Control Line Aerobatics Ted Fancher LAST MONTH discussing Response Rate up point left off everything spoken namely pitching moment opposi tion desired pitch change Lets dis cuss make turn t way prime motivators elevators make pun correctly lift produced tail stab elevator its distance Center Gravi ty CG efficient tail pro ducing lift further lift pro duced CG leverage will apply about CG first over comes opposing pitching moment wings lift rotates aircraft about CG until pilot neutralizes controls Once should consider tail volume area times average chord area stab elevator should nor mally between 20% 25% wing area Both larger smaller areas have used no discernible advantage Area should juggled tail moment arrive desired tail effectiveness Longer arms generally effective increasing response tend make ship tail-heavy rapidly area does Higher aspect ratios tail sur faces will produce lift given angles elevator deflection will therefore responsive Again AR made too high smooth control inputs will difficult maintain instance round maneuvers will tend show little flat spots minor control cor rections create comparatively major pitch changes Notice dichotomy between implied preference fairly high aspect ratios response rate low aspect ratios stability Compromise compromise opt lower aspect ratios accept need deflection area obtain lift necessary given rate pitch change Speaking Control Deflection lets discuss conjunction Flap Elevator Ratio has stated some authorities 20 30 somesuch degrees control travel necessary perform hard stunt corner state ment true particular set conditions given airplane general rule designs amount control deflection given rate turn variable based airspeed aspect ratios especially CG rela tionship C/L center lift amount pitching moment will take control deflection given turn rate early flight full fuel tank Continued page 155 70Model Aviation Sgt Al Reed Orlando FL ST 46powered Imitation MA plan No280 placed third Advanced PAMPA category last King Orange Internats White wired blue trim West Germanys Natlenal Champion Dr Geza Egervary flew Marionette 18th place finish last years CL World Champs Chicopee MA Pheto Claus Makis Plotr Zawada Poland lies STpowered original calls Lucky 18 Piotr regu lar Polish Stunt team serious Stunt competitor Photo P Zawada Du-Bro Rocket City labels Paint color formula correction Pettit Paint Co makers Hobbypoxy paints rias just issued correction previously-published Royal Air Force ky Type S paint formula seems vhen formula originally published s clerical error caused omission fellow component company mixed paint correctly color chips issued orrect printed formula Arong mix paint according originally-published formula youll et light blue instead light green sh-blue Sky Type S supposed correct formula Sky Type S11 parts HlO White three parts H70 Gray ne part H26 Light Blue part 1147 Bright Yellow Send ideas photos etc CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 70 end flight CG has moved aft due fuel tank having consumed Inasmuch flaps elevator move unit ie fixed relationship other inasmuch lift mindlessly increased flaps result control deflection no con sideration amount lift actually necessary support G loads corner becomes obvious probably generating lift re quired given time case would frequently stall Stunters hard corners additional lift increases pitching moment means reduced rate pitch first began discussion response rate last month spoke pitch rate predictable controllable addition being rapid becomes important keep liftrequired/lift-produced equation balance Lift excess required G forces produced will accelerate ALL PURPOSE FOAM CU1TER Hands Off Cut II $10250 plus *800 ship ft handI Assembled Model HANDS OFF CUT II unique device cutting high quality foam wing cores hands off also cuts both sides same time Most modelers will amazed high quality smooth surface will achieve using device plus added ad vantage having wait until friends can come around help However just foam wing cutter HANDS OFF also capable cutting precision foam components such fuselage sections cowls tail surfaces HANDS OFF available two ways 1 completely assembled easy store fold up box includes handy 40 inch bow blocking up foam 2 hardware package assemble own board HANDS OFF CUT II requires 24 volt variable output power supply Hands Off Cut II Hardware PkgJ $8750 plus $3 ship ft hand 24 Volt Variable Output Power Supply$5250 plus $3 ship ft hand AY PRODUCTS INC aircraft direction change once pitching moment overcome surface sounds like good deal what actually occurs lift acts right angles wing chordline airplane leaps direction lift. rotating new body angle what seeking result airplane jumps hard corners making shapes difficult control rates final position difficult predict discussing lift lets talk about wing thickness has often stated should use thick 18% 20%-plus wings increase lift potential After 5008 Sandbeach Road Wichita Falls TX 76310 1 MOS9PCOPd Tel 1817692-4475 2 reading foregoing probably real ize no longer share opinion reasonable thickness desirable 12% ballpark figure prevent early flow separation stall very thick sections seldom needed sake lift Structural considerations probably important factor higher aspect ratio thicker wing should prevent flexing apt very controversial