tcIi iheritmi udels altec aircr area about namic Si uld have ecame m re ifier ri rse ood hich I/B PLY 1 SA CRADLESI/4X 5/8 FORM AF SULLIVAN - FOR WING SE1DNDINTO Ck N N 2 F Va 1 34 SP 3/32 iR 1/A SCOOP / 1 1/4 HARD BALSA FIN L EDGE /4X 5/8 BALSA LEDGE AND SPAR 1/16 TOPAND BOTTOM PLANKING 1/16 BALSA RIBS ER 1/4 BALSA TIP CK AND RUDDER am ailerons w Special muffler fw aae too often ignore4axim s nifty proflielmance milned Solution rolling light t -if anyone wants less thrust required factors interrelated object goad de sign use best compromise compromise must What made objectives easy accomplish recent introduction K&B 40 model 9000 engine plus Macs Products special muffler use Normally am design around particular product Solution doing probably ab solutely necessary other engines provide ample power However model 9000 amplifies dvantagCs design engine really does have power normal 60 about half weight considerably smaller size Less engine weight site means less struc tural weight lower drag Lower fuel consumption helps 40 will turn 60size propeller higher rpm normal 60 So what hot about Solution Its structure ~rodynamics dif ferent outstanding thing learn pylon racing build light strong durable airframes Much learned racers has applied design might question use power pod utility obvious fact excellent power vibration absorber 15 also provides neat way enclose ww unit t ovabl pyic necessities needed other t mounts disappear pod effort worthwhile wing heart aircr2ft greater efficiency wing remainder aircraft must cc ute great extent wing cc flying speed because dra duces Drag affected si wing airfoil used very low-drag airfoil used greater control speed tne larger wing lift greater center airfoil NACA 65015 about finest foil avail able use thickness top efficiency range anything thicker would nothing add drag An airfoil progression also used changing 65015 root 65012 tip 65012 stable has less drag wish tips stable course less tip drag center drag moved closer center r craft wish concentrate dr weight close possible cei craft greatest stability Effic would greater higher aspect compromise necessary whe euverabiity required Dihedral desirable oft carded recent designs obt sneaky way Because th taper major portion dib obtained putting di intoi~ttntT wit dihec tail nenoerate Note tne center ot rudder area near thrust line hinge line slanted thrust line Such arrangement removes rolling action rudder applied maneuvers horizontal tail minimum size because good airfoil such tail elevator movement minimized As elevator moved airfoil changes full symmetrical m under Thp Hank Clark wE System parts laid omj ag de oIutIon cannot cowled engine F cowled pressure cowl enging will nc suiding craft Any Intl flow around taken around disturbed no r result nose Witi snapped picture th -wheel gear eliminates w ducing drag intake allowing air enter entire engine air just intakes proper i must created past does happen mounted pocket designs cylinder i very little air move fuselage inclu always pain have less pain necessary distinct asset use airfoils pattern ering scale effect ds above desira does take much m bulate off trailing tion occurs enqi joins fuselage w Combination along fusela d Under extrer nt air can affect solid airflow call fish Drovide tail rce arrangement dete toes its work el force arrai eveiopment bit better arrangement rfoil develop tack mu vity create lht time rero angle great equal will remain g enough erted iange choc wings angle inci& stabilizer has t ate tail lift p udel will tend speed ch lift created determined ositive will create 1p inter c NOW WHAT EVERYONES BEEN WAITING FOR BEELPAE L Please send complete utalog -Enclosed Si 00 refunded NAME first order Add 550 1st clam mail return add $100 handling other ADDRESS sophisticated piece lab quality equipment cycling ni-cd batteries Accurate dependable attractive --Automatic discharging recharging both re ceiver transmitter batteries simultaneously independently --Switch three different transmitter voltages 6V 96V 12V --Switch two different receiver charge rates 20 ma 50 ma --Four digit LED readout no mechanical clock motors --Modern design tight tolerance components sure total accuracy down lOb 1/10 minute --Available kit form assembled tested -I AF mi Efl1 interference can easily get point particularly true shielded wire making connection broken connections dirty have check out possibilities before making decision Ultimately simple solution keep trans mitter antenna collapsed much possible seek out locations alignments antenna pro duce least interference Several people have requested informa tion Art Cervenkas castoring nose wheel Ranger 42 ways get effect shown Fig 3 works need some pieces 3/32 ID brass tubing piece 3/32 OD music wire some 20gauge copper wire solder rubber band Keep letters coming folks makes feel wanted George Myers 70 Froelich Farm Rd Hicksville NY 11801 Solution/deBolt continued page 18 wing considering flat plate drag Drag also increases square speed As speed increases drag wing rises quickly rest craft As far maintaining straight flight over Now Hobbypoxy PFX H85 Polyester Filler compound white can great level ing dips dents wrin kies chips other im perfections fiberglass parts brilliant white polyester resin paste form non-sagging fast setting feathers out zero thickness peeling flaking Fuel-proof can filed drilled sanded Price $275 per pint catalyst Formula 3H53 Thixo tropic Epoxy Glue stays put no sag runs dips vertical surfaces Its controlled viscosity allows applied vertical surfaces thin edges other prob lem areas other glues just run off Price $450 per set two 4-az cans Pettit Paint Co 36 Pine St Borough Rockaway NJ 07866 product review product review product review wide speed range concerned need something compensate shift center drag caused wing accomplished placing line thrust above center resistance Thrust decreases proportionally speed action used counteract wing drag also proportional speed obtain optimum performance aerobatic model need will require least amount con trol quality called pointing neutral stability Once pointed craft stays exactly course until control action changes its heading com pleting maneuver neutralizing con trols turns control flight over aerodynamic controls designed model force arrangementmore pilot abilitycontributes action could continue describe little design details add overall quality Solution Such things wing taper using bit sweepback cer tainly important de tails However will recognize things Pattern design new im portant have proper basics add details Solution does because abnormal attention paid drag re duction unusual amount lift avail able efficient wing light wing loading course ample thrust provided powerpl ant Windy weather performance bound August1978 85 34G15 Ace Digipace assembled $9495 34G16 Ace Digipace kit 7995 BOX SUE HIGGINSVILLE MO product review product review product review FINE QUALITY KITS AND ACCESSORIES p p -7GEE BEE RACER 1/32 NORTHROP GAMMA BOEING 247 1/72 MARTIN B lOB 1/72 CURTISS C-46 1/72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND 50 FOR ILLUSTRATED CATALOG DEPARTMENT MA iai PAWNEE ST SAN MARCOS Ca 92069 question model will have good rough air performance penetrates well does change heading drifts wind flying cross wind Low drag ample thrust provide good pene tration properly located center lat eral area will help maintain headings cross wind Construction Since wanted low wing loading optimum performance no foam fiber glass used Templates provided foam wing foam wing will add least oam CG panel will moved farther out wing loss wing stability fiber glass fuselage could produced nose length would probably have increased balance Wing Structural strength enhanced use stressed skin Practically strength comes outer skin case skin must laminate Although wing has wood covering satisfactory just fill wood resin method cover stretchable plastics fabric needs tightly bonded sheet covering used Silron fabric attached common dope goes easily once place re quires little sanding filling An alter nate -oz fiberglass cloth applied resinmore work bit heavier stressed skin principle much internal structure eliminated adding simplicity landing gear mounts etc used work additional struc ture once performed wing assembly method recent development assures absolutely true wing making assembly simply job sticking parts together dihe dral board must jig set up bottom wing faces up angle board will match dihedral top wing Wing assembly saddle jigs fabricated Using wing plan dimensions locations jigs determined board secured place Sheeting top skin glued up roughly sized Press sheeting saddle jigs using appro priate ribs determines exact out line wing sheeting final sizing can made Assembly commences spar followed ribs form sheeting jigs simply matter sticking various parts place finishing main struc ture planking bottom 3-in sheeting wing tips different No blocks used saving several ounces crit ical area No carving shaping needed wing out jig top sheeting will extend past end ribs cut tip shape shown large flat sanding block bottom trued up accept tip plate done sanding fore aft tip plate will mate neatly end rib bottom edge tip sheeting top tip plate should form smooth surface no sanding required Tail Stressed skin used same jig method can used However might want use other method shown works well small structures centerline method Begin leading trailing edges product review product review product review Douglas World Cruiser discriminating plastic model builder feel aeronau tical history love airplanes well aware Williams Bros line history makers Now added 1/72-scale rendition Douglas World Cruiser small group planes flew around world 1924 elapsed time 175 days De cals allow finishing model five planes group An important plus provision wheels pontoons since planes used both during 27553 mile route $495 Williams Bros 181 Pawnee St San Marcos CA 92069 product review product review product review placed building board width great enough no portion structure will touch board Centerlines scribed ribs well leading trailing edges edges place insert ribs between obtaining alignment centerlines Once fastened add sheeting ready flip over structure add sheeting other side Shaping completes job Fuselage Except nose cowl pod area fuselage typical box faired top change bottom planked top fairing sheeted bottom Planking goes easily other method recent novation coat inside plank ing resin Hobby Poxy No 2 glue adding greatly strength durability foundation pod maple crutch As formidable looks simple machine tools can make cinchand costs pennies Scrounge small piece 5/4 1/s maple school shop lumberyard scrap pile have making two crutches wood easily shaped scroll jig band saw can done drill press Drill zillion holes around outline break away scrap straight sided router bit true outline can ground shape shaped full 5/4 maple crutch can run through table saw presto have two fuselage mount crutch 1/4 plywood simple shaping job locating shear pins hold-down screws first position crutch crutch clamped fuselage mounts use crutch holes drill guide Cowlings often chore en joy carving shaping balsa blocks described method construction avoids usual agony Assemble cowl lay ers engines vary shape crank case up does clearance required Mount engine hook up throttle linkage chop hole piece 1 balsa Slip balsa over cylinder enlarge hole eye until necessary clearances attained Cement first layer fuselage precision fits required next layer covers cylin der fins head Make tY2 diam hole another piece 1 stock slip over cylinder fit cylinder should close clearance carburetor muffler will need provided final layer will simply cap off cylinder head fair whole bottom fuselage As outside can rough shape layers build up otherwise will have big glob balsa attack carving knife sizing outside difficult because can hack off huge chunks during rough shaping important bring final shape down min imum maintaining smoothly flowing curves Covering Finishing have 86 Model Aviation r HOBBYPOXY FORMULA 3 THIXOTROPIC EPOXY GLUE NO SAGS. NO RUNS. NO DRIPS. Formula 3 specially formulated gel-like viscosity allowing applied vertical surfaces thin edges other problem areas other glues just run off makes Formula 3 perfect planking building up reinforcing fillets joints sealing cracks filling holes joining poorly fitted badly die-crushed parts . hundred other things youve always wished kind glue now its made Hobbypoxy leader epoxy glues model building Formula 3 packaged two four-ounce cans has working time hour cures hard overnight mmmxv renews L Division Pettit Paint co Inc 36 Pine Street Rockaway NJ 07866 favorite ways used Silron dope works extremely well requires lit tie effort provides excellent durability Cover forward section fuselage pod -oz fiberglass cloth finishing resin durable 100% fuelproof Cover aft section fu selage tail Silkspan paper dope Finish heavy coat Super Poxy primer followed colored Hobby Poxy desired final step coat clear Hobby Poxy seal everything place wish super finish sanding out clear adding coats will give optimum hope Solution will add flying pleasure know will save money RC Aerobatics/VanPutte continued page 21 Since adopting tailwheel shoe sys tem have lost single empennage due snagged tailwheels tailwheel runs gopher hole rubberband breaks taliwbeel shoe comes free fuse lage plastic clevis pops open plane lands safely ready flown again after assembly new rubberband short time ago received note editor contained following formation have fantastic success Simitar number plan As two months ago Bill Evans sold 3000 wing cores indicates state fusion goes beyond mag azine saw happen once before Model Airplane News sold 8000 Smog Hog plans What makes new information interesting vari ety types Bill derived original design Theres no doubt different looking airplane always draws interest flying field flies well bound lot copies building board shortly afterward Thats what happened Bill Evans Simitar Simitar XV first product review product review product review appeared contruction article De cember 76 issue Model Aviation Na tionwide interest response defi nitely different craft gives indication Simitar design will given credit making flying wing practical reality within grasp RC pilots Bill has designed built no less 30 flying wings Among have both gliders powered airplanes Glid ers Saracen RCM April 1976 72 glider Little Saracen 48 glider Super Saracen 120 glider Power Simitar RCM December 1976 Simitar XV MA December 1976 Simitar XV now has improved upon include motor control steerable tri cycle landing gear epoxy fiberglass fuselage molded-in canopy air takes firewall removable engine cowl Simitar XV K&B 40 have Simitar 540 thats end Bill has now de veloped series Simitar Twins first pictured above powered two Cox Medallion 09s two channel using elevons no engine control After engine quits 31/2-pounder main tains altitude 09 also 049 Twin well 19 Twin now flying 40 Twin soon come What next Well Bill says bot tom line will complete negative stagger twin-engine Simitar Bi Wing Guess well have wait see Next months column will include August1978 87 product review product review product review Seen loledo Four-bladed rigid rotor fully aerobatic helicopter American RC Helicop ters Inc 23811 Via Fabricante Mission Vie jo CA 92675
Edition: Model Aviation - 1978/08
Page Numbers: 13, 14, 15, 16, 17, 18, 85, 86, 87
