E Racing EJBiII Lee path Khandle K 4-y handle r path handle handle FIGURE Increased Flying Radius No Lead Center rotation plane handle 4 plane FIGURE 2 Decreased Flying Radius No Lead IN THE LAST column mentioned special interest publications available Gazette FAI Control Line Society North American Speed Assoc Well give idea just what youre missing Im going take column probably next present article out Gazette should interest racing followers pilots sure offi cials well title Flying Tactics Flying Rules Race Performance article written world re nowned purveyor wisdom MarIon Gofast As copy article reserve right editorial comment sorry about Marion word explanation though before get article written specially FAI Team Race calculations directed facet Control Line Racing However technique described results quantitative events like Rat still describe what going center circle now article Section Before can talk about flying competition speed fly ing alone affected way flying done has pretty well under stood end will try show first section pilot action connected speed racer timed sec tion will end up method estimat ing just much speed gained lost flying technique Assume pilot center flying inside 3-meter radius flying cir cle someone outside stopwatch timing him ten laps please no old eight- four-lap bad habits held over AMA racingmy apolo gies Dunkin Wright Oh well cant win em allWRL person outside computes speed ten-lap times apparent speed example plane flown arm extended distance covered kilometer per ten laps formula used speed calculations sumed standard one-kilometer dis tance ten laps say FAT speed plane flies pylon Since everyone has electronic calcula tors days formulae given low Although rounded off provide accuracy need youre timing millisecond timing errorcontinued page 92 K TABLE 1APPROXIMATE DIMENSIONS FOR FIGURES 1 AND 2 Fig 1 2 Line Length 1 Handle path Radius r 522215921030 522215921 O30 Aircraft flying radius 53221622 51221562 Apparent gain speed 100 mi/hr racer 2032 2032 Change Ten-Lap time 43 A3 prone Center Rotationre 00 FIGURE 4Flying Radlusu Line LengthPilot Lags Plane handle Center Rotation FiGURE 5 Fiying Radius Increased 5 3 Speed GoininMPH handle FIGURE 3 FlyIng Radius u Line Length Pilot Leads Plane plane Pilot Leads Plane Plane Center v4 \ 0 2 20 gO 10 0-s rototion -20 Conditions ColCulotions 0I23q4hplmi/hr Scale FeetFIGURE 6 Speed Change Chart 16 oz FAI Lines -10 June1977 29 NEW FORD TRI MOTOR 1195 Unique because such amazing scale det~ kits relatively ~thing sor1 ways sueh- 0ur ~dging U thlflW see oUr neW chaflne wail another bOOtS oil yourclearly shown WIt . ruignly detailed Plastic Parts s uing touch realism-in-miniature NEW MESSERSCHMITT 495 ready bolt place-Complete control system less handle lines decals landing gear wheels etc makes building cinch assembly literally minutes can use 049 enpine ZERO Nifty control line models Theyre easiest ones world assembleall wood no tissue coveringonly 6 9 parts depending model ex cept Biplanes have few Genuine Nylon motor mount THEYRE AT YOUR DEALER GET OVER AND SEE THEM NOW . Continued page 91 nuts secure 4 X 40 AlIen bolts Now place cabin top place secure normal manner cabin top can now removed disturbing former 9 make needed adjustments ra dio receiver can mounted area ahead aluminum bearing box eliminates need servo extensions Next months column will cover external needle-valve extension glow-plug connectors landing-gear improvements head modifications have complaint about way end column intended smart remark rather word en couragement have yet see person fail learn fly put mind So word encouragement say youre flying its because trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 Snake/Lambert continued page 26 life best HP has moving part impregnated Assembly Special care should taken installing ring distort bend Make sure boost transfer ports case liner match Always use new gaskets over tighten bolts Prop Bartel 8 X 8 Tornado type what use varying pitch engine good rule thumb use strokeprop relation stock cranks will vary up 010 stroke 728-730 67 pitch stroke 13T-734 7A7 pitch stroke 735-J37 78 pitch Fuel 55% nitro 25% methanol 15% MA 2270 5% castor oil ideal mix ture Good commercially available fuels Nitrotane Magnum Plugs Fireball Cool seal epoxied Gb-bee Flying takeoff slight down elevator leading plane should applied Caution should taken wind direc tionalways takoff down wind cross wind have questions please contact Address 718 Boston Ave South Day tona FL 32019 CL Racing/Lee continued page 29 Speed kilometers/hour3600/T Speed miles/hour 2237/T T formula above time seconds fly ten laps reason using speed can measure easily thing really counts Now person assumed out flying let us perform some ex periments determine relation tween speed technique easiest effects understand occur plane flying circular pathno yo-yo eg pulling arm suddenly reduce flying circle radius no wind pilot leading holding back airplane does continually just fraction lap handle airplane will both move circle steady rate short what called steady state opera tion established Under condi tions two kinds effects due changed flying radius tributable power added subtracted leading holding back plane discussion purposes say speed achieved flown FAT pylon standard Compared flying speed pylon plane flown according new Team Race rules center rotation handle plane line line length effectively creased Except tiny increase line drag true air speed will change speed based time per lap goes down because aircraft flies further 100 meters per lap pilots hand moves one-foot 3 meter radius cir cle example handle between airplane center rotation about 2% decrease timed speed see Fig 1 Table pilot gets way behind plane lines pass over left shoulder center rotation tween handle plane effect reversed see Fig 2 Most us thought latter position Herb Stocton flies Herb probably just setting up pass Note Fig 2 shortening radius means pilot must lean toward plane flies lines will come off left shoulder Increasing radius just reverses things Note net change 86 seconds time fly ten laps neither pilot whipping discussion above illustrated ap parent speed change changing fly ing radius whipping Before dis cussing general case two special cases will discussed two cases will maintaining same flying radius approximately changing speed leading lagging might call pure whipping case first shown Fig 4 natural flying pos ture beginners sport fliers sume being instructed pilot walks around circle lines perpendicular shoulders Fig 3 pilot walks backward might right