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Praxis

Author: T. Dixon


Edition: Model Aviation - 1995/11
Page Numbers: 56, 57, 58, 63, 64

Ft U Tom Dixon design flies face prevailing wisdom country regarding CL Stunt models does use tuned pipe has engine mounted idewinder style cylinder mounted outside flight circle Texans please write 1990-91 agent importing distribution fully 7 framed finished Skywriter models 1988-90 world champion Zhang Xiang Dong impressed Zhangs incredible workmanship approach design Skywriters built two-piece wings removable tails fit 40 x 20 x 12-inch boxes work proceeded rough out sketch make come together moments amalgam Avanti Skywriter wing mounted 3/ inch below thrustline stab thrustline Mounting wing thrustline would require leadouts exit /16-/8 toward bottom fuselage allow wings-level flying landing gear length weight muffler weight sideexhaust engine will bias vertical center gravity CU somewhat easier move wing leadouts thats wing 3/ off center looked sidemounted no-cowl nose treatment impressed its elegant simplicity natural way mount engine thrustline wing stab same center line During 1993 built Walt Pyron-designed P-39 Airacobra Classic Stunt model designed 1958 uses Fox 35 cylinder mounted outboard Fox notoriously fickle about running properly outboard-mounted cylinder however proper adjustment tank height little experimenting different plugs fuels Fox ran perfectly figured Fox worked way anything else would too about same time experimenting lots What certainly true lots speed power torque model lots -of power will maintain its speed better after tight turns will punch through turbulent air better will generally maintain line tension better under conditions F2B rules limit us 10cc 61 cubic inches engine size makes sense use size engine airframe can built correct size weight use power original 60 size models up 900 square inches wing area flew fine could real handful high winds world level 60powered models 650-680 square inches size model won World F2B Championship 1986 88 90 94 models usually weigh about 56 ounces use props 11-12 inches diameter 51/451/2 inches true pitch power Merco 61 airframe originally designed 40 45 Charisma flew very well Merco despite being overweight began feel could no such thing overpowering CL Stunt model provided wing loading within acceptable limits correct propeller used convenience ordered foam core Bob Barons Avanti design Scott Smith Avanti originally flown OS 40 45 FSR placed second 1984 World Champs As sheeted Avanti wing thought occurred mate Skywriter-style fuselage no-spinner front end would allow try variety different-length engines worrying about spinner mating up exactly So have flown observed tuned-pipe setups am convinced about claims made increased power constant speed true cost complexity double conventional four-strokeWhere possible lower diameter used three blade configuration smaller diameter can use still have adequate thrust overhead line tension better Diameter can cause precession problems increases leading instability lack groove major problems piped models high rpm use prop mass becomes significant gyroscope gust wind yaws model also causes pitch up down due 900 effects precession lower rpm traditional setups largely negates problem youve seen pipe models lump around bounce out bottoms maneuvers often cause high-energy gyroscope high-rpm prop culprit wiggling rudder cannot offset forces associated effect Keeping rpm prop diameter low practical helps lot Praxis cobbled up practical easy build maintain model using traditional 60 power either Merco 61 SuperTigre 60 Several new engines can also used including ST 60 copy Double Star Moldova Discovery engines Ukraine kept light Praxis will perform well ST 51 RoyalIOS 46s However aint no substitute cubic inches November1995 57 am E0t rf4zed i*0dd4 eaaed -Tom Dixon mu flOtOS ne author Uraphlc ueslgn Heather Erdahi Author 10-year-old son Steven prepare startup Steven seasoned mechanic & budding flier z4 Type CL Stunt Wingspan 59 inches Engine sizeltype Merco 61 Hying weight 46 ounces Construction Sheet & foam Covering/finish Silkspan dope wing stab fiberglass epoxy dope fuselage fin CONSTRUCTION nothing especially difficult about construction model youve ever built full-bodied competition stunter Nonetheless will cover few points less-experienced builders Wing The wing can built-up foam cases built-up wing will two ounces lighter Begin wing construction sandwiching rib blanks between plywood templates carving sanding shape Repeat opposite wing Dont worry too much about bevel ribs glue will allow adequate strength contact sheeting prefer use Adjusto-Jig built-up wings wing can built flat surface such hollow door care taken shim spars maintain true shape entire span foam wing can ordered bare core completely sheeted Aerosmith Aviation Contact Scott Smith details sheeted core myself using nating epoxy adhesive sheeted panels should weigh 31/2 4 ounces per panel optimum performance four-inch bellerank Dan Winship best Ive ever seen Control horns 1/g wire manufactured Robin Hiern Melbourne Australia Bushings 3A2 ID brass tubing soldered horns long wearing properties Pushrods Sig carbon-fiber units 3A2 wire ends like wrap carbon tubes some carbon-fiber cord stub wire exits tube side insure will never split fail flap/elevator ratio 11 Tail Surfaces pure Baron Avanti shape area However structure simple solid 3/ sheet balsa sanded shape stab assembly size usually sheeted foam built-up sheeted weighing test panels convinced solid 3/ balsa proper density light more-complex structures certainly lot easier fabricate Two best-turning models Ive ever built Mackey Lark Super Chief used simple sheet tail surfaces Fuselage somewhat unusual must plan hatch allow fuel tank installed removed adjusted will guarantee never have according Murphys Law hatch cut fuselage outboard side using Dremel saw Drill hole insert blade overflow tube will exit hatch hole lined /16 plywood receive 2-56 blind nuts hatch retention firewall two laminations five-ply /s plywood joined epoxy Spruce triangular stock helps anchor firewall sides top bottom blocks engine mount aluminum JTec #53 filed needed accept Merco 61 crankcase wish modify nose 1/2 square maple mounts feel free used metal mount could try kinds engines Merco 61 needs four-ounce tank other engines will need plan both tank hatch size Kenn Smith can provide custom-made metal fuel tanks larger capacity SuperTigre Double Star 60s tanks should 11/4 11/2 depth about four inches long two inches wide lower tank platform should