tcIi iheritmi udels altec aircr area about namic Si uld have ecame m re ifier ri rse ood hich I/B PLY 1 SA CRADLESI/4X 5/8 FORM AF SULLIVAN - FOR WING SE1DNDINTO Ck N N 2 F Va 1 34 SP 3/32 iR 1/A SCOOP / 1 1/4 HARD BALSA FIN L EDGE /4X 5/8 BALSA LEDGE AND SPAR 1/16 TOPAND BOTTOM PLANKING 1/16 BALSA RIBS ER 1/4 BALSA TIP CK AND RUDDER am ailerons w Special muffler fw aae too often ignore4axim s nifty proflielmance milned Solution rolling light t -if anyone wants less thrust required factors interrelated object goad de sign use best compromise compromise must What made objectives easy accomplish recent introduction K&B 40 model 9000 engine plus Macs Products special muffler use Normally am design around particular product Solution doing probably ab solutely necessary other engines provide ample power However model 9000 amplifies dvantagCs design engine really does have power normal 60 about half weight considerably smaller size Less engine weight site means less struc tural weight lower drag Lower fuel consumption helps 40 will turn 60size propeller higher rpm normal 60 So what hot about Solution Its structure ~rodynamics dif ferent outstanding thing learn pylon racing build light strong durable airframes Much learned racers has applied design might question use power pod utility obvious fact excellent power vibration absorber 15 also provides neat way enclose ww unit t ovabl pyic necessities needed other t mounts disappear pod effort worthwhile wing heart aircr2ft greater efficiency wing remainder aircraft must cc ute great extent wing cc flying speed because dra duces Drag affected si wing airfoil used very low-drag airfoil used greater control speed tne larger wing lift greater center airfoil NACA 65015 about finest foil avail able use thickness top efficiency range anything thicker would nothing add drag An airfoil progression also used changing 65015 root 65012 tip 65012 stable has less drag wish tips stable course less tip drag center drag moved closer center r craft wish concentrate dr weight close possible cei craft greatest stability Effic would greater higher aspect compromise necessary whe euverabiity required Dihedral desirable oft carded recent designs obt sneaky way Because th taper major portion dib obtained putting di intoi~ttntT wit dihec tail nenoerate Note tne center ot rudder area near thrust line hinge line slanted thrust line Such arrangement removes rolling action rudder applied maneuvers horizontal tail minimum size because good airfoil such tail elevator movement minimized As elevator moved airfoil changes full symmetrical m under Thp Hank Clark wE System parts laid omj ag de oIutIon cannot cowled engine F cowled pressure cowl enging will nc suiding craft Any Intl flow around taken around disturbed no r result nose Witi snapped picture th -wheel gear eliminates w ducing drag intake allowing air enter entire engine air just intakes proper i must created past does happen mounted pocket designs cylinder i very little air move fuselage inclu always pain have less pain necessary distinct asset use airfoils pattern ering scale effect ds above desira does take much m bulate off trailing tion occurs enqi joins fuselage w Combination along fusela d Under extrer nt air can affect solid airflow call fish Drovide tail rce arrangement dete toes its work el force arrai eveiopment bit better arrangement rfoil develop tack mu vity create lht time rero angle great equal will remain g enough erted iange choc wings angle inci& stabilizer has t ate tail lift p udel will tend speed ch lift created determined ositive will create 1p inter c NOW WHAT EVERYONES BEEN WAITING FOR BEELPAE L Please send complete utalog -Enclosed Si 00 refunded NAME first order Add 550 1st clam mail return add $100 handling other ADDRESS sophisticated piece lab quality equipment cycling ni-cd batteries Accurate dependable attractive --Automatic discharging recharging both re ceiver transmitter batteries simultaneously independently --Switch three different transmitter voltages 6V 96V 12V --Switch two different receiver charge rates 20 ma 50 ma --Four digit LED readout no mechanical clock motors --Modern design tight tolerance components sure total accuracy down lOb 1/10 minute --Available kit form assembled tested -I AF mi Efl1 interference can easily get point particularly true shielded wire making connection broken connections dirty have check out possibilities before making decision Ultimately simple solution keep trans mitter antenna collapsed much possible seek out locations alignments antenna pro duce least interference Several people have requested informa tion Art Cervenkas castoring nose wheel Ranger 42 ways get effect shown Fig 3 works need some pieces 3/32 ID brass tubing piece 3/32 OD music wire some 20gauge copper wire solder rubber band Keep letters coming folks makes feel wanted George Myers 70 Froelich Farm Rd Hicksville NY 11801 Solution/deBolt continued page 18 wing considering flat plate drag Drag also increases square speed As speed increases drag wing rises quickly rest craft As far maintaining straight flight over Now Hobbypoxy PFX H85 Polyester Filler compound white can great level ing dips dents wrin kies chips other im perfections fiberglass parts brilliant white polyester resin paste form non-sagging fast setting feathers out zero thickness peeling flaking Fuel-proof can filed drilled sanded Price $275 per pint catalyst Formula 3H53 Thixo tropic Epoxy Glue stays put no sag runs dips vertical surfaces Its controlled viscosity allows applied vertical surfaces thin edges other prob lem areas other glues just run off Price $450 per set two 4-az cans Pettit Paint Co 36 Pine St Borough Rockaway NJ 07866 product review product review product review wide speed range concerned need something compensate shift center drag caused wing accomplished placing line thrust above center resistance Thrust decreases proportionally speed action used counteract wing drag also proportional speed obtain optimum performance aerobatic model need will require least amount con trol quality called pointing neutral stability Once pointed craft stays exactly course until control action changes its heading com pleting maneuver neutralizing con trols turns control flight over aerodynamic controls designed model force arrangementmore pilot abilitycontributes action could continue describe little design details add overall quality Solution Such things wing taper using bit sweepback cer tainly important de tails However will recognize things Pattern design new im portant have proper basics add details Solution does because abnormal attention paid drag re duction unusual amount lift avail able efficient wing light wing loading course ample thrust provided powerpl ant Windy weather performance bound August1978 85 34G15 Ace Digipace assembled $9495 34G16 Ace Digipace kit 7995 BOX SUE HIGGINSVILLE MO product review product review product review FINE QUALITY KITS AND ACCESSORIES p p -7GEE BEE RACER 1/32 NORTHROP GAMMA BOEING 247 1/72 MARTIN B lOB 1/72 CURTISS C-46 1/72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND 50 FOR ILLUSTRATED CATALOG DEPARTMENT MA iai PAWNEE ST SAN MARCOS Ca 92069 question model will have good rough air performance penetrates well does change heading drifts wind flying cross wind Low drag ample thrust provide good pene tration properly located center lat eral area will help maintain headings cross wind Construction Since wanted low wing loading optimum performance no foam fiber glass used Templates provided foam wing foam wing will add least oam CG panel will moved farther out wing loss wing stability fiber glass fuselage could produced nose length would probably have increased balance Wing Structural strength enhanced use stressed skin Practically strength comes outer skin case skin must laminate Although wing has wood covering satisfactory just fill wood resin method cover stretchable plastics fabric needs tightly bonded sheet covering used Silron fabric attached common dope goes easily once place re quires little sanding filling An alter nate -oz fiberglass cloth applied resinmore work bit heavier stressed skin principle much internal structure eliminated adding simplicity landing gear mounts etc used work additional struc ture once performed wing assembly method recent development assures absolutely true wing making assembly simply job sticking parts together dihe dral board must jig set up bottom wing faces up angle board will match dihedral top wing Wing assembly saddle jigs fabricated Using wing plan dimensions locations jigs determined board secured place Sheeting top skin glued up roughly sized Press sheeting saddle jigs using appro priate ribs determines exact out line wing sheeting final sizing can made Assembly commences spar followed ribs form sheeting jigs simply matter sticking various parts place finishing main struc ture planking bottom 3-in sheeting wing tips different No blocks used saving several ounces crit ical area No carving shaping needed wing out jig top sheeting will extend past end ribs cut tip shape shown large flat sanding block bottom trued up accept tip plate done sanding fore aft tip plate will mate neatly end rib bottom edge tip sheeting top tip plate should form smooth surface no sanding required Tail Stressed skin used same jig method can used However might want use other method shown works well small structures centerline method Begin leading trailing edges product review product review product review Douglas World Cruiser discriminating plastic model builder feel aeronau tical history love airplanes well aware Williams Bros line history makers Now added 1/72-scale rendition Douglas World Cruiser small group planes flew around world 1924 elapsed time 175 days De cals allow finishing model five planes group An important plus provision wheels pontoons since planes used both during 27553 mile route $495 Williams Bros 181 Pawnee St San Marcos CA 92069 product review product review product review placed building board width great enough no portion structure will touch board Centerlines scribed ribs well leading trailing edges edges place insert ribs between obtaining alignment centerlines Once fastened add sheeting ready flip over structure add sheeting other side Shaping completes job Fuselage Except nose cowl pod area fuselage typical box faired top change bottom planked top fairing sheeted bottom Planking goes easily other method recent novation coat inside plank ing resin Hobby Poxy No 2 glue adding greatly strength durability foundation pod maple crutch As formidable looks simple machine tools can make cinchand costs pennies Scrounge small piece 5/4 1/s maple school shop lumberyard scrap pile have making two crutches wood easily shaped scroll jig band saw can done drill press Drill zillion holes around outline break away scrap straight sided router bit true outline can ground shape shaped full 5/4 maple crutch can run through table saw presto have two fuselage mount crutch 1/4 plywood simple shaping job locating shear pins hold-down screws first position crutch crutch clamped fuselage mounts use crutch holes drill guide Cowlings often chore en joy carving shaping balsa blocks described method construction avoids usual agony Assemble cowl lay ers engines vary shape crank case up does clearance required Mount engine hook up throttle linkage chop hole piece 1 balsa Slip balsa over cylinder enlarge hole eye until necessary clearances attained Cement first layer fuselage precision fits required next layer covers cylin der fins head Make tY2 diam hole another piece 1 stock slip over cylinder fit cylinder should close clearance carburetor muffler will need provided final layer will simply cap off cylinder head fair whole bottom fuselage As outside can rough shape layers build up otherwise will have big glob balsa attack carving knife sizing outside difficult because can hack off huge chunks during rough shaping important bring final shape down min imum maintaining smoothly flowing curves Covering Finishing have 86 Model Aviation r HOBBYPOXY FORMULA 3 THIXOTROPIC EPOXY GLUE NO SAGS. NO RUNS. NO DRIPS. Formula 3 specially formulated gel-like viscosity allowing applied vertical surfaces thin edges other problem areas other glues just run off makes Formula 3 perfect planking building up reinforcing fillets joints sealing cracks filling holes joining poorly fitted badly die-crushed parts . hundred other things youve always wished kind glue now its made Hobbypoxy leader epoxy glues model building Formula 3 packaged two four-ounce cans has working time hour cures hard overnight mmmxv renews L Division Pettit Paint co Inc 36 Pine Street Rockaway NJ 07866 favorite ways used Silron dope works extremely well requires lit tie effort provides excellent durability Cover forward section fuselage pod -oz fiberglass cloth finishing resin durable 100% fuelproof Cover aft section fu selage tail Silkspan paper dope Finish heavy coat Super Poxy primer followed colored Hobby Poxy desired final step coat clear Hobby Poxy seal everything place wish super finish sanding out clear adding coats will give optimum hope Solution will add flying pleasure know will save money RC Aerobatics/VanPutte continued page 21 Since adopting tailwheel shoe sys tem have lost single empennage due snagged tailwheels tailwheel runs gopher hole rubberband breaks taliwbeel shoe comes free fuse lage plastic clevis pops open plane lands safely ready flown again after assembly new rubberband short time ago received note editor contained following formation have fantastic success Simitar number plan As two months ago Bill Evans sold 3000 wing cores indicates state fusion goes beyond mag azine saw happen once before Model Airplane News sold 8000 Smog Hog plans What makes new information interesting vari ety types Bill derived original design Theres no doubt different looking airplane always draws interest flying field flies well bound lot copies building board shortly afterward Thats what happened Bill Evans Simitar Simitar XV first product review product review product review appeared contruction article De cember 76 issue Model Aviation Na tionwide interest response defi nitely different craft gives indication Simitar design will given credit making flying wing practical reality within grasp RC pilots Bill has designed built no less 30 flying wings Among have both gliders powered airplanes Glid ers Saracen RCM April 1976 72 glider Little Saracen 48 glider Super Saracen 120 glider Power Simitar RCM December 1976 Simitar XV MA December 1976 Simitar XV now has improved upon include motor control steerable tri cycle landing gear epoxy fiberglass fuselage molded-in canopy air takes firewall removable engine cowl Simitar XV K&B 40 have Simitar 540 thats end Bill has now de veloped series Simitar Twins first pictured above powered two Cox Medallion 09s two channel using elevons no engine control After engine quits 31/2-pounder main tains altitude 09 also 049 Twin well 19 Twin now flying 40 Twin soon come What next Well Bill says bot tom line will complete negative stagger twin-engine Simitar Bi Wing Guess well have wait see Next months column will include August1978 87 product review product review product review Seen loledo Four-bladed rigid rotor fully aerobatic helicopter American RC Helicop ters Inc 23811 Via Fabricante Mission Vie jo CA 92675
Edition: Model Aviation - 1978/08
Page Numbers: 13, 14, 15, 16, 17, 18, 85, 86, 87
tcIi iheritmi udels altec aircr area about namic Si uld have ecame m re ifier ri rse ood hich I/B PLY 1 SA CRADLESI/4X 5/8 FORM AF SULLIVAN - FOR WING SE1DNDINTO Ck N N 2 F Va 1 34 SP 3/32 iR 1/A SCOOP / 1 1/4 HARD BALSA FIN L EDGE /4X 5/8 BALSA LEDGE AND SPAR 1/16 TOPAND BOTTOM PLANKING 1/16 BALSA RIBS ER 1/4 BALSA TIP CK AND RUDDER am ailerons w Special muffler fw aae too often ignore4axim s nifty proflielmance milned Solution rolling light t -if anyone wants less thrust required factors interrelated object goad de sign use best compromise compromise must What made objectives easy accomplish recent introduction K&B 40 model 9000 engine plus Macs Products special muffler use Normally am design around particular product Solution doing probably ab solutely necessary other engines provide ample power However model 9000 amplifies dvantagCs design engine really does have power normal 60 about half weight considerably smaller size Less engine weight site means less struc tural weight lower drag Lower fuel consumption helps 40 will turn 60size propeller higher rpm normal 60 So what hot about Solution Its structure ~rodynamics dif ferent outstanding thing learn pylon racing build light strong durable airframes Much learned racers has applied design might question use power pod utility obvious fact excellent power vibration absorber 15 also provides neat way enclose ww unit t ovabl pyic necessities needed other t mounts disappear pod effort worthwhile wing heart aircr2ft greater efficiency wing remainder aircraft must cc ute great extent wing cc flying speed because dra duces Drag affected si wing airfoil used very low-drag airfoil used greater control speed tne larger wing lift greater center airfoil NACA 65015 about finest foil avail able use thickness top efficiency range anything thicker would nothing add drag An airfoil progression also used changing 65015 root 65012 tip 65012 stable has less drag wish tips stable course less tip drag center drag moved closer center r craft wish concentrate dr weight close possible cei craft greatest stability Effic would greater higher aspect compromise necessary whe euverabiity required Dihedral desirable oft carded recent designs obt sneaky way Because th taper major portion dib obtained putting di intoi~ttntT wit dihec tail nenoerate Note tne center ot rudder area near thrust line hinge line slanted thrust line Such arrangement removes rolling action rudder applied maneuvers horizontal tail minimum size because good airfoil such tail elevator movement minimized As elevator moved airfoil changes full symmetrical m under Thp Hank Clark wE System parts laid omj ag de oIutIon cannot cowled engine F cowled pressure cowl enging will nc suiding craft Any Intl flow around taken around disturbed no r result nose Witi snapped picture th -wheel gear eliminates w ducing drag intake allowing air enter entire engine air just intakes proper i must created past does happen mounted pocket designs cylinder i very little air move fuselage inclu always pain have less pain necessary distinct asset use airfoils pattern ering scale effect ds above desira does take much m bulate off trailing tion occurs enqi joins fuselage w Combination along fusela d Under extrer nt air can affect solid airflow call fish Drovide tail rce arrangement dete toes its work el force arrai eveiopment bit better arrangement rfoil develop tack mu vity create lht time rero angle great equal will remain g enough erted iange choc wings angle inci& stabilizer has t ate tail lift p udel will tend speed ch lift created determined ositive will create 1p inter c NOW WHAT EVERYONES BEEN WAITING FOR BEELPAE L Please send complete utalog -Enclosed Si 00 refunded NAME first order Add 550 1st clam mail return add $100 handling other ADDRESS sophisticated piece lab quality equipment cycling ni-cd batteries