Radio Control Soaring Dan Pruss COMPUTER people pay attention Chuck Anderson Tullahoma TN has sent lettertoo long reprint herebut worth merely mention Pic tures Chuck models have ap peared column few times back showed couple winglet designs 1982 AMA Nationals see Model Aviation November 1982 letter Chuck Home-computer-generated airfoil plots shown full size Theres info column source price compatibility software computers description programs airfoil plots designed Commodore 64 computer will future MA article Printing can done Gemini lox Epson FX airfoil samples included letter smooth modeler could hope require Three plots being made available anyone has need Plot 1 uses quadruple-density graphics maximum accuracy somewhat slow printing does provide ultra high resolution Chord lengths range twoinchesto 15 inches andupto 15 inches thick accuracy approx 0002 Try old drawing board Plot 2 double-density high resolu tion sacrifices little accuracy speed Speed twice Plot 1 about two minutes per inch chord length However accuracy still within 0004 Plot 3 identicai Plot 1 except maximum thickness airfoil three inches Plotting speed approximately three minutes per inch reaily nice feature plot proPart flight line aero-tow contest Munich Germany L Entries top-notch scale birds /4-scale KA-lO R gets carried flight line Flying site paved runway parkIlke quality provided maintained city sport aeromodeling SIte too am winch-tow Soaring just right aerotow Front-end shot ASK-la 1 Note hole tip models nose towline attachment aero-tow No stand-off Scale spoken RI interior shot same ASK-la Note shoelaces dummy pilot Despite high-quality building Its being Nationals event picnic-like atmosphere Ref reshingl 50 Model Aviation grams allowances can made skin thickness skin thickness option selected dotted line plotted offset inside airfoil contour thickness skin feature shown reproduced figure beginning column Data files complete package Chuck furnishes include nearly 40 airfoils Among nearly Eppler Quabeck series also Bames Selig Wortmannand immor tal Clark-Y basic Airfoil Plot Program package supplied either disk tape consists four programs written BASIC Data files test pattern four airfoils included complete Airfoil Plot Program supplied disc program includes 37 airfoils Cost basic package $10 complete package $20 further formation contact Chuck Anderson 202 Inglewood Circle Tullahoma TN 37388 Back dark ages RC Soaring us just spinoff power club usually share flying site long before 10-minute maxes norm rather exception too few frequencies try LSF Level 1115-minute-duration flight some non-Glider type point ing finger air hogespecially Continued page 145 FROM THE DESIGNERS OF THE i14 RETRIEVER .. SPORT SCALE DESIGNED FOR 05 ELECTRIC POWER Three channels Bolt-on wing 4 span ls2 sq 142 oz 7 cells OS motor/reducer AND THE PROPHET TWO METER COMPETITION SAILPLANE 4 Optional wing configurations electric fuselage plans oz/sqftwing loading Designed 12 v launches S Modified 3-193 airfoil YOUR SOURCE FOR QUIET FLIGHT SUPPLIES hin DAVEY ISYSTEMS U CORPORATION ONE WOOD LANEMALVEENpA19355 215644-6772 DEALER INQUIRIES INVITED April 1985 51 Aero-towlng progress its simple system Towline 25 meters Table behind fliers permanent fixture Its use preparing models flight Nice touch $4495 x $5395 purpose can discarded resin hardens too quickly before can cleaned dope thinner acetone large quantities resin mixed hardener may begin set before can completely used Smaller amounts ounce time easily managed stopping middle cloth piece presents no problem Clean brush thinner mix fresh one-ounce batch continue After area covered resin excess can removed absorbent tissue process aids pressing cloth close contact balsa Once resin begins set up its too late using tissue new sharp razor blade cuts away excess cloth along edge can done just before resin has gelled Fumes resin can hazardous health Keep room ventilated Resin hardener methyl ethyl ketone peroxide can cause blindness Protect eyes second coat resin may neded exposed filaments glass visible surface second coat should added sparingly stretching brushful its limit Resin weight mixing cup same amount model no evaporation solvents light sanding between coats silicon carbide No 180 sandpaper will remove small high spots Avoid sanding down glass because its thickness very small point weave glass cloth remains visible filler required fill weave can popular fillers easy sand since weighty material will removed K&B Primer Ditzler No 32 Primer suitable examples can sprayed brushed Sanding first 180-grit silicon carbide paper will remove excess primer care must taken step sand down cloth final polish 320-grit silicon carbide paper will remove small scratches coarse sanding give surface smooth metal-like finish amount sanding has effect models weight because primers quite heavy compared reasonably light cloth resin underneath Panel lines rivets model will lift out ordinary class Lines produced means masking tape layer tape average depth two heavy panel lines Unthinned primer brushed along edge tape dry primer sanded down sur face feathered adjacent area Remove tape panel line appears curved lines edges fillets exam ple use vinyl electrical tape lines intersect sanding operation must done care avoid removing exist ing line No single finishing operation can realistic surface application panel lines Round-head rivets can simulated droplets Wilhold R/C-56 glue Woin Jet Age Air Force 1@ Ih I I I Jet Age Ducted Fans 5 6 units featuring blade tip seals suspension mountings Jet Age fan future Lear Jet Length 94 Width 76 Weight 18 lbs SR-71 Length 107 Width 54 Weight 22 lbs S3A ng Length 54 Width 68 Weight 12 ib I I I I ii Send $200 A5428 Bushneii COMPLETE BROCHUREI UIRiverside CA 92506 Refunded first orderMODEL AIRCRAFT CO714 687-3836 J Lines drawn pencil make location rivet rows Short intersecting lines mark location rivet certain true spacing alignment time-consuming part rivet-making job Applying droplets glue amazingly quick operation Spill small pool glue plastic metal plate Dip round toothpick pool transfer adhering drop airplane setting carefully line intersection rivet shape isnt satisfactory can wiped clean Size rivet head can controlled cutting toothpick end form larger-diameter applicator system rivets can formed rate two seconds tedious task worth effort Flush-type rivets can depicted twirling sharpened brass tube over pencil line intersections leave circular indentation Brush-painting over meticu lously-applied detail may tend spoil effect Spraying color lightly minimum buildup paint will preserve detail Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI S3018 Models Thought framework quite obscure Needs covering thats fine effect cure Lou Roberts RC Soaring/Pruss Continued page 51 channel flying field crowd ed Thirty-minute flights further reduced Power/Soaring compatibility car pools church picnics some trade shows Judging some newsletters come way again might harmony between two groupsif can stand noise unadulterated muf fled flying fields giving way highrises highways hybrid crops teamingup might means survival Surely addition new frequencies makes manageable However still might have trouble LSF Level V two-hour duration flight Sunday afternoon Last September scribe witness Soaring meet teaming-up way fly lasted two whole days because national contest Im referring aero-towing event An event like powered planes tow Sailplanes altitude re lease Although has tried USA quite successfully experimental basis sport level least two countries France Germany quite popular event Munich Germany last September event featured Scale powered aircraft Continued page 148 April 1985 145 MODEL KITS INCLUDE Complete fiberglass construction Ducted fan units Hardware Optional retracts Rossi-Picco OS engines Factory-Direct Pricing SR 71-S/S 1/12 Scale 2-80 Engines $46400 Lear Jet 1/6 Scale 280 Engines $39500 S-3A Viking 1/12 Scale 2-45 Engines $28800 towing Scale Sailpianes part latter quarter-scale class powered planes included Pitts Po lish Wilga several Super Cubs tow planes Munich Aero Club flying site provided city Although site too small Sail plane flying know because linelength requirements its nearly perfect aero-tow event Trimmed grass paved black-top runway help men tion well-equipped clubhouse designed vexy well inside rainy days because rain inter mittent two days difficult get coverage hoped Because weather Sailplanes werent set up once onetime 18 beauties pit area dog among Others still cars vans under plastic sheets mechanics nero-tow setup launch procedures simple case latter became routine 300th launch Paragon launching system 25-meter length heavy-duty monofilament line used type line common European fliers 100-lb nylon line know would serve quite well Since tow planes equipped topmounted wing simple servo-operated release mechanism mounted top wing center gravity turn also placed attach point close center drag Sailplanes designed equipped attach release towline Sailplanes nose manner unlike full-scale counter parts Launch procedures follows routine mentioned before signal between tow plane Sailplane fliers former would begin normal takeoff Because slower flying speed Sailplanejust full-scaleit would take off just before tow plane got airborne Because towline attach point Glider right nose stability during tow natural child being pulled sled climbout continued straight ahead until safe altitude reached big lazy climbing 3600 turn executed placing tow plane