placed needed allow tank mount its centerline engine Chances will need shim tank -i/is equal-speed revs upright inverted engines top bottom blocks hollowed Center Gravity CC forward order further stiffen nose cylinder mounted sideways vibration forces side-to-side rather up-and-down usual Stunter solid blocks go long way toward absorbing vibration additional weight negligible blocks hollow youd probably end up needing nose weight anyhow prefer frame up fuselage blocks tacked place Sig-Ment assembly carved sanded shape blocks cut free hollowed engine tank installation fully worked out now too Only wing stab installed fact prefer pre-finish wing stab point ready silver base coat before Continued page 63 58 Model Aviation en Dixon executes classic Stunt launch Praxis borrows nose construction look 1988-90 world champion Skywriter Access glow plug simple side-mounted engine Almost impossible flood too Praxis/Dixon Continued page 58 installation fuselage Working components separately lets work go faster cuts down dings hangar rash handling complete model Finish I am countrys best prefer light good enough flawless too heavy Paint coat Hobbypoxy clear paint wing tail has cured sanded couple coats Sig clear nitrate dope brushed Medium silkspan applied using nitrate adhesive silkspan given thorough sanding 180- 240grit sandpaper after two coats nitrate another two three coats sprayed sanded 320 400 needed Next comes filler coat nitrate talc use pharmaceutical talc has no scent oilscheck druggist filler sanded 240 320 finally 400 tedious process After wing tail installed fuselage fin covered Sig glass cloth applied using Hobbypoxy finishing epoxy thinned acetone dope thinner lay cloth model brush epoxy mixture through cloth use epoxy necessary tack cloth down wood will absorb thinned glue adding weight After first epoxy coat cloth sanded lightly 240 paper second thinned coat epoxy applied will look like filling cloth isdont worryAfter curing least 24 hours second coat sanded 80-grit paper break hard surface shell wet-sanded 320 400 Low spots will show up shiny light bounced off surface keep sanding until gone sand through cloth spot two can touched up cyanoacrylate CyA glue kicker sanded match surrounding areas After glassing Epoxolite fillets added fuselage fin got couple coats nitrate filler coat always sand out fillets wet using 240 paper clean thoroughly alcohol Two coats unthinned nitrate brushed onto fillets Ive never fillet bubble using nitrate-based filler colors Sig dope white has extra pigment added Windy Urtnowski red blue Sig spray cans hate cleaning gun changing trim colors As long youre satisfied basic colors cans much easier clear top coat automotive acrylic lacquer DuPont 3608s equivalent sure use recommended thinner use acrylic clear allowed dry four five days month dope wetsanded 1000-grit 1500-grit paper use auto windshield washer fluid medium wet-sanding finegrit paper wants grab using water After sanding clear polished DuPont #7 white compound Brasso Finally apply coat wax Flying Praxis flown 018 cable 69 feet length centerline airplane centerline handle 51 46 used lines should about 65 feet length use 285 venturi Merco 61 along Kustom Kraftsmanship needle assembly brass tubing extension soldered needle clear fuselage muffler custom tube type manufactured Art Adamisin shortened intake stack pull up close fuselage use Taffinder PA blend fuel 10% nitro prop usually three-bladed Bolly 111/4 x 6/2 have depitched give great advantages full line fuels ranging 0% price cars boats ducted idii3 fixeu Wi~ rurary wing theres Byron Fuel blended specifically needs including three premium Byron RACE car fuels Get fueling confidence Get Byron Fuel fuel champions BYRON ORIGINALS INCF nt stock Byron Fuel contact us direct Ida Grove IA 51445 364-3165 November1995 63 T-ON OWEN LESS HIISSLE MORE FUN Dieselize Davis Diesel Its Awesome 4 50% Power Same Easy Starting No Glow Plugs Runs 7hice Long e Sound DAVIS P0 Box 141 DetMA Milford CT 06460 877-1 MODEL PROCUCTS complete ormation packet send $400 Icredit applied first orderl 2-5 Cu EAIlJflEAsk about oat Balsa-ply constructIonEobaost gUll SlOtS Oil30 lb tated Notcb tab easy assemblycoaler shroad carbFIJN-TRAX Retracts showo cube scoop anailableRETRACTS Marking templatesin formed plasticas Si ys Accurafe scale outliceComplete iostrsctions 5 Sheets raIled plansTwo lOCfl wing Higb lift airfoil tsrNarrow gegr problems FREE very slow landingsoalnedCATALOG ANOTHER JIM MEISTER 1/4 SCALE SEMI-KIT Complete & Partial Kits also available Phone information Scale flight ttaeiflg manual available $500 plans Only $200 SEND TO Jim Meisler 6319 NC 49 Mebane NC 27302 19101 562-3700 5/4 SCALEllIIi[i PLANS$4000 CANOPY$3000 SPINNER 7-1/2$4000 FORMED PLASTIC EXHAUST SCOOPS . $2500 SHIPPING$1000 TOTAL$ i 51/4 51/2 depending conditions pitch used dead air tess high wind have props same make diameter reworked /4-inch pitch increments 5 625 will ready conditions 12 x 6 twoblade reworked various pitches also good Master Airscrew wood props old lop Flite paddle blades B Y&O props Clarence Bull excellent prefer wide 12 x 6 narrow 13 x 5 due precession effects mentioned earlier just what does Praxis mean anyhow Its used various psychological theological texts refer integration thought behavior fitting name model integrates number different beliefs Enjoy Praxis fly safely Sources Merco 61 custom engines Double Star Engines control horns Controline Sales Box 67166 Marietta GA 30066 Bellcrank Dan Winship 5971 Oak Hill East Dr Plainfield IN 46168 Foam wings cores Aerosmith RD1 Box 290 Athens NY 12015 Fuel tanks Keun Smith 521 Jansen Ave San Dimas CA 91773 Three-bladed props Brian Eather 9 Medley Ave Liverpool NSW 2170 Australia Bolly Props Unit 8-9 100 Hewittson Rd Elizabeth West SA 5113 Australia Wooden Props B-Y&O Props/Clarence Bull Box 492 Harrisburg OR 97448 Paint Pigment Windy Urtnowski 93 Elliott P1 Rutherford NJ 07070 odei Aviation AT-6 TEXAN DELUXE ARC KIT vying panvyiny MIvdruaetaycacitgine25-26 lbs Special Features 3-Piece Wing Unique Epoxy/Balsa Center Section & Epoxy Wheel Wells Retract Ready Carbon Fiber Reinforced Wing Tube Internally Ribbed Epoxy Fuselage Greater Ridigity Laser Cut Fuselage Formers & Firewall Ready Cover Balsa Sheeted Wings Stabiliser Control Surfaces Ready Hingeing 3-Panel Clear Canopy Fo fu deta heAT6 TexotsondallosarotberARF mode Ca 0 5V ZIMPRO MARKETING PO Box 5776 Oak Ridge Tenneasee 37831 615-482-6188 Orders Only 800-431-4868 VOUrSOALE HEADQUARTERS Larqe Model Fun Easy Way Engineered Lazy Builders sce MUSTANG CORSAIR SPITFIRE MKU THUNDERBOLT