Accurate dependable attractive --Automatic discharging recharging both re ceiver transmitter batteries simultaneously independently --Switch three different transmitter voltages 6V 96V 12V --Switch two different receiver charge rates 20 ma 50 ma --Four digit LED readout no mechanical clock motors --Modern design tight tolerance components sure total accuracy down lOb 1/10 minute --Available kit form assembled tested -I AF mi Efl1 interference can easily get point particularly true shielded wire making connection broken connections dirty have check out possibilities before making decision Ultimately simple solution keep trans mitter antenna collapsed much possible seek out locations alignments antenna pro duce least interference Several people have requested informa tion Art Cervenkas castoring nose wheel Ranger 42 ways get effect shown Fig 3 works need some pieces 3/32 ID brass tubing piece 3/32 OD music wire some 20gauge copper wire solder rubber band Keep letters coming folks makes feel wanted George Myers 70 Froelich Farm Rd Hicksville NY 11801 Solution/deBolt continued page 18 wing considering flat plate drag Drag also increases square speed As speed increases drag wing rises quickly rest craft As far maintaining straight flight over Now Hobbypoxy PFX H85 Polyester Filler compound white can great level ing dips dents wrin kies chips other im perfections fiberglass parts brilliant white polyester resin paste form non-sagging fast setting feathers out zero thickness peeling flaking Fuel-proof can filed drilled sanded Price $275 per pint catalyst Formula 3H53 Thixo tropic Epoxy Glue stays put no sag runs dips vertical surfaces Its controlled viscosity allows applied vertical surfaces thin edges other prob lem areas other glues just run off Price $450 per set two 4-az cans Pettit Paint Co 36 Pine St Borough Rockaway NJ 07866 product review product review product review wide speed range concerned need something compensate shift center drag caused wing accomplished placing line thrust above center resistance Thrust decreases proportionally speed action used counteract wing drag also proportional speed obtain optimum performance aerobatic model need will require least amount con trol quality called pointing neutral stability Once pointed craft stays exactly course until control action changes its heading com pleting maneuver neutralizing con trols turns control flight over aerodynamic controls designed model force arrangementmore pilot abilitycontributes action could continue describe little design details add overall quality Solution Such things wing taper using bit sweepback cer tainly important de tails However will recognize things Pattern design new im portant have proper basics add details Solution does because abnormal attention paid drag re duction unusual amount lift avail able efficient wing light wing loading course ample thrust provided powerpl ant Windy weather performance bound August1978 85 34G15 Ace Digipace assembled $9495 34G16 Ace Digipace kit 7995 BOX SUE HIGGINSVILLE MO product review product review product review FINE QUALITY KITS AND ACCESSORIES p p -7GEE BEE RACER 1/32 NORTHROP GAMMA BOEING 247 1/72 MARTIN B lOB 1/72 CURTISS C-46 1/72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND 50 FOR ILLUSTRATED CATALOG DEPARTMENT MA iai PAWNEE ST SAN MARCOS Ca 92069 question model will have good rough air performance penetrates well does change heading drifts wind flying cross wind Low drag ample thrust provide good pene tration properly located center lat eral area will help maintain headings cross wind Construction Since wanted low wing loading optimum performance no foam fiber glass used Templates provided foam wing foam wing will add least oam CG panel will moved farther out wing loss wing stability fiber glass fuselage could produced nose length would probably have increased balance Wing Structural strength enhanced use stressed skin Practically strength comes outer skin case skin must laminate Although wing has wood covering satisfactory just fill wood resin method cover stretchable plastics fabric needs tightly bonded sheet covering used Silron fabric attached common dope goes easily once place re quires little sanding filling An alter nate -oz fiberglass cloth applied resinmore work bit heavier stressed skin principle much internal structure eliminated adding simplicity landing gear mounts etc used work additional struc ture once performed wing assembly method recent development assures absolutely true wing making assembly simply job sticking parts together dihe dral board must jig set up bottom wing faces up angle board will match dihedral top wing Wing assembly saddle jigs fabricated Using wing plan dimensions locations jigs determined board secured place Sheeting top skin glued up roughly sized Press sheeting saddle jigs using appro priate ribs determines exact out line wing sheeting final sizing can made Assembly commences spar followed ribs form sheeting jigs simply matter sticking various parts place finishing main struc ture planking bottom 3-in sheeting wing tips different No blocks used saving several ounces crit ical area No carving shaping needed wing out jig top sheeting will extend past end ribs cut tip shape shown large flat sanding block bottom trued up accept tip plate done sanding fore aft tip plate will mate neatly end rib bottom edge tip sheeting top tip plate should form smooth surface no sanding required Tail Stressed skin used same jig method can used However might want use other method shown works well small structures centerline method Begin leading trailing edges product review product review product review Douglas World Cruiser discriminating plastic model builder feel aeronau tical history love airplanes well aware Williams Bros line history makers Now added 1/72-scale rendition Douglas World Cruiser small group planes flew around world 1924 elapsed time 175 days De cals allow finishing model five planes group An important plus provision wheels pontoons since planes used both during 27553 mile route $495 Williams Bros 181 Pawnee St San Marcos CA 92069 product review product review product review placed building board width great enough no portion structure will touch board Centerlines scribed ribs well leading trailing edges edges place insert ribs between obtaining alignment centerlines Once fastened add sheeting ready flip over structure add sheeting other side Shaping completes job Fuselage Except nose cowl pod area fuselage typical box faired top change bottom planked top fairing sheeted bottom Planking goes easily other method recent novation coat inside plank ing resin Hobby Poxy No 2 glue adding greatly strength durability foundation pod maple crutch As formidable looks simple machine tools can make cinchand costs pennies Scrounge small piece 5/4 1/s maple school shop lumberyard scrap pile have making two crutches wood easily shaped scroll jig band saw can done drill press Drill zillion holes around outline break away scrap straight sided router bit true outline can ground shape shaped full 5/4 maple crutch can run through table saw presto have two fuselage mount crutch 1/4 plywood simple shaping job locating shear pins hold-down screws first position crutch crutch clamped fuselage mounts use crutch holes drill guide Cowlings often chore en joy carving shaping balsa blocks described method construction avoids usual agony Assemble cowl lay ers engines vary shape crank case up does clearance required Mount engine hook up throttle linkage chop hole piece 1 balsa Slip balsa over cylinder enlarge hole eye until necessary clearances attained Cement first layer fuselage precision fits required next layer covers cylin der fins head Make tY2 diam hole another piece 1 stock slip over cylinder fit cylinder should close clearance carburetor muffler will need provided final layer will simply cap off cylinder head fair whole bottom fuselage As outside can rough shape layers build up otherwise will have big glob balsa attack carving knife sizing outside difficult because can hack off huge chunks during rough shaping important bring final shape down min imum maintaining smoothly flowing curves Covering Finishing have 86 Model Aviation r HOBBYPOXY FORMULA 3 THIXOTROPIC EPOXY GLUE NO SAGS. NO RUNS. NO DRIPS. Formula 3 specially formulated gel-like viscosity allowing applied vertical surfaces thin edges other problem areas other glues just run off makes Formula 3 perfect planking building up reinforcing fillets joints sealing cracks filling holes joining poorly fitted badly die-crushed parts . hundred other things youve always wished kind glue now its made Hobbypoxy leader epoxy glues model building Formula 3 packaged two four-ounce cans has working time hour cures hard overnight mmmxv renews L Division Pettit Paint co Inc 36 Pine Street Rockaway NJ 07866 favorite ways used Silron dope works extremely well requires lit tie effort provides excellent durability Cover forward section fuselage pod -oz fiberglass cloth finishing resin durable 100% fuelproof Cover aft section fu selage tail Silkspan paper dope Finish heavy coat Super Poxy primer followed colored Hobby Poxy desired final step coat clear Hobby Poxy seal everything place wish super finish sanding out clear adding coats will give optimum hope Solution will add flying pleasure know will save money RC Aerobatics/VanPutte continued page 21 Since adopting tailwheel shoe sys tem have lost single empennage due snagged tailwheels tailwheel runs gopher hole rubberband breaks taliwbeel shoe comes free fuse lage plastic clevis pops open plane lands safely ready flown again after assembly new rubberband short time ago received note editor contained following formation have fantastic success Simitar number plan As two months ago Bill Evans sold 3000 wing cores indicates state fusion goes beyond mag azine saw happen once before Model Airplane News sold 8000 Smog Hog plans What makes new information interesting vari ety types Bill derived original design Theres no doubt different looking airplane always draws interest flying field flies well bound lot copies building board shortly afterward Thats what happened Bill Evans Simitar Simitar XV first product review product review product review appeared contruction article De cember 76 issue Model Aviation Na tionwide interest response defi nitely different craft gives indication Simitar design will given credit making flying wing practical reality within grasp RC pilots Bill has designed built no less 30 flying wings Among have both gliders powered airplanes Glid ers Saracen RCM April 1976 72 glider Little Saracen 48 glider Super Saracen 120 glider Power Simitar RCM December 1976 Simitar XV MA December 1976 Simitar XV now has improved upon include motor control steerable tri cycle landing gear epoxy fiberglass fuselage molded-in canopy air takes firewall removable engine cowl Simitar XV K&B 40 have Simitar 540 thats end Bill has now de veloped series Simitar Twins first pictured above powered two Cox Medallion 09s two channel using elevons no engine control After engine quits 31/2-pounder main tains altitude 09 also 049 Twin well 19 Twin now flying 40 Twin soon come What next Well Bill says bot tom line will complete negative stagger twin-engine Simitar Bi Wing Guess well have wait see Next months column will include August1978 87 product review product review product review Seen loledo Four-bladed rigid rotor fully aerobatic helicopter American RC Helicop ters Inc 23811 Via Fabricante Mission Vie jo CA 92675
Edition: Model Aviation - 1978/08
Page Numbers: 13, 14, 15, 16, 17, 18, 85, 86, 87
tcIi iheritmi udels altec aircr area about namic Si uld have ecame m re ifier ri rse ood hich I/B PLY 1 SA CRADLESI/4X 5/8 FORM AF SULLIVAN - FOR WING SE1DNDINTO Ck N N 2 F Va 1 34 SP 3/32 iR 1/A SCOOP / 1 1/4 HARD BALSA FIN L EDGE /4X 5/8 BALSA LEDGE AND SPAR 1/16 TOPAND BOTTOM PLANKING 1/16 BALSA RIBS ER 1/4 BALSA TIP CK AND RUDDER am ailerons w Special muffler fw aae too often ignore4axim s nifty proflielmance milned Solution rolling light t -if anyone wants less thrust required factors interrelated object goad de sign use best compromise compromise must What made objectives easy accomplish recent introduction K&B 40 model 9000 engine plus Macs Products special muffler use Normally am design around particular product Solution doing probably ab solutely necessary other engines provide ample power However model 9000 amplifies dvantagCs design engine really does have power normal 60 about half weight considerably smaller size Less engine weight site means less struc tural weight lower drag Lower fuel consumption helps 40 will turn 60size propeller higher rpm normal 60 So what hot about Solution Its structure ~rodynamics dif ferent outstanding thing learn pylon racing build light strong durable airframes Much learned racers has applied design might question use power pod utility obvious fact excellent power vibration absorber 15 also provides neat way enclose ww unit t ovabl pyic necessities needed other t mounts disappear pod effort worthwhile wing heart aircr2ft greater efficiency wing remainder aircraft must cc ute great extent wing cc flying speed because dra duces Drag affected si wing airfoil used very low-drag airfoil used greater control speed tne larger wing lift greater center airfoil NACA 65015 about finest foil avail able use thickness top efficiency range anything thicker would nothing add drag An airfoil progression also used changing 65015 root 65012 tip 65012 stable has less drag wish tips stable course less tip drag center drag moved closer center r craft wish concentrate dr weight close possible cei craft greatest stability Effic would greater higher aspect compromise necessary whe euverabiity required Dihedral desirable oft carded recent designs obt sneaky way Because th taper major portion dib obtained putting di intoi~ttntT wit dihec tail nenoerate Note tne center ot rudder area near thrust line hinge line slanted thrust line Such arrangement removes rolling action rudder applied maneuvers horizontal tail minimum size because good airfoil such tail elevator movement minimized As elevator moved airfoil changes full symmetrical m under Thp Hank Clark wE System parts laid omj ag de oIutIon cannot cowled engine F cowled pressure cowl enging will nc suiding craft Any Intl flow around taken around disturbed no r result nose Witi snapped picture th -wheel gear eliminates w ducing drag intake allowing air enter entire engine air just intakes proper i must created past does happen mounted pocket designs cylinder i very little air move fuselage inclu always pain have less pain necessary distinct asset use airfoils pattern ering scale effect ds above desira does take much m bulate off trailing tion occurs enqi joins fuselage w Combination along fusela d Under extrer nt air can affect solid airflow call fish Drovide tail rce arrangement dete toes its work el force arrai eveiopment bit better arrangement rfoil develop tack mu vity create lht time rero angle great equal will remain g enough erted iange choc wings angle inci& stabilizer has t ate tail lift p udel will tend speed ch lift created determined ositive will create 1p inter c NOW WHAT EVERYONES BEEN WAITING FOR BEELPAE L Please send complete utalog -Enclosed Si 00 refunded NAME first order Add 550 1st clam mail return add $100 handling other ADDRESS sophisticated piece lab quality equipment cycling ni-cd batteries Accurate dependable attractive --Automatic discharging recharging both re ceiver transmitter batteries simultaneously independently --Switch three different transmitter voltages 6V 96V 12V --Switch two different receiver charge rates 20 ma 50 ma --Four digit LED readout no mechanical clock motors --Modern design tight tolerance components sure total accuracy down lOb 1/10 minute --Available kit form assembled tested -I AF mi Efl1 interference can easily get point particularly true shielded wire making connection broken connections dirty have check out possibilities before making decision Ultimately simple solution keep trans mitter antenna collapsed much possible seek out locations alignments antenna pro duce least interference Several people have requested informa tion Art Cervenkas castoring nose wheel Ranger 42 ways get effect shown Fig 3 works need some pieces 3/32 ID brass tubing piece 3/32 OD music wire some 20gauge copper wire solder rubber band Keep letters coming folks makes feel wanted George Myers 70 Froelich Farm Rd Hicksville NY 11801 Solution/deBolt continued page 18 wing considering flat plate drag Drag also increases square speed As speed increases drag wing rises quickly rest craft As far maintaining straight flight over Now Hobbypoxy PFX H85 Polyester Filler compound white can great level ing dips dents wrin kies chips other im perfections fiberglass parts brilliant white polyester resin paste form non-sagging fast setting feathers out zero thickness peeling flaking Fuel-proof can filed drilled sanded Price $275 per pint catalyst Formula 3H53 Thixo tropic Epoxy Glue stays put no sag runs dips vertical surfaces Its controlled viscosity allows applied vertical surfaces thin edges other prob lem areas other glues just run off Price $450 per set two 4-az cans Pettit Paint Co 36 Pine St Borough Rockaway NJ 07866 product review product review product review wide speed range concerned