ii myd SM92 made its debut FAC its waswithg comments picture-taking wards several months research construction rids asked plans construction tips Savoia-Marchetti SM92 its sister ship SM91 empts part Italian engineers take advantage Therent power redundancy twin power plants make mely fast deadly escort fighter seems have common nations during WW II effort met failure often success well-known failure design philosophy least conventional day fighter Messerschmitt Bf 110 Lockheed P-38 ranks among relatively few successful twin-engined fighters fact SM92 refined version SM91 eliminated central crew nacelle favor elongated 'greenhouse~ two fuselages Only SM92 constructed flown 1943 under German sponsorship proved relatively fast nearly 400 mph heavily armed escort fighter time circumstances passed Only extraordinary aircraft could have justified mechanical complexity appetite scarce Daimler-Benz DB 605 engines required SM92 Although never saw production SM92 provides excellent basis rubberpowered model became aware SM92 flying model its designer Lubomir Koutny sent photos second construction article weve collaborated SM92 seemed have everything going Most twins relatively long engine nacelles have much way duration due short lengths rubber motors Only extremely skilled builder flier can get such model perform well average modeler inherent limitations some might say inefficiencies twin subjects require considerable patience Models aircraft twin-boom twin-fuselage configuration have motor-length advantages have short nose moments demand lots nose weight downthrust proper flight SM92 has long fuselages reasonably long nose moments However fuselages close enough another restrict prop diametera point noted later Koutnys model built plug-in outer wing panels make easier transport allow clearance rubber within midwing design set out build model dispensed feature save weight simplify construction plans also modified incorporate wing saddle revised wing spars allow rubber clearance plans photos show Italian markings appropriate era craft constructed model dispensed plug-in landing gear since FAC rules permit gear retracted position same rules require flat-bottomed airfoils unless real plane undercamber did plans also show English rather metric dimensions CONSTRUCTION Wing wing built three units center section two outer panels wing spars must strongparticularly curved center section center section spars cut laminate 1/16 balsa faced either side 1/64 plywood Elmers glue used make sandwiched material wing ribs sliced type Make up /64 ply template wing cross section plan use cut lots 1/16 sheet balsa ribs wing may appear overbuilt appears plan actually very light strong structure Lay down wing tips leading trailing edges /is square lengths along rib locations Glue spars top curved sliced ribs Always cut away excess stock ribs trailing edges fit tapering outline Prop up outer panel 2/8 inches glue center section add gussets desired wing formers WF-l September 1994 51 SM92 regularly flies 50-65 seconds two 27-inch loops /e FAI rubber Model weighs 68 grams less rubber Outer wing panels Koutnys model detachable author modified wing attachment per plans Bamboo Basswood Block Dairy Container Blade Brass Tube Freewheeler Hollow Balsa Spinner Grommet hold stop wire WF-2 latter essential strengthening structure permitting eventual passage rubber motor through midwing position also good idea strengthen joints outer panel center panel spars meet some carbon fiber Tyvek cut common Tyvek mailing envelope Fuselages The fuselages identical Although built using familiar half-shell construction technique stringers follow Czech practice laying down many narrow 1/20 square stringers directly atop formers Except former 1 formers notched technique produces light strong fuselage smooth contours Transfer former patterns balsa being sure mark main stringer locations Begin fuselage pinning down upper lower keels laminate two 1/16 stringersGlue formers keels checking frequently assure square work surface first stringer should follow centerline add main stringer locations frequently checking avoid waviness Glue wing saddle add stringers between main locations study detailed plan former 2 dry remove completed fuselage half plan add complementary former halves wing saddle stringers good idea fill sheet between stringers area between formers 1 2 strengthen nose add bit structural weight area fuselage construction finished cut away former areas wing will pass Tail Surfaces built directly over plan vertical tail surfaces have outlines formed laminating two 1A6 square stringers Soak stringers hot water few drops household ammonia added rinse laminate stringers around waxed cardboard form Pin assembly building board allow dry overnight may also want add Yl6 x /32 capstrips tail surfaces added strength rigidity must sanded thin