after pass AMA competition legally its whippingWRL some stunt fliers between maneu vers get high maneuver entry speeds calculation example world-class racer speed lost 5 mi/hr Fig 4 Fig 3 speed gained 6 mi/hr reason gain loss 92 Model Aviation Nil EU SPAN 345 SCALE % IGER MOTH 1295 BEGINNERS feedback pilot whips airplane speed increases increasing line ten sion further increases effect whipping Table II summarizes four positions discussed far detect case line drawn center rotation will go right through shoulders pilot will case in termediate positions TABLE 2 FOUR BASIC FLYING POSITIONS AND IDENTIFYING FEATURES Increased flying radius no lead see Fig 1 pilot leans away airplane shoulders parallel lines right shoulder closest plane pilot plane face same way pilot seems walk straight ahead Decreased flying radius no lead see Fig 2 pilot leans toward airplane shoulders parallel lines left shoulder closest plane pilot faces opposite direction plane pilot seems walk straight ahead Little change flying radius pilot leads plane see Fig 3 pilot faces plane shoulders right angles lines right shoulder towards center rotation pilot walks backward Little change flying radius pilot lags plane see Fig 4 pilot faces airplane shoulders right angles lines left shoulder towards center rotation pilot seems walk straight ahead lot flying stances other four just discussed course involve leading lagging air plane handle will ahead behind line drawn through center rotation airplane handle ahead line displaced direc tion flight pilot leading plane commonly whipping handle behind pilot lagging condition no slang word equivalent would like coin word placeit could call whoaing maybe dewhip pingor.. FAT team racer line tension 10 15 pounds 44 67 Newtons planes little lead line tension pointed slightly forward added thrust force force causes power input plane faster heavier plane added power given lead horsepower thats taken away given lag too help fix ideas specific example will given Consider world-class racer capable flying 100 mi/hr 161 km hr pylon mass equivalent weight 100 lbs 454 gin FAT speed pylon line tension would about 128 lbs 563 Newtons Assume pilot flies handle 20 feet 61 meters center rotation leads plane 5 feet 15 meters power input plane line WIN SCHOLARSHIP 1ST $1500 2ND $750 3RD $250 SPONSORED BOEING MANAGEMENT ASSOCIATION ENTER THE 8TH ANNUAL MODEL AERONAUTICS SCHOLARSHIP CONTEST JULY 9&10 1977 BOEING SPACE CENTER KENT WASH WRITE TO ThE BOEING MANAGEMENT ASSOC PO BOX 3707 SEATTLE WASH 98124 ATTENTION TED CAPUTO PO BOX 3707 MIS 17-26 TEL 206 655-6130 116 TROPHIES-AWARDS 3 SCHOLARSHIPS JR & SR AGE GROUP 19 SCHOLARSHIP EVENTS FREE FLIGHT CONTROL LINE RIC DESIGN CRAFTSMANSHIP 165 horsepower 445 watts Consider ing thrust power engine about 4 horsepower 11 watts cludes propeller efficiency substantial increase top view Fig S shows what meant Clearly racer will loose some speed because flying larger radius circle will also gain because airplane will fly faster due extra power whole problem find out exactly what net effect considering both effects As turns out example net loss about mi/hr have done lot calculation explain what done going through bunch formulae can send 12 OPEN EVENTS El FREE FLIGHT El CONTROL LINE El R/C you want assumptions explanations given follows position handle relative cen ter rotation airplane given problem calculate resulting change apparent speed given airplane First effective flight circle radius geometry calculated centrifugal force related line tension line tension plus lead lag lines relative airplane show much extra thrust being ap plied Assuming engine thrust power constant resulting increase air speed computed effect assumes power required propor Continued page 94 June 1977 93 I 50L210GLH II foam wing$169550L211GLH II built-up wing $1895 Plamms mnd complete atulog refunded NAME lit class mailADDRESS nanuling eli other CITY STATE LIE tinued page 93 tional cube speed Once flying speed known effective flight circle radius also known time ten laps apparent speed can computed Ive done cases results shown Fig 6 Calculations done assumed world class racer described above use Fig 6 just imagine center rotation marked plane way off paper direction indicated imagine handle position somewhere relation read gain loss speed off graph positions shown figures marked graph small dot corresponding figure number next next section next column WRL will describe unsteady yo-yo effects wind effects take up flying tactics Editors Note Inadvertently left out last issue copy below re lated three-view Shadow issue new comers FAT TR out central Florida area team Walt Perkins Pete Fain brough Walt Pete have developed design TR call Shadow design its fourth stage now good looking design pleasing aspects design Shadow boys have plans carbon fiber reinforced fiberglass body sale $25 kit consists glass body plans plane set drawings fuel shutoff Walt Pete use Ive included drawing column actually May issueEd will give idea what Shadow Get touch Walt 1100 SE 28th St Ocala FL 32670 W R Lee 3522 Tamarisk Lane Mis souri City TX 77459 CL Combat/Johnson continued page 30 Only MACA members listed contests entered MACA member counted Only WAM AMA sanc tioned meets included Getting latest news just benefits being MACA member join worlds largest combat organiza tion send $600 new MACA Treas urer Pat Sak 309 5 Kansas Edwards ville IL 62025 $1000 overseas way Gary Frost has re-elected President Ben Sasnett remains newsletter editor What go Fourth July holiday USA team selection will take place St Louis July 2 3 would like position US team better send $2500 entry fee AMA HQ pronto Also purchase $500 type FAT stamp tell friend Two double eliminations meets will held winner Saturday assured team spot well Sundays top placer other top finishers fly off remaining position first sec ond alternate Dont worry about de tails just bring lots planes favorite pit person entry deadline June 15 get bucks AMA right awayafter date its $5000 entry money goes FAI travel fund MACA N/L has alive proposals run select team complete diagrams sketches 8 X 10 glossies exception about half dozen MACA members no else has participated inter national contest big talkers last summer needed Preliminary World Championships Holland Unfortunately looks like Dutch International will held about same time Nationals no date has set British Nationals yet So get feet wet some big time FAT Competition California Criterium will held Los Angeles over Memorial Day weekend 94 Model Aviation urn coo len
Edition: Model Aviation - 1977/06
