THROTTLE CONTROL ability con trol speed flight impor tant features can incorporate Scale models allows us take off land taxi models much same manner full-scale prototype major problem installing throttle linkage between bellerank engine throttle control arm getting past fuel tank generally mounted just ahead belicrank accompanying sketch shows possible stallation example use upright-mounted en gine inverted three-line bellerank mounted upright bellcrank engine throttle control arms traveling same direction high low speed engine mounted upright position seems little problem install ing music wire throttle linkage slight bend wire allows us pass outboard side fuel tank almost straight line engine throttle arm An adjustable connector stalled link engine end sol der link Z-bend shown sketch can used make connection bellerank end Z-bend used sketch inset shows brass washer soldered bend helps greatly steadying Z-bend connection soldered-on quick-link connector used remem ber use piece tubing over connector keep opening up disengaging might also have make bend vertically linkage see linkage side view adjustment sketch illustrates basic routing pushrod between three-line bellcrank throttle arm engine problems might encountered getting fuel tank bellerank mounted low-wing model determine length throttle link place bellerank high-speed position bellerank throttle arm forward engine throttle full-open position engine throttle arm forward bellerank engine throttle arms positions linkage should long enough have adjustable connector screwed midway onto threads permits fine adjustments linkage length allowing full travel throttle engine mounted inverted can see heavy dashed line sketch linkage bends become somewhat tricky solu tion might use plastic metal flexible ca ble linkage type linkage used care must taken make very sharp bends cause considerable internal friction cable want keep controls frictionfree possible Another solution problem getting around fuel tank inverted-engine stallation would use both upright intermediate bellerank shown dotted lines sketch direction linkage travel matches engine throttle arm high low speeds As can see possible number ways install throttle linkage Certain sit uations may require use two intermediate April 1990 67 Control Line Scale Bill Boss 77-06 269th Street New Hyde Park NY 1040 Typhoon lB Joe Sroczyk Philadelphia PA model has 40-in wingspan requires Fox 45 keep its 9 lb airborne plane flies surprisingly well Bill Boss photo K THROTTLE LINKAGE-SIDE VIEW ADJUSTABLE CONNECTORFIREWALL THROTTLE LINKAGE L-R BELLCCANK FiUT1,- 0[IAJ e / INTERMEDIATE THROTTLE LINKBELLCRANK IF LOCATION FORREQUIREDSOLDER INVERTED ENGINEBRASS WASHER SELICRANK Continued page 165 Bob Furr Orbiting Eagles Omaha shown Profile Scale rendition Japanese Tony started Sig Twister Seven-year-old Robert Ludwigsen Roselle NJ shows off Profile P-40 done up camouflage paint scheme An 05 15 used power first competition young Robert won Best Junior Award Photo taken GSCB Annual CL Scale Rally Bill Boss Waco SRE work Al Gluck Den ver Its stable flier winds Photo taken 89 Denver Scale Meet Bob Furr holds surfaces alignment paint takes permanent set jig consists some scrap particle board plywood approximately 30 long Draw straight line down middle board length wise Glue piece -in-sq balsa line side piece will straight line fixture Next take another piece -in-sq balsa bevel side will glued down board thereby forming tapered slot between master piece balsa Measure separation space will cradle trail ing edge flap going put slot snugly holding dead straight al lowing trailing edge touch base plate fixture same other side first h-in-sq piece balsa will give two parallel slots insert flaps Give flaps another coat paint allow set up about 20 30 minutes sert flaps trailing edge first drying jig Push just enough get firm hold will see flap form straight edge jig Let set up overnight should have good Set flaps Note may have re peat procedure several coats paint does work persistent CL Scale/Boss Continued page 67 bellcranks might also possible change position engine throttle arm loosening screw rotating arm 1800 obtain travel direction matching bellcrank being used possible way determining what type link age would best particular model might make mockup breadboard-type installa tion Place engine tank bellcrank breadboard based dimensions man ner will installed model can now try alternate forms throttle linkage determine type would work best model trial error better per formed breadboard rather mo del Once again would like thank Gerry De neau thoughts ideas used months throttle linkage item Notes NASA much talked about least column Scale Data Source List complete being shipped National Associ ation Scale Aeromodelers NASA members dues paid up through 