Sailplane over field safe enough altitude release During climb turn gradual enough practically no control inputs necessary Sailplane Release altitude 360 com pleted always high enough complete required maneuvers altitude reached Sailplane released line began its task meantime tow plane cut its power came down approach dropping towline off side landing area came back around landing towline equipped small banner few meters ahead Sailplane just make lo cating easier after dropped score sheet type Sailplane flying simple judging subjective yet meet didnt see anyone gripe Mandatory maneuvers scored takeoff 10-second straight level flight after tow release followed figure eight After three completed flier choice doing three six listed maneuvers three done sequence order earn points six listed procedure turn slip three-turn spiral using least 45 degrees bank loop stall figure flier chosen before flight final maneuver scored land ing Besides quality landing itself bonus scored according third runway touch-down occurred above maneuvers seem too tame Worldbeater 12 remember event Scale birds ones saw museum quality maneuvers ac complished way down since lot type flying occurs days thermals another country weekend saw kind conditions So power-flier buddies 148 Model Aviation InvIted join lIt National Soaring Society OFFICIAL SOARING SPECIAL INTEREST GROUF YEARLY NATIONAL TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS FROGRAM EXCELLENT SI-MONTHLY NEWSLETTER NSS CONTRIBUTES SUBSTANTIAL AMOUNTS TO EACH F3B SOARING TEAM NES IS RESPONSIBLE FOR THE ORGANIZATION AND OVERSEEING OF AMA NATE INCLUDING AWARDS BANQUET YEARLY DUES ARE S12OG SPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL Ii DISTRICTS 4 C hew Asat 1v K Adjet HEAD LON tenet Cnaietr Ami44 SI Jaik LE cYL $3795 1 CYL $4495 HEAD LOCK On-Board FLThITNNIE ThAD S[CJ LANDNIS Fits 0S 4 stroke & standard glow plugs Canpiete IlfloAl If%JC lhrk HI GP connector external start external start/charge jack charger w/HEAD IIXIC connector quality 12 Nicad w/nrjunt Ccvnpletely assenbied ready imunt nothing else boy l nade RC Soaring/Pruss Continued page 145 HOlDV COLLECT PIENTPOL SCOUT PAN E CULATE Intomaron Contacts JOHN R VOGEL 906 ORCHARD PARk OR CIBSONIA PA 15044 want try something different exciting both ends towline try aero towing dont have start off exotic mega-buck Scale bird either Dust off old floater rig simple tow release nose have tow bird want workhorse rather some sleek Pattern ship gents Munich using ships 60 90 cu displacements fifth- quarter-scale ships really want some fin challenge launching partner spotlanding contest Hes got make dead stick after might get old flying field back youre almost sure win free lunch him Back lathe January column mention made some pretty fine publications available wrong price SFVSF TechnicalAnthology goes $1250 $10 stated Have sent some money support USA F3B team Good lift Dan Pruss 131 E Pennington Ln Plainfleld IL 60544 RC Electrics/Kopski Continued page 53 quite close agreement published AFT lends lot credibility confidence own feelings about whats presented highly-detailed description Unger 18 can found December 1984 Ampere Flyer electrical data measured digital volt amp meters rpm read analog tach estimated accuracies 2% respec tively two electrical parameters accuracy plus resolution tach estimated ase absolute accuracies important relative results motors run over load power input ranges would personally use own planes As noted times before conservative approach Electric want motors batteries whatever run well last long help assure dont push anything Thus some motors may advertised capable running higher power levels generally hold operating conditions below maximum Also practical reasons usually dont bother testing much beyond 20 volts because Id rather fly cellsits too much trou ble charge such pack same sense usually wont test much beyond 20 amps because Id rather have some reasonable flight duration Besides such heavy currents tend reduce system effi ciencies rapidly due PR losses studying table youll notice motors tested same rpm limits same props general ly because either operating voltage current reached upper limit Signal Guard blocks random noise off-frequency signals can cause loss control air land RO models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit cared test Thus some motor large prop would tend draw high current relatively low applied voltage inverse might true another motor Among other things could due nature armature winding design some intended application motor See February 1985 MA Thus other parameter might limit first course condi tions some in-between prop sizes would permit both voltage current top out about same time thus producing highest possible power levels listed Finally some missing obviously desirable test points result oversight during hectic testing Sorry want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal GuardTM major credit card send $150 check money order PO Box 30179 Portland OR 97230 Oregon call collect 503-257-0912 So does use informa tion select motor impor tant consideration particular appli cation example youre primarily interested long lazy sport flying choose motor/prop produces necessary power level relatively higher voltage lower currenta given bat tery will last longest other hand prefer highpower bursts short duration some competitive reason go other way around Select motor/prop uses fewest smallest cells lightest-weight pack will still meet current de mand desired short motor run time theres intermediate approach should appeal hotter sport April 1985 149 90 day warranty cted dealerships available
Edition: Model Aviation - 1985/04
Page Numbers: 50, 51, 145, 148, 149
Radio Control Soaring Dan Pruss COMPUTER people pay attention Chuck Anderson Tullahoma TN has sent lettertoo long reprint herebut worth merely mention Pic tures Chuck models have ap peared column few times back showed couple winglet designs 1982 AMA Nationals see Model Aviation November 1982 letter Chuck Home-computer-generated airfoil plots shown full size Theres info column source price compatibility software computers description programs airfoil plots designed Commodore 64 computer will future MA article Printing can done Gemini lox Epson FX airfoil samples included letter smooth modeler could hope require Three plots being made available anyone has need Plot 1 uses quadruple-density graphics maximum accuracy somewhat slow printing does provide ultra high resolution Chord lengths range twoinchesto 15 inches andupto 15 inches thick accuracy approx 0002 Try old drawing board Plot 2 double-density high resolu tion sacrifices little accuracy speed Speed twice Plot 1 about two minutes per inch chord length However accuracy still within 0004 Plot 3 identicai Plot 1 except maximum thickness airfoil three inches Plotting speed approximately three minutes per inch reaily nice feature plot proPart flight line aero-tow contest Munich Germany L Entries top-notch scale birds /4-scale KA-lO R gets carried flight line Flying site paved runway parkIlke quality provided maintained city sport aeromodeling SIte too am winch-tow Soaring just right aerotow Front-end shot ASK-la 1 Note hole tip models nose towline attachment aero-tow No stand-off Scale spoken RI interior shot same ASK-la Note shoelaces dummy pilot Despite high-quality building Its being Nationals event picnic-like atmosphere Ref reshingl 50 Model Aviation grams allowances can made skin thickness skin thickness option selected dotted line plotted offset inside airfoil contour thickness skin feature shown reproduced figure beginning column Data files complete package Chuck furnishes include nearly 40 airfoils Among nearly Eppler Quabeck series also Bames Selig Wortmannand immor tal Clark-Y basic Airfoil Plot Program package supplied either disk tape consists four programs written BASIC Data files test pattern four airfoils included complete Airfoil Plot Program supplied disc program includes 37 airfoils Cost basic package $10 complete package $20 further formation contact Chuck Anderson 202 Inglewood Circle Tullahoma TN 37388 Back dark ages RC Soaring us just spinoff power club usually share flying site long before 10-minute maxes norm rather exception too few frequencies try LSF Level 1115-minute-duration flight some non-Glider type point ing finger air hogespecially Continued page 145 FROM THE DESIGNERS OF THE i14 RETRIEVER .. SPORT SCALE DESIGNED FOR 05 ELECTRIC POWER Three channels Bolt-on wing 4 span ls2 sq 142 oz 7 cells OS motor/reducer AND THE PROPHET TWO METER COMPETITION SAILPLANE 4 Optional wing configurations electric fuselage plans oz/sqftwing loading Designed 12 v launches S Modified 3-193 airfoil YOUR SOURCE FOR QUIET FLIGHT SUPPLIES hin DAVEY ISYSTEMS U CORPORATION ONE WOOD LANEMALVEENpA19355 215644-6772 DEALER INQUIRIES INVITED April 1985 51 Aero-towlng progress its simple system Towline 25 meters Table behind fliers permanent fixture Its use preparing models flight Nice touch $4495 x $5395 purpose can discarded resin hardens too quickly before can cleaned dope thinner acetone large quantities resin mixed hardener may begin set before can completely used Smaller amounts ounce time easily managed stopping middle cloth piece presents no problem Clean brush thinner mix fresh one-ounce batch continue After area covered resin excess can removed absorbent tissue process aids pressing cloth close contact balsa Once resin begins set up its too late using tissue new sharp razor