iHE BY THE LATE 1930s Gordon Scotty Murray become well-known eastern free-flight competition series fine flying designs masterpiecefor old timers remember himwas Answer also known Topper latter being kit Answer published Model Airplane News August 1940 Murray distinguished use cleverly designed wing unusual both its method construction aerody namic features thin-sectioned heavily under-cambered elliptical dihedral planform Structurally consisted sheet-balsa outline frame fastened assembly templates attached work surface Its unusual aspect after incor porating certain amount straight di hedral Murray relied shrinkage covering bend panels progressively up towards tips works very well unique ship did have superior per formanceone resaons re vived used up 19 engines Class models 20 30 Class B its first outing won major meet established 1940 record several times done over 5 minutes Class C version Dennymite set another record 836 Murray wrote ship combined high lift efficiency Say what will has proved satisfaction critical build ers wing really has stuff model scaled 02 power inas much good ships Replica Old Timer classification much demand pleasant size build fly wish RC Assist has flown Ace equipment including singleended Baby actuator control system loosely described pulse rudder Al though rudder wiggles back forth response transmitted pulses its average position determined posi tion transmitter stick can use lightweight multi-channel systemsuch Cannonif wish additional controls Since airplane undoubtedly will built have requisite ex perience have attempted prepare ~now glue this' type articlewhich such builders probably ignore anyway course Scotty being us have no author fitting leave way order present plans pictures Jack Florenzie undertook con struction sample goes saying did competent job wing course requires com mentary some other points may obvious offhand Wing Because wing distinctive feature shipand built differently anything average free fighters experiencewe shall tackle first shall describe first method detailed Murray original MAN article improved procedure followed Jack Florenzie making 02 version MA Both methods basically same can build either way Jacks method allows building wing hand pinning down makes easier butt panels together dihedral Basically first step cut wing outline pieces V8 X 3 sheet balsa model shown plan Florenzie foundthat wing quite strong therefore very soft sheet can used wing outline pieces butt-glued together shown wing planform pinning pieces down drawing form camber wing panel Murray first fastened down plan three jig templates shown wing 40 Model Aviation Scotty Murrays famous 1940 design makes ideal 02-powered Replica Old-Timerfly either free flight RC Assist plan first drawn line spanwise root tip one-third chord line line afterwards aided lining up high point rib inserted upper lefthand corner plan will find wing-rib-and-building-jig template lower left corner will note positions three jig templates drawn under wing panel spanwise line mentioned about later Murray another cute trick cut 36 identical ribs using top curve template ribs same thickness depth sheet outlines slightly larger sanded later 1/8 panel template dropped 1/8 model after cutting top camber cut undercamber rib did make rib highpoints co incide spanwise line draw ing first measured end sheet balsa distance TE highpoint rib square marked pencil line across sheet trim rib proper length laid rib over sheet-balsa panel outline mark directly over spanwise line drawn plan course necessary keep marking sheet balsa used up cut ting ribs make sheet-balsa panel outline maintain airfoil shape soaked sheet water before pinning place templates already attached plan joined two panels di hedral cemented 1/16 ply tem plate underside wing reenforcement center trimmed material fit glue dried used gauze reenforce center joint Neither original plan Murrays structions made clear wing rested fuselage topthere no indication bottom wing cabin area sheet covered So making 02 version Florenzie located two flat-bottomed ribs 3/32 sheet coincide lengthwise cabin pieces fuselage added 3/32 sq pieces cabin top ribs rest upon wing rubberbanded place following construction sequence model incorporates special step-by step procedure devised Jack Instead building wing plan make two rectangles 3/8 sq balsa measure 18 X 7 glue frame three jig templatessee wing planform plan positions after butt-gluing gether sheet-balsa wing outlines outlines curved over frames see below tack-glued position enables build wing halves hands see bottom wing glue ribs place necessary fasten wing down bench workboard top wing can sanded dihedral glued wing still frames Smear center-line joint several coats glue HL glider wing outlines notched 1/16 wide 1/8 deep LE IE sprayed alcohol before bending over frames Dihedral 2/4 under tip before covering 36 wing ribs cut previously described usingthe ply template As shown plan stretch piece thread spanwise across templates glued forms cutting ribs mark sheet balsa described previ ously mark remains ribs cut out aligned thread trim front rear ends rib fit its station Murray noted original article ribs turned over placing outline trimming trimming can done easily accurately Fuselage bit tricky Murray built originalweve added few sug April 197741 Murrays airplanes distinguished not-often-seen wing design curved dihedral rather like todays Hobie Hawk sailplaneand elliptical sheet-balsa planform replica based upon MAN 1940 plans beautifully built Jack Florenzie No spars used deeply-cambered wing Taut covering adds todihedralsee sketch plan gestions After assembling fuselage sides bench normal manner joining sides built upper cabin portion air Note front view 1/16-in cabin brace visible semi-circular line indicates probably removed surplus ma terial after brace place cementing brace place first easier locate two front cabin up right pieceswhich can glued against brace suggest might add similar cabin braces perhaps did same manner across ship between up right cross pieces appear win dow area rear cabin suggested locatebe careful exact fitthe front rearmost cabin uprights first glue top cabin longerons finally insert window cross pieces plans show 1/16 ply top cowl piecenote double curvature side view would difficult impossible Make straight-line cowl shown pictures model Most modern modelers somewhat baffled stick-and-tissue construction way life old-timers especially comes assembling fuselage sides joining together cross pieces So try way Over side view lay piece Saran Wrap prevent glue sticking frame bench Wax paper reacts cellu lose cements Pin down top longeron bottom window line shaped fuse lage bottom piece Dont drive pins through longeron pieces locate snug against side wood Locate pins adjacent spots cross pieces insert out way actual joint Cement bottom longeron formed piece pin place Cut side-view cross pieces fit snug ly force-fit using cement like Ambroid glue like Elmers remove cross pieces time place small dab glue ends piece touch piece longeron intended joints slide cross pieces posi tion Perhaps things like Hot Stuff use precise fits place little glue joint removing cross piece Capillary action does rest dry remove pins lay another piece Saran Wrap over work assemble second side over first same manner join sides note fuselage narrower bottom window level Fortunately sides parallel foremost bulk head 1-B trailing edge station makes things easier Glue former 1-B both sides using pins hold alignment glue place cross piece between top longerons trailing edge station OK run holding pins through longerons Before dry install bottom cross piece station immediately aft curved bottom fuse lage piece Before dries turn Continued page 95 42 Model Aviation Secret good covering job neat final appearance painstaking sanding Straight dihedral built incovering does rest ribs sliced using template provided inserted sheet balsa outline bent over wing-jig templates fastened plan Original held two 1940 records cut perimeter give clearance ribs attach outline expanded view Fig 1 Careful work allows wing stab