IIIREXDETh K1IEXDETh Powered Cox Tee Dee above-average Free Flight designed meet list demanding righton requirementsthus avoiding outmoded method bending airframe series modifications Designed Dale E Mateer Text Mateer Jerry W Barnette NEW MODEL design must have reason being better performance bet ter construction myriad other reasons Another truism sooner later free fighters get itch roll own advance Free-Flight state art designing own fly ing machine Thus birth French Wench systematic approach taken new design Rather drawing nice sporty-looking airplane followed countless modifications redesigns make perform adequately form-fol lows-function approach adopted set design objectives established features satisfied ob jectives would determine what final de sign would look like approach mind following design objectives established Light weight one-pound brick flies better 20-pound brick Fast climb Because fly mostly Category II contests East Coast brisk climb required short engine runs well fly-off flights Good glide good glide prime requirement contest Free-Flight model Warp-free construction must constantly check warps retrim model because something basically wrong design Now have objectives achieve goals approach meeting light-weight criteria very careful selection wood through efficient design controlling amount wood airplane means some what smaller wood sizes normally used same time exercising great care make airplane too flimsy medium- small-to-medium size model selected smaller wood sizes proper grain selection can used safely technique easily seen fuselage construction ap proach also applied wing stab design Because wings weight spanwise parts area attempting weight reduction view number size spars reduced minimum However number size spars cannot reduced too much because wing will prone warp bings up point warp-free construction medium-small fast light-weight Free-Flight model wing stab must built true warp free weak wing stab warps changes its trim will result either disaster mediocre per formance So reduce num ber size spars still maintain strong warp-free wing stab light-weight model geodetic construction answer 1/16 x spars may appear anemic quite ade quate geodetic layout 1/32-in sheet fuselage sides may also appear undersize result very strong C-grain wood used tissue covered 32 Model Aviation Warp-free construction requisite good competition free flight minimize elimi nate such annoyances designer used geodetic construction both wing stabilizer sun shining through flying surfaces pic above makes obvious feature Below Timer pinches off fuel pacifier tank activates OT line addition slight theoretical ad vantage elliptical tips add strength area help reduce weight opposed use rectangular tips fast-climb requirement met overall wing size 248 sq area use thin airfoil light-weight construction course hot Cox Tee Dee fed high nitro fuel pressurized pacifier turning small prop also helps use rear fin directly adding speed climb contributes better power pattern As glide requirement achieving light-weight objective having 5 ounce all-up airplane helps glide con siderably course other design factors also contribute example moderate aspect ratio 78 31 percent stab efficiently sized tail moment etc Theory logic very good question does work case French Wench answer yes design does result very light-weight model warp free has floating glide has impressive rapid climb wins contests another nice feature further prove validity con cept design scaled up B-Gas size 560 sq 24 oz K&B 29 rear rotor shown photos B-job did prove soundness design impressive performer should noted despite rapid climb power pattern very safe both sizes name French Wench Orig inally design nameless After model flew well won few contests decided give design name its own what call Much thought research went finding appro priate descriptive pleasant sounding name new bird Friends asked contribute names Weeks went finding right name evening during hangar flying session some friends wife dropped some coffee Hearing name dilemma wife said French Wench great unwritten rules never argues bringer coffee wife Construction wing straight forward con struction Using plywood metal tem plate cut out straight geodetic ribs light-weight C-grain stock Cut h-in wide strips /8-in wide strips