Control Line AEROBA TICS Wynn Paul THE SUBJECT control line handles What can Stunters now supply E-Z Just has exhausted Bob Hunt Gene Martine no longer producing handles No manufacturer prospective manufacturer Ive talked past couple years has wanted risk liability lawsuits caused demise E-Z Just So must improvise Fox Tat Sullivan handles available fit needs Lets examine some characteristics good handle far popular handle has very inexperrive small E-Z Just actually tight fit adult hands liked 3-l5/16-in line spacing leadout line adjustable ground inside/outside tuming equivalence Bob Hunt went step fur ther CSC Trujust handle allowed in-the-air adjustment inside/outside turning equiva nce Trujust has line spacing 43/ mainly because space handle plenty big size handwhich should have made handle much sensitive small E-Z Just However Trujust handle considerably overhang E-Z Just tended dampen sensitivity handle will examine overhang below exotic homemade handle Gene Martine Jacksonville FL constructed aluminum wood knurled thumbwheel top allows easy in-flight neutral-elevator adjustment Recently Hunt said did design handle fit hand used long overhang slow down action handle make use wrist action feels characteristics flying said setup allowed him fly nose weight airplane would make better-grooving airplane term 'overhang coined Bob Baron two separate articles about own ad justable control line handle August 1970 issue ModelAirplane News Bill Netzebands column term overhang first appeared diagrammed distance pivot point leadout wire handle rear handle grip later article adjust able handle Bob redefined overhang distance pivot point leadout wire wrist pivot point Model Aviation April 1977 So basically defining overhang talking about distance leadout pivot point leadout wire exits handle supporting point handle Baron August 1970 distance leadout pivot point pivot point hand Baron April 1977 Refer Fig clari fication Personally feel measurement GRIP WiDTH QH1 KCVEMANG C -2 LA0LJT p -J 1 iii I rOt overhang handle moment arm should leadout pivot point plane estab lished front handle grip fingers support handle Overhang Fig can deceptive because different pref erences fliers handle width Overhang B see Fig would vary greatly due different hand sizes Bobs overhang B probably accurate too variable because difference hand sizes too difficult measure future measurements will referring overhang distance leadout pivot point plane established tront handle grip Overhang C see Fig Now have beaten point death lets look overhang some common examples small E-Z Just has 1-1/16 Gene Martine version Baron handle has l-/s Hunts Trujust 2l/2 So what ask Well think important factor consider making own handle along line spacing inside/outside turning equiv alence appears longer theoverhang less sensitive handle line spacing same going build handle think should pattern after Baron/Martine type since allows adjustment three key factors Continued page 143 MAIN 8A -J N tO I LIAOLJT CADMP E- JLJ5T 8-2 3CRW OJIDE LOCI OVEWANG Ov~4A546 S WRI*T pivor OIN -I ~4RON-MTIN& Baron-Martine handle R features adjustments overhang about Wynn has much say column line spacing neutral centering leadouts center handle 70 Model Aviation Handle made Mike Ditrich 2 laminations poplar wood has stock EZ-Just leadout wire Note button back identify Up Control Line COMBAT Charlie Johnson FOR SALE Combat planes handle like camels Being bargain-hunter am couldnt pass up eight pretty decent-looking mod els bargain-basement prices Theyre nice look ing light well-builtbut dont handle very well remember former owner pretty fair luck decide must have putting lot arm flying wont wiggle turn about like stock Voodoo about 1-in differ ence between inboard outboard wings plus huge cutout plug clearance gorilla-sized hands extract same extra 1-in inboard side about inch too much makes model yaw way out turns flop around Some effective outboard lift also being destroyed large cutout around cylinder head first thing fix cutout solve problem taking some FasCal complete backing wrapping around leading edge securing FasCal Very clean just enough clearance get battery clip Well worry about changing plug blows little improvement model still slows excessively turnsactually turn because goes around once dead air Since inboard wing much longer decide add trim tab outboard tip add little area help correct minor warps first trim tab helps isnt big enough add much larger 2-in 6-in tab getting close about turbulators some masking tape turbulators outer portion out board wing might have helped stalling portion doesnt seem anything gained turbulators model has slight warp tab deflected little help correct Once model has straightened tab bent back big difference ability model quick switchbacks adjusting amount up down loops out have just enough control turn model tight possible stalling compensation does wonders model although another inch span outboard wing would have bet ter obvious trim adjustments tab should temporary cure since straight model flips much better needs tweak keep level plug access werent such problem withCombat might worth try metal skin around front cylinder some holes duct air around head upper cylin der could cleaning up front model would make big difference its top end spinner would greatly help prop efficiency too again access limited break few props Combat suppose spinner could designed clean up lines offer crashworthiness absorbing energy much done automobiles put trim tab outboard side because need additional area side inboard side preferable location because less chance pit man accidentally push tab Continued page 151 Charlie bought bunch Combat planes cheapand some Interesting times trying improve model front Above L has trim tab improved fit between engine wing leading edge about info column FasCal paper cover just pushed out way access plug fully-adjustable tailfeathers Above R show strong hinges adjustable control horn run plastic tab up down wire horn adjust total amount elevator travel set screw holds place screw heavy-duty clevis out pushrod vary difference between amount Up Down elevator travel piece tubing clevis keeps popping open hard control punched must closer look paper fairing near engine Compare section wing unmodified model above original builder lost too much lift outer wing panel huge cutout glow plug accessmade model struggle through corners Trim tab outboard wing Charlie prefers inboard tipless opportunity pit man hit used aluminum strip 1/32 plywood gluing done contact cement Warning keep unsealed wood like away wet grass tab will warp 72 Model Aviation CL Aerobatics/Paul Continued page 70 mentioned above Hunt pointed out another ideal feature Baron/Martine handle entire handle line spacing can moved up down relative pivot point wrist can substantially alter trim air plane having handicap performance adding trim weight plane instance moving Down-line tiP towards pivot point wrist will decrease amount outside turn can solve problem plane turns faster outside inside both lines can moved up down same amount give different feel handle However handles Gene Martine pro duced maximum line spacing 35/g stock overhang greater small E-Z Just handle l9/s Mar tine l-A E-Z Just found much too slow postal truck er Pampawagon want build adjustable handle has main bar see Fig 2 3 larger Martines main bar will therefore allow line spacing up 425 Ed Robbert fuel tank building fame have come up Paul/Robbert Super Handle shown Fig 2 Other components handle need some clarification guide blocks 2 main bar 3 leadout clamp 4 adjustable knobs 5 hand grip 6 leadout wire Ed Robbert advises guide blocks should made nylon Zytel acetal Delrinsee Fig 4 should cause less wear leadout cable other materials Nylon stronger acetal susceptible dimension changes due moisture temperature Brass also good material because can tapped nylon acetal cant tapped therefore must use blind nut machine screws material guide blocks must radiused no sharp edges cut leadout wire Ed advises using working drawings supplied article make tolerances close slip-fit both fully realize some will want make items home limited machining abilities main bar shown Fig 3 should made aluminum dimensions shown bar will allow line spacing up 450 Indi viduals may want alter needs leadout clamp see Fig 5 shown machined aluminum bar stock designed give tighest hold leadout wire machining tools may want make part piece aluminum brass edges bent crimped actually larger washer will probably hold leadout wire adjustable knobs see Fig 6 made aluminum shouldnt too hard make limited power tools Ed substituted knurled knob front grip ease field adjustment handle different Martine/Baron handle shown grip can made balsa ply wood core hardwood such pine pop lar nylon aluminum Some prefer contour handle expressly hand think additional material needed makes handle too heavy Keep mind small E-Z Just weighed featherweight 43 gin Martine handle 103 gin nylon grip 70 gin total weight Hunt handle whopping 114 gin think lighter handle 50-75 gin range better handle fly can get better feel airplane pulls lines handle good leadout wire Continued page iso April 1983 143 several sad stories about handles developed frayed leadout wires sub sequently broke causing demise air plane However E-Z Just thickest stranded wire 050 Martines productions f35 cable Hunts handles some very good stainless steel cable 045 Bob said recently cable handles seven strands braided cable E-Z Just handles cable somewhat stiff Hunts cable flexibility important pre cise control near future hope have some information precise type cable obtain Jim Hunt Bobs Father trying recover records CSC operation will tell what cable used loops end leadout wire handle should made just like leadout loops wings Con sult AMA rule book p 17 proper way tie ends After wrapping ends fine brass wire will want either use couple drops epoxy solder loop Some people prefer solder leadout loops because feel heat soldering gun can damage wire opinion average modeler can build handle few nights using tools normally used construct Stunt airplane have advantages machinist