Author: T. Dixon


Edition: Model Aviation - 1995/11
Page Numbers: 56, 57, 58, 63, 64

Ft U Tom Dixon design flies face prevailing wisdom country regarding CL Stunt models does use tuned pipe has engine mounted idewinder style cylinder mounted outside flight circle Texans please write 1990-91 agent importing distribution fully 7 framed finished Skywriter models 1988-90 world champion Zhang Xiang Dong impressed Zhangs incredible workmanship approach design Skywriters built two-piece wings removable tails fit 40 x 20 x 12-inch boxes work proceeded rough out sketch make come together moments amalgam Avanti Skywriter wing mounted 3/ inch below thrustline stab thrustline Mounting wing thrustline would require leadouts exit /16-/8 toward bottom fuselage allow wings-level flying landing gear length weight muffler weight sideexhaust engine will bias vertical center gravity CU somewhat easier move wing leadouts thats wing 3/ off center looked sidemounted no-cowl nose treatment impressed its elegant simplicity natural way mount engine thrustline wing stab same center line During 1993 built Walt Pyron-designed P-39 Airacobra Classic Stunt model designed 1958 uses Fox 35 cylinder mounted outboard Fox notoriously fickle about running properly outboard-mounted cylinder however proper adjustment tank height little experimenting different plugs fuels Fox ran perfectly figured Fox worked way anything else would too about same time experimenting lots What certainly true lots speed power torque model lots -of power will maintain its speed better after tight turns will punch through turbulent air better will generally maintain line tension better under conditions F2B rules limit us 10cc 61 cubic inches engine size makes sense use size engine airframe can built correct size weight use power original 60 size models up 900 square inches wing area flew fine could real handful high winds world level 60powered models 650-680 square inches size model won World F2B Championship 1986 88 90 94 models usually weigh about 56 ounces use props 11-12 inches diameter 51/451/2 inches true pitch power Merco 61 airframe originally designed 40 45 Charisma flew very well Merco despite being overweight began feel could no such thing overpowering CL Stunt model provided wing loading within acceptable limits correct propeller used convenience ordered foam core Bob Barons Avanti design Scott Smith Avanti originally flown OS 40 45 FSR placed second 1984 World Champs As sheeted Avanti wing thought occurred mate Skywriter-style fuselage no-spinner front end would allow try variety different-length engines worrying about spinner mating up exactly So have flown observed tuned-pipe setups am convinced about claims made increased power constant speed true cost complexity double conventional four-strokeWhere possible lower diameter used three blade configuration smaller diameter can use still have adequate thrust overhead line tension better Diameter can cause precession problems increases leading instability lack groove major problems piped models high rpm use prop mass becomes significant gyroscope gust wind yaws model also causes pitch up down due 900 effects precession lower rpm traditional setups largely negates problem youve seen pipe models lump around bounce out bottoms maneuvers often cause high-energy gyroscope high-rpm prop culprit wiggling rudder cannot offset forces associated effect Keeping rpm prop diameter low practical helps lot Praxis cobbled up practical easy build maintain model using traditional 60 power either Merco 61 SuperTigre 60 Several new engines can also used including ST 60 copy Double Star Moldova Discovery engines Ukraine kept light Praxis will perform well ST 51 RoyalIOS 46s However aint no substitute cubic inches November1995 57 am E0t rf4zed i*0dd4 eaaed -Tom Dixon mu flOtOS ne author Uraphlc ueslgn Heather Erdahi Author 10-year-old son Steven prepare startup Steven seasoned mechanic & budding flier z4 Type CL Stunt Wingspan 59 inches Engine sizeltype Merco 61 Hying weight 46 ounces Construction Sheet & foam Covering/finish Silkspan dope wing stab fiberglass epoxy dope fuselage fin CONSTRUCTION nothing especially difficult about construction model youve ever built full-bodied competition stunter Nonetheless will cover few points less-experienced builders Wing The wing can built-up foam cases built-up wing will two ounces lighter Begin wing construction sandwiching rib blanks between plywood templates carving sanding shape Repeat opposite wing Dont worry too much about bevel ribs glue will allow adequate strength contact sheeting prefer use Adjusto-Jig built-up wings wing can built flat surface such hollow door care taken shim spars maintain true shape entire span foam wing can ordered bare core completely sheeted Aerosmith Aviation Contact Scott Smith details sheeted core myself using nating epoxy adhesive sheeted panels should weigh 31/2 4 ounces per panel optimum performance four-inch bellerank Dan Winship best Ive ever seen Control horns 1/g wire manufactured Robin Hiern Melbourne Australia Bushings 3A2 ID brass tubing soldered horns long wearing properties Pushrods Sig carbon-fiber units 3A2 wire ends like wrap carbon tubes some carbon-fiber cord stub wire exits tube side insure will never split fail flap/elevator ratio 11 Tail Surfaces pure Baron Avanti shape area However structure simple solid 3/ sheet balsa sanded shape stab assembly size usually sheeted foam built-up sheeted weighing test panels convinced solid 3/ balsa proper density light more-complex structures certainly lot easier fabricate Two best-turning models Ive ever built Mackey Lark Super Chief used simple sheet tail surfaces Fuselage somewhat unusual must plan hatch allow fuel tank installed removed adjusted will guarantee never have according Murphys Law hatch cut fuselage outboard side using Dremel saw Drill hole insert blade overflow tube will exit hatch hole lined /16 plywood receive 2-56 blind nuts hatch retention firewall two laminations five-ply /s plywood joined epoxy Spruce triangular stock helps anchor firewall sides top bottom blocks engine mount aluminum JTec #53 filed needed accept Merco 61 crankcase wish modify nose 1/2 square maple mounts feel free used metal mount could try kinds engines Merco 61 needs four-ounce tank other engines will need plan both tank hatch size Kenn Smith can provide custom-made metal fuel tanks larger capacity SuperTigre Double Star 60s tanks should 11/4 11/2 depth about four inches long two inches wide lower tank platform should placed needed allow tank mount its centerline engine Chances will need shim tank -i/is equal-speed revs upright inverted engines top bottom blocks hollowed Center Gravity CC forward order further stiffen nose cylinder mounted sideways vibration forces side-to-side rather up-and-down usual Stunter solid blocks go long way toward absorbing vibration additional weight negligible blocks hollow youd probably end up needing nose weight anyhow prefer frame up fuselage blocks tacked place Sig-Ment assembly carved sanded shape blocks cut free hollowed engine tank installation fully worked out now too Only wing stab installed fact prefer pre-finish wing stab point ready silver base coat before Continued page 63 58 Model Aviation en Dixon executes classic Stunt launch Praxis borrows nose construction look 1988-90 world champion Skywriter Access glow plug simple side-mounted engine Almost impossible flood too Praxis/Dixon Continued page 58 installation fuselage Working components separately lets work go faster cuts down dings hangar rash handling complete model Finish I am countrys best prefer light good enough flawless too heavy Paint coat Hobbypoxy clear paint wing tail has cured sanded couple coats Sig clear nitrate dope brushed Medium silkspan applied using nitrate adhesive silkspan given thorough sanding 180- 240grit sandpaper after two coats nitrate another two three coats sprayed sanded 320 400 needed Next comes filler coat nitrate talc use pharmaceutical talc has no scent oilscheck druggist filler sanded 240 320 finally 400 tedious process After wing tail installed fuselage fin covered Sig glass cloth applied using Hobbypoxy finishing epoxy thinned acetone dope thinner lay cloth model brush epoxy mixture through cloth use epoxy necessary tack cloth down wood will absorb thinned glue adding weight After first epoxy coat cloth sanded lightly 240 paper second thinned coat epoxy applied will look like filling cloth isdont worryAfter curing least 24 hours second coat sanded 80-grit paper break hard surface shell wet-sanded 320 400 Low spots will show up shiny light bounced off surface keep sanding until gone sand through cloth spot two can touched up cyanoacrylate CyA glue kicker sanded match surrounding areas After glassing Epoxolite fillets added fuselage fin got couple coats nitrate filler coat always sand out fillets wet using 240 paper clean thoroughly alcohol Two coats unthinned nitrate brushed onto fillets Ive never fillet bubble using nitrate-based filler colors Sig dope white has extra pigment added Windy Urtnowski red blue Sig spray cans hate cleaning gun changing trim colors As long youre satisfied basic colors cans much easier clear top coat automotive acrylic lacquer DuPont 3608s equivalent sure use recommended thinner use acrylic clear allowed dry four five days month dope wetsanded 1000-grit 1500-grit paper use auto windshield washer fluid medium wet-sanding finegrit paper wants grab using water After sanding clear polished DuPont #7 white compound Brasso Finally apply coat wax Flying Praxis flown 018 cable 69 feet length centerline airplane centerline handle 51 46 used lines should about 65 feet length use 285 venturi Merco 61 along Kustom Kraftsmanship needle assembly brass tubing extension soldered needle clear fuselage muffler custom tube type manufactured Art Adamisin shortened intake stack pull up close fuselage use Taffinder PA blend fuel 10% nitro prop usually three-bladed Bolly 111/4 x 6/2 have depitched give great advantages full line fuels ranging 0% price cars boats ducted idii3 fixeu Wi~ rurary wing theres Byron Fuel blended specifically needs including three premium Byron RACE car fuels Get fueling confidence Get Byron Fuel fuel champions BYRON ORIGINALS INCF nt stock Byron Fuel contact us direct Ida Grove IA 51445 364-3165 November1995 63 T-ON OWEN LESS HIISSLE MORE FUN Dieselize Davis Diesel Its Awesome 4 50% Power Same Easy Starting No Glow Plugs Runs 7hice Long e Sound DAVIS P0 Box 141 DetMA Milford CT 06460 877-1 MODEL PROCUCTS complete ormation packet send $400 Icredit applied first orderl 2-5 Cu EAIlJflEAsk about oat Balsa-ply constructIonEobaost gUll SlOtS Oil30 lb tated Notcb tab easy assemblycoaler shroad carbFIJN-TRAX Retracts showo cube scoop anailableRETRACTS Marking templatesin formed plasticas Si ys Accurafe scale outliceComplete iostrsctions 5 Sheets raIled plansTwo lOCfl wing Higb lift airfoil tsrNarrow gegr problems FREE very slow landingsoalnedCATALOG ANOTHER JIM MEISTER 1/4 SCALE SEMI-KIT Complete & Partial Kits also available Phone information Scale flight ttaeiflg manual available $500 plans Only $200 SEND TO Jim Meisler 6319 NC 49 Mebane NC 27302 19101 562-3700 5/4 SCALEllIIi[i PLANS$4000 CANOPY$3000 SPINNER 7-1/2$4000 FORMED PLASTIC EXHAUST SCOOPS . $2500 SHIPPING$1000 TOTAL$ i 51/4 51/2 depending conditions pitch used dead air tess high wind have props same make diameter reworked /4-inch pitch increments 5 625 will ready conditions 12 x 6 twoblade reworked various pitches also good Master Airscrew wood props old lop Flite paddle blades B Y&O props Clarence Bull excellent prefer wide 12 x 6 narrow 13 x 5 due precession effects mentioned earlier just what does Praxis mean anyhow Its used various psychological theological texts refer integration thought behavior fitting name model integrates number different beliefs Enjoy Praxis fly safely Sources Merco 61 custom engines Double Star Engines control horns Controline Sales Box 67166 Marietta GA 30066 Bellcrank Dan Winship 5971 Oak Hill East Dr Plainfield IN 46168 Foam wings cores Aerosmith RD1 Box 290 Athens NY 12015 Fuel tanks Keun Smith 521 Jansen Ave San Dimas CA 91773 Three-bladed props Brian Eather 9 Medley Ave Liverpool NSW 2170 Australia Bolly Props Unit 8-9 100 Hewittson Rd Elizabeth West SA 5113 Australia Wooden Props B-Y&O Props/Clarence Bull Box 492 Harrisburg OR 97448 Paint Pigment Windy Urtnowski 93 Elliott P1 Rutherford NJ 07070 odei Aviation AT-6 TEXAN DELUXE ARC KIT vying panvyiny MIvdruaetaycacitgine25-26 lbs Special Features 3-Piece Wing Unique Epoxy/Balsa Center Section & Epoxy Wheel Wells Retract Ready Carbon Fiber Reinforced Wing Tube Internally Ribbed Epoxy Fuselage Greater Ridigity Laser Cut Fuselage Formers & Firewall Ready Cover Balsa Sheeted Wings Stabiliser Control Surfaces Ready Hingeing 3-Panel Clear Canopy Fo fu deta heAT6 TexotsondallosarotberARF mode Ca 0 5V ZIMPRO MARKETING PO Box 5776 Oak Ridge Tenneasee 37831 615-482-6188 Orders Only 800-431-4868 VOUrSOALE HEADQUARTERS Larqe Model Fun Easy Way Engineered Lazy Builders sce MUSTANG CORSAIR SPITFIRE MKU THUNDERBOLT