1990 Scale Data Source List primarily Made America American Technology VMODEL ENt3tNES RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Forster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin work Claude McCullough committee consisted Phil Renfro Kenneth R Smith Jeff Whitney Bob Banka thanks Claude committee hours contributed project source list covers very wide selection data sources government agencies muse ums libraries photographs aircraft draw ings periodicals aviation book dealers tech man uals Scale model construction drawings paid up 1990 member NASA would good time get dues become member Dues cost $8 New members receive patch decal Scale Data Source List NASA newslet ter Replica As member will getting some very valuable information will supporting facets Scale aeromodeling USA Renew join now Send dues NASA Secretary Bert Dugan 11090 Phyllis Dr Clio MI 48420 would also like note Mike Welshans dedicated CL Scale modeler frequent contrib utor column has become associate edi tor NASA newsletter am sure NASA members can look forward seeing CL Scale newsletter addition sending items use column might want drop Mike line now let him know whats happening CL Scale area Good luck Mike new endeavor Bob Furr Orbiting Eagles Omaha back month some very help ful hints workshop Bob points out have never taken casual stroll through well-stocked hardware store have missed out unusual source model supplies entertaining afternoon know hard ware stores carry tools good can also provide model construction materials nonstop variety odds ends Tools metal supplies area store youll find item modelers can use time another thrust wedges Theyre found aisle has replacement handles axes used hold head place hardwood wedges just happen make Out standing thrust wedges available vari ety sizes Another item found tools section 36-in metal ruler always handy workshop However times need straightedge thats longer three feet Bob sug gests using aluminum bar stock avail able lengths up eight feet Its about 3/ thick comes widths di tion bar stock can cut shape form metal engine mounting plate will increase SPORT FREE-FLIGHT ORSMALLRC K/ Y[ II Watt Sigh ttticiersy Motor Versatile & Light Weight /7o 2003 tel Operation /7/!CandIes 1 lao 250in Models 6/7 Z7 PRECISION MODEL PRODUCTS Made U S BARSTOCK ALUMINUM SPINNERS RelailApprox Part NoSize Price Weight 11-150-8'1-112$1395058oz TT-175-B.. 1-3141495095oz 11-200-B1595100oz TI225-B.. 2114159516002 TT-226-B 4 FAIl 1895150oz 11-250-B.. 21121895.. 1 90oz TI-251-B 2-112FAI 2095.. 170oz TT-275-B . 2-3142295.. 220oz 11-276-B 314FAt . 200oz 11-300-B 02 TT301-B FAt . 2 11-325-B . 3-1/4 95 . 34002 TT-350-B. 31/24995 2 TT-375-B 4 . 5995 . 2 11-400-B . 6995 2 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add S3OO Per Spinner RetailApprox PriceWeight S495 . 0 61 02 49506102 495063 02 4 95082 02 49507602 49507602 49507602 49507502 595.11702 59511502 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 April 1990 165 PROP NUT ADAPTORS V Part NoSize TT-140-A .. 114-28 TT147-A 1/4-2817mm 11-610-A 6x 1 0mm TI-710-A 10mm TT-516-A 5/16-24 11-518-A 5/16-24/8mm TT-810-AOx 10mm 11825-A8 x 1 25mm 11-375-A318-24 TT125-AlOx 125mm Colt wrote free information RJL Industries PO Box 5 Sierra Ma&e CA 91025 818 359-0016 swd5t Ia aptt Ca 1 cy Conversion $3500 Includes Crystals Certification Special Fast Turnaround Now Available CALL Send Large Self AddressedUPS US Mail Federal Express Used Envelope BrochuresMastercard Visa Accepted strength engine mounts reduce ef fects vibration profile model plate should roughly C -shaped mounted firmly model Paint department Some hardware stores still give away paint stirring sticks wooden yard sticks yardsticks make excellent hardwood wing spars paint stirring sticks make very good tail booms Fast Combat planes Bob also notes yardstick can work well measuring paint stirrers can used mixing paint Next month visit lumber nuts-andbolts departments Bob has also asked note anyone inter ested receiving Orbiting Eagles Newsletter yearly basis can sending name address AMA number $10 Orbiting Ea gles Newsletter 8147 Read Street Omaha NB 68122 Please send ideas commentsand especially photos CL Scale activityto address very top column CL Navy Carrier/Perry Continued page 68 years membership Navy Carrier Society Mail entries address shown byline Airfoil selection occasionally receive ques tions about airfoils best used Carrier models Unlike Free Flight Glider frater nity has considerable information air foil performance relatively low Reynolds numbers fly Carrier modelers have little experimental data guide us Most original information airfoil sections com piled National Advisory Committee Aeronautics NACA Reynolds numbers ap propriate full-size aircraft What little infor mation available airfoils