Control Line Aerobatics Ted Fancher AS unfaithful husband said spouse Its best hear Fancher lied reasons arent germane two col umns handles stated pull both lines equal until full control deflection achieved simply isnt true face red soon saw print What should have said total tension both lines will always equal centrifugal force model As control inputs given line being pulled will assume larger share total larger share will equal alr loads flaps elevators transmitted leadouts through alrborne system sufficient mechanical advantage isnt built system entire load will taken individual line point airloads controls equal centrifugal force whether controls full deflection Fortunately foot-in-mouth fatal concepts discussed effects conclusions respect line displacement control feel still valid Only numbers. made whole cloth outset affected conceptual mis statement relates experimental han dle pivoted wrist hinge point would fact some control feel result overcoming air loads Please accept embarrassed apologies Control Line Stunt competition its very nature demanding leisure-time activities requires thorough understanding integration literally thousands bits pieces aerodynamic wisdom engine crafts manship skills neuromuscular coordina tion extremely high degree hours practice honing blending skills level competitiveness desired individual Because huge demand dedica tion part individual Stunt flying never hasand never willappealed masses just too simpler remunerative manufacturer amusements available TV addiction computer hacking Ill make no comment relative merits other activities except state easier avocation master greater participation both prac titioners suppliers Recognizing applaud dedication Stunt think takes special people unfortunate result small level participation equally small amount available user-friendly soft ware Unless have catalogued col lection last 40 years modeling magazinesor better yet live next door Werwage Giesekeaccess informed help designing building flying Stunt airplanes rare commodity Most us learn through repeated trial error. up month marks beginning very ambitious undertaking several years have piecemeal fashion tried share some design trim skills Ive learned course almost 30 years flying Stunt Some gifted builders fliers have over years appended construction articles good basic trim information however best knowledge no has yet undertaken comprehensive discussion Stunt model design development trim design phase through competition-ready what hope several succeeding columns have no idea long will go bear feel will learn Especially since verbalizing perceptions clarifies concepts own mind ition catalyzing response some less-supportive readers Believe Ive learned plenty format complex discussion such difficult develop What MPORTANT STUNT STUFF IILLUSTRATED CG APPX 16- 18%MAC C/LWINGSS% MAO NPOINTSEE TEXT LOCATION VARIES C/LTAILZS% MAO FLAP 15-20%V OFOHORODMACTAIL MACWING ING&ITCHIN1MCMENT CG TO C/LWING TAIL MOMENT COG TO O/LTAIL TAIL AREA 20-25%WING AREA May1985 67 Ive decided following four chronological phases trim put evaluation Design Phase wherein attempt assemble aero ContinuedL 160 Ted beginning series articles hopes shed some light very mysterious subect trimming Stunter desirabie fiying quaiities right youve got start Square Study drawing read column leading trailing edges does include area chines As turned out Paul did fly GEMChineEquipped Modelat WC plans develop idea Reports full Goulburn FE Sympos ium Report 29-page document including new wind-tunnel tests Stuttgart Martin Simons Power Model Trim Stan Hines Lost Wax Engine Casting Dave Sugden available New South Wales FF Society have left FE Champs Planbook 162 pages competitors biographical technical philosophical details together threeview plans also excellent purchase $1000 plus postage NSW FF So ciety Committe 50 Brown St St Peters NSW 2044 Australia responding advertisers mention read about Model Aviation CL Aerobatics/Fancher Continued page 67 dynamic components vehicle hope will fly manner desired B Preflight Phasewhat Large James Greenaway termed bench-trimming love letter published Stunt News wherein assembled airplane configured design parameters ie balance etc C Flying Phase wherein empirically evaluate suc cess earlier two phases make appropriate adjustments necessary D Post-Flight Phase wherein evalu ate subjective objective evidence planes performance Throughout four trim phases attempt optimize six major trim objec tives Stabilitydoes go its pointed constant attention does exit corners hard flat II Response ratedoes turn readily controllably III Line Tensionwhat causes good/bad line tension what about IV Speed Control too fast too slow adjust V Trackingdoes fly consecutive maneuvers concentrically does wander fix VI Turn equalitydoes turn equally both inside outside four phases trim six trim objectives plotted accompany ing table Beside objective variety design parameters inflight factors have effect partic ular objective listed approxi mately descending order influence phase trim parameter con sidered marked X exam ple Stability objective leadout location element Phases B C whereas sealing flap hinge line strictly flying trim consideration C Note addition table brok en down happy airplane side happy pilot side very important realize stated earlier columns handles handle interface between airplane pilot means whereby make properlytrimmed aircraft compatible differ ent pilots often difficult make distinction should kept constantly mind handle should nt adjusted camouflage what aircraft deficiency except last resort discussion will concentrate happy-airplane side comments happy pilot absolutely necessary Next month will start Phase Design Trim address parameters six Trim Objectives Subsequent columns will same succeeding phase few final comments order what assumptions have made plus few definitions terms First no attempt will made quan tify parameter will discussing concepts principles general specific terms ie lift-to-drag ratio improves higher aspect ratios L/D seven-to-one AR 137267% five-to-one AR etc will however provide some personal rules thumb hard numbers time S Send $100 Cash Check Stamps 32 Page Tabloid size illustrated DISCOUNT Catalog Sent 1st Class Mail COMET COX FLYLIN FOX GOLD3ERG GUILLOWS JETCO K&3 PACTRA PECK POLYMER PERFECT SIG- STERLING SULLIVAN TOP FLITE & OTHERS 1111 YALLET RUDDY CIIIfl 137 1 liii St Landau Fm 11146 leO ModelAviation ACCURATE ABLE TOREAD ACC U TAC H NOW IN TWO MODELS 3 FUNCTION4 FUNCTION ACCUSTACH 1ACCU-TACH 2 Digital8995 LCD tachometerSame useful capabilities has dual scale lOX-bOXas ACCU-TACH 1 stable RPM readoutincludes DC ammeter Full scale voltmeter canused check servo curbe used check/cyclerent Will find worn bindmost TXIRX battery com-ing stalled servo condi bos Reads loadtions w/SCA1 up 20 voltsAdd function ATi ACCESSORIESor SCAl -Servo Current Adaptor OSAl- Quarter Scale Adaptor ATi & AT2-500ma . 