friend can adhere strictly dimensions presented Figure 2 Because previous dependence E-Z Just handle fliers long feel trimming variables handle lines has frequently overlooked Although Baron pointed out 1977 article has taken until demise available handles cause fliers explore variables handle/line trimming decide build own handle certain pick quality componentsthats pride joy out end lines Also information Stunt PAMPA contact Wynn Paul 1640 Mavwick Dr Lexington KY 40504 CL Scale/Boss Contirtued page 69 now ready mounting ply platform Drill appropriate hole 6-32 bolt about -in end plywood piece mount spring attach just-completed control -valve unit spring can now pull back valve body tension placed spring hold body plywood together small C-clamp spring tension can tested Using pull-test-type scale 0-25 0-50 lb scale will attached free wire loop test pull required operate valve Adjust valve position minimum 12-15 lb pull required operate valve completely position determined drill appropriate holes plywood mount valve 2-56 bolts now ready install unit models wing Referring once again December column will notice Sketch theres con siderable amount platform space behind bellcrank ideal place mounting either tOp bottom platform com pleted retract-control unit After mounting unit hook up retract special design often times required reproduce special paint design cowling tail surface go along particular color scheme artist probably can paint design model free hand average guy art department following procedure might pre vent ruining models finish Start determining exact size shape design Next make frame scrap balsa /x /4 square about er design sides Now dope piece silkspan over frame its dry water-shrink tissue would cover ing models wing tissue completely dry draw design tissue very soft lead pencil taking care tear tissue draw ing complete paint appropriate colors using several thin coats Note paint used should compatible models overall finish Using several thin coats will allow buildup paint color design completed paint thoroughly dry remove balsa frame pair scissors carefully cut out newly-made design Apply design model spreading light coat clear dope back design still wet apply model much would decal careful Use minimum amount dope point will soften design paint too much design prop erly affixed model can apply coat 150 Model Aviation certain stay away power lines flying system hoses attach appropriate leadout wire flying lines good conductors electricity thread through wing youwould belland dont want take chances flying crank leadoutyour installation now complete anywhere near power lines ready use recommend wire used information working drawings fourth line operate unit flying materials required control line handle small 015 stranded wire has worked well can contact Ed Robbert 1616 Meadowthorpe Ave. Lexington KY 40505 tel 606 253-1769 clear over design surrounding area hesitate apply design made fashion new model might good idea practice old model once twice get feel much dope required great ad vantage making special designs manner mined design does mean ruined model finish Send items CL Scale Bill Bos 77-06 269th St New Hyde Pork NY 11040 FW 190/Paul Continued page 68 front Add rudder square set aside dry Give wing assembly good sanding Apply two coats dope seal wood Sand rough spots cover wing lightweight silkspan prefer put silkspan wet allow irregular curves might exist Cover panel separately well tips Give fin ished wing light spray water set aside covering shrink wing dry begin fitting fuselage assembly helps add lot strength model fit looks good epoxy wing fuselage check squareness stress alignment lot because model built true will fly true will have strange habits flying either upright inverted After epoxy has cured give entire model five coats clear dope sanding well tween coats finish makes model come alive comes profiles Look around color scheme like try copy several books available have color plans Focke WuIf 190 colors shown plan model authentic used military flats background colors plastic tape tnstgnta trim numbers control out lines Add wheels engine propeller Hook up pushrod balance model try fly model balancing it can very tricky fly wtth wrong balance point Add whatever weight needs before head fly ing field original model flown 35-ft steel lines markedly improve As per formance over cloth Dacron lines Steel lines also much safer Flying Once field hook up con trol lines check out work Ad just handle ensure neutral control model handle neutral first few flights feel model out slowly Begin climbs dives gradually work up loops figure eights inverted flight Focke Wulfe 190 will stunts except squares difficulty Before try Combat matches suggest get well acquainted models minimum maximum turning radius will help save pulling out too late heat duel Get know 190 intimately con flying buddy building Spitfire CL Combat/Johnson Continued naoe 72 direction another fully-deflected tab would probably make interesting flight would amuse opponent least fuse 1/32-in plywood actual tabs plenty heavy can cut scissors knife Fuel-proofing optional keep unsealed wood away wet grass because neat trim tab will warp youll need tab tab Contact cement works very well securing wood aluminum wing Its about best thing Ive found hooking tabs plastic-covered wings youre doing put thin coat both surfaces allow dry can read instructions bottle wait Aluminum works real well hinge material probably about 010-in right use thinner material will bend easily thicker seems hold setting better can cut aluminum scissors easily youll notice strips like curl up after theyve cutwhich going make hard attach Take piece hardwood like motor mount run back forth across strip holding hard surface like table bench may have flip over couple times pretty soon aluminum will give up stay straight can attach no problems sure leave little room between trim tab trailing edge adjustment something can done few minutes field models always built straight can used April 1983 151
Edition: Model Aviation - 1983/04
Page Numbers: 70, 72, 143, 150, 151
Control Line AEROBA TICS Wynn Paul THE SUBJECT control line handles What can Stunters now supply E-Z Just has exhausted Bob Hunt Gene Martine no longer producing handles No manufacturer prospective manufacturer Ive talked past couple years has wanted risk liability lawsuits caused demise E-Z Just So must improvise Fox Tat Sullivan handles available fit needs Lets examine some characteristics good handle far popular handle has very inexperrive small E-Z Just actually tight fit adult hands liked 3-l5/16-in line spacing leadout line adjustable ground inside/outside tuming equivalence Bob Hunt went step fur ther CSC Trujust handle allowed in-the-air adjustment inside/outside turning equiva nce Trujust has line spacing 43/ mainly because space handle plenty big size handwhich should have made handle much sensitive small E-Z Just However Trujust handle considerably overhang E-Z Just tended dampen sensitivity handle will examine overhang below exotic homemade handle Gene Martine Jacksonville FL constructed aluminum wood knurled thumbwheel top allows easy in-flight neutral-elevator adjustment Recently Hunt said did design handle fit hand used long overhang slow down action handle make use wrist action feels characteristics flying said setup allowed him fly nose weight airplane would make better-grooving airplane term 'overhang coined Bob Baron two separate articles about own ad justable control line handle August 1970 issue ModelAirplane News Bill Netzebands column term overhang first appeared diagrammed distance pivot point leadout wire handle rear handle grip later article adjust able handle Bob redefined overhang distance pivot point leadout wire wrist pivot point Model Aviation April 1977 So basically defining overhang talking about distance leadout pivot point leadout wire exits handle supporting point handle Baron August 1970 distance leadout pivot point pivot point hand Baron April 1977 Refer Fig clari fication Personally feel measurement GRIP WiDTH QH1 KCVEMANG C -2 LA0LJT p -J 1 iii I rOt overhang handle moment arm should leadout pivot point plane estab lished front handle grip fingers support handle Overhang Fig can deceptive because different pref erences fliers handle width Overhang B see Fig would vary greatly due different hand sizes Bobs overhang B probably accurate too variable because difference hand sizes too difficult measure future measurements will referring overhang distance leadout pivot point plane established tront handle grip Overhang C see Fig Now have beaten point death lets look overhang some common examples small E-Z Just has 1-1/16 Gene Martine version Baron handle has l-/s Hunts Trujust 2l/2 So what ask Well think important factor consider making own handle along line spacing inside/outside turning equiv alence appears longer theoverhang less sensitive handle line spacing same going build handle think should pattern after Baron/Martine type since allows adjustment three key factors Continued page 143 MAIN 8A -J N tO I LIAOLJT CADMP E- JLJ5T 8-2 3CRW OJIDE LOCI OVEWANG Ov~4A546 S WRI*T pivor OIN -I ~4RON-MTIN& Baron-Martine handle R features adjustments overhang about Wynn has much say column line spacing neutral centering leadouts center handle 70 Model Aviation Handle made Mike Ditrich 2 laminations poplar wood has stock EZ-Just leadout wire Note button back identify Up Control Line COMBAT Charlie Johnson FOR SALE Combat planes handle like camels Being bargain-hunter am couldnt pass up eight pretty decent-looking mod els bargain-basement prices Theyre nice look ing light well-builtbut dont handle very well remember former owner pretty fair luck decide must have putting lot arm flying wont wiggle turn about like stock Voodoo about 1-in differ ence between inboard outboard wings plus huge cutout plug clearance gorilla-sized hands extract same extra 1-in inboard side about inch too much makes model yaw way out turns flop around Some effective outboard lift also being destroyed large cutout around cylinder head first thing fix cutout solve problem taking some