For Fun Test PROP IL IIODLS Thought simple rubber-powered profiles scale configurations justforfun did Youd surprised wealth informa tion author has learned models can applied fully developed detailed planes help assure flight sucess boot plans Kvushu Shinden profile EDon Srull RUBBER-POWERED profile models have around long time provide logical step young modelers ready gradu ate Hand-Launched Gliders stick models such famous AMA Cub excellent designs have appeared model press over years designers note publish numerous fine profile designs ol Scale author Mirage delta profile has 16 span produces 30 length long rubber motor plane required tandem counter-rotating props too much torque single prop short wingspan handle Two different profiles Japanese Shinden fighter aircraft lightweight version left full-size plans presented article proved design fine flier all-sheet version right bit heavier much sturdyfor outdoor use master Bill Hannan popularity profiles has enhanced considerably several fun-type competitive events offered Free Flight clubs example Flightmasters San Diego biteers DC Maxecuters Flying Aces Club sponsor profile events Scale Catapult Gliders Scale Rubber-Powered models Flying rather scale detail name game Another use skinny models also known No-Cals powered test vehicles new untried unconventional designs profile version new model design can very useful determining whether new design will suitable elegant model respect stability Perhaps important profile model can also help determine proper location center gravity CG necessary amount angular difference between wing stabilizer correct thrust angle minimum dihedral minimum stabilizer vertical fin sizes Thats bad small investment time materials eh results way just appropriate Rubber-Powered Scale models can also helpful powered Free Flight Scale Radio Control Scale models During recent years have built several dozen profile models both entry No-Cal contests test beds unusual Scale model config urations Delta wings flying wings canards pushers tandem twin-engine configurations have tried club members has built mastered unusual Blohm Voss asymmetrical configuration could have done fully built-up models aircraft course tremendous vestment time goodness knows much cussing profile test models inding1 possible determine fair accuracy what design deviations true scale necessary what complete trim arrangements produced good stable flight perform ance case flying wing design shall remain nameless found basic configuration real turkey darn thing problems way imaginableand some werent saved lot further wasted time frustration particular subject plus side particularly good luck profile model tests twin-engined pushpull Dornier Do335 Its potential seemed much better imagined put together larger built-up Rubber model Dornier subsequently -in RC Scale model same bird profile model pro vided good estimates wing/stab angular difference thrust angles dihedral requirements larger Rubber model As result very minor adjustments changes required after larger model built RC project similarly benefited also got lot useful information out canard profile model Japanese Navy ex perimental fighter Kyushu Shinden original model proved rather tricky adjust large part due no doubt August1982 55 V JN V /1 / / II II1 JAPANESE NAVY SHI NDEN 16 SPAN PROFILE 320t frail TRIM FOR RIGHT TURN POWER WITH 3/32 10 1/8 RUBBER LOOP16TO 20LONG 1/16 SHEET lBS R 1/2 DIHEDRAL / / 1/16x 1/8 IE 1/32 SHEET TABS COVER ALL SURFACES ONE SIDE WITH LIGHT TISSUE DO NOT WATER SHRINK OR DOPE 7/ 3/32 X 3/16 MOTOR STICK 1/18 SQ __ 56 Model Aviation II N 1/l5xVs TEI /V16 / / 1/8 DIHEDRAL I/ FORM BLADES ROUNDED 1/8 SQOVER COFFEE BALSA HUBCAN 4 FU50 AT IHlS LINE1/32 SHEET BLADES LEFT HAND PROP 2 1/2 DOWN 40 LEFT THRUST August1982 57 CG Built-Up Lighter Fragile Work Higher Performance / CA// 1fIr1rLight Tissue Coveringone both sides Light Simple All-Balsa Frameworkall surfaces Wooden Gear Balsa Wheels Balsa Prop Figure 4Holding Minor dowel rear peg Make slot Balsaleast 4- wide nose plug Laminated balsa nose block water-shrink dope lightweight modelsl Magic Markers thinly-sprayed model enamel OK color trim fact have built flown very few canards Eventually proper CG location found combined what seemed excessive amount angular difference between wing forward canard surface fairly large amount upthrust equivalent downthrust tractor configuration also found necessary adjustments Shinden demon strated exceptional flight performance sta bility lighter profile model built also larger built-up Rubber Scale model using same force arrangements original profile Lo behold built-in adjustments worked exactly profile very minor trimming required get both flying well Several other similar experiences have con vinced small profile models indeed provide accurate insight flight characteristics trim requirements larger built-up model Its simple fun way save time frustration take surprises out trimming large new beautiful Scale project might also steer away real dogs worth effort fight through flight trimming stages may have trimmed Free Flight Scale models before some procedures have found work pretty well certainly other ways go about trimming model tech niques may worth try start very easy profile model CG wing/stab angles idea determine combination C G wing tail angular difference provides just enough pitch up down stability dont want too much pitch stability will add unnecessary drag certainly cant get too little model wont fly general further forward CG greater stabilityand vice versa see Fig 1 want find point pitch stability disappears marginal move CG forward just little until adequate stability reappears First make absolutely sure flying surfaces straight free warps before testing Its surprising modelers experienced ones sometimes skip step After have determined surfaces true use modeling clay place CG point think should little rearward Keep rear hook prop bearing hole least 3116 V4 away motor stick rubber clearance 58 Model Aviation Figure 3Basic Consi Sturdy Simple S06 Plastic Prop ng sheet fuselage Hole Fuselage Motor Stick Motor stick Lightweight built-up fuselage thin sheet balsa Motor Tube fuselage builtMotor tube made 1164 1/32 sheet balsa rolled around dowel glued also can formed several layers tracing paper glued together Make tube di ameter least % Actually almost place between wing leading trailing edges will starter doubt place CG point one-third distance leading trailing edge Mark C G soft pencil can keep track have tested first tests somewhat easier remove propeller replace piece modeling clay equal weight models glide will better propeller changes want observe will easier see Leave prop isnt easy remove either put few turns rubber motor let free-wheel dont want thrust just want reduce drag prop during gliding tests first step gently glide model very few turns motor observe flight path During phase adjust elevator until get smooth descending glide Several glides trim setting will necessary make sure okay glide reasonably smooth continue Balance trim adjustments weird configurations like Blohm Voas BV141 ideal problema solving simple profiles felt-tip pen can wonders detailing otherwise plain all-sheet model mini Focke-Wuif Stosser shows benefits gliding model increasing speed until tossing harder ever would normal launch model tends zoom upward sharply loop too stable tends tuck nose under dive toward ground increased speeds unstable some quirk fate model continues shallow climb glides smoothly has small margin stability can proceed power tests Assuming model either zoomed upward dove ground move CG about ng modeling clay nose tail follows Move C G rearward clay tail bend elevator trailing edge down bit model zoomed upward Move CG forward clay nose bend elevator trailing edge up bit model dove After making C G incidence adjustments go back gentle launches Adjust elevator get smooth glide Repeat steps until have found CG remember marked time incidence combinations stable unstable use powered tests come next will just little forward marginally-stable point Table Fig 2 summarize process much clearly words Thrust line next step find proper thrust line angles Put very small amount rudder adjustment direction want flight path certain models clay weight wing tip works better rudder turn usually use left turn both power glide Once CG has established glide tests simply begin add more turns power flight tests proceed time use thrust angle changes get good power pattern adjustments pretty obvious cases point thrust line downward keep model zooming upward under first burst power point opposite direction Continued ~agc 143 August 1982 59 Rolfe Gregorys profile Wildcat simple impressive InuourImler Profiles easy build lots fun WW II airplanes like Hellcat tine tljers no LG clean lines have good duration help teach low-wing trimming sure etching well done slightest film copper will serve conductor high voltages resulting failure op-amp other high-voltage-sensitive parts Leads may pass using Teflon tubes 001 uF capacitors lead ground inside case ground RF needed external leads including trigger wires diodes around op-amp protect stray voltages lost two op-amps before diodes installed Herb WahI Hurleman-type plug has used over 50 hours great success low power engine relation cooling area 27 hours rich running made plug bit black still firing experimenting type spark system interests start coil can wind good coil rest relatively easy Good luck 15 mil wire will need Profiles/SruII Continued page 59 turn becomes too tight etc Use very small thrust changes degree two time since effect large under full power Dihedral angle tail area model cant made fly consistent circle either direction tightening its turn eventu ally diving probably have spiral stability problems especially common lowwing models little dihedral also appears some parasol configurations large vertical tail surfaces such Curtiss Junior case best remedy usually add dihedral abut two three degrees timeuntil problem subsides Another possible solution reduce vertical tail surface usually looks bad can also lead other stability problems Another tricky method worth try certain models add vertical side area above approximate CG position Walt Mooney sometimes does filling open cabane structure like Curtiss Junior has clear sheet thin plastic can hardly see it will sometimes trick another Walts models added large profile pilot figure otherwise empty cockpit added enough lateral area above CG low-wing model fly properly no dihedral Another problem occurs occasionally directional instability case model will tend wander direction somewhat will impossible adjust reliable turn pattern Unlike spiral stability problem men tioned above however model will tend spin fact directional wandering usually means model spirally stable simple cure difficulty increase vertical tail area find need large amount increase would spoil looks Scale creation can borrow another idea Walt Mooney add transparent tab vertical tail flight will hardly visible trying set CG incidence described earlier models flight path erratic pitch difficult get repeat able results horizontal tail surfaces may too small Add 20 30% horizontal tail area try again tinned page 144 COMPLETE THIS FOAM AND ATTACH MAILING LABEL FROM RECE NT E LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US Possessions elsewhere Including Canada MexIco $2400 US Schools $gOO US Libraries $1350 NAME ADDRESS CITY/STATE _____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW WASHINGTON DC 20005 August1982 143 distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER II INC 16650 South 104th AVENUE ORLANO PARK ILLINOIS 60462 soon bringing result years military research testing Watch Full Command Systems 908 E Rosewood Spokane WA 99207 509 487-2112 Other peculiar trimming problems may arise weird scale configurations can cutand-try solve little profile test machine problems discussed above ever tend common ones Scale models Construction methods case want try hand constructing profile model favorite airplane few design building tips observed published models models of local flying comrades two basic structural approaches allsheet surfaces built-up tissue-covered sur faces see Fig 3 built-up tissue-covered models can built lighter all-sheet models fore have potentially higher flight perform ance usually used profiles intended primarily Indoor flying bit time consuming build although very simple tend somewhat fragile solid sheet counterparts All-sheet models usually built thin 1/16 1/64 sheet balsa although local club members have using thin sheet foam plastic 1/32 3/32 thickness sheet plastic sliced large blocks dense blue-colored foamthe kind often used building insulation some areas foam material extremely easy use profile models believe partly respon sible popularity profiles club foam lighter balsa much less expensive As added bonus virtually warp-proof Flying outdoors damp grass cool damp evenings can quickly turn conven tional balsa-and-tissue models useless pret zels unless lots dope other moisture Tired stamped sheet-metal flat glow plug wrenches find 4way cast-metal ones clumsy use Bee Twister answertO prayers handle carefully shaped com fortable fit hand design makes easy reach plug buried deep inside cowling compact tool fits easily field box wrench designed fit popular glow plugs including GbBees its attractive plastic handle proudly displays Gb Bee logo shaft steel Get local hobby shop product review product review product review 144 Model Aviation product review product review product review Shape Things Come Technology-2000 D Designed Full Command Systems Canadian governments target drone program Full Command has now brought cutting edge Radio Control Technology hobbiest shaped like Old Fashioned radios Full iand Systems will Bee Twister glow plug wrench No 4228 $300 GloBee Division Twinn-K Inc PO Box 31 228 India napolis IN 46231 4E*SE5a KITS 1/4 SCALE SEMI KIT13900 1/4 SCALE COMPLETE KIT. 19900 1/3 SCALE SEMI KIT16900 1/3 SCALE COMPLETE KIT.22900 PLEASE ADD $750 FOR SHIPPING i/4 3CALE SPAN 80 WEIGHT 201 ENGINE QUADRA 1/3 SCALE SPAN 106 WEIGHT 781 ENGINE QUADRA SEMI 51113 CONTAIN SAWED AND SANDED FORNERS WALL WING RIBS TIPS RUDDER AND STAB OUTLINED SIZE PLAPS CPLETE KItS CONTAIN THE ADOYR PARTS ALL PINE AND BALSA STRIP WOOD WARE SEND *1 00 FOR OUR OWIPLETE CATALOG PHDNE 1419 599-2121 proofer has used case all-sheet profile models very simple build can easily decorated felt-tip pens excellent projects begin ners just getting powered Free Flight models Holding motor prop Fig 4 shows three basic ways support rubber motor model 1 hole fuselage 2 motor stick 3 motor tube classic most-used scheme hole fuselage method best suited forthe all-sheet balsa model fuselage rigid enough support fully wound motor weaker construction used such very thin sheet balsa foam built-up structure motor stick motor tube will required support pull fully wound motor motor stick can simple piece 3/32 3/16 balsa very lightweight models can small rolled tube 1/32 1/64 balsa Ia Indoor practice rubber motor also can fully enclosed fairly large diameter tube built part fuselage Such motor tube should least -in diameter provide sutlicient clear ance unwinding rubber motor tube can made wrapping 1/32 1/64 balsa several layers paper around dowel Attaching prop Fig 5 shows different types prop bearings used motor sticks Remember trying new novel design allowance should made easy thrust-line adjustments fixed thrust bearings have cut off re-glued time thrust line changed sample proflle design build would like try practice profile model full-size plans provided 6-in-span version experimental Japanese Navy fighter Kyushu Shinden Construction built-up tissuecovered variety plans indicate CG. incidence thrust adjustments have worked models Flights over two minutes possible little bird Give try see can find other better trim settings Best luck new flight test tools FF Duration/Meuser Continued page 67 note Bill Bogart seems friend Bills dredged up report written Seredinsky both friend Seredinsky work ing Grumman So far have title page interior page Bill thought might find interesting shows airfoil cross sections labeled Modifications Airfoil Se 4410 first four sections original 1% LE radius modified version 3% nose radius turbulator wire ahead foil apparently something like sand stuck top surface over first 20% chord Number five now-familiar flamingo foil Also shown CL-vs-CD polars five sections derived model flight tests Reynolds-number range 45 000 tO 30000 Thtts live curves seem little /on smooth no experimental points arc shown makes feel little uneasy nevertheless. Worst hunch wis 3%-nose oh Ahie leg upwas un-modded Se 4410 1% nose came sandy surface mod original foil turbulator % diameter situated 7% ahead L E roughly 1% above bottom-surface chord line Best bunch flamingo its Hobby Shack RADIO RIOT BA 6 channel w/4 Ca 5-26 ser vos tull Ni Cd & char9er z9$16995 LIST $30995 5 channel w/4 ea S-26 ser vos dual rates full Ni-Cd LIST $27995 $15499 6 channel w/2dual rates 6 servos reversing switches 1ST $34995 U name3 U address cityU U statezip3 U mail order catalogs 18480 BANDILIER CIRCLE U FOUNTAIN VALLEY CA 928708 POSTAGE AND HANDLING CHARGES 3 $000 $2500 add $300 $2501 $5000 add $400 U Over $5000 add $500 California residents add 6% state sales tax mminmin August1982 145 kYShaCI CIRRUS I850 XLC system w/4 Lw OEft6N 649 APPIAN NAPOLEON OHIO 43545
Edition: Model Aviation - 1982/08
Page Numbers: 54, 55, 56, 57, 58, 59, 143, 144, 145