95 Airtronics Futaba Kraft 995 Send check MO NorCal AVIONICS IncINC P0 Box 70956 Sunnyvale CA 94086 Cahf add 6% tax Add $2 S&H See dealer first Old time Quality stiit I-LYLINfr Kit VOl9p. 5E9ISMM MPM 3-CbMORIl 0/C yd. PLACE AT TAR ENTER NATEERIALE$2195 FREE FLIANIT SCALE COSREETETIEN RICA AKit #103 MOORE WILE FROM TENS KIT TAlE MATAL VOWER nd 5O Phone 703 273-9593Flyline Models Catalog FLYLINE MODELS INC PO S. 2t3 Ffrf. Vh 121 USA EnI Parts Ofily have parts vntoty prompt dRIllveryi Over 23i itsmi Send *2W Out Current List time Recognize opin ions may shared promise wont get trou ble use will also assume systems ie engine tank weights leadouts etc adjustable Some just harder adjust others will assumed control sys tem has sufficient mechanical advantage overcome reasonably-encountered air loads controls Again con trol system requires extensive coverage its own merits will covered detail series However heres rule thumb Ted Modern full-size Stunters 35 60-powered should use minimum three-inch bellcrank 35 four inches strongly recommended Control horns should have flap-toelevator pushrod located inch flap horn variable 6 inch elevator bellcrank-to flap rod should least 75 pivot horn its location bellcrank should selected based preference control sensitivity Use 6 slow response much perhaps 1 / very fast response personally use 9 Finally since CL Stunters flown tethered wing tip can afford fairly casual treatment understanding roll yaw axes importance will largely confined discussion line tension n 6DGA DESIGNS Full Body Pilot KIt Lightest Pilot available oLIfelike vinyl la tex rubber parts Easy assemble finish Build either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable Some simple sewing required WeightPrice 1/6 Scale2oz*$ 795 1/4 Scale4oz$ 995 1/3Scale6oz*$1695 Weightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6Scale 75oz 1/4Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 Lightest bust pilot available Lifelike vinyl latex rubber parts GEasy assemble finish Build either barnstormer sportsman pilot Kit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send $100 current catalog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MD Allow 3 weeks check clearSorry-No COD 5 IJU ml itei U 3405 Cleveland Ave SW Canton ON 44707 Send$lforCafalag 4846810 RousH MFG May1985 161 CLEVELAND GIANTSI NEW FOR GIANTSALE BUFFS~ Worlds Largest Gas Plans Assortmp RNATIONALLY FAMOUS CO QUALITY MASTER MODELS PLANS 54rSDDnroisolle 21 $4 78Consol Cot P5Y5A $42 72 Cot 0201/4 LbS $46 04 Con Cot PEYSA $56 62 Hornord Roco lb $45 96 WrrgM-NooyRooe $48 77 Eonng 870 Port $35 52 W-Worsl2l 64 L $36 103 silo Fott $55 77W-W0,121 94 L $48 68 Doog O46A Gb. $32 84 pokbr D7 Pt$39. 108 Skor S30 Aropit $414 60 Hosnord Pet Rose $32 60 B 70 Soylo 00080 $32 90 5po 60 Sopetotorin S6B $24 90$ 89 Sop~o~no 066 $32 80 Mortn 74 TAM1 $29 62 Cort Ooatk P69 $42 70 HP0 0400 Eoorb $42 94 CotHook P6E Ftr $54 104 HPg 0400 Boor $36 62 LookIred V80$24 65 MChroo Clip9 $55 74 Doolittlns GE 11 $48r 97 M95 Monooospo Sport $26 60 W 80 Ho1t Opt ElIdog $43 60 Ry 107 Aeronoo C2 Opt $25 60E 61 00500 038 Gb $32 77 122 Dooglos 038Gb $49 73 N M air Bomb $49 94 P090 CotI 800, $45 65 M Mo oodo 626 $49 71 Mortmo $10 Eoorb 029 8 09 Monqro Bk $42 78 Tooters WW Ran $35 10809 Mooqo Eonb $55 f $3 Cotr Gofrk P1 1C2 542 90 Steo PT lKoydet $36 r Goohk FttC2 $54r 99 N 06 DHoo Conrot Ros 526 71 $ * 62 HnonMMolljgor03$95 0 94 HosoM MolligonS4$06 H 63 Bo,rg P20A Pt826108 84 Boeing P26A Pt$48 60 Doog 00 M 2 Mo024 69Wooo C6 Cohin$3668 8 00 Bol dog Pt520 64 $eeoh C17B Slog$26$96 oonnRoooML A05444 96 5,h C17B Slog $49 1070 rn Boo PEP $94 5$ Look 11 Elootto $30 737 ovol 0000 $24 82 Look 1 EIorro 840 107 Mo 1MB Eon $44 62 SImon 7 W SR7 51691 Lirdbe go NO 211$39 81 Stioson T W 597 $24ISO P0 cIt PTI9T$29 l22StiooooT WSR7$3890W $9 Brintal Pt F2B $2075W 78 Bristol Pt P26 $32100 118 Bristol Ftr P2E $4557 Ford Trirot 4AT$20 74 TL Pesoo Spen $45 76 Ford Tonrtr 4AT84$ 63 Skyrooknt XPSP1 $20114 Pod Triort4AT$59* $6 Cot Wotirk P40 12484 BrIJoyne OPJ2$56 78 Look Light8 P38 12893 bering C2Arnpfr$69 26 Rep SeoB. Anr $5458 GrornJ2P Doob$39 74 RepSeoB Aroph $3978 GronrJ2P Dook$$6 . 106 Pipet J3 Cob $29- 590Bo 98 Look Hodoon 8ob $38117Bo 63 Gron P6P Helloot $2668 B 90 09 02 Tian Moth 539i $4 C Sold Oho SeolersPot oob1nat toohongo Goer 1200 GrIt, 6 73 Potts Intl SOt Up Add 10% oil otdets shipping & 0 eta is. SSACon&MenElsesnherito 15%125%ifbyoirl oriol notolog $200 inolodno Pho Listl Pioe jot onation alone $100 air foreign odd $100 CLEVELAND MODEL & SUPPLY Co 00W*ettpAOKOCsOOIOtiOts5 nest SC OtiS.- ONCE Ct 19307B DETROIT AVE CLEVELAND 01410 4402 Pflo,Sr 1030 torOSOor,0000 3600tL4 PREPARAFlON FORIKEINSCUSSION NOT FcOTBqLL PCEITHL CLUB 15 GOING TO DISCUI5S MUFFLER PULE5 AT . TON IGHT5 MEETING will like building flying version BD-4 Homebuiltl Balsa ply & foam construction 64 span 640 sq area 40- 60 two four cyci 0 MICROMARKS EXCLUSIVE 31 FLEX SHAFT TURNS ANY DREMEL MOTOTOOL INTO FLEXIBLE SHAFT MACHINE INSTANTLY LIGHTWEIGHT SUPER FLEXIBLE COMFORTABLE PEN-SIZE HANOPIECE lets work tight spots ACCEPTS ALL DREMEL ACCESSORIES AND DRILL BITS #800135thru 1/n ______ INCLUDES 4 PRECISION COLLETS AND ANGLE WRENCH Has precision bronze bearings Runs speeds up 20000 RPM #6 dial setting Dremel variable speed models 350 370 & 380 HOW TO ORDER Simply send name address & order MICROMARK Box 5112-4724 E Main St. Clinton NJ 08809 Enclose check money order $1495 Flex Shaft #14260 plus $200 insured delivery USA Moto-Tool Holder #14261 $395 postpaid purchased Flex Shaft COO add $200 per order VISA MASTER-CARD AMEX enclose account number exp date signature CALL TOLL FREE 800-225-1066 NJ 201 -464-6764 48-page tool catalog $100 FREE order pitch axis other hand para mount importance inasmuch maneuvers accomplished through vari ous rates directions pitch change will therefore consider pitch detail So talking same lan guage lets define some terms will recur throughout series First MAC Mean Aerodynamic Chord robot chord 13 tip chord 9 MAC will station wing span chord length 11 MAC technically slightly dif ferent average chord can purposes assume equal colocated MAC important since parameters discuss will refer enced position MAC Also remember tail merely smaller lifting surface therefore exhibits same aerodynamic characteristics wing including MAC CG Center Gravity important recognize CG point about outside force OUR OWN LOW COST MOTO-TOOL HOLDER ONLY $39Sppd purchased FLEX SHAFT Belt clamp werkhench wall USE WITh OUR FLEX SHAFT will act ie thrust drag lift etc Since true force momentsie tail moments pitching moments etcwill defined distance CG last differs historical Stunt practice measuring tail moments hingeline hingeline useless exercise unless comparing otherwise iden tical wing tail planforms Fore aft CG will spoken terms its location MAC CG located 15 inches leading edge 10-inch MAC 15e MAC recognized vertical spanwise location CG probably wont located defined must recognize divergences minor significant affecting pitch C/L Center Lift point MAC wings lift concen trated symmetrical airfoils C/L located 25 e MAC moves some what aft airfoil cambered deflected flaps Lift generated wing tail act respective C/Ls develop moment about CG system works just like parkyard teeter-totter force lift applied given distance fulcrum CG turning movement pitching results Aspect Ratio AR measure relationship wings span its area average chord simple tapered wings shape wings planform top view much cosmetic interest As aspect ratios get larger longer spans given area wing becomes efficient terms lift produced compared drag developed can both good bad will learn C1 Coefficient Lift nondimensional number no real value such inches pounds sex appeal etc reflects relative amount lift airfoil section generates under given set conditions Some general state ments concerning C1 given airfoil will increase increase air speed increase angle attack up point stall airflow sepa rates wings surface lift rapidly drops zero. rare occurrence competitive Stunt ship angle attack increases C1 will increase faster rate high aspect-ratios low Maximum C1 will roughly same both high low aspect ratio however low aspect ratios require higher angles attack same C1 generate greater drag per unit lift Last ly high aspect ratios stall lesser angles attack low Whew think sets stage Next month well dive right design phase see what sort options have developing Stunter thatll per form expectations Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 CL Scale/Boss Continued page 68 color chart listing military scale col ors made Hobbypoxy paints write Hobbypoxy Products Division Pettit Paint Company Inc 36 Pine St PO Continued page 164 WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE IROWNTEL CO A-n PEANUT$3595STANDARD TELCO$2495 CAMPUS BEE$3495TURBO 3000$3295 CAMPUS TWiN$5955TURBO 000093696 SODA CHARGER -$1295 DAVIS- COX 02CONVERSION TO CO-2$2995 NEW CATALOL No25 $150 S.LD*Imjm*me PHONE 619442-4936 UUR6W67WUUW 1019 469-6615 W BOX 2498-MA DIVISION OF BAR/RICH SALES CO 62 FAIRWAY HANNIBAL MO 63401 13141 221-8803 aster FACTURERS OF SPORT PATTERNSTINGER II PEPPERMINT PATTIE 60SPARTAN PEPPERMINT PATTIE 40SPORT/SCALE PEPPERMINT PATTIE 15HIPERBIPE 162 ModelAviation ANOTHER GREAT VALUE