symmetrical crosssection before covering Color Markings Details Aside few black-and-white photos little could found regarding markings aircraft plan shows Italian livery approximately 1943 craft also flown German markings upper surfaces likely forest green Pactra Cessna gray Paint sprayed onto covered clear-doped model artists mouth atomizer spray several light coats rather thick color separation line straight making masking drafting tape quite easy white fuselage bands tail crosses created masking off areas drafting tape before spraying allowed underlying white tissue remain exposed locations black wing insignia sprayed through carefully cut adhesive-backed masks black tissue insignia would also work Note stylized blades wing insignia face outboard various scoops radiators made carved hollowed balsa tail fairing rearward-firing cannon muzzle tail wheel affixed also made hollow balsa block Applying some matte black paint finished scoop radiator intakes adds nice touch realism models cockpit somewhat less detailed Koutnys because did want weaken structure area fuselage cutting away clear canopy vacuum formed Preparing flight recommend two-bladed plastic propellers model part aesthetic reasons eight-inch props shown model employ modified cottage cheese container blades Once blades cut 1/ slot cut along blade centerline Spars made 1/ diameter bamboo cocktail skewers notch carefully cut 52 Model Aviation r plastic canopy vacuum-formed Authors model has less-detailed cockpit added strength area moment truth prop-holding device has pulled free see left hand model its way Launch Technique Wire owel -Line Full-Size Plans AvailableSee Page 160 ffIIIliiiI -r 4 Ii ~liIl II II II II II IL Di Juw K K --0 6 x/A & *Aw*-NaR#Ern fM N N spar spar notch engages prop blade end blade slot prevents separation blade held spar RC-56 glue blades glued triangular basswood block has brass-tubing freewheeler center simple assembly jig necessary assure blades set proper pitch diameter prop assembly lightly glued hollow balsa spinner props left- right-handed will rotate outward during power Although rule thumb prop diameter should about one-third wingspan relatively small props SM92 proved adequate job blades set 14 pitch/diameter ratio Ive found fuselages can securely held winding stooge additional help Alas also discovered hard way winding tube necessary prevent damage inevitable exploded motor first twin work slowly methodically until get hang winding launching model model has small brass grommet inconspicuously embedded fuselage beneath prop assembly simple stop device made length dowel 10 inches nylon line secured end 025 music wire pins firmly attached line first prop fully wound winding tube extracted prop assembly coupled motor seated fuselage metal pins inserted fuselage grommet allowed protrude thus preventing prop unwinding second prop stopped like manner second pin moment launch dowel moved forward pulling smoothly nylon lines pulls pins free grommets allows props turn under power SM92 very easy trim needing bit clay nose modest amount downthrust flew well almost oncesurprising such complex subject graceful stately flier regularly clocks flights 50 65 seconds Koutnys model swept recent Czech Scale season regularly putting times excess 70 seconds model weighs 68 grams rubber ballast powered two 27 inch loops /s FAI rubber fuselage ember 1994 53 I11F1l [I II II / / Type FE Rubber Scale Wingspan 361/2 inches Rubber motors 27-inch loops 1/8 FAI Flying weight 68 grams less rubber Construction Stick-and-tissue Covering/finish Japanese tissue clear color dope
Edition: Model Aviation - 1994/09
Page Numbers: 49, 51, 52, 53
ii myd SM92 made its debut FAC its waswithg comments picture-taking wards several months research construction rids asked plans construction tips Savoia-Marchetti SM92 its sister ship SM91 empts part Italian engineers take advantage Therent power redundancy twin power plants make mely fast deadly escort fighter seems have common nations during WW II effort met failure often success well-known failure design philosophy least conventional day fighter Messerschmitt Bf 110 Lockheed P-38 ranks among relatively few successful twin-engined fighters fact SM92 refined version SM91 eliminated central crew nacelle favor elongated 'greenhouse~ two fuselages Only SM92 constructed flown 1943 under German sponsorship proved relatively fast nearly 400 mph heavily armed escort fighter time circumstances passed Only extraordinary aircraft could have justified mechanical complexity appetite scarce Daimler-Benz DB 605 engines required SM92 Although never saw production SM92 provides excellent basis rubberpowered model became aware SM92 flying model its designer Lubomir Koutny sent photos second construction article weve collaborated SM92 seemed have everything going Most twins relatively long engine