since dont feel extra thickness does partic ular harm thickness airfoil shape causes minimum drag increase much less significant lift area make wing thick like Continued page 158 Ota lime uairy sun IL ru Kit 41 WinaMpon lealne WpNo 3-Channel 5/C MyMNeNNO MAGNIFICENT RENDITION OF ALL-TINE FAVORITE AIRCRAFT RON AOREATI WON 95 SECOND PLACE AT THE 1906 NATIONALS Kit #103 $21 FREE FASAT SCALE COMPETITION WITH MODRL RUILT FROM THIS RIO THIS MODEL MAR ALSO SE FLOWN WITH ELECTRIC ROWERSend SOt Phone 703 2739593 Flyline Models Catalog FLYLINE MODELS INC PO Sax 2136 FaIrfax VirgInia 22031 USA MRC Grssshoppsr Rag6596 OsrPnlcs5799 June 1985 155 2IIciA FIaEROLASS & FOAM CONSTRUCTION PAl & AMA PATFERN 60-61 ENGINE #64 SPAN 704 sq AREA WEIGHT7 TO 8 LBS DEPENDING ON EQUIP BASIC KIT 95 DELUXE KIT 95 Call 1000 SM 900 PM Mss-Sat & MASThR CARD L S L MODEL DEALER & 01STMPG WAPRODUCTS ONOOJONNOES WAITED73W2 MNPIMWWNO COMEt 15131 3M5-eSIGORNI,NI ShIN M5547 ———---------- — 72 Volt Raltery. . 2999 Qlckchwgr2899 Prices Good Tb ough May15 h ALL MAJOR LINES CARRIED IN DEPTH Send stamped addressed enAMIOPe price list ac capt MC Visa Amer EXPRWNN Diners club money ders cashier checks PWEMOAMI chWcks held 21 days ShippingAdd $350 COD cash $195 extra Over size packages cost TX add 5% tas Prices subject change notice Stars Moans MsaSuI 106 Isa 12-5 506 4JFUB DESIGNS Body Pilot Kit eLightest Pilot aval lab 10 oLiteilke vinyl la tex rubber parts Easy assombie finish eBuild either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable oSome simple sewing required WeightPrice 1/6 Scale2oz*$ 795 1/4 Scale4oz$ 995 1/3Scale6oz*$1695 AWeightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit iSca I1SZ Weight Price 595 795 $1495 eLightest bust pilot available eLifelike vinyl latex rubber parts Easy assemble finish eBuild either barnstormer sportsman pilot sKit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send Si 00 current catalog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MO Allow 3 weeks check clear Sorry-No CODs Em11ju ml i [1 ox 279CU Park Falls WI 54552 IProudly Presents CL Aerobatics/Fancher Continued page 155 phenomenon also argues mod eration pursuit high aspect ratios virtues Because higher aspect ratios increase lift coefficient greater rate angle attack increases can seen excessively high ARs will induce same leaping-type accel eration sharp corners Only educat ed guess bet thats part reason Denny Adamisin tries fly very-high-AR stunters very slow speeds mitigate very rapid buildup lift would result combi nation high speed high lift coeffi cient given angle attack mans opinion Ever eaward Lets see what can design stages optimize line tension whole lot would seem perusal Trim Table last months column Thats basically truth can decide whether much following use tip weight wing asym metry engine offset leadout position rudder configuration part items act concert another insure can take advantage real source line tension engines horsepower actually produce themselves worth stating little can produce line tension great deal can lose design standpoint should consider wing asymmetry ie inboard wing larger equalize lift since flies slower outboard have National World Championship Stunters wing asym metry therefore conclude significantly important Thatll really ring some bells Its opinion again Since equal-panel wings require tip weight balance lift requirements both wings would opt certain amount asymmetry reduce need significant amounts weight long way CG wing asymmetry seems matter taste outboard flap should probably always slightly larger inboard Heres wing tip weight used balance both lift differential two wings overcome weight lines control system located inor attached tothe inboard wing amount weight proper level flight increased effectiveness G loads hard corner will therefore cause ship roll direction ularly known hinging making outboard flap little larg er corner being flown out board wing will have slightly greater crease lift thus offsetting increased G load tip weight Whew Engine offset helpful particularly instance lost line tension tends FREE BOAT KITS 48 pg Catalog SAVE ORY BUILT COST 20 power & sail models 11 30 Fiberglass hulls/decks lactoiy sembled install interior- no experience required Same lactonj-built FREE 48 P catalog LUGER BOAT KITS Dept MA-65 3800 W H ri Burnsville 7innesota 55337 612-890-3000 return ship end lines belongs same can said small amount rudder offset An adjustable rudder probably best alternative although have personally gone fixed surface airfoiled inside per Nobler have hap pier lack yet another adjustment make final design parameter influencing line tension leadout location relative CG location same established stability objective roughly 30 aft fore-and-aft location CG fuselage centerline An additional consideration very important building Stunter unusual planform such Al Rabes semi-scale ships dihedral con sider leadouts exit point relative vertical location CG should line arent say leadouts exit above CG flight CG will align itself exit point resulting aircraft banking toward resulting bank single effective way throwing away line ten sion short running out gas Well have lot mere say about line tension discussion flying trim now lets look Trim Objective Speed Control 158 Model Aviation SUPER SALE 14w . 