For Fun Test PROP IL IIODLS Thought simple rubber-powered profiles scale configurations justforfun did Youd surprised wealth informa tion author has learned models can applied fully developed detailed planes help assure flight sucess boot plans Kvushu Shinden profile EDon Srull RUBBER-POWERED profile models have around long time provide logical step young modelers ready gradu ate Hand-Launched Gliders stick models such famous AMA Cub excellent designs have appeared model press over years designers note publish numerous fine profile designs ol Scale author Mirage delta profile has 16 span produces 30 length long rubber motor plane required tandem counter-rotating props too much torque single prop short wingspan handle Two different profiles Japanese Shinden fighter aircraft lightweight version left full-size plans presented article proved design fine flier all-sheet version right bit heavier much sturdyfor outdoor use master Bill Hannan popularity profiles has enhanced considerably several fun-type competitive events offered Free Flight clubs example Flightmasters San Diego biteers DC Maxecuters Flying Aces Club sponsor profile events Scale Catapult Gliders Scale Rubber-Powered models Flying rather scale detail name game Another use skinny models also known No-Cals powered test vehicles new untried unconventional designs profile version new model design can very useful determining whether new design will suitable elegant model respect stability Perhaps important profile model can also help determine proper location center gravity CG necessary amount angular difference between wing stabilizer correct thrust angle minimum dihedral minimum stabilizer vertical fin sizes Thats bad small investment time materials eh results way just appropriate Rubber-Powered Scale models can also helpful powered Free Flight Scale Radio Control Scale models During recent years have built several dozen profile models both entry No-Cal contests test beds unusual Scale model config urations Delta wings flying wings canards pushers tandem twin-engine configurations have tried club members has built mastered unusual Blohm Voss asymmetrical configuration could have done fully built-up models aircraft course tremendous vestment time goodness knows much cussing profile test models inding1 possible determine fair accuracy what design deviations true scale necessary what complete trim arrangements produced good stable flight perform ance case flying wing design shall remain nameless found basic configuration real turkey darn thing problems way imaginableand some werent saved lot further wasted time frustration particular subject plus side particularly good luck profile model tests twin-engined pushpull Dornier Do335 Its potential seemed much better imagined put together larger built-up Rubber model Dornier subsequently -in RC Scale model same bird profile model pro vided good estimates wing/stab angular difference thrust angles dihedral requirements larger Rubber model As result very minor adjustments changes required after larger model built RC project similarly benefited also got lot useful information out canard profile model Japanese Navy ex perimental fighter Kyushu Shinden original model proved rather tricky adjust large part due no doubt August1982 55 V JN V /1 / / II II1 JAPANESE NAVY SHI NDEN 16 SPAN PROFILE 320t frail TRIM FOR RIGHT TURN POWER WITH 3/32 10 1/8 RUBBER LOOP16TO 20LONG 1/16 SHEET lBS R 1/2 DIHEDRAL / / 1/16x 1/8 IE 1/32 SHEET TABS COVER ALL SURFACES ONE SIDE WITH LIGHT TISSUE DO NOT WATER SHRINK OR DOPE 7/ 3/32 X 3/16 MOTOR STICK 1/18 SQ __ 56 Model Aviation II N 1/l5xVs TEI /V16 / / 1/8 DIHEDRAL I/ FORM BLADES ROUNDED 1/8 SQOVER COFFEE BALSA HUBCAN 4 FU50 AT IHlS LINE1/32 SHEET BLADES LEFT HAND PROP 2 1/2 DOWN 40 LEFT THRUST August1982 57 CG Built-Up Lighter Fragile Work Higher Performance / CA// 1fIr1rLight Tissue Coveringone both sides Light Simple All-Balsa Frameworkall surfaces Wooden Gear Balsa Wheels Balsa Prop Figure 4Holding Minor dowel rear peg Make slot Balsaleast 4- wide nose plug Laminated balsa nose block water-shrink dope lightweight modelsl Magic Markers thinly-sprayed model enamel OK color trim fact have built flown very few canards Eventually proper CG location found combined what seemed excessive amount angular difference between wing forward canard surface fairly large amount upthrust equivalent downthrust tractor configuration also found necessary adjustments Shinden demon strated exceptional flight performance sta bility lighter profile model built also larger built-up Rubber Scale model using same force arrangements original profile Lo behold built-in adjustments worked exactly profile very minor trimming required get both flying well Several other similar experiences have con vinced small profile models indeed provide accurate insight flight characteristics trim requirements larger built-up model Its simple fun way save time frustration take surprises out trimming large new beautiful Scale project might also steer away real dogs worth effort fight through flight trimming stages may have trimmed Free Flight Scale models before some procedures have found work pretty well certainly other ways go about trimming model tech niques may worth try start very easy profile model CG wing/stab angles idea determine combination C G wing tail angular difference provides just enough pitch up down stability dont want too much pitch stability will add unnecessary drag certainly cant get too little model wont fly general further forward CG greater stabilityand vice versa see Fig 1 want find point pitch stability disappears marginal move CG forward just little until adequate stability reappears First make absolutely sure flying surfaces straight free warps before testing Its surprising modelers experienced ones sometimes skip step After have determined surfaces true use modeling clay place CG point think should little rearward Keep rear hook prop bearing hole least 3116 V4 away motor stick rubber clearance 58 Model Aviation Figure 3Basic Consi Sturdy Simple S06 Plastic Prop ng sheet fuselage Hole Fuselage Motor Stick Motor stick Lightweight built-up fuselage thin sheet balsa Motor Tube fuselage builtMotor tube made 1164 1/32 sheet balsa rolled around dowel glued also can formed several layers tracing paper glued together Make tube di ameter least % Actually almost place between wing leading trailing edges will starter doubt place CG point one-third distance leading trailing edge Mark C G soft pencil can keep track have tested first tests somewhat easier remove propeller replace piece modeling clay equal weight models glide will better propeller changes want observe will easier see Leave prop isnt easy remove either put few turns rubber motor let free-wheel dont want thrust just want reduce drag prop during gliding tests first step gently glide model very few turns motor observe flight path During phase adjust elevator until get smooth descending glide Several glides trim setting will necessary make sure okay glide reasonably smooth continue Balance trim adjustments weird configurations like Blohm Voas BV141 ideal problema solving simple profiles felt-tip pen can wonders detailing otherwise plain all-sheet model mini Focke-Wuif Stosser shows benefits gliding model increasing speed until tossing harder ever would normal launch model tends zoom upward sharply loop too stable tends tuck nose under dive toward ground increased speeds unstable some quirk fate model continues shallow climb glides smoothly has small margin stability can proceed power tests Assuming model either zoomed upward dove ground move CG about ng modeling clay nose tail follows Move C G rearward clay tail bend elevator trailing edge down bit model zoomed upward Move CG forward clay nose bend elevator trailing edge up bit model dove After making C G incidence adjustments go back gentle launches Adjust elevator get smooth glide Repeat steps until have found CG remember marked time incidence combinations stable unstable use powered tests come next will just little forward marginally-stable point Table Fig 2 summarize process much clearly words Thrust line next step find proper thrust line angles Put very small amount rudder adjustment direction want flight path certain models clay weight wing tip works better rudder turn usually use left turn both power glide Once CG has established glide tests simply begin add more turns power flight tests proceed time use thrust angle changes get good power pattern adjustments pretty obvious cases point thrust line downward keep model zooming upward under first burst power point opposite direction Continued ~agc 143 August 1982 59 Rolfe Gregorys profile Wildcat simple impressive InuourImler Profiles easy build lots fun WW II airplanes like Hellcat tine tljers no LG clean lines have good duration help teach low-wing trimming sure etching well done slightest film copper will serve conductor high voltages resulting failure op-amp other high-voltage-sensitive parts Leads may pass using Teflon tubes 001 uF capacitors lead ground inside case ground RF needed external leads including trigger wires diodes around op-amp protect stray voltages lost two op-amps before diodes installed Herb WahI Hurleman-type plug has used over 50 hours great success low power engine relation cooling area 27 hours rich running made plug bit black still firing experimenting type spark system interests start coil can wind good coil rest relatively easy Good luck 15 mil wire will need Profiles/SruII Continued page 59 turn becomes too tight etc Use very small thrust changes degree two time since effect large under full power Dihedral angle tail area model cant made fly consistent circle either direction tightening its turn eventu ally diving probably have spiral stability problems especially common lowwing models little dihedral also appears some parasol configurations large vertical tail surfaces such Curtiss Junior case best remedy usually add dihedral abut two three degrees timeuntil problem subsides Another possible solution reduce vertical tail surface usually looks bad can also lead other stability problems Another tricky method worth try certain models add vertical side area above approximate CG position Walt Mooney sometimes does filling open cabane structure like Curtiss Junior has clear sheet thin plastic can hardly see it will sometimes trick another Walts models added large profile pilot figure otherwise empty cockpit added enough lateral area above CG low-wing model fly properly no dihedral Another problem occurs occasionally directional instability case model will tend wander direction somewhat will impossible adjust reliable turn pattern Unlike spiral stability problem men tioned above however model will tend spin fact directional wandering usually means model spirally stable simple cure difficulty increase vertical tail area find need large amount increase would spoil looks Scale creation can borrow another idea Walt Mooney add transparent tab vertical tail flight will hardly visible trying set CG incidence described earlier models flight path erratic pitch difficult get repeat able results horizontal tail surfaces may too small Add 20 30% horizontal tail area try again tinned page 144 COMPLETE THIS FOAM AND ATTACH MAILING LABEL FROM RECE NT E LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US Possessions elsewhere Including Canada MexIco $2400 US Schools $gOO US Libraries $1350 NAME ADDRESS CITY/STATE _____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW WASHINGTON DC 20005 August1982 143 distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER II INC 16650 South 104th AVENUE ORLANO PARK ILLINOIS 60462 soon bringing result years military research testing Watch Full Command Systems 908 E Rosewood Spokane WA 99207 509 487-2112 Other peculiar trimming problems may arise weird scale configurations can cutand-try solve little profile test machine problems discussed above ever tend common ones Scale models Construction methods case want try hand constructing profile model favorite airplane few design building tips observed published models models of local flying comrades two basic structural approaches allsheet surfaces built-up tissue-covered sur faces see Fig 3 built-up tissue-covered models can built lighter all-sheet models fore have potentially higher flight perform ance usually used profiles intended primarily Indoor flying bit time consuming build although very simple tend somewhat fragile solid sheet counterparts All-sheet models usually built thin 1/16 1/64 sheet balsa although local club members have using thin sheet foam plastic 1/32 3/32 thickness sheet plastic sliced large blocks dense blue-colored foamthe kind often used building insulation some areas foam material extremely easy use profile models believe partly respon sible popularity profiles club foam lighter balsa much less expensive As added bonus virtually warp-proof Flying outdoors damp grass cool damp evenings can quickly turn conven tional balsa-and-tissue models useless pret zels unless lots dope other moisture Tired stamped sheet-metal flat glow plug wrenches find 4way cast-metal ones clumsy use Bee Twister answertO prayers handle carefully shaped com fortable fit hand design makes easy reach plug buried deep inside cowling compact tool fits easily field box wrench designed fit popular glow plugs including GbBees its attractive plastic handle proudly displays Gb Bee logo shaft steel Get local hobby shop product review product review product review 144 Model Aviation product review product review product review Shape Things Come Technology-2000 D Designed Full Command Systems Canadian governments target drone program Full Command has now brought cutting edge Radio Control Technology hobbiest shaped like Old Fashioned radios Full iand Systems will Bee Twister glow plug wrench No 4228 $300 GloBee Division Twinn-K Inc PO Box 31 228 India napolis IN 46231 4E*SE5a KITS 1/4 SCALE SEMI KIT13900 1/4 SCALE COMPLETE KIT. 19900 1/3 SCALE SEMI KIT16900 1/3 SCALE COMPLETE KIT.22900 PLEASE ADD $750 FOR SHIPPING i/4 3CALE SPAN 80 WEIGHT 201 ENGINE QUADRA 1/3 SCALE SPAN 106 WEIGHT 781 ENGINE QUADRA SEMI 51113 CONTAIN SAWED AND SANDED FORNERS WALL WING RIBS TIPS RUDDER AND STAB OUTLINED SIZE PLAPS CPLETE KItS CONTAIN THE ADOYR PARTS ALL PINE AND BALSA STRIP WOOD WARE SEND *1 00 FOR OUR OWIPLETE CATALOG PHDNE 1419 599-2121 proofer has used case all-sheet profile models very simple build can easily decorated felt-tip pens excellent projects begin ners just getting powered Free Flight models Holding motor prop Fig 4 shows three basic ways support rubber motor model 1 hole fuselage 2 motor stick 3 motor tube classic most-used scheme hole fuselage method best suited forthe all-sheet balsa model fuselage rigid enough support fully wound motor weaker construction used such very thin sheet balsa foam built-up structure motor stick motor tube will required support pull fully wound motor motor stick can simple piece 3/32 3/16 balsa very lightweight models can small rolled tube 1/32 1/64 balsa Ia Indoor practice rubber motor also can fully enclosed fairly large diameter tube built part fuselage Such motor tube should least -in diameter provide sutlicient clear ance unwinding rubber motor tube can made wrapping 1/32 1/64 balsa several layers paper around dowel Attaching prop Fig 5 shows different types prop bearings used motor sticks Remember trying new novel design allowance should made easy thrust-line adjustments fixed thrust bearings have cut off re-glued time thrust line changed sample proflle design build would like try practice profile model full-size plans provided 6-in-span version experimental Japanese Navy fighter Kyushu Shinden Construction built-up tissuecovered variety plans indicate CG. incidence thrust adjustments have worked models Flights over two minutes possible little bird Give try see can find other better trim settings Best luck new flight test tools FF Duration/Meuser Continued page 67 note Bill Bogart seems friend Bills dredged up report written Seredinsky both friend Seredinsky work ing Grumman So far have title page interior page Bill thought might find interesting shows airfoil cross sections labeled Modifications Airfoil Se 4410 first four sections original 1% LE radius modified version 3% nose radius turbulator wire ahead foil apparently something like sand stuck top surface over first 20% chord Number five now-familiar flamingo foil Also shown CL-vs-CD polars five sections derived model flight tests Reynolds-number range 45 000 tO 30000 Thtts live curves seem little /on smooth no experimental points arc shown makes feel little uneasy nevertheless. Worst hunch wis 3%-nose oh Ahie leg upwas un-modded Se 4410 1% nose came sandy surface mod original foil turbulator % diameter situated 7% ahead L E roughly 1% above bottom-surface chord line Best bunch flamingo its Hobby Shack RADIO RIOT BA 6 channel w/4 Ca 5-26 ser vos tull Ni Cd & char9er z9$16995 LIST $30995 5 channel w/4 ea S-26 ser vos dual rates full Ni-Cd LIST $27995 $15499 6 channel w/2dual rates 6 servos reversing switches 1ST $34995 U name3 U address cityU U statezip3 U mail order catalogs 18480 BANDILIER CIRCLE U FOUNTAIN VALLEY CA 928708 POSTAGE AND HANDLING CHARGES 3 $000 $2500 add $300 $2501 $5000 add $400 U Over $5000 add $500 California residents add 6% state sales tax mminmin August1982 145 kYShaCI CIRRUS I850 XLC system w/4 Lw OEft6N 649 APPIAN NAPOLEON OHIO 43545
Edition: Model Aviation - 1982/08
Page Numbers: 54, 55, 56, 57, 58, 59, 143, 144, 145
For Fun Test PROP IL IIODLS Thought simple rubber-powered profiles scale configurations justforfun did Youd surprised wealth informa tion author has learned models can applied fully developed detailed planes help assure flight sucess boot plans Kvushu Shinden profile EDon Srull RUBBER-POWERED profile models have around long time provide logical step young modelers ready gradu ate Hand-Launched Gliders stick models such famous AMA Cub excellent designs have appeared model press over years designers note publish numerous fine profile designs ol Scale author Mirage delta profile has 16 span produces 30 length long rubber motor plane required tandem counter-rotating props too much torque single prop short wingspan handle Two different profiles Japanese Shinden fighter aircraft lightweight version left full-size plans presented article proved design fine flier all-sheet version right bit heavier much sturdyfor outdoor use master Bill Hannan popularity profiles has enhanced considerably several fun-type competitive events offered Free Flight clubs example Flightmasters San Diego biteers DC Maxecuters Flying Aces Club sponsor profile events Scale Catapult Gliders Scale Rubber-Powered models Flying rather scale detail name game Another use skinny models also known No-Cals powered test vehicles new untried unconventional designs profile version new model design can very useful determining whether new design will suitable elegant model respect stability Perhaps important profile model can also help determine proper location center gravity CG necessary amount angular difference between wing stabilizer correct thrust angle minimum dihedral minimum stabilizer vertical fin sizes Thats bad small investment time materials eh results way just appropriate Rubber-Powered Scale models can also helpful powered Free Flight Scale Radio Control Scale models During recent years have built several dozen profile models both entry No-Cal contests test beds unusual Scale model config urations Delta wings flying wings canards pushers tandem twin-engine configurations have tried club members has built mastered unusual Blohm Voss asymmetrical configuration could have done fully built-up models aircraft course tremendous vestment time goodness knows much cussing profile test models inding1 possible determine fair accuracy what design deviations true scale necessary what complete trim arrangements produced good stable flight perform ance case flying wing design shall remain nameless found basic configuration real turkey darn thing problems way imaginableand some werent saved lot further wasted time frustration particular subject plus side particularly good luck profile model tests twin-engined pushpull Dornier Do335 Its potential seemed much better imagined put together larger built-up Rubber model Dornier subsequently -in RC Scale model same bird profile model pro vided good estimates wing/stab angular difference thrust angles dihedral requirements larger Rubber model As result very minor adjustments changes required after larger model built RC project similarly benefited also got lot useful information out canard profile model Japanese Navy ex perimental fighter Kyushu Shinden original model proved rather tricky adjust large part due no doubt August1982 55 V JN V /1 / / II II1 JAPANESE NAVY SHI NDEN 16 SPAN PROFILE 320t frail TRIM FOR RIGHT TURN POWER WITH 3/32 10 1/8 RUBBER LOOP16TO 20LONG 1/16 SHEET lBS R 1/2 DIHEDRAL / / 1/16x 1/8 IE 1/32 SHEET TABS COVER ALL SURFACES ONE SIDE WITH LIGHT TISSUE DO NOT WATER SHRINK OR DOPE 7/ 3/32 X 3/16 MOTOR STICK 1/18 SQ __ 56 Model Aviation II N 1/l5xVs TEI /V16 / / 1/8 DIHEDRAL I/ FORM BLADES ROUNDED 1/8 SQOVER COFFEE BALSA HUBCAN 4 FU50 AT IHlS LINE1/32 SHEET BLADES LEFT HAND PROP 2 1/2 DOWN 40 LEFT THRUST August1982 57 CG Built-Up Lighter Fragile Work Higher Performance / CA// 1fIr1rLight Tissue Coveringone both sides Light Simple All-Balsa Frameworkall surfaces Wooden Gear Balsa Wheels Balsa Prop Figure 4Holding Minor dowel rear peg Make slot Balsaleast 4- wide nose plug Laminated balsa nose block water-shrink dope lightweight modelsl Magic Markers thinly-sprayed model enamel OK color trim fact have built flown very few canards Eventually proper CG location found combined what seemed excessive amount angular difference between wing forward canard surface fairly large amount upthrust equivalent downthrust tractor configuration also found