Edition: Model Aviation - 1985/05
Page Numbers: 67, 160, 161, 162
Control Line Aerobatics Ted Fancher AS unfaithful husband said spouse Its best hear Fancher lied reasons arent germane two col umns handles stated pull both lines equal until full control deflection achieved simply isnt true face red soon saw print What should have said total tension both lines will always equal centrifugal force model As control inputs given line being pulled will assume larger share total larger share will equal alr loads flaps elevators transmitted leadouts through alrborne system sufficient mechanical advantage isnt built system entire load will taken individual line point airloads controls equal centrifugal force whether controls full deflection Fortunately foot-in-mouth fatal concepts discussed effects conclusions respect line displacement control feel still valid Only numbers. made whole cloth outset affected conceptual mis statement relates experimental han dle pivoted wrist hinge point would fact some control feel result overcoming air loads Please accept embarrassed apologies Control Line Stunt competition its very nature demanding leisure-time activities requires thorough understanding integration literally thousands bits pieces aerodynamic wisdom engine crafts manship skills neuromuscular coordina tion extremely high degree hours practice honing blending skills level competitiveness desired individual Because huge demand dedica tion part individual Stunt flying never hasand never willappealed masses just too simpler remunerative manufacturer amusements available TV addiction computer hacking Ill make no comment relative merits other activities except state easier avocation master greater participation both prac titioners suppliers Recognizing applaud dedication Stunt think takes special people unfortunate result small level participation equally small amount available user-friendly soft ware Unless have catalogued col lection last 40 years modeling magazinesor better yet live next door Werwage Giesekeaccess informed help designing building flying Stunt airplanes rare commodity Most us learn through repeated trial error. up month marks beginning very ambitious undertaking several years have piecemeal fashion tried share some design trim skills Ive learned course almost 30 years flying Stunt Some gifted builders fliers have over years appended construction articles good basic trim information however best knowledge no has yet undertaken comprehensive discussion Stunt model design development trim design phase through competition-ready what hope several succeeding columns have no idea long will go bear feel will learn Especially since verbalizing perceptions clarifies concepts own mind ition catalyzing response some less-supportive readers Believe Ive learned plenty format complex discussion such difficult develop What MPORTANT STUNT STUFF IILLUSTRATED CG APPX 16- 18%MAC C/LWINGSS% MAO NPOINTSEE TEXT LOCATION VARIES C/LTAILZS% MAO FLAP 15-20%V OFOHORODMACTAIL MACWING ING&ITCHIN1MCMENT CG TO C/LWING TAIL MOMENT COG TO O/LTAIL TAIL AREA 20-25%WING AREA May1985 67 Ive decided following four chronological phases trim put evaluation Design Phase wherein attempt assemble aero ContinuedL 160 Ted beginning series articles hopes shed some light very mysterious subect trimming Stunter desirabie fiying quaiities right youve got start Square Study drawing read column leading trailing edges does include area chines As turned out Paul did fly GEMChineEquipped Modelat WC plans develop idea Reports full Goulburn FE Sympos ium Report 29-page document including new wind-tunnel tests Stuttgart Martin Simons Power Model Trim Stan Hines Lost Wax Engine Casting Dave Sugden available New South Wales FF Society have left FE Champs Planbook 162 pages competitors biographical technical philosophical details together threeview plans also excellent purchase $1000 plus postage NSW FF So ciety Committe 50 Brown St St Peters NSW 2044 Australia responding advertisers mention read about Model Aviation CL Aerobatics/Fancher Continued page 67 dynamic components vehicle hope will fly manner desired B Preflight Phasewhat Large James Greenaway termed bench-trimming love letter published Stunt News wherein assembled airplane configured design parameters ie balance etc C Flying Phase wherein empirically evaluate suc cess earlier two phases make appropriate adjustments necessary D Post-Flight Phase wherein evalu ate subjective objective evidence planes performance Throughout four trim phases attempt optimize six major trim objec tives Stabilitydoes go its pointed constant attention does exit corners hard flat II Response ratedoes turn readily controllably III Line Tensionwhat causes good/bad line tension what about IV Speed Control too fast too slow adjust V Trackingdoes fly consecutive maneuvers concentrically does wander fix VI Turn equalitydoes turn equally both inside outside four phases trim six trim objectives plotted accompany ing table Beside objective variety design parameters inflight factors have effect partic ular objective listed approxi mately descending order influence phase trim parameter con sidered marked X exam ple Stability objective leadout location element Phases B C whereas sealing flap hinge line strictly flying trim consideration C Note addition table brok en down happy airplane side happy pilot side very important realize stated earlier columns handles handle interface between airplane pilot means whereby make properlytrimmed aircraft compatible differ ent pilots often difficult make distinction should kept constantly mind handle should nt adjusted camouflage what aircraft deficiency except last resort discussion will concentrate happy-airplane side comments happy pilot absolutely necessary Next month will start Phase Design Trim address parameters six Trim Objectives Subsequent columns will same succeeding phase few final comments order what assumptions have made plus few definitions terms First no attempt will made quan tify parameter will discussing concepts principles general specific terms ie lift-to-drag ratio improves higher aspect ratios L/D seven-to-one AR 137267% five-to-one AR etc will however provide some personal rules thumb hard numbers time S Send $100 Cash Check Stamps 32 Page Tabloid size illustrated DISCOUNT Catalog Sent 1st Class Mail COMET COX FLYLIN FOX GOLD3ERG GUILLOWS JETCO K&3 PACTRA PECK POLYMER PERFECT SIG- STERLING SULLIVAN TOP FLITE & OTHERS 1111 YALLET RUDDY CIIIfl 137 1 liii St Landau Fm 11146 leO ModelAviation ACCURATE ABLE TOREAD ACC U TAC H NOW IN TWO MODELS 3 FUNCTION4 FUNCTION ACCUSTACH 1ACCU-TACH 2 Digital8995 LCD tachometerSame useful capabilities has dual scale lOX-bOXas ACCU-TACH 1 stable RPM readoutincludes DC ammeter Full scale voltmeter canused check servo curbe used check/cyclerent Will find worn bindmost TXIRX battery com-ing stalled servo condi bos Reads loadtions w/SCA1 up 20 voltsAdd function ATi ACCESSORIESor SCAl -Servo Current Adaptor OSAl- Quarter Scale Adaptor ATi & AT2-500ma . 