interest us leads some general conclusions specific recommendations general guidelines use airfoils built-up wings should about 9-12% thick Solid wings should thinner thin 5% save weight should have round leading edges 11 times square thickness using NACA formula Thus 12%-thick airfoil should have leading edge radius 16% chord ie 12%-thick wing section 8tn chord would thick leading edge radius / Exact airfoil shapes critical long both upper lower surfaces have smooth con tours Ive found drafting curves good airfoil tables plotting sections Unless lot extra time effort go building pro cess finished wing section wont accu rate representation what planned Observation models used Carrier events will show Class Class 11 models use cambered airfoils Profile models use symmetrical sections some notableand highly successfulProfile excep tions Bill Meltons Guardian Harry Higleys Mo-Ho Carrier Pigeon Carlos Aloises Condor designs quite successful used cambered airfoils general cambered airfoil will have mini mum drag flying zero angle tack means line through leading trailing edges lined up airflow properly designed Carrier wing has just enough camber produce needed lift ti airplanes weight speed near ze incidence exact camber required will depend up weight wing area speed altitude temperatur flying height few other factors Fort nately airfoils tolerant small deviation minimum-drag section fairly consiste Carrier models Large light Profiles end spectrum small heas Class II ships other end Another factor consider drag can r duced lift smoothly drops zero ti1 cant happen rectangular wing constant airfoil section constant incidence works rather well wings change froi lifting sections root symmetrical sectior tip design wings tip syn metrical flying zero incidence di model its top speed Some people like fly close ma mum allowable height 20 ft can TI idea model flies smaller circle therefore earns greater high-speed scoreevi though actual speed same ata low height doesnt work energy consumed climbing greater height slows acceleratio extra lift required slows top speei increased lift depends upon speed model 20 ft requires 35 5 times lift model flying 5 ft typical Carrier mat el losses exceed anticipated gain froi flying shorter circle try fly height 5 ft try design m planes way too us mot comfortable flying about 10 ft heigh typical Profile would need root camber 2% typical Class II model would require root camber 3% numbers based o 166 Model Aviation Electric Flight f Controller Perfect 05 Motors 5-10 cells Has Brake2 month Lightweight 12 00money back Adjustable switching point Soidertess tenninal tor easy hookupguarantee ON/OFF Controller $2495 Power save weight 20 Size 22st3s63 Very high efficiency 006V loss Add 1100 fan skipping Cojifornia residents add 65% S163 Tao Send Check money order ComoooihIfHigh Sky Fntobaoosseetor ow3929 Kansas St #9 otheoooae7o5ijs seeSan DiegoCA 92104 Service Ace Cirrus EK Futaba Heathkit Hobbyshack JR KGL ___________________________________ K-Line KO Propo Kraft KSE Logitrol Novak Royal Tower Hobbies World Engines . Spectrum Analyzers CalIbrated Test Instruments Large Inventory R/C [ Parts- Crystals
Edition: Model Aviation - 1990/04
Page Numbers: 67, 165, 166
THROTTLE CONTROL ability con trol speed flight impor tant features can incorporate Scale models allows us take off land taxi models much same manner full-scale prototype major problem installing throttle linkage between bellerank engine throttle control arm getting past fuel tank generally mounted just ahead belicrank accompanying sketch shows possible stallation example use upright-mounted en gine inverted three-line bellerank mounted upright bellcrank engine throttle control arms traveling same direction high low speed engine mounted upright position seems little problem install ing music wire throttle linkage slight bend wire allows us pass outboard side fuel tank almost straight line engine throttle arm An adjustable connector stalled link engine end sol der link Z-bend shown sketch can used make connection bellerank end Z-bend used sketch inset shows brass washer soldered bend helps greatly steadying Z-bend connection soldered-on quick-link connector used remem ber use piece tubing over connector keep opening up disengaging might also have make bend vertically linkage see linkage side view adjustment sketch illustrates basic routing pushrod between three-line bellcrank throttle arm engine problems might encountered getting fuel tank bellerank mounted low-wing model determine length throttle link place bellerank high-speed position bellerank throttle arm forward engine throttle full-open position engine throttle arm forward bellerank engine throttle arms positions linkage should long enough have adjustable connector screwed midway onto threads