blade cuts away excess cloth along edge can done just before resin has gelled Fumes resin can hazardous health Keep room ventilated Resin hardener methyl ethyl ketone peroxide can cause blindness Protect eyes second coat resin may neded exposed filaments glass visible surface second coat should added sparingly stretching brushful its limit Resin weight mixing cup same amount model no evaporation solvents light sanding between coats silicon carbide No 180 sandpaper will remove small high spots Avoid sanding down glass because its thickness very small point weave glass cloth remains visible filler required fill weave can popular fillers easy sand since weighty material will removed K&B Primer Ditzler No 32 Primer suitable examples can sprayed brushed Sanding first 180-grit silicon carbide paper will remove excess primer care must taken step sand down cloth final polish 320-grit silicon carbide paper will remove small scratches coarse sanding give surface smooth metal-like finish amount sanding has effect models weight because primers quite heavy compared reasonably light cloth resin underneath Panel lines rivets model will lift out ordinary class Lines produced means masking tape layer tape average depth two heavy panel lines Unthinned primer brushed along edge tape dry primer sanded down sur face feathered adjacent area Remove tape panel line appears curved lines edges fillets exam ple use vinyl electrical tape lines intersect sanding operation must done care avoid removing exist ing line No single finishing operation can realistic surface application panel lines Round-head rivets can simulated droplets Wilhold R/C-56 glue Woin Jet Age Air Force 1@ Ih I I I Jet Age Ducted Fans 5 6 units featuring blade tip seals suspension mountings Jet Age fan future Lear Jet Length 94 Width 76 Weight 18 lbs SR-71 Length 107 Width 54 Weight 22 lbs S3A ng Length 54 Width 68 Weight 12 ib I I I I ii Send $200 A5428 Bushneii COMPLETE BROCHUREI UIRiverside CA 92506 Refunded first orderMODEL AIRCRAFT CO714 687-3836 J Lines drawn pencil make location rivet rows Short intersecting lines mark location rivet certain true spacing alignment time-consuming part rivet-making job Applying droplets glue amazingly quick operation Spill small pool glue plastic metal plate Dip round toothpick pool transfer adhering drop airplane setting carefully line intersection rivet shape isnt satisfactory can wiped clean Size rivet head can controlled cutting toothpick end form larger-diameter applicator system rivets can formed rate two seconds tedious task worth effort Flush-type rivets can depicted twirling sharpened brass tube over pencil line intersections leave circular indentation Brush-painting over meticu lously-applied detail may tend spoil effect Spraying color lightly minimum buildup paint will preserve detail Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI S3018 Models Thought framework quite obscure Needs covering thats fine effect cure Lou Roberts RC Soaring/Pruss Continued page 51 channel flying field crowd ed Thirty-minute flights further reduced Power/Soaring compatibility car pools church picnics some trade shows Judging some newsletters come way again might harmony between two groupsif can stand noise unadulterated muf fled flying fields giving way highrises highways hybrid crops teamingup might means survival Surely addition new frequencies makes manageable However still might have trouble LSF Level V two-hour duration flight Sunday afternoon Last September scribe witness Soaring meet teaming-up way fly lasted two whole days because national contest Im referring aero-towing event An event like powered planes tow Sailplanes altitude re lease Although has tried USA quite successfully experimental basis sport level least two countries France Germany quite popular event Munich Germany last September event featured Scale powered aircraft Continued page 148 April 1985 145 MODEL KITS INCLUDE Complete fiberglass construction Ducted fan units Hardware Optional retracts Rossi-Picco OS engines Factory-Direct Pricing SR 71-S/S 1/12 Scale 2-80 Engines $46400 Lear Jet 1/6 Scale 280 Engines $39500 S-3A Viking 1/12 Scale 2-45 Engines $28800 towing Scale Sailpianes part latter quarter-scale class powered planes included Pitts Po lish Wilga several Super Cubs tow planes Munich Aero Club flying site provided city Although site too small Sail plane flying know because linelength requirements its nearly perfect aero-tow event Trimmed grass paved black-top runway help men tion well-equipped clubhouse designed vexy well inside rainy days because rain inter mittent two days difficult get coverage hoped Because weather Sailplanes werent set up once onetime 18 beauties pit area dog among Others still cars vans under plastic sheets mechanics nero-tow setup launch procedures simple case latter became routine 300th launch Paragon launching system 25-meter length heavy-duty monofilament line used type line common European fliers 100-lb nylon line know would serve quite well Since tow planes equipped topmounted wing simple servo-operated release mechanism mounted top wing center gravity turn also placed attach point close center drag Sailplanes designed equipped attach release towline Sailplanes nose manner unlike full-scale counter parts Launch procedures follows routine mentioned before signal between tow plane Sailplane fliers former would begin normal takeoff Because slower flying speed Sailplanejust full-scaleit would take off just before tow plane got airborne Because towline attach point Glider right nose stability during tow natural child being pulled sled climbout continued straight ahead until safe altitude reached big lazy climbing 3600 turn executed placing tow plane Sailplane over field safe enough altitude release During climb turn gradual enough practically no control inputs necessary Sailplane Release altitude 360 com pleted always high enough complete required maneuvers altitude reached Sailplane released line began its task meantime tow plane cut its power came down approach dropping towline off side landing area came back around landing towline equipped small banner few meters ahead Sailplane just make lo cating easier after dropped score sheet type Sailplane flying simple judging subjective yet meet didnt see anyone gripe Mandatory maneuvers scored takeoff 10-second straight level flight after tow release followed figure eight After three completed flier choice doing three six listed maneuvers three done sequence order earn points six listed procedure turn slip three-turn spiral using least 45 degrees bank loop stall figure flier chosen before flight final maneuver scored land ing Besides quality landing itself bonus scored according third runway touch-down occurred above maneuvers seem too tame Worldbeater 12 remember event Scale birds ones saw museum quality maneuvers ac complished way down since lot type flying occurs days thermals another country weekend saw kind conditions So power-flier buddies 148 Model Aviation InvIted join lIt National Soaring Society OFFICIAL SOARING SPECIAL INTEREST GROUF YEARLY NATIONAL TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS FROGRAM EXCELLENT SI-MONTHLY NEWSLETTER NSS CONTRIBUTES SUBSTANTIAL AMOUNTS TO EACH F3B SOARING TEAM NES IS RESPONSIBLE FOR THE ORGANIZATION AND OVERSEEING OF AMA NATE INCLUDING AWARDS BANQUET YEARLY DUES ARE S12OG SPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL Ii DISTRICTS 4 C hew Asat 1v K Adjet HEAD LON tenet Cnaietr Ami44 SI Jaik LE cYL $3795 1 CYL $4495 HEAD LOCK On-Board FLThITNNIE ThAD S[CJ LANDNIS Fits 0S 4 stroke & standard glow plugs Canpiete IlfloAl If%JC lhrk HI GP connector external start external start/charge jack charger w/HEAD IIXIC connector quality 12 Nicad w/nrjunt Ccvnpletely assenbied ready imunt nothing else boy l nade RC Soaring/Pruss Continued page 145 HOlDV COLLECT PIENTPOL SCOUT PAN E CULATE Intomaron Contacts JOHN R VOGEL 906 ORCHARD PARk OR CIBSONIA PA 15044 want try something different exciting both ends towline try aero towing dont have start off exotic mega-buck Scale bird either Dust off old floater rig simple tow release nose have tow bird want workhorse rather some sleek Pattern ship gents Munich using ships 60 90 cu displacements fifth- quarter-scale ships really want some fin challenge launching partner spotlanding contest Hes got make dead stick after might get old flying field back youre almost sure win free lunch him Back lathe January column mention made some pretty fine publications available wrong price SFVSF TechnicalAnthology goes $1250 $10 stated Have sent some money support USA F3B team Good lift Dan Pruss 131 E Pennington Ln Plainfleld IL 60544 RC Electrics/Kopski Continued page 53 quite close agreement published AFT lends lot credibility confidence own feelings about whats presented highly-detailed description Unger 18 can found December 1984 Ampere Flyer electrical data measured digital volt amp meters rpm read analog tach estimated accuracies 2% respec tively two electrical parameters accuracy plus resolution tach estimated ase absolute accuracies important relative results motors run over load power input ranges would personally use own planes As noted times before conservative approach Electric want motors batteries whatever run well last long help assure dont push anything Thus some motors may advertised capable running higher power levels generally hold operating conditions below maximum Also practical reasons usually dont bother testing much beyond 20 volts