FasCal complete backing wrapping around leading edge securing FasCal Very clean just enough clearance get battery clip Well worry about changing plug blows little improvement model still slows excessively turnsactually turn because goes around once dead air Since inboard wing much longer decide add trim tab outboard tip add little area help correct minor warps first trim tab helps isnt big enough add much larger 2-in 6-in tab getting close about turbulators some masking tape turbulators outer portion out board wing might have helped stalling portion doesnt seem anything gained turbulators model has slight warp tab deflected little help correct Once model has straightened tab bent back big difference ability model quick switchbacks adjusting amount up down loops out have just enough control turn model tight possible stalling compensation does wonders model although another inch span outboard wing would have bet ter obvious trim adjustments tab should temporary cure since straight model flips much better needs tweak keep level plug access werent such problem withCombat might worth try metal skin around front cylinder some holes duct air around head upper cylin der could cleaning up front model would make big difference its top end spinner would greatly help prop efficiency too again access limited break few props Combat suppose spinner could designed clean up lines offer crashworthiness absorbing energy much done automobiles put trim tab outboard side because need additional area side inboard side preferable location because less chance pit man accidentally push tab Continued page 151 Charlie bought bunch Combat planes cheapand some Interesting times trying improve model front Above L has trim tab improved fit between engine wing leading edge about info column FasCal paper cover just pushed out way access plug fully-adjustable tailfeathers Above R show strong hinges adjustable control horn run plastic tab up down wire horn adjust total amount elevator travel set screw holds place screw heavy-duty clevis out pushrod vary difference between amount Up Down elevator travel piece tubing clevis keeps popping open hard control punched must closer look paper fairing near engine Compare section wing unmodified model above original builder lost too much lift outer wing panel huge cutout glow plug accessmade model struggle through corners Trim tab outboard wing Charlie prefers inboard tipless opportunity pit man hit used aluminum strip 1/32 plywood gluing done contact cement Warning keep unsealed wood like away wet grass tab will warp 72 Model Aviation CL Aerobatics/Paul Continued page 70 mentioned above Hunt pointed out another ideal feature Baron/Martine handle entire handle line spacing can moved up down relative pivot point wrist can substantially alter trim air plane having handicap performance adding trim weight plane instance moving Down-line tiP towards pivot point wrist will decrease amount outside turn can solve problem plane turns faster outside inside both lines can moved up down same amount give different feel handle However handles Gene Martine pro duced maximum line spacing 35/g stock overhang greater small E-Z Just handle l9/s Mar tine l-A E-Z Just found much too slow postal truck er Pampawagon want build adjustable handle has main bar see Fig 2 3 larger Martines main bar will therefore allow line spacing up 425 Ed Robbert fuel tank building fame have come up Paul/Robbert Super Handle shown Fig 2 Other components handle need some clarification guide blocks 2 main bar 3 leadout clamp 4 adjustable knobs 5 hand grip 6 leadout wire Ed Robbert advises guide blocks should made nylon Zytel acetal Delrinsee Fig 4 should cause less wear leadout cable other materials Nylon stronger acetal susceptible dimension changes due moisture temperature Brass also good material because can tapped nylon acetal cant tapped therefore must use blind nut machine screws material guide blocks must radiused no sharp edges cut leadout wire Ed advises using working drawings supplied article make tolerances close slip-fit both fully realize some will want make items home limited machining abilities main bar shown Fig 3 should made aluminum dimensions shown bar will allow line spacing up 450 Indi viduals may want alter needs leadout clamp see Fig 5 shown machined aluminum bar stock designed give tighest hold leadout wire machining tools may want make part piece aluminum brass edges bent crimped actually larger washer will probably hold leadout wire adjustable knobs see Fig 6 made aluminum shouldnt too hard make limited power tools Ed substituted knurled knob front grip ease field adjustment handle different Martine/Baron handle shown grip can made balsa ply wood core hardwood such pine pop lar nylon aluminum Some prefer contour handle expressly hand think additional material needed makes handle too heavy Keep mind small E-Z Just weighed featherweight 43 gin Martine handle 103 gin nylon grip 70 gin total weight Hunt handle whopping 114 gin think lighter handle 50-75 gin range better handle fly can get better feel airplane pulls lines handle good leadout wire Continued page iso April 1983 143 several sad stories about handles developed frayed leadout wires sub sequently broke causing demise air plane However E-Z Just thickest stranded wire 050 Martines productions f35 cable Hunts handles some very good stainless steel cable 045 Bob said recently cable handles seven strands braided cable E-Z Just handles cable somewhat stiff Hunts cable flexibility important pre cise control near future hope have some information precise type cable obtain Jim Hunt Bobs Father trying recover records CSC operation will tell what cable used loops end leadout wire handle should made just like leadout loops wings Con sult AMA rule book p 17 proper way tie ends After wrapping ends fine brass wire will want either use couple drops epoxy solder loop Some people prefer solder leadout loops because feel heat soldering gun can damage wire opinion average modeler can build handle few nights using tools normally used construct Stunt airplane have advantages machinist friend can adhere strictly dimensions presented Figure 2 Because previous dependence E-Z Just handle fliers long feel trimming variables handle lines has frequently overlooked Although Baron pointed out 1977 article has taken until demise available handles cause fliers explore variables handle/line trimming decide build own handle certain pick quality componentsthats pride joy out end lines Also information Stunt PAMPA contact Wynn Paul 1640 Mavwick Dr Lexington KY 40504 CL Scale/Boss Contirtued page 69 now ready mounting ply platform Drill appropriate hole 6-32 bolt about -in end plywood piece mount spring attach just-completed control -valve unit spring can now pull back valve body tension placed spring hold body plywood together small C-clamp spring tension can tested Using pull-test-type scale 0-25 0-50 lb scale will attached free wire loop test pull required operate valve Adjust valve position minimum 12-15 lb pull required operate valve completely position determined drill appropriate holes plywood mount valve 2-56 bolts now ready install unit models wing Referring once again December column will notice Sketch theres con siderable amount platform space behind bellcrank ideal place mounting either tOp bottom platform com pleted retract-control unit After mounting unit hook up retract special design often times required reproduce special paint design cowling tail surface go along particular color scheme artist probably can paint design model free hand average guy art department following procedure might pre vent ruining models finish Start determining exact size shape design Next make frame scrap balsa /x /4 square about er design sides Now dope piece silkspan over frame its dry water-shrink tissue would cover ing models wing tissue completely dry draw design tissue very soft lead pencil taking care tear tissue draw ing complete paint appropriate colors using several thin coats Note paint used should compatible models overall finish Using several thin coats will allow buildup paint color design completed paint thoroughly dry remove balsa frame pair scissors carefully cut out newly-made design Apply design model spreading light coat clear dope back design still wet apply model much would decal careful Use minimum amount dope point will soften design paint too much design prop erly affixed model can apply coat 150 Model Aviation certain stay away power lines flying system hoses attach appropriate leadout wire flying lines good conductors electricity thread through wing youwould belland dont want take chances flying crank leadoutyour installation now complete anywhere near power lines ready use recommend wire used information working drawings fourth line operate unit flying materials required control line handle small 015 stranded wire has worked well can contact Ed Robbert 1616 Meadowthorpe Ave. Lexington KY 40505 tel 606 253-1769 clear over design surrounding area hesitate apply design made fashion new model might good idea practice old model once twice get feel much dope required great ad vantage making special designs manner mined design does mean ruined model finish Send items CL Scale Bill Bos 77-06 269th St New Hyde Pork NY 11040 FW 190/Paul Continued page 68 front Add rudder square set aside dry Give wing assembly good sanding Apply two coats dope seal wood Sand rough spots cover wing lightweight silkspan prefer put silkspan wet allow irregular curves might exist Cover panel separately well tips Give fin ished wing light spray water set aside covering shrink wing dry begin fitting fuselage assembly helps add lot strength model fit looks good epoxy wing fuselage check squareness stress alignment lot because model built true will fly true will have strange habits flying either upright inverted After epoxy has cured give entire model five coats clear dope sanding well tween coats finish makes model come alive comes profiles Look around color scheme like try copy several books available have color plans Focke WuIf 190 colors shown plan model authentic used military flats