tip leading trailing edge lami nations Notch trailing edges main panels pin plans Pin leading edges lower spar plans Medium-hard stock should used main panel leading edges trailing edges spars Use Hot Stuff adhesive Tite Bond glue construction begin construction laminate tip leading edges trailing edges Establish lamination guide placing pins about -in apart plans around inner trailing leading edge outlines Pin balsa tip blocks place Bend first lamination around pins glue tip block Hot Stuff Continue procedure adding strip time until laminations glued place Pin lower tip spar plans Glue straight ribs except dihedral breaks Add top main spar geo detic ribs remaining top spar Remove main tip panels plans sand shape using spars tip panels guide Prepare join panels sanding leading edges trailing edges proper angles Epoxy dihedral polyhedral joints angles specified plans Add plywood dihedral braces main panels should have no warps tips should have small amount wash-out Add re maining straight geodetic ribs dihedral breaks Glue center planking gussets Apply two coats clear dope entire structure sand lightly Cover Japanese tissue apply three coats thinned clear dope Apply final coat K&B epoxy clear paint especially nlanning use high-nitro fuels Stab construction very similar wing additional instruction necessary Finish same manner wing Add 1/32-in wire hold-down hook brass DT hook reinforcement Start fuselage construction assem bling pylon fin Cut fuse lage sides size 1/32-in firm Cgrain stock Pin right fuselage side plans Glue right side 1/16 x top bottom 1/16 X onals Add pylon fin left fuselage side Remove fuselage plans add balsa cheeks Select engine mount drill appropriate holes -in plywood firewall Install blind mounting nuts firewall epoxy firewall fuselage Add 1/16-in plywood timer-mount ing plate wing platform Install stab platform small amount tilt righthand glide Apply two coats clear dope entire fuselage sand lightly Cover fuselage Japanese tissue finish three coats clear dope final coat K&B epoxy Install aluminum snuffer tube DT wire alumi num DT guide tubes sure guide tube stab hold down area posi July1975 33 Contrasting colors covering material make pretty airplane Jap tissue given three thinned clear dope final K&B epoxy clear paintstands up high-nitro fuels Curved portions tips stab edges built up 1/16 x 1/8 laminations tioned hold-down rubber bands pass over tube Install mount engine timer pacifier tank Finish plane keying stab wing wing should keyed right wing leads left wing approximately 3/16in Positioning wing manner eliminates need wash-in right wing panel recommend 5-3 Cox gray prop Check balance point. should fall 75-80 percent range add weight accordingly Hand glide model adjust proper incidence glide turn Make first test flight engine running rich timer set about two seconds Continue test flying gradually increasing power engine run until plane adjusted steep righthand climb smooth transition right glide II/IA PLY BRACE II Iii TOP AND BOTTOM /I / II IFIX6PLYBRACE LIZZZZIZiIiZiL _____ I/IA SHEET DIAGONAL WSJG RIbS I/IS SHEET WING RIBS rIiZZZIZh1EZzzzz7~ I/IA SHEET DIAGONAL STAB RIBS I/ WIRE HOOK. 11W SHEET STAB RIBS OPTIONAL TIP /IBIII/BSPRtJCE I/IA PLYWOODI/B SHEET TISER MOUNT/' I J / RAFTH4YES MOJNTT MER 7/ 1/32 WIRE WASHER0 N 1/4 ALUM TIJENG BALSA BLOCKS I/A PLY / I/IA BALSA PLATFORM I/B SHEET BRACES 1/32 SHEET / I/IA PLY 7 $1 ____ I/B PLY -- 4-z-r. 117 BALSA FILL--I/IA I/B RUNNERS /1/32 SIDES / THE FRENCH WENCH 34 Model Aviation Dethermalizer tilting stabilizer mounted ahead fin Plc shows actuated position its trailing edge elevated steep descent Plans make clear stop mount prove validity concept Mateer scaled job up B version area 560 squares rear-rotor 29 1/4 1/4 LE i/ia I/S SPAR TOP AND BOTTOM ALL RIBS 1/16 SHEET / I/IS SHEET GUSSETS // I/B 1/2 TE TIPS LAMINATEO FROM 1/16 1/4 STRIPS LE LAMINATED FROM I/IS 3/IS STRIPS AVK 7 3/32 50 SPARS K I/IS SHEET RIBS / SWE 1400 CENTER RIB I/B SHEET TE LAMINATED FROM 1/16 I/B STRIPS 2- I/S DETAILSBALSA BLOCK 1/32 WIRE LOOPi/i / Il/fl -u VIe ALUM TUBING B TOP SOT TOM1 DT LINE VIZ I/IS PLY 'Ii } / SHEET / S I/IS I/B SPRUCE L E Li I/S BALSA PLOC / DESIGNED BY DALE E MATEER 012 Inches 456 July1975 35 IS I/B SPAR 7 / /4 I- BALSA PILL
Edition: Model Aviation - 1975/07