Author: T. Dixon


Edition: Model Aviation - 1995/11
Page Numbers: 56, 57, 58, 63, 64

Ft U Tom Dixon design flies face prevailing wisdom country regarding CL Stunt models does use tuned pipe has engine mounted idewinder style cylinder mounted outside flight circle Texans please write 1990-91 agent importing distribution fully 7 framed finished Skywriter models 1988-90 world champion Zhang Xiang Dong impressed Zhangs incredible workmanship approach design Skywriters built two-piece wings removable tails fit 40 x 20 x 12-inch boxes work proceeded rough out sketch make come together moments amalgam Avanti Skywriter wing mounted 3/ inch below thrustline stab thrustline Mounting wing thrustline would require leadouts exit /16-/8 toward bottom fuselage allow wings-level flying landing gear length weight muffler weight sideexhaust engine will bias vertical center gravity CU somewhat easier move wing leadouts thats wing 3/ off center looked sidemounted no-cowl nose treatment impressed its elegant simplicity natural way mount engine thrustline wing stab same center line During 1993 built Walt Pyron-designed P-39 Airacobra Classic Stunt model designed 1958 uses Fox 35 cylinder mounted outboard Fox notoriously fickle about running properly outboard-mounted cylinder however proper adjustment tank height little experimenting different plugs fuels Fox ran perfectly figured Fox worked way anything else would too about same time experimenting lots What certainly true lots speed power torque model lots -of power will maintain its speed better after tight turns will punch through turbulent air better will generally maintain line tension better under conditions F2B rules limit us 10cc 61 cubic inches engine size makes sense use size engine airframe can built correct size weight use power original 60 size models up 900 square inches wing area flew fine could real handful high winds world level 60powered models 650-680 square inches size model won World F2B Championship 1986 88 90 94 models usually weigh about 56 ounces use props 11-12 inches diameter 51/451/2 inches true pitch power Merco 61 airframe originally designed 40 45 Charisma flew very well Merco despite being overweight began feel could no such thing overpowering CL Stunt model provided wing loading within acceptable limits correct propeller used convenience ordered foam core Bob Barons Avanti design Scott Smith Avanti originally flown OS 40 45 FSR placed second 1984 World Champs As sheeted Avanti wing thought occurred mate Skywriter-style fuselage no-spinner front end would allow try variety different-length engines worrying about spinner mating up exactly So have flown observed tuned-pipe setups am convinced about claims made increased power constant speed true cost complexity double conventional four-strokeWhere possible lower diameter used three blade configuration smaller diameter can use still have adequate thrust overhead line tension better Diameter can cause precession problems increases leading instability lack groove major problems piped models high rpm use prop mass becomes significant gyroscope gust wind yaws model also causes pitch up down due 900 effects precession lower rpm traditional setups largely negates problem youve seen pipe models lump around bounce out bottoms maneuvers often cause high-energy gyroscope high-rpm prop culprit wiggling rudder cannot offset forces associated effect Keeping rpm prop diameter low practical helps lot Praxis cobbled up practical easy build maintain model using traditional 60 power either Merco 61 SuperTigre 60 Several new engines can also used including ST 60 copy Double Star Moldova Discovery engines Ukraine kept light Praxis will perform well ST 51 RoyalIOS 46s However aint no substitute cubic inches November1995 57 am E0t rf4zed i*0dd4 eaaed -Tom Dixon mu flOtOS ne author Uraphlc ueslgn Heather Erdahi Author 10-year-old son Steven prepare startup Steven seasoned mechanic & budding flier z4 Type CL Stunt Wingspan 59 inches Engine sizeltype Merco 61 Hying weight 46 ounces Construction Sheet & foam Covering/finish Silkspan dope wing stab fiberglass epoxy dope fuselage fin CONSTRUCTION nothing especially difficult about construction model youve ever built full-bodied competition stunter Nonetheless will cover few points less-experienced builders Wing The wing can built-up foam cases built-up wing will two ounces lighter Begin wing construction sandwiching rib blanks between plywood templates carving sanding shape Repeat opposite wing Dont worry too much about bevel ribs glue will allow adequate strength contact sheeting prefer use Adjusto-Jig built-up wings wing can built flat surface such hollow door care taken shim spars maintain true shape entire span foam wing can ordered bare core completely sheeted Aerosmith Aviation Contact Scott Smith details sheeted core myself using nating epoxy adhesive sheeted panels should weigh 31/2 4 ounces per panel optimum performance four-inch bellerank Dan Winship best Ive ever seen Control horns 1/g wire manufactured Robin Hiern Melbourne Australia Bushings 3A2 ID brass tubing soldered horns long wearing properties Pushrods Sig carbon-fiber units 3A2 wire ends like wrap carbon tubes some carbon-fiber cord stub wire exits tube side insure will never split fail flap/elevator ratio 11 Tail Surfaces pure Baron Avanti shape area However structure simple solid 3/ sheet balsa sanded shape stab assembly size usually sheeted foam built-up sheeted weighing test panels convinced solid 3/ balsa proper density light more-complex structures certainly lot easier fabricate Two best-turning models Ive ever built Mackey Lark Super Chief used simple sheet tail surfaces Fuselage somewhat unusual must plan hatch allow fuel tank installed removed adjusted will guarantee never have according Murphys Law hatch cut fuselage outboard side using Dremel saw Drill hole insert blade overflow tube will exit hatch hole lined /16 plywood receive 2-56 blind nuts hatch retention firewall two laminations five-ply /s plywood joined epoxy Spruce triangular stock helps anchor firewall sides top bottom blocks engine mount aluminum JTec #53 filed needed accept Merco 61 crankcase wish modify nose 1/2 square maple mounts feel free used metal mount could try kinds engines Merco 61 needs four-ounce tank other engines will need plan both tank hatch size Kenn Smith can provide custom-made metal fuel tanks larger capacity SuperTigre Double Star 60s tanks should 11/4 11/2 depth about four inches long two inches wide lower tank platform should placed needed allow tank mount its centerline engine Chances will need shim tank -i/is equal-speed revs upright inverted engines top bottom blocks hollowed Center Gravity CC forward order further stiffen nose cylinder mounted sideways vibration forces side-to-side rather up-and-down usual Stunter solid blocks go long way toward absorbing vibration additional weight negligible blocks hollow youd probably end up needing nose weight anyhow prefer frame up fuselage blocks tacked place Sig-Ment assembly carved sanded shape blocks cut free hollowed engine tank installation fully worked out now too Only wing stab installed fact prefer pre-finish wing stab point ready silver base coat before Continued page 63 58 Model Aviation en Dixon executes classic Stunt launch Praxis borrows nose construction look 1988-90 world champion Skywriter Access glow plug simple side-mounted engine Almost impossible flood too Praxis/Dixon Continued page 58 installation fuselage Working components separately lets work go faster cuts down dings hangar rash handling complete model Finish I am countrys best prefer light good enough flawless too heavy Paint coat Hobbypoxy clear paint wing tail has cured sanded couple coats Sig clear nitrate dope brushed Medium silkspan applied using nitrate adhesive silkspan given thorough sanding 180- 240grit sandpaper after two coats nitrate another two three coats sprayed sanded 320 400 needed Next comes filler coat nitrate talc use pharmaceutical talc has no scent oilscheck druggist filler sanded 240 320 finally 400 tedious process After wing tail installed fuselage fin covered Sig glass cloth applied using Hobbypoxy finishing epoxy thinned acetone dope thinner lay cloth model brush epoxy mixture through cloth use epoxy necessary tack cloth down wood will absorb thinned glue adding weight After first epoxy coat cloth sanded lightly 240 paper second thinned coat epoxy applied will look like filling cloth isdont worryAfter curing least 24 hours second coat sanded 80-grit paper break hard surface shell wet-sanded 320 400 Low spots will show up shiny light bounced off surface keep sanding until gone sand through cloth spot two can touched up cyanoacrylate CyA glue kicker sanded match surrounding areas After glassing Epoxolite fillets added fuselage fin got couple coats nitrate filler coat always sand out fillets wet using 240 paper clean thoroughly alcohol Two coats unthinned nitrate brushed onto fillets Ive never fillet bubble using nitrate-based filler colors Sig dope white has extra pigment added Windy Urtnowski red blue Sig spray cans hate cleaning gun changing trim colors As long youre satisfied basic colors cans much easier clear top coat automotive acrylic lacquer DuPont 3608s equivalent sure use recommended thinner use acrylic clear allowed dry four five days month dope wetsanded 1000-grit 1500-grit paper use auto windshield washer fluid medium wet-sanding finegrit paper wants grab using water After sanding clear polished DuPont #7 white compound Brasso Finally apply coat wax Flying Praxis flown 018 cable 69 feet length centerline airplane centerline handle 51 46 used lines should about 65 feet length use 285 venturi Merco 61 along Kustom Kraftsmanship needle assembly brass tubing extension soldered needle clear fuselage muffler custom tube type manufactured Art Adamisin shortened intake stack pull up close fuselage use Taffinder PA blend fuel 10% nitro prop usually three-bladed Bolly 111/4 x 6/2 have depitched give great advantages full line fuels ranging 0% price cars boats ducted idii3 fixeu Wi~ rurary wing theres Byron Fuel blended specifically needs including three premium Byron RACE car fuels Get fueling confidence Get Byron Fuel fuel champions BYRON ORIGINALS INCF nt stock Byron Fuel contact us direct Ida Grove IA 51445 364-3165 November1995 63 T-ON OWEN LESS HIISSLE MORE FUN Dieselize Davis Diesel Its Awesome 4 50% Power Same Easy Starting No Glow Plugs Runs 7hice Long e Sound DAVIS P0 Box 141 DetMA Milford CT 06460 877-1 MODEL PROCUCTS complete ormation packet send $400 Icredit applied first orderl 2-5 Cu EAIlJflEAsk about oat Balsa-ply constructIonEobaost gUll SlOtS Oil30 lb tated Notcb tab easy assemblycoaler shroad carbFIJN-TRAX Retracts showo cube scoop anailableRETRACTS Marking templatesin formed plasticas Si ys Accurafe scale outliceComplete iostrsctions 5 Sheets raIled plansTwo lOCfl wing Higb lift airfoil tsrNarrow gegr problems FREE very slow landingsoalnedCATALOG ANOTHER JIM MEISTER 1/4 SCALE SEMI-KIT Complete & Partial Kits also available Phone information Scale flight ttaeiflg manual available $500 plans Only $200 SEND TO Jim Meisler 6319 NC 49 Mebane NC 27302 19101 562-3700 5/4 SCALEllIIi[i PLANS$4000 CANOPY$3000 SPINNER 7-1/2$4000 FORMED PLASTIC EXHAUST SCOOPS . $2500 SHIPPING$1000 TOTAL$ i 51/4 51/2 depending conditions pitch used dead air tess high wind have props same make diameter reworked /4-inch pitch increments 5 625 will ready conditions 12 x 6 twoblade reworked various pitches also good Master Airscrew wood props old lop Flite paddle blades B Y&O props Clarence Bull excellent prefer wide 12 x 6 narrow 13 x 5 due precession effects mentioned earlier just what does Praxis mean anyhow Its used various psychological theological texts refer integration thought behavior fitting name model integrates number different beliefs Enjoy Praxis fly safely Sources Merco 61 custom engines Double Star Engines control horns Controline Sales Box 67166 Marietta GA 30066 Bellcrank Dan Winship 5971 Oak Hill East Dr Plainfield IN 46168 Foam wings cores Aerosmith RD1 Box 290 Athens NY 12015 Fuel tanks Keun Smith 521 Jansen Ave San Dimas CA 91773 Three-bladed props Brian Eather 9 Medley Ave Liverpool NSW 2170 Australia Bolly Props Unit 8-9 100 Hewittson Rd Elizabeth West SA 5113 Australia Wooden Props B-Y&O Props/Clarence Bull Box 492 Harrisburg OR 97448 Paint Pigment Windy Urtnowski 93 Elliott P1 Rutherford NJ 07070 odei Aviation AT-6 TEXAN DELUXE ARC KIT vying panvyiny MIvdruaetaycacitgine25-26 lbs Special Features 3-Piece Wing Unique Epoxy/Balsa Center Section & Epoxy Wheel Wells Retract Ready Carbon Fiber Reinforced Wing Tube Internally Ribbed Epoxy Fuselage Greater Ridigity Laser Cut Fuselage Formers & Firewall Ready Cover Balsa Sheeted Wings Stabiliser Control Surfaces Ready Hingeing 3-Panel Clear Canopy Fo fu deta heAT6 TexotsondallosarotberARF mode Ca 0 5V ZIMPRO MARKETING PO Box 5776 Oak Ridge Tenneasee 37831 615-482-6188 Orders Only 800-431-4868 VOUrSOALE HEADQUARTERS Larqe Model Fun Easy Way Engineered Lazy Builders sce MUSTANG CORSAIR SPITFIRE MKU THUNDERBOLT