95 Airtronics Futaba Kraft 995 Send check MO NorCal AVIONICS IncINC P0 Box 70956 Sunnyvale CA 94086 Cahf add 6% tax Add $2 S&H See dealer first Old time Quality stiit I-LYLINfr Kit VOl9p. 5E9ISMM MPM 3-CbMORIl 0/C yd. PLACE AT TAR ENTER NATEERIALE$2195 FREE FLIANIT SCALE COSREETETIEN RICA AKit #103 MOORE WILE FROM TENS KIT TAlE MATAL VOWER nd 5O Phone 703 273-9593Flyline Models Catalog FLYLINE MODELS INC PO S. 2t3 Ffrf. Vh 121 USA EnI Parts Ofily have parts vntoty prompt dRIllveryi Over 23i itsmi Send *2W Out Current List time Recognize opin ions may shared promise wont get trou ble use will also assume systems ie engine tank weights leadouts etc adjustable Some just harder adjust others will assumed control sys tem has sufficient mechanical advantage overcome reasonably-encountered air loads controls Again con trol system requires extensive coverage its own merits will covered detail series However heres rule thumb Ted Modern full-size Stunters 35 60-powered should use minimum three-inch bellcrank 35 four inches strongly recommended Control horns should have flap-toelevator pushrod located inch flap horn variable 6 inch elevator bellcrank-to flap rod should least 75 pivot horn its location bellcrank should selected based preference control sensitivity Use 6 slow response much perhaps 1 / very fast response personally use 9 Finally since CL Stunters flown tethered wing tip can afford fairly casual treatment understanding roll yaw axes importance will largely confined discussion line tension n 6DGA DESIGNS Full Body Pilot KIt Lightest Pilot available oLIfelike vinyl la tex rubber parts Easy assemble finish Build either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable Some simple sewing required WeightPrice 1/6 Scale2oz*$ 795 1/4 Scale4oz$ 995 1/3Scale6oz*$1695 Weightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6Scale 75oz 1/4Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 Lightest bust pilot available Lifelike vinyl latex rubber parts GEasy assemble finish Build either barnstormer sportsman pilot Kit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send $100 current catalog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MD Allow 3 weeks check clearSorry-No COD 5 IJU ml itei U 3405 Cleveland Ave SW Canton ON 44707 Send$lforCafalag 4846810 RousH MFG May1985 161 CLEVELAND GIANTSI NEW FOR GIANTSALE BUFFS~ Worlds Largest Gas Plans Assortmp RNATIONALLY FAMOUS CO QUALITY MASTER MODELS PLANS 54rSDDnroisolle 21 $4 78Consol Cot P5Y5A $42 72 Cot 0201/4 LbS $46 04 Con Cot PEYSA $56 62 Hornord Roco lb $45 96 WrrgM-NooyRooe $48 77 Eonng 870 Port $35 52 W-Worsl2l 64 L $36 103 silo Fott $55 77W-W0,121 94 L $48 68 Doog O46A Gb. $32 84 pokbr D7 Pt$39. 108 Skor S30 Aropit $414 60 Hosnord Pet Rose $32 60 B 70 Soylo 00080 $32 90 5po 60 Sopetotorin S6B $24 90$ 89 Sop~o~no 066 $32 80 Mortn 74 TAM1 $29 62 Cort Ooatk P69 $42 70 HP0 0400 Eoorb $42 94 CotHook P6E Ftr $54 104 HPg 0400 Boor $36 62 LookIred V80$24 65 MChroo Clip9 $55 74 Doolittlns GE 11 $48r 97 M95 Monooospo Sport $26 60 W 80 Ho1t Opt ElIdog $43 60 Ry 107 Aeronoo C2 Opt $25 60E 61 00500 038 Gb $32 77 122 Dooglos 038Gb $49 73 N M air Bomb $49 94 P090 CotI 800, $45 65 M Mo oodo 626 $49 71 Mortmo $10 Eoorb 029 8 09 Monqro Bk $42 78 Tooters WW Ran $35 10809 Mooqo Eonb $55 f $3 Cotr Gofrk P1 1C2 542 90 Steo PT lKoydet $36 r Goohk FttC2 $54r 99 N 06 DHoo Conrot Ros 526 71 $ * 62 HnonMMolljgor03$95 0 94 HosoM MolligonS4$06 H 63 Bo,rg P20A Pt826108 84 Boeing P26A Pt$48 60 Doog 00 M 2 Mo024 69Wooo C6 Cohin$3668 8 00 Bol dog Pt520 64 $eeoh C17B Slog$26$96 oonnRoooML A05444 96 5,h C17B Slog $49 1070 rn Boo PEP $94 5$ Look 11 Elootto $30 737 ovol 0000 $24 82 Look 1 EIorro 840 107 Mo 1MB Eon $44 62 SImon 7 W SR7 51691 Lirdbe go NO 211$39 81 Stioson T W 597 $24ISO P0 cIt PTI9T$29 l22StiooooT WSR7$3890W $9 Brintal Pt F2B $2075W 78 Bristol Pt P26 $32100 118 Bristol Ftr P2E $4557 Ford Trirot 4AT$20 74 TL Pesoo Spen $45 76 Ford Tonrtr 4AT84$ 63 Skyrooknt XPSP1 $20114 Pod Triort4AT$59* $6 Cot Wotirk P40 12484 BrIJoyne OPJ2$56 78 Look Light8 P38 12893 bering C2Arnpfr$69 26 Rep SeoB. Anr $5458 GrornJ2P Doob$39 74 RepSeoB Aroph $3978 GronrJ2P Dook$$6 . 106 Pipet J3 Cob $29- 590Bo 98 Look Hodoon 8ob $38117Bo 63 Gron P6P Helloot $2668 B 90 09 02 Tian Moth 539i $4 C Sold Oho SeolersPot oob1nat toohongo Goer 1200 GrIt, 6 73 Potts Intl SOt Up Add 10% oil otdets shipping & 0 eta is. SSACon&MenElsesnherito 15%125%ifbyoirl oriol notolog $200 inolodno Pho Listl Pioe jot onation alone $100 air foreign odd $100 CLEVELAND MODEL & SUPPLY Co 00W*ettpAOKOCsOOIOtiOts5 nest SC OtiS.- ONCE Ct 19307B DETROIT AVE CLEVELAND 01410 4402 Pflo,Sr 1030 torOSOor,0000 3600tL4 PREPARAFlON FORIKEINSCUSSION NOT FcOTBqLL PCEITHL CLUB 15 GOING TO DISCUI5S MUFFLER PULE5 AT . TON IGHT5 MEETING will like building flying version BD-4 Homebuiltl Balsa ply & foam construction 64 span 640 sq area 40- 60 two four cyci 0 MICROMARKS EXCLUSIVE 31 FLEX SHAFT TURNS ANY DREMEL MOTOTOOL INTO FLEXIBLE SHAFT MACHINE INSTANTLY LIGHTWEIGHT SUPER FLEXIBLE COMFORTABLE PEN-SIZE HANOPIECE lets work tight spots ACCEPTS ALL DREMEL ACCESSORIES AND DRILL BITS #800135thru 1/n ______ INCLUDES 4 PRECISION COLLETS AND ANGLE WRENCH Has precision bronze bearings Runs speeds up 20000 RPM #6 dial setting Dremel variable speed models 350 370 & 380 HOW TO ORDER Simply send name address & order MICROMARK Box 5112-4724 E Main St. Clinton NJ 08809 Enclose check money order $1495 Flex Shaft #14260 plus $200 insured delivery USA Moto-Tool Holder #14261 $395 postpaid purchased Flex Shaft COO add $200 per order VISA MASTER-CARD AMEX enclose account number exp date signature CALL TOLL FREE 800-225-1066 NJ 201 -464-6764 48-page tool catalog $100 FREE order pitch axis other hand para mount importance inasmuch maneuvers accomplished through vari ous rates directions pitch change will therefore consider pitch detail So talking same lan guage lets define some terms will recur throughout series First MAC Mean Aerodynamic Chord robot chord 13 tip chord 9 MAC will station wing span chord length 11 MAC technically slightly dif ferent average chord can purposes assume equal colocated MAC important since parameters discuss will refer enced position MAC Also remember tail merely smaller lifting surface therefore exhibits same aerodynamic characteristics wing including MAC CG Center Gravity important recognize CG point about outside force OUR OWN LOW COST MOTO-TOOL HOLDER ONLY $39Sppd purchased FLEX SHAFT Belt clamp werkhench wall USE WITh OUR FLEX SHAFT will act ie thrust drag lift etc Since true force momentsie tail moments pitching moments etcwill defined distance CG last differs historical Stunt practice measuring tail moments hingeline hingeline useless exercise unless comparing otherwise iden tical wing tail planforms Fore aft CG will spoken terms its location MAC CG located 15 inches leading edge 10-inch MAC 15e MAC recognized vertical spanwise location CG probably wont located defined must recognize divergences minor significant affecting pitch C/L Center Lift point MAC wings lift concen trated symmetrical airfoils C/L located 25 e MAC moves some what aft airfoil cambered deflected flaps Lift generated wing tail act respective C/Ls develop moment about CG system works just like parkyard teeter-totter force lift applied given distance fulcrum CG turning movement pitching results Aspect Ratio AR measure relationship wings span its area average chord simple tapered wings shape wings planform top view much cosmetic interest As aspect ratios get larger longer spans given area wing becomes efficient terms lift produced compared drag developed can both good bad will learn C1 Coefficient Lift nondimensional number no real value such inches pounds sex appeal etc reflects relative amount lift airfoil section generates under given set conditions Some general state ments concerning C1 given airfoil will increase increase air speed increase angle attack up point stall airflow sepa rates wings surface lift rapidly drops zero. rare occurrence competitive Stunt ship angle attack increases C1 will increase faster rate high aspect-ratios low Maximum C1 will roughly same both high low aspect ratio however low aspect ratios require higher angles attack same C1 generate greater drag per unit lift Last ly high aspect ratios stall lesser angles attack low Whew think sets stage Next month well dive right design phase see what sort options have developing Stunter thatll per form expectations Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 CL Scale/Boss Continued page 68 color chart listing military scale col ors made Hobbypoxy paints write Hobbypoxy Products Division Pettit Paint Company Inc 36 Pine St PO Continued page 164 WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE IROWNTEL CO A-n PEANUT$3595STANDARD TELCO$2495 CAMPUS BEE$3495TURBO 3000$3295 CAMPUS TWiN$5955TURBO 000093696 SODA CHARGER -$1295 DAVIS- COX 02CONVERSION TO CO-2$2995 NEW CATALOL No25 $150 S.LD*Imjm*me PHONE 619442-4936 UUR6W67WUUW 1019 469-6615 W BOX 2498-MA DIVISION OF BAR/RICH SALES CO 62 FAIRWAY HANNIBAL MO 63401 13141 221-8803 aster FACTURERS OF SPORT PATTERNSTINGER II PEPPERMINT PATTIE 60SPARTAN PEPPERMINT PATTIE 40SPORT/SCALE PEPPERMINT PATTIE 15HIPERBIPE 162 ModelAviation ANOTHER GREAT VALUE
