color photo packs unique fullscale aircraft available scale modelers Dale travels lot whenever possible photographs outstanding home-builts restored antiques interesting airplanes types encoun ters airports fly-ins museums result ing photo packs offers contain numerous views same subject aircraft crucial angies photo list #2 have just received describes packs 57 different aircraft including Wittman Tailwind Flying Flea Lockheed Orion P-26 Peashooter PT-22 Grumman Duck P-38s P-S P-40E on packs vary $550 $1750 per set contain 9 33 top quality color photos prints full 3X5A size 3AX5 means get full prints everything standard 35-mm negatives no spinners chopped off missing wing tips ordinarily free copy latest list send stamped self-addressed long envelope Dale Willoughby Scale Model Research Photos PO Box 675 Orange CA 92666 Now flying season winding down hope youll have time send some photos drawings ideas comments use column need contribution keep space interesting informative Dont forget ModelAviation will pay $5 item printed Mike Gretz Box 162 Montezuma L4 50171 CL Navy Carrier/Perry continued oage 37 slides feeler gage stock has advantage being available thickness desired use stock 0025 0030 depending thickness saw used slide very easily shaped using Dremel tool tungsten-carbide bits cut-off wheels cut-off wheel used router attachment excellent way make initial cut reduce slide approximate width desired Final trimming width should done drawing edge slide along file careful keep sides slide paralleL final polishing 320 grit finer paper should allow slide move freely still provide good seal opening slide should least large exhaust ports cylinder Larger betterwithin limits imposed size exhaust stack amount throttle move ment available need keep exhaust slide out back prop taper opening necessary provide manageable 122 Model Aviation GET ORGANIZED CL Scale/Gretz Hee 5 set 4 sia4y tiles hotds 4 yeas ot youi tavoite 8 t magazines continued page 35 4 MAG FILES $495 Send $496 plan $100 postage handling DOM INDUSTRIES PO BOX 388-K DOVER NH 03820 GEE BEE Z DECALS ALL NUMBERS 2in 1 SCALE & LETTERING EXCEPT THOSE OF THE WINGS GRANGER$4 95 POST WILLIAMS t8t PAWNEESTOSET SAN MARCOS CA F0RNA92069