Page Numbers: 32, 33, 34, 35
IIIREXDETh K1IEXDETh Powered Cox Tee Dee above-average Free Flight designed meet list demanding righton requirementsthus avoiding outmoded method bending airframe series modifications Designed Dale E Mateer Text Mateer Jerry W Barnette NEW MODEL design must have reason being better performance bet ter construction myriad other reasons Another truism sooner later free fighters get itch roll own advance Free-Flight state art designing own fly ing machine Thus birth French Wench systematic approach taken new design Rather drawing nice sporty-looking airplane followed countless modifications redesigns make perform adequately form-fol lows-function approach adopted set design objectives established features satisfied ob jectives would determine what final de sign would look like approach mind following design objectives established Light weight one-pound brick flies better 20-pound brick Fast climb Because fly mostly Category II contests East Coast brisk climb required short engine runs well fly-off flights Good glide good glide prime requirement contest Free-Flight model Warp-free construction must constantly check warps retrim model because something basically wrong design Now have objectives achieve goals approach meeting light-weight criteria very careful selection wood through efficient design controlling amount wood airplane means some what smaller wood sizes normally used same time exercising great care make airplane too flimsy medium- small-to-medium size model selected smaller wood sizes proper grain selection can used safely technique easily seen fuselage construction ap proach also applied wing stab design Because wings weight spanwise parts area attempting weight reduction view number size spars reduced minimum However number size spars cannot reduced too much because wing will prone warp bings up point warp-free construction medium-small fast light-weight Free-Flight model wing stab must built true warp free weak wing stab warps changes its trim will result either disaster mediocre per formance So reduce num ber size spars still maintain strong warp-free wing stab light-weight model geodetic construction answer 1/16 x spars may appear anemic quite ade quate geodetic layout 1/32-in sheet fuselage sides may also appear undersize result very strong C-grain wood used tissue covered 32 Model Aviation Warp-free construction requisite good competition free flight minimize elimi nate such annoyances designer used geodetic construction both wing stabilizer sun shining through flying surfaces pic above makes obvious feature Below Timer pinches off fuel pacifier tank activates OT line addition slight theoretical ad vantage elliptical tips add strength area help reduce weight opposed use rectangular tips fast-climb requirement met overall wing size 248 sq area use thin airfoil light-weight construction course hot Cox Tee Dee fed high nitro fuel pressurized pacifier turning small prop also helps use rear fin directly adding speed climb contributes better power pattern As glide requirement achieving light-weight objective having 5 ounce all-up airplane helps glide con siderably course other design factors also contribute example moderate aspect ratio 78 31 percent stab efficiently sized tail moment etc Theory logic very good question does work case French Wench answer yes design does result very light-weight model warp free has floating glide has impressive rapid climb wins contests another nice feature further prove validity con cept design scaled up B-Gas size 560 sq 24 oz K&B 29 rear rotor shown photos B-job did prove soundness design impressive performer should noted despite rapid climb power pattern very safe both sizes name French Wench Orig inally design nameless After model flew well won few contests decided give design name its own what call Much thought research went finding appro priate descriptive pleasant sounding name new bird Friends asked contribute names Weeks went finding right name evening during hangar flying session some friends wife dropped some coffee Hearing name dilemma wife said French Wench great unwritten rules never argues bringer coffee wife Construction wing straight forward con struction Using plywood metal tem plate cut out straight geodetic ribs light-weight C-grain stock Cut h-in wide strips /8-in wide strips tip leading trailing edge lami nations Notch trailing edges main panels pin plans Pin leading edges lower spar plans Medium-hard stock should used main panel leading edges trailing edges spars Use Hot Stuff adhesive Tite Bond glue construction begin construction laminate tip leading edges trailing edges Establish lamination guide placing pins about -in apart plans around inner trailing leading edge outlines Pin balsa tip blocks place Bend first lamination around pins glue tip block Hot Stuff Continue procedure adding strip time until laminations glued place Pin lower tip spar plans Glue straight ribs except dihedral breaks Add top main spar geo detic ribs remaining top spar Remove main tip panels plans sand shape using spars tip panels guide Prepare join panels sanding leading edges trailing edges proper angles Epoxy dihedral polyhedral joints angles specified plans Add plywood dihedral braces main panels should have no warps tips should have small amount wash-out Add re maining straight geodetic ribs dihedral breaks Glue center planking gussets Apply two coats clear dope entire structure sand lightly Cover Japanese tissue apply three coats thinned clear dope Apply final coat K&B epoxy clear paint especially nlanning use high-nitro fuels Stab construction very similar wing additional instruction necessary Finish same manner wing Add 1/32-in wire hold-down hook brass DT hook reinforcement Start fuselage construction assem bling pylon fin Cut fuse lage sides size 1/32-in firm Cgrain stock Pin right fuselage side plans Glue right side 1/16 x top bottom 1/16 X onals Add pylon fin left fuselage side Remove fuselage plans add balsa cheeks Select engine mount drill appropriate holes -in plywood firewall Install blind mounting nuts firewall epoxy firewall fuselage Add 1/16-in plywood timer-mount ing plate wing platform Install stab platform small amount tilt righthand glide Apply two coats clear dope entire fuselage sand lightly Cover fuselage Japanese tissue finish three coats clear dope final coat K&B epoxy Install aluminum snuffer tube DT wire alumi num DT guide tubes sure guide tube stab hold down area posi July1975 33 Contrasting colors covering material make pretty airplane Jap tissue given three thinned clear dope final K&B epoxy clear paintstands up high-nitro fuels Curved portions tips stab edges built up 1/16 x 1/8 laminations tioned hold-down rubber bands pass over tube Install mount engine timer pacifier tank Finish plane keying stab wing wing should keyed right wing leads left wing approximately 3/16in Positioning wing manner eliminates need wash-in right wing panel recommend 5-3 Cox gray prop Check balance point. should fall 75-80 percent range add weight accordingly Hand glide model adjust proper incidence glide turn Make first test flight engine running rich timer set about two seconds Continue test flying gradually increasing power engine run until plane adjusted steep righthand climb smooth transition right glide II/IA PLY BRACE II Iii TOP AND BOTTOM /I / II IFIX6PLYBRACE LIZZZZIZiIiZiL _____ I/IA SHEET DIAGONAL WSJG RIbS I/IS SHEET WING RIBS rIiZZZIZh1EZzzzz7~ I/IA SHEET DIAGONAL STAB RIBS I/ WIRE HOOK. 11W SHEET STAB RIBS OPTIONAL TIP /IBIII/BSPRtJCE I/IA PLYWOODI/B SHEET TISER MOUNT/' I J / RAFTH4YES MOJNTT MER 7/ 1/32 WIRE WASHER0 N 1/4 ALUM TIJENG BALSA BLOCKS I/A PLY / I/IA BALSA PLATFORM I/B SHEET BRACES 1/32 SHEET / I/IA PLY 7 $1 ____ I/B PLY -- 4-z-r. 117 BALSA FILL--I/IA I/B RUNNERS /1/32 SIDES / THE FRENCH WENCH 34 Model Aviation Dethermalizer tilting stabilizer mounted ahead fin Plc shows actuated position its trailing edge elevated steep descent Plans make clear stop mount prove validity concept Mateer scaled job up B version area 560 squares rear-rotor 29 1/4 1/4 LE i/ia I/S SPAR TOP AND BOTTOM ALL RIBS 1/16 SHEET / I/IS SHEET GUSSETS // I/B 1/2 TE TIPS LAMINATEO FROM 1/16 1/4 STRIPS LE LAMINATED FROM I/IS 3/IS STRIPS AVK 7 3/32 50 SPARS K I/IS SHEET RIBS / SWE 1400 CENTER RIB I/B SHEET TE LAMINATED FROM 1/16 I/B STRIPS 2- I/S DETAILSBALSA BLOCK 1/32 WIRE LOOPi/i / Il/fl -u VIe ALUM TUBING B TOP SOT TOM1 DT LINE VIZ I/IS PLY 'Ii } / SHEET / S I/IS I/B SPRUCE L E Li I/S BALSA PLOC / DESIGNED BY DALE E MATEER 012 Inches 456 July1975 35 IS I/B SPAR 7 / /4 I- BALSA PILL
Edition: Model Aviation - 1975/07