441. tq. w q4 w41441f .Id ff.11 lb. Ob.h 14 hg .h3 14. 4 4 4w. Uty h.sddt .d . 14 4 dIb 4144 di , i 4w9 ha ii q.h. .l 4fr 114 d4S39 AS M.y 44, 1444. d&4. S144y BETA SU .d.4q C,444 h.14 4s4yd4* N COD VideoTech PO Box 1917-30086 Stone Mt GA 30086 SILICONE 10 foot coilsTUBING lD.062 092 125U S POST S/coil235 265 325 54/COIL LARRY DODGE AERO INC 10210 MANNINGSTILLWATER MN 55082 RIO First Series Great Flying Canards RIC Modeler Al Featuring fast service qualified people latest equipment including SPECTRUM ANAL YZER AM FM SIGNAL GENERATOR Call Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessories discounted prices 904 478-6745 RADIO SOUTH- AUTHORIZED SERVICE CENTER FOR Kroft Pro Line tabe JR 43 West Nine Mile Rd Pensacola FL 32514 * A Futaba Distributor er Inquiries Welcome * Speed control again influenced eripherally design considerations rimary attention will given flying hase Some things can however said speed airplane governed wo things thrust drag Heres mother irreverent statement Fan Reasonable amounts form drag shape object moving hrough air mass parasitic drag drag skin friction lines wheel etc s good thing Stunt ship hying engines operating signifi antly below horsepower potential ie much lower rpm figures opti mum part keep airspeed manage able sleeker make ship Faster goes given amount thrust rgo slower must run engine trgo lesser amount horsepower getting engine ad nauseum acceptingbut seek ingsources drag develop means whereby can operate engine zloser its peak horsepower los ng control speed So go ahead put bombs antennas big wheels etc.. however make sure youve really got horsepower available first Theres other form drag about cant cavalier thats induced drag drag induced pro duction lift again higher aspect ratios will reduce amount induced drag given amount lift Just sure consider caveats mentioned earlier about excessive aspect ratios TrackIng has several design aspects can discussed together have mentioned previously An explanation tracking may helpful maneuver descriptions require consecutive maneuvers flown concentrically. spot hin two feet track first maneuver Stunter locks-on rate turn round maneuver tends follow same radius smoothly little control input said track well requires con stant control trimming maintain ra dius input causes noticeable flat spots rounds poor tracking Lets consider Tail Volume again aspect ratio tail too high change lift minor control inputs will larger resulting noticeable pitch changes flat spots Thats fairly straightforward Less simple effects pitching moment CO C/L Flap Effects will consider together gets little controversial consider source lift required loop con stant Going up lift must oppose gravity pitching moment will large requir ing larger control inputs both overcome establish desired radius turn Over top loop coming down inverted required lift lessened inasmuch gravity lift now work gether reduction lift reduces pitching moment requires control backed off retain radius loop As can see greater variation pitching moment wing great er variation control input required pilot maintain constant radi us Therefore contrary popular opin ion adding nose weight proper solution tracking problems since will increase arm between CG C/L another sound argument keeping lift produced line lift required Continued page 160 Custom Built LD Models 2036 N Thetue Ave sne CA 93704 Order Phone 209 233-1050ask Bill LOVE fly HATE build Contact ve solution problem Kits Custom Built Order Sanded Ready Cover AndrewsGoldbergGreat PlanesEtc - IF1yWhatI3ui1d June 1985 159 Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% Lighter Sandable Carveable Excellent Gap Filling Non-Sagging Superior Strength $fl95 Sands Carves like Basswood l 16 81 oz Equal over 8 wt oz regular epoxys See dealer first write call PO Box 19784 St Paul MN 55119 715 425-1397 MODEL MAGIC PRODUCTS 0 Model Magic Filler 0 0 S S Comparison Chart Model Magic Product X Adhesion BalsaEacellent Foam Fiberglasa Strength Flesing Spreading FuelResistance SandingAs med balsa HardnessAs hard balsa FinishingAny finish/covering Shelf Lifetill used up TintAcceptanceExcellent water ResistExcellent 0 very Poor Soft balsa Soft balsa 5-7 inn very Poor Test methods data available request care enough fill very best insist Model Magic Filler Circtie Manic Filler r Super sport flier turnaround pattern esisa Construction 70 span 927 sq area $1 j 759859 lbs 75-12cu Dealer Inquiry Invited 3405 Cleveland Ave SW Canton OH 44707 Send $1 Catalog 1216 4846810 mm~~ROUSH MFG 31-lllllrlb S HANDLING Up $999 add $199 $891 $2909 add $229 $2901 $9590 add $300 $9591 $7099 add $309 over $7909 add $9 001 CA Addressees add 69 tax Send MO visa/McI#Exp Check lallow up 30 days CK clearancel COD Exact Charges plus $159 Hdl ICash Only 84 Page CATALE*uu*S $209 PP/tnt Class espy will oent free--when requested-with order HOBBY HORN 15173 Moran St [A] PO Box 2212 Westminster Ca 92699 1719 8938311 [Aft Nm 719 8951203] 160 Model Aviation Still own opinion flaps have strong effect tracking Particu larly influential spanwise distribu tion As flaps get shorter tracking suf fers Flaps should long span nar row chord Rule Thumb Fancher Flaps should full-span nearly chord should range 15% 20% wing chord depending air craft weight addition hingeline should straight Since