because Id rather fly cellsits too much trou ble charge such pack same sense usually wont test much beyond 20 amps because Id rather have some reasonable flight duration Besides such heavy currents tend reduce system effi ciencies rapidly due PR losses studying table youll notice motors tested same rpm limits same props general ly because either operating voltage current reached upper limit Signal Guard blocks random noise off-frequency signals can cause loss control air land RO models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit cared test Thus some motor large prop would tend draw high current relatively low applied voltage inverse might true another motor Among other things could due nature armature winding design some intended application motor See February 1985 MA Thus other parameter might limit first course condi tions some in-between prop sizes would permit both voltage current top out about same time thus producing highest possible power levels listed Finally some missing obviously desirable test points result oversight during hectic testing Sorry want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal GuardTM major credit card send $150 check money order PO Box 30179 Portland OR 97230 Oregon call collect 503-257-0912 So does use informa tion select motor impor tant consideration particular appli cation example youre primarily interested long lazy sport flying choose motor/prop produces necessary power level relatively higher voltage lower currenta given bat tery will last longest other hand prefer highpower bursts short duration some competitive reason go other way around Select motor/prop uses fewest smallest cells lightest-weight pack will still meet current de mand desired short motor run time theres intermediate approach should appeal hotter sport April 1985 149 90 day warranty cted dealerships available
Edition: Model Aviation - 1985/04
Page Numbers: 50, 51, 145, 148, 149
Radio Control Soaring Dan Pruss COMPUTER people pay attention Chuck Anderson Tullahoma TN has sent lettertoo long reprint herebut worth merely mention Pic tures Chuck models have ap peared column few times back showed couple winglet designs 1982 AMA Nationals see Model Aviation November 1982 letter Chuck Home-computer-generated airfoil plots shown full size Theres info column source price compatibility software computers description programs airfoil plots designed Commodore 64 computer will future MA article Printing can done Gemini lox Epson FX airfoil samples included letter smooth modeler could hope require Three plots being made available anyone has need Plot 1 uses quadruple-density graphics maximum accuracy somewhat slow printing does provide ultra high resolution Chord lengths range twoinchesto 15 inches andupto 15 inches thick accuracy approx 0002 Try old drawing board Plot 2 double-density high resolu tion sacrifices little accuracy speed Speed twice Plot 1 about two minutes per inch chord length However accuracy still within 0004 Plot 3 identicai Plot 1 except maximum thickness airfoil three inches Plotting speed approximately three minutes per inch reaily nice feature plot proPart flight line aero-tow contest Munich Germany L Entries top-notch scale birds /4-scale KA-lO R gets carried flight line Flying site paved runway parkIlke quality provided maintained city sport aeromodeling SIte too am winch-tow Soaring just right aerotow Front-end shot ASK-la 1 Note hole tip models nose towline attachment aero-tow No stand-off Scale spoken RI interior shot same ASK-la Note shoelaces dummy pilot Despite high-quality building Its being Nationals event picnic-like atmosphere Ref reshingl 50 Model Aviation grams allowances can made skin thickness skin thickness option selected dotted line plotted offset inside airfoil contour thickness skin feature shown reproduced figure beginning column Data files complete package Chuck furnishes include nearly 40 airfoils Among nearly Eppler Quabeck series also Bames Selig Wortmannand immor tal Clark-Y basic Airfoil Plot Program package supplied either disk tape consists four programs written BASIC Data files test pattern four airfoils included complete Airfoil Plot Program supplied disc program includes 37 airfoils Cost basic package $10 complete package $20 further formation contact Chuck Anderson 202 Inglewood Circle Tullahoma TN 37388 Back dark ages RC Soaring us just spinoff power club usually share flying site long before 10-minute maxes norm rather exception too few frequencies try LSF Level 1115-minute-duration flight some non-Glider type point ing finger air hogespecially Continued page 145 FROM THE DESIGNERS OF THE i14 RETRIEVER .. SPORT SCALE DESIGNED FOR 05 ELECTRIC POWER Three channels Bolt-on wing 4 span ls2 sq 142 oz 7 cells OS motor/reducer AND THE PROPHET TWO METER COMPETITION SAILPLANE 4 Optional wing configurations electric fuselage plans oz/sqftwing loading Designed 12 v launches S Modified 3-193 airfoil YOUR SOURCE FOR QUIET FLIGHT SUPPLIES hin DAVEY ISYSTEMS U CORPORATION ONE WOOD LANEMALVEENpA19355 215644-6772 DEALER INQUIRIES INVITED April 1985 51 Aero-towlng progress its simple system Towline 25 meters Table behind fliers permanent fixture Its use preparing models flight Nice touch $4495 x $5395 purpose can discarded resin hardens too quickly before can cleaned dope thinner acetone large quantities resin mixed hardener may begin set before can completely used Smaller amounts ounce time easily managed stopping middle cloth piece presents no problem Clean brush thinner mix fresh one-ounce batch continue After area covered resin excess can removed absorbent tissue process aids pressing cloth close contact balsa Once resin begins set up its too late using tissue new sharp razor blade cuts away excess cloth along edge can done just before resin has gelled Fumes resin can hazardous health Keep room ventilated Resin hardener methyl ethyl ketone peroxide can cause blindness Protect eyes second coat resin may neded exposed filaments glass visible surface second coat should added sparingly stretching brushful its limit Resin weight mixing cup same amount model no evaporation solvents light sanding between coats silicon carbide No 180 sandpaper will remove small high spots Avoid sanding down glass because its thickness very small point weave glass cloth remains visible filler required fill weave can popular fillers easy sand since weighty material will removed K&B Primer Ditzler No 32 Primer suitable examples can sprayed brushed Sanding first 180-grit silicon carbide paper will remove excess primer care must taken step sand down cloth final polish 320-grit silicon carbide paper will remove small scratches coarse sanding give surface smooth metal-like finish amount sanding has effect models weight because primers quite heavy compared reasonably light cloth resin underneath Panel lines rivets model will lift out ordinary class Lines produced means masking tape layer tape average depth two heavy panel lines Unthinned primer brushed along edge tape dry primer sanded down sur face feathered adjacent area Remove tape panel line appears curved lines edges fillets exam ple use vinyl electrical tape lines intersect sanding operation must done care avoid removing exist ing line No single finishing operation can realistic surface application panel lines Round-head rivets can simulated droplets Wilhold R/C-56 glue Woin Jet Age Air Force 1@ Ih I I I Jet Age Ducted Fans 5 6 units featuring blade tip seals suspension mountings Jet Age fan future Lear Jet Length 94 Width 76 Weight 18 lbs SR-71 Length 107 Width 54 Weight 22 lbs S3A ng Length 54 Width 68 Weight 12 ib I I I I ii Send $200 A5428 Bushneii COMPLETE BROCHUREI UIRiverside CA 92506 Refunded first orderMODEL AIRCRAFT CO714 687-3836 J Lines drawn pencil make location rivet rows Short intersecting lines mark location rivet certain true spacing alignment time-consuming part rivet-making job Applying droplets glue amazingly quick operation Spill small pool glue plastic metal plate Dip round toothpick pool transfer adhering drop airplane setting carefully line intersection rivet shape isnt satisfactory can wiped clean Size rivet head can controlled cutting toothpick end form larger-diameter applicator system rivets can formed rate two seconds tedious task worth effort Flush-type rivets can depicted twirling sharpened brass tube over pencil line intersections leave circular indentation Brush-painting over meticu lously-applied detail may tend spoil effect Spraying color lightly minimum buildup paint will preserve detail Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI S3018 Models Thought framework quite obscure Needs covering thats fine effect cure Lou Roberts RC Soaring/Pruss Continued page 51 channel flying field crowd ed Thirty-minute flights further reduced Power/Soaring compatibility car pools church picnics some trade shows Judging some newsletters come way again might harmony between two groupsif can stand noise unadulterated muf fled flying fields giving way highrises highways hybrid crops teamingup might means survival Surely addition new frequencies makes manageable However still might have trouble LSF Level V two-hour duration flight Sunday afternoon Last September scribe witness Soaring meet teaming-up way fly lasted two whole days because national contest Im referring aero-towing event An event like powered planes tow Sailplanes altitude re lease Although has tried USA quite successfully experimental basis sport level least two countries France Germany