Page Numbers: 32, 33, 34, 35
IIIREXDETh K1IEXDETh Powered Cox Tee Dee above-average Free Flight designed meet list demanding righton requirementsthus avoiding outmoded method bending airframe series modifications Designed Dale E Mateer Text Mateer Jerry W Barnette NEW MODEL design must have reason being better performance bet ter construction myriad other reasons Another truism sooner later free fighters get itch roll own advance Free-Flight state art designing own fly ing machine Thus birth French Wench systematic approach taken new design Rather drawing nice sporty-looking airplane followed countless modifications redesigns make perform adequately form-fol lows-function approach adopted set design objectives established features satisfied ob jectives would determine what final de sign would look like approach mind following design objectives established Light weight one-pound brick flies better 20-pound brick Fast climb Because fly mostly Category II contests East Coast brisk climb required short engine runs well fly-off flights Good glide good glide prime requirement contest Free-Flight model Warp-free construction must constantly check warps retrim model because something basically wrong design Now have objectives achieve goals approach meeting light-weight criteria very careful selection wood through efficient design controlling amount wood airplane means some what smaller wood sizes normally used same time exercising great care make airplane too flimsy medium- small-to-medium size model selected smaller wood sizes proper grain selection can used safely technique easily seen fuselage construction ap proach also applied wing stab design Because wings weight spanwise parts area attempting weight reduction view number size spars reduced minimum However number size spars cannot reduced too much because wing will prone warp bings up point warp-free construction medium-small fast light-weight Free-Flight model wing stab must built true warp free weak wing stab warps changes its trim will result either disaster mediocre per formance So reduce num ber size spars still maintain strong warp-free wing stab light-weight model geodetic construction answer 1/16 x spars may appear anemic quite ade quate geodetic layout 1/32-in sheet fuselage sides may also appear undersize result very strong C-grain wood used tissue covered 32 Model Aviation Warp-free construction requisite good competition free flight minimize elimi nate such annoyances designer used geodetic construction both wing stabilizer sun shining through flying surfaces pic above makes obvious feature Below Timer pinches off fuel pacifier tank activates OT line addition slight theoretical ad vantage elliptical tips add strength area help reduce weight opposed use rectangular tips fast-climb requirement met overall wing size 248 sq area use thin airfoil light-weight construction course hot Cox Tee Dee fed high nitro fuel pressurized pacifier turning small prop also helps use rear fin directly adding speed climb contributes better power pattern As glide requirement achieving light-weight objective having 5 ounce all-up airplane helps glide con siderably course other design factors also contribute example moderate aspect ratio 78 31 percent stab efficiently sized tail moment etc Theory logic very good question does work case French Wench answer yes design does result very light-weight model warp free has floating glide has impressive rapid climb wins contests another nice feature further prove validity con cept design scaled up B-Gas size 560 sq 24 oz K&B 29 rear rotor shown photos B-job did prove soundness design impressive performer should noted despite rapid climb power pattern very safe both sizes name French Wench Orig inally design nameless After model flew well won few contests decided give design name its own what call Much thought research went finding appro priate descriptive pleasant sounding name new bird Friends asked contribute names Weeks went finding right name evening during hangar flying session some friends wife dropped some coffee Hearing name dilemma wife said French Wench great unwritten rules never argues bringer coffee wife Construction wing straight forward con struction Using plywood metal tem plate cut out straight geodetic ribs light-weight C-grain stock Cut