Stunter flies constant left skid straight hingeline assures airflow across airfoil consistent possible entire span final design objective Uniformity Turn pitch prime design factor Decalage Decalage fancy term alignment wing tail blunt should no decalage Stunter centerlines wing tail matter thrust line must parallel Any misalignment of either design construc tion will result plane turns dif ferently inside versus outside Dont Secondarily aware locate large draggy parts airplane Uneven vertical distribution drag relative CG will result unequal turns No rules thumb must eyeball side view make educated guess drag distribution same goes drags opposite number thrust Dont mount engine pylon above tail expect ship turn well inside about winds up design phase Next month well preflight get started flying Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 gles Does mean surrender quite As Ted correctly pointed out ineffective tail surfaces elevator pushrod discon nected will cause violent nose-down response up-elevator down-flap control reversed control vengeance extreme deflected flaps create 75 in-lb nose-down mo ment tail surfaces produce 28 lb download 70 in-lb nose-up moment due elevators too small size too little deflection result will still reversed controls violently same flap deflection stronger tail surfaces produced 32-lb download 80 in-lb nose-up moment result would positive nose-up rotation response up-control application Lets put together have Stunt ship wing-bending load 50 lb 3-az change tail download causes turn Its opinion real work situation high ljfl required oppose high 0-loads tight corner Relatively little effort ex pended change body angle relatively little change body angle required airplane turn sharply Once again maneuvering body angle maximum loads should approximate body angle slow-speed stall case full-flap Stunt ship observe body angle such case slight thus insignificant pitchinsignificant P-factor statement does did read No pitchno P simply signs real effects P recognized addressed less importance effect precession applica tion full-flap Stunt ships summarize did suggest _______________________________.. aircr. can make abrupt pitch change. achieving posi CL Aerobatics/Rabetive geometrical angle attack. . did Continued page 71add sufficient proper accurate modi tion would closer 8 Gsfiers various statements such such airplane configuration .dramatically reduce body angle relative wind. t ships possible Id first admit its usually have small body angles land performance would akin stall little nose-up pitch elevator Stunt ship An air- statements flatly suggest plane would incapable Stunt pattern withit positive negative body an- Continued page 162 tilt $595 081 ozl taluezs t,eng Kepair Timer LaNtus 8 Gus axOEL c/I/todd Elt7LcL 9mm IREaKEr -tell eROOKLYN DOOcER 59 cabin WEST Retail $52 95*aINTRoDucToRY PRICE $3909 t930 Recerd Breaker 96 $6956 t939Zipper59$5356 t939 Kioud King 63 $4236 1991 Brigidier 56 $4976 t991 Super Ouaker 79 $7776 1940 So Long 5tS3936 t936 Buccaneer 09 $5996 1938 clipper MKI 72$ill56 1937 Dallaire tOt $7516 t93t Miss America 89 $7196 t991 Playboy Sr 50 $5116 1991 Playboy Jr 59 $3119 1938 Powerhouse 89 $5356 1990 Sailplane 78 $9976 1938 Trenton Terror 72 $9076 1990 Ranger 96$3t 96 1939 Korda Wake 99 $t916 1939 Mercury 72 6 kits qualify SAM events 1FF & RId feature highest quality machine cut & sanded parts Superior competition alt sheet atrip wood wire & window material Plans orig PP models easily convertible 3ch RIC KITS Sailpianes Electric power cas Hobby Horn SENSOAR Clider 78 9sl $1800 Midway Model GNOME RIC Hand Launch Glider$2900 Jolly Models FLINcER RIC HLG 50 Span $2990 Midway Model FAST EDDIE Aerobatic /09 Elec$t990 Jolly Models ELECTRIcUS Electric Clider 95s$3259 Leisure PLAYBOY SR 67 cear 95 Elect $3900 Astro ASTRO SPORT 37 Direct 99 Elect $2290 Leisure WASP 37 far Direct 95 Electrics $2250 Midway ULTRA MK iv 86 far Geared 09 EP $3999 Midway FLYING QUAKER 89 90-959 strake $6976 9ks/Midway DENNY JR 72 Alum camel $9396 9ks/Midwav BUZZARD BOMBSHELL 72$5196 FULL LINE OF ELECTRIC SYSTEMS 9 Parts Avail
Edition: Model Aviation - 1985/06
Page Numbers: 70, 155, 158, 159, 160
Control Line Aerobatics Ted Fancher LAST MONTH discussing Response Rate up point left off everything spoken namely pitching moment opposi tion desired pitch change Lets dis cuss make turn t way prime motivators elevators make pun correctly lift produced tail stab elevator its distance Center Gravi ty CG efficient tail pro ducing lift further lift pro duced CG leverage will apply about CG first over comes opposing pitching moment wings lift rotates aircraft about CG until pilot neutralizes controls Once should consider tail volume area times average chord area stab elevator should nor mally between 20% 25% wing area Both larger smaller areas have used no discernible advantage Area should juggled tail moment arrive desired tail effectiveness Longer arms generally effective increasing response tend make ship tail-heavy rapidly area does Higher aspect ratios tail sur faces will produce lift given angles elevator deflection will therefore responsive Again AR made too high smooth control inputs will difficult maintain instance round maneuvers will tend show little flat spots minor control cor rections create