background colors plastic tape tnstgnta trim numbers control out lines Add wheels engine propeller Hook up pushrod balance model try fly model balancing it can very tricky fly wtth wrong balance point Add whatever weight needs before head fly ing field original model flown 35-ft steel lines markedly improve As per formance over cloth Dacron lines Steel lines also much safer Flying Once field hook up con trol lines check out work Ad just handle ensure neutral control model handle neutral first few flights feel model out slowly Begin climbs dives gradually work up loops figure eights inverted flight Focke Wulfe 190 will stunts except squares difficulty Before try Combat matches suggest get well acquainted models minimum maximum turning radius will help save pulling out too late heat duel Get know 190 intimately con flying buddy building Spitfire CL Combat/Johnson Continued naoe 72 direction another fully-deflected tab would probably make interesting flight would amuse opponent least fuse 1/32-in plywood actual tabs plenty heavy can cut scissors knife Fuel-proofing optional keep unsealed wood away wet grass because neat trim tab will warp youll need tab tab Contact cement works very well securing wood aluminum wing Its about best thing Ive found hooking tabs plastic-covered wings youre doing put thin coat both surfaces allow dry can read instructions bottle wait Aluminum works real well hinge material probably about 010-in right use thinner material will bend easily thicker seems hold setting better can cut aluminum scissors easily youll notice strips like curl up after theyve cutwhich going make hard attach Take piece hardwood like motor mount run back forth across strip holding hard surface like table bench may have flip over couple times pretty soon aluminum will give up stay straight can attach no problems sure leave little room between trim tab trailing edge adjustment something can done few minutes field models always built straight can used April 1983 151
Edition: Model Aviation - 1983/04
Page Numbers: 70, 72, 143, 150, 151
Control Line AEROBA TICS Wynn Paul THE SUBJECT control line handles What can Stunters now supply E-Z Just has exhausted Bob Hunt Gene Martine no longer producing handles No manufacturer prospective manufacturer Ive talked past couple years has wanted risk liability lawsuits caused demise E-Z Just So must improvise Fox Tat Sullivan handles available fit needs Lets examine some characteristics good handle far popular handle has very inexperrive small E-Z Just actually tight fit adult hands liked 3-l5/16-in line spacing leadout line adjustable ground inside/outside tuming equivalence Bob Hunt went step fur ther CSC Trujust handle allowed in-the-air adjustment inside/outside turning equiva nce Trujust has line spacing 43/ mainly because space handle plenty big size handwhich should have made handle much sensitive small E-Z Just However Trujust handle considerably overhang E-Z Just tended dampen sensitivity handle will examine overhang below exotic homemade handle Gene Martine Jacksonville FL constructed aluminum wood knurled thumbwheel top allows easy in-flight neutral-elevator adjustment Recently Hunt said did design handle fit hand used long overhang slow down action handle make use wrist action feels characteristics flying said setup allowed him fly nose weight airplane would make better-grooving airplane term 'overhang coined Bob Baron two separate articles about own ad justable control line handle August 1970 issue ModelAirplane News Bill Netzebands column term overhang first appeared diagrammed distance pivot point leadout wire handle rear handle grip later article adjust able handle Bob redefined overhang distance pivot point leadout wire wrist pivot point Model Aviation April 1977 So basically defining overhang talking about distance leadout pivot point leadout wire exits handle supporting point handle Baron August 1970 distance leadout pivot point pivot point hand Baron April 1977 Refer Fig clari fication Personally feel measurement GRIP WiDTH QH1 KCVEMANG C -2 LA0LJT p -J 1 iii I rOt overhang handle moment arm should leadout pivot point plane estab lished front handle grip fingers support handle Overhang Fig can deceptive because different pref erences fliers handle width Overhang B see Fig would vary greatly due different hand sizes Bobs overhang B probably accurate too variable because difference hand sizes too difficult measure future measurements will referring overhang distance leadout pivot point plane established tront handle grip Overhang C see Fig Now have beaten point death lets look overhang some common examples small E-Z Just has 1-1/16 Gene Martine version Baron handle has l-/s Hunts Trujust 2l/2 So what ask Well think important factor consider making own handle along line spacing inside/outside turning equiv alence appears longer theoverhang less sensitive handle line spacing same going build handle think should pattern after Baron/Martine type since allows adjustment three key factors Continued page 143 MAIN 8A -J N tO I LIAOLJT CADMP E- JLJ5T 8-2 3CRW OJIDE LOCI OVEWANG Ov~4A546 S WRI*T pivor OIN -I ~4RON-MTIN& Baron-Martine handle R features adjustments overhang about Wynn has much say column line spacing neutral centering leadouts center handle 70 Model Aviation Handle made Mike Ditrich 2 laminations poplar wood has stock EZ-Just leadout wire Note button back identify Up Control Line COMBAT Charlie Johnson FOR SALE Combat planes handle like camels Being bargain-hunter am couldnt pass up eight pretty decent-looking mod els bargain-basement prices Theyre nice look ing light well-builtbut dont handle very well remember former owner pretty fair luck decide must have putting lot arm flying wont wiggle turn about like stock Voodoo about 1-in differ ence between inboard outboard wings plus huge cutout plug clearance gorilla-sized hands extract same extra 1-in inboard side about inch too much makes model yaw way out turns flop around Some effective outboard lift also being destroyed large cutout around cylinder head first thing fix cutout solve problem taking some FasCal complete backing wrapping around leading edge securing FasCal Very clean just enough clearance get battery clip Well worry about changing plug blows little improvement model still slows excessively turnsactually turn because goes around once dead air Since inboard wing much longer decide add trim tab outboard tip add little area help correct minor warps first trim tab helps isnt big enough add much larger 2-in 6-in tab getting close about turbulators some masking tape turbulators outer portion out board wing might have helped stalling portion doesnt seem anything gained turbulators model has slight warp tab deflected little help correct Once model has straightened tab bent back big difference ability model quick switchbacks adjusting amount up down loops out have just enough control turn model tight possible stalling compensation does wonders model although another inch span outboard wing would have bet ter obvious trim adjustments tab should temporary cure since straight model flips much better needs tweak keep level plug access werent such problem withCombat might worth try metal skin around front cylinder some holes duct air around head upper cylin der could cleaning up front model would make big difference its top end spinner would greatly help prop efficiency too again access limited break few props Combat suppose spinner could designed clean up lines offer crashworthiness absorbing energy much done automobiles put trim tab outboard side because need additional area side inboard side preferable location because less chance pit man accidentally push tab Continued page 151 Charlie bought bunch Combat planes cheapand some Interesting times trying improve model front Above L has trim tab improved fit between engine wing leading edge about info column FasCal paper cover just pushed out way access plug fully-adjustable tailfeathers Above R show strong hinges adjustable control horn run plastic tab up down wire horn adjust total amount elevator travel set screw holds place screw heavy-duty clevis out pushrod vary difference between amount Up Down elevator travel piece tubing clevis keeps popping open hard control punched must closer look paper fairing near engine Compare section wing unmodified model above original builder lost too much lift outer wing panel huge cutout glow plug accessmade model struggle through corners Trim tab outboard wing Charlie prefers inboard tipless opportunity pit man hit used aluminum strip 1/32 plywood gluing done contact cement Warning keep unsealed wood like away wet grass tab will warp 72 Model Aviation CL Aerobatics/Paul Continued page 70 mentioned above Hunt pointed out another ideal feature Baron/Martine handle entire handle line spacing can moved up down relative pivot point wrist can substantially alter trim air plane having handicap performance adding trim weight plane instance moving Down-line tiP towards pivot point wrist will decrease amount outside turn can solve problem plane turns faster outside inside both lines can moved up down same amount give different feel handle However handles Gene Martine pro duced maximum line spacing 35/g stock overhang greater small E-Z Just handle l9/s Mar tine l-A E-Z Just found much too slow postal truck er Pampawagon want build adjustable handle has main bar see Fig 2 3 larger Martines main bar will therefore allow line spacing up 425 Ed Robbert fuel tank building fame have come up Paul/Robbert Super Handle shown Fig 2 Other components handle need some clarification guide blocks 2 main bar 3 leadout clamp 4 adjustable knobs 5 hand grip 6 leadout wire Ed Robbert advises guide blocks should made nylon Zytel acetal Delrinsee Fig 4 should cause less wear leadout cable other materials Nylon stronger acetal susceptible dimension changes due moisture temperature Brass also good material because can tapped nylon acetal cant tapped therefore must use blind nut machine screws material guide blocks must radiused no sharp edges cut leadout wire Ed advises using working drawings supplied article make tolerances