Author: T. Dixon


Edition: Model Aviation - 1995/11
Page Numbers: 56, 57, 58, 63, 64

Ft U Tom Dixon design flies face prevailing wisdom country regarding CL Stunt models does use tuned pipe has engine mounted idewinder style cylinder mounted outside flight circle Texans please write 1990-91 agent importing distribution fully 7 framed finished Skywriter models 1988-90 world champion Zhang Xiang Dong impressed Zhangs incredible workmanship approach design Skywriters built two-piece wings removable tails fit 40 x 20 x 12-inch boxes work proceeded rough out sketch make come together moments amalgam Avanti Skywriter wing mounted 3/ inch below thrustline stab thrustline Mounting wing thrustline would require leadouts exit /16-/8 toward bottom fuselage allow wings-level flying landing gear length weight muffler weight sideexhaust engine will bias vertical center gravity CU somewhat easier move wing leadouts thats wing 3/ off center looked sidemounted no-cowl nose treatment impressed its elegant simplicity natural way mount engine thrustline wing stab same center line During 1993 built Walt Pyron-designed P-39 Airacobra Classic Stunt model designed 1958 uses Fox 35 cylinder mounted outboard Fox notoriously fickle about running properly outboard-mounted cylinder however proper adjustment tank height little experimenting different plugs fuels Fox ran perfectly figured Fox worked way anything else would too about same time experimenting lots What certainly true lots speed power torque model lots -of power will maintain its speed better after tight turns will punch through turbulent air better will generally maintain line tension better under conditions F2B rules limit us 10cc 61 cubic inches engine size makes sense use size engine airframe can built correct size weight use power original 60 size models up 900 square inches wing area flew fine could real handful high winds world level 60powered models 650-680 square inches size model won World F2B Championship 1986 88 90 94 models usually weigh about 56 ounces use props 11-12 inches diameter 51/451/2 inches true pitch power Merco 61 airframe originally designed 40 45 Charisma flew very well Merco despite being overweight began feel could no such thing overpowering CL Stunt model provided wing loading within acceptable limits correct propeller used convenience ordered foam core Bob Barons Avanti design Scott Smith Avanti originally flown OS 40 45 FSR placed second 1984 World Champs As sheeted Avanti wing thought occurred mate Skywriter-style fuselage no-spinner front end would allow try variety different-length engines worrying about spinner mating up exactly So have flown observed tuned-pipe setups am convinced about claims made increased power constant speed true cost complexity double conventional four-strokeWhere possible lower diameter used three blade configuration smaller diameter can use still have adequate thrust overhead line tension better Diameter can cause precession problems increases leading instability lack groove major problems piped models high rpm use prop mass becomes significant gyroscope gust wind yaws model also causes pitch up down due 900 effects precession lower rpm traditional setups largely negates problem youve seen pipe models lump around bounce out bottoms maneuvers often cause high-energy gyroscope high-rpm prop culprit wiggling rudder cannot offset forces associated effect Keeping rpm prop diameter low practical helps lot Praxis cobbled up practical easy build maintain model using traditional 60 power either Merco 61 SuperTigre 60 Several new engines can also used including ST 60 copy Double Star Moldova Discovery engines Ukraine kept light Praxis will perform well ST 51 RoyalIOS 46s However aint no substitute cubic inches November1995 57 am E0t rf4zed i*0dd4 eaaed -Tom Dixon mu flOtOS ne author Uraphlc ueslgn Heather Erdahi Author 10-year-old son Steven prepare startup Steven seasoned mechanic & budding flier z4 Type CL Stunt Wingspan 59 inches Engine sizeltype Merco 61 Hying weight 46 ounces Construction Sheet & foam Covering/finish Silkspan dope wing stab fiberglass epoxy dope fuselage fin CONSTRUCTION nothing especially difficult about construction model youve ever built full-bodied competition stunter Nonetheless will cover few points less-experienced builders Wing The wing can built-up foam cases built-up wing will two ounces lighter Begin wing construction sandwiching rib blanks between plywood templates carving sanding shape Repeat opposite wing Dont worry too much about bevel ribs glue will allow adequate strength contact sheeting prefer use Adjusto-Jig built-up wings wing can built flat surface such hollow door care taken shim spars maintain true shape entire span foam wing can ordered bare core completely sheeted Aerosmith Aviation Contact Scott Smith details sheeted core myself using nating epoxy adhesive sheeted panels should weigh 31/2 4 ounces per panel optimum performance four-inch bellerank Dan Winship best Ive ever seen Control horns 1/g wire manufactured Robin Hiern Melbourne Australia Bushings 3A2 ID brass tubing soldered horns long wearing properties Pushrods Sig carbon-fiber units 3A2 wire ends like wrap carbon tubes some carbon-fiber cord stub wire exits tube side insure will never split fail flap/elevator ratio 11 Tail Surfaces pure Baron Avanti shape area However structure simple solid 3/ sheet balsa sanded shape stab assembly size usually sheeted foam built-up sheeted weighing test panels convinced solid 3/ balsa proper density light more-complex structures certainly lot easier fabricate Two best-turning models Ive ever built Mackey Lark Super Chief used simple sheet tail surfaces Fuselage somewhat unusual must plan hatch allow fuel tank installed removed adjusted will guarantee never have according Murphys Law hatch cut fuselage outboard side using Dremel saw Drill hole insert blade overflow tube will exit hatch hole lined /16 plywood receive 2-56 blind nuts hatch retention firewall two laminations five-ply /s plywood joined epoxy Spruce triangular stock helps anchor firewall sides top bottom blocks engine mount aluminum JTec #53 filed needed accept Merco 61 crankcase wish modify nose 1/2 square maple mounts feel free used metal mount could try kinds engines Merco 61 needs four-ounce tank other engines will need plan both tank hatch size Kenn Smith can provide custom-made metal fuel tanks larger capacity SuperTigre Double Star 60s tanks should 11/4 11/2 depth about four inches long two inches wide lower tank platform should placed needed allow tank mount