comparatively major pitch changes Notice dichotomy between implied preference fairly high aspect ratios response rate low aspect ratios stability Compromise compromise opt lower aspect ratios accept need deflection area obtain lift necessary given rate pitch change Speaking Control Deflection lets discuss conjunction Flap Elevator Ratio has stated some authorities 20 30 somesuch degrees control travel necessary perform hard stunt corner state ment true particular set conditions given airplane general rule designs amount control deflection given rate turn variable based airspeed aspect ratios especially CG rela tionship C/L center lift amount pitching moment will take control deflection given turn rate early flight full fuel tank Continued page 155 70Model Aviation Sgt Al Reed Orlando FL ST 46powered Imitation MA plan No280 placed third Advanced PAMPA category last King Orange Internats White wired blue trim West Germanys Natlenal Champion Dr Geza Egervary flew Marionette 18th place finish last years CL World Champs Chicopee MA Pheto Claus Makis Plotr Zawada Poland lies STpowered original calls Lucky 18 Piotr regu lar Polish Stunt team serious Stunt competitor Photo P Zawada Du-Bro Rocket City labels Paint color formula correction Pettit Paint Co makers Hobbypoxy paints rias just issued correction previously-published Royal Air Force ky Type S paint formula seems vhen formula originally published s clerical error caused omission fellow component company mixed paint correctly color chips issued orrect printed formula Arong mix paint according originally-published formula youll et light blue instead light green sh-blue Sky Type S supposed correct formula Sky Type S11 parts HlO White three parts H70 Gray ne part H26 Light Blue part 1147 Bright Yellow Send ideas photos etc CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 70 end flight CG has moved aft due fuel tank having consumed Inasmuch flaps elevator move unit ie fixed relationship other inasmuch lift mindlessly increased flaps result control deflection no con sideration amount lift actually necessary support G loads corner becomes obvious probably generating lift re quired given time case would frequently stall Stunters hard corners additional lift increases pitching moment means reduced rate pitch first began discussion response rate last month spoke pitch rate predictable controllable addition being rapid becomes important keep liftrequired/lift-produced equation balance Lift excess required G forces produced will accelerate ALL PURPOSE FOAM CU1TER Hands Off Cut II $10250 plus *800 ship ft handI Assembled Model HANDS OFF CUT II unique device cutting high quality foam wing cores hands off also cuts both sides same time Most modelers will amazed high quality smooth surface will achieve using device plus added ad vantage having wait until friends can come around help However just foam wing cutter HANDS OFF also capable cutting precision foam components such fuselage sections cowls tail surfaces HANDS OFF available two ways 1 completely assembled easy store fold up box includes handy 40 inch bow blocking up foam 2 hardware package assemble own board HANDS OFF CUT II requires 24 volt variable output power supply Hands Off Cut II Hardware PkgJ $8750 plus $3 ship ft hand 24 Volt Variable Output Power Supply$5250 plus $3 ship ft hand AY PRODUCTS INC aircraft direction change once pitching moment overcome surface sounds like good deal what actually occurs lift acts right angles wing chordline airplane leaps direction lift. rotating new body angle what seeking result airplane jumps hard corners making shapes difficult control rates final position difficult predict discussing lift lets talk about wing thickness has often stated should use thick 18% 20%-plus wings increase lift potential After 5008 Sandbeach Road Wichita Falls TX 76310 1 MOS9PCOPd Tel 1817692-4475 2 reading foregoing probably real ize no longer share opinion reasonable thickness desirable 12% ballpark figure prevent early flow separation stall very thick sections seldom needed sake lift Structural considerations probably important factor higher aspect ratio thicker wing should prevent flexing apt very controversial since dont feel extra thickness does partic ular harm thickness airfoil shape causes minimum drag increase much less significant lift area make wing thick like Continued page 158 Ota lime uairy sun IL ru Kit 41 WinaMpon lealne WpNo 3-Channel 5/C MyMNeNNO MAGNIFICENT RENDITION OF ALL-TINE FAVORITE AIRCRAFT RON AOREATI WON 95 SECOND PLACE AT THE 1906 NATIONALS Kit #103 $21 FREE FASAT SCALE COMPETITION WITH MODRL RUILT FROM THIS RIO THIS MODEL MAR ALSO SE FLOWN WITH ELECTRIC ROWERSend SOt Phone 703 2739593 Flyline Models Catalog FLYLINE MODELS INC PO Sax 2136 FaIrfax VirgInia 22031 USA MRC Grssshoppsr Rag6596 OsrPnlcs5799 June 1985 155 2IIciA FIaEROLASS & FOAM CONSTRUCTION PAl & AMA PATFERN 60-61 ENGINE #64 SPAN 704 sq AREA WEIGHT7 TO 8 LBS DEPENDING ON EQUIP BASIC KIT 95 DELUXE KIT 95 Call 1000 SM 900 PM Mss-Sat & MASThR CARD L S L MODEL DEALER & 01STMPG WAPRODUCTS ONOOJONNOES WAITED73W2 MNPIMWWNO COMEt 15131 3M5-eSIGORNI,NI ShIN M5547 ———---------- — 72 Volt Raltery. . 