close slip-fit both fully realize some will want make items home limited machining abilities main bar shown Fig 3 should made aluminum dimensions shown bar will allow line spacing up 450 Indi viduals may want alter needs leadout clamp see Fig 5 shown machined aluminum bar stock designed give tighest hold leadout wire machining tools may want make part piece aluminum brass edges bent crimped actually larger washer will probably hold leadout wire adjustable knobs see Fig 6 made aluminum shouldnt too hard make limited power tools Ed substituted knurled knob front grip ease field adjustment handle different Martine/Baron handle shown grip can made balsa ply wood core hardwood such pine pop lar nylon aluminum Some prefer contour handle expressly hand think additional material needed makes handle too heavy Keep mind small E-Z Just weighed featherweight 43 gin Martine handle 103 gin nylon grip 70 gin total weight Hunt handle whopping 114 gin think lighter handle 50-75 gin range better handle fly can get better feel airplane pulls lines handle good leadout wire Continued page iso April 1983 143 several sad stories about handles developed frayed leadout wires sub sequently broke causing demise air plane However E-Z Just thickest stranded wire 050 Martines productions f35 cable Hunts handles some very good stainless steel cable 045 Bob said recently cable handles seven strands braided cable E-Z Just handles cable somewhat stiff Hunts cable flexibility important pre cise control near future hope have some information precise type cable obtain Jim Hunt Bobs Father trying recover records CSC operation will tell what cable used loops end leadout wire handle should made just like leadout loops wings Con sult AMA rule book p 17 proper way tie ends After wrapping ends fine brass wire will want either use couple drops epoxy solder loop Some people prefer solder leadout loops because feel heat soldering gun can damage wire opinion average modeler can build handle few nights using tools normally used construct Stunt airplane have advantages machinist friend can adhere strictly dimensions presented Figure 2 Because previous dependence E-Z Just handle fliers long feel trimming variables handle lines has frequently overlooked Although Baron pointed out 1977 article has taken until demise available handles cause fliers explore variables handle/line trimming decide build own handle certain pick quality componentsthats pride joy out end lines Also information Stunt PAMPA contact Wynn Paul 1640 Mavwick Dr Lexington KY 40504 CL Scale/Boss Contirtued page 69 now ready mounting ply platform Drill appropriate hole 6-32 bolt about -in end plywood piece mount spring attach just-completed control -valve unit spring can now pull back valve body tension placed spring hold body plywood together small C-clamp spring tension can tested Using pull-test-type scale 0-25 0-50 lb scale will attached free wire loop test pull required operate valve Adjust valve position minimum 12-15 lb pull required operate valve completely position determined drill appropriate holes plywood mount valve 2-56 bolts now ready install unit models wing Referring once again December column will notice Sketch theres con siderable amount platform space behind bellcrank ideal place mounting either tOp bottom platform com pleted retract-control unit After mounting unit hook up retract special design often times required reproduce special paint design cowling tail surface go along particular color scheme artist probably can paint design model free hand average guy art department following procedure might pre vent ruining models finish Start determining exact size shape design Next make frame scrap balsa /x /4 square about er design sides Now dope piece silkspan over frame its dry water-shrink tissue would cover ing models wing tissue completely dry draw design tissue very soft lead pencil taking care tear tissue draw ing complete paint appropriate colors using several thin coats Note paint used should compatible models overall finish Using several thin coats will allow buildup paint color design completed paint thoroughly dry remove balsa frame pair scissors carefully cut out newly-made design Apply design model spreading light coat clear dope back design still wet apply model much would decal careful Use minimum amount dope point will soften design paint too much design prop erly affixed model can apply coat 150 Model Aviation certain stay away power lines flying system hoses attach appropriate leadout wire flying lines good conductors electricity thread through wing youwould belland dont want take chances flying crank leadoutyour installation now complete anywhere near power lines ready use recommend wire used information working drawings fourth line operate unit flying materials required control line handle small 015 stranded wire has worked well can contact Ed Robbert 1616 Meadowthorpe Ave. Lexington KY 40505 tel 606 253-1769 clear over design surrounding area hesitate apply design made fashion new model might good idea practice old model once twice get feel much dope required great ad vantage making special designs manner mined design does mean ruined model finish Send items CL Scale Bill Bos 77-06 269th St New Hyde Pork NY 11040 FW 190/Paul Continued page 68 front Add rudder square set aside dry Give wing assembly good sanding Apply two coats dope seal wood Sand rough spots cover wing lightweight silkspan prefer put silkspan wet allow irregular curves might exist Cover panel separately well tips Give fin ished wing light spray water set aside covering shrink wing dry begin fitting fuselage assembly helps add lot strength model fit looks good epoxy wing fuselage check squareness stress alignment lot because model built true will fly true will have strange habits flying either upright inverted After epoxy has cured give entire model five coats clear dope sanding well tween coats finish makes model come alive comes profiles Look around color scheme like try copy several books available have color plans Focke WuIf 190 colors shown plan model authentic used military flats background colors plastic tape tnstgnta trim numbers control out lines Add wheels engine propeller Hook up pushrod balance model try fly model balancing it can very tricky fly wtth wrong balance point Add whatever weight needs before head fly ing field original model flown 35-ft steel lines markedly improve As per formance over cloth Dacron lines Steel lines also much safer Flying Once field hook up con trol lines check out work Ad just handle ensure neutral control model handle neutral first few flights feel model out slowly Begin climbs dives gradually work up loops figure eights inverted flight Focke Wulfe 190 will stunts except squares difficulty Before try Combat matches suggest get well acquainted models minimum maximum turning radius will help save pulling out too late heat duel Get know 190 intimately con flying buddy building Spitfire CL Combat/Johnson Continued naoe 72 direction another fully-deflected tab would probably make interesting flight would amuse opponent least fuse 1/32-in plywood actual tabs plenty heavy can cut scissors knife Fuel-proofing optional keep unsealed wood away wet grass because neat trim tab will warp youll need tab tab Contact cement works very well securing wood aluminum wing Its about best thing Ive found hooking tabs plastic-covered wings youre doing put thin coat both surfaces allow dry can read instructions bottle wait Aluminum works real well hinge material probably about 010-in right use thinner material will bend easily thicker seems hold setting better can cut aluminum scissors easily youll notice strips like curl up after theyve cutwhich going make hard attach Take piece hardwood like motor mount run back forth across strip holding hard surface like table bench may have flip over couple times pretty soon aluminum will give up stay straight can attach no problems sure leave little room between trim tab trailing edge adjustment something can done few minutes field models always built straight can used April 1983 151
Edition: Model Aviation - 1983/04
Page Numbers: 70, 72, 143, 150, 151
Control Line AEROBA TICS Wynn Paul THE SUBJECT control line handles What can Stunters now supply E-Z Just has exhausted Bob Hunt Gene Martine no longer producing handles No manufacturer prospective manufacturer Ive talked past couple years has wanted risk liability lawsuits caused demise E-Z Just So must improvise Fox Tat Sullivan handles available fit needs Lets examine some characteristics good handle far popular handle has very inexperrive small E-Z Just actually tight fit adult hands liked 3-l5/16-in line spacing leadout line adjustable ground inside/outside tuming equivalence Bob Hunt went step fur ther CSC Trujust handle allowed in-the-air adjustment inside/outside turning equiva nce Trujust has line spacing 43/ mainly because space handle plenty big size handwhich should have made handle much sensitive small E-Z Just However Trujust handle considerably overhang E-Z Just tended dampen sensitivity handle will examine overhang below exotic homemade handle Gene Martine Jacksonville FL constructed aluminum wood knurled thumbwheel top allows easy in-flight neutral-elevator adjustment Recently Hunt said did design handle fit hand used long overhang slow down action handle make use wrist action feels characteristics flying said setup allowed him fly nose weight airplane would make better-grooving airplane term 'overhang coined Bob Baron two separate articles about own ad justable control line handle August 1970 issue ModelAirplane News Bill Netzebands column term overhang first appeared diagrammed distance pivot point leadout wire handle rear handle grip later article adjust able handle Bob redefined overhang distance pivot point leadout wire wrist pivot point Model Aviation April 1977 So basically defining overhang talking about distance leadout pivot point leadout wire exits handle supporting point handle Baron August 1970 distance leadout pivot point pivot point hand Baron April 1977 Refer Fig clari fication Personally feel measurement GRIP WiDTH QH1 KCVEMANG