h-in wide strips /8-in wide strips tip leading trailing edge lami nations Notch trailing edges main panels pin plans Pin leading edges lower spar plans Medium-hard stock should used main panel leading edges trailing edges spars Use Hot Stuff adhesive Tite Bond glue construction begin construction laminate tip leading edges trailing edges Establish lamination guide placing pins about -in apart plans around inner trailing leading edge outlines Pin balsa tip blocks place Bend first lamination around pins glue tip block Hot Stuff Continue procedure adding strip time until laminations glued place Pin lower tip spar plans Glue straight ribs except dihedral breaks Add top main spar geo detic ribs remaining top spar Remove main tip panels plans sand shape using spars tip panels guide Prepare join panels sanding leading edges trailing edges proper angles Epoxy dihedral polyhedral joints angles specified plans Add plywood dihedral braces main panels should have no warps tips should have small amount wash-out Add re maining straight geodetic ribs dihedral breaks Glue center planking gussets Apply two coats clear dope entire structure sand lightly Cover Japanese tissue apply three coats thinned clear dope Apply final coat K&B epoxy clear paint especially nlanning use high-nitro fuels Stab construction very similar wing additional instruction necessary Finish same manner wing Add 1/32-in wire hold-down hook brass DT hook reinforcement Start fuselage construction assem bling pylon fin Cut fuse lage sides size 1/32-in firm Cgrain stock Pin right fuselage side plans Glue right side 1/16 x top bottom 1/16 X onals Add pylon fin left fuselage side Remove fuselage plans add balsa cheeks Select engine mount drill appropriate holes -in plywood firewall Install blind mounting nuts firewall epoxy firewall fuselage Add 1/16-in plywood timer-mount ing plate wing platform Install stab platform small amount tilt righthand glide Apply two coats clear dope entire fuselage sand lightly Cover fuselage Japanese tissue finish three coats clear dope final coat K&B epoxy Install aluminum snuffer tube DT wire alumi num DT guide tubes sure guide tube stab hold down area posi July1975 33 Contrasting colors covering material make pretty airplane Jap tissue given three thinned clear dope final K&B epoxy clear paintstands up high-nitro fuels Curved portions tips stab edges built up 1/16 x 1/8 laminations tioned hold-down rubber bands pass over tube Install mount engine timer pacifier tank Finish plane keying stab wing wing should keyed right wing leads left wing approximately 3/16in Positioning wing manner eliminates need wash-in right wing panel recommend 5-3 Cox gray prop Check balance point. should fall 75-80 percent range add weight accordingly Hand glide model adjust proper incidence glide turn Make first test flight engine running rich timer set about two seconds Continue test flying gradually increasing power engine run until plane adjusted steep righthand climb smooth transition right glide II/IA PLY BRACE II Iii TOP AND BOTTOM /I / II IFIX6PLYBRACE LIZZZZIZiIiZiL _____ I/IA SHEET DIAGONAL WSJG RIbS I/IS SHEET WING RIBS rIiZZZIZh1EZzzzz7~ I/IA SHEET DIAGONAL STAB RIBS I/ WIRE HOOK. 11W SHEET STAB RIBS OPTIONAL TIP /IBIII/BSPRtJCE I/IA PLYWOODI/B SHEET TISER MOUNT/' I J / RAFTH4YES MOJNTT MER 7/ 1/32 WIRE WASHER0 N 1/4 ALUM TIJENG BALSA BLOCKS I/A PLY / I/IA BALSA PLATFORM I/B SHEET BRACES 1/32 SHEET / I/IA PLY 7 $1 ____ I/B PLY -- 4-z-r. 117 BALSA FILL--I/IA I/B RUNNERS /1/32 SIDES / THE FRENCH WENCH 34 Model Aviation Dethermalizer tilting stabilizer mounted ahead fin Plc shows actuated position its trailing edge elevated steep descent Plans make clear stop mount prove validity concept Mateer scaled job up B version area 560 squares rear-rotor 29 1/4 1/4 LE i/ia I/S SPAR TOP AND BOTTOM ALL RIBS 1/16 SHEET / I/IS SHEET GUSSETS // I/B 1/2 TE TIPS LAMINATEO FROM 1/16 1/4 STRIPS LE LAMINATED FROM I/IS 3/IS STRIPS AVK 7 3/32 50 SPARS K I/IS SHEET RIBS / SWE 1400 CENTER RIB I/B SHEET TE LAMINATED FROM 1/16 I/B STRIPS 2- I/S DETAILSBALSA BLOCK 1/32 WIRE LOOPi/i / Il/fl -u VIe ALUM TUBING B TOP SOT TOM1 DT LINE VIZ I/IS PLY 'Ii } / SHEET / S I/IS I/B SPRUCE L E Li I/S BALSA PLOC / DESIGNED BY DALE E MATEER 012 Inches 456 July1975 35 IS I/B SPAR 7 / /4 I- BALSA PILL