its centerline engine Chances will need shim tank -i/is equal-speed revs upright inverted engines top bottom blocks hollowed Center Gravity CC forward order further stiffen nose cylinder mounted sideways vibration forces side-to-side rather up-and-down usual Stunter solid blocks go long way toward absorbing vibration additional weight negligible blocks hollow youd probably end up needing nose weight anyhow prefer frame up fuselage blocks tacked place Sig-Ment assembly carved sanded shape blocks cut free hollowed engine tank installation fully worked out now too Only wing stab installed fact prefer pre-finish wing stab point ready silver base coat before Continued page 63 58 Model Aviation en Dixon executes classic Stunt launch Praxis borrows nose construction look 1988-90 world champion Skywriter Access glow plug simple side-mounted engine Almost impossible flood too Praxis/Dixon Continued page 58 installation fuselage Working components separately lets work go faster cuts down dings hangar rash handling complete model Finish I am countrys best prefer light good enough flawless too heavy Paint coat Hobbypoxy clear paint wing tail has cured sanded couple coats Sig clear nitrate dope brushed Medium silkspan applied using nitrate adhesive silkspan given thorough sanding 180- 240grit sandpaper after two coats nitrate another two three coats sprayed sanded 320 400 needed Next comes filler coat nitrate talc use pharmaceutical talc has no scent oilscheck druggist filler sanded 240 320 finally 400 tedious process After wing tail installed fuselage fin covered Sig glass cloth applied using Hobbypoxy finishing epoxy thinned acetone dope thinner lay cloth model brush epoxy mixture through cloth use epoxy necessary tack cloth down wood will absorb thinned glue adding weight After first epoxy coat cloth sanded lightly 240 paper second thinned coat epoxy applied will look like filling cloth isdont worryAfter curing least 24 hours second coat sanded 80-grit paper break hard surface shell wet-sanded 320 400 Low spots will show up shiny light bounced off surface keep sanding until gone sand through cloth spot two can touched up cyanoacrylate CyA glue kicker sanded match surrounding areas After glassing Epoxolite fillets added fuselage fin got couple coats nitrate filler coat always sand out fillets wet using 240 paper clean thoroughly alcohol Two coats unthinned nitrate brushed onto fillets Ive never fillet bubble using nitrate-based filler colors Sig dope white has extra pigment added Windy Urtnowski red blue Sig spray cans hate cleaning gun changing trim colors As long youre satisfied basic colors cans much easier clear top coat automotive acrylic lacquer DuPont 3608s equivalent sure use recommended thinner use acrylic clear allowed dry four five days month dope wetsanded 1000-grit 1500-grit paper use auto windshield washer fluid medium wet-sanding finegrit paper wants grab using water After sanding clear polished DuPont #7 white compound Brasso Finally apply coat wax Flying Praxis flown 018 cable 69 feet length centerline airplane centerline handle 51 46 used lines should about 65 feet length use 285 venturi Merco 61 along Kustom Kraftsmanship needle assembly brass tubing extension soldered needle clear fuselage muffler custom tube type manufactured Art Adamisin shortened intake stack pull up close fuselage use Taffinder PA blend fuel 10% nitro prop usually three-bladed Bolly 111/4 x 6/2 have depitched give great advantages full line fuels ranging 0% price cars boats ducted idii3 fixeu Wi~ rurary wing theres Byron Fuel blended specifically needs including three premium Byron RACE car fuels Get fueling confidence Get Byron Fuel fuel champions BYRON ORIGINALS INCF nt stock Byron Fuel contact us direct Ida Grove IA 51445 364-3165 November1995 63 T-ON OWEN LESS HIISSLE MORE FUN Dieselize Davis Diesel Its Awesome 4 50% Power Same Easy Starting No Glow Plugs Runs 7hice Long e Sound DAVIS P0 Box 141 DetMA Milford CT 06460 877-1 MODEL PROCUCTS complete ormation packet send $400 Icredit applied first orderl 2-5 Cu EAIlJflEAsk about oat Balsa-ply constructIonEobaost gUll SlOtS Oil30 lb tated Notcb tab easy assemblycoaler shroad carbFIJN-TRAX Retracts showo cube scoop anailableRETRACTS Marking templatesin formed plasticas Si ys Accurafe scale outliceComplete iostrsctions 5 Sheets raIled plansTwo lOCfl wing Higb lift airfoil tsrNarrow gegr problems FREE very slow landingsoalnedCATALOG ANOTHER JIM MEISTER 1/4 SCALE SEMI-KIT Complete & Partial Kits also available Phone information Scale flight ttaeiflg manual available $500 plans Only $200 SEND TO Jim Meisler 6319 NC 49 Mebane NC 27302 19101 562-3700 5/4 SCALEllIIi[i PLANS$4000 CANOPY$3000 SPINNER 7-1/2$4000 FORMED PLASTIC EXHAUST SCOOPS . $2500 SHIPPING$1000 TOTAL$ i 51/4 51/2 depending conditions pitch used dead air tess high wind have props same make diameter reworked /4-inch pitch increments 5 625 will ready conditions 12 x 6 twoblade reworked various pitches also good Master Airscrew wood props old lop Flite paddle blades B Y&O props Clarence Bull excellent prefer wide 12 x 6 narrow 13 x 5 due precession effects mentioned earlier just what does Praxis mean anyhow Its used various psychological theological texts refer integration thought behavior fitting name model integrates number different beliefs Enjoy Praxis fly safely Sources Merco 61 custom engines Double Star Engines control horns Controline Sales Box 67166 Marietta GA 30066 Bellcrank Dan Winship 5971 Oak Hill East Dr Plainfield IN 46168 Foam wings cores Aerosmith RD1 Box 290 Athens NY 12015 Fuel tanks Keun Smith 521 Jansen Ave San Dimas CA 91773 Three-bladed props Brian Eather 9 Medley Ave Liverpool NSW 2170 Australia Bolly Props Unit 8-9 100 Hewittson Rd Elizabeth West SA 5113 Australia Wooden Props B-Y&O Props/Clarence Bull Box 492 Harrisburg OR 97448 Paint Pigment Windy Urtnowski 93 Elliott P1 Rutherford NJ 07070 odei Aviation AT-6 TEXAN DELUXE ARC KIT vying panvyiny MIvdruaetaycacitgine25-26 lbs Special Features 3-Piece Wing Unique Epoxy/Balsa Center Section & Epoxy Wheel Wells Retract Ready Carbon Fiber Reinforced Wing Tube Internally Ribbed Epoxy Fuselage Greater Ridigity Laser Cut Fuselage Formers & Firewall Ready Cover Balsa Sheeted Wings Stabiliser Control Surfaces Ready Hingeing 3-Panel Clear Canopy Fo fu deta heAT6 TexotsondallosarotberARF mode Ca 0 5V ZIMPRO MARKETING PO Box 5776 Oak Ridge Tenneasee 37831 615-482-6188 Orders Only 800-431-4868 VOUrSOALE HEADQUARTERS Larqe Model Fun Easy Way Engineered Lazy Builders sce MUSTANG CORSAIR SPITFIRE MKU THUNDERBOLT