necessary adjustments Shinden demon strated exceptional flight performance sta bility lighter profile model built also larger built-up Rubber Scale model using same force arrangements original profile Lo behold built-in adjustments worked exactly profile very minor trimming required get both flying well Several other similar experiences have con vinced small profile models indeed provide accurate insight flight characteristics trim requirements larger built-up model Its simple fun way save time frustration take surprises out trimming large new beautiful Scale project might also steer away real dogs worth effort fight through flight trimming stages may have trimmed Free Flight Scale models before some procedures have found work pretty well certainly other ways go about trimming model tech niques may worth try start very easy profile model CG wing/stab angles idea determine combination C G wing tail angular difference provides just enough pitch up down stability dont want too much pitch stability will add unnecessary drag certainly cant get too little model wont fly general further forward CG greater stabilityand vice versa see Fig 1 want find point pitch stability disappears marginal move CG forward just little until adequate stability reappears First make absolutely sure flying surfaces straight free warps before testing Its surprising modelers experienced ones sometimes skip step After have determined surfaces true use modeling clay place CG point think should little rearward Keep rear hook prop bearing hole least 3116 V4 away motor stick rubber clearance 58 Model Aviation Figure 3Basic Consi Sturdy Simple S06 Plastic Prop ng sheet fuselage Hole Fuselage Motor Stick Motor stick Lightweight built-up fuselage thin sheet balsa Motor Tube fuselage builtMotor tube made 1164 1/32 sheet balsa rolled around dowel glued also can formed several layers tracing paper glued together Make tube di ameter least % Actually almost place between wing leading trailing edges will starter doubt place CG point one-third distance leading trailing edge Mark C G soft pencil can keep track have tested first tests somewhat easier remove propeller replace piece modeling clay equal weight models glide will better propeller changes want observe will easier see Leave prop isnt easy remove either put few turns rubber motor let free-wheel dont want thrust just want reduce drag prop during gliding tests first step gently glide model very few turns motor observe flight path During phase adjust elevator until get smooth descending glide Several glides trim setting will necessary make sure okay glide reasonably smooth continue Balance trim adjustments weird configurations like Blohm Voas BV141 ideal problema solving simple profiles felt-tip pen can wonders detailing otherwise plain all-sheet model mini Focke-Wuif Stosser shows benefits gliding model increasing speed until tossing harder ever would normal launch model tends zoom upward sharply loop too stable tends tuck nose under dive toward ground increased speeds unstable some quirk fate model continues shallow climb glides smoothly has small margin stability can proceed power tests Assuming model either zoomed upward dove ground move CG about ng modeling clay nose tail follows Move C G rearward clay tail bend elevator trailing edge down bit model zoomed upward Move CG forward clay nose bend elevator trailing edge up bit model dove After making C G incidence adjustments go back gentle launches Adjust elevator get smooth glide Repeat steps until have found CG remember marked time incidence combinations stable unstable use powered tests come next will just little forward marginally-stable point Table Fig 2 summarize process much clearly words Thrust line next step find proper thrust line angles Put very small amount rudder adjustment direction want flight path certain models clay weight wing tip works better rudder turn usually use left turn both power glide Once CG has established glide tests simply begin add more turns power flight tests proceed time use thrust angle changes get good power pattern adjustments pretty obvious cases point thrust line downward keep model zooming upward under first burst power point opposite direction Continued ~agc 143 August 1982 59 Rolfe Gregorys profile Wildcat simple impressive InuourImler Profiles easy build lots fun WW II airplanes like Hellcat tine tljers no LG clean lines have good duration help teach low-wing trimming sure etching well done slightest film copper will serve conductor high voltages resulting failure op-amp other high-voltage-sensitive parts Leads may pass using Teflon tubes 001 uF capacitors lead ground inside case ground RF needed external leads including trigger wires diodes around op-amp protect stray voltages lost two op-amps before diodes installed Herb WahI Hurleman-type plug has used over 50 hours great success low power engine relation cooling area 27 hours rich running made plug bit black still firing experimenting type spark system interests start coil can wind good coil rest relatively easy Good luck 15 mil wire will need Profiles/SruII Continued page 59 turn becomes too tight etc Use very small thrust changes degree two time since effect large under full power Dihedral angle tail area model cant made fly consistent circle either direction tightening its turn eventu ally diving probably have spiral stability problems especially common lowwing models little dihedral also appears some parasol configurations large vertical tail surfaces such Curtiss Junior case best remedy usually add dihedral abut two three degrees timeuntil problem subsides Another possible solution reduce vertical tail surface usually looks bad can also lead other stability problems Another tricky method worth try certain models add vertical side area above approximate CG position Walt Mooney sometimes does filling open cabane structure like Curtiss Junior has clear sheet thin plastic can hardly see it will sometimes trick another Walts models added large profile pilot figure otherwise empty cockpit added enough lateral area above CG low-wing model fly properly no dihedral Another problem occurs occasionally directional instability case model will tend wander direction somewhat will impossible adjust reliable turn pattern Unlike spiral stability problem men tioned above however model will tend spin fact directional wandering usually means model spirally stable simple cure difficulty increase vertical tail area find need large amount increase would spoil looks Scale creation can borrow another idea Walt Mooney add transparent tab vertical tail flight will hardly visible trying set CG incidence described earlier models flight path erratic pitch difficult get repeat able results horizontal tail surfaces may too small Add 20 30% horizontal tail area try again tinned page 144 COMPLETE THIS FOAM AND ATTACH MAILING LABEL FROM RECE NT E LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US Possessions elsewhere Including Canada MexIco $2400 US Schools $gOO US Libraries $1350 NAME ADDRESS CITY/STATE _____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW WASHINGTON DC 20005 August1982 143 distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER II INC 16650 South 104th AVENUE ORLANO PARK ILLINOIS 60462 soon bringing result years military research testing Watch Full Command Systems 908 E Rosewood Spokane WA 99207 509 487-2112 Other peculiar trimming problems may arise weird scale configurations can cutand-try solve little profile test machine problems discussed above ever tend common ones Scale models Construction methods case want try hand constructing profile model favorite airplane few design building tips observed published models models of local flying comrades two basic structural approaches allsheet surfaces built-up tissue-covered sur faces see Fig 3 built-up tissue-covered models can built lighter all-sheet models fore have potentially higher flight perform ance usually used profiles intended primarily Indoor flying bit time consuming build although very simple tend somewhat fragile solid sheet counterparts All-sheet models usually built thin 1/16 1/64 sheet balsa although local club members have using thin sheet foam plastic 1/32 3/32 thickness sheet plastic sliced large blocks dense blue-colored foamthe kind often used building insulation some areas foam material extremely easy use profile models believe partly respon sible popularity profiles club foam lighter balsa much less expensive As added bonus virtually warp-proof Flying outdoors damp grass cool damp evenings can quickly turn conven tional balsa-and-tissue models useless pret zels unless lots dope other moisture Tired stamped sheet-metal flat glow plug wrenches find 4way cast-metal ones clumsy use Bee Twister answertO prayers handle carefully shaped com fortable fit hand design makes easy reach plug buried deep inside cowling compact tool fits easily field box wrench designed fit popular glow plugs including GbBees its attractive plastic handle proudly displays Gb Bee logo shaft steel Get local hobby shop product review product review product review 144 Model Aviation product review product review product review Shape Things Come Technology-2000 D Designed Full Command Systems Canadian governments target drone program Full Command has now brought cutting edge Radio Control Technology hobbiest shaped like Old Fashioned radios Full iand Systems will Bee Twister glow plug wrench No 4228 $300 GloBee Division Twinn-K Inc PO Box 31 228 India napolis IN 46231 4E*SE5a KITS 1/4 SCALE SEMI KIT13900 1/4 SCALE COMPLETE KIT. 19900 1/3 SCALE SEMI KIT16900 1/3 SCALE COMPLETE KIT.22900 PLEASE ADD $750 FOR SHIPPING i/4 3CALE SPAN 80 WEIGHT 201 ENGINE QUADRA 1/3 SCALE SPAN 106 WEIGHT 781 ENGINE QUADRA SEMI 51113 CONTAIN SAWED AND SANDED FORNERS WALL WING RIBS TIPS RUDDER AND STAB OUTLINED SIZE PLAPS CPLETE KItS CONTAIN THE ADOYR PARTS ALL PINE AND BALSA STRIP WOOD WARE SEND *1 00 FOR OUR OWIPLETE CATALOG PHDNE 1419 599-2121 proofer has used case all-sheet profile models very simple build can easily decorated felt-tip pens excellent projects begin ners just getting powered Free Flight models Holding motor prop Fig 4 shows three basic ways support rubber motor model 1 hole fuselage 2 motor stick 3 motor tube classic most-used scheme hole fuselage method best suited forthe all-sheet balsa model fuselage rigid enough support fully wound motor weaker construction used such very thin sheet balsa foam built-up structure motor stick motor tube will required support pull fully wound motor motor stick can simple piece 3/32 3/16 balsa very lightweight models can small rolled tube 1/32 1/64 balsa Ia Indoor practice rubber motor also can fully enclosed fairly large diameter tube built part fuselage Such motor tube should least -in diameter provide sutlicient clear ance unwinding rubber motor tube can made wrapping 1/32 1/64 balsa several layers paper around dowel Attaching prop Fig 5 shows different types prop bearings used motor sticks Remember trying new novel design allowance should made easy thrust-line adjustments fixed thrust bearings have cut off re-glued time thrust line changed sample proflle design build would like try practice profile model full-size plans provided 6-in-span version experimental Japanese Navy fighter Kyushu Shinden Construction built-up tissuecovered variety plans indicate CG. incidence thrust adjustments have worked models Flights over two minutes possible little bird Give try see can find other better trim settings Best luck new flight test tools FF Duration/Meuser Continued page 67 note Bill Bogart seems friend Bills dredged up report written Seredinsky both friend Seredinsky work ing Grumman So far have title page interior page Bill thought might find interesting shows airfoil cross sections labeled Modifications Airfoil Se 4410 first four sections original 1% LE radius modified version 3% nose radius turbulator wire ahead foil apparently something like sand stuck top surface over first 20% chord Number five now-familiar flamingo foil Also shown CL-vs-CD polars five sections derived model flight tests Reynolds-number range 45 000 tO 30000 Thtts live curves seem little /on smooth no experimental points arc shown makes feel little uneasy nevertheless. Worst hunch wis 3%-nose oh Ahie leg upwas un-modded Se 4410 1% nose came sandy surface mod original foil turbulator % diameter situated 7% ahead L E roughly 1% above bottom-surface chord line Best bunch flamingo its Hobby Shack RADIO RIOT BA 6 channel w/4 Ca 5-26 ser vos tull Ni Cd & char9er z9$16995 LIST $30995 5 channel w/4 ea S-26 ser vos dual rates full Ni-Cd LIST $27995 $15499 6 channel w/2dual rates 6 servos reversing switches 1ST $34995 U name3 U address cityU U statezip3 U mail order catalogs 18480 BANDILIER CIRCLE U FOUNTAIN VALLEY CA 928708 POSTAGE AND HANDLING CHARGES 3 $000 $2500 add $300 $2501 $5000 add $400 U Over $5000 add $500 California residents add 6% state sales tax mminmin August1982 145 kYShaCI CIRRUS I850 XLC system w/4 Lw OEft6N 649 APPIAN NAPOLEON OHIO 43545
Edition: Model Aviation - 1982/08
Page Numbers: 54, 55, 56, 57, 58, 59, 143, 144, 145
For Fun Test PROP IL IIODLS Thought simple rubber-powered profiles scale configurations justforfun did Youd surprised wealth informa tion author has learned models can applied fully developed detailed planes help assure flight sucess boot plans Kvushu Shinden profile EDon Srull RUBBER-POWERED profile models have around long time provide logical step young modelers ready gradu ate Hand-Launched Gliders stick models such famous AMA Cub excellent designs have appeared model press over years designers note publish numerous fine profile designs ol Scale author Mirage delta profile has 16 span produces 30 length long rubber motor plane required tandem counter-rotating props too much torque single prop short wingspan handle Two different profiles Japanese Shinden fighter aircraft lightweight version left full-size plans presented article proved design fine flier all-sheet version right bit heavier much sturdyfor outdoor use master Bill Hannan popularity profiles has enhanced considerably several fun-type competitive events offered Free Flight clubs example Flightmasters San Diego biteers DC Maxecuters Flying Aces Club sponsor profile events Scale Catapult Gliders Scale Rubber-Powered models Flying rather scale detail name game Another use skinny models also known No-Cals powered test vehicles new untried unconventional designs profile version new model design can very useful determining whether new design will suitable elegant model respect stability Perhaps important profile model can also help determine proper location center gravity CG necessary amount angular difference between wing stabilizer correct thrust angle minimum dihedral minimum stabilizer vertical fin sizes Thats bad small investment time materials eh results way just appropriate Rubber-Powered Scale models can also helpful powered Free Flight Scale Radio Control Scale models During recent years have built several dozen profile models both entry No-Cal contests test beds unusual Scale model config urations Delta wings flying wings canards pushers tandem twin-engine configurations have tried club members has built mastered unusual Blohm Voss asymmetrical configuration could have done fully built-up models aircraft course tremendous vestment time goodness knows much cussing profile test models inding1 possible determine fair accuracy what design deviations true scale necessary what complete trim arrangements produced good stable flight perform ance case flying wing design shall remain nameless found basic configuration real turkey darn thing problems way imaginableand some werent saved lot further wasted time frustration particular subject plus side particularly good luck profile model tests twin-engined pushpull Dornier Do335 Its potential seemed much better imagined put together larger built-up Rubber model Dornier subsequently -in RC Scale model same bird profile model pro vided good estimates wing/stab angular difference thrust angles dihedral requirements larger Rubber model As result very minor adjustments changes required after larger model built RC project similarly benefited also got lot useful information out canard profile model Japanese Navy ex perimental fighter Kyushu Shinden original model proved rather tricky adjust large part due no doubt August1982 55 V JN V /1 / / II II1 JAPANESE NAVY SHI NDEN 16 SPAN PROFILE 320t frail TRIM FOR RIGHT TURN POWER WITH 3/32 10 1/8 RUBBER LOOP16TO 20LONG 1/16 SHEET lBS R 1/2 DIHEDRAL / / 1/16x 1/8 IE 1/32 SHEET TABS COVER ALL SURFACES ONE SIDE WITH LIGHT TISSUE DO NOT WATER SHRINK OR DOPE 7/ 3/32 X 3/16 MOTOR STICK 1/18 SQ __ 56 Model Aviation II N 1/l5xVs TEI /V16 / / 1/8 DIHEDRAL I/ FORM BLADES ROUNDED 1/8 SQOVER COFFEE BALSA HUBCAN 4 FU50 AT IHlS LINE1/32 SHEET BLADES LEFT HAND PROP 2 1/2 DOWN 40 LEFT THRUST August1982 57 CG Built-Up Lighter Fragile Work Higher Performance / CA// 1fIr1rLight Tissue Coveringone both sides Light Simple All-Balsa Frameworkall surfaces Wooden Gear Balsa Wheels Balsa Prop Figure 4Holding Minor dowel rear peg Make slot Balsaleast 4- wide nose plug Laminated balsa nose block water-shrink dope lightweight modelsl Magic Markers thinly-sprayed model enamel OK color trim fact have built flown very few canards Eventually proper CG location found combined what seemed excessive amount angular difference between wing forward canard surface fairly large amount upthrust equivalent downthrust tractor configuration also found necessary adjustments Shinden demon strated exceptional flight performance sta bility lighter profile model built also larger built-up Rubber Scale model using same force arrangements original profile Lo behold built-in adjustments worked exactly profile very minor trimming required get both flying well Several other similar experiences have con vinced small profile models indeed provide accurate insight flight characteristics trim requirements larger built-up model Its simple fun way save time frustration take surprises out trimming large new beautiful Scale project might also steer away real dogs worth effort fight through flight trimming stages may have trimmed Free Flight Scale models before some procedures have found work pretty well certainly other ways go about trimming model tech niques may worth try start very easy profile model CG wing/stab angles idea determine combination C G wing tail angular difference provides just enough pitch up down stability dont want too much pitch stability will add unnecessary drag certainly cant get too little model wont fly general further forward CG greater stabilityand vice versa see Fig 1 want find point pitch stability disappears marginal move CG forward just little until adequate stability reappears First make absolutely sure flying surfaces straight free warps before testing Its surprising modelers experienced ones sometimes skip step After have determined surfaces true use modeling clay place CG point think should little rearward Keep rear hook prop bearing hole least 3116 V4 away motor stick rubber clearance 58 Model Aviation Figure 3Basic Consi Sturdy Simple S06 Plastic Prop ng sheet fuselage Hole Fuselage Motor Stick Motor stick Lightweight built-up fuselage thin sheet balsa Motor Tube fuselage builtMotor tube made 1164 1/32 sheet balsa rolled around dowel glued also can formed several layers tracing paper glued together Make tube di ameter least % Actually almost place between wing leading trailing edges will starter doubt place CG point one-third distance leading trailing edge Mark C G soft pencil can keep track have tested first tests somewhat easier remove propeller replace piece modeling clay equal weight models glide will