permits fine adjustments linkage length allowing full travel throttle engine mounted inverted can see heavy dashed line sketch linkage bends become somewhat tricky solu tion might use plastic metal flexible ca ble linkage type linkage used care must taken make very sharp bends cause considerable internal friction cable want keep controls frictionfree possible Another solution problem getting around fuel tank inverted-engine stallation would use both upright intermediate bellerank shown dotted lines sketch direction linkage travel matches engine throttle arm high low speeds As can see possible number ways install throttle linkage Certain sit uations may require use two intermediate April 1990 67 Control Line Scale Bill Boss 77-06 269th Street New Hyde Park NY 1040 Typhoon lB Joe Sroczyk Philadelphia PA model has 40-in wingspan requires Fox 45 keep its 9 lb airborne plane flies surprisingly well Bill Boss photo K THROTTLE LINKAGE-SIDE VIEW ADJUSTABLE CONNECTORFIREWALL THROTTLE LINKAGE L-R BELLCCANK FiUT1,- 0[IAJ e / INTERMEDIATE THROTTLE LINKBELLCRANK IF LOCATION FORREQUIREDSOLDER INVERTED ENGINEBRASS WASHER SELICRANK Continued page 165 Bob Furr Orbiting Eagles Omaha shown Profile Scale rendition Japanese Tony started Sig Twister Seven-year-old Robert Ludwigsen Roselle NJ shows off Profile P-40 done up camouflage paint scheme An 05 15 used power first competition young Robert won Best Junior Award Photo taken GSCB Annual CL Scale Rally Bill Boss Waco SRE work Al Gluck Den ver Its stable flier winds Photo taken 89 Denver Scale Meet Bob Furr holds surfaces alignment paint takes permanent set jig consists some scrap particle board plywood approximately 30 long Draw straight line down middle board length wise Glue piece -in-sq balsa line side piece will straight line fixture Next take another piece -in-sq balsa bevel side will glued down board thereby forming tapered slot between master piece balsa Measure separation space will cradle trail ing edge flap going put slot snugly holding dead straight al lowing trailing edge touch base plate fixture same other side first h-in-sq piece balsa will give two parallel slots insert flaps Give flaps another coat paint allow set up about 20 30 minutes sert flaps trailing edge first drying jig Push just enough get firm hold will see flap form straight edge jig Let set up overnight should have good Set flaps Note may have re peat procedure several coats paint does work persistent CL Scale/Boss Continued page 67 bellcranks might also possible change position engine throttle arm loosening screw rotating arm 1800 obtain travel direction matching bellcrank being used possible way determining what type link age would best particular model might make mockup breadboard-type installa tion Place engine tank bellcrank breadboard based dimensions man ner will installed model can now try alternate forms throttle linkage determine type would work best model trial error better per formed breadboard rather mo del Once again would like thank Gerry De neau thoughts ideas used months throttle linkage item Notes NASA much talked about least column Scale Data Source List complete being shipped National Associ ation Scale Aeromodelers NASA members dues paid up through 1990 Scale Data Source List primarily Made America American Technology VMODEL ENt3tNES RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Forster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin work Claude McCullough committee consisted Phil Renfro Kenneth R Smith Jeff Whitney Bob Banka thanks Claude committee hours contributed project source list covers very wide selection data sources government agencies muse ums libraries photographs aircraft draw ings periodicals aviation book dealers tech man uals Scale model construction drawings paid up 1990 member NASA would good time get dues become member Dues cost $8 New members receive patch decal Scale Data Source List NASA newslet ter Replica As member will getting some very valuable information will supporting facets Scale aeromodeling USA Renew join now Send dues NASA Secretary Bert Dugan 11090 Phyllis Dr Clio MI 48420 would also like note Mike Welshans dedicated CL Scale modeler frequent contrib utor column has become associate edi tor NASA newsletter am sure NASA members can look forward seeing CL Scale newsletter addition sending items use column might want drop Mike line now let him know whats happening CL Scale area Good luck Mike new endeavor Bob Furr Orbiting Eagles Omaha back month some very help ful hints workshop Bob points out have never taken casual stroll through well-stocked hardware store have missed out unusual source model supplies entertaining afternoon know hard ware stores carry tools good can also provide model construction materials nonstop variety odds ends Tools