Page Numbers: 29, 92, 93, 94
E Racing EJBiII Lee path Khandle K 4-y handle r path handle handle FIGURE Increased Flying Radius No Lead Center rotation plane handle 4 plane FIGURE 2 Decreased Flying Radius No Lead IN THE LAST column mentioned special interest publications available Gazette FAI Control Line Society North American Speed Assoc Well give idea just what youre missing Im going take column probably next present article out Gazette should interest racing followers pilots sure offi cials well title Flying Tactics Flying Rules Race Performance article written world re nowned purveyor wisdom MarIon Gofast As copy article reserve right editorial comment sorry about Marion word explanation though before get article written specially FAI Team Race calculations directed facet Control Line Racing However technique described results quantitative events like Rat still describe what going center circle now article Section Before can talk about flying competition speed fly ing alone affected way flying done has pretty well under stood end will try show first section pilot action connected speed racer timed sec tion will end up method estimat ing just much speed gained lost flying technique Assume pilot center flying inside 3-meter radius flying cir cle someone outside stopwatch timing him ten laps please no old eight- four-lap bad habits held over AMA racingmy apolo gies Dunkin Wright Oh well cant win em allWRL person outside computes speed ten-lap times apparent speed example plane flown arm extended distance covered kilometer per ten laps formula used speed calculations sumed standard one-kilometer dis tance ten laps say FAT speed plane flies pylon Since everyone has electronic calcula tors days formulae given low Although rounded off provide accuracy need youre timing millisecond timing errorcontinued page 92 K TABLE 1APPROXIMATE DIMENSIONS FOR FIGURES 1 AND 2 Fig 1 2 Line Length 1 Handle path Radius r 522215921030 522215921 O30 Aircraft flying radius 53221622 51221562 Apparent gain speed 100 mi/hr racer 2032 2032 Change Ten-Lap time 43 A3 prone Center Rotationre 00 FIGURE 4Flying Radlusu Line LengthPilot Lags Plane handle Center Rotation FiGURE 5 Fiying Radius Increased 5 3 Speed GoininMPH handle FIGURE 3 FlyIng Radius u Line Length Pilot Leads Plane plane Pilot Leads Plane Plane Center v4 \ 0 2 20 gO 10 0-s rototion -20 Conditions ColCulotions 0I23q4hplmi/hr Scale FeetFIGURE 6 Speed Change Chart 16 oz FAI Lines -10 June1977 29 NEW FORD TRI MOTOR 1195 Unique because such amazing scale det~ kits relatively ~thing sor1 ways sueh- 0ur ~dging U thlflW see oUr neW chaflne wail another bOOtS oil yourclearly shown WIt . ruignly detailed Plastic Parts s uing touch realism-in-miniature NEW MESSERSCHMITT 495 ready bolt place-Complete control system less handle lines decals landing gear wheels etc makes building cinch assembly literally minutes can use 049 enpine ZERO Nifty control line models Theyre easiest ones world assembleall wood no tissue coveringonly 6 9 parts depending model ex cept Biplanes have few Genuine Nylon motor mount THEYRE AT YOUR DEALER GET OVER AND SEE THEM NOW . Continued page 91 nuts secure 4 X 40 AlIen bolts Now place cabin top place secure normal manner cabin top can now removed disturbing former 9 make needed adjustments ra dio receiver can mounted area ahead aluminum bearing box eliminates need servo extensions Next months column will cover external needle-valve extension glow-plug connectors landing-gear improvements head modifications have complaint about way end column intended smart remark rather word en couragement have yet see person fail learn fly put mind So word encouragement say youre flying its because trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 Snake/Lambert continued page 26 life best HP has moving part impregnated Assembly Special care should taken installing ring distort bend Make sure boost transfer ports case liner match Always use new gaskets over tighten bolts Prop Bartel 8 X 8 Tornado type what use varying pitch engine good rule thumb use strokeprop relation stock cranks will vary up 010 stroke 728-730 67 pitch stroke 13T-734 7A7 pitch stroke 735-J37 78 pitch Fuel 55% nitro 25% methanol 15% MA 2270 5% castor oil ideal mix ture Good commercially available fuels Nitrotane Magnum Plugs Fireball Cool seal epoxied Gb-bee Flying takeoff slight down elevator leading plane should applied Caution should taken wind direc tionalways takoff down wind cross wind have questions please contact Address 718 Boston Ave South Day tona FL 32019 CL Racing/Lee continued page 29 Speed kilometers/hour3600/T Speed miles/hour 2237/T T formula above time seconds fly ten laps reason using speed can measure easily thing really counts Now person assumed out flying let us perform some ex periments determine relation tween speed technique easiest effects understand occur plane flying circular pathno yo-yo eg pulling arm suddenly reduce flying circle radius no wind pilot leading holding back airplane does continually just fraction lap handle airplane will both move circle steady rate short what called steady state opera tion established Under condi tions two kinds effects due changed flying radius tributable power added subtracted leading holding back plane discussion purposes say speed achieved flown FAT pylon standard Compared flying speed pylon plane flown according new Team Race rules center rotation handle plane line line length effectively creased Except tiny increase line drag true air speed will change speed based time per lap goes down because aircraft flies further 100 meters per lap pilots hand moves one-foot 3 meter radius cir cle example handle between airplane center rotation about 2% decrease timed speed see Fig 1 Table pilot gets way behind plane lines pass over left shoulder center rotation tween handle plane effect reversed see Fig 2 Most us thought latter position Herb Stocton flies Herb probably just setting up pass Note Fig 2 shortening radius means pilot must lean toward plane flies lines will come off left shoulder Increasing radius just reverses things Note net change 86 seconds time fly ten laps neither pilot whipping discussion above illustrated ap parent speed change changing fly ing radius whipping Before dis cussing general case two special cases will discussed two cases will maintaining same flying radius approximately changing speed leading lagging might call pure whipping case first shown Fig 4 natural flying pos ture beginners sport fliers sume being instructed pilot walks around circle lines perpendicular shoulders Fig 3 pilot walks backward