Author: T. Dixon


Edition: Model Aviation - 1995/11
Page Numbers: 56, 57, 58, 63, 64

Ft U Tom Dixon design flies face prevailing wisdom country regarding CL Stunt models does use tuned pipe has engine mounted idewinder style cylinder mounted outside flight circle Texans please write 1990-91 agent importing distribution fully 7 framed finished Skywriter models 1988-90 world champion Zhang Xiang Dong impressed Zhangs incredible workmanship approach design Skywriters built two-piece wings removable tails fit 40 x 20 x 12-inch boxes work proceeded rough out sketch make come together moments amalgam Avanti Skywriter wing mounted 3/ inch below thrustline stab thrustline Mounting wing thrustline would require leadouts exit /16-/8 toward bottom fuselage allow wings-level flying landing gear length weight muffler weight sideexhaust engine will bias vertical center gravity CU somewhat easier move wing leadouts thats wing 3/ off center looked sidemounted no-cowl nose treatment impressed its elegant simplicity natural way mount engine thrustline wing stab same center line During 1993 built Walt Pyron-designed P-39 Airacobra Classic Stunt model designed 1958 uses Fox 35 cylinder mounted outboard Fox notoriously fickle about running properly outboard-mounted cylinder however proper adjustment tank height little experimenting different plugs fuels Fox ran perfectly figured Fox worked way anything else would too about same time experimenting lots What certainly true lots speed power torque model lots -of power will maintain its speed better after tight turns will punch through turbulent air better will generally maintain line tension better under conditions F2B rules limit us 10cc 61 cubic inches engine size makes sense use size engine airframe can built correct size weight use power original 60 size models up 900 square inches wing area flew fine could real handful high winds world level 60powered models 650-680 square inches size model won World F2B Championship 1986 88 90 94 models usually weigh about 56 ounces use props 11-12 inches diameter 51/451/2 inches true pitch power Merco 61 airframe originally designed 40 45 Charisma flew very well Merco despite being overweight began feel could no such thing overpowering CL Stunt model provided wing loading within acceptable limits correct propeller used convenience ordered foam core Bob Barons Avanti design Scott Smith Avanti originally flown OS 40 45 FSR placed second 1984 World Champs As sheeted Avanti wing thought occurred mate Skywriter-style fuselage no-spinner front end would allow try variety different-length engines worrying about spinner mating up exactly So have flown observed tuned-pipe setups am convinced about claims made increased power constant speed true cost complexity double conventional four-strokeWhere possible lower diameter used three blade configuration smaller diameter can use still have adequate thrust overhead line tension better Diameter can cause precession problems increases leading instability lack groove major problems piped models high rpm use prop mass becomes significant gyroscope gust wind yaws model also causes pitch up down due 900 effects precession lower rpm traditional setups largely negates problem youve seen pipe models lump around bounce out bottoms maneuvers often cause high-energy gyroscope high-rpm prop culprit wiggling rudder cannot offset forces associated effect Keeping rpm prop diameter low practical helps lot Praxis cobbled up practical easy build maintain model using traditional 60 power either Merco 61 SuperTigre 60 Several new engines can also used including ST 60 copy Double Star Moldova Discovery engines Ukraine kept light Praxis will perform well ST 51 RoyalIOS 46s However aint no substitute cubic inches November1995 57 am E0t rf4zed i*0dd4 eaaed -Tom Dixon mu flOtOS ne author Uraphlc ueslgn Heather Erdahi Author 10-year-old son Steven prepare startup Steven seasoned mechanic & budding flier z4 Type CL Stunt Wingspan 59 inches Engine sizeltype Merco 61 Hying weight 46 ounces Construction Sheet & foam Covering/finish Silkspan dope wing stab fiberglass epoxy dope fuselage fin CONSTRUCTION nothing especially difficult about construction model youve ever built full-bodied competition stunter Nonetheless will cover few points less-experienced builders Wing The wing can built-up foam cases built-up wing will two ounces lighter Begin wing construction sandwiching rib blanks between plywood templates carving sanding shape Repeat opposite wing Dont worry too much about bevel ribs glue will allow adequate strength contact sheeting prefer use Adjusto-Jig built-up wings wing can built flat surface such hollow door care taken shim spars maintain true shape entire span foam wing can ordered bare core completely sheeted Aerosmith Aviation Contact Scott Smith details sheeted core myself using nating epoxy adhesive sheeted panels should weigh 31/2 4 ounces per panel optimum performance four-inch bellerank Dan Winship best Ive ever seen Control horns 1/g wire manufactured Robin Hiern Melbourne Australia Bushings 3A2 ID brass tubing soldered horns long wearing properties Pushrods Sig carbon-fiber units 3A2 wire ends like wrap carbon tubes some carbon-fiber cord stub wire exits tube side insure will never split fail flap/elevator ratio 11 Tail Surfaces pure Baron Avanti shape area However structure simple solid 3/ sheet balsa sanded shape stab assembly size usually sheeted foam built-up sheeted weighing test panels convinced solid 3/ balsa proper density light more-complex structures certainly lot easier fabricate Two best-turning models Ive ever built Mackey Lark Super Chief used simple sheet tail surfaces Fuselage somewhat unusual must plan hatch allow fuel tank installed removed adjusted will guarantee never have according Murphys Law hatch cut fuselage outboard side using Dremel saw Drill hole insert blade overflow tube will exit hatch hole lined /16 plywood receive 2-56 blind nuts hatch retention firewall two laminations five-ply /s plywood joined epoxy Spruce triangular stock helps anchor firewall sides top bottom blocks engine mount aluminum JTec #53 filed needed accept Merco 61 crankcase wish modify nose 1/2 square maple mounts feel free used metal mount could try kinds engines Merco 61 needs four-ounce tank other engines will need plan both tank hatch size Kenn Smith can provide custom-made metal fuel tanks larger capacity SuperTigre Double Star 60s tanks should 11/4 11/2 depth about four inches long two inches wide lower tank platform should placed needed allow tank mount its centerline engine Chances