quite popular event Munich Germany last September event featured Scale powered aircraft Continued page 148 April 1985 145 MODEL KITS INCLUDE Complete fiberglass construction Ducted fan units Hardware Optional retracts Rossi-Picco OS engines Factory-Direct Pricing SR 71-S/S 1/12 Scale 2-80 Engines $46400 Lear Jet 1/6 Scale 280 Engines $39500 S-3A Viking 1/12 Scale 2-45 Engines $28800 towing Scale Sailpianes part latter quarter-scale class powered planes included Pitts Po lish Wilga several Super Cubs tow planes Munich Aero Club flying site provided city Although site too small Sail plane flying know because linelength requirements its nearly perfect aero-tow event Trimmed grass paved black-top runway help men tion well-equipped clubhouse designed vexy well inside rainy days because rain inter mittent two days difficult get coverage hoped Because weather Sailplanes werent set up once onetime 18 beauties pit area dog among Others still cars vans under plastic sheets mechanics nero-tow setup launch procedures simple case latter became routine 300th launch Paragon launching system 25-meter length heavy-duty monofilament line used type line common European fliers 100-lb nylon line know would serve quite well Since tow planes equipped topmounted wing simple servo-operated release mechanism mounted top wing center gravity turn also placed attach point close center drag Sailplanes designed equipped attach release towline Sailplanes nose manner unlike full-scale counter parts Launch procedures follows routine mentioned before signal between tow plane Sailplane fliers former would begin normal takeoff Because slower flying speed Sailplanejust full-scaleit would take off just before tow plane got airborne Because towline attach point Glider right nose stability during tow natural child being pulled sled climbout continued straight ahead until safe altitude reached big lazy climbing 3600 turn executed placing tow plane Sailplane over field safe enough altitude release During climb turn gradual enough practically no control inputs necessary Sailplane Release altitude 360 com pleted always high enough complete required maneuvers altitude reached Sailplane released line began its task meantime tow plane cut its power came down approach dropping towline off side landing area came back around landing towline equipped small banner few meters ahead Sailplane just make lo cating easier after dropped score sheet type Sailplane flying simple judging subjective yet meet didnt see anyone gripe Mandatory maneuvers scored takeoff 10-second straight level flight after tow release followed figure eight After three completed flier choice doing three six listed maneuvers three done sequence order earn points six listed procedure turn slip three-turn spiral using least 45 degrees bank loop stall figure flier chosen before flight final maneuver scored land ing Besides quality landing itself bonus scored according third runway touch-down occurred above maneuvers seem too tame Worldbeater 12 remember event Scale birds ones saw museum quality maneuvers ac complished way down since lot type flying occurs days thermals another country weekend saw kind conditions So power-flier buddies 148 Model Aviation InvIted join lIt National Soaring Society OFFICIAL SOARING SPECIAL INTEREST GROUF YEARLY NATIONAL TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS FROGRAM EXCELLENT SI-MONTHLY NEWSLETTER NSS CONTRIBUTES SUBSTANTIAL AMOUNTS TO EACH F3B SOARING TEAM NES IS RESPONSIBLE FOR THE ORGANIZATION AND OVERSEEING OF AMA NATE INCLUDING AWARDS BANQUET YEARLY DUES ARE S12OG SPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL Ii DISTRICTS 4 C hew Asat 1v K Adjet HEAD LON tenet Cnaietr Ami44 SI Jaik LE cYL $3795 1 CYL $4495 HEAD LOCK On-Board FLThITNNIE ThAD S[CJ LANDNIS Fits 0S 4 stroke & standard glow plugs Canpiete IlfloAl If%JC lhrk HI GP connector external start external start/charge jack charger w/HEAD IIXIC connector quality 12 Nicad w/nrjunt Ccvnpletely assenbied ready imunt nothing else boy l nade RC Soaring/Pruss Continued page 145 HOlDV COLLECT PIENTPOL SCOUT PAN E CULATE Intomaron Contacts JOHN R VOGEL 906 ORCHARD PARk OR CIBSONIA PA 15044 want try something different exciting both ends towline try aero towing dont have start off exotic mega-buck Scale bird either Dust off old floater rig simple tow release nose have tow bird want workhorse rather some sleek Pattern ship gents Munich using ships 60 90 cu displacements fifth- quarter-scale ships really want some fin challenge launching partner spotlanding contest Hes got make dead stick after might get old flying field back youre almost sure win free lunch him Back lathe January column mention made some pretty fine publications available wrong price SFVSF TechnicalAnthology goes $1250 $10 stated Have sent some money support USA F3B team Good lift Dan Pruss 131 E Pennington Ln Plainfleld IL 60544 RC Electrics/Kopski Continued page 53 quite close agreement published AFT lends lot credibility confidence own feelings about whats presented highly-detailed description Unger 18 can found December 1984 Ampere Flyer electrical data measured digital volt amp meters rpm read analog tach estimated accuracies 2% respec tively two electrical parameters accuracy plus resolution tach estimated ase absolute accuracies important relative results motors run over load power input ranges would personally use own planes As noted times before conservative approach Electric want motors batteries whatever run well last long help assure dont push anything Thus some motors may advertised capable running higher power levels generally hold operating conditions below maximum Also practical reasons usually dont bother testing much beyond 20 volts because Id rather fly cellsits too much trou ble charge such pack same sense usually wont test much beyond 20 amps because Id rather have some reasonable flight duration Besides such heavy currents tend reduce system effi ciencies rapidly due PR losses studying table youll notice motors tested same rpm limits same props general ly because either operating voltage current reached upper limit Signal Guard blocks random noise off-frequency signals can cause loss control air land RO models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit cared test Thus some motor large prop would tend draw high current relatively low applied voltage inverse might true another motor Among other things could due nature armature winding design some intended application motor See February 1985 MA Thus other parameter might limit first course condi tions some in-between prop sizes would permit both voltage current top out about same time thus producing highest possible power levels listed Finally some missing obviously desirable test points result oversight during hectic testing Sorry want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal GuardTM major credit card send $150 check money order PO Box 30179 Portland OR 97230 Oregon call collect 503-257-0912 So does use informa tion select motor impor tant consideration particular appli cation example youre primarily interested long lazy sport flying choose motor/prop produces necessary power level relatively higher voltage lower currenta given bat tery will last longest other hand prefer highpower bursts short duration some competitive reason go other way around Select motor/prop uses fewest smallest cells lightest-weight pack will still meet current de mand desired short motor run time theres intermediate approach should appeal hotter sport April 1985 149 90 day warranty cted dealerships available
Edition: Model Aviation - 1985/04
Page Numbers: 50, 51, 145, 148, 149
Radio Control Soaring Dan Pruss COMPUTER people pay attention Chuck Anderson Tullahoma TN has sent lettertoo long reprint herebut worth merely mention Pic tures Chuck models have ap peared column few times back showed couple winglet designs 1982 AMA Nationals see Model Aviation November 1982 letter Chuck Home-computer-generated airfoil plots shown full size Theres info column source price compatibility software computers description programs airfoil plots designed Commodore 64 computer will future MA article Printing can done Gemini lox Epson FX airfoil samples included letter smooth modeler could hope require Three plots being made available anyone has need Plot 1 uses quadruple-density graphics maximum accuracy somewhat slow printing does provide ultra high resolution Chord lengths range twoinchesto 15 inches andupto 15 inches thick accuracy approx 0002 Try old drawing board Plot 2 double-density high resolu tion sacrifices little accuracy speed Speed twice Plot 1 about two minutes per inch chord length However accuracy still within 0004 Plot 3 identicai Plot 1 except maximum thickness airfoil three inches Plotting speed approximately three minutes per inch reaily nice feature plot proPart flight line aero-tow contest Munich Germany L Entries top-notch scale birds /4-scale KA-lO R gets carried flight line Flying site paved runway parkIlke quality provided maintained city sport aeromodeling SIte too am winch-tow Soaring just right aerotow Front-end shot ASK-la 1 Note hole tip models nose towline attachment aero-tow No stand-off Scale spoken RI interior shot same ASK-la Note shoelaces dummy pilot Despite high-quality building Its being Nationals event picnic-like atmosphere Ref reshingl 50 Model Aviation grams allowances can made skin thickness skin thickness option selected dotted line plotted offset inside airfoil contour thickness