might right after pass AMA competition legally its whippingWRL some stunt fliers between maneu vers get high maneuver entry speeds calculation example world-class racer speed lost 5 mi/hr Fig 4 Fig 3 speed gained 6 mi/hr reason gain loss 92 Model Aviation Nil EU SPAN 345 SCALE % IGER MOTH 1295 BEGINNERS feedback pilot whips airplane speed increases increasing line ten sion further increases effect whipping Table II summarizes four positions discussed far detect case line drawn center rotation will go right through shoulders pilot will case in termediate positions TABLE 2 FOUR BASIC FLYING POSITIONS AND IDENTIFYING FEATURES Increased flying radius no lead see Fig 1 pilot leans away airplane shoulders parallel lines right shoulder closest plane pilot plane face same way pilot seems walk straight ahead Decreased flying radius no lead see Fig 2 pilot leans toward airplane shoulders parallel lines left shoulder closest plane pilot faces opposite direction plane pilot seems walk straight ahead Little change flying radius pilot leads plane see Fig 3 pilot faces plane shoulders right angles lines right shoulder towards center rotation pilot walks backward Little change flying radius pilot lags plane see Fig 4 pilot faces airplane shoulders right angles lines left shoulder towards center rotation pilot seems walk straight ahead lot flying stances other four just discussed course involve leading lagging air plane handle will ahead behind line drawn through center rotation airplane handle ahead line displaced direc tion flight pilot leading plane commonly whipping handle behind pilot lagging condition no slang word equivalent would like coin word placeit could call whoaing maybe dewhip pingor.. FAT team racer line tension 10 15 pounds 44 67 Newtons planes little lead line tension pointed slightly forward added thrust force force causes power input plane faster heavier plane added power given lead horsepower thats taken away given lag too help fix ideas specific example will given Consider world-class racer capable flying 100 mi/hr 161 km hr pylon mass equivalent weight 100 lbs 454 gin FAT speed pylon line tension would about 128 lbs 563 Newtons Assume pilot flies handle 20 feet 61 meters center rotation leads plane 5 feet 15 meters power input plane line WIN SCHOLARSHIP 1ST $1500 2ND $750 3RD $250 SPONSORED BOEING MANAGEMENT ASSOCIATION ENTER THE 8TH ANNUAL MODEL AERONAUTICS SCHOLARSHIP CONTEST JULY 9&10 1977 BOEING SPACE CENTER KENT WASH WRITE TO ThE BOEING MANAGEMENT ASSOC PO BOX 3707 SEATTLE WASH 98124 ATTENTION TED CAPUTO PO BOX 3707 MIS 17-26 TEL 206 655-6130 116 TROPHIES-AWARDS 3 SCHOLARSHIPS JR & SR AGE GROUP 19 SCHOLARSHIP EVENTS FREE FLIGHT CONTROL LINE RIC DESIGN CRAFTSMANSHIP 165 horsepower 445 watts Consider ing thrust power engine about 4 horsepower 11 watts cludes propeller efficiency substantial increase top view Fig S shows what meant Clearly racer will loose some speed because flying larger radius circle will also gain because airplane will fly faster due extra power whole problem find out exactly what net effect considering both effects As turns out example net loss about mi/hr have done lot calculation explain what done going through bunch formulae can send 12 OPEN EVENTS El FREE FLIGHT El CONTROL LINE El R/C you want assumptions explanations given follows position handle relative cen ter rotation airplane given problem calculate resulting change apparent speed given airplane First effective flight circle radius geometry calculated centrifugal force related line tension line tension plus lead lag lines relative airplane show much extra thrust being ap plied Assuming engine thrust power constant resulting increase air speed computed effect assumes power required propor Continued page 94 June 1977 93 I 50L210GLH II foam wing$169550L211GLH II built-up wing $1895 Plamms mnd complete atulog refunded NAME lit class mailADDRESS nanuling eli other CITY STATE LIE tinued page 93 tional cube speed Once flying speed known effective flight circle radius also known time ten laps apparent speed can computed Ive done cases results shown Fig 6 Calculations done assumed world class racer described above use Fig 6 just imagine center rotation marked plane way off paper direction indicated imagine handle position somewhere relation read gain loss speed off graph positions shown figures marked graph small dot corresponding figure number next next section next column WRL will describe unsteady yo-yo effects wind effects take up flying tactics Editors Note Inadvertently left out last issue copy below re lated three-view Shadow issue new comers FAT TR out central Florida area team Walt Perkins Pete Fain brough Walt Pete have developed design TR call Shadow design its fourth stage now good looking design pleasing aspects design Shadow boys have plans carbon fiber reinforced fiberglass body sale $25 kit consists glass body plans plane set drawings fuel shutoff Walt Pete use Ive included drawing column actually May issueEd will give idea what Shadow Get touch Walt 1100 SE 28th St Ocala FL 32670 W R Lee 3522 Tamarisk Lane Mis souri City TX 77459 CL Combat/Johnson continued page 30 Only MACA members listed contests entered MACA member counted Only WAM AMA sanc tioned meets included Getting latest news just benefits being MACA member join worlds largest combat organiza tion send $600 new MACA Treas urer Pat Sak 309 5 Kansas Edwards ville IL 62025 $1000 overseas way Gary Frost has re-elected President Ben Sasnett remains newsletter editor What go Fourth July holiday USA team selection will take place St Louis July 2 3 would like position US team better send $2500 entry fee AMA HQ pronto Also purchase $500 type FAT stamp tell friend Two double eliminations meets will held winner Saturday assured team spot well Sundays top placer other top finishers fly off remaining position first sec ond alternate Dont worry about de tails just bring lots planes favorite pit person entry deadline June 15 get bucks AMA right awayafter date its $5000 entry money goes FAI travel fund MACA N/L has alive proposals run select team complete diagrams sketches 8 X 10 glossies exception about half dozen MACA members no else has participated inter national contest big talkers last summer needed Preliminary World Championships Holland Unfortunately looks like Dutch International will held about same time Nationals no date has set British Nationals yet So get feet wet some big time FAT Competition California Criterium will held Los Angeles over Memorial Day weekend 94 Model Aviation urn coo len
Edition: Model Aviation - 1977/06