need something compensate shift center drag caused wing accomplished placing line thrust above center resistance Thrust decreases proportionally speed action used counteract wing drag also proportional speed obtain optimum performance aerobatic model need will require least amount con trol quality called pointing neutral stability Once pointed craft stays exactly course until control action changes its heading com pleting maneuver neutralizing con trols turns control flight over aerodynamic controls designed model force arrangementmore pilot abilitycontributes action could continue describe little design details add overall quality Solution Such things wing taper using bit sweepback cer tainly important de tails However will recognize things Pattern design new im portant have proper basics add details Solution does because abnormal attention paid drag re duction unusual amount lift avail able efficient wing light wing loading course ample thrust provided powerpl ant Windy weather performance bound August1978 85 34G15 Ace Digipace assembled $9495 34G16 Ace Digipace kit 7995 BOX SUE HIGGINSVILLE MO product review product review product review FINE QUALITY KITS AND ACCESSORIES p p -7GEE BEE RACER 1/32 NORTHROP GAMMA BOEING 247 1/72 MARTIN B lOB 1/72 CURTISS C-46 1/72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND 50 FOR ILLUSTRATED CATALOG DEPARTMENT MA iai PAWNEE ST SAN MARCOS Ca 92069 question model will have good rough air performance penetrates well does change heading drifts wind flying cross wind Low drag ample thrust provide good pene tration properly located center lat eral area will help maintain headings cross wind Construction Since wanted low wing loading optimum performance no foam fiber glass used Templates provided foam wing foam wing will add least oam CG panel will moved farther out wing loss wing stability fiber glass fuselage could produced nose length would probably have increased balance Wing Structural strength enhanced use stressed skin Practically strength comes outer skin case skin must laminate Although wing has wood covering satisfactory just fill wood resin method cover stretchable plastics fabric needs tightly bonded sheet covering used Silron fabric attached common dope goes easily once place re quires little sanding filling An alter nate -oz fiberglass cloth applied resinmore work bit heavier stressed skin principle much internal structure eliminated adding simplicity landing gear mounts etc used work additional struc ture once performed wing assembly method recent development assures absolutely true wing making assembly simply job sticking parts together dihe dral board must jig set up bottom wing faces up angle board will match dihedral top wing Wing assembly saddle jigs fabricated Using wing plan dimensions locations jigs determined board secured place Sheeting top skin glued up roughly sized Press sheeting saddle jigs using appro priate ribs determines exact out line wing sheeting final sizing can made Assembly commences spar followed ribs form sheeting jigs simply matter sticking various parts place finishing main struc ture planking bottom 3-in sheeting wing tips different No blocks used saving several ounces crit ical area No carving shaping needed wing out jig top sheeting will extend past end ribs cut tip shape shown large flat sanding block bottom trued up accept tip plate done sanding fore aft tip plate will mate neatly end rib bottom edge tip sheeting top tip plate should form smooth surface no sanding required Tail Stressed skin used same jig method can used However might want use other method shown works well small structures centerline method Begin leading trailing edges product review product review product review Douglas World Cruiser discriminating plastic model builder feel aeronau tical history love airplanes well aware Williams Bros line history makers Now added 1/72-scale rendition Douglas World Cruiser small group planes flew around world 1924 elapsed time 175 days De cals allow finishing model five planes group An important plus provision wheels pontoons since planes used both during 27553 mile route $495 Williams Bros 181 Pawnee St San Marcos CA 92069 product review product review product review placed building board width great enough no portion structure will touch board Centerlines scribed ribs well leading trailing edges edges place insert ribs between obtaining alignment centerlines Once fastened add sheeting ready flip over structure add sheeting other side Shaping completes job Fuselage Except nose cowl pod area fuselage typical box faired top change bottom planked top fairing sheeted bottom Planking goes easily other method recent novation coat inside plank ing resin Hobby Poxy No 2 glue adding greatly strength durability foundation pod maple crutch As formidable looks simple machine tools can make cinchand costs pennies Scrounge small piece 5/4 1/s maple school shop lumberyard scrap pile have making two crutches wood easily shaped scroll jig band saw can done drill press Drill zillion holes around outline break away scrap straight sided router bit true outline can ground shape shaped full 5/4 maple crutch can run through table saw presto have two fuselage mount crutch 1/4 plywood simple shaping job locating shear pins hold-down screws first position crutch crutch clamped fuselage mounts use crutch holes drill guide Cowlings often chore en joy carving shaping balsa blocks described method construction avoids usual agony Assemble cowl lay ers engines vary shape crank case up does clearance required Mount engine hook up throttle linkage chop hole piece 1 balsa Slip balsa over cylinder enlarge hole eye until necessary clearances attained Cement first layer fuselage precision fits required next layer covers cylin der fins head Make tY2 diam hole another piece 1 stock slip over cylinder fit cylinder should close clearance carburetor muffler will need provided final layer will simply cap off cylinder head fair whole bottom fuselage As outside can rough shape layers build up otherwise will have big glob balsa attack carving knife sizing outside difficult because can hack off huge chunks during rough shaping important bring final shape down min imum maintaining smoothly flowing curves Covering Finishing have 86 Model Aviation r HOBBYPOXY FORMULA 3 THIXOTROPIC EPOXY GLUE NO SAGS. NO RUNS. NO DRIPS. Formula 3 specially formulated gel-like viscosity allowing applied vertical surfaces thin edges other problem areas other glues just run off makes Formula 3 perfect planking building up reinforcing fillets joints sealing cracks filling holes joining poorly fitted badly die-crushed parts . hundred other things youve always wished kind glue now its made Hobbypoxy leader epoxy glues model building Formula 3 packaged two four-ounce cans has working time hour cures hard overnight mmmxv renews L Division Pettit Paint co Inc 36 Pine Street Rockaway NJ 07866 favorite ways used Silron dope works extremely well requires lit tie effort provides excellent durability Cover forward section fuselage pod -oz fiberglass cloth finishing resin durable 100% fuelproof Cover aft section fu selage tail Silkspan paper dope Finish heavy coat Super Poxy primer followed colored Hobby Poxy desired final step coat clear Hobby Poxy seal everything place wish super finish sanding out clear adding coats will give optimum hope Solution will add flying pleasure know will save money RC Aerobatics/VanPutte continued page 21 Since adopting tailwheel shoe sys tem have lost single empennage due snagged tailwheels tailwheel runs gopher hole rubberband breaks taliwbeel shoe comes free fuse lage plastic clevis pops open plane lands safely ready flown again after assembly new rubberband short time ago received note editor contained following formation have fantastic success Simitar number plan As two months ago Bill Evans sold 3000 wing cores indicates state fusion goes beyond mag azine saw happen once before Model Airplane News sold 8000 Smog Hog plans What makes new information interesting vari ety types Bill derived original design Theres no doubt different looking airplane always draws interest flying field flies well bound lot copies building board shortly afterward Thats what happened Bill Evans Simitar Simitar XV first product review product review product review appeared contruction article De cember 76 issue Model Aviation Na tionwide interest response defi nitely different craft gives indication Simitar design will given credit making flying wing practical reality within grasp RC pilots Bill has designed built no less 30 flying wings Among have both gliders powered airplanes Glid ers Saracen RCM April 1976 72 glider Little Saracen 48 glider Super Saracen 120 glider Power Simitar RCM December 1976 Simitar XV MA December 1976 Simitar XV now has improved upon include motor control steerable tri cycle landing gear epoxy fiberglass fuselage molded-in canopy air takes firewall removable engine cowl Simitar XV K&B 40 have Simitar 540 thats end Bill has now de veloped series Simitar Twins first pictured above powered two Cox Medallion 09s two channel using elevons no engine control After engine quits 31/2-pounder main tains altitude 09 also 049 Twin well 19 Twin now flying 40 Twin soon come What next Well Bill says bot tom line will complete negative stagger twin-engine Simitar Bi Wing Guess well have wait see Next months column will include August1978 87 product review product review product review Seen loledo Four-bladed rigid rotor fully aerobatic helicopter American RC Helicop ters Inc 23811 Via Fabricante Mission Vie jo CA 92675
Edition: Model Aviation - 1978/08
Page Numbers: 13, 14, 15, 16, 17, 18, 85, 86, 87
tcIi iheritmi udels altec aircr area about namic Si uld have ecame m re ifier ri rse ood hich I/B PLY 1 SA CRADLESI/4X 5/8 FORM AF SULLIVAN - FOR WING SE1DNDINTO Ck N N 2 F Va 1 34 SP 3/32 iR 1/A SCOOP / 1 1/4 HARD BALSA FIN L EDGE /4X 5/8 BALSA LEDGE AND SPAR 1/16 TOPAND BOTTOM PLANKING 1/16 BALSA RIBS ER 1/4 BALSA TIP CK AND RUDDER am ailerons w Special muffler fw aae too often ignore4axim s nifty proflielmance milned Solution rolling light t -if anyone wants less thrust required factors interrelated object goad de sign use best compromise compromise must What made objectives easy accomplish recent introduction K&B 40 model 9000 engine plus Macs Products special muffler use Normally am design around particular product Solution doing probably ab solutely necessary other engines provide ample power However model 9000 amplifies dvantagCs design engine really does have power normal 60 about half weight considerably smaller size Less engine weight site means less struc tural weight lower drag Lower fuel consumption helps 40 will turn 60size propeller higher rpm normal 60 So what hot about Solution Its structure ~rodynamics dif ferent outstanding thing learn pylon racing build light strong durable airframes Much learned racers has applied design might question use power pod utility obvious fact excellent power vibration absorber 15 also provides neat way enclose ww unit t ovabl pyic necessities needed other t mounts disappear pod effort worthwhile wing heart aircr2ft greater efficiency wing remainder aircraft must cc ute great extent wing cc flying speed because dra duces Drag affected si wing airfoil used very low-drag airfoil used greater control speed tne larger wing lift greater center airfoil NACA 65015 about finest foil avail able use thickness top efficiency range anything thicker would nothing add drag An airfoil progression also used changing 65015 root 65012 tip 65012 stable has less drag wish tips stable course less tip drag center drag moved closer center r craft wish concentrate dr weight close possible cei craft greatest stability Effic would greater higher aspect compromise necessary whe euverabiity required Dihedral desirable oft carded recent designs obt sneaky way Because th taper major portion dib obtained putting di intoi~ttntT wit dihec tail nenoerate Note tne center ot rudder area near thrust line hinge line slanted thrust line Such arrangement removes rolling action rudder applied maneuvers horizontal tail minimum size because good airfoil such tail elevator movement minimized As elevator moved airfoil changes full symmetrical m under Thp Hank Clark wE System parts laid omj ag de oIutIon cannot cowled engine F cowled pressure cowl enging will nc suiding craft Any Intl flow around taken around disturbed no r result nose Witi snapped picture th -wheel gear eliminates w ducing drag intake allowing air enter entire engine air just intakes proper i must created past does happen mounted pocket designs cylinder i very little air move fuselage inclu always pain have less pain necessary distinct asset use airfoils pattern ering scale effect ds above desira does take much m bulate off trailing tion occurs enqi joins fuselage w Combination along fusela d Under extrer nt air can affect solid airflow call fish Drovide tail rce arrangement dete toes its work el force arrai eveiopment bit better arrangement rfoil develop tack mu vity create lht time rero angle great equal will remain g enough erted iange choc wings angle inci& stabilizer has t ate tail lift p udel will tend speed ch lift created determined ositive will create 1p inter c NOW WHAT EVERYONES BEEN WAITING FOR BEELPAE L Please send complete utalog -Enclosed Si 00 refunded NAME first order Add 550 1st clam mail return add $100 handling other ADDRESS sophisticated piece lab quality equipment cycling ni-cd batteries Accurate dependable attractive --Automatic discharging recharging both re ceiver transmitter batteries simultaneously independently --Switch three different transmitter voltages 6V 96V 12V --Switch two different receiver charge rates 20 ma 50 ma --Four digit LED readout no mechanical clock motors --Modern design tight tolerance components sure total accuracy down lOb 1/10 minute --Available kit form assembled tested -I AF mi Efl1 interference can easily get point particularly true shielded wire making connection broken connections dirty have check out possibilities before making decision Ultimately simple solution keep trans mitter antenna collapsed much possible seek out locations alignments antenna pro duce least interference Several people have requested informa tion Art Cervenkas castoring nose wheel Ranger 42 ways get effect shown Fig 3 works need some pieces 3/32 ID brass tubing piece 3/32 OD music wire some 20gauge copper wire solder rubber band Keep letters coming folks makes feel wanted George Myers 70 Froelich Farm Rd Hicksville NY 11801 Solution/deBolt continued page 18 wing considering flat plate drag Drag also increases square speed As speed increases drag wing rises quickly rest craft As far maintaining straight flight over Now Hobbypoxy PFX H85 Polyester Filler compound white can great level ing dips dents wrin kies chips other im perfections fiberglass parts brilliant white polyester resin paste form non-sagging fast setting feathers out zero thickness peeling flaking Fuel-proof can filed drilled sanded Price $275 per pint catalyst Formula 3H53 Thixo tropic Epoxy Glue stays put no sag runs dips vertical surfaces Its controlled viscosity allows applied vertical surfaces thin edges other prob lem areas other glues just run off Price $450 per set two 4-az cans Pettit Paint Co 36 Pine St Borough Rockaway NJ 07866 product review product review product review wide speed range concerned need something compensate shift center drag caused wing accomplished placing line thrust above center resistance Thrust decreases proportionally speed action used counteract wing drag also proportional speed obtain optimum performance aerobatic model need will require least amount con trol quality called pointing neutral stability Once pointed craft stays exactly course until control action changes its heading com pleting maneuver neutralizing con trols turns control flight over aerodynamic controls designed model force arrangementmore pilot abilitycontributes action could continue describe little design details add overall quality Solution Such things wing taper using bit sweepback cer tainly important de tails However will recognize things Pattern design new im portant have proper basics add details Solution does because abnormal attention paid drag re duction unusual amount lift avail able efficient wing light wing loading course ample thrust provided powerpl ant Windy weather performance bound August1978 85 34G15 Ace Digipace assembled $9495 34G16 Ace Digipace kit 7995 BOX SUE HIGGINSVILLE MO product review product review product review FINE QUALITY KITS AND ACCESSORIES p p -7GEE BEE RACER 1/32 NORTHROP GAMMA BOEING 247 1/72 MARTIN B lOB 1/72 CURTISS C-46 1/72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND 50 FOR ILLUSTRATED CATALOG DEPARTMENT MA iai PAWNEE ST SAN MARCOS Ca 92069 question model will have good rough air performance penetrates well does change heading drifts wind flying cross wind Low drag ample thrust provide good pene tration properly located center lat eral area will help maintain headings cross wind Construction Since wanted low wing loading optimum performance no foam fiber glass used Templates provided foam wing foam wing will add least oam CG panel will moved farther out wing loss wing stability fiber glass fuselage could produced nose length would probably