skin feature shown reproduced figure beginning column Data files complete package Chuck furnishes include nearly 40 airfoils Among nearly Eppler Quabeck series also Bames Selig Wortmannand immor tal Clark-Y basic Airfoil Plot Program package supplied either disk tape consists four programs written BASIC Data files test pattern four airfoils included complete Airfoil Plot Program supplied disc program includes 37 airfoils Cost basic package $10 complete package $20 further formation contact Chuck Anderson 202 Inglewood Circle Tullahoma TN 37388 Back dark ages RC Soaring us just spinoff power club usually share flying site long before 10-minute maxes norm rather exception too few frequencies try LSF Level 1115-minute-duration flight some non-Glider type point ing finger air hogespecially Continued page 145 FROM THE DESIGNERS OF THE i14 RETRIEVER .. SPORT SCALE DESIGNED FOR 05 ELECTRIC POWER Three channels Bolt-on wing 4 span ls2 sq 142 oz 7 cells OS motor/reducer AND THE PROPHET TWO METER COMPETITION SAILPLANE 4 Optional wing configurations electric fuselage plans oz/sqftwing loading Designed 12 v launches S Modified 3-193 airfoil YOUR SOURCE FOR QUIET FLIGHT SUPPLIES hin DAVEY ISYSTEMS U CORPORATION ONE WOOD LANEMALVEENpA19355 215644-6772 DEALER INQUIRIES INVITED April 1985 51 Aero-towlng progress its simple system Towline 25 meters Table behind fliers permanent fixture Its use preparing models flight Nice touch $4495 x $5395 purpose can discarded resin hardens too quickly before can cleaned dope thinner acetone large quantities resin mixed hardener may begin set before can completely used Smaller amounts ounce time easily managed stopping middle cloth piece presents no problem Clean brush thinner mix fresh one-ounce batch continue After area covered resin excess can removed absorbent tissue process aids pressing cloth close contact balsa Once resin begins set up its too late using tissue new sharp razor blade cuts away excess cloth along edge can done just before resin has gelled Fumes resin can hazardous health Keep room ventilated Resin hardener methyl ethyl ketone peroxide can cause blindness Protect eyes second coat resin may neded exposed filaments glass visible surface second coat should added sparingly stretching brushful its limit Resin weight mixing cup same amount model no evaporation solvents light sanding between coats silicon carbide No 180 sandpaper will remove small high spots Avoid sanding down glass because its thickness very small point weave glass cloth remains visible filler required fill weave can popular fillers easy sand since weighty material will removed K&B Primer Ditzler No 32 Primer suitable examples can sprayed brushed Sanding first 180-grit silicon carbide paper will remove excess primer care must taken step sand down cloth final polish 320-grit silicon carbide paper will remove small scratches coarse sanding give surface smooth metal-like finish amount sanding has effect models weight because primers quite heavy compared reasonably light cloth resin underneath Panel lines rivets model will lift out ordinary class Lines produced means masking tape layer tape average depth two heavy panel lines Unthinned primer brushed along edge tape dry primer sanded down sur face feathered adjacent area Remove tape panel line appears curved lines edges fillets exam ple use vinyl electrical tape lines intersect sanding operation must done care avoid removing exist ing line No single finishing operation can realistic surface application panel lines Round-head rivets can simulated droplets Wilhold R/C-56 glue Woin Jet Age Air Force 1@ Ih I I I Jet Age Ducted Fans 5 6 units featuring blade tip seals suspension mountings Jet Age fan future Lear Jet Length 94 Width 76 Weight 18 lbs SR-71 Length 107 Width 54 Weight 22 lbs S3A ng Length 54 Width 68 Weight 12 ib I I I I ii Send $200 A5428 Bushneii COMPLETE BROCHUREI UIRiverside CA 92506 Refunded first orderMODEL AIRCRAFT CO714 687-3836 J Lines drawn pencil make location rivet rows Short intersecting lines mark location rivet certain true spacing alignment time-consuming part rivet-making job Applying droplets glue amazingly quick operation Spill small pool glue plastic metal plate Dip round toothpick pool transfer adhering drop airplane setting carefully line intersection rivet shape isnt satisfactory can wiped clean Size rivet head can controlled cutting toothpick end form larger-diameter applicator system rivets can formed rate two seconds tedious task worth effort Flush-type rivets can depicted twirling sharpened brass tube over pencil line intersections leave circular indentation Brush-painting over meticu lously-applied detail may tend spoil effect Spraying color lightly minimum buildup paint will preserve detail Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI S3018 Models Thought framework quite obscure Needs covering thats fine effect cure Lou Roberts RC Soaring/Pruss Continued page 51 channel flying field crowd ed Thirty-minute flights further reduced Power/Soaring compatibility car pools church picnics some trade shows Judging some newsletters come way again might harmony between two groupsif can stand noise unadulterated muf fled flying fields giving way highrises highways hybrid crops teamingup might means survival Surely addition new frequencies makes manageable However still might have trouble LSF Level V two-hour duration flight Sunday afternoon Last September scribe witness Soaring meet teaming-up way fly lasted two whole days because national contest Im referring aero-towing event An event like powered planes tow Sailplanes altitude re lease Although has tried USA quite successfully experimental basis sport level least two countries France Germany quite popular event Munich Germany last September event featured Scale powered aircraft Continued page 148 April 1985 145 MODEL KITS INCLUDE Complete fiberglass construction Ducted fan units Hardware Optional retracts Rossi-Picco OS engines Factory-Direct Pricing SR 71-S/S 1/12 Scale 2-80 Engines $46400 Lear Jet 1/6 Scale 280 Engines $39500 S-3A Viking 1/12 Scale 2-45 Engines $28800 towing Scale Sailpianes part latter quarter-scale class powered planes included Pitts Po lish Wilga several Super Cubs tow planes Munich Aero Club flying site provided city Although site too small Sail plane flying know because linelength requirements its nearly perfect aero-tow event Trimmed grass paved black-top runway help men tion well-equipped clubhouse designed vexy well inside rainy days because rain inter mittent two days difficult get coverage hoped Because weather Sailplanes werent set up once onetime 18 beauties pit area dog among Others still cars vans under plastic sheets mechanics nero-tow setup launch procedures simple case latter became routine 300th launch Paragon launching system 25-meter length heavy-duty monofilament line used type line common European fliers 100-lb nylon line know would serve quite well Since tow planes equipped topmounted wing simple servo-operated release mechanism mounted top wing center gravity turn also placed attach point close center drag Sailplanes designed equipped attach release towline Sailplanes nose manner unlike full-scale counter parts Launch procedures follows routine mentioned before signal between tow plane Sailplane fliers former would begin normal takeoff Because slower flying speed Sailplanejust full-scaleit would take off just before tow plane got airborne Because towline attach point Glider right nose stability during tow natural child being pulled sled climbout continued straight ahead until safe altitude reached big lazy climbing 3600 turn executed placing tow plane Sailplane over field safe enough altitude release During climb turn gradual enough practically no control inputs necessary Sailplane Release altitude 360 com pleted always high enough complete required maneuvers altitude reached Sailplane released line began its task meantime tow plane cut its power came down approach dropping towline off side landing area came back around landing towline equipped small banner few meters ahead Sailplane just make lo cating easier after dropped score sheet type Sailplane flying simple judging subjective yet meet didnt see anyone gripe Mandatory maneuvers scored takeoff 10-second straight level flight after tow release followed figure eight After three completed flier choice doing three six listed maneuvers three done sequence order earn points six listed procedure turn slip three-turn spiral using least 45 degrees bank loop stall figure flier chosen before flight final maneuver scored land ing Besides quality landing itself bonus scored according third runway touch-down occurred above maneuvers seem too tame Worldbeater 12 remember event Scale birds ones saw museum quality maneuvers ac complished way down since lot type flying occurs days thermals another country weekend saw kind conditions So power-flier buddies 148 Model Aviation InvIted join lIt National Soaring Society OFFICIAL SOARING SPECIAL INTEREST GROUF YEARLY NATIONAL TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS FROGRAM EXCELLENT SI-MONTHLY NEWSLETTER NSS CONTRIBUTES SUBSTANTIAL AMOUNTS TO EACH F3B SOARING TEAM NES IS RESPONSIBLE FOR THE ORGANIZATION AND OVERSEEING OF AMA NATE INCLUDING AWARDS BANQUET YEARLY DUES ARE S12OG SPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL Ii DISTRICTS 4 C hew Asat 1v K Adjet HEAD LON tenet Cnaietr Ami44 SI Jaik LE cYL $3795 1 CYL $4495 HEAD LOCK On-Board FLThITNNIE ThAD S[CJ LANDNIS Fits 