Page Numbers: 29, 92, 93, 94
E Racing EJBiII Lee path Khandle K 4-y handle r path handle handle FIGURE Increased Flying Radius No Lead Center rotation plane handle 4 plane FIGURE 2 Decreased Flying Radius No Lead IN THE LAST column mentioned special interest publications available Gazette FAI Control Line Society North American Speed Assoc Well give idea just what youre missing Im going take column probably next present article out Gazette should interest racing followers pilots sure offi cials well title Flying Tactics Flying Rules Race Performance article written world re nowned purveyor wisdom MarIon Gofast As copy article reserve right editorial comment sorry about Marion word explanation though before get article written specially FAI Team Race calculations directed facet Control Line Racing However technique described results quantitative events like Rat still describe what going center circle now article Section Before can talk about flying competition speed fly ing alone affected way flying done has pretty well under stood end will try show first section pilot action connected speed racer timed sec tion will end up method estimat ing just much speed gained lost flying technique Assume pilot center flying inside 3-meter radius flying cir cle someone outside stopwatch timing him ten laps please no old eight- four-lap bad habits held over AMA racingmy apolo gies Dunkin Wright Oh well cant win em allWRL person outside computes speed ten-lap times apparent speed example plane flown arm extended distance covered kilometer per ten laps formula used speed calculations sumed standard one-kilometer dis tance ten laps say FAT speed plane flies pylon Since everyone has electronic calcula tors days formulae given low Although rounded off provide accuracy need youre timing millisecond timing errorcontinued page 92 K TABLE 1APPROXIMATE DIMENSIONS FOR FIGURES 1 AND 2 Fig 1 2 Line Length 1 Handle path Radius r 522215921030 522215921 O30 Aircraft flying radius 53221622 51221562 Apparent gain speed 100 mi/hr racer 2032 2032 Change Ten-Lap time 43 A3 prone Center Rotationre 00 FIGURE 4Flying Radlusu Line LengthPilot Lags Plane handle Center Rotation FiGURE 5 Fiying Radius Increased 5 3 Speed GoininMPH handle FIGURE 3 FlyIng Radius u Line Length Pilot Leads Plane plane Pilot Leads Plane Plane Center v4 \ 0 2 20 gO 10 0-s rototion -20 Conditions ColCulotions 0I23q4hplmi/hr Scale FeetFIGURE 6 Speed Change Chart 16 oz FAI Lines -10 June1977 29 NEW FORD TRI MOTOR 1195 Unique because such amazing scale det~ kits relatively ~thing sor1 ways sueh- 0ur ~dging U thlflW see oUr neW chaflne wail another bOOtS oil yourclearly shown WIt . ruignly detailed Plastic Parts s uing touch realism-in-miniature NEW MESSERSCHMITT 495 ready bolt place-Complete control system less handle lines decals landing gear wheels etc makes building cinch assembly literally minutes can use 049 enpine ZERO Nifty control line models Theyre easiest ones world assembleall wood no tissue coveringonly 6 9 parts depending model ex cept Biplanes have few Genuine Nylon motor mount THEYRE AT YOUR DEALER GET OVER AND SEE THEM NOW . Continued page 91 nuts secure 4 X 40 AlIen bolts Now place cabin top place secure normal manner cabin top can now removed disturbing former 9 make needed adjustments ra dio receiver can mounted area ahead aluminum bearing box eliminates need servo extensions Next months column will cover external needle-valve extension glow-plug connectors landing-gear improvements head modifications have complaint about way end column intended smart remark rather word en couragement have yet see person fail learn fly put mind So word encouragement say youre flying its because trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 Snake/Lambert continued page 26 life best HP has moving part impregnated Assembly Special care should taken installing ring distort bend Make sure boost transfer ports case liner match Always use new gaskets over tighten bolts Prop Bartel 8 X 8 Tornado type what use varying pitch engine good rule thumb use strokeprop relation stock cranks will vary up 010 stroke 728-730 67 pitch stroke 13T-734 7A7 pitch stroke 735-J37 78 pitch Fuel 55% nitro 25% methanol 15% MA 2270 5% castor oil ideal mix ture Good commercially available fuels Nitrotane Magnum Plugs Fireball Cool seal epoxied Gb-bee Flying takeoff slight down elevator leading plane should applied Caution should taken wind direc tionalways takoff down wind cross wind have questions please contact Address 718 Boston Ave South Day tona FL 32019 CL Racing/Lee continued page 29 Speed kilometers/hour3600/T Speed miles/hour 2237/T T formula above time seconds fly ten laps reason using speed can measure easily thing really counts Now person assumed out flying let us perform some ex periments determine relation tween speed technique easiest effects understand occur plane flying circular pathno yo-yo eg pulling arm suddenly reduce flying circle radius no wind pilot leading holding back airplane does continually just fraction lap handle airplane will both move circle steady rate short what called steady state opera tion established Under condi tions two kinds effects due changed flying radius tributable power added subtracted leading holding back plane discussion purposes say speed achieved flown FAT pylon standard Compared flying speed pylon plane flown according new Team Race rules center rotation handle plane line line length effectively creased Except tiny increase line drag true air speed will change speed based time per lap goes down because aircraft flies further 100 meters per lap pilots hand moves one-foot 3 meter radius cir cle example handle between airplane center rotation about 2% decrease timed speed see Fig 1 Table pilot gets way behind plane lines pass over left shoulder center rotation tween handle plane effect reversed see Fig 2 Most us thought latter position Herb Stocton flies Herb probably just setting up pass Note Fig 2 shortening radius means pilot must lean toward plane flies lines will come off left shoulder Increasing radius just reverses things Note net change 86 seconds time fly ten laps neither pilot whipping discussion above illustrated ap parent speed change changing fly ing radius whipping Before dis cussing general case two special cases will discussed two cases will maintaining same flying radius approximately changing speed leading lagging might call pure whipping case first shown Fig 4 natural flying pos ture beginners sport fliers sume being instructed pilot walks around circle lines perpendicular shoulders Fig 3 