better propeller changes want observe will easier see Leave prop isnt easy remove either put few turns rubber motor let free-wheel dont want thrust just want reduce drag prop during gliding tests first step gently glide model very few turns motor observe flight path During phase adjust elevator until get smooth descending glide Several glides trim setting will necessary make sure okay glide reasonably smooth continue Balance trim adjustments weird configurations like Blohm Voas BV141 ideal problema solving simple profiles felt-tip pen can wonders detailing otherwise plain all-sheet model mini Focke-Wuif Stosser shows benefits gliding model increasing speed until tossing harder ever would normal launch model tends zoom upward sharply loop too stable tends tuck nose under dive toward ground increased speeds unstable some quirk fate model continues shallow climb glides smoothly has small margin stability can proceed power tests Assuming model either zoomed upward dove ground move CG about ng modeling clay nose tail follows Move C G rearward clay tail bend elevator trailing edge down bit model zoomed upward Move CG forward clay nose bend elevator trailing edge up bit model dove After making C G incidence adjustments go back gentle launches Adjust elevator get smooth glide Repeat steps until have found CG remember marked time incidence combinations stable unstable use powered tests come next will just little forward marginally-stable point Table Fig 2 summarize process much clearly words Thrust line next step find proper thrust line angles Put very small amount rudder adjustment direction want flight path certain models clay weight wing tip works better rudder turn usually use left turn both power glide Once CG has established glide tests simply begin add more turns power flight tests proceed time use thrust angle changes get good power pattern adjustments pretty obvious cases point thrust line downward keep model zooming upward under first burst power point opposite direction Continued ~agc 143 August 1982 59 Rolfe Gregorys profile Wildcat simple impressive InuourImler Profiles easy build lots fun WW II airplanes like Hellcat tine tljers no LG clean lines have good duration help teach low-wing trimming sure etching well done slightest film copper will serve conductor high voltages resulting failure op-amp other high-voltage-sensitive parts Leads may pass using Teflon tubes 001 uF capacitors lead ground inside case ground RF needed external leads including trigger wires diodes around op-amp protect stray voltages lost two op-amps before diodes installed Herb WahI Hurleman-type plug has used over 50 hours great success low power engine relation cooling area 27 hours rich running made plug bit black still firing experimenting type spark system interests start coil can wind good coil rest relatively easy Good luck 15 mil wire will need Profiles/SruII Continued page 59 turn becomes too tight etc Use very small thrust changes degree two time since effect large under full power Dihedral angle tail area model cant made fly consistent circle either direction tightening its turn eventu ally diving probably have spiral stability problems especially common lowwing models little dihedral also appears some parasol configurations large vertical tail surfaces such Curtiss Junior case best remedy usually add dihedral abut two three degrees timeuntil problem subsides Another possible solution reduce vertical tail surface usually looks bad can also lead other stability problems Another tricky method worth try certain models add vertical side area above approximate CG position Walt Mooney sometimes does filling open cabane structure like Curtiss Junior has clear sheet thin plastic can hardly see it will sometimes trick another Walts models added large profile pilot figure otherwise empty cockpit added enough lateral area above CG low-wing model fly properly no dihedral Another problem occurs occasionally directional instability case model will tend wander direction somewhat will impossible adjust reliable turn pattern Unlike spiral stability problem men tioned above however model will tend spin fact directional wandering usually means model spirally stable simple cure difficulty increase vertical tail area find need large amount increase would spoil looks Scale creation can borrow another idea Walt Mooney add transparent tab vertical tail flight will hardly visible trying set CG incidence described earlier models flight path erratic pitch difficult get repeat able results horizontal tail surfaces may too small Add 20 30% horizontal tail area try again tinned page 144 COMPLETE THIS FOAM AND ATTACH MAILING LABEL FROM RECE NT E LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US Possessions elsewhere Including Canada MexIco $2400 US Schools $gOO US Libraries $1350 NAME ADDRESS CITY/STATE _____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW WASHINGTON DC 20005 August1982 143 distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER II INC 16650 South 104th AVENUE ORLANO PARK ILLINOIS 60462 soon bringing result years military research testing Watch Full Command Systems 908 E Rosewood Spokane WA 99207 509 487-2112 Other peculiar trimming problems may arise weird scale configurations can cutand-try solve little profile test machine problems discussed above ever tend common ones Scale models Construction methods case want try hand constructing profile model favorite airplane few design building tips observed published models models of local flying comrades two basic structural approaches allsheet surfaces built-up tissue-covered sur faces see Fig 3 built-up tissue-covered models can built lighter all-sheet models fore have potentially higher flight perform ance usually used profiles intended primarily Indoor flying bit time consuming build although very simple tend somewhat fragile solid sheet counterparts All-sheet models usually built thin 1/16 1/64 sheet balsa although local club members have using thin sheet foam plastic 1/32 3/32 thickness sheet plastic sliced large blocks dense blue-colored foamthe kind often used building insulation some areas foam material extremely easy use profile models believe partly respon sible popularity profiles club foam lighter balsa much less expensive As added bonus virtually warp-proof Flying outdoors damp grass cool damp evenings can quickly turn conven tional balsa-and-tissue models useless pret zels unless lots dope other moisture Tired stamped sheet-metal flat glow plug wrenches find 4way cast-metal ones clumsy use Bee Twister answertO prayers handle carefully shaped com fortable fit hand design makes easy reach plug buried deep inside cowling compact tool fits easily field box wrench designed fit popular glow plugs including GbBees its attractive plastic handle proudly displays Gb Bee logo shaft steel Get local hobby shop product review product review product review 144 Model Aviation product review product review product review Shape Things Come Technology-2000 D Designed Full Command Systems Canadian governments target drone program Full Command has now brought cutting edge Radio Control Technology hobbiest shaped like Old Fashioned radios Full iand Systems will Bee Twister glow plug wrench No 4228 $300 GloBee Division Twinn-K Inc PO Box 31 228 India napolis IN 46231 4E*SE5a KITS 1/4 SCALE SEMI KIT13900 1/4 SCALE COMPLETE KIT. 19900 1/3 SCALE SEMI KIT16900 1/3 SCALE COMPLETE KIT.22900 PLEASE ADD $750 FOR SHIPPING i/4 3CALE SPAN 80 WEIGHT 201 ENGINE QUADRA 1/3 SCALE SPAN 106 WEIGHT 781 ENGINE QUADRA SEMI 51113 CONTAIN SAWED AND SANDED FORNERS WALL WING RIBS TIPS RUDDER AND STAB OUTLINED SIZE PLAPS CPLETE KItS CONTAIN THE ADOYR PARTS ALL PINE AND BALSA STRIP WOOD WARE SEND *1 00 FOR OUR OWIPLETE CATALOG PHDNE 1419 599-2121 proofer has used case all-sheet profile models very simple build can easily decorated felt-tip pens excellent projects begin ners just getting powered Free Flight models Holding motor prop Fig 4 shows three basic ways support rubber motor model 1 hole fuselage 2 motor stick 3 motor tube classic most-used scheme hole fuselage method best suited forthe all-sheet balsa model fuselage rigid enough support fully wound motor weaker construction used such very thin sheet balsa foam built-up structure motor stick motor tube will required support pull fully wound motor motor stick can simple piece 3/32 3/16 balsa very lightweight models can small rolled tube 1/32 1/64 balsa Ia Indoor practice rubber motor also can fully enclosed fairly large diameter tube built part fuselage Such motor tube should least -in diameter provide sutlicient clear ance unwinding rubber motor tube can made wrapping 1/32 1/64 balsa several layers paper around dowel Attaching prop Fig 5 shows different types prop bearings used motor sticks Remember trying new novel design allowance should made easy thrust-line adjustments fixed thrust bearings have cut off re-glued time thrust line changed sample proflle design build would like try practice profile model full-size plans provided 6-in-span version experimental Japanese Navy fighter Kyushu Shinden Construction built-up tissuecovered variety plans indicate CG. incidence thrust adjustments have worked models Flights over two minutes possible little bird Give try see can find other better trim settings Best luck new flight test tools FF Duration/Meuser Continued page 67 note Bill Bogart seems friend Bills dredged up report written Seredinsky both friend Seredinsky work ing Grumman So far have title page interior page Bill thought might find interesting shows airfoil cross sections labeled Modifications Airfoil Se 4410 first four sections original 1% LE radius modified version 3% nose radius turbulator wire ahead foil apparently something like sand stuck top surface over first 20% chord Number five now-familiar flamingo foil Also shown CL-vs-CD polars five sections derived model flight tests Reynolds-number range 45 000 tO 30000 Thtts live curves seem little /on smooth no experimental points arc shown makes feel little uneasy nevertheless. Worst hunch wis 3%-nose oh Ahie leg upwas un-modded Se 4410 1% nose came sandy surface mod original foil turbulator % diameter situated 7% ahead L E roughly 1% above bottom-surface chord line Best bunch flamingo its Hobby Shack RADIO RIOT BA 6 channel w/4 Ca 5-26 ser vos tull Ni Cd & char9er z9$16995 LIST $30995 5 channel w/4 ea S-26 ser vos dual rates full Ni-Cd LIST $27995 $15499 6 channel w/2dual rates 6 servos reversing switches 1ST $34995 U name3 U address cityU U statezip3 U mail order catalogs 18480 BANDILIER CIRCLE U FOUNTAIN VALLEY CA 928708 POSTAGE AND HANDLING CHARGES 3 $000 $2500 add $300 $2501 $5000 add $400 U Over $5000 add $500 California residents add 6% state sales tax mminmin August1982 145 kYShaCI CIRRUS I850 XLC system w/4 Lw OEft6N 649 APPIAN NAPOLEON OHIO 43545
Edition: Model Aviation - 1982/08
Page Numbers: 54, 55, 56, 57, 58, 59, 143, 144, 145
For Fun Test PROP IL IIODLS Thought simple rubber-powered profiles scale configurations justforfun did Youd surprised wealth informa tion author has learned models can applied fully developed detailed planes help assure flight sucess boot plans Kvushu Shinden profile EDon Srull RUBBER-POWERED profile models have around long time provide logical step young modelers ready gradu ate Hand-Launched Gliders stick models such famous AMA Cub excellent designs have appeared model press over years designers note publish numerous fine profile designs ol Scale author Mirage delta profile has 16 span produces 30 length long rubber motor plane required tandem counter-rotating props too much torque single prop short wingspan handle Two different profiles Japanese Shinden fighter aircraft lightweight version left full-size plans presented article proved design fine flier all-sheet version right bit heavier much sturdyfor outdoor use master Bill Hannan popularity profiles has enhanced considerably several fun-type competitive events offered Free Flight clubs example Flightmasters San Diego biteers DC Maxecuters Flying Aces Club sponsor profile events Scale Catapult Gliders Scale Rubber-Powered models Flying rather scale detail name game Another use skinny models also known No-Cals powered test vehicles new untried unconventional designs profile version new model design can very useful determining whether new design will suitable elegant model respect stability Perhaps important profile model can also help determine proper location center gravity CG necessary amount angular difference between wing stabilizer correct thrust angle minimum dihedral minimum stabilizer vertical fin sizes Thats bad small investment time materials eh results way just appropriate Rubber-Powered Scale models can also helpful powered Free Flight Scale Radio Control Scale models During recent years have built several dozen profile models both entry No-Cal contests test beds unusual Scale model config urations Delta wings flying wings canards pushers tandem twin-engine configurations have tried club members has built mastered unusual Blohm Voss asymmetrical configuration could have done fully built-up models aircraft course tremendous vestment time goodness knows much cussing profile test models inding1 possible determine fair accuracy what design deviations true scale necessary what complete trim arrangements produced good stable flight perform ance case flying wing design shall remain nameless found basic configuration real turkey darn thing problems way imaginableand some werent saved lot further wasted time frustration particular subject plus side particularly good luck profile model tests twin-engined pushpull Dornier Do335 Its potential seemed much better imagined put together larger built-up Rubber model Dornier subsequently -in RC Scale model same bird profile model pro vided good estimates wing/stab angular difference thrust angles dihedral requirements larger Rubber model As result very minor adjustments changes required after larger model built RC project similarly benefited also got lot useful information out canard profile model Japanese Navy ex perimental fighter Kyushu Shinden original model proved rather tricky adjust large part due no doubt August1982 55 V JN V /1 / / II II1 JAPANESE NAVY SHI NDEN 16 SPAN PROFILE 320t frail TRIM FOR RIGHT TURN POWER WITH 3/32 10 1/8 RUBBER LOOP16TO 20LONG 1/16 SHEET lBS R 1/2 DIHEDRAL / / 1/16x 1/8 IE 1/32 SHEET TABS COVER ALL SURFACES ONE SIDE WITH LIGHT TISSUE DO NOT WATER SHRINK OR DOPE 7/ 3/32 X 3/16 MOTOR STICK 1/18 SQ __ 56 Model Aviation II N 1/l5xVs TEI /V16 / / 1/8 DIHEDRAL I/ FORM BLADES ROUNDED 1/8 SQOVER COFFEE BALSA HUBCAN 4 FU50 AT IHlS LINE1/32 SHEET BLADES LEFT HAND PROP 2 1/2 DOWN 40 LEFT THRUST August1982 57 CG Built-Up Lighter Fragile Work Higher Performance / CA// 1fIr1rLight Tissue Coveringone both sides Light Simple All-Balsa Frameworkall surfaces Wooden Gear Balsa Wheels Balsa Prop Figure 4Holding Minor dowel rear peg Make slot Balsaleast 4- wide nose plug Laminated balsa nose block water-shrink dope lightweight modelsl Magic Markers thinly-sprayed model enamel OK color trim fact have built flown very few canards Eventually proper CG location found combined what seemed excessive amount angular difference between wing forward canard surface fairly large amount upthrust equivalent downthrust tractor configuration also found necessary adjustments Shinden demon strated exceptional flight performance sta bility lighter profile model built also larger built-up Rubber Scale model using same force arrangements original profile Lo behold built-in adjustments worked exactly profile very minor trimming required get both flying well Several other similar experiences have con vinced small profile models indeed provide accurate insight flight characteristics trim requirements larger built-up model Its simple fun way save time frustration take surprises out trimming large new beautiful Scale project might also steer away real dogs worth effort fight through flight trimming stages may have trimmed Free Flight Scale models before some procedures have found work pretty well certainly other ways go about trimming model tech niques may worth try start very easy profile model CG wing/stab angles idea determine combination C G wing tail angular difference provides just enough pitch up down stability dont want too much pitch stability will add unnecessary drag certainly cant get too little model wont fly general further forward CG greater stabilityand vice versa see Fig 1 want find point pitch stability disappears marginal move CG forward just little until adequate stability reappears First make absolutely sure flying surfaces straight free warps before testing Its surprising modelers experienced ones sometimes skip step After have determined surfaces true use modeling clay place CG point think should little rearward Keep rear hook prop bearing hole least 3116 V4 away motor stick rubber clearance 58 Model Aviation Figure 3Basic Consi Sturdy Simple S06 Plastic Prop ng sheet fuselage Hole Fuselage Motor Stick Motor stick Lightweight built-up fuselage thin sheet balsa Motor Tube fuselage builtMotor tube made 1164 1/32 sheet balsa rolled around dowel glued also can formed several layers tracing paper glued together Make tube di ameter least % Actually almost place between wing leading trailing edges will starter doubt place CG point one-third distance leading trailing edge Mark C G soft pencil can keep track have tested first tests somewhat easier remove propeller replace piece modeling clay equal weight models glide will better propeller changes want observe will easier see Leave prop isnt easy remove either put few turns rubber motor let free-wheel dont want thrust just want reduce drag prop during gliding tests first step gently glide model very few turns motor observe flight path During phase adjust elevator until get smooth descending glide Several glides trim setting will necessary make sure okay glide reasonably smooth continue Balance trim adjustments weird configurations like Blohm Voas BV141 ideal problema solving simple profiles felt-tip pen can wonders detailing otherwise plain all-sheet model mini Focke-Wuif Stosser shows benefits gliding model increasing speed until tossing harder ever would normal launch model tends zoom upward sharply loop too stable tends tuck nose under dive toward ground increased speeds unstable some quirk fate model continues shallow climb glides smoothly has small margin stability can proceed power tests Assuming model either zoomed upward dove ground move CG about ng modeling clay nose tail follows Move C G rearward clay tail bend elevator trailing edge down bit model zoomed upward Move CG forward clay nose bend elevator trailing edge up bit model dove After making C G incidence adjustments go back gentle launches Adjust elevator get smooth glide Repeat steps until have found CG remember marked time incidence combinations stable unstable use powered tests come next will just little forward marginally-stable point Table Fig 2 summarize process much clearly words Thrust line next step find proper thrust line angles Put very small amount rudder adjustment direction want flight path certain models clay weight wing tip works better rudder turn usually use left turn both power glide Once CG has established glide tests simply begin add more turns power flight tests proceed time use thrust angle changes get good power pattern adjustments pretty obvious cases point thrust line downward keep model zooming upward under first burst power point opposite direction Continued ~agc 143 August 1982 59 Rolfe Gregorys profile Wildcat simple impressive InuourImler Profiles easy build lots fun WW II airplanes like Hellcat tine tljers no LG clean lines have good duration help teach