C -2 LA0LJT p -J 1 iii I rOt overhang handle moment arm should leadout pivot point plane estab lished front handle grip fingers support handle Overhang Fig can deceptive because different pref erences fliers handle width Overhang B see Fig would vary greatly due different hand sizes Bobs overhang B probably accurate too variable because difference hand sizes too difficult measure future measurements will referring overhang distance leadout pivot point plane established tront handle grip Overhang C see Fig Now have beaten point death lets look overhang some common examples small E-Z Just has 1-1/16 Gene Martine version Baron handle has l-/s Hunts Trujust 2l/2 So what ask Well think important factor consider making own handle along line spacing inside/outside turning equiv alence appears longer theoverhang less sensitive handle line spacing same going build handle think should pattern after Baron/Martine type since allows adjustment three key factors Continued page 143 MAIN 8A -J N tO I LIAOLJT CADMP E- JLJ5T 8-2 3CRW OJIDE LOCI OVEWANG Ov~4A546 S WRI*T pivor OIN -I ~4RON-MTIN& Baron-Martine handle R features adjustments overhang about Wynn has much say column line spacing neutral centering leadouts center handle 70 Model Aviation Handle made Mike Ditrich 2 laminations poplar wood has stock EZ-Just leadout wire Note button back identify Up Control Line COMBAT Charlie Johnson FOR SALE Combat planes handle like camels Being bargain-hunter am couldnt pass up eight pretty decent-looking mod els bargain-basement prices Theyre nice look ing light well-builtbut dont handle very well remember former owner pretty fair luck decide must have putting lot arm flying wont wiggle turn about like stock Voodoo about 1-in differ ence between inboard outboard wings plus huge cutout plug clearance gorilla-sized hands extract same extra 1-in inboard side about inch too much makes model yaw way out turns flop around Some effective outboard lift also being destroyed large cutout around cylinder head first thing fix cutout solve problem taking some FasCal complete backing wrapping around leading edge securing FasCal Very clean just enough clearance get battery clip Well worry about changing plug blows little improvement model still slows excessively turnsactually turn because goes around once dead air Since inboard wing much longer decide add trim tab outboard tip add little area help correct minor warps first trim tab helps isnt big enough add much larger 2-in 6-in tab getting close about turbulators some masking tape turbulators outer portion out board wing might have helped stalling portion doesnt seem anything gained turbulators model has slight warp tab deflected little help correct Once model has straightened tab bent back big difference ability model quick switchbacks adjusting amount up down loops out have just enough control turn model tight possible stalling compensation does wonders model although another inch span outboard wing would have bet ter obvious trim adjustments tab should temporary cure since straight model flips much better needs tweak keep level plug access werent such problem withCombat might worth try metal skin around front cylinder some holes duct air around head upper cylin der could cleaning up front model would make big difference its top end spinner would greatly help prop efficiency too again access limited break few props Combat suppose spinner could designed clean up lines offer crashworthiness absorbing energy much done automobiles put trim tab outboard side because need additional area side inboard side preferable location because less chance pit man accidentally push tab Continued page 151 Charlie bought bunch Combat planes cheapand some Interesting times trying improve model front Above L has trim tab improved fit between engine wing leading edge about info column FasCal paper cover just pushed out way access plug fully-adjustable tailfeathers Above R show strong hinges adjustable control horn run plastic tab up down wire horn adjust total amount elevator travel set screw holds place screw heavy-duty clevis out pushrod vary difference between amount Up Down elevator travel piece tubing clevis keeps popping open hard control punched must closer look paper fairing near engine Compare section wing unmodified model above original builder lost too much lift outer wing panel huge cutout glow plug accessmade model struggle through corners Trim tab outboard wing Charlie prefers inboard tipless opportunity pit man hit used aluminum strip 1/32 plywood gluing done contact cement Warning keep unsealed wood like away wet grass tab will warp 72 Model Aviation CL Aerobatics/Paul Continued page 70 mentioned above Hunt pointed out another ideal feature Baron/Martine handle entire handle line spacing can moved up down relative pivot point wrist can substantially alter trim air plane having handicap performance adding trim weight plane instance moving Down-line tiP towards pivot point wrist will decrease amount outside turn can solve problem plane turns faster outside inside both lines can moved up down same amount give different feel handle However handles Gene Martine pro duced maximum line spacing 35/g stock overhang greater small E-Z Just handle l9/s Mar tine l-A E-Z Just found much too slow postal truck er Pampawagon want build adjustable handle has main bar see Fig 2 3 larger Martines main bar will therefore allow line spacing up 425 Ed Robbert fuel tank building fame have come up Paul/Robbert Super Handle shown Fig 2 Other components handle need some clarification guide blocks 2 main bar 3 leadout clamp 4 adjustable knobs 5 hand grip 6 leadout wire Ed Robbert advises guide blocks should made nylon Zytel acetal Delrinsee Fig 4 should cause less wear leadout cable other materials Nylon stronger acetal susceptible dimension changes due moisture temperature Brass also good material because can tapped nylon acetal cant tapped therefore must use blind nut machine screws material guide blocks must radiused no sharp edges cut leadout wire Ed advises using working drawings supplied article make tolerances close slip-fit both fully realize some will want make items home limited machining abilities main bar shown Fig 3 should made aluminum dimensions shown bar will allow line spacing up 450 Indi viduals may want alter needs leadout clamp see Fig 5 shown machined aluminum bar stock designed give tighest hold leadout wire machining tools may want make part piece aluminum brass edges bent crimped actually larger washer will probably hold leadout wire adjustable knobs see Fig 6 made aluminum shouldnt too hard make limited power tools Ed substituted knurled knob front grip ease field adjustment handle different Martine/Baron handle shown grip can made balsa ply wood core hardwood such pine pop lar nylon aluminum Some prefer contour handle expressly hand think additional material needed makes handle too heavy Keep mind small E-Z Just weighed featherweight 43 gin Martine handle 103 gin nylon grip 70 gin total weight Hunt handle whopping 114 gin think lighter handle 50-75 gin range better handle fly can get better feel airplane pulls lines handle good leadout wire Continued page iso April 1983 143 several sad stories about handles developed frayed leadout wires sub sequently broke causing demise air plane However E-Z Just thickest stranded wire 050 Martines productions f35 cable Hunts handles some very good stainless steel cable 045 Bob said recently cable handles seven strands braided cable E-Z Just handles cable somewhat stiff Hunts cable flexibility important pre cise control near future hope have some information precise type cable obtain Jim Hunt Bobs Father trying recover records CSC operation will tell what cable used loops end leadout wire handle should made just like leadout loops wings Con sult AMA rule book p 17 proper way tie ends After wrapping ends fine brass wire will want either use couple drops epoxy solder loop Some people prefer solder leadout loops because feel heat soldering gun can damage wire opinion average modeler can build handle few nights using tools normally used construct Stunt airplane have advantages machinist friend can adhere strictly dimensions presented Figure 2 Because previous dependence E-Z Just handle fliers long feel trimming variables handle lines has frequently overlooked Although Baron pointed out 1977 article has taken until demise available handles cause fliers explore variables handle/line trimming decide build own handle certain pick quality componentsthats pride joy out end lines Also information Stunt PAMPA contact Wynn Paul 1640 Mavwick Dr Lexington KY 40504 CL Scale/Boss Contirtued page 69 now ready mounting ply platform Drill appropriate hole 6-32 bolt about -in end plywood piece mount spring attach just-completed control -valve unit spring can now pull back valve body tension placed spring hold body plywood together small C-clamp spring tension can tested Using pull-test-type scale 0-25 0-50 lb scale will attached free wire loop test pull required operate valve Adjust valve position minimum 12-15 lb pull required operate valve completely position determined drill appropriate holes plywood mount valve 2-56 bolts now ready install unit models wing Referring once again December column will notice Sketch theres con siderable amount platform space behind bellcrank ideal place mounting either tOp bottom platform com pleted retract-control unit After mounting unit hook up retract special design often times required reproduce special paint design cowling tail surface go along particular color scheme artist probably can paint design model free hand average guy art department following procedure might pre vent ruining models finish Start determining exact size shape design Next make frame scrap balsa /x /4 square about er design sides Now dope piece silkspan over frame its dry water-shrink tissue would cover ing models wing tissue completely dry draw design tissue very soft lead pencil taking care tear tissue draw ing complete paint appropriate colors using several thin coats Note paint used should compatible models overall finish Using several thin