metal supplies area store youll find item modelers can use time another thrust wedges Theyre found aisle has replacement handles axes used hold head place hardwood wedges just happen make Out standing thrust wedges available vari ety sizes Another item found tools section 36-in metal ruler always handy workshop However times need straightedge thats longer three feet Bob sug gests using aluminum bar stock avail able lengths up eight feet Its about 3/ thick comes widths di tion bar stock can cut shape form metal engine mounting plate will increase SPORT FREE-FLIGHT ORSMALLRC K/ Y[ II Watt Sigh ttticiersy Motor Versatile & Light Weight /7o 2003 tel Operation /7/!CandIes 1 lao 250in Models 6/7 Z7 PRECISION MODEL PRODUCTS Made U S BARSTOCK ALUMINUM SPINNERS RelailApprox Part NoSize Price Weight 11-150-8'1-112$1395058oz TT-175-B.. 1-3141495095oz 11-200-B1595100oz TI225-B.. 2114159516002 TT-226-B 4 FAIl 1895150oz 11-250-B.. 21121895.. 1 90oz TI-251-B 2-112FAI 2095.. 170oz TT-275-B . 2-3142295.. 220oz 11-276-B 314FAt . 200oz 11-300-B 02 TT301-B FAt . 2 11-325-B . 3-1/4 95 . 34002 TT-350-B. 31/24995 2 TT-375-B 4 . 5995 . 2 11-400-B . 6995 2 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add S3OO Per Spinner RetailApprox PriceWeight S495 . 0 61 02 49506102 495063 02 4 95082 02 49507602 49507602 49507602 49507502 595.11702 59511502 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 April 1990 165 PROP NUT ADAPTORS V Part NoSize TT-140-A .. 114-28 TT147-A 1/4-2817mm 11-610-A 6x 1 0mm TI-710-A 10mm TT-516-A 5/16-24 11-518-A 5/16-24/8mm TT-810-AOx 10mm 11825-A8 x 1 25mm 11-375-A318-24 TT125-AlOx 125mm Colt wrote free information RJL Industries PO Box 5 Sierra Ma&e CA 91025 818 359-0016 swd5t Ia aptt Ca 1 cy Conversion $3500 Includes Crystals Certification Special Fast Turnaround Now Available CALL Send Large Self AddressedUPS US Mail Federal Express Used Envelope BrochuresMastercard Visa Accepted strength engine mounts reduce ef fects vibration profile model plate should roughly C -shaped mounted firmly model Paint department Some hardware stores still give away paint stirring sticks wooden yard sticks yardsticks make excellent hardwood wing spars paint stirring sticks make very good tail booms Fast Combat planes Bob also notes yardstick can work well measuring paint stirrers can used mixing paint Next month visit lumber nuts-andbolts departments Bob has also asked note anyone inter ested receiving Orbiting Eagles Newsletter yearly basis can sending name address AMA number $10 Orbiting Ea gles Newsletter 8147 Read Street Omaha NB 68122 Please send ideas commentsand especially photos CL Scale activityto address very top column CL Navy Carrier/Perry Continued page 68 years membership Navy Carrier Society Mail entries address shown byline Airfoil selection occasionally receive ques tions about airfoils best used Carrier models Unlike Free Flight Glider frater nity has considerable information air foil performance relatively low Reynolds numbers fly Carrier modelers have little experimental data guide us Most original information airfoil sections com piled National Advisory Committee Aeronautics NACA Reynolds numbers ap propriate full-size aircraft What little infor mation available airfoils interest us leads some general conclusions specific recommendations general guidelines use airfoils built-up wings should about 9-12% thick Solid wings should thinner thin 5% save weight should have round leading edges 11 times square thickness using NACA formula Thus 12%-thick airfoil should have leading edge radius 16% chord ie 12%-thick wing section 8tn chord would thick leading edge radius / Exact airfoil shapes critical long both upper lower surfaces have smooth con tours Ive found drafting curves good airfoil tables plotting sections Unless lot extra time effort go building pro cess finished wing section wont accu rate representation what planned Observation models used Carrier events will show Class Class 11 models use cambered airfoils Profile models use symmetrical sections some notableand highly successfulProfile excep tions Bill Meltons Guardian Harry Higleys Mo-Ho Carrier Pigeon Carlos Aloises Condor designs quite successful used cambered airfoils general cambered airfoil will have mini mum drag flying zero angle tack means line through leading trailing edges lined up airflow properly designed Carrier wing has just enough camber produce needed lift ti airplanes weight speed near ze incidence exact camber required will depend up weight wing area speed altitude temperatur flying height few other factors Fort nately airfoils tolerant small deviation minimum-drag section fairly consiste Carrier models Large light Profiles end spectrum small heas Class II ships other end Another factor consider drag can r duced lift smoothly drops zero