low-wing trimming sure etching well done slightest film copper will serve conductor high voltages resulting failure op-amp other high-voltage-sensitive parts Leads may pass using Teflon tubes 001 uF capacitors lead ground inside case ground RF needed external leads including trigger wires diodes around op-amp protect stray voltages lost two op-amps before diodes installed Herb WahI Hurleman-type plug has used over 50 hours great success low power engine relation cooling area 27 hours rich running made plug bit black still firing experimenting type spark system interests start coil can wind good coil rest relatively easy Good luck 15 mil wire will need Profiles/SruII Continued page 59 turn becomes too tight etc Use very small thrust changes degree two time since effect large under full power Dihedral angle tail area model cant made fly consistent circle either direction tightening its turn eventu ally diving probably have spiral stability problems especially common lowwing models little dihedral also appears some parasol configurations large vertical tail surfaces such Curtiss Junior case best remedy usually add dihedral abut two three degrees timeuntil problem subsides Another possible solution reduce vertical tail surface usually looks bad can also lead other stability problems Another tricky method worth try certain models add vertical side area above approximate CG position Walt Mooney sometimes does filling open cabane structure like Curtiss Junior has clear sheet thin plastic can hardly see it will sometimes trick another Walts models added large profile pilot figure otherwise empty cockpit added enough lateral area above CG low-wing model fly properly no dihedral Another problem occurs occasionally directional instability case model will tend wander direction somewhat will impossible adjust reliable turn pattern Unlike spiral stability problem men tioned above however model will tend spin fact directional wandering usually means model spirally stable simple cure difficulty increase vertical tail area find need large amount increase would spoil looks Scale creation can borrow another idea Walt Mooney add transparent tab vertical tail flight will hardly visible trying set CG incidence described earlier models flight path erratic pitch difficult get repeat able results horizontal tail surfaces may too small Add 20 30% horizontal tail area try again tinned page 144 COMPLETE THIS FOAM AND ATTACH MAILING LABEL FROM RECE NT E LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US Possessions elsewhere Including Canada MexIco $2400 US Schools $gOO US Libraries $1350 NAME ADDRESS CITY/STATE _____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW WASHINGTON DC 20005 August1982 143 distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER II INC 16650 South 104th AVENUE ORLANO PARK ILLINOIS 60462 soon bringing result years military research testing Watch Full Command Systems 908 E Rosewood Spokane WA 99207 509 487-2112 Other peculiar trimming problems may arise weird scale configurations can cutand-try solve little profile test machine problems discussed above ever tend common ones Scale models Construction methods case want try hand constructing profile model favorite airplane few design building tips observed published models models of local flying comrades two basic structural approaches allsheet surfaces built-up tissue-covered sur faces see Fig 3 built-up tissue-covered models can built lighter all-sheet models fore have potentially higher flight perform ance usually used profiles intended primarily Indoor flying bit time consuming build although very simple tend somewhat fragile solid sheet counterparts All-sheet models usually built thin 1/16 1/64 sheet balsa although local club members have using thin sheet foam plastic 1/32 3/32 thickness sheet plastic sliced large blocks dense blue-colored foamthe kind often used building insulation some areas foam material extremely easy use profile models believe partly respon sible popularity profiles club foam lighter balsa much less expensive As added bonus virtually warp-proof Flying outdoors damp grass cool damp evenings can quickly turn conven tional balsa-and-tissue models useless pret zels unless lots dope other moisture Tired stamped sheet-metal flat glow plug wrenches find 4way cast-metal ones clumsy use Bee Twister answertO prayers handle carefully shaped com fortable fit hand design makes easy reach plug buried deep inside cowling compact tool fits easily field box wrench designed fit popular glow plugs including GbBees its attractive plastic handle proudly displays Gb Bee logo shaft steel Get local hobby shop product review product review product review 144 Model Aviation product review product review product review Shape Things Come Technology-2000 D Designed Full Command Systems Canadian governments target drone program Full Command has now brought cutting edge Radio Control Technology hobbiest shaped like Old Fashioned radios Full iand Systems will Bee Twister glow plug wrench No 4228 $300 GloBee Division Twinn-K Inc PO Box 31 228 India napolis IN 46231 4E*SE5a KITS 1/4 SCALE SEMI KIT13900 1/4 SCALE COMPLETE KIT. 19900 1/3 SCALE SEMI KIT16900 1/3 SCALE COMPLETE KIT.22900 PLEASE ADD $750 FOR SHIPPING i/4 3CALE SPAN 80 WEIGHT 201 ENGINE QUADRA 1/3 SCALE SPAN 106 WEIGHT 781 ENGINE QUADRA SEMI 51113 CONTAIN SAWED AND SANDED FORNERS WALL WING RIBS TIPS RUDDER AND STAB OUTLINED SIZE PLAPS CPLETE KItS CONTAIN THE ADOYR PARTS ALL PINE AND BALSA STRIP WOOD WARE SEND *1 00 FOR OUR OWIPLETE CATALOG PHDNE 1419 599-2121 proofer has used case all-sheet profile models very simple build can easily decorated felt-tip pens excellent projects begin ners just getting powered Free Flight models Holding motor prop Fig 4 shows three basic ways support rubber motor model 1 hole fuselage 2 motor stick 3 motor tube classic most-used scheme hole fuselage method best suited forthe all-sheet balsa model fuselage rigid enough support fully wound motor weaker construction used such very thin sheet balsa foam built-up structure motor stick motor tube will required support pull fully wound motor motor stick can simple piece 3/32 3/16 balsa very lightweight models can small rolled tube 1/32 1/64 balsa Ia Indoor practice rubber motor also can fully enclosed fairly large diameter tube built part fuselage Such motor tube should least -in diameter provide sutlicient clear ance unwinding rubber motor tube can made wrapping 1/32 1/64 balsa several layers paper around dowel Attaching prop Fig 5 shows different types prop bearings used motor sticks Remember trying new novel design allowance should made easy thrust-line adjustments fixed thrust bearings have cut off re-glued time thrust line changed sample proflle design build would like try practice profile model full-size plans provided 6-in-span version experimental Japanese Navy fighter Kyushu Shinden Construction built-up tissuecovered variety plans indicate CG. incidence thrust adjustments have worked models Flights over two minutes possible little bird Give try see can find other better trim settings Best luck new flight test tools FF Duration/Meuser Continued page 67 note Bill Bogart seems friend Bills dredged up report written Seredinsky both friend Seredinsky work ing Grumman So far have title page interior page Bill thought might find interesting shows airfoil cross sections labeled Modifications Airfoil Se 4410 first four sections original 1% LE radius modified version 3% nose radius turbulator wire ahead foil apparently something like sand stuck top surface over first 20% chord Number five now-familiar flamingo foil Also shown CL-vs-CD polars five sections derived model flight tests Reynolds-number range 45 000 tO 30000 Thtts live curves seem little /on smooth no experimental points arc shown makes feel little uneasy nevertheless. Worst hunch wis 3%-nose oh Ahie leg upwas un-modded Se 4410 1% nose came sandy surface mod original foil turbulator % diameter situated 7% ahead L E roughly 1% above bottom-surface chord line Best bunch flamingo its Hobby Shack RADIO RIOT BA 6 channel w/4 Ca 5-26 ser vos tull Ni Cd & char9er z9$16995 LIST $30995 5 channel w/4 ea S-26 ser vos dual rates full Ni-Cd LIST $27995 $15499 6 channel w/2dual rates 6 servos reversing switches 1ST $34995 U name3 U address cityU U statezip3 U mail order catalogs 18480 BANDILIER CIRCLE U FOUNTAIN VALLEY CA 928708 POSTAGE AND HANDLING CHARGES 3 $000 $2500 add $300 $2501 $5000 add $400 U Over $5000 add $500 California residents add 6% state sales tax mminmin August1982 145 kYShaCI CIRRUS I850 XLC system w/4 Lw OEft6N 649 APPIAN NAPOLEON OHIO 43545
Edition: Model Aviation - 1982/08
Page Numbers: 54, 55, 56, 57, 58, 59, 143, 144, 145
For Fun Test PROP IL IIODLS Thought simple rubber-powered profiles scale configurations justforfun did Youd surprised wealth informa tion author has learned models can applied fully developed detailed planes help assure flight sucess boot plans Kvushu Shinden profile EDon Srull RUBBER-POWERED profile models have around long time provide logical step young modelers ready gradu ate Hand-Launched Gliders stick models such famous AMA Cub excellent designs have appeared model press over years designers note publish numerous fine profile designs ol Scale author Mirage delta profile has 16 span produces 30 length long rubber motor plane required tandem counter-rotating props too much torque single prop short wingspan handle Two different profiles Japanese Shinden fighter aircraft lightweight version left full-size plans presented article proved design fine flier all-sheet version right bit heavier much sturdyfor outdoor use master Bill Hannan popularity profiles has enhanced considerably several fun-type competitive events offered Free Flight clubs example Flightmasters San Diego biteers DC Maxecuters Flying Aces Club sponsor profile events Scale Catapult Gliders Scale Rubber-Powered models Flying rather scale detail name game Another use skinny models also known No-Cals powered test vehicles new untried unconventional designs profile version new model design can very useful determining whether new design will suitable elegant model respect stability Perhaps important profile model can also help determine proper location center gravity CG necessary amount angular difference between wing stabilizer correct thrust angle minimum dihedral minimum stabilizer vertical fin sizes Thats bad small investment time materials eh results way just appropriate Rubber-Powered Scale models can also helpful powered Free Flight Scale Radio Control Scale models During recent years have built several dozen profile models both entry No-Cal contests test beds unusual Scale model config urations Delta wings flying wings canards pushers tandem twin-engine configurations have tried club members has built mastered unusual Blohm Voss asymmetrical configuration could have done fully built-up models aircraft course tremendous vestment time goodness knows much cussing profile test models inding1 possible determine fair accuracy what design deviations true scale necessary what complete trim arrangements produced good stable flight perform ance case flying wing design shall remain nameless found basic configuration real turkey darn thing problems way imaginableand some werent saved lot further wasted time frustration particular subject plus side particularly good luck profile model tests twin-engined pushpull Dornier Do335 Its potential seemed much better imagined put together larger built-up Rubber model Dornier subsequently -in RC Scale model same bird profile model pro vided good estimates wing/stab angular difference thrust angles dihedral requirements larger Rubber model As result very minor adjustments changes required after larger model built RC project similarly benefited also got lot useful information out canard profile model Japanese Navy ex perimental fighter Kyushu Shinden original model proved rather tricky adjust large part due no doubt August1982 55 V JN V /1 / / II II1 JAPANESE NAVY SHI NDEN 16 SPAN PROFILE 320t frail TRIM FOR RIGHT TURN POWER WITH 3/32 10 1/8 RUBBER LOOP16TO 20LONG 1/16 SHEET lBS R 1/2 DIHEDRAL / / 1/16x 1/8 IE 1/32 SHEET TABS COVER ALL SURFACES ONE SIDE WITH LIGHT TISSUE DO NOT WATER SHRINK OR DOPE 7/ 3/32 X 3/16 MOTOR STICK 1/18 SQ __ 56 Model Aviation II N 1/l5xVs TEI /V16 / / 1/8 DIHEDRAL I/ FORM BLADES ROUNDED 1/8 SQOVER COFFEE BALSA HUBCAN 4 FU50 AT IHlS LINE1/32 SHEET BLADES LEFT HAND PROP 2 1/2 DOWN 40 LEFT THRUST August1982 57 CG Built-Up Lighter Fragile Work Higher Performance / CA// 1fIr1rLight Tissue Coveringone both sides Light Simple All-Balsa Frameworkall surfaces Wooden Gear Balsa Wheels Balsa Prop Figure 4Holding Minor dowel rear peg Make slot Balsaleast 4- wide nose plug Laminated balsa nose block water-shrink dope lightweight modelsl Magic Markers thinly-sprayed model enamel OK color trim fact have built flown very few canards Eventually proper CG location found combined what seemed excessive amount angular difference between wing forward canard surface fairly large amount upthrust equivalent downthrust tractor configuration also found necessary adjustments Shinden demon strated exceptional flight performance sta bility lighter profile model built also larger built-up Rubber Scale model using same force arrangements original profile Lo behold built-in adjustments worked exactly profile very minor trimming required get both flying well Several other similar experiences have con vinced small profile models indeed provide accurate insight flight characteristics trim requirements larger built-up model Its simple fun way save time frustration take surprises out trimming large new beautiful Scale project might also steer away real dogs worth effort fight through flight trimming stages may have trimmed Free Flight Scale models before some procedures have found work pretty well certainly other ways go about trimming model tech niques may worth try start very easy profile model CG wing/stab angles idea determine combination C G wing tail angular difference provides just enough pitch up down stability dont want too much pitch stability will add unnecessary drag certainly cant get too little model wont fly general further forward CG greater stabilityand vice versa see Fig 1 want find point pitch stability disappears marginal move CG forward just little until adequate stability reappears First make absolutely sure flying surfaces straight free warps before testing Its surprising modelers experienced ones sometimes skip step After have determined surfaces true use modeling clay place CG point think should little rearward Keep rear hook prop bearing hole least 3116 V4 away motor stick rubber clearance 58 Model Aviation Figure 3Basic Consi Sturdy Simple S06 Plastic Prop ng sheet fuselage Hole Fuselage Motor Stick Motor stick Lightweight built-up fuselage thin sheet balsa Motor Tube fuselage builtMotor tube made 1164 1/32 sheet balsa rolled around dowel glued also can formed several layers tracing paper glued together Make tube di ameter least % Actually almost place between wing leading trailing edges will starter doubt place CG point one-third distance leading trailing edge Mark C G soft pencil can keep track have tested first tests somewhat easier remove propeller replace piece modeling clay equal weight models glide will better propeller changes want observe will easier see Leave prop isnt easy remove either put few turns rubber motor let free-wheel dont want thrust just want reduce drag prop during gliding tests first step gently glide model very few turns motor observe flight path During phase adjust elevator until get smooth descending glide Several glides trim setting will necessary make sure okay glide reasonably smooth continue Balance trim adjustments weird configurations like Blohm Voas BV141 ideal problema solving simple profiles felt-tip pen can wonders detailing otherwise plain all-sheet model mini Focke-Wuif Stosser shows benefits gliding model increasing speed until tossing harder ever would normal launch model tends zoom upward sharply loop too stable tends tuck nose under dive toward ground increased speeds unstable some quirk fate model continues shallow climb glides smoothly has small margin stability can proceed power tests Assuming model either zoomed upward dove ground move CG about ng modeling clay nose tail follows Move C G rearward clay tail bend elevator trailing edge down bit model zoomed upward Move CG forward clay nose bend elevator trailing edge up bit model dove After making C G incidence adjustments go back gentle launches Adjust elevator get smooth glide Repeat steps until have found CG remember marked time incidence combinations stable unstable use powered tests come next will just little forward marginally-stable point Table Fig 2 summarize process much clearly words Thrust line next step find proper thrust line angles Put very small amount rudder adjustment direction want flight path certain models clay weight wing tip works better rudder turn usually use left turn both power glide Once CG has established glide tests simply begin add more turns power flight tests proceed time use thrust angle changes get good power pattern adjustments pretty obvious cases point thrust line downward keep model zooming upward under first burst power point opposite direction Continued ~agc 143 August 1982 59 Rolfe Gregorys profile Wildcat simple impressive InuourImler Profiles easy build lots fun WW II airplanes like Hellcat tine tljers no LG clean lines have good duration help teach low-wing trimming sure etching well done slightest film copper will serve conductor high voltages resulting failure op-amp other high-voltage-sensitive parts Leads may pass using Teflon tubes 001 uF capacitors lead ground inside case ground RF needed external leads including trigger wires diodes around op-amp protect stray voltages lost two op-amps before diodes installed Herb WahI Hurleman-type plug has used over 50 hours great success low power engine relation cooling area 27 hours rich running made plug bit black still firing experimenting type spark system interests start coil can wind good coil rest relatively easy Good luck 15 mil wire will need Profiles/SruII Continued page 59 turn becomes too tight etc Use very small thrust changes degree two time since effect large under full power Dihedral angle tail area model cant made fly consistent circle either direction tightening its turn eventu ally diving probably have spiral stability problems especially common lowwing models little dihedral also appears some parasol configurations large vertical tail surfaces such Curtiss Junior case best remedy usually add dihedral abut two three degrees timeuntil problem subsides Another possible solution reduce vertical tail surface usually looks bad can also lead other stability problems Another tricky method worth try certain models add vertical side area above approximate CG position Walt Mooney sometimes does filling open cabane structure like Curtiss Junior has clear sheet thin plastic can hardly see it will sometimes trick another Walts models added large profile pilot figure otherwise empty cockpit added enough lateral area above CG low-wing model fly properly no dihedral Another problem occurs occasionally directional instability case model will tend wander direction somewhat will impossible adjust reliable turn pattern Unlike spiral stability problem men tioned above however model will tend spin fact directional wandering usually means model spirally stable simple cure difficulty increase vertical tail area find need large amount increase would spoil looks Scale creation can borrow another idea Walt Mooney add transparent tab vertical tail flight will hardly visible trying set