essentially identical previous ones except chance tentional variations wood thickness grade use form first shape curved portions outline wrap ping moist balsa strips proper size around identically shaped tip form baking oven set low heat Straight portions outline laid place straight pins holding against form Fig 2 shows delicate strips held placenever pin through wood Use angle splice Fig 3 join curved portions straight sec tions using care avoid glueing strips form Finally ribs cut exact length glued place Variations Theme compression ribs Fig 4 used form must slotted entire length rib shown Fig 5 dark lines appear between solid rib supports jig shown Fig 5 used both building wing covering solid ribs support standard ribs during covering opera tion prevent pressure micro film distorting ribs Another vari ation shown Fig 6 Easy B jig al lows wing built dihedral already installed covered wing posts attached slot supporting frame allows posts visually aligned similar arrangement can used bracingwhich would allow wing completed before ever removed work surface very careful work extremely accurate con struction wings can made Bud Tenny P 0 Box 545 Richardson TX 75080 Answer Continued page 43 fuselage upside down bench check its alignment Weigh down much necessary hold true against surface put weight top longerons nearest bench Other cross pieces forward TE station now inserted dry sides pulled together rear cementednote beveled joint important accurately make sure rest top fuselage plan tail joint centerline correct before cement dries remaining top bottom cross pieces now cut length glued place upper part cabin tricky said before some suggestions given Stringers should hard balsa prevent unsightly bowing shrinkage covering r FOR SHARK 60 OWNERS. Stahl design see tocal hobby dealer - 4 RUBBER & CO2 OGA *109 und AWINNERAT THE 5OIhNATS V t 4Oyeors ago Send tree brochure 10% FOR PACKING AND POSTAGE VA RESIDENTS ADD 4% TAD 22 I/2 WINGSPAN 6695 nose block pieces should glued place before final shaping Just sure true sand rear front faces pieces before commit yourself Start side blocks see comment below engine installation glue projecting top longeron bulkhead 1-B glue front block finally bottom block Note first trimmed fit inside surface some what cut away lightness before located engine mounting differs original model beam mounts Since engine mounted well forward FLYLINE 10643 ASHBY FL MODELS FAIRFAX VA 22030 front cabin bulkhead small ply wood firewall cut out per plans located means two balsa rectan gular pieces grain fore aft shown Blind nuts make easy bolt engine place remove make thrustline adjustments placing thin washers metal shims between case fire wallaccording adjustment needs would well coat interior engine compartment epoxy protect absorbing fuel exhaust wastes Covering Important note skele ton photos show straight dihedral finished wing has elliptical dihedral April 1977 95 O3 Notr novice flyers RO PRODUCTS INCORPORATED 480 Benner Read Waucenda IllInels 60084 USA 24 l/2 WINGSPAN 28 WINGSPAN S6 Doping final covering will auto matically impart curvature youd like specific measurement wing half has 2/4 inches dihedral panels first joined together after covering shrinks tips should have 4 43/4 inches dihedral also important covering material adhered rib both top bottom wing Moisten paper first light sprayjust enough make damp will have stick covering lower sides rib anyway order retain camber adhering paper top surface material will pull away ribs tips bow position Covering may either Japanese tissue lightweight Silkspan former ade quate perhaps bit easier work live area punctures likely Silkspan may preferred balsa surfaces come contact covering given two coats full strength dope sanding down fuzz after first coat brushing coats dope thin dope 50-50 Use coats needed fill stretch material case wing enough its top surface bow its final elliptical shape Finally brush two coats low-shrink dopesuch Sig sure covering filled taut before applying low-shrink dope because will provide further shrinking have wrinkles stage will remain Wed interested make out send us some pictures writing advertisers mention read about MA ADVERTISERS INDEX Ace Radio Control Inc79 Andrews Aircraft Model Co88 Coverite94 Cox Hobbies92 Du-Bro Products Inc94 95 Flyline Models95 Fox Mfg Company5 Fusite Emerson Electric Co93 Carl Goldberg Models16 Grish Brothers86 Paul K Guillow Inc83 Harrys Hobbies Inc86 K&BMfg3 Kraft Great Lakes87 MACShow89 Midwest Products Company4 Pactra Industries Inc85 Peck-Polymers85 Polks Hobby Dept Stores .. 8890 Progress Mfg Company82 SC Modeler Hobby Shop80 Sig Mfg Company1 Sterling Models Inc90 Sullivan Products Inc84 Toledo Weak Signals Show91 Westport International81 Williams Brothers80 World EnginesBack Cover WRAM Show 197792 96 Model Aviation
Edition: Model Aviation - 1977/04
Page Numbers: 40, 41, 42, 95, 96
iHE BY THE LATE 1930s Gordon Scotty Murray become well-known eastern free-flight competition series fine flying designs masterpiecefor old timers remember himwas Answer also known Topper latter being kit Answer published Model Airplane News August 1940 Murray distinguished use cleverly designed wing unusual both its method construction aerody namic features thin-sectioned heavily under-cambered elliptical dihedral planform Structurally consisted sheet-balsa outline frame fastened assembly templates attached work surface Its unusual aspect after incor porating certain amount straight di hedral Murray relied shrinkage covering bend panels progressively up towards tips works very well unique ship did have superior per formanceone resaons re vived used up 19 engines Class models 20 30 Class B its first outing won major meet established 1940 record several times done over 5 minutes Class C version Dennymite set another record 836 Murray wrote ship combined high lift efficiency Say what will has proved satisfaction critical build ers wing really has stuff model scaled 02 power inas much good ships Replica Old Timer classification much demand pleasant size build fly wish RC Assist has flown Ace equipment including singleended Baby actuator control system loosely described pulse rudder Al though rudder wiggles back forth response transmitted pulses its average position determined posi tion transmitter stick can use lightweight multi-channel systemsuch Cannonif wish additional controls Since airplane undoubtedly will built have requisite ex perience have attempted prepare ~now glue this' type articlewhich such builders probably ignore anyway course Scotty being us have no author fitting leave way order present plans pictures Jack Florenzie undertook con struction sample goes saying did competent job wing course requires com mentary some other points may obvious offhand Wing Because wing distinctive feature shipand built differently anything average free fighters experiencewe shall tackle first shall describe first method detailed Murray original MAN article improved procedure followed Jack Florenzie making 02 version MA Both methods basically same can build either way Jacks method allows building wing hand pinning down makes easier butt panels together dihedral Basically first step cut wing outline pieces V8 X 3 sheet balsa model shown plan Florenzie foundthat wing quite strong therefore very soft sheet can used wing outline pieces butt-glued together shown wing planform pinning pieces down drawing form camber wing panel Murray first fastened down plan three jig templates shown wing 40 Model Aviation Scotty Murrays famous 1940 design makes ideal 02-powered Replica Old-Timerfly either free flight RC Assist plan first drawn line spanwise root tip one-third chord line line afterwards aided lining up high point rib inserted upper lefthand corner plan will find wing-rib-and-building-jig template lower left corner will note positions three jig templates drawn under wing panel spanwise line mentioned about later Murray another cute trick cut 36 identical ribs using top curve template ribs same thickness depth sheet outlines slightly larger sanded later 1/8 panel template dropped 1/8 model after cutting