have increased balance Wing Structural strength enhanced use stressed skin Practically strength comes outer skin case skin must laminate Although wing has wood covering satisfactory just fill wood resin method cover stretchable plastics fabric needs tightly bonded sheet covering used Silron fabric attached common dope goes easily once place re quires little sanding filling An alter nate -oz fiberglass cloth applied resinmore work bit heavier stressed skin principle much internal structure eliminated adding simplicity landing gear mounts etc used work additional struc ture once performed wing assembly method recent development assures absolutely true wing making assembly simply job sticking parts together dihe dral board must jig set up bottom wing faces up angle board will match dihedral top wing Wing assembly saddle jigs fabricated Using wing plan dimensions locations jigs determined board secured place Sheeting top skin glued up roughly sized Press sheeting saddle jigs using appro priate ribs determines exact out line wing sheeting final sizing can made Assembly commences spar followed ribs form sheeting jigs simply matter sticking various parts place finishing main struc ture planking bottom 3-in sheeting wing tips different No blocks used saving several ounces crit ical area No carving shaping needed wing out jig top sheeting will extend past end ribs cut tip shape shown large flat sanding block bottom trued up accept tip plate done sanding fore aft tip plate will mate neatly end rib bottom edge tip sheeting top tip plate should form smooth surface no sanding required Tail Stressed skin used same jig method can used However might want use other method shown works well small structures centerline method Begin leading trailing edges product review product review product review Douglas World Cruiser discriminating plastic model builder feel aeronau tical history love airplanes well aware Williams Bros line history makers Now added 1/72-scale rendition Douglas World Cruiser small group planes flew around world 1924 elapsed time 175 days De cals allow finishing model five planes group An important plus provision wheels pontoons since planes used both during 27553 mile route $495 Williams Bros 181 Pawnee St San Marcos CA 92069 product review product review product review placed building board width great enough no portion structure will touch board Centerlines scribed ribs well leading trailing edges edges place insert ribs between obtaining alignment centerlines Once fastened add sheeting ready flip over structure add sheeting other side Shaping completes job Fuselage Except nose cowl pod area fuselage typical box faired top change bottom planked top fairing sheeted bottom Planking goes easily other method recent novation coat inside plank ing resin Hobby Poxy No 2 glue adding greatly strength durability foundation pod maple crutch As formidable looks simple machine tools can make cinchand costs pennies Scrounge small piece 5/4 1/s maple school shop lumberyard scrap pile have making two crutches wood easily shaped scroll jig band saw can done drill press Drill zillion holes around outline break away scrap straight sided router bit true outline can ground shape shaped full 5/4 maple crutch can run through table saw presto have two fuselage mount crutch 1/4 plywood simple shaping job locating shear pins hold-down screws first position crutch crutch clamped fuselage mounts use crutch holes drill guide Cowlings often chore en joy carving shaping balsa blocks described method construction avoids usual agony Assemble cowl lay ers engines vary shape crank case up does clearance required Mount engine hook up throttle linkage chop hole piece 1 balsa Slip balsa over cylinder enlarge hole eye until necessary clearances attained Cement first layer fuselage precision fits required next layer covers cylin der fins head Make tY2 diam hole another piece 1 stock slip over cylinder fit cylinder should close clearance carburetor muffler will need provided final layer will simply cap off cylinder head fair whole bottom fuselage As outside can rough shape layers build up otherwise will have big glob balsa attack carving knife sizing outside difficult because can hack off huge chunks during rough shaping important bring final shape down min imum maintaining smoothly flowing curves Covering Finishing have 86 Model Aviation r HOBBYPOXY FORMULA 3 THIXOTROPIC EPOXY GLUE NO SAGS. NO RUNS. NO DRIPS. Formula 3 specially formulated gel-like viscosity allowing applied vertical surfaces thin edges other problem areas other glues just run off makes Formula 3 perfect planking building up reinforcing fillets joints sealing cracks filling holes joining poorly fitted badly die-crushed parts . hundred other things youve always wished kind glue now its made Hobbypoxy leader epoxy glues model building Formula 3 packaged two four-ounce cans has working time hour cures hard overnight mmmxv renews L Division Pettit Paint co Inc 36 Pine Street Rockaway NJ 07866 favorite ways used Silron dope works extremely well requires lit tie effort provides excellent durability Cover forward section fuselage pod -oz fiberglass cloth finishing resin durable 100% fuelproof Cover aft section fu selage tail Silkspan paper dope Finish heavy coat Super Poxy primer followed colored Hobby Poxy desired final step coat clear Hobby Poxy seal everything place wish super finish sanding out clear adding coats will give optimum hope Solution will add flying pleasure know will save money RC Aerobatics/VanPutte continued page 21 Since adopting tailwheel shoe sys tem have lost single empennage due snagged tailwheels tailwheel runs gopher hole rubberband breaks taliwbeel shoe comes free fuse lage plastic clevis pops open plane lands safely ready flown again after assembly new rubberband short time ago received note editor contained following formation have fantastic success Simitar number plan As two months ago Bill Evans sold 3000 wing cores indicates state fusion goes beyond mag azine saw happen once before Model Airplane News sold 8000 Smog Hog plans What makes new information interesting vari ety types Bill derived original design Theres no doubt different looking airplane always draws interest flying field flies well bound lot copies building board shortly afterward Thats what happened Bill Evans Simitar Simitar XV first product review product review product review appeared contruction article De cember 76 issue Model Aviation Na tionwide interest response defi nitely different craft gives indication Simitar design will given credit making flying wing practical reality within grasp RC pilots Bill has designed built no less 30 flying wings Among have both gliders powered airplanes Glid ers Saracen RCM April 1976 72 glider Little Saracen 48 glider Super Saracen 120 glider Power Simitar RCM December 1976 Simitar XV MA December 1976 Simitar XV now has improved upon include motor control steerable tri cycle landing gear epoxy fiberglass fuselage molded-in canopy air takes firewall removable engine cowl Simitar XV K&B 40 have Simitar 540 thats end Bill has now de veloped series Simitar Twins first pictured above powered two Cox Medallion 09s two channel using elevons no engine control After engine quits 31/2-pounder main tains altitude 09 also 049 Twin well 19 Twin now flying 40 Twin soon come What next Well Bill says bot tom line will complete negative stagger twin-engine Simitar Bi Wing Guess well have wait see Next months column will include August1978 87 product review product review product review Seen loledo Four-bladed rigid rotor fully aerobatic helicopter American RC Helicop ters Inc 23811 Via Fabricante Mission Vie jo CA 92675
Edition: Model Aviation - 1978/08
Page Numbers: 13, 14, 15, 16, 17, 18, 85, 86, 87
tcIi iheritmi udels altec aircr area about namic Si uld have ecame m re ifier ri rse ood hich I/B PLY 1 SA CRADLESI/4X 5/8 FORM AF SULLIVAN - FOR WING SE1DNDINTO Ck N N 2 F Va 1 34 SP 3/32 iR 1/A SCOOP / 1 1/4 HARD BALSA FIN L EDGE /4X 5/8 BALSA LEDGE AND SPAR 1/16 TOPAND BOTTOM PLANKING 1/16 BALSA RIBS ER 1/4 BALSA TIP CK AND RUDDER am ailerons w Special muffler fw aae too often ignore4axim s nifty proflielmance milned Solution rolling light t -if anyone wants less thrust required factors interrelated object goad de sign use best compromise compromise must What made objectives easy accomplish recent introduction K&B 40 model 9000 engine plus Macs Products special muffler use Normally am design around particular product Solution doing probably ab solutely necessary other engines provide ample power However model 9000 amplifies dvantagCs design engine really does have power normal 60 about half weight considerably smaller size Less engine weight site means less struc tural weight lower drag Lower fuel consumption helps 40 will turn 60size propeller higher rpm normal 60 So what hot about Solution Its structure ~rodynamics dif ferent outstanding thing learn pylon racing build light strong durable airframes Much learned racers has applied design might question use power pod utility obvious fact excellent power vibration absorber 15 also provides neat way enclose ww unit t ovabl pyic necessities needed other t mounts disappear pod effort worthwhile wing heart aircr2ft greater efficiency wing remainder aircraft must cc ute great extent wing cc flying speed because dra duces Drag affected si wing airfoil used very low-drag airfoil used greater control speed tne larger wing lift greater center airfoil NACA 65015 about finest foil avail able use thickness top efficiency range anything thicker would nothing add drag An airfoil progression also used changing 65015 root 65012 tip 65012 stable has less drag wish tips stable course less tip drag center drag moved closer center r craft wish concentrate dr weight close possible cei craft greatest stability Effic would greater higher aspect compromise necessary whe euverabiity required Dihedral desirable oft carded recent designs obt sneaky way Because th taper major portion dib obtained putting di intoi~ttntT wit dihec tail nenoerate Note tne center ot rudder area near thrust line hinge line slanted thrust line Such arrangement removes rolling action rudder applied maneuvers horizontal tail minimum size because good airfoil such tail elevator movement minimized As elevator moved airfoil changes full symmetrical m under Thp Hank Clark wE System parts laid omj ag de oIutIon cannot cowled engine F cowled pressure cowl enging will nc suiding craft Any Intl flow around taken around disturbed no r result nose Witi snapped picture th -wheel gear eliminates w ducing drag intake allowing air enter entire engine air just intakes proper i must created past does happen mounted pocket designs cylinder i very little air move fuselage inclu always pain have less pain necessary distinct asset use airfoils pattern ering scale effect ds above desira does take much m bulate off trailing tion occurs enqi joins fuselage w Combination along fusela d Under extrer nt air can affect solid airflow call fish Drovide tail rce arrangement dete toes its work el force arrai eveiopment bit better arrangement rfoil develop tack mu vity create lht time rero angle great equal will remain g enough erted iange choc wings angle inci& stabilizer has t ate tail lift p udel will tend speed ch lift created determined ositive will create 1p inter c NOW WHAT EVERYONES BEEN WAITING FOR BEELPAE L Please send complete utalog -Enclosed Si 00 refunded NAME first order Add 550 1st clam mail return add $100 handling other ADDRESS sophisticated piece lab quality equipment cycling ni-cd batteries Accurate dependable attractive --Automatic discharging recharging both re ceiver transmitter batteries simultaneously independently --Switch three different transmitter voltages 6V 96V 12V --Switch two different receiver charge rates 20 ma 50 ma --Four digit LED readout no mechanical clock motors --Modern design tight tolerance components sure total accuracy down lOb 1/10 minute --Available kit form assembled tested -I AF mi Efl1 interference can easily get point particularly true shielded wire making connection broken connections dirty have check out possibilities before making decision Ultimately simple solution keep trans mitter antenna collapsed much possible seek out locations alignments antenna pro duce least interference Several people have requested informa tion Art Cervenkas castoring nose wheel Ranger 42 ways get effect shown Fig 3 works need some pieces 3/32 ID brass tubing piece 3/32 OD music wire some 20gauge copper wire solder rubber band Keep letters coming folks makes feel wanted George Myers 70 Froelich Farm Rd Hicksville NY 11801 Solution/deBolt continued page 18 wing considering flat plate drag Drag also increases square speed As speed increases drag wing rises quickly rest craft As far maintaining straight flight over Now Hobbypoxy PFX H85 Polyester Filler compound white can great level ing dips dents wrin kies chips other im perfections fiberglass parts brilliant white polyester resin paste form non-sagging fast setting feathers out zero thickness peeling flaking Fuel-proof can filed drilled sanded Price $275 per pint catalyst Formula 3H53 Thixo tropic Epoxy Glue stays put no sag runs dips vertical surfaces Its controlled viscosity allows applied vertical surfaces thin edges other prob lem areas other glues just run off Price $450 per set two 4-az cans Pettit Paint Co 36 Pine St Borough Rockaway NJ 07866 product review product review product review wide speed range concerned need something compensate shift center drag caused wing accomplished placing line thrust above center resistance Thrust decreases proportionally speed action used counteract wing drag also proportional speed obtain optimum performance aerobatic model need will require least amount con trol quality called pointing neutral stability Once pointed craft stays exactly course until control action changes its heading com pleting maneuver neutralizing con trols turns control flight over aerodynamic controls designed model force arrangementmore pilot abilitycontributes action could continue describe little design details add overall quality Solution Such things wing taper using bit sweepback cer tainly important de tails However will recognize things Pattern design new im portant have proper basics add details Solution does because abnormal attention paid drag re duction unusual amount lift avail able efficient wing light wing loading course ample thrust provided powerpl ant Windy weather performance bound August1978 85 34G15 Ace Digipace assembled $9495 34G16 Ace Digipace kit 7995 BOX SUE HIGGINSVILLE MO product review product review product review FINE QUALITY KITS AND ACCESSORIES p p -7GEE BEE RACER 1/32 NORTHROP GAMMA BOEING 247 1/72 MARTIN B lOB 1/72 CURTISS C-46 1/72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND 50 FOR ILLUSTRATED CATALOG DEPARTMENT MA iai PAWNEE ST SAN MARCOS Ca 92069 question model will have good rough air performance penetrates well does change heading drifts wind flying cross wind Low drag ample thrust provide good pene tration properly located center lat eral area will help maintain headings cross wind Construction Since wanted low wing loading optimum performance no foam fiber glass used Templates provided foam wing foam wing will add least oam CG panel will moved farther out wing loss wing stability fiber glass fuselage could produced nose length would probably have increased balance Wing Structural strength enhanced use stressed skin Practically strength comes outer skin case skin must laminate Although wing has wood covering satisfactory just fill wood resin method cover stretchable plastics fabric needs tightly bonded sheet covering used Silron fabric attached common dope goes easily once place re quires little sanding filling An alter nate -oz fiberglass cloth applied resinmore work bit heavier stressed skin principle much internal structure eliminated adding simplicity landing gear mounts etc used work additional struc ture once performed wing assembly method recent development assures absolutely true wing making assembly simply job sticking parts together dihe dral board must jig set up bottom wing faces up angle board will match dihedral top wing Wing assembly saddle jigs fabricated Using wing plan dimensions locations jigs determined board secured place Sheeting top skin glued up roughly sized Press sheeting saddle jigs using appro priate ribs determines exact out line wing sheeting final sizing can made Assembly commences spar followed ribs form sheeting jigs simply matter sticking various parts place finishing main struc ture planking bottom 3-in sheeting wing tips different No blocks used saving several ounces crit ical area No carving shaping needed wing out jig top sheeting will extend past end ribs cut tip shape shown large flat sanding block bottom trued up accept tip plate done sanding fore aft tip plate will mate neatly end rib bottom edge tip sheeting top tip plate should form smooth surface no sanding required Tail Stressed skin used same jig method can used However might want use other method shown works well small structures centerline method Begin leading trailing edges product review product review product review Douglas World Cruiser discriminating plastic model builder feel aeronau tical history love airplanes well aware Williams