CG incidence described earlier models flight path erratic pitch difficult get repeat able results horizontal tail surfaces may too small Add 20 30% horizontal tail area try again tinned page 144 COMPLETE THIS FOAM AND ATTACH MAILING LABEL FROM RECE NT E LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US Possessions elsewhere Including Canada MexIco $2400 US Schools $gOO US Libraries $1350 NAME ADDRESS CITY/STATE _____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW WASHINGTON DC 20005 August1982 143 distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER II INC 16650 South 104th AVENUE ORLANO PARK ILLINOIS 60462 soon bringing result years military research testing Watch Full Command Systems 908 E Rosewood Spokane WA 99207 509 487-2112 Other peculiar trimming problems may arise weird scale configurations can cutand-try solve little profile test machine problems discussed above ever tend common ones Scale models Construction methods case want try hand constructing profile model favorite airplane few design building tips observed published models models of local flying comrades two basic structural approaches allsheet surfaces built-up tissue-covered sur faces see Fig 3 built-up tissue-covered models can built lighter all-sheet models fore have potentially higher flight perform ance usually used profiles intended primarily Indoor flying bit time consuming build although very simple tend somewhat fragile solid sheet counterparts All-sheet models usually built thin 1/16 1/64 sheet balsa although local club members have using thin sheet foam plastic 1/32 3/32 thickness sheet plastic sliced large blocks dense blue-colored foamthe kind often used building insulation some areas foam material extremely easy use profile models believe partly respon sible popularity profiles club foam lighter balsa much less expensive As added bonus virtually warp-proof Flying outdoors damp grass cool damp evenings can quickly turn conven tional balsa-and-tissue models useless pret zels unless lots dope other moisture Tired stamped sheet-metal flat glow plug wrenches find 4way cast-metal ones clumsy use Bee Twister answertO prayers handle carefully shaped com fortable fit hand design makes easy reach plug buried deep inside cowling compact tool fits easily field box wrench designed fit popular glow plugs including GbBees its attractive plastic handle proudly displays Gb Bee logo shaft steel Get local hobby shop product review product review product review 144 Model Aviation product review product review product review Shape Things Come Technology-2000 D Designed Full Command Systems Canadian governments target drone program Full Command has now brought cutting edge Radio Control Technology hobbiest shaped like Old Fashioned radios Full iand Systems will Bee Twister glow plug wrench No 4228 $300 GloBee Division Twinn-K Inc PO Box 31 228 India napolis IN 46231 4E*SE5a KITS 1/4 SCALE SEMI KIT13900 1/4 SCALE COMPLETE KIT. 19900 1/3 SCALE SEMI KIT16900 1/3 SCALE COMPLETE KIT.22900 PLEASE ADD $750 FOR SHIPPING i/4 3CALE SPAN 80 WEIGHT 201 ENGINE QUADRA 1/3 SCALE SPAN 106 WEIGHT 781 ENGINE QUADRA SEMI 51113 CONTAIN SAWED AND SANDED FORNERS WALL WING RIBS TIPS RUDDER AND STAB OUTLINED SIZE PLAPS CPLETE KItS CONTAIN THE ADOYR PARTS ALL PINE AND BALSA STRIP WOOD WARE SEND *1 00 FOR OUR OWIPLETE CATALOG PHDNE 1419 599-2121 proofer has used case all-sheet profile models very simple build can easily decorated felt-tip pens excellent projects begin ners just getting powered Free Flight models Holding motor prop Fig 4 shows three basic ways support rubber motor model 1 hole fuselage 2 motor stick 3 motor tube classic most-used scheme hole fuselage method best suited forthe all-sheet balsa model fuselage rigid enough support fully wound motor weaker construction used such very thin sheet balsa foam built-up structure motor stick motor tube will required support pull fully wound motor motor stick can simple piece 3/32 3/16 balsa very lightweight models can small rolled tube 1/32 1/64 balsa Ia Indoor practice rubber motor also can fully enclosed fairly large diameter tube built part fuselage Such motor tube should least -in diameter provide sutlicient clear ance unwinding rubber motor tube can made wrapping 1/32 1/64 balsa several layers paper around dowel Attaching prop Fig 5 shows different types prop bearings used motor sticks Remember trying new novel design allowance should made easy thrust-line adjustments fixed thrust bearings have cut off re-glued time thrust line changed sample proflle design build would like try practice profile model full-size plans provided 6-in-span version experimental Japanese Navy fighter Kyushu Shinden Construction built-up tissuecovered variety plans indicate CG. incidence thrust adjustments have worked models Flights over two minutes possible little bird Give try see can find other better trim settings Best luck new flight test tools FF Duration/Meuser Continued page 67 note Bill Bogart seems friend Bills dredged up report written Seredinsky both friend Seredinsky work ing Grumman So far have title page interior page Bill thought might find interesting shows airfoil cross sections labeled Modifications Airfoil Se 4410 first four sections original 1% LE radius modified version 3% nose radius turbulator wire ahead foil apparently something like sand stuck top surface over first 20% chord Number five now-familiar flamingo foil Also shown CL-vs-CD polars five sections derived model flight tests Reynolds-number range 45 000 tO 30000 Thtts live curves seem little /on smooth no experimental points arc shown makes feel little uneasy nevertheless. Worst hunch wis 3%-nose oh Ahie leg upwas un-modded Se 4410 1% nose came sandy surface mod original foil turbulator % diameter situated 7% ahead L E roughly 1% above bottom-surface chord line Best bunch flamingo its Hobby Shack RADIO RIOT BA 6 channel w/4 Ca 5-26 ser vos tull Ni Cd & char9er z9$16995 LIST $30995 5 channel w/4 ea S-26 ser vos dual rates full Ni-Cd LIST $27995 $15499 6 channel w/2dual rates 6 servos reversing switches 1ST $34995 U name3 U address cityU U statezip3 U mail order catalogs 18480 BANDILIER CIRCLE U FOUNTAIN VALLEY CA 928708 POSTAGE AND HANDLING CHARGES 3 $000 $2500 add $300 $2501 $5000 add $400 U Over $5000 add $500 California residents add 6% state sales tax mminmin August1982 145 kYShaCI CIRRUS I850 XLC system w/4 Lw OEft6N 649 APPIAN NAPOLEON OHIO 43545
Edition: Model Aviation - 1982/08
Page Numbers: 54, 55, 56, 57, 58, 59, 143, 144, 145
For Fun Test PROP IL IIODLS Thought simple rubber-powered profiles scale configurations justforfun did Youd surprised wealth informa tion author has learned models can applied fully developed detailed planes help assure flight sucess boot plans Kvushu Shinden profile EDon Srull RUBBER-POWERED profile models have around long time provide logical step young modelers ready gradu ate Hand-Launched Gliders stick models such famous AMA Cub excellent designs have appeared model press over years designers note publish numerous fine profile designs ol Scale author Mirage delta profile has 16 span produces 30 length long rubber motor plane required tandem counter-rotating props too much torque single prop short wingspan handle Two different profiles Japanese Shinden fighter aircraft lightweight version left full-size plans presented article proved design fine flier all-sheet version right bit heavier much sturdyfor outdoor use master Bill Hannan popularity profiles has enhanced considerably several fun-type competitive events offered Free Flight clubs example Flightmasters San Diego biteers DC Maxecuters Flying Aces Club sponsor profile events Scale Catapult Gliders Scale Rubber-Powered models Flying rather scale detail name game Another use skinny models also known No-Cals powered test vehicles new untried unconventional designs profile version new model design can very useful determining whether new design will suitable elegant model respect stability Perhaps important profile model can also help determine proper location center gravity CG necessary amount angular difference between wing stabilizer correct thrust angle minimum dihedral minimum stabilizer vertical fin sizes Thats bad small investment time materials eh results way just appropriate Rubber-Powered Scale models can also helpful powered Free Flight Scale Radio Control Scale models During recent years have built several dozen profile models both entry No-Cal contests test beds unusual Scale model config urations Delta wings flying wings canards pushers tandem twin-engine configurations have tried club members has built mastered unusual Blohm Voss asymmetrical configuration could have done fully built-up models aircraft course tremendous vestment time goodness knows much cussing profile test models inding1 possible determine fair accuracy what design deviations true scale necessary what complete trim arrangements produced good stable flight perform ance case flying wing design shall remain nameless found basic configuration real turkey darn thing problems way imaginableand some werent saved lot further wasted time frustration particular subject plus side particularly good luck profile model tests twin-engined pushpull Dornier Do335 Its potential seemed much better imagined put together larger built-up Rubber model Dornier subsequently -in RC Scale model same bird profile model pro vided good estimates wing/stab angular difference thrust angles dihedral requirements larger Rubber model As result very minor adjustments changes required after larger model built RC project similarly benefited also got lot useful information out canard profile model Japanese Navy ex perimental fighter Kyushu Shinden original model proved rather tricky adjust large part due no doubt August1982 55 V JN V /1 / / II II1 JAPANESE NAVY SHI NDEN 16 SPAN PROFILE 320t frail TRIM FOR RIGHT TURN POWER WITH 3/32 10 1/8 RUBBER LOOP16TO 20LONG 1/16 SHEET lBS R 1/2 DIHEDRAL / / 1/16x 1/8 IE 1/32 SHEET TABS COVER ALL SURFACES ONE SIDE WITH LIGHT TISSUE DO NOT WATER SHRINK OR DOPE 7/ 3/32 X 3/16 MOTOR STICK 1/18 SQ __ 56 Model Aviation II N 1/l5xVs TEI /V16 / / 1/8 DIHEDRAL I/ FORM BLADES ROUNDED 1/8 SQOVER COFFEE BALSA HUBCAN 4 FU50 AT IHlS LINE1/32 SHEET BLADES LEFT HAND PROP 2 1/2 DOWN 40 LEFT THRUST August1982 57 CG Built-Up Lighter Fragile Work Higher Performance / CA// 1fIr1rLight Tissue Coveringone both sides Light Simple All-Balsa Frameworkall surfaces Wooden Gear Balsa Wheels Balsa Prop Figure 4Holding Minor dowel rear peg Make slot Balsaleast 4- wide nose plug Laminated balsa nose block water-shrink dope lightweight modelsl Magic Markers thinly-sprayed model enamel OK color trim fact have built flown very few canards Eventually proper CG location found combined what seemed excessive amount angular difference between wing forward canard surface fairly large amount upthrust equivalent downthrust tractor configuration also found necessary adjustments Shinden demon strated exceptional flight performance sta bility lighter profile model built also larger built-up Rubber Scale model using same force arrangements original profile Lo behold built-in adjustments worked exactly profile very minor trimming required get both flying well Several other similar experiences have con vinced small profile models indeed provide accurate insight flight characteristics trim requirements larger built-up model Its simple fun way save time frustration take surprises out trimming large new beautiful Scale project might also steer away real dogs worth effort fight through flight trimming stages may have trimmed Free Flight Scale models before some procedures have found work pretty well certainly other ways go about trimming model tech niques may worth try start very easy profile model CG wing/stab angles idea determine combination C G wing tail angular difference provides just enough pitch up down stability dont want too much pitch stability will add unnecessary drag certainly cant get too little model wont fly general further forward CG greater stabilityand vice versa see Fig 1 want find point pitch stability disappears marginal move CG forward just little until adequate stability reappears First make absolutely sure flying surfaces straight free warps before testing Its surprising modelers experienced ones sometimes skip step After have determined surfaces true use modeling clay place CG point think should little rearward Keep rear hook prop bearing hole least 3116 V4 away motor stick rubber clearance 58 Model Aviation Figure 3Basic Consi Sturdy Simple S06 Plastic Prop ng sheet fuselage Hole Fuselage Motor Stick Motor stick Lightweight built-up fuselage thin sheet balsa Motor Tube fuselage builtMotor tube made 1164 1/32 sheet balsa rolled around dowel glued also can formed several layers tracing paper glued together Make tube di ameter least % Actually almost place between wing leading trailing edges will starter doubt place CG point one-third distance leading trailing edge Mark C G soft pencil can keep track have tested first tests somewhat easier remove propeller replace piece modeling clay equal weight models glide will better propeller changes want observe will easier see Leave prop isnt easy remove either put few turns rubber motor let free-wheel dont want thrust just want reduce drag prop during gliding tests first step gently glide model very few turns motor observe flight path During phase adjust elevator until get smooth descending glide Several glides trim setting will necessary make sure okay glide reasonably smooth continue Balance trim adjustments weird configurations like Blohm Voas BV141 ideal problema solving simple profiles felt-tip pen can wonders detailing otherwise plain all-sheet model mini Focke-Wuif Stosser shows benefits gliding model increasing speed until tossing harder ever would normal launch model tends zoom upward sharply loop too stable tends tuck nose under dive toward ground increased speeds unstable some quirk fate model continues shallow climb glides smoothly has small margin stability can proceed power tests Assuming model either zoomed upward dove ground move CG about ng modeling clay nose tail follows Move C G rearward clay tail bend elevator trailing edge down bit model zoomed upward Move CG forward clay nose bend elevator trailing edge up bit model dove After making C G incidence adjustments go back gentle launches Adjust elevator get smooth glide Repeat steps until have found CG remember marked time incidence combinations stable unstable use powered tests come next will just little forward marginally-stable point Table Fig 2 summarize process much clearly words Thrust line next step find proper thrust line angles Put very small amount rudder adjustment direction want flight path certain models clay weight wing tip works better rudder turn usually use left turn both power glide Once CG has established glide tests simply begin add more turns power flight tests proceed time use thrust angle changes get good power pattern adjustments pretty obvious cases point thrust line downward keep model zooming upward under first burst power point opposite direction Continued ~agc 143 August 1982 59 Rolfe Gregorys profile Wildcat simple impressive InuourImler Profiles easy build lots fun WW II airplanes like Hellcat tine tljers no LG clean lines have good duration help teach low-wing trimming sure etching well done slightest film copper will serve conductor high voltages resulting failure op-amp other high-voltage-sensitive parts Leads may pass using Teflon tubes 001 uF capacitors lead ground inside case ground RF needed external leads including trigger wires diodes around op-amp protect stray voltages lost two op-amps before diodes installed Herb WahI Hurleman-type plug has used over 50 hours great success low power engine relation cooling area 27 hours rich running made plug bit black still firing experimenting type spark system interests start coil can wind good coil rest relatively easy Good luck 15 mil wire will need Profiles/SruII Continued page 59 turn becomes too tight etc Use very small thrust changes degree two time since effect large under full power Dihedral angle tail area model cant made fly consistent circle either direction tightening its turn eventu ally diving probably have spiral stability problems especially common lowwing models little dihedral also appears some parasol configurations large vertical tail surfaces such Curtiss Junior case best remedy usually add dihedral abut two three degrees timeuntil problem subsides Another possible solution reduce vertical tail surface usually looks bad can also lead other stability problems Another tricky method worth try certain models add vertical side area above approximate CG position Walt Mooney sometimes does filling open cabane structure like Curtiss Junior has clear sheet thin plastic can hardly see it will sometimes trick another Walts models added large profile pilot figure otherwise empty cockpit added enough lateral area above CG low-wing model fly properly no dihedral Another problem occurs occasionally directional instability case model will tend wander direction somewhat will impossible adjust reliable turn pattern Unlike spiral stability problem men tioned above however model will tend spin fact directional wandering usually means model spirally stable simple cure difficulty increase vertical tail area find need large amount increase would spoil looks Scale creation can borrow another idea Walt Mooney add transparent tab vertical tail flight will hardly visible trying set CG incidence described earlier models flight path erratic pitch difficult get repeat able results horizontal tail surfaces may too small Add 20 30% horizontal tail area try again tinned page 144 COMPLETE THIS FOAM AND ATTACH MAILING LABEL FROM RECE NT E LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US Possessions elsewhere Including Canada MexIco $2400 US Schools $gOO US Libraries $1350 NAME ADDRESS CITY/STATE _____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW WASHINGTON DC 20005 August1982 143 distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER II INC 16650 South 104th AVENUE ORLANO PARK ILLINOIS 60462 soon bringing result years military research testing Watch Full Command Systems 908 E Rosewood Spokane WA 99207 509 487-2112 Other peculiar trimming problems may arise weird scale configurations can cutand-try solve little profile test machine problems discussed above ever tend common ones Scale models Construction methods case want try hand constructing profile model favorite airplane few design building tips observed published models models of local flying comrades two basic structural approaches allsheet surfaces built-up tissue-covered sur faces see Fig 3 built-up tissue-covered models can built lighter all-sheet models fore have potentially higher flight perform ance usually used profiles intended primarily Indoor flying bit time consuming build although very simple tend somewhat fragile solid sheet counterparts All-sheet models usually built thin 1/16 1/64 sheet balsa although local club members have using thin sheet foam plastic 1/32 3/32 thickness sheet plastic sliced large blocks dense blue-colored foamthe kind often used building insulation some areas foam material extremely easy use profile models believe partly respon sible popularity profiles club foam lighter balsa much less expensive As added bonus virtually warp-proof Flying outdoors damp grass cool damp evenings can quickly turn conven tional balsa-and-tissue models useless pret zels unless lots dope other moisture Tired stamped sheet-metal flat glow plug wrenches find 4way cast-metal ones clumsy use Bee Twister answertO prayers handle carefully shaped com fortable fit hand design makes