top camber cut undercamber rib did make rib highpoints co incide spanwise line draw ing first measured end sheet balsa distance TE highpoint rib square marked pencil line across sheet trim rib proper length laid rib over sheet-balsa panel outline mark directly over spanwise line drawn plan course necessary keep marking sheet balsa used up cut ting ribs make sheet-balsa panel outline maintain airfoil shape soaked sheet water before pinning place templates already attached plan joined two panels di hedral cemented 1/16 ply tem plate underside wing reenforcement center trimmed material fit glue dried used gauze reenforce center joint Neither original plan Murrays structions made clear wing rested fuselage topthere no indication bottom wing cabin area sheet covered So making 02 version Florenzie located two flat-bottomed ribs 3/32 sheet coincide lengthwise cabin pieces fuselage added 3/32 sq pieces cabin top ribs rest upon wing rubberbanded place following construction sequence model incorporates special step-by step procedure devised Jack Instead building wing plan make two rectangles 3/8 sq balsa measure 18 X 7 glue frame three jig templatessee wing planform plan positions after butt-gluing gether sheet-balsa wing outlines outlines curved over frames see below tack-glued position enables build wing halves hands see bottom wing glue ribs place necessary fasten wing down bench workboard top wing can sanded dihedral glued wing still frames Smear center-line joint several coats glue HL glider wing outlines notched 1/16 wide 1/8 deep LE IE sprayed alcohol before bending over frames Dihedral 2/4 under tip before covering 36 wing ribs cut previously described usingthe ply template As shown plan stretch piece thread spanwise across templates glued forms cutting ribs mark sheet balsa described previ ously mark remains ribs cut out aligned thread trim front rear ends rib fit its station Murray noted original article ribs turned over placing outline trimming trimming can done easily accurately Fuselage bit tricky Murray built originalweve added few sug April 197741 Murrays airplanes distinguished not-often-seen wing design curved dihedral rather like todays Hobie Hawk sailplaneand elliptical sheet-balsa planform replica based upon MAN 1940 plans beautifully built Jack Florenzie No spars used deeply-cambered wing Taut covering adds todihedralsee sketch plan gestions After assembling fuselage sides bench normal manner joining sides built upper cabin portion air Note front view 1/16-in cabin brace visible semi-circular line indicates probably removed surplus ma terial after brace place cementing brace place first easier locate two front cabin up right pieceswhich can glued against brace suggest might add similar cabin braces perhaps did same manner across ship between up right cross pieces appear win dow area rear cabin suggested locatebe careful exact fitthe front rearmost cabin uprights first glue top cabin longerons finally insert window cross pieces plans show 1/16 ply top cowl piecenote double curvature side view would difficult impossible Make straight-line cowl shown pictures model Most modern modelers somewhat baffled stick-and-tissue construction way life old-timers especially comes assembling fuselage sides joining together cross pieces So try way Over side view lay piece Saran Wrap prevent glue sticking frame bench Wax paper reacts cellu lose cements Pin down top longeron bottom window line shaped fuse lage bottom piece Dont drive pins through longeron pieces locate snug against side wood Locate pins adjacent spots cross pieces insert out way actual joint Cement bottom longeron formed piece pin place Cut side-view cross pieces fit snug ly force-fit using cement like Ambroid glue like Elmers remove cross pieces time place small dab glue ends piece touch piece longeron intended joints slide cross pieces posi tion Perhaps things like Hot Stuff use precise fits place little glue joint removing cross piece Capillary action does rest dry remove pins lay another piece Saran Wrap over work assemble second side over first same manner join sides note fuselage narrower bottom window level Fortunately sides parallel foremost bulk head 1-B trailing edge station makes things easier Glue former 1-B both sides using pins hold alignment glue place cross piece between top longerons trailing edge station OK run holding pins through longerons Before dry install bottom cross piece station immediately aft curved bottom fuse lage piece Before dries turn Continued page 95 42 Model Aviation Secret good covering job neat final appearance painstaking sanding Straight dihedral built incovering does rest ribs sliced using template provided inserted sheet balsa outline bent over wing-jig templates fastened plan Original held two 1940 records cut perimeter give clearance ribs attach outline expanded view Fig 1 Careful work allows wing stab essentially identical previous ones except chance tentional variations wood thickness grade use form first shape curved portions outline wrap ping moist balsa strips proper size around identically shaped tip form baking oven set low heat Straight portions outline laid place straight pins holding against form Fig 2 shows delicate strips held placenever pin through wood Use angle splice Fig 3 join curved portions straight sec tions using care avoid glueing strips form Finally ribs cut exact length glued place Variations Theme compression ribs Fig 4 used form must slotted entire length rib shown Fig 5 dark lines appear between solid rib supports jig shown Fig 5 used both building wing covering solid ribs support standard ribs during covering opera tion prevent pressure micro film distorting ribs Another vari ation shown Fig 6 Easy B jig al lows wing built dihedral already installed covered wing posts attached slot supporting frame allows posts visually aligned similar arrangement can used bracingwhich would allow wing completed before ever removed work surface very careful work extremely accurate con struction wings can made Bud Tenny P 0 Box 545 Richardson TX 75080 Answer Continued page 43 fuselage upside down bench check its alignment Weigh down much necessary hold true against surface put weight top longerons nearest bench Other cross pieces forward TE station now inserted dry sides pulled together rear cementednote beveled joint important accurately make sure rest top fuselage plan tail joint centerline correct before cement dries remaining top bottom cross pieces now cut length glued place upper part cabin tricky said before some suggestions given Stringers should hard balsa prevent unsightly bowing shrinkage covering r FOR SHARK 60 OWNERS. Stahl design see tocal hobby dealer - 4 RUBBER & CO2 OGA *109 und AWINNERAT THE 5OIhNATS V t 4Oyeors ago Send tree brochure 10% FOR PACKING AND POSTAGE VA RESIDENTS ADD 4% TAD 22 I/2 WINGSPAN 6695 nose block pieces should glued place before final shaping Just sure true sand rear front faces pieces before commit yourself Start side blocks see comment below engine installation glue projecting top longeron bulkhead 1-B glue front block finally bottom block Note first trimmed fit inside surface some what cut away lightness before located engine mounting differs original model beam mounts Since engine mounted well forward FLYLINE 10643 ASHBY FL MODELS FAIRFAX VA 22030 front cabin bulkhead small ply wood firewall cut out per plans located means two balsa rectan gular pieces grain fore aft shown Blind nuts make easy bolt engine place remove make thrustline adjustments placing thin washers metal shims between case fire wallaccording adjustment needs would well coat interior engine compartment epoxy protect absorbing fuel exhaust wastes Covering Important note skele ton photos show straight dihedral finished wing has elliptical dihedral April 1977 95 O3 Notr novice flyers RO PRODUCTS INCORPORATED 480 Benner Read Waucenda IllInels 60084 USA 24 l/2 WINGSPAN 28 WINGSPAN S6 Doping final covering will auto matically impart curvature youd like specific measurement wing half has 2/4 inches dihedral panels first joined together after covering shrinks tips should