Edition: Model Aviation - 1975/07
Page Numbers: 32, 33, 34, 35
IIIREXDETh K1IEXDETh Powered Cox Tee Dee above-average Free Flight designed meet list demanding righton requirementsthus avoiding outmoded method bending airframe series modifications Designed Dale E Mateer Text Mateer Jerry W Barnette NEW MODEL design must have reason being better performance bet ter construction myriad other reasons Another truism sooner later free fighters get itch roll own advance Free-Flight state art designing own fly ing machine Thus birth French Wench systematic approach taken new design Rather drawing nice sporty-looking airplane followed countless modifications redesigns make perform adequately form-fol lows-function approach adopted set design objectives established features satisfied ob jectives would determine what final de sign would look like approach mind following design objectives established Light weight one-pound brick flies better 20-pound brick Fast climb Because fly mostly Category II contests East Coast brisk climb required short engine runs well fly-off flights Good glide good glide prime requirement contest Free-Flight model Warp-free construction must constantly check warps retrim model because something basically wrong design Now have objectives achieve goals approach meeting light-weight criteria very careful selection wood through efficient design controlling amount wood airplane means some what smaller wood sizes normally used same time exercising great care make airplane too flimsy medium- small-to-medium size model selected smaller wood sizes proper grain selection can used safely technique easily seen fuselage construction ap proach also applied wing stab design Because wings weight spanwise parts area attempting weight reduction view number size spars reduced minimum However number size spars cannot reduced too much because wing will prone warp bings up point warp-free construction medium-small fast light-weight Free-Flight model wing stab must built true warp free weak wing stab warps changes its trim will result either disaster mediocre per formance So reduce num ber size spars still maintain strong warp-free wing stab light-weight model geodetic construction answer 1/16 x spars may appear anemic quite ade quate geodetic layout 1/32-in sheet fuselage sides may also appear undersize result very strong C-grain wood used tissue covered 32 Model Aviation Warp-free construction requisite good competition free flight minimize elimi nate such annoyances designer used geodetic construction both wing stabilizer sun shining through flying surfaces pic above makes obvious feature Below Timer pinches off fuel pacifier tank activates OT line addition slight theoretical ad vantage elliptical tips add strength area help reduce weight opposed use rectangular tips fast-climb requirement met overall wing size 248 sq area use thin airfoil light-weight construction course hot Cox Tee Dee fed high nitro fuel pressurized pacifier turning small prop also helps use rear fin directly adding speed climb contributes better power pattern As glide requirement achieving light-weight objective having 5 ounce all-up airplane helps glide con siderably course other design factors also contribute example moderate aspect ratio 78 31 percent stab efficiently sized tail moment etc Theory logic very good question does work case French Wench answer yes design does result very light-weight model warp free has floating glide has impressive rapid climb wins contests another nice feature further prove validity con cept design scaled up B-Gas size 560 sq 24 oz K&B 29 rear rotor shown photos B-job did prove soundness design impressive performer should noted despite rapid climb power pattern very safe both sizes name French Wench Orig inally design nameless After model flew well won few contests decided give design name its own what call Much thought research went finding appro priate descriptive pleasant sounding name new bird Friends asked contribute names Weeks went finding right name evening during hangar flying session some friends wife dropped some coffee Hearing name dilemma wife said French Wench great unwritten rules never argues bringer coffee wife Construction wing straight forward con struction Using plywood metal tem plate cut out straight geodetic ribs light-weight