pilot walks backward might right after pass AMA competition legally its whippingWRL some stunt fliers between maneu vers get high maneuver entry speeds calculation example world-class racer speed lost 5 mi/hr Fig 4 Fig 3 speed gained 6 mi/hr reason gain loss 92 Model Aviation Nil EU SPAN 345 SCALE % IGER MOTH 1295 BEGINNERS feedback pilot whips airplane speed increases increasing line ten sion further increases effect whipping Table II summarizes four positions discussed far detect case line drawn center rotation will go right through shoulders pilot will case in termediate positions TABLE 2 FOUR BASIC FLYING POSITIONS AND IDENTIFYING FEATURES Increased flying radius no lead see Fig 1 pilot leans away airplane shoulders parallel lines right shoulder closest plane pilot plane face same way pilot seems walk straight ahead Decreased flying radius no lead see Fig 2 pilot leans toward airplane shoulders parallel lines left shoulder closest plane pilot faces opposite direction plane pilot seems walk straight ahead Little change flying radius pilot leads plane see Fig 3 pilot faces plane shoulders right angles lines right shoulder towards center rotation pilot walks backward Little change flying radius pilot lags plane see Fig 4 pilot faces airplane shoulders right angles lines left shoulder towards center rotation pilot seems walk straight ahead lot flying stances other four just discussed course involve leading lagging air plane handle will ahead behind line drawn through center rotation airplane handle ahead line displaced direc tion flight pilot leading plane commonly whipping handle behind pilot lagging condition no slang word equivalent would like coin word placeit could call whoaing maybe dewhip pingor.. FAT team racer line tension 10 15 pounds 44 67 Newtons planes little lead line tension pointed slightly forward added thrust force force causes power input plane faster heavier plane added power given lead horsepower thats taken away given lag too help fix ideas specific example will given Consider world-class racer capable flying 100 mi/hr 161 km hr pylon mass equivalent weight 100 lbs 454 gin FAT speed pylon line tension would about 128 lbs 563 Newtons Assume pilot flies handle 20 feet 61 meters center rotation leads plane 5 feet 15 meters power input plane line WIN SCHOLARSHIP 1ST $1500 2ND $750 3RD $250 SPONSORED BOEING MANAGEMENT ASSOCIATION ENTER THE 8TH ANNUAL MODEL AERONAUTICS SCHOLARSHIP CONTEST JULY 9&10 1977 BOEING SPACE CENTER KENT WASH WRITE TO ThE BOEING MANAGEMENT ASSOC PO BOX 3707 SEATTLE WASH 98124 ATTENTION TED CAPUTO PO BOX 3707 MIS 17-26 TEL 206 655-6130 116 TROPHIES-AWARDS 3 SCHOLARSHIPS JR & SR AGE GROUP 19 SCHOLARSHIP EVENTS FREE FLIGHT CONTROL LINE RIC DESIGN CRAFTSMANSHIP 165 horsepower 445 watts Consider ing thrust power engine about 4 horsepower 11 watts cludes propeller efficiency substantial increase top view Fig S shows what meant Clearly racer will loose some speed because flying larger radius circle will also gain because airplane will fly faster due extra power whole problem find out exactly what net effect considering both effects As turns out example net loss about mi/hr have done lot calculation explain what done going through bunch formulae can send 12 OPEN EVENTS El FREE FLIGHT El CONTROL LINE El R/C you want assumptions explanations given follows position handle relative cen ter rotation airplane given problem calculate resulting change apparent speed given airplane First effective flight circle radius geometry calculated centrifugal force related line tension line tension plus lead lag lines relative airplane show much extra thrust being ap plied Assuming engine thrust power constant resulting increase air speed computed effect assumes power required propor Continued page 94 June 1977 93 I 50L210GLH II foam wing$169550L211GLH II built-up wing $1895 Plamms mnd complete atulog refunded NAME lit class mailADDRESS nanuling eli other CITY STATE LIE tinued page 93 tional cube speed Once flying speed known effective flight circle radius also known time ten laps apparent speed can computed Ive done cases results shown Fig 6 Calculations done assumed world class racer described above use Fig 6 just imagine center rotation marked plane way off paper direction indicated imagine handle position somewhere relation read gain loss speed off graph positions shown figures marked graph small dot corresponding figure number next next section next column WRL will describe unsteady yo-yo effects wind effects take up flying tactics Editors Note Inadvertently left out last issue copy below re lated three-view Shadow issue new comers FAT TR out central Florida area team Walt Perkins Pete Fain brough Walt Pete have developed design TR call Shadow design its fourth stage now good looking design pleasing aspects design Shadow boys have plans carbon fiber reinforced fiberglass body sale $25 kit consists glass body plans plane set drawings fuel shutoff Walt Pete use Ive included drawing column actually May issueEd will give idea what Shadow Get touch Walt 1100 SE 28th St Ocala FL 32670 W R Lee 3522 Tamarisk Lane Mis souri City TX 77459 CL Combat/Johnson continued page 30 Only MACA members listed contests entered MACA member counted Only WAM AMA sanc tioned meets included Getting latest news just benefits being MACA member join worlds largest combat organiza tion send $600 new MACA Treas urer Pat Sak 309 5 Kansas Edwards ville IL 62025 $1000 overseas way Gary Frost has re-elected President Ben Sasnett remains newsletter editor What go Fourth July holiday USA team selection will take place St Louis July 2 3 would like position US team better send $2500 entry fee AMA HQ pronto Also purchase $500 type FAT stamp tell friend Two double eliminations meets will held winner Saturday assured team spot well Sundays top placer other top finishers fly off remaining position first sec ond alternate Dont worry about de tails just bring lots planes favorite pit person entry deadline June 15 get bucks AMA right awayafter date its $5000 entry money goes FAI travel fund MACA N/L has alive proposals run select team complete diagrams sketches 8 X 10 glossies exception about half dozen MACA members no else has participated inter national contest big talkers last summer needed Preliminary World Championships Holland Unfortunately looks like Dutch International will held about same time Nationals no date has set British Nationals yet So get feet wet some big time FAT Competition California Criterium will held Los Angeles over Memorial Day weekend 94 Model Aviation urn coo len