nacelles have much way duration due short lengths rubber motors Only extremely skilled builder flier can get such model perform well average modeler inherent limitations some might say inefficiencies twin subjects require considerable patience Models aircraft twin-boom twin-fuselage configuration have motor-length advantages have short nose moments demand lots nose weight downthrust proper flight SM92 has long fuselages reasonably long nose moments However fuselages close enough another restrict prop diametera point noted later Koutnys model built plug-in outer wing panels make easier transport allow clearance rubber within midwing design set out build model dispensed feature save weight simplify construction plans also modified incorporate wing saddle revised wing spars allow rubber clearance plans photos show Italian markings appropriate era craft constructed model dispensed plug-in landing gear since FAC rules permit gear retracted position same rules require flat-bottomed airfoils unless real plane undercamber did plans also show English rather metric dimensions CONSTRUCTION Wing wing built three units center section two outer panels wing spars must strongparticularly curved center section center section spars cut laminate 1/16 balsa faced either side 1/64 plywood Elmers glue used make sandwiched material wing ribs sliced type Make up /64 ply template wing cross section plan use cut lots 1/16 sheet balsa ribs wing may appear overbuilt appears plan actually very light strong structure Lay down wing tips leading trailing edges /is square lengths along rib locations Glue spars top curved sliced ribs Always cut away excess stock ribs trailing edges fit tapering outline Prop up outer panel 2/8 inches glue center section add gussets desired wing formers WF-l September 1994 51 SM92 regularly flies 50-65 seconds two 27-inch loops /e FAI rubber Model weighs 68 grams less rubber Outer wing panels Koutnys model detachable author modified wing attachment per plans Bamboo Basswood Block Dairy Container Blade Brass Tube Freewheeler Hollow Balsa Spinner Grommet hold stop wire WF-2 latter essential strengthening structure permitting eventual passage rubber motor through midwing position also good idea strengthen joints outer panel center panel spars meet some carbon fiber Tyvek cut common Tyvek mailing envelope Fuselages The fuselages identical Although built using familiar half-shell construction technique stringers follow Czech practice laying down many narrow 1/20 square stringers directly atop formers Except former 1 formers notched technique produces light strong fuselage smooth contours Transfer former patterns balsa being sure mark main stringer locations Begin fuselage pinning down upper lower keels laminate two 1/16 stringersGlue formers keels checking frequently assure square work surface first stringer should follow centerline add main stringer locations frequently checking avoid waviness Glue wing saddle add stringers between main locations study detailed plan former 2 dry remove completed fuselage half plan add complementary former halves wing saddle stringers good idea fill sheet between stringers area between formers 1 2 strengthen nose add bit structural weight area fuselage construction finished cut away former areas wing will pass Tail Surfaces built directly over plan vertical tail surfaces have outlines formed laminating two 1A6 square stringers Soak stringers hot water few drops household ammonia added rinse laminate stringers around waxed cardboard form Pin assembly building board allow dry overnight may also want add Yl6 x /32 capstrips tail surfaces added strength rigidity must sanded thin symmetrical crosssection before covering Color Markings Details Aside few black-and-white photos little could found regarding markings aircraft plan shows Italian livery approximately 1943 craft also flown German markings upper surfaces likely forest green Pactra Cessna gray Paint sprayed onto covered clear-doped model artists mouth atomizer spray several light coats rather thick color separation line straight making masking drafting tape quite easy white fuselage bands tail crosses created masking off areas drafting tape before spraying allowed underlying white tissue remain exposed locations black wing insignia sprayed through carefully cut adhesive-backed masks black tissue insignia would also work Note stylized blades wing insignia face outboard various scoops radiators made carved hollowed balsa tail fairing rearward-firing cannon muzzle tail wheel affixed also made hollow balsa block Applying some matte black paint finished scoop radiator intakes adds nice touch realism models cockpit somewhat less detailed Koutnys because did want weaken structure area fuselage cutting away clear canopy vacuum formed Preparing flight recommend two-bladed plastic propellers model part aesthetic