Bros line history makers Now added 1/72-scale rendition Douglas World Cruiser small group planes flew around world 1924 elapsed time 175 days De cals allow finishing model five planes group An important plus provision wheels pontoons since planes used both during 27553 mile route $495 Williams Bros 181 Pawnee St San Marcos CA 92069 product review product review product review placed building board width great enough no portion structure will touch board Centerlines scribed ribs well leading trailing edges edges place insert ribs between obtaining alignment centerlines Once fastened add sheeting ready flip over structure add sheeting other side Shaping completes job Fuselage Except nose cowl pod area fuselage typical box faired top change bottom planked top fairing sheeted bottom Planking goes easily other method recent novation coat inside plank ing resin Hobby Poxy No 2 glue adding greatly strength durability foundation pod maple crutch As formidable looks simple machine tools can make cinchand costs pennies Scrounge small piece 5/4 1/s maple school shop lumberyard scrap pile have making two crutches wood easily shaped scroll jig band saw can done drill press Drill zillion holes around outline break away scrap straight sided router bit true outline can ground shape shaped full 5/4 maple crutch can run through table saw presto have two fuselage mount crutch 1/4 plywood simple shaping job locating shear pins hold-down screws first position crutch crutch clamped fuselage mounts use crutch holes drill guide Cowlings often chore en joy carving shaping balsa blocks described method construction avoids usual agony Assemble cowl lay ers engines vary shape crank case up does clearance required Mount engine hook up throttle linkage chop hole piece 1 balsa Slip balsa over cylinder enlarge hole eye until necessary clearances attained Cement first layer fuselage precision fits required next layer covers cylin der fins head Make tY2 diam hole another piece 1 stock slip over cylinder fit cylinder should close clearance carburetor muffler will need provided final layer will simply cap off cylinder head fair whole bottom fuselage As outside can rough shape layers build up otherwise will have big glob balsa attack carving knife sizing outside difficult because can hack off huge chunks during rough shaping important bring final shape down min imum maintaining smoothly flowing curves Covering Finishing have 86 Model Aviation r HOBBYPOXY FORMULA 3 THIXOTROPIC EPOXY GLUE NO SAGS. NO RUNS. NO DRIPS. Formula 3 specially formulated gel-like viscosity allowing applied vertical surfaces thin edges other problem areas other glues just run off makes Formula 3 perfect planking building up reinforcing fillets joints sealing cracks filling holes joining poorly fitted badly die-crushed parts . hundred other things youve always wished kind glue now its made Hobbypoxy leader epoxy glues model building Formula 3 packaged two four-ounce cans has working time hour cures hard overnight mmmxv renews L Division Pettit Paint co Inc 36 Pine Street Rockaway NJ 07866 favorite ways used Silron dope works extremely well requires lit tie effort provides excellent durability Cover forward section fuselage pod -oz fiberglass cloth finishing resin durable 100% fuelproof Cover aft section fu selage tail Silkspan paper dope Finish heavy coat Super Poxy primer followed colored Hobby Poxy desired final step coat clear Hobby Poxy seal everything place wish super finish sanding out clear adding coats will give optimum hope Solution will add flying pleasure know will save money RC Aerobatics/VanPutte continued page 21 Since adopting tailwheel shoe sys tem have lost single empennage due snagged tailwheels tailwheel runs gopher hole rubberband breaks taliwbeel shoe comes free fuse lage plastic clevis pops open plane lands safely ready flown again after assembly new rubberband short time ago received note editor contained following formation have fantastic success Simitar number plan As two months ago Bill Evans sold 3000 wing cores indicates state fusion goes beyond mag azine saw happen once before Model Airplane News sold 8000 Smog Hog plans What makes new information interesting vari ety types Bill derived original design Theres no doubt different looking airplane always draws interest flying field flies well bound lot copies building board shortly afterward Thats what happened Bill Evans Simitar Simitar XV first product review product review product review appeared contruction article De cember 76 issue Model Aviation Na tionwide interest response defi nitely different craft gives indication Simitar design will given credit making flying wing practical reality within grasp RC pilots Bill has designed built no less 30 flying wings Among have both gliders powered airplanes Glid ers Saracen RCM April 1976 72 glider Little Saracen 48 glider Super Saracen 120 glider Power Simitar RCM December 1976 Simitar XV MA December 1976 Simitar XV now has improved upon include motor control steerable tri cycle landing gear epoxy fiberglass fuselage molded-in canopy air takes firewall removable engine cowl Simitar XV K&B 40 have Simitar 540 thats end Bill has now de veloped series Simitar Twins first pictured above powered two Cox Medallion 09s two channel using elevons no engine control After engine quits 31/2-pounder main tains altitude 09 also 049 Twin well 19 Twin now flying 40 Twin soon come What next Well Bill says bot tom line will complete negative stagger twin-engine Simitar Bi Wing Guess well have wait see Next months column will include August1978 87 product review product review product review Seen loledo Four-bladed rigid rotor fully aerobatic helicopter American RC Helicop ters Inc 23811 Via Fabricante Mission Vie jo CA 92675
Edition: Model Aviation - 1978/08
Page Numbers: 13, 14, 15, 16, 17, 18, 85, 86, 87
tcIi iheritmi udels altec aircr area about namic Si uld have ecame m re ifier ri rse ood hich I/B PLY 1 SA CRADLESI/4X 5/8 FORM AF SULLIVAN - FOR WING SE1DNDINTO Ck N N 2 F Va 1 34 SP 3/32 iR 1/A SCOOP / 1 1/4 HARD BALSA FIN L EDGE /4X 5/8 BALSA LEDGE AND SPAR 1/16 TOPAND BOTTOM PLANKING 1/16 BALSA RIBS ER 1/4 BALSA TIP CK AND RUDDER am ailerons w Special muffler fw aae too often ignore4axim s nifty proflielmance milned Solution rolling light t -if anyone wants less thrust required factors interrelated object goad de sign use best compromise compromise must What made objectives easy accomplish recent introduction K&B 40 model 9000 engine plus Macs Products special muffler use Normally am design around particular product Solution doing probably ab solutely necessary other engines provide ample power However model 9000 amplifies dvantagCs design engine really does have power normal 60 about half weight considerably smaller size Less engine weight site means less struc tural weight lower drag Lower fuel consumption helps 40 will turn 60size propeller higher rpm normal 60 So what hot about Solution Its structure ~rodynamics dif ferent outstanding thing learn pylon racing build light strong durable airframes Much learned racers has applied design might question use power pod utility obvious fact excellent power vibration absorber 15 also provides neat way enclose ww unit t ovabl pyic necessities needed other t mounts disappear pod effort worthwhile wing heart aircr2ft greater efficiency wing remainder aircraft must cc ute great extent wing cc flying speed because dra duces Drag affected si wing airfoil used very low-drag airfoil used greater control speed tne larger wing lift greater center airfoil NACA 65015 about finest foil avail able use thickness top efficiency range anything thicker would nothing add drag An airfoil progression also used changing 65015 root 65012 tip 65012 stable has less drag wish tips stable course less tip drag center drag moved closer center r craft wish concentrate dr weight close possible cei craft greatest stability Effic would greater higher aspect compromise necessary whe euverabiity required Dihedral desirable oft carded recent designs obt sneaky way Because th taper major portion dib obtained putting di intoi~ttntT wit dihec tail nenoerate Note tne center ot rudder area near thrust line hinge line slanted thrust line Such arrangement removes rolling action rudder applied maneuvers horizontal tail minimum size because good airfoil such tail elevator movement minimized As elevator moved airfoil changes full symmetrical m under Thp Hank Clark wE System parts laid omj ag de oIutIon cannot cowled engine F cowled pressure cowl enging will nc suiding craft Any Intl flow around taken around disturbed no r result nose Witi snapped picture th -wheel gear eliminates w ducing drag intake allowing air enter entire engine air just intakes proper i must created past does happen mounted pocket designs cylinder i very little air move fuselage inclu always pain have less pain necessary distinct asset use airfoils pattern ering scale effect ds above desira does take much m bulate off trailing tion occurs enqi joins fuselage w Combination along fusela d Under extrer nt air can affect solid airflow call fish Drovide tail rce arrangement dete toes its work el force arrai eveiopment bit better arrangement rfoil develop tack mu vity create lht time rero angle great equal will remain g enough erted iange choc wings angle inci& stabilizer has t ate tail lift p udel will tend speed ch lift created determined ositive will create 1p inter c NOW WHAT EVERYONES BEEN WAITING FOR BEELPAE L Please send complete utalog -Enclosed Si 00 refunded NAME first order Add 550 1st clam mail return add $100 handling other ADDRESS sophisticated piece lab quality equipment cycling ni-cd batteries Accurate dependable attractive --Automatic discharging recharging both re ceiver transmitter batteries simultaneously independently --Switch three different transmitter voltages 6V 96V 12V --Switch two different receiver charge rates 20 ma 50 ma --Four digit LED readout no mechanical clock motors --Modern design tight tolerance components sure total accuracy down lOb 1/10 minute --Available kit form assembled tested -I AF mi Efl1 interference can easily get point particularly true shielded wire making connection broken connections dirty have check out possibilities before making decision Ultimately simple solution keep trans mitter antenna collapsed much possible seek out locations alignments antenna pro duce least interference Several people have requested informa tion Art Cervenkas castoring nose wheel Ranger 42 ways get effect shown Fig 3 works need some pieces 3/32 ID brass tubing piece 3/32 OD music wire some 20gauge copper wire solder rubber band Keep letters coming folks makes feel wanted George Myers 70 Froelich Farm Rd Hicksville NY 11801 Solution/deBolt continued page 18 wing considering flat plate drag Drag also increases square speed As speed increases drag wing rises quickly rest craft As far maintaining straight flight over Now Hobbypoxy PFX H85 Polyester Filler compound white can great level ing dips dents wrin kies chips other im perfections fiberglass parts brilliant white polyester resin paste form non-sagging fast setting feathers out zero thickness peeling flaking Fuel-proof can filed drilled sanded Price $275 per pint catalyst Formula 3H53 Thixo tropic Epoxy Glue stays put no sag runs dips vertical surfaces Its controlled viscosity allows applied vertical surfaces thin edges other prob lem areas other glues just run off Price $450 per set two 4-az cans Pettit Paint Co 36 Pine St Borough Rockaway NJ 07866 product review product review product review wide speed range concerned need something compensate shift center drag caused wing accomplished placing line thrust above center resistance Thrust decreases proportionally speed action used counteract wing drag also proportional speed obtain optimum performance aerobatic model need will require least amount con trol quality called pointing neutral stability Once pointed craft stays exactly course until control action changes its heading com pleting maneuver neutralizing con trols turns control flight over aerodynamic controls designed model force arrangementmore pilot abilitycontributes action could continue describe little design details add overall quality Solution Such things wing taper using bit sweepback cer tainly important de tails However will recognize things Pattern design new im portant have proper basics add details Solution does because abnormal attention paid drag re duction unusual amount lift avail able efficient wing light wing loading course ample thrust provided powerpl ant Windy weather performance bound August1978 85 34G15 Ace Digipace assembled $9495 34G16 Ace Digipace kit 7995 BOX SUE HIGGINSVILLE MO product review product review product review FINE QUALITY KITS AND ACCESSORIES p p -7GEE BEE RACER 1/32 NORTHROP GAMMA BOEING 247 1/72 MARTIN B lOB 1/72 CURTISS C-46 1/72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND 50 FOR ILLUSTRATED CATALOG DEPARTMENT MA iai PAWNEE ST SAN MARCOS Ca 92069 question model will have good rough air performance penetrates well does change heading drifts wind flying cross wind Low drag ample thrust provide good pene tration properly located center lat eral area will help maintain headings cross wind Construction Since wanted low wing loading optimum performance no foam fiber glass used Templates provided foam wing foam wing will add least oam CG panel will moved farther out wing loss wing stability fiber glass fuselage could produced nose length would probably have increased balance Wing Structural strength enhanced use stressed skin Practically strength comes outer skin case skin must laminate Although wing has wood covering satisfactory just fill wood resin method cover stretchable plastics fabric needs tightly bonded sheet covering used Silron fabric attached common dope goes easily once place re quires little sanding filling An alter nate -oz fiberglass cloth applied resinmore work bit heavier stressed skin principle much internal structure eliminated adding simplicity landing gear mounts etc used work additional struc ture once performed wing assembly method recent development assures absolutely true wing making assembly simply job sticking parts together dihe dral board must jig set up bottom wing faces up angle board will match dihedral top wing Wing assembly saddle jigs fabricated Using wing plan dimensions locations jigs determined board secured place Sheeting top skin glued up roughly sized Press sheeting saddle jigs using appro priate ribs determines exact out line wing sheeting final sizing can made Assembly commences spar followed ribs form sheeting jigs simply matter sticking various parts place finishing main struc ture planking bottom 3-in sheeting wing tips different No blocks used saving several ounces crit ical area No carving shaping needed wing out jig top sheeting will extend past end ribs cut tip shape shown large flat sanding block bottom trued up accept tip plate done sanding fore aft tip plate will mate neatly end rib bottom edge tip sheeting top tip plate should form smooth surface no sanding required Tail Stressed skin used same jig method can used However might want use other method shown works well small structures centerline method Begin leading trailing edges product review product review product review Douglas World Cruiser discriminating plastic model builder feel aeronau tical history love airplanes well aware Williams Bros line history makers Now added 1/72-scale rendition Douglas World Cruiser small group planes flew around world 1924 elapsed time 175 days De cals allow finishing model five planes group An important plus provision wheels pontoons since planes used both during 27553 mile route $495 Williams Bros 181 Pawnee St San Marcos CA 92069 product review product review product review placed building board width great enough no portion structure will touch board Centerlines scribed ribs well leading trailing edges edges place insert ribs between obtaining alignment centerlines Once fastened add sheeting ready flip over structure add sheeting other side Shaping completes job Fuselage Except nose cowl pod area fuselage typical box faired top change bottom planked top fairing sheeted bottom Planking goes easily other method recent novation coat inside plank ing resin Hobby Poxy No 2 glue adding greatly strength durability foundation pod maple crutch As formidable looks simple machine tools can make cinchand costs pennies Scrounge small piece 5/4 1/s maple school shop lumberyard scrap pile have making two crutches wood easily shaped scroll jig band saw can done drill press Drill zillion holes around outline break away scrap straight sided router bit true outline can ground shape shaped full 5/4 maple crutch can run through table saw presto have two fuselage mount crutch 1/4 plywood simple shaping job locating shear pins hold-down screws first position crutch crutch clamped fuselage mounts use crutch holes drill guide Cowlings often chore en joy carving shaping balsa blocks described method construction avoids usual agony Assemble cowl lay ers engines vary shape crank case up does clearance required Mount engine hook up throttle linkage chop hole piece 1 balsa Slip balsa over cylinder enlarge hole eye until necessary clearances attained Cement first layer fuselage precision fits required next layer covers