easy reach plug buried deep inside cowling compact tool fits easily field box wrench designed fit popular glow plugs including GbBees its attractive plastic handle proudly displays Gb Bee logo shaft steel Get local hobby shop product review product review product review 144 Model Aviation product review product review product review Shape Things Come Technology-2000 D Designed Full Command Systems Canadian governments target drone program Full Command has now brought cutting edge Radio Control Technology hobbiest shaped like Old Fashioned radios Full iand Systems will Bee Twister glow plug wrench No 4228 $300 GloBee Division Twinn-K Inc PO Box 31 228 India napolis IN 46231 4E*SE5a KITS 1/4 SCALE SEMI KIT13900 1/4 SCALE COMPLETE KIT. 19900 1/3 SCALE SEMI KIT16900 1/3 SCALE COMPLETE KIT.22900 PLEASE ADD $750 FOR SHIPPING i/4 3CALE SPAN 80 WEIGHT 201 ENGINE QUADRA 1/3 SCALE SPAN 106 WEIGHT 781 ENGINE QUADRA SEMI 51113 CONTAIN SAWED AND SANDED FORNERS WALL WING RIBS TIPS RUDDER AND STAB OUTLINED SIZE PLAPS CPLETE KItS CONTAIN THE ADOYR PARTS ALL PINE AND BALSA STRIP WOOD WARE SEND *1 00 FOR OUR OWIPLETE CATALOG PHDNE 1419 599-2121 proofer has used case all-sheet profile models very simple build can easily decorated felt-tip pens excellent projects begin ners just getting powered Free Flight models Holding motor prop Fig 4 shows three basic ways support rubber motor model 1 hole fuselage 2 motor stick 3 motor tube classic most-used scheme hole fuselage method best suited forthe all-sheet balsa model fuselage rigid enough support fully wound motor weaker construction used such very thin sheet balsa foam built-up structure motor stick motor tube will required support pull fully wound motor motor stick can simple piece 3/32 3/16 balsa very lightweight models can small rolled tube 1/32 1/64 balsa Ia Indoor practice rubber motor also can fully enclosed fairly large diameter tube built part fuselage Such motor tube should least -in diameter provide sutlicient clear ance unwinding rubber motor tube can made wrapping 1/32 1/64 balsa several layers paper around dowel Attaching prop Fig 5 shows different types prop bearings used motor sticks Remember trying new novel design allowance should made easy thrust-line adjustments fixed thrust bearings have cut off re-glued time thrust line changed sample proflle design build would like try practice profile model full-size plans provided 6-in-span version experimental Japanese Navy fighter Kyushu Shinden Construction built-up tissuecovered variety plans indicate CG. incidence thrust adjustments have worked models Flights over two minutes possible little bird Give try see can find other better trim settings Best luck new flight test tools FF Duration/Meuser Continued page 67 note Bill Bogart seems friend Bills dredged up report written Seredinsky both friend Seredinsky work ing Grumman So far have title page interior page Bill thought might find interesting shows airfoil cross sections labeled Modifications Airfoil Se 4410 first four sections original 1% LE radius modified version 3% nose radius turbulator wire ahead foil apparently something like sand stuck top surface over first 20% chord Number five now-familiar flamingo foil Also shown CL-vs-CD polars five sections derived model flight tests Reynolds-number range 45 000 tO 30000 Thtts live curves seem little /on smooth no experimental points arc shown makes feel little uneasy nevertheless. Worst hunch wis 3%-nose oh Ahie leg upwas un-modded Se 4410 1% nose came sandy surface mod original foil turbulator % diameter situated 7% ahead L E roughly 1% above bottom-surface chord line Best bunch flamingo its Hobby Shack RADIO RIOT BA 6 channel w/4 Ca 5-26 ser vos tull Ni Cd & char9er z9$16995 LIST $30995 5 channel w/4 ea S-26 ser vos dual rates full Ni-Cd LIST $27995 $15499 6 channel w/2dual rates 6 servos reversing switches 1ST $34995 U name3 U address cityU U statezip3 U mail order catalogs 18480 BANDILIER CIRCLE U FOUNTAIN VALLEY CA 928708 POSTAGE AND HANDLING CHARGES 3 $000 $2500 add $300 $2501 $5000 add $400 U Over $5000 add $500 California residents add 6% state sales tax mminmin August1982 145 kYShaCI CIRRUS I850 XLC system w/4 Lw OEft6N 649 APPIAN NAPOLEON OHIO 43545
Edition: Model Aviation - 1982/08
Page Numbers: 54, 55, 56, 57, 58, 59, 143, 144, 145
For Fun Test PROP IL IIODLS Thought simple rubber-powered profiles scale configurations justforfun did Youd surprised wealth informa tion author has learned models can applied fully developed detailed planes help assure flight sucess boot plans Kvushu Shinden profile EDon Srull RUBBER-POWERED profile models have around long time provide logical step young modelers ready gradu ate Hand-Launched Gliders stick models such famous AMA Cub excellent designs have appeared model press over years designers note publish numerous fine profile designs ol Scale author Mirage delta profile has 16 span produces 30 length long rubber motor plane required tandem counter-rotating props too much torque single prop short wingspan handle Two different profiles Japanese Shinden fighter aircraft lightweight version left full-size plans presented article proved design fine flier all-sheet version right bit heavier much sturdyfor outdoor use master Bill Hannan popularity profiles has enhanced considerably several fun-type competitive events offered Free Flight clubs example Flightmasters San Diego biteers DC Maxecuters Flying Aces Club sponsor profile events Scale Catapult Gliders Scale Rubber-Powered models Flying rather scale detail name game Another use skinny models also known No-Cals powered test vehicles new untried unconventional designs profile version new model design can very useful determining whether new design will suitable elegant model respect stability Perhaps important profile model can also help determine proper location center gravity CG necessary amount angular difference between wing stabilizer correct thrust angle minimum dihedral minimum stabilizer vertical fin sizes Thats bad small investment time materials eh results way just appropriate Rubber-Powered Scale models can also helpful powered Free Flight Scale Radio Control Scale models During recent years have built several dozen profile models both entry No-Cal contests test beds unusual Scale model config urations Delta wings flying wings canards pushers tandem twin-engine configurations have tried club members has built mastered unusual Blohm Voss asymmetrical configuration could have done fully built-up models aircraft course tremendous vestment time goodness knows much cussing profile test models inding1 possible determine fair accuracy what design deviations true scale necessary what complete trim arrangements produced good stable flight perform ance case flying wing design shall remain nameless found basic configuration real turkey darn thing problems way imaginableand some werent saved lot further wasted time frustration particular subject plus side particularly good luck profile model tests twin-engined pushpull Dornier Do335 Its potential seemed much better imagined put together larger built-up Rubber model Dornier subsequently -in RC Scale model same bird profile model pro vided good estimates wing/stab angular difference thrust angles dihedral requirements larger Rubber model As result very minor adjustments changes required after larger model built RC project similarly benefited also got lot useful information out canard profile model Japanese Navy ex perimental fighter Kyushu Shinden original model proved rather tricky adjust large part due no doubt August1982 55 V JN V /1 / / II II1 JAPANESE NAVY SHI NDEN 16 SPAN PROFILE 320t frail TRIM FOR RIGHT TURN POWER WITH 3/32 10 1/8 RUBBER LOOP16TO 20LONG 1/16 SHEET lBS R 1/2 DIHEDRAL / / 1/16x 1/8 IE 1/32 SHEET TABS COVER ALL SURFACES ONE SIDE WITH LIGHT TISSUE DO NOT WATER SHRINK OR DOPE 7/ 3/32 X 3/16 MOTOR STICK 1/18 SQ __ 56 Model Aviation II N 1/l5xVs TEI /V16 / / 1/8 DIHEDRAL I/ FORM BLADES ROUNDED 1/8 SQOVER COFFEE BALSA HUBCAN 4 FU50 AT IHlS LINE1/32 SHEET BLADES LEFT HAND PROP 2 1/2 DOWN 40 LEFT THRUST August1982 57 CG Built-Up Lighter Fragile Work Higher Performance / CA// 1fIr1rLight Tissue Coveringone both sides Light Simple All-Balsa Frameworkall surfaces Wooden Gear Balsa Wheels Balsa Prop Figure 4Holding Minor dowel rear peg Make slot Balsaleast 4- wide nose plug Laminated balsa nose block water-shrink dope lightweight modelsl Magic Markers thinly-sprayed model enamel OK color trim fact have built flown very few canards Eventually proper CG location found combined what seemed excessive amount angular difference between wing forward canard surface fairly large amount upthrust equivalent downthrust tractor configuration also found necessary adjustments Shinden demon strated exceptional flight performance sta bility lighter profile model built also larger built-up Rubber Scale model using same force arrangements original profile Lo behold built-in adjustments worked exactly profile very minor trimming required get both flying well Several other similar experiences have con vinced small profile models indeed provide accurate insight flight characteristics trim requirements larger built-up model Its simple fun way save time frustration take surprises out trimming large new beautiful Scale project might also steer away real dogs worth effort fight through flight trimming stages may have trimmed Free Flight Scale models before some procedures have found work pretty well certainly other ways go about trimming model tech niques may worth try start very easy profile model CG wing/stab angles idea determine combination C G wing tail angular difference provides just enough pitch up down stability dont want too much pitch stability will add unnecessary drag certainly cant get too little model wont fly general further forward CG greater stabilityand vice versa see Fig 1 want find point pitch stability disappears marginal move CG forward just little until adequate stability reappears First make absolutely sure flying surfaces straight free warps before testing Its surprising modelers experienced ones sometimes skip step After have determined surfaces true use modeling clay place CG point think should little rearward Keep rear hook prop bearing hole least 3116 V4 away motor stick rubber clearance 58 Model Aviation Figure 3Basic Consi Sturdy Simple S06 Plastic Prop ng sheet fuselage Hole Fuselage Motor Stick Motor stick Lightweight built-up fuselage thin sheet balsa Motor Tube fuselage builtMotor tube made 1164 1/32 sheet balsa rolled around dowel glued also can formed several layers tracing paper glued together Make tube di ameter least % Actually almost place between wing leading trailing edges will starter doubt place CG point one-third distance leading trailing edge Mark C G soft pencil can keep track have tested first tests somewhat easier remove propeller replace piece modeling clay equal weight models glide will better propeller changes want observe will easier see Leave prop isnt easy remove either put few turns rubber motor let free-wheel dont want thrust just want reduce drag prop during gliding tests first step gently glide model very few turns motor observe flight path During phase adjust elevator until get smooth descending glide Several glides trim setting will necessary make sure okay glide reasonably smooth continue Balance trim adjustments weird configurations like Blohm Voas BV141 ideal problema solving simple profiles felt-tip pen can wonders detailing otherwise plain all-sheet model mini Focke-Wuif Stosser shows benefits gliding model increasing speed until tossing harder ever would normal launch model tends zoom upward sharply loop too stable tends tuck nose under dive toward ground increased speeds unstable some quirk fate model continues shallow climb glides smoothly has small margin stability can proceed power tests Assuming model either zoomed upward dove ground move CG about ng modeling clay nose tail follows Move C G rearward clay tail bend elevator trailing edge down bit model zoomed upward Move CG forward clay nose bend elevator trailing edge up bit model dove After making C G incidence adjustments go back gentle launches Adjust elevator get smooth glide Repeat steps until have found CG remember marked time incidence combinations stable unstable use powered tests come next will just little forward marginally-stable point Table Fig 2 summarize process much clearly words Thrust line next step find proper thrust line angles Put very small amount rudder adjustment direction want flight path certain models clay weight wing tip works better rudder turn usually use left turn both power glide Once CG has established glide tests simply begin add more turns power flight tests proceed time use thrust angle changes get good power pattern adjustments pretty obvious cases point thrust line downward keep model zooming upward under first burst power point opposite direction Continued ~agc 143 August 1982 59 Rolfe Gregorys profile Wildcat simple impressive InuourImler Profiles easy build lots fun WW II airplanes like Hellcat tine tljers no LG clean lines have good duration help teach low-wing trimming sure etching well done slightest film copper will serve conductor high voltages resulting failure op-amp other high-voltage-sensitive parts Leads may pass using Teflon tubes 001 uF capacitors lead ground inside case ground RF needed external leads including trigger wires diodes around op-amp protect stray voltages lost two op-amps before diodes installed Herb WahI Hurleman-type plug has used over 50 hours great success low power engine relation cooling area 27 hours rich running made plug bit black still firing experimenting type spark system interests start coil can wind good coil rest relatively easy Good luck 15 mil wire will need Profiles/SruII Continued page 59 turn becomes too tight etc Use very small thrust changes degree two time since effect large under full power Dihedral angle tail area model cant made fly consistent circle either direction tightening its turn eventu ally diving probably have spiral stability problems especially common lowwing models little dihedral also appears some parasol configurations large vertical tail surfaces such Curtiss Junior case best remedy usually add dihedral abut two three degrees timeuntil problem subsides Another possible solution reduce vertical tail surface usually looks bad can also lead other stability problems Another tricky method worth try certain models add vertical side area above approximate CG position Walt Mooney sometimes does filling open cabane structure like Curtiss Junior has clear sheet thin plastic can hardly see it will sometimes trick another Walts models added large profile pilot figure otherwise empty cockpit added enough lateral area above CG low-wing model fly properly no dihedral Another problem occurs occasionally directional instability case model will tend wander direction somewhat will impossible adjust reliable turn pattern Unlike spiral stability problem men tioned above however model will tend spin fact directional wandering usually means model spirally stable simple cure difficulty increase vertical tail area find need large amount increase would spoil looks Scale creation can borrow another idea Walt Mooney add transparent tab vertical tail flight will hardly visible trying set CG incidence described earlier models flight path erratic pitch difficult get repeat able results horizontal tail surfaces may too small Add 20 30% horizontal tail area try again tinned page 144 COMPLETE THIS FOAM AND ATTACH MAILING LABEL FROM RECE NT E LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US Possessions elsewhere Including Canada MexIco $2400 US Schools $gOO US Libraries $1350 NAME ADDRESS CITY/STATE _____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW WASHINGTON DC 20005 August1982 143 distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER II INC 16650 South 104th AVENUE ORLANO PARK ILLINOIS 60462 soon bringing result years military research testing Watch Full Command Systems 908 E Rosewood Spokane WA 99207 509 487-2112 Other peculiar trimming problems may arise weird scale configurations can cutand-try solve little profile test machine problems discussed above ever tend common ones Scale models Construction methods case want try hand constructing profile model favorite airplane few design building tips observed published models models of local flying comrades two basic structural approaches allsheet surfaces built-up tissue-covered sur faces see Fig 3 built-up tissue-covered models can built lighter all-sheet models fore have potentially higher flight perform ance usually used profiles intended primarily Indoor flying bit time consuming build although very simple tend somewhat fragile solid sheet counterparts All-sheet models usually built thin 1/16 1/64 sheet balsa although local club members have using thin sheet foam plastic 1/32 3/32 thickness sheet plastic sliced large blocks dense blue-colored foamthe kind often used building insulation some areas foam material extremely easy use profile models believe partly respon sible popularity profiles club foam lighter balsa much less expensive As added bonus virtually warp-proof Flying outdoors damp grass cool damp evenings can quickly turn conven tional balsa-and-tissue models useless pret zels unless lots dope other moisture Tired stamped sheet-metal flat glow plug wrenches find 4way cast-metal ones clumsy use Bee Twister answertO prayers handle carefully shaped com fortable fit hand design makes easy reach plug buried deep inside cowling compact tool fits easily field box wrench designed fit popular glow plugs including GbBees its attractive plastic handle proudly displays Gb Bee logo shaft steel Get local hobby shop product review product review product review 144 Model Aviation product review product review product review Shape Things Come Technology-2000 D Designed Full Command Systems Canadian governments target drone program Full Command has now brought cutting edge Radio Control Technology hobbiest shaped like Old Fashioned radios Full iand Systems will Bee Twister glow plug wrench No 4228 $300 GloBee Division Twinn-K Inc PO Box 31 228 India napolis IN 46231 4E*SE5a KITS 1/4 SCALE SEMI KIT13900 1/4 SCALE COMPLETE KIT. 19900 1/3 SCALE SEMI KIT16900 1/3 SCALE COMPLETE KIT.22900 PLEASE ADD $750 FOR SHIPPING i/4 3CALE SPAN 80 WEIGHT 201 ENGINE QUADRA 1/3 SCALE SPAN 106 WEIGHT 781 ENGINE QUADRA SEMI 51113 CONTAIN SAWED AND SANDED FORNERS WALL WING RIBS TIPS RUDDER AND STAB OUTLINED SIZE PLAPS CPLETE KItS CONTAIN THE ADOYR PARTS ALL PINE AND BALSA STRIP WOOD WARE SEND *1 00 FOR OUR OWIPLETE CATALOG PHDNE 1419 599-2121 proofer has used case all-sheet profile models very simple build can easily decorated felt-tip pens excellent projects begin ners just getting powered Free Flight models Holding motor prop Fig 4 shows three basic ways support rubber motor model 1 hole fuselage 2 motor stick 3 motor tube classic most-used scheme hole fuselage method best suited forthe all-sheet balsa model fuselage rigid enough support fully wound motor weaker construction used such very thin sheet balsa foam built-up structure motor stick motor tube will required support pull fully wound motor motor stick can simple piece 3/32 3/16 balsa very lightweight models can small rolled tube 1/32 1/64 balsa Ia Indoor practice rubber motor also can fully enclosed fairly large diameter tube built part fuselage Such motor tube should least -in diameter provide sutlicient clear ance unwinding rubber motor tube can made wrapping 1/32 1/64 balsa several layers paper around dowel Attaching prop Fig 5 shows different types prop bearings used motor sticks Remember trying new novel design allowance should made easy thrust-line adjustments fixed thrust bearings have cut off re-glued time thrust line changed sample proflle design build would like try practice profile model full-size plans provided 6-in-span version experimental Japanese Navy fighter Kyushu Shinden Construction built-up tissuecovered variety plans indicate CG. incidence thrust adjustments have worked models Flights over two minutes possible little bird Give try see can find other better trim settings Best luck new flight test tools FF Duration/Meuser Continued page 67 note Bill Bogart seems friend Bills dredged up report written Seredinsky both friend Seredinsky work ing Grumman So far have title page interior page Bill thought might find interesting shows airfoil cross sections labeled Modifications Airfoil Se 4410 first four sections original 1% LE radius modified version 3% nose radius turbulator wire ahead foil apparently something like sand stuck top surface over first 20% chord Number five now-familiar flamingo foil Also shown CL-vs-CD polars five sections derived model flight tests Reynolds-number range 45 000 tO 30000 Thtts live curves seem little /on smooth no experimental points arc shown makes feel little uneasy nevertheless. Worst hunch wis 3%-nose oh Ahie leg upwas un-modded Se 4410 1% nose came sandy surface mod original foil turbulator % diameter situated 7% ahead L E roughly 1% above bottom-surface chord line Best bunch flamingo its Hobby Shack RADIO RIOT BA 6 channel w/4 Ca 5-26 ser vos tull Ni Cd & char9er z9$16995 LIST $30995 5 channel w/4 ea S-26 ser vos dual rates full Ni-Cd LIST $27995 $15499 6 channel w/2dual rates 6 servos reversing switches 1ST $34995 U name3 U address cityU U statezip3 U mail order catalogs 18480 BANDILIER CIRCLE U FOUNTAIN VALLEY CA 928708 POSTAGE AND HANDLING CHARGES 3 $000 $2500 add $300 $2501 $5000 add $400 U Over $5000 add $500 California residents add 6% state sales tax mminmin August1982 145 kYShaCI CIRRUS I850 XLC system w/4 Lw OEft6N 649 APPIAN NAPOLEON OHIO 43545