2999 Qlckchwgr2899 Prices Good Tb ough May15 h ALL MAJOR LINES CARRIED IN DEPTH Send stamped addressed enAMIOPe price list ac capt MC Visa Amer EXPRWNN Diners club money ders cashier checks PWEMOAMI chWcks held 21 days ShippingAdd $350 COD cash $195 extra Over size packages cost TX add 5% tas Prices subject change notice Stars Moans MsaSuI 106 Isa 12-5 506 4JFUB DESIGNS Body Pilot Kit eLightest Pilot aval lab 10 oLiteilke vinyl la tex rubber parts Easy assombie finish eBuild either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable oSome simple sewing required WeightPrice 1/6 Scale2oz*$ 795 1/4 Scale4oz$ 995 1/3Scale6oz*$1695 AWeightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit iSca I1SZ Weight Price 595 795 $1495 eLightest bust pilot available eLifelike vinyl latex rubber parts Easy assemble finish eBuild either barnstormer sportsman pilot sKit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send Si 00 current catalog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MO Allow 3 weeks check clear Sorry-No CODs Em11ju ml i [1 ox 279CU Park Falls WI 54552 IProudly Presents CL Aerobatics/Fancher Continued page 155 phenomenon also argues mod eration pursuit high aspect ratios virtues Because higher aspect ratios increase lift coefficient greater rate angle attack increases can seen excessively high ARs will induce same leaping-type accel eration sharp corners Only educat ed guess bet thats part reason Denny Adamisin tries fly very-high-AR stunters very slow speeds mitigate very rapid buildup lift would result combi nation high speed high lift coeffi cient given angle attack mans opinion Ever eaward Lets see what can design stages optimize line tension whole lot would seem perusal Trim Table last months column Thats basically truth can decide whether much following use tip weight wing asym metry engine offset leadout position rudder configuration part items act concert another insure can take advantage real source line tension engines horsepower actually produce themselves worth stating little can produce line tension great deal can lose design standpoint should consider wing asymmetry ie inboard wing larger equalize lift since flies slower outboard have National World Championship Stunters wing asym metry therefore conclude significantly important Thatll really ring some bells Its opinion again Since equal-panel wings require tip weight balance lift requirements both wings would opt certain amount asymmetry reduce need significant amounts weight long way CG wing asymmetry seems matter taste outboard flap should probably always slightly larger inboard Heres wing tip weight used balance both lift differential two wings overcome weight lines control system located inor attached tothe inboard wing amount weight proper level flight increased effectiveness G loads hard corner will therefore cause ship roll direction ularly known hinging making outboard flap little larg er corner being flown out board wing will have slightly greater crease lift thus offsetting increased G load tip weight Whew Engine offset helpful particularly instance lost line tension tends FREE BOAT KITS 48 pg Catalog SAVE ORY BUILT COST 20 power & sail models 11 30 Fiberglass hulls/decks lactoiy sembled install interior- no experience required Same lactonj-built FREE 48 P catalog LUGER BOAT KITS Dept MA-65 3800 W H ri Burnsville 7innesota 55337 612-890-3000 return ship end lines belongs same can said small amount rudder offset An adjustable rudder probably best alternative although have personally gone fixed surface airfoiled inside per Nobler have hap pier lack yet another adjustment make final design parameter influencing line tension leadout location relative CG location same established stability objective roughly 30 aft fore-and-aft location CG fuselage centerline An additional consideration very important building Stunter unusual planform such Al Rabes semi-scale ships dihedral con sider leadouts exit point relative vertical location CG should line arent say leadouts exit above CG flight CG will align itself exit point resulting aircraft banking toward resulting bank single effective way throwing away line ten sion short running out gas Well have lot mere say about line tension discussion flying trim now lets look Trim Objective Speed Control 158 Model Aviation SUPER SALE 14w . 441. tq. w q4 w41441f .Id ff.11 lb. Ob.h 14 hg .h3 14. 4 4 4w. Uty h.sddt .d . 14 4 dIb 4144 di , i 4w9 ha ii q.h. .l 4fr 114 d4S39 AS M.y 44, 1444. d&4. S144y BETA SU .d.4q C,444 h.14 4s4yd4* N COD VideoTech PO Box 1917-30086 Stone Mt GA 30086 SILICONE 10 foot coilsTUBING lD.062 092 125U S POST S/coil235 265 325 54/COIL LARRY DODGE AERO INC 10210 MANNINGSTILLWATER MN 55082 RIO First Series Great Flying Canards RIC Modeler Al Featuring fast service qualified people latest equipment including SPECTRUM ANAL YZER AM FM SIGNAL GENERATOR Call Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessories discounted prices 904 478-6745 RADIO SOUTH- AUTHORIZED SERVICE CENTER FOR Kroft Pro Line tabe JR 43 West Nine Mile Rd Pensacola FL 32514 * A Futaba Distributor er Inquiries Welcome * Speed control again influenced eripherally design considerations rimary attention will given flying hase Some things can however said speed airplane governed wo things thrust drag Heres mother irreverent statement Fan Reasonable amounts form drag shape object moving hrough air mass parasitic drag drag skin friction lines wheel