cylin der fins head Make tY2 diam hole another piece 1 stock slip over cylinder fit cylinder should close clearance carburetor muffler will need provided final layer will simply cap off cylinder head fair whole bottom fuselage As outside can rough shape layers build up otherwise will have big glob balsa attack carving knife sizing outside difficult because can hack off huge chunks during rough shaping important bring final shape down min imum maintaining smoothly flowing curves Covering Finishing have 86 Model Aviation r HOBBYPOXY FORMULA 3 THIXOTROPIC EPOXY GLUE NO SAGS. NO RUNS. NO DRIPS. Formula 3 specially formulated gel-like viscosity allowing applied vertical surfaces thin edges other problem areas other glues just run off makes Formula 3 perfect planking building up reinforcing fillets joints sealing cracks filling holes joining poorly fitted badly die-crushed parts . hundred other things youve always wished kind glue now its made Hobbypoxy leader epoxy glues model building Formula 3 packaged two four-ounce cans has working time hour cures hard overnight mmmxv renews L Division Pettit Paint co Inc 36 Pine Street Rockaway NJ 07866 favorite ways used Silron dope works extremely well requires lit tie effort provides excellent durability Cover forward section fuselage pod -oz fiberglass cloth finishing resin durable 100% fuelproof Cover aft section fu selage tail Silkspan paper dope Finish heavy coat Super Poxy primer followed colored Hobby Poxy desired final step coat clear Hobby Poxy seal everything place wish super finish sanding out clear adding coats will give optimum hope Solution will add flying pleasure know will save money RC Aerobatics/VanPutte continued page 21 Since adopting tailwheel shoe sys tem have lost single empennage due snagged tailwheels tailwheel runs gopher hole rubberband breaks taliwbeel shoe comes free fuse lage plastic clevis pops open plane lands safely ready flown again after assembly new rubberband short time ago received note editor contained following formation have fantastic success Simitar number plan As two months ago Bill Evans sold 3000 wing cores indicates state fusion goes beyond mag azine saw happen once before Model Airplane News sold 8000 Smog Hog plans What makes new information interesting vari ety types Bill derived original design Theres no doubt different looking airplane always draws interest flying field flies well bound lot copies building board shortly afterward Thats what happened Bill Evans Simitar Simitar XV first product review product review product review appeared contruction article De cember 76 issue Model Aviation Na tionwide interest response defi nitely different craft gives indication Simitar design will given credit making flying wing practical reality within grasp RC pilots Bill has designed built no less 30 flying wings Among have both gliders powered airplanes Glid ers Saracen RCM April 1976 72 glider Little Saracen 48 glider Super Saracen 120 glider Power Simitar RCM December 1976 Simitar XV MA December 1976 Simitar XV now has improved upon include motor control steerable tri cycle landing gear epoxy fiberglass fuselage molded-in canopy air takes firewall removable engine cowl Simitar XV K&B 40 have Simitar 540 thats end Bill has now de veloped series Simitar Twins first pictured above powered two Cox Medallion 09s two channel using elevons no engine control After engine quits 31/2-pounder main tains altitude 09 also 049 Twin well 19 Twin now flying 40 Twin soon come What next Well Bill says bot tom line will complete negative stagger twin-engine Simitar Bi Wing Guess well have wait see Next months column will include August1978 87 product review product review product review Seen loledo Four-bladed rigid rotor fully aerobatic helicopter American RC Helicop ters Inc 23811 Via Fabricante Mission Vie jo CA 92675
Edition: Model Aviation - 1978/08
Page Numbers: 13, 14, 15, 16, 17, 18, 85, 86, 87
tcIi iheritmi udels altec aircr area about namic Si uld have ecame m re ifier ri rse ood hich I/B PLY 1 SA CRADLESI/4X 5/8 FORM AF SULLIVAN - FOR WING SE1DNDINTO Ck N N 2 F Va 1 34 SP 3/32 iR 1/A SCOOP / 1 1/4 HARD BALSA FIN L EDGE /4X 5/8 BALSA LEDGE AND SPAR 1/16 TOPAND BOTTOM PLANKING 1/16 BALSA RIBS ER 1/4 BALSA TIP CK AND RUDDER am ailerons w Special muffler fw aae too often ignore4axim s nifty proflielmance milned Solution rolling light t -if anyone wants less thrust required factors interrelated object goad de sign use best compromise compromise must What made objectives easy accomplish recent introduction K&B 40 model 9000 engine plus Macs Products special muffler use Normally am design around particular product Solution doing probably ab solutely necessary other engines provide ample power However model 9000 amplifies dvantagCs design engine really does have power normal 60 about half weight considerably smaller size Less engine weight site means less struc tural weight lower drag Lower fuel consumption helps 40 will turn 60size propeller higher rpm normal 60 So what hot about Solution Its structure ~rodynamics dif ferent outstanding thing learn pylon racing build light strong durable airframes Much learned racers has applied design might question use power pod utility obvious fact excellent power vibration absorber 15 also provides neat way enclose ww unit t ovabl pyic necessities needed other t mounts disappear pod effort worthwhile wing heart aircr2ft greater efficiency wing remainder aircraft must cc ute great extent wing cc flying speed because dra duces Drag affected si wing airfoil used very low-drag airfoil used greater control speed tne larger wing lift greater center airfoil NACA 65015 about finest foil avail able use thickness top efficiency range anything thicker would nothing add drag An airfoil progression also used changing 65015 root 65012 tip 65012 stable has less drag wish tips stable course less tip drag center drag moved closer center r craft wish concentrate dr weight close possible cei craft greatest stability Effic would greater higher aspect compromise necessary whe euverabiity required Dihedral desirable oft carded recent designs obt sneaky way Because th taper major portion dib obtained putting di intoi~ttntT wit dihec tail nenoerate Note tne center ot rudder area near thrust line hinge line slanted thrust line Such arrangement removes rolling action rudder applied maneuvers horizontal tail minimum size because good airfoil such tail elevator movement minimized As elevator moved airfoil changes full symmetrical m under Thp Hank Clark wE System parts laid omj ag de oIutIon cannot cowled engine F cowled pressure cowl enging will nc suiding craft Any Intl flow around taken around disturbed no r result nose Witi snapped picture th -wheel gear eliminates w ducing drag intake allowing air enter entire engine air just intakes proper i must created past does happen mounted pocket designs cylinder i very little air move fuselage inclu always pain have less pain necessary distinct asset use airfoils pattern ering scale effect ds above desira does take much m bulate off trailing tion occurs enqi joins fuselage w Combination along fusela d Under extrer nt air can affect solid airflow call fish Drovide tail rce arrangement dete toes its work el force arrai eveiopment bit better arrangement rfoil develop tack mu vity create lht time rero angle great equal will remain g enough erted iange choc wings angle inci& stabilizer has t ate tail lift p udel will tend speed ch lift created determined ositive will create 1p inter c NOW WHAT EVERYONES BEEN WAITING FOR BEELPAE L Please send complete utalog -Enclosed Si 00 refunded NAME first order Add 550 1st clam mail return add $100 handling other ADDRESS sophisticated piece lab quality equipment cycling ni-cd batteries Accurate dependable attractive --Automatic discharging recharging both re ceiver transmitter batteries simultaneously independently --Switch three different transmitter voltages 6V 96V 12V --Switch two different receiver charge rates 20 ma 50 ma --Four digit LED readout no mechanical clock motors --Modern design tight tolerance components sure total accuracy down lOb 1/10 minute --Available kit form assembled tested -I AF mi Efl1 interference can easily get point particularly true shielded wire making connection broken connections dirty have check out possibilities before making decision Ultimately simple solution keep trans mitter antenna collapsed much possible seek out locations alignments antenna pro duce least interference Several people have requested informa tion Art Cervenkas castoring nose wheel Ranger 42 ways get effect shown Fig 3 works need some pieces 3/32 ID brass tubing piece 3/32 OD music wire some 20gauge copper wire solder rubber band Keep letters coming folks makes feel wanted George Myers 70 Froelich Farm Rd Hicksville NY 11801 Solution/deBolt continued page 18 wing considering flat plate drag Drag also increases square speed As speed increases drag wing rises quickly rest craft As far maintaining straight flight over Now Hobbypoxy PFX H85 Polyester Filler compound white can great level ing dips dents wrin kies chips other im perfections fiberglass parts brilliant white polyester resin paste form non-sagging fast setting feathers out zero thickness peeling flaking Fuel-proof can filed drilled sanded Price $275 per pint catalyst Formula 3H53 Thixo tropic Epoxy Glue stays put no sag runs dips vertical surfaces Its controlled viscosity allows applied vertical surfaces thin edges other prob lem areas other glues just run off Price $450 per set two 4-az cans Pettit Paint Co 36 Pine St Borough Rockaway NJ 07866 product review product review product review wide speed range concerned need something compensate shift center drag caused wing accomplished placing line thrust above center resistance Thrust decreases proportionally speed action used counteract wing drag also proportional speed obtain optimum performance aerobatic model need will require least amount con trol quality called pointing neutral stability Once pointed craft stays exactly course until control action changes its heading com pleting maneuver neutralizing con trols turns control flight over aerodynamic controls designed model force arrangementmore pilot abilitycontributes action could continue describe little design details add overall quality Solution Such things wing taper using bit sweepback cer tainly important de tails However will recognize things Pattern design new im portant have proper basics add details Solution does because abnormal attention paid drag re duction unusual amount lift avail able efficient wing light wing loading course ample thrust provided powerpl ant Windy weather performance bound August1978 85 34G15 Ace Digipace assembled $9495 34G16 Ace Digipace kit 7995 BOX SUE HIGGINSVILLE MO product review product review product review FINE QUALITY KITS AND ACCESSORIES p p -7GEE BEE RACER 1/32 NORTHROP GAMMA BOEING 247 1/72 MARTIN B lOB 1/72 CURTISS C-46 1/72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND 50 FOR ILLUSTRATED CATALOG DEPARTMENT MA iai PAWNEE ST SAN MARCOS Ca 92069 question model will have good rough air performance penetrates well does change heading drifts wind flying cross wind Low drag ample thrust provide good pene tration properly located center lat eral area will help maintain headings cross wind Construction Since wanted low wing loading optimum performance no foam fiber glass used Templates provided foam wing foam wing will add least oam CG panel will moved farther out wing loss wing stability fiber glass fuselage could produced nose length would probably have increased balance Wing Structural strength enhanced use stressed skin Practically strength comes outer skin case skin must laminate Although wing has wood covering satisfactory just fill wood resin method cover stretchable plastics fabric needs tightly bonded sheet covering used Silron fabric attached common dope goes easily once place re quires little sanding filling An alter nate -oz fiberglass cloth applied resinmore work bit heavier stressed skin principle much internal structure eliminated adding simplicity landing gear mounts etc used work additional struc ture once performed wing assembly method recent development assures absolutely true wing making assembly simply job sticking parts together dihe dral board must jig set up bottom wing faces up angle board will match dihedral top wing Wing assembly saddle jigs fabricated Using wing plan dimensions locations jigs determined board secured place Sheeting top skin glued up roughly sized Press sheeting saddle jigs using appro priate ribs determines exact out line wing sheeting final sizing can made Assembly commences spar followed ribs form sheeting jigs simply matter sticking various parts place finishing main struc ture planking bottom 3-in sheeting wing tips different No blocks used saving several ounces crit ical area No carving shaping needed wing out jig top sheeting will extend past end ribs cut tip shape shown large flat sanding block bottom trued up accept tip plate done sanding fore aft tip plate will mate neatly end rib bottom edge tip sheeting top tip plate should form smooth surface no sanding required Tail Stressed skin used same jig method can used However might want use other method shown works well small structures centerline method Begin leading trailing edges product review product review product review Douglas World Cruiser discriminating plastic model builder feel aeronau tical history love airplanes well aware Williams Bros line history makers Now added 1/72-scale rendition Douglas World Cruiser small group planes flew around world 1924 elapsed time 175 days De cals allow finishing model five planes group An important plus provision wheels pontoons since planes used both during 27553 mile route $495 Williams Bros 181 Pawnee St San Marcos CA 92069 product review product review product review placed building board width great enough no portion structure will touch board Centerlines scribed ribs well leading trailing edges edges place insert ribs between obtaining alignment centerlines Once fastened add sheeting ready flip over structure add sheeting other side Shaping completes job Fuselage Except nose cowl pod area fuselage typical box faired top change bottom planked top fairing sheeted bottom Planking goes easily other method recent novation coat inside plank ing resin Hobby Poxy No 2 glue adding greatly strength durability foundation pod maple crutch As formidable looks simple machine tools can make cinchand costs pennies Scrounge small piece 5/4 1/s maple school shop lumberyard scrap pile have making two crutches wood easily shaped scroll jig band saw can done drill press Drill zillion holes around outline break away scrap straight sided router bit true outline can ground shape shaped full 5/4 maple crutch can run through table saw presto have two fuselage mount crutch 1/4 plywood simple shaping job locating shear pins hold-down screws first position crutch crutch clamped fuselage mounts use crutch holes drill guide Cowlings often chore en joy carving shaping balsa blocks described method construction avoids usual agony Assemble cowl lay ers engines vary shape crank case up does clearance required Mount engine hook up throttle linkage chop hole piece 1 balsa Slip balsa over cylinder enlarge hole eye until necessary clearances attained Cement first layer fuselage precision fits required next layer covers cylin der fins head Make tY2 diam hole another piece 1 stock slip over cylinder fit cylinder should close clearance carburetor muffler will need provided final layer will simply cap off cylinder head fair whole bottom fuselage As outside can rough shape layers build up otherwise will have big glob balsa attack carving knife sizing outside difficult because can hack off huge chunks during rough shaping important bring final shape down min imum maintaining smoothly flowing curves Covering Finishing have 86 Model Aviation r HOBBYPOXY FORMULA 3 THIXOTROPIC EPOXY GLUE NO SAGS. NO RUNS. NO DRIPS. Formula 3 specially formulated gel-like viscosity allowing applied vertical surfaces thin edges other problem areas other glues just run off makes Formula 3 perfect planking building up reinforcing fillets joints sealing cracks filling holes joining poorly fitted badly die-crushed parts . hundred other things youve always wished kind glue now its made Hobbypoxy leader epoxy glues model building Formula 3 packaged two four-ounce cans has working time hour cures hard overnight mmmxv renews L Division Pettit Paint co Inc 36 Pine Street Rockaway NJ 07866 favorite ways used Silron dope works extremely well requires lit tie effort provides excellent durability Cover forward section fuselage pod -oz fiberglass cloth finishing resin durable 100% fuelproof Cover aft section fu selage tail Silkspan paper dope Finish heavy coat Super Poxy primer followed colored Hobby Poxy desired final step coat clear Hobby Poxy seal everything place wish super finish sanding out clear adding coats will give optimum hope Solution will add flying pleasure know will save money RC Aerobatics/VanPutte continued page 21 Since adopting tailwheel shoe sys tem have lost single empennage due snagged tailwheels tailwheel runs gopher hole rubberband breaks taliwbeel shoe comes free fuse lage plastic clevis pops open plane lands safely ready flown again after assembly new rubberband short time ago received note editor contained following formation have fantastic success Simitar number plan As two months ago Bill Evans sold 3000 wing cores indicates state fusion goes beyond mag azine saw happen once before Model Airplane News sold 8000 Smog Hog plans What makes new information interesting vari ety types Bill derived original design Theres no doubt different looking airplane always draws interest flying field flies well bound lot copies building board shortly afterward Thats what happened Bill Evans Simitar Simitar XV first product review product review product review appeared contruction article De cember 76 issue Model Aviation Na tionwide interest response defi nitely different craft gives indication Simitar design will given credit making flying wing practical reality within grasp RC pilots Bill has designed built no less 30 flying wings Among have both gliders powered airplanes Glid ers Saracen RCM April 1976 72 glider Little Saracen 48 glider Super Saracen 120 glider Power Simitar RCM December 1976 Simitar XV MA December 1976 Simitar XV now has improved upon include motor control steerable tri cycle landing gear epoxy fiberglass fuselage molded-in canopy air takes firewall removable engine cowl Simitar XV K&B 40 have Simitar 540 thats end Bill has now de veloped series Simitar Twins first pictured above powered two Cox Medallion 09s two channel using elevons no engine control After engine quits 31/2-pounder main tains altitude 09 also 049 Twin well 19 Twin now flying 40 Twin soon come What next Well Bill says bot tom line will complete negative stagger twin-engine Simitar Bi Wing Guess well have wait see Next months column will include August1978 87 product review product review product review Seen loledo Four-bladed rigid rotor fully aerobatic helicopter American RC Helicop ters Inc 23811 Via Fabricante Mission Vie jo CA 92675