Edition: Model Aviation - 1985/05
Page Numbers: 67, 160, 161, 162
Control Line Aerobatics Ted Fancher AS unfaithful husband said spouse Its best hear Fancher lied reasons arent germane two col umns handles stated pull both lines equal until full control deflection achieved simply isnt true face red soon saw print What should have said total tension both lines will always equal centrifugal force model As control inputs given line being pulled will assume larger share total larger share will equal alr loads flaps elevators transmitted leadouts through alrborne system sufficient mechanical advantage isnt built system entire load will taken individual line point airloads controls equal centrifugal force whether controls full deflection Fortunately foot-in-mouth fatal concepts discussed effects conclusions respect line displacement control feel still valid Only numbers. made whole cloth outset affected conceptual mis statement relates experimental han dle pivoted wrist hinge point would fact some control feel result overcoming air loads Please accept embarrassed apologies Control Line Stunt competition its very nature demanding leisure-time activities requires thorough understanding integration literally thousands bits pieces aerodynamic wisdom engine crafts manship skills neuromuscular coordina tion extremely high degree hours practice honing blending skills level competitiveness desired individual Because huge demand dedica tion part individual Stunt flying never hasand never willappealed masses just too simpler remunerative manufacturer amusements available TV addiction computer hacking Ill make no comment relative merits other activities except state easier avocation master greater participation both prac titioners suppliers Recognizing applaud dedication Stunt think takes special people unfortunate result small level participation equally small amount available user-friendly soft ware Unless have catalogued col lection last 40 years modeling magazinesor better yet live next door Werwage Giesekeaccess informed help designing building flying Stunt airplanes rare commodity Most us learn through repeated trial error. up month marks beginning very ambitious undertaking several years have piecemeal fashion tried share some design trim skills Ive learned course almost 30 years flying Stunt Some gifted builders fliers have over years appended construction articles good basic trim information however best knowledge no has yet undertaken comprehensive discussion Stunt model design development trim design phase through competition-ready what hope several succeeding columns have no idea long will go bear feel will learn Especially since verbalizing perceptions clarifies concepts own mind ition catalyzing response some less-supportive readers Believe Ive learned plenty format complex discussion such difficult develop What MPORTANT STUNT STUFF IILLUSTRATED CG APPX 16- 18%MAC C/LWINGSS% MAO NPOINTSEE TEXT LOCATION VARIES C/LTAILZS% MAO FLAP 15-20%V OFOHORODMACTAIL MACWING ING&ITCHIN1MCMENT CG TO C/LWING TAIL MOMENT COG TO O/LTAIL TAIL AREA 20-25%WING AREA May1985 67 Ive decided following four chronological phases trim put evaluation Design Phase wherein attempt assemble aero ContinuedL 160 Ted beginning series articles hopes shed some light very mysterious subect trimming Stunter desirabie fiying quaiities right youve got start Square Study drawing read column leading trailing edges does include area chines As turned out Paul did fly GEMChineEquipped Modelat WC plans develop idea Reports full Goulburn FE Sympos ium Report 29-page document including new wind-tunnel tests Stuttgart Martin Simons Power Model Trim Stan Hines Lost Wax Engine Casting Dave Sugden available New South Wales FF Society have left FE Champs Planbook 162 pages competitors biographical technical philosophical details together threeview plans also excellent purchase $1000 plus postage NSW FF So ciety Committe 50 Brown St St Peters NSW 2044 Australia responding advertisers mention read about Model Aviation CL Aerobatics/Fancher Continued page 67 dynamic components vehicle hope will fly manner desired B Preflight Phasewhat Large James Greenaway termed bench-trimming love letter published Stunt News wherein assembled airplane configured design parameters ie balance etc C Flying Phase wherein empirically evaluate suc cess earlier two phases make appropriate adjustments necessary D Post-Flight Phase wherein evalu ate subjective objective evidence planes performance Throughout four trim phases attempt optimize six major trim objec tives Stabilitydoes go its pointed constant attention does exit corners hard flat II Response ratedoes turn readily controllably III Line Tensionwhat causes good/bad line tension what about IV Speed Control too fast too slow adjust V Trackingdoes fly consecutive maneuvers concentrically does wander fix VI Turn equalitydoes turn equally both inside outside four phases trim six trim objectives plotted accompany ing table Beside objective variety design parameters inflight factors have effect partic ular objective listed approxi mately descending order influence phase trim parameter con sidered marked X exam ple Stability objective leadout location element Phases B C whereas sealing flap hinge line strictly flying trim consideration C Note addition table brok en down happy airplane side happy pilot side very important realize stated earlier columns handles handle interface between airplane pilot means whereby make properlytrimmed aircraft compatible differ ent pilots often difficult make distinction should kept constantly mind handle should nt adjusted camouflage what aircraft deficiency except last resort discussion will concentrate happy-airplane side comments happy pilot absolutely necessary Next month will start Phase Design Trim address parameters six Trim Objectives Subsequent columns will same succeeding phase few final comments order what assumptions have made plus few definitions terms First no attempt will made quan tify parameter will discussing concepts principles general specific terms ie lift-to-drag ratio improves higher aspect ratios L/D seven-to-one AR 137267% five-to-one AR etc will however provide some personal rules thumb hard numbers time S Send $100 Cash Check Stamps 32 Page Tabloid size illustrated DISCOUNT Catalog Sent 1st Class Mail COMET COX FLYLIN FOX GOLD3ERG GUILLOWS JETCO K&3 PACTRA PECK POLYMER PERFECT SIG- STERLING SULLIVAN TOP FLITE & OTHERS 1111 YALLET RUDDY CIIIfl 137 1 liii St Landau Fm 11146 leO ModelAviation ACCURATE ABLE TOREAD ACC U TAC H NOW IN TWO MODELS 3 FUNCTION4 FUNCTION ACCUSTACH 1ACCU-TACH 2 Digital8995 LCD tachometerSame useful capabilities has dual scale lOX-bOXas ACCU-TACH 1 stable RPM readoutincludes DC ammeter Full scale voltmeter canused check servo curbe used check/cyclerent Will find worn bindmost TXIRX battery com-ing stalled servo condi bos Reads loadtions w/SCA1 up 20 voltsAdd function ATi ACCESSORIESor SCAl -Servo Current Adaptor OSAl- Quarter Scale Adaptor ATi & AT2-500ma . 