coats will allow buildup paint color design completed paint thoroughly dry remove balsa frame pair scissors carefully cut out newly-made design Apply design model spreading light coat clear dope back design still wet apply model much would decal careful Use minimum amount dope point will soften design paint too much design prop erly affixed model can apply coat 150 Model Aviation certain stay away power lines flying system hoses attach appropriate leadout wire flying lines good conductors electricity thread through wing youwould belland dont want take chances flying crank leadoutyour installation now complete anywhere near power lines ready use recommend wire used information working drawings fourth line operate unit flying materials required control line handle small 015 stranded wire has worked well can contact Ed Robbert 1616 Meadowthorpe Ave. Lexington KY 40505 tel 606 253-1769 clear over design surrounding area hesitate apply design made fashion new model might good idea practice old model once twice get feel much dope required great ad vantage making special designs manner mined design does mean ruined model finish Send items CL Scale Bill Bos 77-06 269th St New Hyde Pork NY 11040 FW 190/Paul Continued page 68 front Add rudder square set aside dry Give wing assembly good sanding Apply two coats dope seal wood Sand rough spots cover wing lightweight silkspan prefer put silkspan wet allow irregular curves might exist Cover panel separately well tips Give fin ished wing light spray water set aside covering shrink wing dry begin fitting fuselage assembly helps add lot strength model fit looks good epoxy wing fuselage check squareness stress alignment lot because model built true will fly true will have strange habits flying either upright inverted After epoxy has cured give entire model five coats clear dope sanding well tween coats finish makes model come alive comes profiles Look around color scheme like try copy several books available have color plans Focke WuIf 190 colors shown plan model authentic used military flats background colors plastic tape tnstgnta trim numbers control out lines Add wheels engine propeller Hook up pushrod balance model try fly model balancing it can very tricky fly wtth wrong balance point Add whatever weight needs before head fly ing field original model flown 35-ft steel lines markedly improve As per formance over cloth Dacron lines Steel lines also much safer Flying Once field hook up con trol lines check out work Ad just handle ensure neutral control model handle neutral first few flights feel model out slowly Begin climbs dives gradually work up loops figure eights inverted flight Focke Wulfe 190 will stunts except squares difficulty Before try Combat matches suggest get well acquainted models minimum maximum turning radius will help save pulling out too late heat duel Get know 190 intimately con flying buddy building Spitfire CL Combat/Johnson Continued naoe 72 direction another fully-deflected tab would probably make interesting flight would amuse opponent least fuse 1/32-in plywood actual tabs plenty heavy can cut scissors knife Fuel-proofing optional keep unsealed wood away wet grass because neat trim tab will warp youll need tab tab Contact cement works very well securing wood aluminum wing Its about best thing Ive found hooking tabs plastic-covered wings youre doing put thin coat both surfaces allow dry can read instructions bottle wait Aluminum works real well hinge material probably about 010-in right use thinner material will bend easily thicker seems hold setting better can cut aluminum scissors easily youll notice strips like curl up after theyve cutwhich going make hard attach Take piece hardwood like motor mount run back forth across strip holding hard surface like table bench may have flip over couple times pretty soon aluminum will give up stay straight can attach no problems sure leave little room between trim tab trailing edge adjustment something can done few minutes field models always built straight can used April 1983 151
Edition: Model Aviation - 1983/04
Page Numbers: 70, 72, 143, 150, 151
Control Line AEROBA TICS Wynn Paul THE SUBJECT control line handles What can Stunters now supply E-Z Just has exhausted Bob Hunt Gene Martine no longer producing handles No manufacturer prospective manufacturer Ive talked past couple years has wanted risk liability lawsuits caused demise E-Z Just So must improvise Fox Tat Sullivan handles available fit needs Lets examine some characteristics good handle far popular handle has very inexperrive small E-Z Just actually tight fit adult hands liked 3-l5/16-in line spacing leadout line adjustable ground inside/outside tuming equivalence Bob Hunt went step fur ther CSC Trujust handle allowed in-the-air adjustment inside/outside turning equiva nce Trujust has line spacing 43/ mainly because space handle plenty big size handwhich should have made handle much sensitive small E-Z Just However Trujust handle considerably overhang E-Z Just tended dampen sensitivity handle will examine overhang below exotic homemade handle Gene Martine Jacksonville FL constructed aluminum wood knurled thumbwheel top allows easy in-flight neutral-elevator adjustment Recently Hunt said did design handle fit hand used long overhang slow down action handle make use wrist action feels characteristics flying said setup allowed him fly nose weight airplane would make better-grooving airplane term 'overhang coined Bob Baron two separate articles about own ad justable control line handle August 1970 issue ModelAirplane News Bill Netzebands column term overhang first appeared diagrammed distance pivot point leadout wire handle rear handle grip later article adjust able handle Bob redefined overhang distance pivot point leadout wire wrist pivot point Model Aviation April 1977 So basically defining overhang talking about distance leadout pivot point leadout wire exits handle supporting point handle Baron August 1970 distance leadout pivot point pivot point hand Baron April 1977 Refer Fig clari fication Personally feel measurement GRIP WiDTH QH1 KCVEMANG C -2 LA0LJT p -J 1 iii I rOt overhang handle moment arm should leadout pivot point plane estab lished front handle grip fingers support handle Overhang Fig can deceptive because different pref erences fliers handle width Overhang B see Fig would vary greatly due different hand sizes Bobs overhang B probably accurate too variable because difference hand sizes too difficult measure future measurements will referring overhang distance leadout pivot point plane established tront handle grip Overhang C see Fig Now have beaten point death lets look overhang some common examples small E-Z Just has 1-1/16 Gene Martine version Baron handle has l-/s Hunts Trujust 2l/2 So what ask Well think important factor consider making own handle along line spacing inside/outside turning equiv alence appears longer theoverhang less sensitive handle line spacing same going build handle think should pattern after Baron/Martine type since allows adjustment three key factors Continued page 143 MAIN 8A -J N tO I LIAOLJT CADMP E- JLJ5T 8-2 3CRW OJIDE LOCI OVEWANG Ov~4A546 S WRI*T pivor OIN -I ~4RON-MTIN& Baron-Martine handle R features adjustments overhang about Wynn has much say column line spacing neutral centering leadouts center handle 70 Model Aviation Handle made Mike Ditrich 2 laminations poplar wood has stock EZ-Just leadout wire Note button back identify Up Control Line COMBAT Charlie Johnson FOR SALE Combat planes handle like camels Being bargain-hunter am couldnt pass up eight pretty decent-looking mod els bargain-basement prices Theyre nice look ing light well-builtbut dont handle very well remember former owner pretty fair luck decide must have putting lot arm flying wont wiggle turn about like stock Voodoo about 1-in differ ence between inboard outboard wings plus huge cutout plug clearance gorilla-sized hands extract same extra 1-in inboard side about inch too much makes model yaw way out turns flop around Some effective outboard lift also being destroyed large cutout around cylinder head first thing fix cutout solve problem taking some FasCal complete backing wrapping around leading edge securing FasCal Very clean just enough clearance get battery clip Well worry about changing plug blows little improvement model still slows excessively turnsactually turn because goes around once dead air Since inboard wing much longer decide add trim tab outboard tip add little area help correct minor warps first trim tab helps isnt big enough add much larger 2-in 6-in tab getting close about turbulators some masking tape turbulators outer portion out board wing might have helped stalling portion doesnt seem anything gained turbulators model has slight warp tab deflected little help correct Once model has straightened tab bent back big difference ability model quick switchbacks adjusting amount up down loops out have just enough control turn model tight possible stalling compensation does wonders model although another inch span outboard wing would have bet ter obvious trim adjustments tab should temporary cure since straight model flips much better needs tweak keep level plug access werent such problem withCombat might worth try metal skin around front cylinder some holes duct air around head upper cylin der could cleaning up front model would make big difference its top end spinner would greatly help prop efficiency too again access limited break few props Combat suppose spinner could designed clean up lines offer crashworthiness absorbing energy much done automobiles put trim tab outboard side because need additional area side inboard side preferable location because less chance pit man accidentally push tab Continued page 151 Charlie bought bunch Combat planes cheapand some Interesting times trying improve model front Above L has trim tab improved fit between engine wing leading edge about info column FasCal paper cover just pushed out way access plug fully-adjustable tailfeathers Above R show strong hinges adjustable control horn run plastic tab up down wire horn adjust total amount elevator travel