Edition: Model Aviation - 1978/08
Page Numbers: 13, 14, 15, 16, 17, 18, 85, 86, 87
tcIi iheritmi udels altec aircr area about namic Si uld have ecame m re ifier ri rse ood hich I/B PLY 1 SA CRADLESI/4X 5/8 FORM AF SULLIVAN - FOR WING SE1DNDINTO Ck N N 2 F Va 1 34 SP 3/32 iR 1/A SCOOP / 1 1/4 HARD BALSA FIN L EDGE /4X 5/8 BALSA LEDGE AND SPAR 1/16 TOPAND BOTTOM PLANKING 1/16 BALSA RIBS ER 1/4 BALSA TIP CK AND RUDDER am ailerons w Special muffler fw aae too often ignore4axim s nifty proflielmance milned Solution rolling light t -if anyone wants less thrust required factors interrelated object goad de sign use best compromise compromise must What made objectives easy accomplish recent introduction K&B 40 model 9000 engine plus Macs Products special muffler use Normally am design around particular product Solution doing probably ab solutely necessary other engines provide ample power However model 9000 amplifies dvantagCs design engine really does have power normal 60 about half weight considerably smaller size Less engine weight site means less struc tural weight lower drag Lower fuel consumption helps 40 will turn 60size propeller higher rpm normal 60 So what hot about Solution Its structure ~rodynamics dif ferent outstanding thing learn pylon racing build light strong durable airframes Much learned racers has applied design might question use power pod utility obvious fact excellent power vibration absorber 15 also provides neat way enclose ww unit t ovabl pyic necessities needed other t mounts disappear pod effort worthwhile wing heart aircr2ft greater efficiency wing remainder aircraft must cc ute great extent wing cc flying speed because dra duces Drag affected si wing airfoil used very low-drag airfoil used greater control speed tne larger wing lift greater center airfoil NACA 65015 about finest foil avail able use thickness top efficiency range anything thicker would nothing add drag An airfoil progression also used changing 65015 root 65012 tip 65012 stable has less drag wish tips stable course less tip drag center drag moved closer center r craft wish concentrate dr weight close possible cei craft greatest stability Effic would greater higher aspect compromise necessary whe euverabiity required Dihedral desirable oft carded recent designs obt sneaky way Because th taper major portion dib obtained putting di intoi~ttntT wit dihec tail nenoerate Note tne center ot rudder area near thrust line hinge line slanted thrust line Such arrangement removes rolling action rudder applied maneuvers horizontal tail minimum size because good airfoil such tail elevator movement minimized As elevator moved airfoil changes full symmetrical m under Thp Hank Clark wE System parts laid omj ag de oIutIon cannot cowled engine F cowled pressure cowl enging will nc suiding craft Any Intl flow around taken around disturbed no r result nose Witi snapped picture th -wheel gear eliminates w ducing drag intake allowing air enter entire engine air just intakes proper i must created past does happen mounted pocket designs cylinder i very little air move fuselage inclu always pain have less pain necessary distinct asset use airfoils pattern ering scale effect ds above desira does take much m bulate off trailing tion occurs enqi joins fuselage w Combination along fusela d Under extrer nt air can affect solid airflow call fish Drovide tail rce arrangement dete toes its work el force arrai eveiopment bit better arrangement rfoil develop tack mu vity create lht time rero angle great equal will remain g enough erted iange choc wings angle inci& stabilizer has t ate tail lift p udel will tend speed ch lift created determined ositive will create 1p inter c NOW WHAT EVERYONES BEEN WAITING FOR BEELPAE L Please send complete utalog -Enclosed Si 00 refunded NAME first order Add 550 1st clam mail return add $100 handling other ADDRESS sophisticated piece lab quality equipment cycling ni-cd batteries Accurate dependable attractive --Automatic discharging recharging both re ceiver transmitter batteries simultaneously independently --Switch three different transmitter voltages 6V 96V 12V --Switch two different receiver charge rates 20 ma 50 ma --Four digit LED readout no mechanical clock motors --Modern design tight tolerance components sure total accuracy down lOb 1/10 minute --Available kit form assembled tested -I AF mi Efl1 interference can easily get point particularly true shielded wire making connection broken connections dirty have check out possibilities before making decision Ultimately simple solution keep trans mitter antenna collapsed much possible seek out locations alignments antenna pro duce least interference Several people have requested informa tion Art Cervenkas castoring nose wheel Ranger 42 ways get effect shown Fig 3 works need some pieces 3/32 ID brass tubing piece 3/32 OD music wire some 20gauge copper wire solder rubber band Keep letters coming folks makes feel wanted George Myers 70 Froelich Farm Rd Hicksville NY 11801 Solution/deBolt continued page 18 wing considering flat plate drag Drag also increases square speed As speed increases drag wing rises quickly rest craft As far maintaining straight flight over Now Hobbypoxy PFX H85 Polyester Filler compound white can great level ing dips dents wrin kies chips other im perfections fiberglass parts brilliant white polyester resin paste form non-sagging fast setting feathers out zero thickness peeling flaking Fuel-proof can filed drilled sanded Price $275 per pint catalyst Formula 3H53 Thixo tropic Epoxy Glue stays put no sag runs dips vertical surfaces Its controlled viscosity allows applied vertical surfaces thin edges other prob lem areas other glues just run off Price $450 per set two 4-az cans Pettit Paint Co 36 Pine St Borough Rockaway NJ 07866 product review product review product review wide speed range concerned need something compensate shift center drag caused wing accomplished placing line thrust above center resistance Thrust decreases proportionally speed action used counteract wing drag also proportional speed obtain optimum performance aerobatic model need will require least amount con trol quality called pointing neutral stability Once pointed craft stays exactly course until control action changes its heading com pleting maneuver neutralizing con trols turns control flight over aerodynamic controls designed model force arrangementmore pilot abilitycontributes action could continue describe little design details add overall quality Solution Such things wing taper using bit sweepback cer tainly important de tails However will recognize things Pattern design new im portant have proper basics add details Solution does because abnormal attention paid drag re duction unusual amount lift avail able efficient wing light wing loading course ample thrust provided powerpl ant Windy weather performance bound August1978 85 34G15 Ace Digipace assembled $9495 34G16 Ace Digipace kit 7995 BOX SUE HIGGINSVILLE MO product review product review product review FINE QUALITY KITS AND ACCESSORIES p p -7GEE BEE RACER 1/32 NORTHROP GAMMA BOEING 247 1/72 MARTIN B lOB 1/72 CURTISS C-46 1/72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND 50 FOR ILLUSTRATED CATALOG DEPARTMENT MA iai PAWNEE ST SAN MARCOS Ca 92069 question model will have good rough air performance penetrates well does change heading drifts wind flying cross wind Low drag ample thrust provide good pene tration properly located center lat eral area will help maintain headings cross wind Construction Since wanted low wing loading optimum performance no foam fiber glass used Templates provided foam wing foam wing will add least oam CG panel will moved farther out wing loss wing stability fiber glass fuselage could produced nose length would probably have increased balance Wing Structural strength enhanced use stressed skin Practically strength comes outer skin case skin must laminate Although wing has wood covering satisfactory just fill wood resin method cover stretchable plastics fabric needs tightly bonded sheet covering used Silron fabric attached common dope goes easily once place re quires little sanding filling An alter nate -oz fiberglass cloth applied resinmore work bit heavier stressed skin principle much internal structure eliminated adding simplicity landing gear mounts etc used work additional struc ture once performed wing assembly method recent development assures absolutely true wing making assembly simply job sticking parts together dihe dral board must jig set up bottom wing faces up angle board will match dihedral top wing Wing assembly saddle jigs fabricated Using wing plan dimensions locations jigs determined board secured place Sheeting top skin glued up roughly sized Press sheeting saddle jigs using appro priate ribs determines exact out line wing sheeting final sizing can made Assembly commences spar followed ribs form sheeting jigs simply matter sticking various parts place finishing main struc ture planking bottom 3-in sheeting wing tips different No blocks used saving several ounces crit ical area No carving shaping needed wing out jig top sheeting will extend past end ribs cut tip shape shown large flat sanding block bottom trued up accept tip plate done sanding fore aft tip plate will mate neatly end rib bottom edge tip sheeting top tip plate should form smooth surface no sanding required Tail Stressed skin used same jig method can used However might want use other method shown works well small structures centerline method Begin leading trailing edges product review product review product review Douglas World Cruiser discriminating plastic model builder feel aeronau tical history love airplanes well aware Williams Bros line history makers Now added 1/72-scale rendition Douglas World Cruiser small group planes flew around world 1924 elapsed time 175 days De cals allow finishing model five planes group An important plus provision wheels pontoons since planes used both during 27553 mile route $495 Williams Bros 181 Pawnee St San Marcos CA 92069 product review product review product review placed building board width great enough no portion structure will touch board Centerlines scribed ribs well leading trailing edges edges place insert ribs between obtaining alignment centerlines Once fastened add sheeting ready flip over structure add sheeting other side Shaping completes job Fuselage Except nose cowl pod area fuselage typical box faired top change bottom planked top fairing sheeted bottom Planking goes easily other method recent novation coat inside plank ing resin Hobby Poxy No 2 glue adding greatly strength durability foundation pod maple crutch As formidable looks simple machine tools can make cinchand costs pennies Scrounge small piece 5/4 1/s maple school shop lumberyard scrap pile have making two crutches wood easily shaped scroll jig band saw can done drill press Drill zillion holes around outline break away scrap straight sided router bit true outline can ground shape shaped full 5/4 maple crutch can run through table saw presto have two fuselage mount crutch 1/4 plywood simple shaping job locating shear pins hold-down screws first position crutch crutch clamped fuselage mounts use crutch holes drill guide Cowlings often chore en joy carving shaping balsa blocks described method construction avoids usual agony Assemble cowl lay ers engines vary shape crank case up does clearance required Mount engine hook up throttle linkage chop hole piece 1 balsa Slip balsa over cylinder enlarge hole eye until necessary clearances attained Cement first layer fuselage precision fits required next layer covers cylin der fins head Make tY2 diam hole another piece 1 stock slip over cylinder fit cylinder should close clearance carburetor muffler will need provided final layer will simply cap off cylinder head fair whole bottom fuselage As outside can rough shape layers build up otherwise will have big glob balsa attack carving knife sizing outside difficult because can hack off huge chunks during rough shaping important bring final shape down min imum maintaining smoothly flowing curves Covering Finishing have 86 Model Aviation r HOBBYPOXY FORMULA 3 THIXOTROPIC EPOXY GLUE NO SAGS. NO RUNS. NO DRIPS. Formula 3 specially formulated gel-like viscosity allowing applied vertical surfaces thin edges other problem areas other glues just run off makes Formula 3 perfect planking building up reinforcing fillets joints sealing cracks filling holes joining poorly fitted badly die-crushed parts . hundred other things youve always wished kind glue now its made Hobbypoxy leader epoxy glues model building Formula 3 packaged two four-ounce cans has working time hour cures hard overnight mmmxv renews L Division Pettit Paint co Inc 36 Pine Street Rockaway NJ 07866 favorite ways used Silron dope works extremely well requires lit tie effort provides excellent durability Cover forward section fuselage pod -oz fiberglass cloth finishing resin durable 100% fuelproof Cover aft section fu selage tail Silkspan paper dope Finish heavy coat Super Poxy primer followed colored Hobby Poxy desired final step coat clear Hobby Poxy seal everything place wish super finish sanding out clear adding coats will give optimum hope Solution will add flying pleasure know will save money RC Aerobatics/VanPutte continued page 21 Since adopting tailwheel shoe sys tem have lost single empennage due snagged tailwheels tailwheel runs gopher hole rubberband breaks taliwbeel shoe comes free fuse lage plastic clevis pops open plane lands safely ready flown again after assembly new rubberband short time ago received note editor contained following formation have fantastic success Simitar number plan As two months ago Bill Evans sold 3000 wing cores indicates state fusion goes beyond mag azine saw happen once before Model Airplane News sold 8000 Smog Hog plans What makes new information interesting vari ety types Bill derived original design Theres no doubt different looking airplane always draws interest flying field flies well bound lot copies building board shortly afterward Thats what happened Bill Evans Simitar Simitar XV first product review product review product review appeared contruction article De cember 76 issue Model Aviation Na tionwide interest response defi nitely different craft gives indication Simitar design will given credit making flying wing practical reality within grasp RC pilots Bill has designed built no less 30 flying wings Among have both gliders powered airplanes Glid ers Saracen RCM April 1976 72 glider Little Saracen 48 glider Super Saracen 120 glider Power Simitar RCM December 1976 Simitar XV MA December 1976 Simitar XV now has improved upon include motor control steerable tri cycle landing gear epoxy fiberglass fuselage molded-in canopy air takes firewall removable engine cowl Simitar XV K&B 40 have Simitar 540 thats end Bill has now de veloped series Simitar Twins first pictured above powered two Cox Medallion 09s two channel using elevons no engine control After engine quits 31/2-pounder main tains altitude 09 also 049 Twin well 19 Twin now flying 40 Twin soon come What next Well Bill says bot tom line will complete negative stagger twin-engine Simitar Bi Wing Guess well have wait see Next months column will include August1978 87 product review product review product review Seen loledo Four-bladed rigid rotor fully aerobatic helicopter American RC Helicop ters Inc 23811 Via Fabricante Mission Vie jo CA 92675