0S 4 stroke & standard glow plugs Canpiete IlfloAl If%JC lhrk HI GP connector external start external start/charge jack charger w/HEAD IIXIC connector quality 12 Nicad w/nrjunt Ccvnpletely assenbied ready imunt nothing else boy l nade RC Soaring/Pruss Continued page 145 HOlDV COLLECT PIENTPOL SCOUT PAN E CULATE Intomaron Contacts JOHN R VOGEL 906 ORCHARD PARk OR CIBSONIA PA 15044 want try something different exciting both ends towline try aero towing dont have start off exotic mega-buck Scale bird either Dust off old floater rig simple tow release nose have tow bird want workhorse rather some sleek Pattern ship gents Munich using ships 60 90 cu displacements fifth- quarter-scale ships really want some fin challenge launching partner spotlanding contest Hes got make dead stick after might get old flying field back youre almost sure win free lunch him Back lathe January column mention made some pretty fine publications available wrong price SFVSF TechnicalAnthology goes $1250 $10 stated Have sent some money support USA F3B team Good lift Dan Pruss 131 E Pennington Ln Plainfleld IL 60544 RC Electrics/Kopski Continued page 53 quite close agreement published AFT lends lot credibility confidence own feelings about whats presented highly-detailed description Unger 18 can found December 1984 Ampere Flyer electrical data measured digital volt amp meters rpm read analog tach estimated accuracies 2% respec tively two electrical parameters accuracy plus resolution tach estimated ase absolute accuracies important relative results motors run over load power input ranges would personally use own planes As noted times before conservative approach Electric want motors batteries whatever run well last long help assure dont push anything Thus some motors may advertised capable running higher power levels generally hold operating conditions below maximum Also practical reasons usually dont bother testing much beyond 20 volts because Id rather fly cellsits too much trou ble charge such pack same sense usually wont test much beyond 20 amps because Id rather have some reasonable flight duration Besides such heavy currents tend reduce system effi ciencies rapidly due PR losses studying table youll notice motors tested same rpm limits same props general ly because either operating voltage current reached upper limit Signal Guard blocks random noise off-frequency signals can cause loss control air land RO models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit cared test Thus some motor large prop would tend draw high current relatively low applied voltage inverse might true another motor Among other things could due nature armature winding design some intended application motor See February 1985 MA Thus other parameter might limit first course condi tions some in-between prop sizes would permit both voltage current top out about same time thus producing highest possible power levels listed Finally some missing obviously desirable test points result oversight during hectic testing Sorry want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal GuardTM major credit card send $150 check money order PO Box 30179 Portland OR 97230 Oregon call collect 503-257-0912 So does use informa tion select motor impor tant consideration particular appli cation example youre primarily interested long lazy sport flying choose motor/prop produces necessary power level relatively higher voltage lower currenta given bat tery will last longest other hand prefer highpower bursts short duration some competitive reason go other way around Select motor/prop uses fewest smallest cells lightest-weight pack will still meet current de mand desired short motor run time theres intermediate approach should appeal hotter sport April 1985 149 90 day warranty cted dealerships available
Edition: Model Aviation - 1985/04
Page Numbers: 50, 51, 145, 148, 149
Radio Control Soaring Dan Pruss COMPUTER people pay attention Chuck Anderson Tullahoma TN has sent lettertoo long reprint herebut worth merely mention Pic tures Chuck models have ap peared column few times back showed couple winglet designs 1982 AMA Nationals see Model Aviation November 1982 letter Chuck Home-computer-generated airfoil plots shown full size Theres info column source price compatibility software computers description programs airfoil plots designed Commodore 64 computer will future MA article Printing can done Gemini lox Epson FX airfoil samples included letter smooth modeler could hope require Three plots being made available anyone has need Plot 1 uses quadruple-density graphics maximum accuracy somewhat slow printing does provide ultra high resolution Chord lengths range twoinchesto 15 inches andupto 15 inches thick accuracy approx 0002 Try old drawing board Plot 2 double-density high resolu tion sacrifices little accuracy speed Speed twice Plot 1 about two minutes per inch chord length However accuracy still within 0004 Plot 3 identicai Plot 1 except maximum thickness airfoil three inches Plotting speed approximately three minutes per inch reaily nice feature plot proPart flight line aero-tow contest Munich Germany L Entries top-notch scale birds /4-scale KA-lO R gets carried flight line Flying site paved runway parkIlke quality provided maintained city sport aeromodeling SIte too am winch-tow Soaring just right aerotow Front-end shot ASK-la 1 Note hole tip models nose towline attachment aero-tow No stand-off Scale spoken RI interior shot same ASK-la Note shoelaces dummy pilot Despite high-quality building Its being Nationals event picnic-like atmosphere Ref reshingl 50 Model Aviation grams allowances can made skin thickness skin thickness option selected dotted line plotted offset inside airfoil contour thickness skin feature shown reproduced figure beginning column Data files complete package Chuck furnishes include nearly 40 airfoils Among nearly Eppler Quabeck series also Bames Selig Wortmannand immor tal Clark-Y basic Airfoil Plot Program package supplied either disk tape consists four programs written BASIC Data files test pattern four airfoils included complete Airfoil Plot Program supplied disc program includes 37 airfoils Cost basic package $10 complete package $20 further formation contact Chuck Anderson 202 Inglewood Circle Tullahoma TN 37388 Back dark ages RC Soaring us just spinoff power club usually share flying site long before 10-minute maxes norm rather exception too few frequencies try LSF Level 1115-minute-duration flight some non-Glider type point ing finger air hogespecially Continued page 145 FROM THE DESIGNERS OF THE i14 RETRIEVER .. SPORT SCALE DESIGNED FOR 05 ELECTRIC POWER Three channels Bolt-on wing 4 span ls2 sq 142 oz 7 cells OS motor/reducer AND THE PROPHET TWO METER COMPETITION SAILPLANE 4 Optional wing configurations electric fuselage plans oz/sqftwing loading Designed 12 v launches S Modified 3-193 airfoil YOUR SOURCE FOR QUIET FLIGHT SUPPLIES hin DAVEY ISYSTEMS U CORPORATION ONE WOOD LANEMALVEENpA19355 215644-6772 DEALER INQUIRIES INVITED April 1985 51 Aero-towlng progress its simple system Towline 25 meters Table behind fliers permanent fixture Its use preparing models flight Nice touch $4495 x $5395 purpose can discarded resin hardens too quickly before can cleaned dope thinner acetone large quantities resin mixed hardener may begin set before can completely used Smaller amounts ounce time easily managed stopping middle cloth piece presents no problem Clean brush thinner mix fresh one-ounce batch continue After area covered resin excess can removed absorbent tissue process aids pressing cloth close contact balsa Once resin begins set up its too late using tissue new sharp razor blade cuts away excess cloth along edge can done just before resin has gelled Fumes resin can hazardous health Keep room ventilated Resin hardener methyl ethyl ketone peroxide can cause blindness Protect eyes second coat resin may neded exposed filaments glass visible surface second coat should added sparingly stretching brushful its limit Resin weight mixing cup same amount model no evaporation solvents light sanding between coats silicon carbide No 180 sandpaper will remove small high spots Avoid sanding down glass because its thickness very small point weave glass cloth remains visible filler required fill weave can popular fillers easy sand since weighty material will removed K&B Primer Ditzler No 32 Primer suitable examples can sprayed brushed Sanding first 180-grit silicon carbide paper will remove excess primer care must taken step sand down cloth final polish 320-grit silicon carbide paper will remove small scratches coarse sanding give surface smooth metal-like finish amount sanding has effect models weight because primers quite heavy compared reasonably light cloth resin underneath Panel lines rivets model will lift out ordinary class Lines produced means masking tape layer tape average depth two heavy panel lines Unthinned primer brushed along edge tape dry primer sanded down sur face feathered adjacent area Remove tape panel line appears curved lines edges fillets exam ple use vinyl electrical tape lines intersect sanding operation must done care avoid removing exist ing line No single finishing operation can realistic surface application panel lines Round-head rivets can simulated droplets Wilhold R/C-56 glue Woin Jet Age Air Force 1@ Ih I I I Jet Age Ducted Fans 5 6 units featuring blade tip seals suspension mountings Jet Age fan future Lear Jet Length 94 Width 76 Weight 18 lbs SR-71 Length 107 Width 54 Weight 22 lbs