set screw holds place screw heavy-duty clevis out pushrod vary difference between amount Up Down elevator travel piece tubing clevis keeps popping open hard control punched must closer look paper fairing near engine Compare section wing unmodified model above original builder lost too much lift outer wing panel huge cutout glow plug accessmade model struggle through corners Trim tab outboard wing Charlie prefers inboard tipless opportunity pit man hit used aluminum strip 1/32 plywood gluing done contact cement Warning keep unsealed wood like away wet grass tab will warp 72 Model Aviation CL Aerobatics/Paul Continued page 70 mentioned above Hunt pointed out another ideal feature Baron/Martine handle entire handle line spacing can moved up down relative pivot point wrist can substantially alter trim air plane having handicap performance adding trim weight plane instance moving Down-line tiP towards pivot point wrist will decrease amount outside turn can solve problem plane turns faster outside inside both lines can moved up down same amount give different feel handle However handles Gene Martine pro duced maximum line spacing 35/g stock overhang greater small E-Z Just handle l9/s Mar tine l-A E-Z Just found much too slow postal truck er Pampawagon want build adjustable handle has main bar see Fig 2 3 larger Martines main bar will therefore allow line spacing up 425 Ed Robbert fuel tank building fame have come up Paul/Robbert Super Handle shown Fig 2 Other components handle need some clarification guide blocks 2 main bar 3 leadout clamp 4 adjustable knobs 5 hand grip 6 leadout wire Ed Robbert advises guide blocks should made nylon Zytel acetal Delrinsee Fig 4 should cause less wear leadout cable other materials Nylon stronger acetal susceptible dimension changes due moisture temperature Brass also good material because can tapped nylon acetal cant tapped therefore must use blind nut machine screws material guide blocks must radiused no sharp edges cut leadout wire Ed advises using working drawings supplied article make tolerances close slip-fit both fully realize some will want make items home limited machining abilities main bar shown Fig 3 should made aluminum dimensions shown bar will allow line spacing up 450 Indi viduals may want alter needs leadout clamp see Fig 5 shown machined aluminum bar stock designed give tighest hold leadout wire machining tools may want make part piece aluminum brass edges bent crimped actually larger washer will probably hold leadout wire adjustable knobs see Fig 6 made aluminum shouldnt too hard make limited power tools Ed substituted knurled knob front grip ease field adjustment handle different Martine/Baron handle shown grip can made balsa ply wood core hardwood such pine pop lar nylon aluminum Some prefer contour handle expressly hand think additional material needed makes handle too heavy Keep mind small E-Z Just weighed featherweight 43 gin Martine handle 103 gin nylon grip 70 gin total weight Hunt handle whopping 114 gin think lighter handle 50-75 gin range better handle fly can get better feel airplane pulls lines handle good leadout wire Continued page iso April 1983 143 several sad stories about handles developed frayed leadout wires sub sequently broke causing demise air plane However E-Z Just thickest stranded wire 050 Martines productions f35 cable Hunts handles some very good stainless steel cable 045 Bob said recently cable handles seven strands braided cable E-Z Just handles cable somewhat stiff Hunts cable flexibility important pre cise control near future hope have some information precise type cable obtain Jim Hunt Bobs Father trying recover records CSC operation will tell what cable used loops end leadout wire handle should made just like leadout loops wings Con sult AMA rule book p 17 proper way tie ends After wrapping ends fine brass wire will want either use couple drops epoxy solder loop Some people prefer solder leadout loops because feel heat soldering gun can damage wire opinion average modeler can build handle few nights using tools normally used construct Stunt airplane have advantages machinist friend can adhere strictly dimensions presented Figure 2 Because previous dependence E-Z Just handle fliers long feel trimming variables handle lines has frequently overlooked Although Baron pointed out 1977 article has taken until demise available handles cause fliers explore variables handle/line trimming decide build own handle certain pick quality componentsthats pride joy out end lines Also information Stunt PAMPA contact Wynn Paul 1640 Mavwick Dr Lexington KY 40504 CL Scale/Boss Contirtued page 69 now ready mounting ply platform Drill appropriate hole 6-32 bolt about -in end plywood piece mount spring attach just-completed control -valve unit spring can now pull back valve body tension placed spring hold body plywood together small C-clamp spring tension can tested Using pull-test-type scale 0-25 0-50 lb scale will attached free wire loop test pull required operate valve Adjust valve position minimum 12-15 lb pull required operate valve completely position determined drill appropriate holes plywood mount valve 2-56 bolts now ready install unit models wing Referring once again December column will notice Sketch theres con siderable amount platform space behind bellcrank ideal place mounting either tOp bottom platform com pleted retract-control unit After mounting unit hook up retract special design often times required reproduce special paint design cowling tail surface go along particular color scheme artist probably can paint design model free hand average guy art department following procedure might pre vent ruining models finish Start determining exact size shape design Next make frame scrap balsa /x /4 square about er design sides Now dope piece silkspan over frame its dry water-shrink tissue would cover ing models wing tissue completely dry draw design tissue very soft lead pencil taking care tear tissue draw ing complete paint appropriate colors using several thin coats Note paint used should compatible models overall finish Using several thin coats will allow buildup paint color design completed paint thoroughly dry remove balsa frame pair scissors carefully cut out newly-made design Apply design model spreading light coat clear dope back design still wet apply model much would decal careful Use minimum amount dope point will soften design paint too much design prop erly affixed model can apply coat 150 Model Aviation certain stay away power lines flying system hoses attach appropriate leadout wire flying lines good conductors electricity thread through wing youwould belland dont want take chances flying crank leadoutyour installation now complete anywhere near power lines ready use recommend wire used information working drawings fourth line operate unit flying materials required control line handle small 015 stranded wire has worked well can contact Ed Robbert 1616 Meadowthorpe Ave. Lexington KY 40505 tel 606 253-1769 clear over design surrounding area hesitate apply design made fashion new model might good idea practice old model once twice get feel much dope required great ad vantage making special designs manner mined design does mean ruined model finish Send items CL Scale Bill Bos 77-06 269th St New Hyde Pork NY 11040 FW 190/Paul Continued page 68 front Add rudder square set aside dry Give wing assembly good sanding Apply two coats dope seal wood Sand rough spots cover wing lightweight silkspan prefer put silkspan wet allow irregular curves might exist Cover panel separately well tips Give fin ished wing light spray water set aside covering shrink wing dry begin fitting fuselage assembly helps add lot strength model fit looks good epoxy wing fuselage check squareness stress alignment lot because model built true will fly true will have strange habits flying either upright inverted After epoxy has cured give entire model five coats clear dope sanding well tween coats finish makes model come alive comes profiles Look around color scheme like try copy several books available have color plans Focke WuIf 190 colors shown plan model authentic used military flats background colors plastic tape tnstgnta trim numbers control out lines Add wheels engine propeller Hook up pushrod balance model try fly model balancing it can very tricky fly wtth wrong balance point Add whatever weight needs before head fly ing field original model flown 35-ft steel lines markedly improve As per formance over cloth Dacron lines Steel lines also much safer Flying Once field hook up con trol lines check out work Ad just handle ensure neutral control model handle neutral first few flights feel model out slowly Begin climbs dives gradually work up loops figure eights inverted flight Focke Wulfe 190 will stunts except squares difficulty Before try Combat matches suggest get well acquainted models minimum maximum turning radius will help save pulling out too late heat duel Get know 190 intimately con flying buddy building Spitfire CL Combat/Johnson Continued naoe 72 direction another fully-deflected tab would probably make interesting flight would amuse opponent least fuse 1/32-in plywood actual tabs plenty heavy can cut scissors knife Fuel-proofing optional keep unsealed wood away wet grass because neat trim tab will warp youll need tab tab Contact cement works very well securing wood aluminum wing Its about best thing Ive found hooking tabs plastic-covered wings youre doing put thin coat both surfaces allow dry can read instructions bottle wait Aluminum works real well hinge material probably about 010-in right use thinner material will bend easily thicker seems hold setting better can cut aluminum scissors easily youll notice strips like curl up after theyve cutwhich going make hard attach Take piece hardwood like motor mount run back forth across strip holding hard surface like table bench may have flip over couple times pretty soon aluminum will give up stay straight can attach no problems sure leave little room between trim tab trailing edge adjustment something can done few minutes field models always built straight can used April 1983 151