will need shim tank -i/is equal-speed revs upright inverted engines top bottom blocks hollowed Center Gravity CC forward order further stiffen nose cylinder mounted sideways vibration forces side-to-side rather up-and-down usual Stunter solid blocks go long way toward absorbing vibration additional weight negligible blocks hollow youd probably end up needing nose weight anyhow prefer frame up fuselage blocks tacked place Sig-Ment assembly carved sanded shape blocks cut free hollowed engine tank installation fully worked out now too Only wing stab installed fact prefer pre-finish wing stab point ready silver base coat before Continued page 63 58 Model Aviation en Dixon executes classic Stunt launch Praxis borrows nose construction look 1988-90 world champion Skywriter Access glow plug simple side-mounted engine Almost impossible flood too Praxis/Dixon Continued page 58 installation fuselage Working components separately lets work go faster cuts down dings hangar rash handling complete model Finish I am countrys best prefer light good enough flawless too heavy Paint coat Hobbypoxy clear paint wing tail has cured sanded couple coats Sig clear nitrate dope brushed Medium silkspan applied using nitrate adhesive silkspan given thorough sanding 180- 240grit sandpaper after two coats nitrate another two three coats sprayed sanded 320 400 needed Next comes filler coat nitrate talc use pharmaceutical talc has no scent oilscheck druggist filler sanded 240 320 finally 400 tedious process After wing tail installed fuselage fin covered Sig glass cloth applied using Hobbypoxy finishing epoxy thinned acetone dope thinner lay cloth model brush epoxy mixture through cloth use epoxy necessary tack cloth down wood will absorb thinned glue adding weight After first epoxy coat cloth sanded lightly 240 paper second thinned coat epoxy applied will look like filling cloth isdont worryAfter curing least 24 hours second coat sanded 80-grit paper break hard surface shell wet-sanded 320 400 Low spots will show up shiny light bounced off surface keep sanding until gone sand through cloth spot two can touched up cyanoacrylate CyA glue kicker sanded match surrounding areas After glassing Epoxolite fillets added fuselage fin got couple coats nitrate filler coat always sand out fillets wet using 240 paper clean thoroughly alcohol Two coats unthinned nitrate brushed onto fillets Ive never fillet bubble using nitrate-based filler colors Sig dope white has extra pigment added Windy Urtnowski red blue Sig spray cans hate cleaning gun changing trim colors As long youre satisfied basic colors cans much easier clear top coat automotive acrylic lacquer DuPont 3608s equivalent sure use recommended thinner use acrylic clear allowed dry four five days month dope wetsanded 1000-grit 1500-grit paper use auto windshield washer fluid medium wet-sanding finegrit paper wants grab using water After sanding clear polished DuPont #7 white compound Brasso Finally apply coat wax Flying Praxis flown 018 cable 69 feet length centerline airplane centerline handle 51 46 used lines should about 65 feet length use 285 venturi Merco 61 along Kustom Kraftsmanship needle assembly brass tubing extension soldered needle clear fuselage muffler custom tube type manufactured Art Adamisin shortened intake stack pull up close fuselage use Taffinder PA blend fuel 10% nitro prop usually three-bladed Bolly 111/4 x 6/2 have depitched give great advantages full line fuels ranging 0% price cars boats ducted idii3 fixeu Wi~ rurary wing theres Byron Fuel blended specifically needs including three premium Byron RACE car fuels Get fueling confidence Get Byron Fuel fuel champions BYRON ORIGINALS INCF nt stock Byron Fuel contact us direct Ida Grove IA 51445 364-3165 November1995 63 T-ON OWEN LESS HIISSLE MORE FUN Dieselize Davis Diesel Its Awesome 4 50% Power Same Easy Starting No Glow Plugs Runs 7hice Long e Sound DAVIS P0 Box 141 DetMA Milford CT 06460 877-1 MODEL PROCUCTS complete ormation packet send $400 Icredit applied first orderl 2-5 Cu EAIlJflEAsk about oat Balsa-ply constructIonEobaost gUll SlOtS Oil30 lb tated Notcb tab easy assemblycoaler shroad carbFIJN-TRAX Retracts showo cube scoop anailableRETRACTS Marking templatesin formed plasticas Si ys Accurafe scale outliceComplete iostrsctions 5 Sheets raIled plansTwo lOCfl wing Higb lift airfoil tsrNarrow gegr problems FREE very slow landingsoalnedCATALOG ANOTHER JIM MEISTER 1/4 SCALE SEMI-KIT Complete & Partial Kits also available Phone information Scale flight ttaeiflg manual available $500 plans Only $200 SEND TO Jim Meisler 6319 NC 49 Mebane NC 27302 19101 562-3700 5/4 SCALEllIIi[i PLANS$4000 CANOPY$3000 SPINNER 7-1/2$4000 FORMED PLASTIC EXHAUST SCOOPS . $2500 SHIPPING$1000 TOTAL$ i 51/4 51/2 depending conditions pitch used dead air tess high wind have props same make diameter reworked /4-inch pitch increments 5 625 will ready conditions 12 x 6 twoblade reworked various pitches also good Master Airscrew wood props old lop Flite paddle blades B Y&O props Clarence Bull excellent prefer wide 12 x 6 narrow 13 x 5 due precession effects mentioned earlier just what does Praxis mean anyhow Its used various psychological theological texts refer integration thought behavior fitting name model integrates number different beliefs Enjoy Praxis fly safely Sources Merco 61 custom engines Double Star Engines control horns Controline Sales Box 67166 Marietta GA 30066 Bellcrank Dan Winship 5971 Oak Hill East Dr Plainfield IN 46168 Foam wings cores Aerosmith RD1 Box 290 Athens NY 12015 Fuel tanks Keun Smith 521 Jansen Ave San Dimas CA 91773 Three-bladed props Brian Eather 9 Medley Ave Liverpool NSW 2170 Australia Bolly Props Unit 8-9 100 Hewittson Rd Elizabeth West SA 5113 Australia Wooden Props B-Y&O Props/Clarence Bull Box 492 Harrisburg OR 97448 Paint Pigment Windy Urtnowski 93 Elliott P1 Rutherford NJ 07070 odei Aviation AT-6 TEXAN DELUXE ARC KIT vying panvyiny MIvdruaetaycacitgine25-26 lbs Special Features 3-Piece Wing Unique Epoxy/Balsa Center Section & Epoxy Wheel Wells Retract Ready Carbon Fiber Reinforced Wing Tube Internally Ribbed Epoxy Fuselage Greater Ridigity Laser Cut Fuselage Formers & Firewall Ready Cover Balsa Sheeted Wings Stabiliser Control Surfaces Ready Hingeing 3-Panel Clear Canopy Fo fu deta heAT6 TexotsondallosarotberARF mode Ca 0 5V ZIMPRO MARKETING PO Box 5776 Oak Ridge Tenneasee 37831 615-482-6188 Orders Only 800-431-4868 VOUrSOALE HEADQUARTERS Larqe Model Fun Easy Way Engineered Lazy Builders sce MUSTANG CORSAIR SPITFIRE MKU THUNDERBOLT

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