have 4 43/4 inches dihedral also important covering material adhered rib both top bottom wing Moisten paper first light sprayjust enough make damp will have stick covering lower sides rib anyway order retain camber adhering paper top surface material will pull away ribs tips bow position Covering may either Japanese tissue lightweight Silkspan former ade quate perhaps bit easier work live area punctures likely Silkspan may preferred balsa surfaces come contact covering given two coats full strength dope sanding down fuzz after first coat brushing coats dope thin dope 50-50 Use coats needed fill stretch material case wing enough its top surface bow its final elliptical shape Finally brush two coats low-shrink dopesuch Sig sure covering filled taut before applying low-shrink dope because will provide further shrinking have wrinkles stage will remain Wed interested make out send us some pictures writing advertisers mention read about MA ADVERTISERS INDEX Ace Radio Control Inc79 Andrews Aircraft Model Co88 Coverite94 Cox Hobbies92 Du-Bro Products Inc94 95 Flyline Models95 Fox Mfg Company5 Fusite Emerson Electric Co93 Carl Goldberg Models16 Grish Brothers86 Paul K Guillow Inc83 Harrys Hobbies Inc86 K&BMfg3 Kraft Great Lakes87 MACShow89 Midwest Products Company4 Pactra Industries Inc85 Peck-Polymers85 Polks Hobby Dept Stores .. 8890 Progress Mfg Company82 SC Modeler Hobby Shop80 Sig Mfg Company1 Sterling Models Inc90 Sullivan Products Inc84 Toledo Weak Signals Show91 Westport International81 Williams Brothers80 World EnginesBack Cover WRAM Show 197792 96 Model Aviation
Edition: Model Aviation - 1977/04
Page Numbers: 40, 41, 42, 95, 96
iHE BY THE LATE 1930s Gordon Scotty Murray become well-known eastern free-flight competition series fine flying designs masterpiecefor old timers remember himwas Answer also known Topper latter being kit Answer published Model Airplane News August 1940 Murray distinguished use cleverly designed wing unusual both its method construction aerody namic features thin-sectioned heavily under-cambered elliptical dihedral planform Structurally consisted sheet-balsa outline frame fastened assembly templates attached work surface Its unusual aspect after incor porating certain amount straight di hedral Murray relied shrinkage covering bend panels progressively up towards tips works very well unique ship did have superior per formanceone resaons re vived used up 19 engines Class models 20 30 Class B its first outing won major meet established 1940 record several times done over 5 minutes Class C version Dennymite set another record 836 Murray wrote ship combined high lift efficiency Say what will has proved satisfaction critical build ers wing really has stuff model scaled 02 power inas much good ships Replica Old Timer classification much demand pleasant size build fly wish RC Assist has flown Ace equipment including singleended Baby actuator control system loosely described pulse rudder Al though rudder wiggles back forth response transmitted pulses its average position determined posi tion transmitter stick can use lightweight multi-channel systemsuch Cannonif wish additional controls Since airplane undoubtedly will built have requisite ex perience have attempted prepare ~now glue this' type articlewhich such builders probably ignore anyway course Scotty being us have no author fitting leave way order present plans pictures Jack Florenzie undertook con struction sample goes saying did competent job wing course requires com mentary some other points may obvious offhand Wing Because wing distinctive feature shipand built differently anything average free fighters experiencewe shall tackle first shall describe first method detailed Murray original MAN article improved procedure followed Jack Florenzie making 02 version MA Both methods basically same can build either way Jacks method allows building wing hand pinning down makes easier butt panels together dihedral Basically first step cut wing outline pieces V8 X 3 sheet balsa model shown plan Florenzie foundthat wing quite strong therefore very soft sheet can used wing outline pieces butt-glued together shown wing planform pinning pieces down drawing form camber wing panel Murray first fastened down plan three jig templates shown wing 40 Model Aviation Scotty Murrays famous 1940 design makes ideal 02-powered Replica Old-Timerfly either free flight RC Assist plan first drawn line spanwise root tip one-third chord line line afterwards aided lining up high point rib inserted upper lefthand corner plan will find wing-rib-and-building-jig template lower left corner will note positions three jig templates drawn under wing panel spanwise line mentioned about later Murray another cute trick cut 36 identical ribs using top curve template ribs same thickness depth sheet outlines slightly larger sanded later 1/8 panel template dropped 1/8 model after cutting top camber cut undercamber rib did make rib highpoints co incide spanwise line draw ing first measured end sheet balsa distance TE highpoint rib square marked pencil line across sheet trim rib proper length laid rib over sheet-balsa panel outline mark directly over spanwise line drawn plan course necessary keep marking sheet balsa used up cut ting ribs make sheet-balsa panel outline maintain airfoil shape soaked sheet water before pinning place templates already attached plan joined two panels di hedral cemented 1/16 ply tem plate underside wing reenforcement center trimmed material fit glue dried used gauze reenforce center joint Neither original plan Murrays structions made clear wing rested fuselage topthere no indication bottom wing cabin area sheet covered So making 02 version Florenzie located two flat-bottomed ribs 3/32 sheet coincide lengthwise cabin pieces fuselage added 3/32 sq pieces cabin top ribs rest upon wing rubberbanded place following construction sequence model incorporates special step-by step procedure devised Jack Instead building wing plan make two rectangles 3/8 sq balsa measure 18 X 7 glue frame three jig templatessee wing planform plan positions after butt-gluing gether sheet-balsa wing outlines outlines curved over frames see below tack-glued position enables build wing halves hands see bottom wing glue ribs place necessary fasten wing down bench workboard top wing can sanded dihedral glued wing still frames Smear center-line joint several coats glue HL glider wing outlines notched 1/16 wide 1/8 deep LE IE sprayed alcohol before bending over frames Dihedral 2/4 under tip before covering 36 wing ribs cut previously described usingthe ply template As shown plan stretch piece thread spanwise across templates glued forms cutting ribs mark sheet balsa described previ ously mark remains ribs cut out aligned thread trim front rear ends rib fit its station Murray noted original article ribs turned over placing outline trimming trimming can done easily accurately Fuselage bit tricky Murray built originalweve added few sug April 197741 Murrays airplanes distinguished not-often-seen wing design curved dihedral rather like todays Hobie Hawk sailplaneand elliptical sheet-balsa planform replica based upon MAN 1940 plans beautifully built Jack Florenzie No spars used deeply-cambered wing Taut covering adds todihedralsee sketch plan gestions After assembling fuselage sides bench normal manner joining sides built upper cabin portion air Note front view 1/16-in cabin brace visible semi-circular line indicates probably removed surplus ma terial after brace place cementing brace place first easier locate two front cabin up right pieceswhich can glued against brace suggest might add similar cabin braces perhaps did same manner across ship between up right cross pieces appear win dow area rear cabin suggested locatebe careful exact fitthe front rearmost cabin uprights first glue top cabin longerons finally insert window cross pieces plans show 1/16 ply top cowl piecenote double curvature side view would difficult impossible Make straight-line cowl shown pictures model Most modern modelers somewhat baffled stick-and-tissue construction way life old-timers especially comes assembling