etc s good thing Stunt ship hying engines operating signifi antly below horsepower potential ie much lower rpm figures opti mum part keep airspeed manage able sleeker make ship Faster goes given amount thrust rgo slower must run engine trgo lesser amount horsepower getting engine ad nauseum acceptingbut seek ingsources drag develop means whereby can operate engine zloser its peak horsepower los ng control speed So go ahead put bombs antennas big wheels etc.. however make sure youve really got horsepower available first Theres other form drag about cant cavalier thats induced drag drag induced pro duction lift again higher aspect ratios will reduce amount induced drag given amount lift Just sure consider caveats mentioned earlier about excessive aspect ratios TrackIng has several design aspects can discussed together have mentioned previously An explanation tracking may helpful maneuver descriptions require consecutive maneuvers flown concentrically. spot hin two feet track first maneuver Stunter locks-on rate turn round maneuver tends follow same radius smoothly little control input said track well requires con stant control trimming maintain ra dius input causes noticeable flat spots rounds poor tracking Lets consider Tail Volume again aspect ratio tail too high change lift minor control inputs will larger resulting noticeable pitch changes flat spots Thats fairly straightforward Less simple effects pitching moment CO C/L Flap Effects will consider together gets little controversial consider source lift required loop con stant Going up lift must oppose gravity pitching moment will large requir ing larger control inputs both overcome establish desired radius turn Over top loop coming down inverted required lift lessened inasmuch gravity lift now work gether reduction lift reduces pitching moment requires control backed off retain radius loop As can see greater variation pitching moment wing great er variation control input required pilot maintain constant radi us Therefore contrary popular opin ion adding nose weight proper solution tracking problems since will increase arm between CG C/L another sound argument keeping lift produced line lift required Continued page 160 Custom Built LD Models 2036 N Thetue Ave sne CA 93704 Order Phone 209 233-1050ask Bill LOVE fly HATE build Contact ve solution problem Kits Custom Built Order Sanded Ready Cover AndrewsGoldbergGreat PlanesEtc - IF1yWhatI3ui1d June 1985 159 Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% Lighter Sandable Carveable Excellent Gap Filling Non-Sagging Superior Strength $fl95 Sands Carves like Basswood l 16 81 oz Equal over 8 wt oz regular epoxys See dealer first write call PO Box 19784 St Paul MN 55119 715 425-1397 MODEL MAGIC PRODUCTS 0 Model Magic Filler 0 0 S S Comparison Chart Model Magic Product X Adhesion BalsaEacellent Foam Fiberglasa Strength Flesing Spreading FuelResistance SandingAs med balsa HardnessAs hard balsa FinishingAny finish/covering Shelf Lifetill used up TintAcceptanceExcellent water ResistExcellent 0 very Poor Soft balsa Soft balsa 5-7 inn very Poor Test methods data available request care enough fill very best insist Model Magic Filler Circtie Manic Filler r Super sport flier turnaround pattern esisa Construction 70 span 927 sq area $1 j 759859 lbs 75-12cu Dealer Inquiry Invited 3405 Cleveland Ave SW Canton OH 44707 Send $1 Catalog 1216 4846810 mm~~ROUSH MFG 31-lllllrlb S HANDLING Up $999 add $199 $891 $2909 add $229 $2901 $9590 add $300 $9591 $7099 add $309 over $7909 add $9 001 CA Addressees add 69 tax Send MO visa/McI#Exp Check lallow up 30 days CK clearancel COD Exact Charges plus $159 Hdl ICash Only 84 Page CATALE*uu*S $209 PP/tnt Class espy will oent free--when requested-with order HOBBY HORN 15173 Moran St [A] PO Box 2212 Westminster Ca 92699 1719 8938311 [Aft Nm 719 8951203] 160 Model Aviation Still own opinion flaps have strong effect tracking Particu larly influential spanwise distribu tion As flaps get shorter tracking suf fers Flaps should long span nar row chord Rule Thumb Fancher Flaps should full-span nearly chord should range 15% 20% wing chord depending air craft weight addition hingeline should straight Since Stunter flies constant left skid straight hingeline assures airflow across airfoil consistent possible entire span final design objective Uniformity Turn pitch prime design factor Decalage Decalage fancy term alignment wing tail blunt should no decalage Stunter centerlines wing tail matter thrust line must parallel Any misalignment of either design construc tion will result plane turns dif ferently inside versus outside Dont Secondarily aware locate large draggy parts airplane Uneven vertical distribution drag relative CG will result unequal turns No rules thumb must eyeball side view make educated guess drag distribution same goes drags opposite number thrust Dont mount engine pylon above tail expect ship turn well inside about winds up design phase Next month well preflight get started flying Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 gles Does mean surrender quite As Ted correctly pointed out ineffective tail surfaces elevator pushrod discon nected will cause violent nose-down response up-elevator down-flap control reversed control vengeance extreme deflected flaps create 75 in-lb nose-down mo