Edition: Model Aviation - 1977/06
Page Numbers: 29, 92, 93, 94
E Racing EJBiII Lee path Khandle K 4-y handle r path handle handle FIGURE Increased Flying Radius No Lead Center rotation plane handle 4 plane FIGURE 2 Decreased Flying Radius No Lead IN THE LAST column mentioned special interest publications available Gazette FAI Control Line Society North American Speed Assoc Well give idea just what youre missing Im going take column probably next present article out Gazette should interest racing followers pilots sure offi cials well title Flying Tactics Flying Rules Race Performance article written world re nowned purveyor wisdom MarIon Gofast As copy article reserve right editorial comment sorry about Marion word explanation though before get article written specially FAI Team Race calculations directed facet Control Line Racing However technique described results quantitative events like Rat still describe what going center circle now article Section Before can talk about flying competition speed fly ing alone affected way flying done has pretty well under stood end will try show first section pilot action connected speed racer timed sec tion will end up method estimat ing just much speed gained lost flying technique Assume pilot center flying inside 3-meter radius flying cir cle someone outside stopwatch timing him ten laps please no old eight- four-lap bad habits held over AMA racingmy apolo gies Dunkin Wright Oh well cant win em allWRL person outside computes speed ten-lap times apparent speed example plane flown arm extended distance covered kilometer per ten laps formula used speed calculations sumed standard one-kilometer dis tance ten laps say FAT speed plane flies pylon Since everyone has electronic calcula tors days formulae given low Although rounded off provide accuracy need youre timing millisecond timing errorcontinued page 92 K TABLE 1APPROXIMATE DIMENSIONS FOR FIGURES 1 AND 2 Fig 1 2 Line Length 1 Handle path Radius r 522215921030 522215921 O30 Aircraft flying radius 53221622 51221562 Apparent gain speed 100 mi/hr racer 2032 2032 Change Ten-Lap time 43 A3 prone Center Rotationre 00 FIGURE 4Flying Radlusu Line LengthPilot Lags Plane handle Center Rotation FiGURE 5 Fiying Radius Increased 5 3 Speed GoininMPH handle FIGURE 3 FlyIng Radius u Line Length Pilot Leads Plane plane Pilot Leads Plane Plane Center v4 \ 0 2 20 gO 10 0-s rototion -20 Conditions ColCulotions 0I23q4hplmi/hr Scale FeetFIGURE 6 Speed Change Chart 16 oz FAI Lines -10 June1977 29 NEW FORD TRI MOTOR 1195 Unique because such amazing scale det~ kits relatively ~thing sor1 ways sueh- 0ur ~dging U thlflW see oUr neW chaflne wail another bOOtS oil yourclearly shown WIt . ruignly detailed Plastic Parts s uing touch realism-in-miniature NEW MESSERSCHMITT 495 ready bolt place-Complete control system less handle lines decals landing gear wheels etc makes building cinch assembly literally minutes can use 049 enpine ZERO Nifty control line models Theyre easiest ones world assembleall wood no tissue coveringonly 6 9 parts depending model ex cept Biplanes have few Genuine Nylon motor mount THEYRE AT YOUR DEALER GET OVER AND SEE THEM NOW . Continued page 91 nuts secure 4 X 40 AlIen bolts Now place cabin top place secure normal manner cabin top can now removed disturbing former 9 make needed adjustments ra dio receiver can mounted area ahead aluminum bearing box eliminates need servo extensions Next months column will cover external needle-valve extension glow-plug connectors landing-gear improvements head modifications have complaint about way end column intended smart remark rather word en couragement have yet see person fail learn fly put mind So word encouragement say youre flying its because trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 Snake/Lambert continued page 26 life best HP has moving part impregnated Assembly Special care should taken installing ring distort bend Make sure boost transfer ports case liner match Always use new gaskets over tighten bolts Prop Bartel 8 X 8 Tornado type what use varying pitch engine good rule thumb use strokeprop relation stock cranks will vary up 010 stroke 728-730 67 pitch stroke 13T-734 7A7 pitch stroke 735-J37 78 pitch Fuel 55% nitro 25% methanol 15% MA 2270 5% castor oil ideal mix ture Good commercially available fuels Nitrotane Magnum Plugs Fireball Cool seal epoxied Gb-bee Flying takeoff slight down elevator leading plane should applied Caution should taken wind direc tionalways takoff down wind cross wind have questions please contact Address 718 Boston Ave South Day tona FL 32019 CL Racing/Lee continued page 29 Speed kilometers/hour3600/T Speed miles/hour 2237/T T formula above time seconds fly ten laps reason using speed can measure easily thing really counts Now person assumed out flying let us perform some ex periments determine relation tween speed technique easiest effects understand occur plane flying circular pathno yo-yo eg pulling arm suddenly reduce flying circle radius no wind pilot leading holding back airplane does continually just fraction lap handle airplane will both move circle steady rate short what called steady state opera tion established Under condi tions two kinds effects due changed flying radius tributable power added subtracted leading holding back plane discussion purposes say speed achieved flown FAT pylon standard Compared flying speed pylon plane flown according new Team Race rules center rotation handle plane line line length effectively creased Except tiny increase line drag true air speed will change speed based time per lap goes down because aircraft flies further 100 meters per lap pilots hand moves one-foot 3 meter radius cir cle example handle between airplane center rotation about 2% decrease timed speed see Fig 1 Table pilot gets way behind plane lines pass over left shoulder center rotation tween handle plane effect reversed see Fig 2 Most us thought latter position Herb Stocton flies Herb probably just setting up pass Note Fig 2 shortening radius means pilot must lean toward plane flies lines will come off left shoulder Increasing radius just reverses things Note net change 86 seconds time fly ten laps neither pilot whipping discussion above illustrated ap parent speed change changing fly ing radius whipping Before dis cussing general case two special cases will discussed two cases will maintaining same flying radius approximately changing speed leading lagging might call pure whipping case first shown Fig 4 natural flying pos ture beginners sport fliers sume being instructed pilot walks around circle lines perpendicular