fuselage sides joining together cross pieces So try way Over side view lay piece Saran Wrap prevent glue sticking frame bench Wax paper reacts cellu lose cements Pin down top longeron bottom window line shaped fuse lage bottom piece Dont drive pins through longeron pieces locate snug against side wood Locate pins adjacent spots cross pieces insert out way actual joint Cement bottom longeron formed piece pin place Cut side-view cross pieces fit snug ly force-fit using cement like Ambroid glue like Elmers remove cross pieces time place small dab glue ends piece touch piece longeron intended joints slide cross pieces posi tion Perhaps things like Hot Stuff use precise fits place little glue joint removing cross piece Capillary action does rest dry remove pins lay another piece Saran Wrap over work assemble second side over first same manner join sides note fuselage narrower bottom window level Fortunately sides parallel foremost bulk head 1-B trailing edge station makes things easier Glue former 1-B both sides using pins hold alignment glue place cross piece between top longerons trailing edge station OK run holding pins through longerons Before dry install bottom cross piece station immediately aft curved bottom fuse lage piece Before dries turn Continued page 95 42 Model Aviation Secret good covering job neat final appearance painstaking sanding Straight dihedral built incovering does rest ribs sliced using template provided inserted sheet balsa outline bent over wing-jig templates fastened plan Original held two 1940 records cut perimeter give clearance ribs attach outline expanded view Fig 1 Careful work allows wing stab essentially identical previous ones except chance tentional variations wood thickness grade use form first shape curved portions outline wrap ping moist balsa strips proper size around identically shaped tip form baking oven set low heat Straight portions outline laid place straight pins holding against form Fig 2 shows delicate strips held placenever pin through wood Use angle splice Fig 3 join curved portions straight sec tions using care avoid glueing strips form Finally ribs cut exact length glued place Variations Theme compression ribs Fig 4 used form must slotted entire length rib shown Fig 5 dark lines appear between solid rib supports jig shown Fig 5 used both building wing covering solid ribs support standard ribs during covering opera tion prevent pressure micro film distorting ribs Another vari ation shown Fig 6 Easy B jig al lows wing built dihedral already installed covered wing posts attached slot supporting frame allows posts visually aligned similar arrangement can used bracingwhich would allow wing completed before ever removed work surface very careful work extremely accurate con struction wings can made Bud Tenny P 0 Box 545 Richardson TX 75080 Answer Continued page 43 fuselage upside down bench check its alignment Weigh down much necessary hold true against surface put weight top longerons nearest bench Other cross pieces forward TE station now inserted dry sides pulled together rear cementednote beveled joint important accurately make sure rest top fuselage plan tail joint centerline correct before cement dries remaining top bottom cross pieces now cut length glued place upper part cabin tricky said before some suggestions given Stringers should hard balsa prevent unsightly bowing shrinkage covering r FOR SHARK 60 OWNERS. Stahl design see tocal hobby dealer - 4 RUBBER & CO2 OGA *109 und AWINNERAT THE 5OIhNATS V t 4Oyeors ago Send tree brochure 10% FOR PACKING AND POSTAGE VA RESIDENTS ADD 4% TAD 22 I/2 WINGSPAN 6695 nose block pieces should glued place before final shaping Just sure true sand rear front faces pieces before commit yourself Start side blocks see comment below engine installation glue projecting top longeron bulkhead 1-B glue front block finally bottom block Note first trimmed fit inside surface some what cut away lightness before located engine mounting differs original model beam mounts Since engine mounted well forward FLYLINE 10643 ASHBY FL MODELS FAIRFAX VA 22030 front cabin bulkhead small ply wood firewall cut out per plans located means two balsa rectan gular pieces grain fore aft shown Blind nuts make easy bolt engine place remove make thrustline adjustments placing thin washers metal shims between case fire wallaccording adjustment needs would well coat interior engine compartment epoxy protect absorbing fuel exhaust wastes Covering Important note skele ton photos show straight dihedral finished wing has elliptical dihedral April 1977 95 O3 Notr novice flyers RO PRODUCTS INCORPORATED 480 Benner Read Waucenda IllInels 60084 USA 24 l/2 WINGSPAN 28 WINGSPAN S6 Doping final covering will auto matically impart curvature youd like specific measurement wing half has 2/4 inches dihedral panels first joined together after covering shrinks tips should have 4 43/4 inches dihedral also important covering material adhered rib both top bottom wing Moisten paper first light sprayjust enough make damp will have stick covering lower sides rib anyway order retain camber adhering paper top surface material will pull away ribs tips bow position Covering may either Japanese tissue lightweight Silkspan former ade quate perhaps bit easier work live area punctures likely Silkspan may preferred balsa surfaces come contact covering given two coats full strength dope sanding down fuzz after first coat brushing coats dope thin dope 50-50 Use coats needed fill stretch material case wing enough its top surface bow its final elliptical shape Finally brush two coats low-shrink dopesuch Sig sure covering filled taut before applying low-shrink dope because will provide further shrinking have wrinkles stage will remain Wed interested make out send us some pictures writing advertisers mention read about MA ADVERTISERS INDEX Ace Radio Control Inc79 Andrews Aircraft Model Co88 Coverite94 Cox Hobbies92 Du-Bro Products Inc94 95 Flyline Models95 Fox Mfg Company5 Fusite Emerson Electric Co93 Carl Goldberg Models16 Grish Brothers86 Paul K Guillow Inc83 Harrys Hobbies Inc86 K&BMfg3 Kraft Great Lakes87 MACShow89 Midwest Products Company4 Pactra Industries Inc85 Peck-Polymers85 Polks Hobby Dept Stores .. 8890 Progress Mfg Company82 SC Modeler Hobby Shop80 Sig Mfg Company1 Sterling Models Inc90 Sullivan Products Inc84 Toledo Weak Signals Show91 Westport International81 Williams Brothers80 World EnginesBack Cover WRAM Show 197792 96 Model Aviation
Edition: Model Aviation - 1977/04
Page Numbers: 40, 41, 42, 95, 96
iHE BY THE LATE 1930s Gordon Scotty Murray become well-known eastern free-flight competition series fine flying designs masterpiecefor old timers remember himwas Answer also known Topper latter being kit Answer published Model Airplane News August 1940 Murray distinguished use cleverly designed wing unusual both its method construction aerody namic features thin-sectioned heavily under-cambered elliptical dihedral planform Structurally consisted sheet-balsa outline frame fastened assembly templates attached work surface Its unusual aspect after incor porating certain amount straight di hedral Murray relied shrinkage covering bend panels progressively up towards tips works very well unique ship did have superior per formanceone resaons re vived used up 19 engines Class models 20 30 Class B its first outing won major meet established 1940 record several times done over 5 minutes Class C version Dennymite set another record 836 Murray wrote ship combined high lift efficiency Say what will has proved satisfaction critical build ers wing really has stuff model scaled 02 power inas much good ships Replica Old Timer classification much demand pleasant size build fly wish RC Assist has flown Ace equipment including singleended Baby actuator control system loosely described pulse rudder Al though rudder wiggles back forth response transmitted pulses its average position determined posi tion transmitter stick can use lightweight multi-channel systemsuch Cannonif wish additional controls Since airplane undoubtedly will built have requisite ex perience have attempted prepare ~now glue this' type articlewhich such builders probably ignore anyway course Scotty being us have no author fitting leave way order present plans pictures Jack Florenzie undertook con struction sample goes saying did competent job wing course requires com mentary some other points may obvious offhand Wing Because wing distinctive feature shipand built differently anything average free fighters experiencewe shall tackle first shall describe first method detailed Murray original MAN article improved procedure followed Jack Florenzie making 02 version MA Both methods basically same can build either way Jacks method allows building wing hand pinning down makes easier butt panels together dihedral Basically first step cut wing outline pieces V8 X 3 sheet balsa model shown plan Florenzie foundthat wing quite strong therefore very soft sheet can used wing outline pieces butt-glued together shown wing planform pinning pieces down drawing form camber wing panel Murray first fastened down plan three jig templates shown wing 40 Model Aviation Scotty Murrays famous 1940 design makes ideal 02-powered Replica Old-Timerfly either free flight RC Assist plan first drawn line spanwise root tip one-third chord line line afterwards aided lining up high point rib inserted upper lefthand corner plan will find wing-rib-and-building-jig template lower left corner will note positions three jig templates drawn under wing panel spanwise line mentioned about later Murray another cute trick cut 36 identical ribs using top curve template ribs same thickness depth sheet outlines slightly larger sanded later 1/8 panel template dropped 1/8 model after cutting top camber cut undercamber rib did make rib highpoints co incide spanwise line draw ing first measured end sheet balsa distance TE highpoint rib square marked pencil line across sheet trim rib proper length laid rib over sheet-balsa panel outline mark directly over spanwise line drawn plan course necessary keep marking sheet balsa used up cut ting ribs make sheet-balsa panel outline maintain airfoil shape soaked sheet water before pinning place templates already attached plan joined two panels di hedral cemented 1/16 ply tem plate underside wing reenforcement center trimmed material fit glue dried used gauze reenforce center joint Neither original plan Murrays structions made clear wing rested fuselage topthere no indication bottom wing cabin area sheet covered So making 02 version Florenzie located two flat-bottomed ribs 3/32 sheet coincide lengthwise cabin pieces fuselage added 3/32 sq pieces cabin top ribs rest upon wing rubberbanded place following construction sequence model incorporates special step-by step procedure devised Jack Instead building wing plan make two rectangles 3/8 sq balsa measure 18 X 7 glue frame three jig templatessee wing planform plan positions after butt-gluing gether sheet-balsa wing outlines outlines curved over frames see below tack-glued position enables build wing halves hands see bottom wing glue ribs place necessary fasten wing down bench workboard top wing can sanded dihedral glued wing still frames Smear center-line joint several coats glue HL glider wing outlines notched 1/16 wide 1/8 deep LE IE sprayed alcohol before bending over frames Dihedral 2/4 under tip before covering 36 wing ribs cut previously described usingthe ply template As shown plan stretch piece thread spanwise across templates glued forms cutting ribs mark sheet balsa described previ ously mark remains ribs cut out aligned thread trim front rear ends rib fit its station Murray noted original article ribs turned over placing outline trimming trimming can done easily accurately Fuselage bit tricky Murray built originalweve added few sug April 197741 Murrays airplanes distinguished not-often-seen wing design curved dihedral rather like todays Hobie Hawk sailplaneand elliptical sheet-balsa planform replica based upon MAN 1940 plans beautifully built Jack Florenzie No spars used deeply-cambered wing Taut covering adds todihedralsee sketch plan gestions After assembling fuselage sides bench normal manner joining sides built upper cabin portion air Note front view 1/16-in cabin brace visible semi-circular line indicates probably removed surplus ma terial after brace place cementing brace place first easier locate two front cabin up right pieceswhich can glued against brace suggest might add similar cabin braces perhaps did same manner across ship between up right cross pieces appear win dow area rear cabin suggested locatebe careful exact fitthe front rearmost cabin uprights first glue top cabin longerons finally insert window cross pieces plans show 1/16 ply top cowl piecenote double curvature side view would difficult impossible Make straight-line cowl shown pictures model Most modern modelers somewhat baffled stick-and-tissue construction way life old-timers especially comes assembling fuselage sides joining together cross pieces So try way Over side view lay piece Saran Wrap prevent glue sticking frame bench Wax paper reacts cellu lose cements Pin down top longeron bottom window line shaped fuse lage bottom piece Dont drive pins through longeron pieces locate snug against side wood Locate pins adjacent spots cross pieces insert out way actual joint Cement bottom longeron formed piece pin place Cut side-view cross pieces fit snug ly force-fit using cement like Ambroid glue like Elmers remove cross pieces time place small dab glue ends piece touch piece longeron intended joints slide cross pieces posi tion Perhaps things like Hot Stuff use precise fits place little glue joint removing cross piece Capillary action does rest dry remove pins lay another piece Saran Wrap over work assemble second side over first same manner join sides note fuselage narrower bottom window level Fortunately sides parallel foremost bulk head 1-B trailing edge station makes things easier Glue former 1-B both sides using pins hold alignment glue place cross piece between top longerons trailing edge station OK run holding pins through longerons Before dry install bottom cross piece station immediately aft curved bottom fuse lage piece Before dries turn Continued page 95 42 Model Aviation Secret good covering job neat final appearance painstaking sanding Straight dihedral built incovering does rest ribs sliced using template provided inserted sheet balsa outline bent over wing-jig templates fastened plan Original held two 1940 records cut perimeter give clearance ribs attach outline expanded view Fig 1 Careful work allows wing stab essentially identical previous ones except chance tentional variations wood thickness grade use form first shape curved portions outline wrap ping moist balsa strips proper size around identically shaped tip form baking oven set low heat Straight portions outline laid place straight pins holding against form Fig 2 shows delicate strips held placenever pin through wood Use angle splice Fig 3 join curved portions straight sec tions using care avoid glueing strips form Finally ribs cut exact length glued place Variations Theme compression ribs Fig 4 used form must slotted entire length rib shown Fig 5 dark lines appear between solid rib supports jig shown Fig 5 used both building wing covering solid ribs support standard ribs during covering opera tion prevent pressure micro film distorting ribs Another vari ation shown Fig 6 Easy B jig al lows wing built dihedral already installed covered wing posts attached slot supporting frame allows posts visually aligned similar arrangement can used bracingwhich would allow wing completed before ever removed work surface very careful work extremely accurate con struction wings can made Bud Tenny P 0 Box 545 Richardson TX 75080 Answer Continued page 43 fuselage upside down bench check its alignment Weigh down much necessary hold true against surface put weight top longerons nearest bench Other cross pieces forward TE station now inserted dry sides pulled together rear cementednote beveled joint important accurately make sure rest top fuselage plan tail joint centerline correct before cement dries remaining top bottom cross