S3A ng Length 54 Width 68 Weight 12 ib I I I I ii Send $200 A5428 Bushneii COMPLETE BROCHUREI UIRiverside CA 92506 Refunded first orderMODEL AIRCRAFT CO714 687-3836 J Lines drawn pencil make location rivet rows Short intersecting lines mark location rivet certain true spacing alignment time-consuming part rivet-making job Applying droplets glue amazingly quick operation Spill small pool glue plastic metal plate Dip round toothpick pool transfer adhering drop airplane setting carefully line intersection rivet shape isnt satisfactory can wiped clean Size rivet head can controlled cutting toothpick end form larger-diameter applicator system rivets can formed rate two seconds tedious task worth effort Flush-type rivets can depicted twirling sharpened brass tube over pencil line intersections leave circular indentation Brush-painting over meticu lously-applied detail may tend spoil effect Spraying color lightly minimum buildup paint will preserve detail Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI S3018 Models Thought framework quite obscure Needs covering thats fine effect cure Lou Roberts RC Soaring/Pruss Continued page 51 channel flying field crowd ed Thirty-minute flights further reduced Power/Soaring compatibility car pools church picnics some trade shows Judging some newsletters come way again might harmony between two groupsif can stand noise unadulterated muf fled flying fields giving way highrises highways hybrid crops teamingup might means survival Surely addition new frequencies makes manageable However still might have trouble LSF Level V two-hour duration flight Sunday afternoon Last September scribe witness Soaring meet teaming-up way fly lasted two whole days because national contest Im referring aero-towing event An event like powered planes tow Sailplanes altitude re lease Although has tried USA quite successfully experimental basis sport level least two countries France Germany quite popular event Munich Germany last September event featured Scale powered aircraft Continued page 148 April 1985 145 MODEL KITS INCLUDE Complete fiberglass construction Ducted fan units Hardware Optional retracts Rossi-Picco OS engines Factory-Direct Pricing SR 71-S/S 1/12 Scale 2-80 Engines $46400 Lear Jet 1/6 Scale 280 Engines $39500 S-3A Viking 1/12 Scale 2-45 Engines $28800 towing Scale Sailpianes part latter quarter-scale class powered planes included Pitts Po lish Wilga several Super Cubs tow planes Munich Aero Club flying site provided city Although site too small Sail plane flying know because linelength requirements its nearly perfect aero-tow event Trimmed grass paved black-top runway help men tion well-equipped clubhouse designed vexy well inside rainy days because rain inter mittent two days difficult get coverage hoped Because weather Sailplanes werent set up once onetime 18 beauties pit area dog among Others still cars vans under plastic sheets mechanics nero-tow setup launch procedures simple case latter became routine 300th launch Paragon launching system 25-meter length heavy-duty monofilament line used type line common European fliers 100-lb nylon line know would serve quite well Since tow planes equipped topmounted wing simple servo-operated release mechanism mounted top wing center gravity turn also placed attach point close center drag Sailplanes designed equipped attach release towline Sailplanes nose manner unlike full-scale counter parts Launch procedures follows routine mentioned before signal between tow plane Sailplane fliers former would begin normal takeoff Because slower flying speed Sailplanejust full-scaleit would take off just before tow plane got airborne Because towline attach point Glider right nose stability during tow natural child being pulled sled climbout continued straight ahead until safe altitude reached big lazy climbing 3600 turn executed placing tow plane Sailplane over field safe enough altitude release During climb turn gradual enough practically no control inputs necessary Sailplane Release altitude 360 com pleted always high enough complete required maneuvers altitude reached Sailplane released line began its task meantime tow plane cut its power came down approach dropping towline off side landing area came back around landing towline equipped small banner few meters ahead Sailplane just make lo cating easier after dropped score sheet type Sailplane flying simple judging subjective yet meet didnt see anyone gripe Mandatory maneuvers scored takeoff 10-second straight level flight after tow release followed figure eight After three completed flier choice doing three six listed maneuvers three done sequence order earn points six listed procedure turn slip three-turn spiral using least 45 degrees bank loop stall figure flier chosen before flight final maneuver scored land ing Besides quality landing itself bonus scored according third runway touch-down occurred above maneuvers seem too tame Worldbeater 12 remember event Scale birds ones saw museum quality maneuvers ac complished way down since lot type flying occurs days thermals another country weekend saw kind conditions So power-flier buddies 148 Model Aviation InvIted join lIt National Soaring Society OFFICIAL SOARING SPECIAL INTEREST GROUF YEARLY NATIONAL TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS FROGRAM EXCELLENT SI-MONTHLY NEWSLETTER NSS CONTRIBUTES SUBSTANTIAL AMOUNTS TO EACH F3B SOARING TEAM NES IS RESPONSIBLE FOR THE ORGANIZATION AND OVERSEEING OF AMA NATE INCLUDING AWARDS BANQUET YEARLY DUES ARE S12OG SPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL Ii DISTRICTS 4 C hew Asat 1v K Adjet HEAD LON tenet Cnaietr Ami44 SI Jaik LE cYL $3795 1 CYL $4495 HEAD LOCK On-Board FLThITNNIE ThAD S[CJ LANDNIS Fits 0S 4 stroke & standard glow plugs Canpiete IlfloAl If%JC lhrk HI GP connector external start external start/charge jack charger w/HEAD IIXIC connector quality 12 Nicad w/nrjunt Ccvnpletely assenbied ready imunt nothing else boy l nade RC Soaring/Pruss Continued page 145 HOlDV COLLECT PIENTPOL SCOUT PAN E CULATE Intomaron Contacts JOHN R VOGEL 906 ORCHARD PARk OR CIBSONIA PA 15044 want try something different exciting both ends towline try aero towing dont have start off exotic mega-buck Scale bird either Dust off old floater rig simple tow release nose have tow bird want workhorse rather some sleek Pattern ship gents Munich using ships 60 90 cu displacements fifth- quarter-scale ships really want some fin challenge launching partner spotlanding contest Hes got make dead stick after might get old flying field back youre almost sure win free lunch him Back lathe January column mention made some pretty fine publications available wrong price SFVSF TechnicalAnthology goes $1250 $10 stated Have sent some money support USA F3B team Good lift Dan Pruss 131 E Pennington Ln Plainfleld IL 60544 RC Electrics/Kopski Continued page 53 quite close agreement published AFT lends lot credibility confidence own feelings about whats presented highly-detailed description Unger 18 can found December 1984 Ampere Flyer electrical data measured digital volt amp meters rpm read analog tach estimated accuracies 2% respec tively two electrical parameters accuracy plus resolution tach estimated ase absolute accuracies important relative results motors run over load power input ranges would personally use own planes As noted times before conservative approach Electric want motors batteries whatever run well last long help assure dont push anything Thus some motors may advertised capable running higher power levels generally hold operating conditions below maximum Also practical reasons usually dont bother testing much beyond 20 volts because Id rather fly cellsits too much trou ble charge such pack same sense usually wont test much beyond 20 amps because Id rather have some reasonable flight duration Besides such heavy currents tend reduce system effi ciencies rapidly due PR losses studying table youll notice motors tested same rpm limits same props general ly because either operating voltage current reached upper limit Signal Guard blocks random noise off-frequency signals can cause loss control air land RO models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit cared test Thus some motor large prop would tend draw high current relatively low applied voltage inverse might true another motor Among other things could due nature armature winding design some intended application motor See February 1985 MA Thus other parameter might limit first course condi tions some in-between prop sizes would permit both voltage current top out about same time thus producing highest possible power levels listed Finally some missing obviously desirable test points result oversight during hectic testing Sorry want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal GuardTM major credit card send $150 check money order PO Box 30179 Portland OR 97230 Oregon call collect 503-257-0912 So does use informa tion select motor impor tant consideration particular appli cation example youre primarily interested long lazy sport flying choose motor/prop produces necessary power level relatively higher voltage lower currenta given bat tery will last longest other hand prefer highpower bursts short duration some competitive reason go other way around Select motor/prop uses fewest smallest cells lightest-weight pack will still meet current de mand desired short motor run time theres intermediate approach should appeal hotter sport April 1985 149 90 day warranty cted dealerships available