95 Airtronics Futaba Kraft 995 Send check MO NorCal AVIONICS IncINC P0 Box 70956 Sunnyvale CA 94086 Cahf add 6% tax Add $2 S&H See dealer first Old time Quality stiit I-LYLINfr Kit VOl9p. 5E9ISMM MPM 3-CbMORIl 0/C yd. PLACE AT TAR ENTER NATEERIALE$2195 FREE FLIANIT SCALE COSREETETIEN RICA AKit #103 MOORE WILE FROM TENS KIT TAlE MATAL VOWER nd 5O Phone 703 273-9593Flyline Models Catalog FLYLINE MODELS INC PO S. 2t3 Ffrf. Vh 121 USA EnI Parts Ofily have parts vntoty prompt dRIllveryi Over 23i itsmi Send *2W Out Current List time Recognize opin ions may shared promise wont get trou ble use will also assume systems ie engine tank weights leadouts etc adjustable Some just harder adjust others will assumed control sys tem has sufficient mechanical advantage overcome reasonably-encountered air loads controls Again con trol system requires extensive coverage its own merits will covered detail series However heres rule thumb Ted Modern full-size Stunters 35 60-powered should use minimum three-inch bellcrank 35 four inches strongly recommended Control horns should have flap-toelevator pushrod located inch flap horn variable 6 inch elevator bellcrank-to flap rod should least 75 pivot horn its location bellcrank should selected based preference control sensitivity Use 6 slow response much perhaps 1 / very fast response personally use 9 Finally since CL Stunters flown tethered wing tip can afford fairly casual treatment understanding roll yaw axes importance will largely confined discussion line tension n 6DGA DESIGNS Full Body Pilot KIt Lightest Pilot available oLIfelike vinyl la tex rubber parts Easy assemble finish Build either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable Some simple sewing required WeightPrice 1/6 Scale2oz*$ 795 1/4 Scale4oz$ 995 1/3Scale6oz*$1695 Weightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6Scale 75oz 1/4Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 Lightest bust pilot available Lifelike vinyl latex rubber parts GEasy assemble finish Build either barnstormer sportsman pilot Kit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send $100 current catalog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MD Allow 3 weeks check clearSorry-No COD 5 IJU ml itei U 3405 Cleveland Ave SW Canton ON 44707 Send$lforCafalag 4846810 RousH MFG May1985 161 CLEVELAND GIANTSI NEW FOR GIANTSALE BUFFS~ Worlds Largest Gas Plans Assortmp RNATIONALLY FAMOUS CO QUALITY MASTER MODELS PLANS 54rSDDnroisolle 21 $4 78Consol Cot P5Y5A $42 72 Cot 0201/4 LbS $46 04 Con Cot PEYSA $56 62 Hornord Roco lb $45 96 WrrgM-NooyRooe $48 77 Eonng 870 Port $35 52 W-Worsl2l 64 L $36 103 silo Fott $55 77W-W0,121 94 L $48 68 Doog O46A Gb. $32 84 pokbr D7 Pt$39. 108 Skor S30 Aropit $414 60 Hosnord Pet Rose $32 60 B 70 Soylo 00080 $32 90 5po 60 Sopetotorin S6B $24 90$ 89 Sop~o~no 066 $32 80 Mortn 74 TAM1 $29 62 Cort Ooatk P69 $42 70 HP0 0400 Eoorb $42 94 CotHook P6E Ftr $54 104 HPg 0400 Boor $36 62 LookIred V80$24 65 MChroo Clip9 $55 74 Doolittlns GE 11 $48r 97 M95 Monooospo Sport $26 60 W 80 Ho1t Opt ElIdog $43 60 Ry 107 Aeronoo C2 Opt $25 60E 61 00500 038 Gb $32 77 122 Dooglos 038Gb $49 73 N M air Bomb $49 94 P090 CotI 800, $45 65 M Mo oodo 626 $49 71 Mortmo $10 Eoorb 029 8 09 Monqro Bk $42 78 Tooters WW Ran $35 10809 Mooqo Eonb $55 f $3 Cotr Gofrk P1 1C2 542 90 Steo PT lKoydet $36 r Goohk FttC2 $54r 99 N 06 DHoo Conrot Ros 526 71 $ * 62 HnonMMolljgor03$95 0 94 HosoM MolligonS4$06 H 63 Bo,rg P20A Pt826108 84 Boeing P26A Pt$48 60 Doog 00 M 2 Mo024 69Wooo C6 Cohin$3668 8 00 Bol dog Pt520 64 $eeoh C17B Slog$26$96 oonnRoooML A05444 96 5,h C17B Slog $49 1070 rn Boo PEP $94 5$ Look 11 Elootto $30 737 ovol 0000 $24 82 Look 1 EIorro 840 107 Mo 1MB Eon $44 62 SImon 7 W SR7 51691 Lirdbe go NO 211$39 81 Stioson T W 597 $24ISO P0 cIt PTI9T$29 l22StiooooT WSR7$3890W $9 Brintal Pt F2B $2075W 78 Bristol Pt P26 $32100 118 Bristol Ftr P2E $4557 Ford Trirot 4AT$20 74 TL Pesoo Spen $45 76 Ford Tonrtr 4AT84$ 63 Skyrooknt XPSP1 $20114 Pod Triort4AT$59* $6 Cot Wotirk P40 12484 BrIJoyne OPJ2$56 78 Look Light8 P38 12893 bering C2Arnpfr$69 26 Rep SeoB. Anr $5458 GrornJ2P Doob$39 74 RepSeoB Aroph $3978 GronrJ2P Dook$$6 . 106 Pipet J3 Cob $29- 590Bo 98 Look Hodoon 8ob $38117Bo 63 Gron P6P Helloot $2668 B 90 09 02 Tian Moth 539i $4 C Sold Oho SeolersPot oob1nat toohongo Goer 1200 GrIt, 6 73 Potts Intl SOt Up Add 10% oil otdets shipping & 0 eta is. SSACon&MenElsesnherito 15%125%ifbyoirl oriol notolog $200 inolodno Pho Listl Pioe jot onation alone $100 air foreign odd $100 CLEVELAND MODEL & SUPPLY Co 00W*ettpAOKOCsOOIOtiOts5 nest SC OtiS.- ONCE Ct 19307B DETROIT AVE CLEVELAND 01410 4402 Pflo,Sr 1030 torOSOor,0000 3600tL4 PREPARAFlON FORIKEINSCUSSION NOT FcOTBqLL PCEITHL CLUB 15 GOING TO DISCUI5S MUFFLER PULE5 AT . TON IGHT5 MEETING will like building flying version BD-4 Homebuiltl Balsa ply & foam construction 64 span 640 sq area 40- 60 two four cyci 0 MICROMARKS EXCLUSIVE 31 FLEX SHAFT TURNS ANY DREMEL MOTOTOOL INTO FLEXIBLE SHAFT MACHINE INSTANTLY LIGHTWEIGHT SUPER FLEXIBLE COMFORTABLE PEN-SIZE HANOPIECE lets work tight spots ACCEPTS ALL DREMEL ACCESSORIES AND DRILL BITS #800135thru 1/n ______ INCLUDES 4 PRECISION COLLETS AND ANGLE WRENCH Has precision bronze bearings Runs speeds up 20000 RPM #6 dial setting Dremel variable speed models 350 370 & 380 HOW TO ORDER Simply send name address & order MICROMARK Box 5112-4724 E Main St. Clinton NJ 08809 Enclose check money order $1495 Flex Shaft #14260 plus $200 insured delivery USA Moto-Tool Holder #14261 $395 postpaid purchased Flex Shaft COO add $200 per order VISA MASTER-CARD AMEX enclose account number exp date signature CALL TOLL FREE 800-225-1066 NJ 201 -464-6764 48-page tool catalog $100 FREE order pitch axis other hand para mount importance inasmuch maneuvers accomplished through vari ous rates directions pitch change will therefore consider pitch detail So talking same lan guage lets define some terms will recur throughout series First MAC Mean Aerodynamic Chord robot chord 13 tip chord 9 MAC will station wing span chord length 11 MAC technically slightly dif ferent average chord can purposes assume equal colocated MAC important since parameters discuss will refer enced position MAC Also remember tail merely smaller lifting surface therefore exhibits same aerodynamic characteristics wing including MAC CG Center Gravity important recognize CG point about outside force OUR OWN LOW COST MOTO-TOOL HOLDER ONLY $39Sppd purchased FLEX SHAFT Belt clamp werkhench wall USE WITh OUR FLEX SHAFT will act ie thrust drag lift etc Since true force momentsie tail moments pitching moments etcwill defined distance CG last differs historical Stunt practice measuring tail moments hingeline hingeline useless exercise unless comparing otherwise iden tical wing tail planforms Fore aft CG will spoken terms its location MAC CG located 15 inches leading edge 10-inch MAC 15e MAC recognized vertical spanwise location CG probably wont located defined must recognize divergences minor significant affecting pitch C/L Center Lift point MAC wings lift concen trated symmetrical airfoils C/L located 25 e MAC moves some what aft airfoil cambered deflected flaps Lift generated wing tail act respective C/Ls develop moment about CG system works just like parkyard teeter-totter force lift applied given distance fulcrum CG turning movement pitching results Aspect Ratio AR measure relationship wings span its area average chord simple tapered wings shape wings planform top view much cosmetic interest As aspect ratios get larger longer spans given area wing becomes efficient terms lift produced compared drag developed can both good bad will learn C1 Coefficient Lift nondimensional number no real value such inches pounds sex appeal etc reflects relative amount lift airfoil section generates under given set conditions Some general state ments concerning C1 given airfoil will increase increase air speed increase angle attack up point stall airflow sepa rates wings surface lift rapidly drops zero. rare occurrence competitive Stunt ship angle attack increases C1 will increase faster rate high aspect-ratios low Maximum C1 will roughly same both high low aspect ratio however low aspect ratios require higher angles attack same C1 generate greater drag per unit lift Last ly high aspect ratios stall lesser angles attack low Whew think sets stage Next month well dive right design phase see what sort options have developing Stunter thatll per form expectations Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 CL Scale/Boss Continued page 68 color chart listing military scale col ors made Hobbypoxy paints write Hobbypoxy Products Division Pettit Paint Company Inc 36 Pine St PO Continued page 164 WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE IROWNTEL CO A-n PEANUT$3595STANDARD TELCO$2495 CAMPUS BEE$3495TURBO 3000$3295 CAMPUS TWiN$5955TURBO 000093696 SODA CHARGER -$1295 DAVIS- COX 02CONVERSION TO CO-2$2995 NEW CATALOL No25 $150 S.LD*Imjm*me PHONE 619442-4936 UUR6W67WUUW 1019 469-6615 W BOX 2498-MA DIVISION OF BAR/RICH SALES CO 62 FAIRWAY HANNIBAL MO 63401 13141 221-8803 aster FACTURERS OF SPORT PATTERNSTINGER II PEPPERMINT PATTIE 60SPARTAN PEPPERMINT PATTIE 40SPORT/SCALE PEPPERMINT PATTIE 15HIPERBIPE 162 ModelAviation ANOTHER GREAT VALUE