Edition: Model Aviation - 1982/08
Page Numbers: 54, 55, 56, 57, 58, 59, 143, 144, 145
For Fun Test PROP IL IIODLS Thought simple rubber-powered profiles scale configurations justforfun did Youd surprised wealth informa tion author has learned models can applied fully developed detailed planes help assure flight sucess boot plans Kvushu Shinden profile EDon Srull RUBBER-POWERED profile models have around long time provide logical step young modelers ready gradu ate Hand-Launched Gliders stick models such famous AMA Cub excellent designs have appeared model press over years designers note publish numerous fine profile designs ol Scale author Mirage delta profile has 16 span produces 30 length long rubber motor plane required tandem counter-rotating props too much torque single prop short wingspan handle Two different profiles Japanese Shinden fighter aircraft lightweight version left full-size plans presented article proved design fine flier all-sheet version right bit heavier much sturdyfor outdoor use master Bill Hannan popularity profiles has enhanced considerably several fun-type competitive events offered Free Flight clubs example Flightmasters San Diego biteers DC Maxecuters Flying Aces Club sponsor profile events Scale Catapult Gliders Scale Rubber-Powered models Flying rather scale detail name game Another use skinny models also known No-Cals powered test vehicles new untried unconventional designs profile version new model design can very useful determining whether new design will suitable elegant model respect stability Perhaps important profile model can also help determine proper location center gravity CG necessary amount angular difference between wing stabilizer correct thrust angle minimum dihedral minimum stabilizer vertical fin sizes Thats bad small investment time materials eh results way just appropriate Rubber-Powered Scale models can also helpful powered Free Flight Scale Radio Control Scale models During recent years have built several dozen profile models both entry No-Cal contests test beds unusual Scale model config urations Delta wings flying wings canards pushers tandem twin-engine configurations have tried club members has built mastered unusual Blohm Voss asymmetrical configuration could have done fully built-up models aircraft course tremendous vestment time goodness knows much cussing profile test models inding1 possible determine fair accuracy what design deviations true scale necessary what complete trim arrangements produced good stable flight perform ance case flying wing design shall remain nameless found basic configuration real turkey darn thing problems way imaginableand some werent saved lot further wasted time frustration particular subject plus side particularly good luck profile model tests twin-engined pushpull Dornier Do335 Its potential seemed much better imagined put together larger built-up Rubber model Dornier subsequently -in RC Scale model same bird profile model pro vided good estimates wing/stab angular difference thrust angles dihedral requirements larger Rubber model As result very minor adjustments changes required after larger model built RC project similarly benefited also got lot useful information out canard profile model Japanese Navy ex perimental fighter Kyushu Shinden original model proved rather tricky adjust large part due no doubt August1982 55 V JN V /1 / / II II1 JAPANESE NAVY SHI NDEN 16 SPAN PROFILE 320t frail TRIM FOR RIGHT TURN POWER WITH 3/32 10 1/8 RUBBER LOOP16TO 20LONG 1/16 SHEET lBS R 1/2 DIHEDRAL / / 1/16x 1/8 IE 1/32 SHEET TABS COVER ALL SURFACES ONE SIDE WITH LIGHT TISSUE DO NOT WATER SHRINK OR DOPE 7/ 3/32 X 3/16 MOTOR STICK 1/18 SQ __ 56 Model Aviation II N 1/l5xVs TEI /V16 / / 1/8 DIHEDRAL I/ FORM BLADES ROUNDED 1/8 SQOVER COFFEE BALSA HUBCAN 4 FU50 AT IHlS LINE1/32 SHEET BLADES LEFT HAND PROP 2 1/2 DOWN 40 LEFT THRUST August1982 57 CG Built-Up Lighter Fragile Work Higher Performance / CA// 1fIr1rLight Tissue Coveringone both sides Light Simple All-Balsa Frameworkall surfaces Wooden Gear Balsa Wheels Balsa Prop Figure 4Holding Minor dowel rear peg Make slot Balsaleast 4- wide nose plug Laminated balsa nose block water-shrink dope lightweight modelsl Magic Markers thinly-sprayed model enamel OK color trim fact have built flown very few canards Eventually proper CG location found combined what seemed excessive amount angular difference between wing forward canard surface fairly large amount upthrust equivalent downthrust tractor configuration also found necessary adjustments Shinden demon strated exceptional flight performance sta bility lighter profile model built also larger built-up Rubber Scale model using same force arrangements original profile Lo behold built-in adjustments worked exactly profile very minor trimming required get both flying well Several other similar experiences have con vinced small profile models indeed provide accurate insight flight characteristics trim requirements larger built-up model Its simple fun way save time frustration take surprises out trimming large new beautiful Scale project might also steer away real dogs worth effort fight through flight trimming stages may have trimmed Free Flight Scale models before some procedures have found work pretty well certainly other ways go about trimming model tech niques may worth try start very easy profile model CG wing/stab angles idea determine combination C G wing tail angular difference provides just enough pitch up down stability dont want too much pitch stability will add unnecessary drag certainly cant get too little model wont fly general further forward CG greater stabilityand vice versa see Fig 1 want find point pitch stability disappears marginal move CG forward just little until adequate stability reappears First make absolutely sure flying surfaces straight free warps before testing Its surprising modelers experienced ones sometimes skip step After have determined surfaces true use modeling clay place CG point think should little rearward Keep rear hook prop bearing hole least 3116 V4 away motor stick rubber clearance 58 Model Aviation Figure 3Basic Consi Sturdy Simple S06 Plastic Prop ng sheet fuselage Hole Fuselage Motor Stick Motor stick Lightweight built-up fuselage thin sheet balsa Motor Tube fuselage builtMotor tube made 1164 1/32 sheet balsa rolled around dowel glued also can formed several layers tracing paper glued together Make tube di ameter least % Actually almost place between wing leading trailing edges will starter doubt place CG point one-third distance leading trailing edge Mark C G soft pencil can keep track have tested first tests somewhat easier remove propeller replace piece modeling clay equal weight models glide will better propeller changes want observe will easier see Leave prop isnt easy remove either put few turns rubber motor let free-wheel dont want thrust just want reduce drag prop during gliding tests first step gently glide model very few turns motor observe flight path During phase adjust elevator until get smooth descending glide Several glides trim setting will necessary make sure okay glide reasonably smooth continue Balance trim adjustments weird configurations like Blohm Voas BV141 ideal problema solving simple profiles felt-tip pen can wonders detailing otherwise plain all-sheet model mini Focke-Wuif Stosser shows benefits gliding model increasing speed until tossing harder ever would normal launch model tends zoom upward sharply loop too stable tends tuck nose under dive toward ground increased speeds unstable some quirk fate model continues shallow climb glides smoothly has small margin stability can proceed power tests Assuming model either zoomed upward dove ground move CG about ng modeling clay nose tail follows Move C G rearward clay tail bend elevator trailing edge down bit model zoomed upward Move CG forward clay nose bend elevator trailing edge up bit model dove After making C G incidence adjustments go back gentle launches Adjust elevator get smooth glide Repeat steps until have found CG remember marked time incidence combinations stable unstable use powered tests come next will just little forward marginally-stable point Table Fig 2 summarize process much clearly words Thrust line next step find proper thrust line angles Put very small amount rudder adjustment direction want flight path certain models clay weight wing tip works better rudder turn usually use left turn both power glide Once CG has established glide tests simply begin add more turns power flight tests proceed time use thrust angle changes get good power pattern adjustments pretty obvious cases point thrust line downward keep model zooming upward under first burst power point opposite direction Continued ~agc 143 August 1982 59 Rolfe Gregorys profile Wildcat simple impressive InuourImler Profiles easy build lots fun WW II airplanes like Hellcat tine tljers no LG clean lines have good duration help teach low-wing trimming sure etching well done slightest film copper will serve conductor high voltages resulting failure op-amp other high-voltage-sensitive parts Leads may pass using Teflon tubes 001 uF capacitors lead ground inside case ground RF needed external leads including trigger wires diodes around op-amp protect stray voltages lost two op-amps before diodes installed Herb WahI Hurleman-type plug has used over 50 hours great success low power engine relation cooling area 27 hours rich running made plug bit black still firing experimenting type spark system interests start coil can wind good coil rest relatively easy Good luck 15 mil wire will need Profiles/SruII Continued page 59 turn becomes too tight etc Use very small thrust changes degree two time since effect large under full power Dihedral angle tail area model cant made fly consistent circle either direction tightening its turn eventu ally diving probably have spiral stability problems especially common lowwing models little dihedral also appears some parasol configurations large vertical tail surfaces such Curtiss Junior case best remedy usually add dihedral abut two three degrees timeuntil problem subsides Another possible solution reduce vertical tail surface usually looks bad can also lead other stability problems Another tricky method worth try certain models add vertical side area above approximate CG position Walt Mooney sometimes does filling open cabane structure like Curtiss Junior has clear sheet thin plastic can hardly see it will sometimes trick another Walts models added large profile pilot figure otherwise empty cockpit added enough lateral area above CG low-wing model fly properly no dihedral Another problem occurs occasionally directional instability case model will tend wander direction somewhat will impossible adjust reliable turn pattern Unlike spiral stability problem men tioned above however model will tend spin fact directional wandering usually means model spirally stable simple cure difficulty increase vertical tail area find need large amount increase would spoil looks Scale creation can borrow another idea Walt Mooney add transparent tab vertical tail flight will hardly visible trying set CG incidence described earlier models flight path erratic pitch difficult get repeat able results horizontal tail surfaces may too small Add 20 30% horizontal tail area try again tinned page 144 COMPLETE THIS FOAM AND ATTACH MAILING LABEL FROM RECE NT E LET US KNOW WHERE YOU ARE GOING move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept. Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 Check appropriate boxenclose payment 0 NEW SUBSCRIPTION 0 CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US Possessions elsewhere Including Canada MexIco $2400 US Schools $gOO US Libraries $1350 NAME ADDRESS CITY/STATE _____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW WASHINGTON DC 20005 August1982 143 distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER II INC 16650 South 104th AVENUE ORLANO PARK ILLINOIS 60462 soon bringing result years military research testing Watch Full Command Systems 908 E Rosewood Spokane WA 99207 509 487-2112 Other peculiar trimming problems may arise weird scale configurations can cutand-try solve little profile test machine problems discussed above ever tend common ones Scale models Construction methods case want try hand constructing profile model favorite airplane few design building tips observed published models models of local flying comrades two basic structural approaches allsheet surfaces built-up tissue-covered sur faces see Fig 3 built-up tissue-covered models can built lighter all-sheet models fore have potentially higher flight perform ance usually used profiles intended primarily Indoor flying bit time consuming build although very simple tend somewhat fragile solid sheet counterparts All-sheet models usually built thin 1/16 1/64 sheet balsa although local club members have using thin sheet foam plastic 1/32 3/32 thickness sheet plastic sliced large blocks dense blue-colored foamthe kind often used building insulation some areas foam material extremely easy use profile models believe partly respon sible popularity profiles club foam lighter balsa much less expensive As added bonus virtually warp-proof Flying outdoors damp grass cool damp evenings can quickly turn conven tional balsa-and-tissue models useless pret zels unless lots dope other moisture Tired stamped sheet-metal flat glow plug wrenches find 4way cast-metal ones clumsy use Bee Twister answertO prayers handle carefully shaped com fortable fit hand design makes easy reach plug buried deep inside cowling compact tool fits easily field box wrench designed fit popular glow plugs including GbBees its attractive plastic handle proudly displays Gb Bee logo shaft steel Get local hobby shop product review product review product review 144 Model Aviation product review product review product review Shape Things Come Technology-2000 D Designed Full Command Systems Canadian governments target drone program Full Command has now brought cutting edge Radio Control Technology hobbiest shaped like Old Fashioned radios Full iand Systems will Bee Twister glow plug wrench No 4228 $300 GloBee Division Twinn-K Inc PO Box 31 228 India napolis IN 46231 4E*SE5a KITS 1/4 SCALE SEMI KIT13900 1/4 SCALE COMPLETE KIT. 19900 1/3 SCALE SEMI KIT16900 1/3 SCALE COMPLETE KIT.22900 PLEASE ADD $750 FOR SHIPPING i/4 3CALE SPAN 80 WEIGHT 201 ENGINE QUADRA 1/3 SCALE SPAN 106 WEIGHT 781 ENGINE QUADRA SEMI 51113 CONTAIN SAWED AND SANDED FORNERS WALL WING RIBS TIPS RUDDER AND STAB OUTLINED SIZE PLAPS CPLETE KItS CONTAIN THE ADOYR PARTS ALL PINE AND BALSA STRIP WOOD WARE SEND *1 00 FOR OUR OWIPLETE CATALOG PHDNE 1419 599-2121 proofer has used case all-sheet profile models very simple build can easily decorated felt-tip pens excellent projects begin ners just getting powered Free Flight models Holding motor prop Fig 4 shows three basic ways support rubber motor model 1 hole fuselage 2 motor stick 3 motor tube classic most-used scheme hole fuselage method best suited forthe all-sheet balsa model fuselage rigid enough support fully wound motor weaker construction used such very thin sheet balsa foam built-up structure motor stick motor tube will required support pull fully wound motor motor stick can simple piece 3/32 3/16 balsa very lightweight models can small rolled tube 1/32 1/64 balsa Ia Indoor practice rubber motor also can fully enclosed fairly large diameter tube built part fuselage Such motor tube should least -in diameter provide sutlicient clear ance unwinding rubber motor tube can made wrapping 1/32 1/64 balsa several layers paper around dowel Attaching prop Fig 5 shows different types prop bearings used motor sticks Remember trying new novel design allowance should made easy thrust-line adjustments fixed thrust bearings have cut off re-glued time thrust line changed sample proflle design build would like try practice profile model full-size plans provided 6-in-span version experimental Japanese Navy fighter Kyushu Shinden Construction built-up tissuecovered variety plans indicate CG. incidence thrust adjustments have worked models Flights over two minutes possible little bird Give try see can find other better trim settings Best luck new flight test tools FF Duration/Meuser Continued page 67 note Bill Bogart seems friend Bills dredged up report written Seredinsky both friend Seredinsky work ing Grumman So far have title page interior page Bill thought might find interesting shows airfoil cross sections labeled Modifications Airfoil Se 4410 first four sections original 1% LE radius modified version 3% nose radius turbulator wire ahead foil apparently something like sand stuck top surface over first 20% chord Number five now-familiar flamingo foil Also shown CL-vs-CD polars five sections derived model flight tests Reynolds-number range 45 000 tO 30000 Thtts live curves seem little /on smooth no experimental points arc shown makes feel little uneasy nevertheless. Worst hunch wis 3%-nose oh Ahie leg upwas un-modded Se 4410 1% nose came sandy surface mod original foil turbulator % diameter situated 7% ahead L E roughly 1% above bottom-surface chord line Best bunch flamingo its Hobby Shack RADIO RIOT BA 6 channel w/4 Ca 5-26 ser vos tull Ni Cd & char9er z9$16995 LIST $30995 5 channel w/4 ea S-26 ser vos dual rates full Ni-Cd LIST $27995 $15499 6 channel w/2dual rates 6 servos reversing switches 1ST $34995 U name3 U address cityU U statezip3 U mail order catalogs 18480 BANDILIER CIRCLE U FOUNTAIN VALLEY CA 928708 POSTAGE AND HANDLING CHARGES 3 $000 $2500 add $300 $2501 $5000 add $400 U Over $5000 add $500 California residents add 6% state sales tax mminmin August1982 145 kYShaCI CIRRUS I850 XLC system w/4 Lw OEft6N 649 APPIAN NAPOLEON OHIO 43545