reasons eight-inch props shown model employ modified cottage cheese container blades Once blades cut 1/ slot cut along blade centerline Spars made 1/ diameter bamboo cocktail skewers notch carefully cut 52 Model Aviation r plastic canopy vacuum-formed Authors model has less-detailed cockpit added strength area moment truth prop-holding device has pulled free see left hand model its way Launch Technique Wire owel -Line Full-Size Plans AvailableSee Page 160 ffIIIliiiI -r 4 Ii ~liIl II II II II II IL Di Juw K K --0 6 x/A & *Aw*-NaR#Ern fM N N spar spar notch engages prop blade end blade slot prevents separation blade held spar RC-56 glue blades glued triangular basswood block has brass-tubing freewheeler center simple assembly jig necessary assure blades set proper pitch diameter prop assembly lightly glued hollow balsa spinner props left- right-handed will rotate outward during power Although rule thumb prop diameter should about one-third wingspan relatively small props SM92 proved adequate job blades set 14 pitch/diameter ratio Ive found fuselages can securely held winding stooge additional help Alas also discovered hard way winding tube necessary prevent damage inevitable exploded motor first twin work slowly methodically until get hang winding launching model model has small brass grommet inconspicuously embedded fuselage beneath prop assembly simple stop device made length dowel 10 inches nylon line secured end 025 music wire pins firmly attached line first prop fully wound winding tube extracted prop assembly coupled motor seated fuselage metal pins inserted fuselage grommet allowed protrude thus preventing prop unwinding second prop stopped like manner second pin moment launch dowel moved forward pulling smoothly nylon lines pulls pins free grommets allows props turn under power SM92 very easy trim needing bit clay nose modest amount downthrust flew well almost oncesurprising such complex subject graceful stately flier regularly clocks flights 50 65 seconds Koutnys model swept recent Czech Scale season regularly putting times excess 70 seconds model weighs 68 grams rubber ballast powered two 27 inch loops /s FAI rubber fuselage ember 1994 53 I11F1l [I II II / / Type FE Rubber Scale Wingspan 361/2 inches Rubber motors 27-inch loops 1/8 FAI Flying weight 68 grams less rubber Construction Stick-and-tissue Covering/finish Japanese tissue clear color dope
Edition: Model Aviation - 1994/09
Page Numbers: 49, 51, 52, 53
ii myd SM92 made its debut FAC its waswithg comments picture-taking wards several months research construction rids asked plans construction tips Savoia-Marchetti SM92 its sister ship SM91 empts part Italian engineers take advantage Therent power redundancy twin power plants make mely fast deadly escort fighter seems have common nations during WW II effort met failure often success well-known failure design philosophy least conventional day fighter Messerschmitt Bf 110 Lockheed P-38 ranks among relatively few successful twin-engined fighters fact SM92 refined version SM91 eliminated central crew nacelle favor elongated 'greenhouse~ two fuselages Only SM92 constructed flown 1943 under German sponsorship proved relatively fast nearly 400 mph heavily armed escort fighter time circumstances passed Only extraordinary aircraft could have justified mechanical complexity appetite scarce Daimler-Benz DB 605 engines required SM92 Although never saw production SM92 provides excellent basis rubberpowered model became aware SM92 flying model its designer Lubomir Koutny sent photos second construction article weve collaborated SM92 seemed have everything going Most twins relatively long engine nacelles have much way duration due short lengths rubber motors Only extremely skilled builder flier can get such model perform well average modeler inherent limitations some might say inefficiencies twin subjects require considerable patience Models aircraft twin-boom twin-fuselage configuration have motor-length advantages have short nose moments demand lots nose weight downthrust proper flight SM92 has long fuselages reasonably long nose moments However fuselages close enough another restrict prop diametera point noted later Koutnys model built plug-in outer wing panels make easier transport allow clearance rubber within midwing design set out build model dispensed feature save weight simplify construction plans also modified incorporate wing saddle revised wing spars allow rubber clearance plans photos show Italian markings appropriate era craft constructed model dispensed plug-in landing gear since FAC rules permit gear retracted position same rules require flat-bottomed airfoils unless real plane undercamber did plans also show English rather metric dimensions CONSTRUCTION Wing wing built three units center section two outer panels wing spars must strongparticularly curved center