ti1 cant happen rectangular wing constant airfoil section constant incidence works rather well wings change froi lifting sections root symmetrical sectior tip design wings tip syn metrical flying zero incidence di model its top speed Some people like fly close ma mum allowable height 20 ft can TI idea model flies smaller circle therefore earns greater high-speed scoreevi though actual speed same ata low height doesnt work energy consumed climbing greater height slows acceleratio extra lift required slows top speei increased lift depends upon speed model 20 ft requires 35 5 times lift model flying 5 ft typical Carrier mat el losses exceed anticipated gain froi flying shorter circle try fly height 5 ft try design m planes way too us mot comfortable flying about 10 ft heigh typical Profile would need root camber 2% typical Class II model would require root camber 3% numbers based o 166 Model Aviation Electric Flight f Controller Perfect 05 Motors 5-10 cells Has Brake2 month Lightweight 12 00money back Adjustable switching point Soidertess tenninal tor easy hookupguarantee ON/OFF Controller $2495 Power save weight 20 Size 22st3s63 Very high efficiency 006V loss Add 1100 fan skipping Cojifornia residents add 65% S163 Tao Send Check money order ComoooihIfHigh Sky Fntobaoosseetor ow3929 Kansas St #9 otheoooae7o5ijs seeSan DiegoCA 92104 Service Ace Cirrus EK Futaba Heathkit Hobbyshack JR KGL ___________________________________ K-Line KO Propo Kraft KSE Logitrol Novak Royal Tower Hobbies World Engines . Spectrum Analyzers CalIbrated Test Instruments Large Inventory R/C [ Parts- Crystals
Edition: Model Aviation - 1990/04
Page Numbers: 67, 165, 166
THROTTLE CONTROL ability con trol speed flight impor tant features can incorporate Scale models allows us take off land taxi models much same manner full-scale prototype major problem installing throttle linkage between bellerank engine throttle control arm getting past fuel tank generally mounted just ahead belicrank accompanying sketch shows possible stallation example use upright-mounted en gine inverted three-line bellerank mounted upright bellcrank engine throttle control arms traveling same direction high low speed engine mounted upright position seems little problem install ing music wire throttle linkage slight bend wire allows us pass outboard side fuel tank almost straight line engine throttle arm An adjustable connector stalled link engine end sol der link Z-bend shown sketch can used make connection bellerank end Z-bend used sketch inset shows brass washer soldered bend helps greatly steadying Z-bend connection soldered-on quick-link connector used remem ber use piece tubing over connector keep opening up disengaging might also have make bend vertically linkage see linkage side view adjustment sketch illustrates basic routing pushrod between three-line bellcrank throttle arm engine problems might encountered getting fuel tank bellerank mounted low-wing model determine length throttle link place bellerank high-speed position bellerank throttle arm forward engine throttle full-open position engine throttle arm forward bellerank engine throttle arms positions linkage should long enough have adjustable connector screwed midway onto threads permits fine adjustments linkage length allowing full travel throttle engine mounted inverted can see heavy dashed line sketch linkage bends become somewhat tricky solu tion might use plastic metal flexible ca ble linkage type linkage used care must taken make very sharp bends cause considerable internal friction cable want keep controls frictionfree possible Another solution problem getting around fuel tank inverted-engine stallation would use both upright intermediate bellerank shown dotted lines sketch direction linkage travel matches engine throttle arm high low speeds As can see possible number ways install throttle linkage Certain sit uations may require use two intermediate April 1990 67 Control Line Scale Bill Boss 77-06 269th Street New Hyde Park NY 1040 Typhoon lB Joe Sroczyk Philadelphia PA model has 40-in wingspan requires Fox 45 keep its 9 lb airborne plane flies surprisingly well Bill Boss photo K THROTTLE LINKAGE-SIDE VIEW ADJUSTABLE CONNECTORFIREWALL THROTTLE LINKAGE L-R BELLCCANK FiUT1,- 0[IAJ e / INTERMEDIATE THROTTLE LINKBELLCRANK IF LOCATION FORREQUIREDSOLDER INVERTED ENGINEBRASS WASHER SELICRANK Continued page 165 Bob Furr Orbiting Eagles Omaha shown Profile Scale rendition Japanese Tony started Sig Twister Seven-year-old Robert Ludwigsen Roselle NJ shows off Profile P-40 done up camouflage paint scheme An 05 15 used power first competition young Robert won Best Junior Award Photo taken GSCB Annual CL Scale Rally Bill Boss Waco SRE work Al Gluck Den ver Its stable flier winds Photo taken 89 Denver Scale Meet Bob Furr holds