pieces now cut length glued place upper part cabin tricky said before some suggestions given Stringers should hard balsa prevent unsightly bowing shrinkage covering r FOR SHARK 60 OWNERS. Stahl design see tocal hobby dealer - 4 RUBBER & CO2 OGA *109 und AWINNERAT THE 5OIhNATS V t 4Oyeors ago Send tree brochure 10% FOR PACKING AND POSTAGE VA RESIDENTS ADD 4% TAD 22 I/2 WINGSPAN 6695 nose block pieces should glued place before final shaping Just sure true sand rear front faces pieces before commit yourself Start side blocks see comment below engine installation glue projecting top longeron bulkhead 1-B glue front block finally bottom block Note first trimmed fit inside surface some what cut away lightness before located engine mounting differs original model beam mounts Since engine mounted well forward FLYLINE 10643 ASHBY FL MODELS FAIRFAX VA 22030 front cabin bulkhead small ply wood firewall cut out per plans located means two balsa rectan gular pieces grain fore aft shown Blind nuts make easy bolt engine place remove make thrustline adjustments placing thin washers metal shims between case fire wallaccording adjustment needs would well coat interior engine compartment epoxy protect absorbing fuel exhaust wastes Covering Important note skele ton photos show straight dihedral finished wing has elliptical dihedral April 1977 95 O3 Notr novice flyers RO PRODUCTS INCORPORATED 480 Benner Read Waucenda IllInels 60084 USA 24 l/2 WINGSPAN 28 WINGSPAN S6 Doping final covering will auto matically impart curvature youd like specific measurement wing half has 2/4 inches dihedral panels first joined together after covering shrinks tips should have 4 43/4 inches dihedral also important covering material adhered rib both top bottom wing Moisten paper first light sprayjust enough make damp will have stick covering lower sides rib anyway order retain camber adhering paper top surface material will pull away ribs tips bow position Covering may either Japanese tissue lightweight Silkspan former ade quate perhaps bit easier work live area punctures likely Silkspan may preferred balsa surfaces come contact covering given two coats full strength dope sanding down fuzz after first coat brushing coats dope thin dope 50-50 Use coats needed fill stretch material case wing enough its top surface bow its final elliptical shape Finally brush two coats low-shrink dopesuch Sig sure covering filled taut before applying low-shrink dope because will provide further shrinking have wrinkles stage will remain Wed interested make out send us some pictures writing advertisers mention read about MA ADVERTISERS INDEX Ace Radio Control Inc79 Andrews Aircraft Model Co88 Coverite94 Cox Hobbies92 Du-Bro Products Inc94 95 Flyline Models95 Fox Mfg Company5 Fusite Emerson Electric Co93 Carl Goldberg Models16 Grish Brothers86 Paul K Guillow Inc83 Harrys Hobbies Inc86 K&BMfg3 Kraft Great Lakes87 MACShow89 Midwest Products Company4 Pactra Industries Inc85 Peck-Polymers85 Polks Hobby Dept Stores .. 8890 Progress Mfg Company82 SC Modeler Hobby Shop80 Sig Mfg Company1 Sterling Models Inc90 Sullivan Products Inc84 Toledo Weak Signals Show91 Westport International81 Williams Brothers80 World EnginesBack Cover WRAM Show 197792 96 Model Aviation
Edition: Model Aviation - 1977/04
Page Numbers: 40, 41, 42, 95, 96
iHE BY THE LATE 1930s Gordon Scotty Murray become well-known eastern free-flight competition series fine flying designs masterpiecefor old timers remember himwas Answer also known Topper latter being kit Answer published Model Airplane News August 1940 Murray distinguished use cleverly designed wing unusual both its method construction aerody namic features thin-sectioned heavily under-cambered elliptical dihedral planform Structurally consisted sheet-balsa outline frame fastened assembly templates attached work surface Its unusual aspect after incor porating certain amount straight di hedral Murray relied shrinkage covering bend panels progressively up towards tips works very well unique ship did have superior per formanceone resaons re vived used up 19 engines Class models 20 30 Class B its first outing won major meet established 1940 record several times done over 5 minutes Class C version Dennymite set another record 836 Murray wrote ship combined high lift efficiency Say what will has proved satisfaction critical build ers wing really has stuff model scaled 02 power inas much good ships Replica Old Timer classification much demand pleasant size build fly wish RC Assist has flown Ace equipment including singleended Baby actuator control system loosely described pulse rudder Al though rudder wiggles back forth response transmitted pulses its average position determined posi tion transmitter stick can use lightweight multi-channel systemsuch Cannonif wish additional controls Since airplane undoubtedly will built have requisite ex perience have attempted prepare ~now glue this' type articlewhich such builders probably ignore anyway course Scotty being us have no author fitting leave way order present plans pictures Jack Florenzie undertook con struction sample goes saying did competent job wing course requires com mentary some other points may obvious offhand Wing Because wing distinctive feature shipand built differently anything average free fighters experiencewe shall tackle first shall describe first method detailed Murray original MAN article improved procedure followed Jack Florenzie making 02 version MA Both methods basically same can build either way Jacks method allows building wing hand pinning down makes easier butt panels together dihedral Basically first step cut wing outline pieces V8 X 3 sheet balsa model shown plan Florenzie foundthat wing quite strong therefore very soft sheet can used wing outline pieces butt-glued together shown wing planform pinning pieces down drawing form camber wing panel Murray first fastened down plan three jig templates shown wing 40 Model Aviation Scotty Murrays famous 1940 design makes ideal 02-powered Replica Old-Timerfly either free flight RC Assist plan first drawn line spanwise root tip one-third chord line line afterwards aided lining up high point rib inserted upper lefthand corner plan will find wing-rib-and-building-jig template lower left corner will note positions three jig templates drawn under wing panel spanwise line mentioned about later Murray another cute trick cut 36 identical ribs using top curve template ribs same thickness depth sheet outlines slightly larger sanded later 1/8 panel template dropped 1/8 model after cutting top camber cut undercamber rib did make rib highpoints co incide spanwise line draw ing first measured end sheet balsa distance TE highpoint rib square marked pencil line across sheet trim rib proper length laid rib over sheet-balsa panel outline mark directly over spanwise line drawn plan course necessary keep marking sheet balsa used up cut ting ribs make sheet-balsa panel outline maintain airfoil shape soaked sheet water before pinning place templates already attached plan joined two panels di hedral cemented 1/16 ply tem plate underside wing reenforcement center trimmed material fit glue dried used gauze reenforce center joint Neither original plan Murrays structions made clear wing rested fuselage topthere no indication bottom wing cabin area sheet covered So making 02 version Florenzie located two flat-bottomed ribs 3/32 sheet coincide lengthwise cabin pieces fuselage added 3/32 sq pieces cabin top ribs rest upon wing rubberbanded place following construction sequence model incorporates special step-by step procedure devised Jack Instead building wing plan make two rectangles 3/8 sq balsa measure 18 X 7 glue frame three jig templatessee wing planform plan positions after butt-gluing gether sheet-balsa wing outlines outlines curved over frames see below tack-glued position enables build wing halves hands see bottom wing glue ribs place necessary fasten wing down bench workboard top wing can sanded dihedral glued wing still frames Smear center-line joint several coats glue HL glider wing outlines notched 1/16 wide 1/8 deep LE IE sprayed alcohol before