section center section spars cut laminate 1/16 balsa faced either side 1/64 plywood Elmers glue used make sandwiched material wing ribs sliced type Make up /64 ply template wing cross section plan use cut lots 1/16 sheet balsa ribs wing may appear overbuilt appears plan actually very light strong structure Lay down wing tips leading trailing edges /is square lengths along rib locations Glue spars top curved sliced ribs Always cut away excess stock ribs trailing edges fit tapering outline Prop up outer panel 2/8 inches glue center section add gussets desired wing formers WF-l September 1994 51 SM92 regularly flies 50-65 seconds two 27-inch loops /e FAI rubber Model weighs 68 grams less rubber Outer wing panels Koutnys model detachable author modified wing attachment per plans Bamboo Basswood Block Dairy Container Blade Brass Tube Freewheeler Hollow Balsa Spinner Grommet hold stop wire WF-2 latter essential strengthening structure permitting eventual passage rubber motor through midwing position also good idea strengthen joints outer panel center panel spars meet some carbon fiber Tyvek cut common Tyvek mailing envelope Fuselages The fuselages identical Although built using familiar half-shell construction technique stringers follow Czech practice laying down many narrow 1/20 square stringers directly atop formers Except former 1 formers notched technique produces light strong fuselage smooth contours Transfer former patterns balsa being sure mark main stringer locations Begin fuselage pinning down upper lower keels laminate two 1/16 stringersGlue formers keels checking frequently assure square work surface first stringer should follow centerline add main stringer locations frequently checking avoid waviness Glue wing saddle add stringers between main locations study detailed plan former 2 dry remove completed fuselage half plan add complementary former halves wing saddle stringers good idea fill sheet between stringers area between formers 1 2 strengthen nose add bit structural weight area fuselage construction finished cut away former areas wing will pass Tail Surfaces built directly over plan vertical tail surfaces have outlines formed laminating two 1A6 square stringers Soak stringers hot water few drops household ammonia added rinse laminate stringers around waxed cardboard form Pin assembly building board allow dry overnight may also want add Yl6 x /32 capstrips tail surfaces added strength rigidity must sanded thin symmetrical crosssection before covering Color Markings Details Aside few black-and-white photos little could found regarding markings aircraft plan shows Italian livery approximately 1943 craft also flown German markings upper surfaces likely forest green Pactra Cessna gray Paint sprayed onto covered clear-doped model artists mouth atomizer spray several light coats rather thick color separation line straight making masking drafting tape quite easy white fuselage bands tail crosses created masking off areas drafting tape before spraying allowed underlying white tissue remain exposed locations black wing insignia sprayed through carefully cut adhesive-backed masks black tissue insignia would also work Note stylized blades wing insignia face outboard various scoops radiators made carved hollowed balsa tail fairing rearward-firing cannon muzzle tail wheel affixed also made hollow balsa block Applying some matte black paint finished scoop radiator intakes adds nice touch realism models cockpit somewhat less detailed Koutnys because did want weaken structure area fuselage cutting away clear canopy vacuum formed Preparing flight recommend two-bladed plastic propellers model part aesthetic reasons eight-inch props shown model employ modified cottage cheese container blades Once blades cut 1/ slot cut along blade centerline Spars made 1/ diameter bamboo cocktail skewers notch carefully cut 52 Model Aviation r plastic canopy vacuum-formed Authors model has less-detailed cockpit added strength area moment truth prop-holding device has pulled free see left hand model its way Launch Technique Wire owel -Line Full-Size Plans AvailableSee Page 160 ffIIIliiiI -r 4 Ii ~liIl II II II II II IL Di Juw K K --0 6 x/A & *Aw*-NaR#Ern fM N N spar spar notch engages prop blade end blade slot prevents separation blade held spar RC-56 glue blades glued triangular basswood block has brass-tubing freewheeler center simple assembly jig necessary assure blades set proper pitch diameter prop assembly lightly glued hollow balsa spinner props left- right-handed will rotate outward during power Although rule thumb prop diameter should about one-third wingspan relatively small props SM92 proved adequate job blades set 14 pitch/diameter ratio Ive found fuselages can securely held winding stooge additional help Alas also discovered hard way winding tube necessary prevent damage inevitable