surfaces alignment paint takes permanent set jig consists some scrap particle board plywood approximately 30 long Draw straight line down middle board length wise Glue piece -in-sq balsa line side piece will straight line fixture Next take another piece -in-sq balsa bevel side will glued down board thereby forming tapered slot between master piece balsa Measure separation space will cradle trail ing edge flap going put slot snugly holding dead straight al lowing trailing edge touch base plate fixture same other side first h-in-sq piece balsa will give two parallel slots insert flaps Give flaps another coat paint allow set up about 20 30 minutes sert flaps trailing edge first drying jig Push just enough get firm hold will see flap form straight edge jig Let set up overnight should have good Set flaps Note may have re peat procedure several coats paint does work persistent CL Scale/Boss Continued page 67 bellcranks might also possible change position engine throttle arm loosening screw rotating arm 1800 obtain travel direction matching bellcrank being used possible way determining what type link age would best particular model might make mockup breadboard-type installa tion Place engine tank bellcrank breadboard based dimensions man ner will installed model can now try alternate forms throttle linkage determine type would work best model trial error better per formed breadboard rather mo del Once again would like thank Gerry De neau thoughts ideas used months throttle linkage item Notes NASA much talked about least column Scale Data Source List complete being shipped National Associ ation Scale Aeromodelers NASA members dues paid up through 1990 Scale Data Source List primarily Made America American Technology VMODEL ENt3tNES RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Forster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin work Claude McCullough committee consisted Phil Renfro Kenneth R Smith Jeff Whitney Bob Banka thanks Claude committee hours contributed project source list covers very wide selection data sources government agencies muse ums libraries photographs aircraft draw ings periodicals aviation book dealers tech man uals Scale model construction drawings paid up 1990 member NASA would good time get dues become member Dues cost $8 New members receive patch decal Scale Data Source List NASA newslet ter Replica As member will getting some very valuable information will supporting facets Scale aeromodeling USA Renew join now Send dues NASA Secretary Bert Dugan 11090 Phyllis Dr Clio MI 48420 would also like note Mike Welshans dedicated CL Scale modeler frequent contrib utor column has become associate edi tor NASA newsletter am sure NASA members can look forward seeing CL Scale newsletter addition sending items use column might want drop Mike line now let him know whats happening CL Scale area Good luck Mike new endeavor Bob Furr Orbiting Eagles Omaha back month some very help ful hints workshop Bob points out have never taken casual stroll through well-stocked hardware store have missed out unusual source model supplies entertaining afternoon know hard ware stores carry tools good can also provide model construction materials nonstop variety odds ends Tools metal supplies area store youll find item modelers can use time another thrust wedges Theyre found aisle has replacement handles axes used hold head place hardwood wedges just happen make Out standing thrust wedges available vari ety sizes Another item found tools section 36-in metal ruler always handy workshop However times need straightedge thats longer three feet Bob sug gests using aluminum bar stock avail able lengths up eight feet Its about 3/ thick comes widths di tion bar stock can cut shape form metal engine mounting plate will increase SPORT FREE-FLIGHT ORSMALLRC K/ Y[ II Watt Sigh ttticiersy Motor Versatile & Light Weight /7o 2003 tel Operation /7/!CandIes 1 lao 250in Models 6/7 Z7 PRECISION MODEL PRODUCTS Made U S BARSTOCK ALUMINUM SPINNERS RelailApprox Part NoSize Price Weight 11-150-8'1-112$1395058oz TT-175-B.. 1-3141495095oz 11-200-B1595100oz TI225-B.. 2114159516002 TT-226-B 4 FAIl 1895150oz 11-250-B.. 21121895.. 1 90oz TI-251-B 2-112FAI 2095.. 170oz TT-275-B . 2-3142295.. 220oz 11-276-B 314FAt . 200oz 11-300-B 02 TT301-B FAt . 2 11-325-B . 3-1/4 95 . 34002 TT-350-B. 31/24995 2 TT-375-B 4 . 5995 . 2 11-400-B . 6995 2 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add S3OO Per Spinner RetailApprox PriceWeight S495 . 0 61 02 49506102 495063 02 4 95082 02 49507602 49507602 49507602 49507502 595.11702 59511502 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 April 1990 165 PROP NUT ADAPTORS V Part NoSize TT-140-A .. 