C-grain stock Cut h-in wide strips /8-in wide strips tip leading trailing edge lami nations Notch trailing edges main panels pin plans Pin leading edges lower spar plans Medium-hard stock should used main panel leading edges trailing edges spars Use Hot Stuff adhesive Tite Bond glue construction begin construction laminate tip leading edges trailing edges Establish lamination guide placing pins about -in apart plans around inner trailing leading edge outlines Pin balsa tip blocks place Bend first lamination around pins glue tip block Hot Stuff Continue procedure adding strip time until laminations glued place Pin lower tip spar plans Glue straight ribs except dihedral breaks Add top main spar geo detic ribs remaining top spar Remove main tip panels plans sand shape using spars tip panels guide Prepare join panels sanding leading edges trailing edges proper angles Epoxy dihedral polyhedral joints angles specified plans Add plywood dihedral braces main panels should have no warps tips should have small amount wash-out Add re maining straight geodetic ribs dihedral breaks Glue center planking gussets Apply two coats clear dope entire structure sand lightly Cover Japanese tissue apply three coats thinned clear dope Apply final coat K&B epoxy clear paint especially nlanning use high-nitro fuels Stab construction very similar wing additional instruction necessary Finish same manner wing Add 1/32-in wire hold-down hook brass DT hook reinforcement Start fuselage construction assem bling pylon fin Cut fuse lage sides size 1/32-in firm Cgrain stock Pin right fuselage side plans Glue right side 1/16 x top bottom 1/16 X onals Add pylon fin left fuselage side Remove fuselage plans add balsa cheeks Select engine mount drill appropriate holes -in plywood firewall Install blind mounting nuts firewall epoxy firewall fuselage Add 1/16-in plywood timer-mount ing plate wing platform Install stab platform small amount tilt righthand glide Apply two coats clear dope entire fuselage sand lightly Cover fuselage Japanese tissue finish three coats clear dope final coat K&B epoxy Install aluminum snuffer tube DT wire alumi num DT guide tubes sure guide tube stab hold down area posi July1975 33 Contrasting colors covering material make pretty airplane Jap tissue given three thinned clear dope final K&B epoxy clear paintstands up high-nitro fuels Curved portions tips stab edges built up 1/16 x 1/8 laminations tioned hold-down rubber bands pass over tube Install mount engine timer pacifier tank Finish plane keying stab wing wing should keyed right wing leads left wing approximately 3/16in Positioning wing manner eliminates need wash-in right wing panel recommend 5-3 Cox gray prop Check balance point. should fall 75-80 percent range add weight accordingly Hand glide model adjust proper incidence glide turn Make first test flight engine running rich timer set about two seconds Continue test flying gradually increasing power engine run until plane adjusted steep righthand climb smooth transition right glide II/IA PLY BRACE II Iii TOP AND BOTTOM /I / II IFIX6PLYBRACE LIZZZZIZiIiZiL _____ I/IA SHEET DIAGONAL WSJG RIbS I/IS SHEET WING RIBS rIiZZZIZh1EZzzzz7~ I/IA SHEET DIAGONAL STAB RIBS I/ WIRE HOOK. 11W SHEET STAB RIBS OPTIONAL TIP /IBIII/BSPRtJCE I/IA PLYWOODI/B SHEET TISER MOUNT/' I J / RAFTH4YES MOJNTT MER 7/ 1/32 WIRE WASHER0 N 1/4 ALUM TIJENG BALSA BLOCKS I/A PLY / I/IA BALSA PLATFORM I/B SHEET BRACES 1/32 SHEET / I/IA PLY 7 $1 ____ I/B PLY -- 4-z-r. 117 BALSA FILL--I/IA I/B RUNNERS /1/32 SIDES / THE FRENCH WENCH 34 Model Aviation Dethermalizer tilting stabilizer mounted ahead fin Plc shows actuated position its trailing edge elevated steep descent Plans make clear stop mount prove validity concept Mateer scaled job up B version area 560 squares rear-rotor 29 1/4 1/4 LE i/ia I/S SPAR TOP AND BOTTOM ALL RIBS 1/16 SHEET / I/IS SHEET GUSSETS // I/B 1/2 TE TIPS LAMINATEO FROM 1/16 1/4 STRIPS LE LAMINATED FROM I/IS 3/IS STRIPS AVK 7 3/32 50 SPARS K I/IS SHEET RIBS / SWE 1400 CENTER RIB I/B SHEET TE LAMINATED FROM 1/16 I/B STRIPS 2- I/S DETAILSBALSA BLOCK 1/32 WIRE LOOPi/i / Il/fl -u VIe ALUM TUBING B TOP SOT TOM1 DT LINE VIZ I/IS PLY 'Ii } / SHEET / S I/IS I/B SPRUCE L E Li I/S BALSA PLOC / DESIGNED BY DALE E MATEER 012 Inches 456 July1975 35 IS I/B SPAR 7 / /4 I- BALSA PILL