Edition: Model Aviation - 1985/05
Page Numbers: 67, 160, 161, 162
Control Line Aerobatics Ted Fancher AS unfaithful husband said spouse Its best hear Fancher lied reasons arent germane two col umns handles stated pull both lines equal until full control deflection achieved simply isnt true face red soon saw print What should have said total tension both lines will always equal centrifugal force model As control inputs given line being pulled will assume larger share total larger share will equal alr loads flaps elevators transmitted leadouts through alrborne system sufficient mechanical advantage isnt built system entire load will taken individual line point airloads controls equal centrifugal force whether controls full deflection Fortunately foot-in-mouth fatal concepts discussed effects conclusions respect line displacement control feel still valid Only numbers. made whole cloth outset affected conceptual mis statement relates experimental han dle pivoted wrist hinge point would fact some control feel result overcoming air loads Please accept embarrassed apologies Control Line Stunt competition its very nature demanding leisure-time activities requires thorough understanding integration literally thousands bits pieces aerodynamic wisdom engine crafts manship skills neuromuscular coordina tion extremely high degree hours practice honing blending skills level competitiveness desired individual Because huge demand dedica tion part individual Stunt flying never hasand never willappealed masses just too simpler remunerative manufacturer amusements available TV addiction computer hacking Ill make no comment relative merits other activities except state easier avocation master greater participation both prac titioners suppliers Recognizing applaud dedication Stunt think takes special people unfortunate result small level participation equally small amount available user-friendly soft ware Unless have catalogued col lection last 40 years modeling magazinesor better yet live next door Werwage Giesekeaccess informed help designing building flying Stunt airplanes rare commodity Most us learn through repeated trial error. up month marks beginning very ambitious undertaking several years have piecemeal fashion tried share some design trim skills Ive learned course almost 30 years flying Stunt Some gifted builders fliers have over years appended construction articles good basic trim information however best knowledge no has yet undertaken comprehensive discussion Stunt model design development trim design phase through competition-ready what hope several succeeding columns have no idea long will go bear feel will learn Especially since verbalizing perceptions clarifies concepts own mind ition catalyzing response some less-supportive readers Believe Ive learned plenty format complex discussion such difficult develop What MPORTANT STUNT STUFF IILLUSTRATED CG APPX 16- 18%MAC C/LWINGSS% MAO NPOINTSEE TEXT LOCATION VARIES C/LTAILZS% MAO FLAP 15-20%V OFOHORODMACTAIL MACWING ING&ITCHIN1MCMENT CG TO C/LWING TAIL MOMENT COG TO O/LTAIL TAIL AREA 20-25%WING AREA May1985 67 Ive decided following four chronological phases trim put evaluation Design Phase wherein attempt assemble aero ContinuedL 160 Ted beginning series articles hopes shed some light very mysterious subect trimming Stunter desirabie fiying quaiities right youve got start Square Study drawing read column leading trailing edges does include area chines As turned out Paul did fly GEMChineEquipped Modelat WC plans develop idea Reports full Goulburn FE Sympos ium Report 29-page document including new wind-tunnel tests Stuttgart Martin Simons Power Model Trim Stan Hines Lost Wax Engine Casting Dave Sugden available New South Wales FF Society have left FE Champs Planbook 162 pages competitors biographical technical philosophical details together threeview plans also excellent purchase $1000 plus postage NSW FF So ciety Committe 50 Brown St St Peters NSW 2044 Australia responding advertisers mention read about Model Aviation CL Aerobatics/Fancher Continued page 67 dynamic components vehicle hope will fly manner desired B Preflight Phasewhat Large James Greenaway termed bench-trimming love letter published Stunt News wherein assembled airplane configured design parameters ie balance etc C Flying Phase wherein empirically evaluate suc cess earlier two phases make appropriate adjustments necessary D Post-Flight Phase wherein evalu ate subjective objective evidence planes performance Throughout four trim phases attempt optimize six major trim objec tives Stabilitydoes go its pointed constant attention does exit corners hard flat II Response ratedoes turn readily controllably III Line Tensionwhat causes good/bad line tension what about IV Speed Control too fast too slow adjust V Trackingdoes fly consecutive maneuvers concentrically does wander fix VI Turn equalitydoes turn equally both inside outside four phases trim six trim objectives plotted accompany ing table Beside objective variety design parameters inflight factors have effect partic ular objective listed approxi mately descending order influence phase trim parameter con sidered marked X exam ple Stability objective leadout location element Phases B C whereas sealing flap hinge line strictly flying trim consideration C Note addition table brok en down happy airplane side happy pilot side very important realize stated earlier columns handles handle interface between airplane pilot means whereby make properlytrimmed aircraft compatible differ ent pilots often difficult make distinction should kept constantly mind handle should nt adjusted camouflage what aircraft deficiency except last resort discussion will concentrate happy-airplane side comments happy pilot absolutely necessary Next month will start Phase Design Trim address parameters six Trim Objectives Subsequent columns will same succeeding phase few final comments order what assumptions have made plus few definitions terms First no attempt will made quan tify parameter will discussing concepts principles general specific terms ie lift-to-drag ratio improves higher aspect ratios L/D seven-to-one AR 137267% five-to-one AR etc will however provide some personal rules thumb hard numbers time S Send $100 Cash Check Stamps 32 Page Tabloid size illustrated DISCOUNT Catalog Sent 1st Class Mail COMET COX FLYLIN FOX GOLD3ERG GUILLOWS JETCO K&3 PACTRA PECK POLYMER PERFECT SIG- STERLING SULLIVAN TOP FLITE & OTHERS 1111 YALLET RUDDY CIIIfl 137 1 liii St Landau Fm 11146 leO ModelAviation ACCURATE ABLE TOREAD ACC U TAC H NOW IN TWO MODELS 3 FUNCTION4 FUNCTION ACCUSTACH 1ACCU-TACH 2 Digital8995 LCD tachometerSame useful capabilities has dual scale lOX-bOXas ACCU-TACH 1 stable RPM readoutincludes DC ammeter Full scale voltmeter canused check servo curbe used check/cyclerent Will find worn bindmost TXIRX battery com-ing stalled servo condi bos Reads loadtions w/SCA1 up 20 voltsAdd function ATi ACCESSORIESor SCAl -Servo Current Adaptor OSAl- Quarter Scale Adaptor ATi & AT2-500ma . 