114-28 TT147-A 1/4-2817mm 11-610-A 6x 1 0mm TI-710-A 10mm TT-516-A 5/16-24 11-518-A 5/16-24/8mm TT-810-AOx 10mm 11825-A8 x 1 25mm 11-375-A318-24 TT125-AlOx 125mm Colt wrote free information RJL Industries PO Box 5 Sierra Ma&e CA 91025 818 359-0016 swd5t Ia aptt Ca 1 cy Conversion $3500 Includes Crystals Certification Special Fast Turnaround Now Available CALL Send Large Self AddressedUPS US Mail Federal Express Used Envelope BrochuresMastercard Visa Accepted strength engine mounts reduce ef fects vibration profile model plate should roughly C -shaped mounted firmly model Paint department Some hardware stores still give away paint stirring sticks wooden yard sticks yardsticks make excellent hardwood wing spars paint stirring sticks make very good tail booms Fast Combat planes Bob also notes yardstick can work well measuring paint stirrers can used mixing paint Next month visit lumber nuts-andbolts departments Bob has also asked note anyone inter ested receiving Orbiting Eagles Newsletter yearly basis can sending name address AMA number $10 Orbiting Ea gles Newsletter 8147 Read Street Omaha NB 68122 Please send ideas commentsand especially photos CL Scale activityto address very top column CL Navy Carrier/Perry Continued page 68 years membership Navy Carrier Society Mail entries address shown byline Airfoil selection occasionally receive ques tions about airfoils best used Carrier models Unlike Free Flight Glider frater nity has considerable information air foil performance relatively low Reynolds numbers fly Carrier modelers have little experimental data guide us Most original information airfoil sections com piled National Advisory Committee Aeronautics NACA Reynolds numbers ap propriate full-size aircraft What little infor mation available airfoils interest us leads some general conclusions specific recommendations general guidelines use airfoils built-up wings should about 9-12% thick Solid wings should thinner thin 5% save weight should have round leading edges 11 times square thickness using NACA formula Thus 12%-thick airfoil should have leading edge radius 16% chord ie 12%-thick wing section 8tn chord would thick leading edge radius / Exact airfoil shapes critical long both upper lower surfaces have smooth con tours Ive found drafting curves good airfoil tables plotting sections Unless lot extra time effort go building pro cess finished wing section wont accu rate representation what planned Observation models used Carrier events will show Class Class 11 models use cambered airfoils Profile models use symmetrical sections some notableand highly successfulProfile excep tions Bill Meltons Guardian Harry Higleys Mo-Ho Carrier Pigeon Carlos Aloises Condor designs quite successful used cambered airfoils general cambered airfoil will have mini mum drag flying zero angle tack means line through leading trailing edges lined up airflow properly designed Carrier wing has just enough camber produce needed lift ti airplanes weight speed near ze incidence exact camber required will depend up weight wing area speed altitude temperatur flying height few other factors Fort nately airfoils tolerant small deviation minimum-drag section fairly consiste Carrier models Large light Profiles end spectrum small heas Class II ships other end Another factor consider drag can r duced lift smoothly drops zero ti1 cant happen rectangular wing constant airfoil section constant incidence works rather well wings change froi lifting sections root symmetrical sectior tip design wings tip syn metrical flying zero incidence di model its top speed Some people like fly close ma mum allowable height 20 ft can TI idea model flies smaller circle therefore earns greater high-speed scoreevi though actual speed same ata low height doesnt work energy consumed climbing greater height slows acceleratio extra lift required slows top speei increased lift depends upon speed model 20 ft requires 35 5 times lift model flying 5 ft typical Carrier mat el losses exceed anticipated gain froi flying shorter circle try fly height 5 ft try design m planes way too us mot comfortable flying about 10 ft heigh typical Profile would need root camber 2% typical Class II model would require root camber 3% numbers based o 166 Model Aviation Electric Flight f Controller Perfect 05 Motors 5-10 cells Has Brake2 month Lightweight 12 00money back Adjustable switching point Soidertess tenninal tor easy hookupguarantee ON/OFF Controller $2495 Power save weight 20 Size 22st3s63 Very high efficiency 006V loss Add 1100 fan skipping Cojifornia residents add 65% S163 Tao Send Check money order ComoooihIfHigh Sky Fntobaoosseetor ow3929 Kansas St #9 otheoooae7o5ijs seeSan DiegoCA 92104 Service Ace Cirrus EK Futaba Heathkit Hobbyshack JR KGL ___________________________________ K-Line KO Propo Kraft KSE Logitrol Novak Royal Tower Hobbies World Engines . 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