exploded motor first twin work slowly methodically until get hang winding launching model model has small brass grommet inconspicuously embedded fuselage beneath prop assembly simple stop device made length dowel 10 inches nylon line secured end 025 music wire pins firmly attached line first prop fully wound winding tube extracted prop assembly coupled motor seated fuselage metal pins inserted fuselage grommet allowed protrude thus preventing prop unwinding second prop stopped like manner second pin moment launch dowel moved forward pulling smoothly nylon lines pulls pins free grommets allows props turn under power SM92 very easy trim needing bit clay nose modest amount downthrust flew well almost oncesurprising such complex subject graceful stately flier regularly clocks flights 50 65 seconds Koutnys model swept recent Czech Scale season regularly putting times excess 70 seconds model weighs 68 grams rubber ballast powered two 27 inch loops /s FAI rubber fuselage ember 1994 53 I11F1l [I II II / / Type FE Rubber Scale Wingspan 361/2 inches Rubber motors 27-inch loops 1/8 FAI Flying weight 68 grams less rubber Construction Stick-and-tissue Covering/finish Japanese tissue clear color dope
Edition: Model Aviation - 1994/09
Page Numbers: 49, 51, 52, 53
ii myd SM92 made its debut FAC its waswithg comments picture-taking wards several months research construction rids asked plans construction tips Savoia-Marchetti SM92 its sister ship SM91 empts part Italian engineers take advantage Therent power redundancy twin power plants make mely fast deadly escort fighter seems have common nations during WW II effort met failure often success well-known failure design philosophy least conventional day fighter Messerschmitt Bf 110 Lockheed P-38 ranks among relatively few successful twin-engined fighters fact SM92 refined version SM91 eliminated central crew nacelle favor elongated 'greenhouse~ two fuselages Only SM92 constructed flown 1943 under German sponsorship proved relatively fast nearly 400 mph heavily armed escort fighter time circumstances passed Only extraordinary aircraft could have justified mechanical complexity appetite scarce Daimler-Benz DB 605 engines required SM92 Although never saw production SM92 provides excellent basis rubberpowered model became aware SM92 flying model its designer Lubomir Koutny sent photos second construction article weve collaborated SM92 seemed have everything going Most twins relatively long engine nacelles have much way duration due short lengths rubber motors Only extremely skilled builder flier can get such model perform well average modeler inherent limitations some might say inefficiencies twin subjects require considerable patience Models aircraft twin-boom twin-fuselage configuration have motor-length advantages have short nose moments demand lots nose weight downthrust proper flight SM92 has long fuselages reasonably long nose moments However fuselages close enough another restrict prop diametera point noted later Koutnys model built plug-in outer wing panels make easier transport allow clearance rubber within midwing design set out build model dispensed feature save weight simplify construction plans also modified incorporate wing saddle revised wing spars allow rubber clearance plans photos show Italian markings appropriate era craft constructed model dispensed plug-in landing gear since FAC rules permit gear retracted position same rules require flat-bottomed airfoils unless real plane undercamber did plans also show English rather metric dimensions CONSTRUCTION Wing wing built three units center section two outer panels wing spars must strongparticularly curved center section center section spars cut laminate 1/16 balsa faced either side 1/64 plywood Elmers glue used make sandwiched material wing ribs sliced type Make up /64 ply template wing cross section plan use cut lots 1/16 sheet balsa ribs wing may appear overbuilt appears plan actually very light strong structure Lay down wing tips leading trailing edges /is square lengths along rib locations Glue spars top curved sliced ribs Always cut away excess stock ribs trailing edges fit tapering outline Prop up outer panel 2/8 inches glue center section add gussets desired wing formers WF-l September 1994 51 SM92 regularly flies 50-65 seconds two 27-inch loops /e FAI rubber Model weighs 68 grams less rubber Outer wing panels Koutnys model detachable author modified wing attachment per plans Bamboo Basswood Block Dairy Container Blade Brass Tube Freewheeler Hollow Balsa Spinner Grommet hold stop wire WF-2 latter essential strengthening structure permitting eventual passage rubber motor through midwing position also good idea strengthen joints outer panel center panel spars meet some carbon fiber Tyvek cut common Tyvek mailing envelope Fuselages The fuselages identical Although built using familiar