bending over frames Dihedral 2/4 under tip before covering 36 wing ribs cut previously described usingthe ply template As shown plan stretch piece thread spanwise across templates glued forms cutting ribs mark sheet balsa described previ ously mark remains ribs cut out aligned thread trim front rear ends rib fit its station Murray noted original article ribs turned over placing outline trimming trimming can done easily accurately Fuselage bit tricky Murray built originalweve added few sug April 197741 Murrays airplanes distinguished not-often-seen wing design curved dihedral rather like todays Hobie Hawk sailplaneand elliptical sheet-balsa planform replica based upon MAN 1940 plans beautifully built Jack Florenzie No spars used deeply-cambered wing Taut covering adds todihedralsee sketch plan gestions After assembling fuselage sides bench normal manner joining sides built upper cabin portion air Note front view 1/16-in cabin brace visible semi-circular line indicates probably removed surplus ma terial after brace place cementing brace place first easier locate two front cabin up right pieceswhich can glued against brace suggest might add similar cabin braces perhaps did same manner across ship between up right cross pieces appear win dow area rear cabin suggested locatebe careful exact fitthe front rearmost cabin uprights first glue top cabin longerons finally insert window cross pieces plans show 1/16 ply top cowl piecenote double curvature side view would difficult impossible Make straight-line cowl shown pictures model Most modern modelers somewhat baffled stick-and-tissue construction way life old-timers especially comes assembling fuselage sides joining together cross pieces So try way Over side view lay piece Saran Wrap prevent glue sticking frame bench Wax paper reacts cellu lose cements Pin down top longeron bottom window line shaped fuse lage bottom piece Dont drive pins through longeron pieces locate snug against side wood Locate pins adjacent spots cross pieces insert out way actual joint Cement bottom longeron formed piece pin place Cut side-view cross pieces fit snug ly force-fit using cement like Ambroid glue like Elmers remove cross pieces time place small dab glue ends piece touch piece longeron intended joints slide cross pieces posi tion Perhaps things like Hot Stuff use precise fits place little glue joint removing cross piece Capillary action does rest dry remove pins lay another piece Saran Wrap over work assemble second side over first same manner join sides note fuselage narrower bottom window level Fortunately sides parallel foremost bulk head 1-B trailing edge station makes things easier Glue former 1-B both sides using pins hold alignment glue place cross piece between top longerons trailing edge station OK run holding pins through longerons Before dry install bottom cross piece station immediately aft curved bottom fuse lage piece Before dries turn Continued page 95 42 Model Aviation Secret good covering job neat final appearance painstaking sanding Straight dihedral built incovering does rest ribs sliced using template provided inserted sheet balsa outline bent over wing-jig templates fastened plan Original held two 1940 records cut perimeter give clearance ribs attach outline expanded view Fig 1 Careful work allows wing stab essentially identical previous ones except chance tentional variations wood thickness grade use form first shape curved portions outline wrap ping moist balsa strips proper size around identically shaped tip form baking oven set low heat Straight portions outline laid place straight pins holding against form Fig 2 shows delicate strips held placenever pin through wood Use angle splice Fig 3 join curved portions straight sec tions using care avoid glueing strips form Finally ribs cut exact length glued place Variations Theme compression ribs Fig 4 used form must slotted entire length rib shown Fig 5 dark lines appear between solid rib supports jig shown Fig 5 used both building wing covering solid ribs support standard ribs during covering opera tion prevent pressure micro film distorting ribs Another vari ation shown Fig 6 Easy B jig al lows wing built dihedral already installed covered wing posts attached slot supporting frame allows posts visually aligned similar arrangement can used bracingwhich would allow wing completed before ever removed work surface very careful work extremely accurate con struction wings can made Bud Tenny P 0 Box 545 Richardson TX 75080 Answer Continued page 43 fuselage upside down bench check its alignment Weigh down much necessary hold true against surface put weight top longerons nearest bench Other cross pieces forward TE station now inserted dry sides pulled together rear cementednote beveled joint important accurately make sure rest top fuselage plan tail joint centerline correct before cement dries remaining top bottom cross pieces now cut length glued place upper part cabin tricky said before some suggestions given Stringers should hard balsa prevent unsightly bowing shrinkage covering r FOR SHARK 60 OWNERS. Stahl design see tocal hobby dealer - 4 RUBBER & CO2 OGA *109 und AWINNERAT THE 5OIhNATS V t 4Oyeors ago Send tree brochure 10% FOR PACKING AND POSTAGE VA RESIDENTS ADD 4% TAD 22 I/2 WINGSPAN 6695 nose block pieces should glued place before final shaping Just sure true sand rear front faces pieces before commit yourself Start side blocks see comment below engine installation glue projecting top longeron bulkhead 1-B glue front block finally bottom block Note first trimmed fit inside surface some what cut away lightness before located engine mounting differs original model beam mounts Since engine mounted well forward FLYLINE 10643 ASHBY FL MODELS FAIRFAX VA 22030 front cabin bulkhead small ply wood firewall cut out per plans located means two balsa rectan gular pieces grain fore aft shown Blind nuts make easy bolt engine place remove make thrustline adjustments placing thin washers metal shims between case fire wallaccording adjustment needs would well coat interior engine compartment epoxy protect absorbing fuel exhaust wastes Covering Important note skele ton photos show straight dihedral finished wing has elliptical dihedral April 1977 95 O3 Notr novice flyers RO PRODUCTS INCORPORATED 480 Benner Read Waucenda IllInels 60084 USA 24 l/2 WINGSPAN 28 WINGSPAN S6 Doping final covering will auto matically impart curvature youd like specific measurement wing half has 2/4 inches dihedral panels first joined together after covering shrinks tips should have 4 43/4 inches dihedral also important covering material adhered rib both top bottom wing Moisten paper first light sprayjust enough make damp will have stick covering lower sides rib anyway order retain camber adhering paper top surface material will pull away ribs tips bow position Covering may either Japanese tissue lightweight Silkspan former ade quate perhaps bit easier work live area punctures likely Silkspan may preferred balsa surfaces come contact covering given two coats full strength dope sanding down fuzz after first coat brushing coats dope thin dope 50-50 Use coats needed fill stretch material case wing enough its top surface bow its final elliptical shape Finally brush two coats low-shrink dopesuch Sig sure covering filled taut before applying low-shrink dope because will provide further shrinking have wrinkles stage will remain Wed interested make out send us some pictures writing advertisers mention read about MA ADVERTISERS INDEX Ace Radio Control Inc79 Andrews Aircraft Model Co88 Coverite94 Cox Hobbies92 Du-Bro Products Inc94 95 Flyline Models95 Fox Mfg Company5 Fusite Emerson Electric Co93 Carl Goldberg Models16 Grish Brothers86 Paul K Guillow Inc83 Harrys Hobbies Inc86 K&BMfg3 Kraft Great Lakes87 MACShow89 Midwest Products Company4 Pactra Industries Inc85 Peck-Polymers85 Polks Hobby Dept Stores .. 8890 Progress Mfg Company82 SC Modeler Hobby Shop80 Sig Mfg Company1 Sterling Models Inc90 Sullivan Products Inc84 Toledo Weak Signals Show91 Westport International81 Williams Brothers80 World EnginesBack Cover WRAM Show 197792 96 Model Aviation