95 Airtronics Futaba Kraft 995 Send check MO NorCal AVIONICS IncINC P0 Box 70956 Sunnyvale CA 94086 Cahf add 6% tax Add $2 S&H See dealer first Old time Quality stiit I-LYLINfr Kit VOl9p. 5E9ISMM MPM 3-CbMORIl 0/C yd. PLACE AT TAR ENTER NATEERIALE$2195 FREE FLIANIT SCALE COSREETETIEN RICA AKit #103 MOORE WILE FROM TENS KIT TAlE MATAL VOWER nd 5O Phone 703 273-9593Flyline Models Catalog FLYLINE MODELS INC PO S. 2t3 Ffrf. Vh 121 USA EnI Parts Ofily have parts vntoty prompt dRIllveryi Over 23i itsmi Send *2W Out Current List time Recognize opin ions may shared promise wont get trou ble use will also assume systems ie engine tank weights leadouts etc adjustable Some just harder adjust others will assumed control sys tem has sufficient mechanical advantage overcome reasonably-encountered air loads controls Again con trol system requires extensive coverage its own merits will covered detail series However heres rule thumb Ted Modern full-size Stunters 35 60-powered should use minimum three-inch bellcrank 35 four inches strongly recommended Control horns should have flap-toelevator pushrod located inch flap horn variable 6 inch elevator bellcrank-to flap rod should least 75 pivot horn its location bellcrank should selected based preference control sensitivity Use 6 slow response much perhaps 1 / very fast response personally use 9 Finally since CL Stunters flown tethered wing tip can afford fairly casual treatment understanding roll yaw axes importance will largely confined discussion line tension n 6DGA DESIGNS Full Body Pilot KIt Lightest Pilot available oLIfelike vinyl la tex rubber parts Easy assemble finish Build either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable Some simple sewing required WeightPrice 1/6 Scale2oz*$ 795 1/4 Scale4oz$ 995 1/3Scale6oz*$1695 Weightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6Scale 75oz 1/4Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 Lightest bust pilot available Lifelike vinyl latex rubber parts GEasy assemble finish Build either barnstormer sportsman pilot Kit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send $100 current catalog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MD Allow 3 weeks check clearSorry-No COD 5 IJU ml itei U 3405 Cleveland Ave SW Canton ON 44707 Send$lforCafalag 4846810 RousH MFG May1985 161 CLEVELAND GIANTSI NEW FOR GIANTSALE BUFFS~ Worlds Largest Gas Plans Assortmp RNATIONALLY FAMOUS CO QUALITY MASTER MODELS PLANS 54rSDDnroisolle 21 $4 78Consol Cot P5Y5A $42 72 Cot 0201/4 LbS $46 04 Con Cot PEYSA $56 62 Hornord Roco lb $45 96 WrrgM-NooyRooe $48 77 Eonng 870 Port $35 52 W-Worsl2l 64 L $36 103 silo Fott $55 77W-W0,121 94 L $48 68 Doog O46A Gb. $32 84 pokbr D7 Pt$39. 108 Skor S30 Aropit $414 60 Hosnord Pet Rose $32 60 B 70 Soylo 00080 $32 90 5po 60 Sopetotorin S6B $24 90$ 89 Sop~o~no 066 $32 80 Mortn 74 TAM1 $29 62 Cort Ooatk P69 $42 70 HP0 0400 Eoorb $42 94 CotHook P6E Ftr $54 104 HPg 0400 Boor $36 62 LookIred V80$24 65 MChroo Clip9 $55 74 Doolittlns GE 11 $48r 97 M95 Monooospo Sport $26 60 W 80 Ho1t Opt ElIdog $43 60 Ry 107 Aeronoo C2 Opt $25 60E 61 00500 038 Gb $32 77 122 Dooglos 038Gb $49 73 N M air Bomb $49 94 P090 CotI 800, $45 65 M Mo oodo 626 $49 71 Mortmo $10 Eoorb 029 8 09 Monqro Bk $42 78 Tooters WW Ran $35 10809 Mooqo Eonb $55 f $3 Cotr Gofrk P1 1C2 542 90 Steo PT lKoydet $36 r Goohk FttC2 $54r 99 N 06 DHoo Conrot Ros 526 71 $ * 62 HnonMMolljgor03$95 0 94 HosoM MolligonS4$06 H 63 Bo,rg P20A Pt826108 84 Boeing P26A Pt$48 60 Doog 00 M 2 Mo024 69Wooo C6 Cohin$3668 8 00 Bol dog Pt520 64 $eeoh C17B Slog$26$96 oonnRoooML A05444 96 5,h C17B Slog $49 1070 rn Boo PEP $94 5$ Look 11 Elootto $30 737 ovol 0000 $24 82 Look 1 EIorro 840 107 Mo 1MB Eon $44 62 SImon 7 W SR7 51691 Lirdbe go NO 211$39 81 Stioson T W 597 $24ISO P0 cIt PTI9T$29 l22StiooooT WSR7$3890W $9 Brintal Pt F2B $2075W 78 Bristol Pt P26 $32100 118 Bristol Ftr P2E $4557 Ford Trirot 4AT$20 74 TL Pesoo Spen $45 76 Ford Tonrtr 4AT84$ 63 Skyrooknt XPSP1 $20114 Pod Triort4AT$59* $6 Cot Wotirk P40 12484 BrIJoyne OPJ2$56 78 Look Light8 P38 12893 bering C2Arnpfr$69 26 Rep SeoB. 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TON IGHT5 MEETING will like building flying version BD-4 Homebuiltl Balsa ply & foam construction 64 span 640 sq area 40- 60 two four cyci 0 MICROMARKS EXCLUSIVE 31 FLEX SHAFT TURNS ANY DREMEL MOTOTOOL INTO FLEXIBLE SHAFT MACHINE INSTANTLY LIGHTWEIGHT SUPER FLEXIBLE COMFORTABLE PEN-SIZE HANOPIECE lets work tight spots ACCEPTS ALL DREMEL ACCESSORIES AND DRILL BITS #800135thru 1/n ______ INCLUDES 4 PRECISION COLLETS AND ANGLE WRENCH Has precision bronze bearings Runs speeds up 20000 RPM #6 dial setting Dremel variable speed models 350 370 & 380 HOW TO ORDER Simply send name address & order MICROMARK Box 5112-4724 E Main St. Clinton NJ 08809 Enclose check money order $1495 Flex Shaft #14260 plus $200 insured delivery USA Moto-Tool Holder #14261 $395 postpaid purchased Flex Shaft COO add $200 per order VISA MASTER-CARD AMEX enclose account number exp date signature CALL TOLL FREE 800-225-1066 NJ 201 -464-6764 48-page tool catalog $100 FREE order pitch axis other hand para mount importance inasmuch maneuvers accomplished through vari ous rates directions pitch change will therefore consider pitch detail So talking same lan guage lets define some terms will recur throughout series First MAC Mean Aerodynamic Chord robot chord 13 tip chord 9 MAC will station wing span chord length 11 MAC technically slightly dif ferent average chord can purposes assume equal colocated MAC important since parameters discuss will refer enced position MAC Also remember tail merely smaller lifting surface therefore exhibits same aerodynamic characteristics wing including MAC CG Center Gravity important recognize CG point about outside force OUR OWN LOW COST MOTO-TOOL HOLDER ONLY $39Sppd purchased FLEX SHAFT Belt clamp werkhench wall USE WITh OUR FLEX SHAFT will act ie thrust drag lift etc Since true force momentsie tail moments pitching moments etcwill defined distance CG last differs historical Stunt practice measuring tail moments hingeline hingeline useless exercise unless comparing otherwise iden tical wing tail planforms Fore aft CG will spoken terms its location MAC CG located 15 inches leading edge 10-inch MAC 15e MAC recognized vertical spanwise location CG probably wont located defined must recognize divergences minor significant affecting pitch C/L Center Lift point MAC wings lift concen trated symmetrical airfoils C/L located 25 e MAC moves some what aft airfoil cambered deflected flaps Lift generated wing tail act respective C/Ls develop moment about CG system works just like parkyard teeter-totter force lift applied given distance fulcrum CG turning movement pitching results Aspect Ratio AR measure relationship wings span its area average chord simple tapered wings shape wings planform top view much cosmetic interest As aspect ratios get larger longer spans given area wing becomes efficient terms lift produced compared drag developed can both good bad will learn C1 Coefficient Lift nondimensional number no real value such inches pounds sex appeal etc reflects relative amount lift airfoil section generates under given set conditions Some general state ments concerning C1 given airfoil will increase increase air speed increase angle attack up point stall airflow sepa rates wings surface lift rapidly drops zero. rare occurrence competitive Stunt ship angle attack increases C1 will increase faster rate high aspect-ratios low Maximum C1 will roughly same both high low aspect ratio however low aspect ratios require higher angles attack same C1 generate greater drag per unit lift Last ly high aspect ratios stall lesser angles attack low Whew think sets stage Next month well dive right design phase see what sort options have developing Stunter thatll per form expectations Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 CL Scale/Boss Continued page 68 color chart listing military scale col ors made Hobbypoxy paints write Hobbypoxy Products Division Pettit Paint Company Inc 36 Pine St PO Continued page 164 WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE IROWNTEL CO A-n PEANUT$3595STANDARD TELCO$2495 CAMPUS BEE$3495TURBO 3000$3295 CAMPUS TWiN$5955TURBO 000093696 SODA CHARGER -$1295 DAVIS- COX 02CONVERSION TO CO-2$2995 NEW CATALOL No25 $150 S.LD*Imjm*me PHONE 619442-4936 UUR6W67WUUW 1019 469-6615 W BOX 2498-MA DIVISION OF BAR/RICH SALES CO 62 FAIRWAY HANNIBAL MO 63401 13141 221-8803 aster FACTURERS OF SPORT PATTERNSTINGER II PEPPERMINT PATTIE 60SPARTAN PEPPERMINT PATTIE 40SPORT/SCALE PEPPERMINT PATTIE 15HIPERBIPE 162 ModelAviation ANOTHER GREAT VALUE