half-shell construction technique stringers follow Czech practice laying down many narrow 1/20 square stringers directly atop formers Except former 1 formers notched technique produces light strong fuselage smooth contours Transfer former patterns balsa being sure mark main stringer locations Begin fuselage pinning down upper lower keels laminate two 1/16 stringersGlue formers keels checking frequently assure square work surface first stringer should follow centerline add main stringer locations frequently checking avoid waviness Glue wing saddle add stringers between main locations study detailed plan former 2 dry remove completed fuselage half plan add complementary former halves wing saddle stringers good idea fill sheet between stringers area between formers 1 2 strengthen nose add bit structural weight area fuselage construction finished cut away former areas wing will pass Tail Surfaces built directly over plan vertical tail surfaces have outlines formed laminating two 1A6 square stringers Soak stringers hot water few drops household ammonia added rinse laminate stringers around waxed cardboard form Pin assembly building board allow dry overnight may also want add Yl6 x /32 capstrips tail surfaces added strength rigidity must sanded thin symmetrical crosssection before covering Color Markings Details Aside few black-and-white photos little could found regarding markings aircraft plan shows Italian livery approximately 1943 craft also flown German markings upper surfaces likely forest green Pactra Cessna gray Paint sprayed onto covered clear-doped model artists mouth atomizer spray several light coats rather thick color separation line straight making masking drafting tape quite easy white fuselage bands tail crosses created masking off areas drafting tape before spraying allowed underlying white tissue remain exposed locations black wing insignia sprayed through carefully cut adhesive-backed masks black tissue insignia would also work Note stylized blades wing insignia face outboard various scoops radiators made carved hollowed balsa tail fairing rearward-firing cannon muzzle tail wheel affixed also made hollow balsa block Applying some matte black paint finished scoop radiator intakes adds nice touch realism models cockpit somewhat less detailed Koutnys because did want weaken structure area fuselage cutting away clear canopy vacuum formed Preparing flight recommend two-bladed plastic propellers model part aesthetic reasons eight-inch props shown model employ modified cottage cheese container blades Once blades cut 1/ slot cut along blade centerline Spars made 1/ diameter bamboo cocktail skewers notch carefully cut 52 Model Aviation r plastic canopy vacuum-formed Authors model has less-detailed cockpit added strength area moment truth prop-holding device has pulled free see left hand model its way Launch Technique Wire owel -Line Full-Size Plans AvailableSee Page 160 ffIIIliiiI -r 4 Ii ~liIl II II II II II IL Di Juw K K --0 6 x/A & *Aw*-NaR#Ern fM N N spar spar notch engages prop blade end blade slot prevents separation blade held spar RC-56 glue blades glued triangular basswood block has brass-tubing freewheeler center simple assembly jig necessary assure blades set proper pitch diameter prop assembly lightly glued hollow balsa spinner props left- right-handed will rotate outward during power Although rule thumb prop diameter should about one-third wingspan relatively small props SM92 proved adequate job blades set 14 pitch/diameter ratio Ive found fuselages can securely held winding stooge additional help Alas also discovered hard way winding tube necessary prevent damage inevitable exploded motor first twin work slowly methodically until get hang winding launching model model has small brass grommet inconspicuously embedded fuselage beneath prop assembly simple stop device made length dowel 10 inches nylon line secured end 025 music wire pins firmly attached line first prop fully wound winding tube extracted prop assembly coupled motor seated fuselage metal pins inserted fuselage grommet allowed protrude thus preventing prop unwinding second prop stopped like manner second pin moment launch dowel moved forward pulling smoothly nylon lines pulls pins free grommets allows props turn under power SM92 very easy trim needing bit clay nose modest amount downthrust flew well almost oncesurprising such complex subject graceful stately flier regularly clocks flights 50 65 seconds Koutnys model swept recent Czech Scale season regularly putting times excess 70 seconds model weighs 68 grams rubber ballast powered two 27 inch loops /s FAI rubber fuselage ember 1994 53 I11F1l [I II II / / Type FE Rubber Scale Wingspan 361/2 inches Rubber motors 27-inch loops 1/8 FAI Flying weight 68 grams less rubber Construction Stick-and-tissue Covering/finish Japanese tissue clear color dope