shoulders Fig 3 pilot walks backward might right after pass AMA competition legally its whippingWRL some stunt fliers between maneu vers get high maneuver entry speeds calculation example world-class racer speed lost 5 mi/hr Fig 4 Fig 3 speed gained 6 mi/hr reason gain loss 92 Model Aviation Nil EU SPAN 345 SCALE % IGER MOTH 1295 BEGINNERS feedback pilot whips airplane speed increases increasing line ten sion further increases effect whipping Table II summarizes four positions discussed far detect case line drawn center rotation will go right through shoulders pilot will case in termediate positions TABLE 2 FOUR BASIC FLYING POSITIONS AND IDENTIFYING FEATURES Increased flying radius no lead see Fig 1 pilot leans away airplane shoulders parallel lines right shoulder closest plane pilot plane face same way pilot seems walk straight ahead Decreased flying radius no lead see Fig 2 pilot leans toward airplane shoulders parallel lines left shoulder closest plane pilot faces opposite direction plane pilot seems walk straight ahead Little change flying radius pilot leads plane see Fig 3 pilot faces plane shoulders right angles lines right shoulder towards center rotation pilot walks backward Little change flying radius pilot lags plane see Fig 4 pilot faces airplane shoulders right angles lines left shoulder towards center rotation pilot seems walk straight ahead lot flying stances other four just discussed course involve leading lagging air plane handle will ahead behind line drawn through center rotation airplane handle ahead line displaced direc tion flight pilot leading plane commonly whipping handle behind pilot lagging condition no slang word equivalent would like coin word placeit could call whoaing maybe dewhip pingor.. FAT team racer line tension 10 15 pounds 44 67 Newtons planes little lead line tension pointed slightly forward added thrust force force causes power input plane faster heavier plane added power given lead horsepower thats taken away given lag too help fix ideas specific example will given Consider world-class racer capable flying 100 mi/hr 161 km hr pylon mass equivalent weight 100 lbs 454 gin FAT speed pylon line tension would about 128 lbs 563 Newtons Assume pilot flies handle 20 feet 61 meters center rotation leads plane 5 feet 15 meters power input plane line WIN SCHOLARSHIP 1ST $1500 2ND $750 3RD $250 SPONSORED BOEING MANAGEMENT ASSOCIATION ENTER THE 8TH ANNUAL MODEL AERONAUTICS SCHOLARSHIP CONTEST JULY 9&10 1977 BOEING SPACE CENTER KENT WASH WRITE TO ThE BOEING MANAGEMENT ASSOC PO BOX 3707 SEATTLE WASH 98124 ATTENTION TED CAPUTO PO BOX 3707 MIS 17-26 TEL 206 655-6130 116 TROPHIES-AWARDS 3 SCHOLARSHIPS JR & SR AGE GROUP 19 SCHOLARSHIP EVENTS FREE FLIGHT CONTROL LINE RIC DESIGN CRAFTSMANSHIP 165 horsepower 445 watts Consider ing thrust power engine about 4 horsepower 11 watts cludes propeller efficiency substantial increase top view Fig S shows what meant Clearly racer will loose some speed because flying larger radius circle will also gain because airplane will fly faster due extra power whole problem find out exactly what net effect considering both effects As turns out example net loss about mi/hr have done lot calculation explain what done going through bunch formulae can send 12 OPEN EVENTS El FREE FLIGHT El CONTROL LINE El R/C you want assumptions explanations given follows position handle relative cen ter rotation airplane given problem calculate resulting change apparent speed given airplane First effective flight circle radius geometry calculated centrifugal force related line tension line tension plus lead lag lines relative airplane show much extra thrust being ap plied Assuming engine thrust power constant resulting increase air speed computed effect assumes power required propor Continued page 94 June 1977 93 I 50L210GLH II foam wing$169550L211GLH II built-up wing $1895 Plamms mnd complete atulog refunded NAME lit class mailADDRESS nanuling eli other CITY STATE LIE tinued page 93 tional cube speed Once flying speed known effective flight circle radius also known time ten laps apparent speed can computed Ive done cases results shown Fig 6 Calculations done assumed world class racer described above use Fig 6 just imagine center rotation marked plane way off paper direction indicated imagine handle position somewhere relation read gain loss speed off graph positions shown figures marked graph small dot corresponding figure number next next section next column WRL will describe unsteady yo-yo effects wind effects take up flying tactics Editors Note Inadvertently left out last issue copy below re lated three-view Shadow issue new comers FAT TR out central Florida area team Walt Perkins Pete Fain brough Walt Pete have developed design TR call Shadow design its fourth stage now good looking design pleasing aspects design Shadow boys have plans carbon fiber reinforced fiberglass body sale $25 kit consists glass body plans plane set drawings fuel shutoff Walt Pete use Ive included drawing column actually May issueEd will give idea what Shadow Get touch Walt 1100 SE 28th St Ocala FL 32670 W R Lee 3522 Tamarisk Lane Mis souri City TX 77459 CL Combat/Johnson continued page 30 Only MACA members listed contests entered MACA member counted Only WAM AMA sanc tioned meets included Getting latest news just benefits being MACA member join worlds largest combat organiza tion send $600 new MACA Treas urer Pat Sak 309 5 Kansas Edwards ville IL 62025 $1000 overseas way Gary Frost has re-elected President Ben Sasnett remains newsletter editor What go Fourth July holiday USA team selection will take place St Louis July 2 3 would like position US team better send $2500 entry fee AMA HQ pronto Also purchase $500 type FAT stamp tell friend Two double eliminations meets will held winner Saturday assured team spot well Sundays top placer other top finishers fly off remaining position first sec ond alternate Dont worry about de tails just bring lots planes favorite pit person entry deadline June 15 get bucks AMA right awayafter date its $5000 entry money goes FAI travel fund MACA N/L has alive proposals run select team complete diagrams sketches 8 X 10 glossies exception about half dozen MACA members no else has participated inter national contest big talkers last summer needed Preliminary World Championships Holland Unfortunately looks like Dutch International will held about same time Nationals no date has set British Nationals yet So get feet wet some big time FAT Competition California Criterium will held Los Angeles over Memorial Day weekend 94 Model Aviation urn coo len