ment tail surfaces produce 28 lb download 70 in-lb nose-up moment due elevators too small size too little deflection result will still reversed controls violently same flap deflection stronger tail surfaces produced 32-lb download 80 in-lb nose-up moment result would positive nose-up rotation response up-control application Lets put together have Stunt ship wing-bending load 50 lb 3-az change tail download causes turn Its opinion real work situation high ljfl required oppose high 0-loads tight corner Relatively little effort ex pended change body angle relatively little change body angle required airplane turn sharply Once again maneuvering body angle maximum loads should approximate body angle slow-speed stall case full-flap Stunt ship observe body angle such case slight thus insignificant pitchinsignificant P-factor statement does did read No pitchno P simply signs real effects P recognized addressed less importance effect precession applica tion full-flap Stunt ships summarize did suggest _______________________________.. aircr. can make abrupt pitch change. achieving posi CL Aerobatics/Rabetive geometrical angle attack. . did Continued page 71add sufficient proper accurate modi tion would closer 8 Gsfiers various statements such such airplane configuration .dramatically reduce body angle relative wind. t ships possible Id first admit its usually have small body angles land performance would akin stall little nose-up pitch elevator Stunt ship An air- statements flatly suggest plane would incapable Stunt pattern withit positive negative body an- Continued page 162 tilt $595 081 ozl taluezs t,eng Kepair Timer LaNtus 8 Gus axOEL c/I/todd Elt7LcL 9mm IREaKEr -tell eROOKLYN DOOcER 59 cabin WEST Retail $52 95*aINTRoDucToRY PRICE $3909 t930 Recerd Breaker 96 $6956 t939Zipper59$5356 t939 Kioud King 63 $4236 1991 Brigidier 56 $4976 t991 Super Ouaker 79 $7776 1940 So Long 5tS3936 t936 Buccaneer 09 $5996 1938 clipper MKI 72$ill56 1937 Dallaire tOt $7516 t93t Miss America 89 $7196 t991 Playboy Sr 50 $5116 1991 Playboy Jr 59 $3119 1938 Powerhouse 89 $5356 1990 Sailplane 78 $9976 1938 Trenton Terror 72 $9076 1990 Ranger 96$3t 96 1939 Korda Wake 99 $t916 1939 Mercury 72 6 kits qualify SAM events 1FF & RId feature highest quality machine cut & sanded parts Superior competition alt sheet atrip wood wire & window material Plans orig PP models easily convertible 3ch RIC KITS Sailpianes Electric power cas Hobby Horn SENSOAR Clider 78 9sl $1800 Midway Model GNOME RIC Hand Launch Glider$2900 Jolly Models FLINcER RIC HLG 50 Span $2990 Midway Model FAST EDDIE Aerobatic /09 Elec$t990 Jolly Models ELECTRIcUS Electric Clider 95s$3259 Leisure PLAYBOY SR 67 cear 95 Elect $3900 Astro ASTRO SPORT 37 Direct 99 Elect $2290 Leisure WASP 37 far Direct 95 Electrics $2250 Midway ULTRA MK iv 86 far Geared 09 EP $3999 Midway FLYING QUAKER 89 90-959 strake $6976 9ks/Midway DENNY JR 72 Alum camel $9396 9ks/Midwav BUZZARD BOMBSHELL 72$5196 FULL LINE OF ELECTRIC SYSTEMS 9 Parts Avail
Edition: Model Aviation - 1985/06
Page Numbers: 70, 155, 158, 159, 160
Control Line Aerobatics Ted Fancher LAST MONTH discussing Response Rate up point left off everything spoken namely pitching moment opposi tion desired pitch change Lets dis cuss make turn t way prime motivators elevators make pun correctly lift produced tail stab elevator its distance Center Gravi ty CG efficient tail pro ducing lift further lift pro duced CG leverage will apply about CG first over comes opposing pitching moment wings lift rotates aircraft about CG until pilot neutralizes controls Once should consider tail volume area times average chord area stab elevator should nor mally between 20% 25% wing area Both larger smaller areas have used no discernible advantage Area should juggled tail moment arrive desired tail effectiveness Longer arms generally effective increasing response tend make ship tail-heavy rapidly area does Higher aspect ratios tail sur faces will produce lift given angles elevator deflection will therefore responsive Again AR made too high smooth control inputs will difficult maintain instance round maneuvers will tend show little flat spots minor control cor rections create comparatively major pitch changes Notice dichotomy between implied preference fairly high aspect ratios response rate low aspect ratios stability Compromise compromise opt lower aspect ratios accept need deflection area obtain lift necessary given rate pitch change Speaking Control Deflection lets discuss conjunction Flap Elevator Ratio has stated some authorities 20 30 somesuch degrees control travel necessary perform hard stunt corner state ment true particular set conditions given airplane general rule designs amount control deflection given rate turn variable based airspeed aspect ratios especially CG rela tionship C/L center lift amount pitching moment will take control deflection given turn rate early flight full fuel tank Continued page 155 70Model Aviation Sgt Al Reed Orlando FL ST 46powered Imitation MA plan No280 placed third Advanced PAMPA category last King Orange Internats White wired blue trim West Germanys Natlenal Champion Dr Geza Egervary flew Marionette 18th place finish last years CL World Champs Chicopee MA Pheto Claus Makis Plotr Zawada Poland lies STpowered original calls Lucky 18 Piotr regu lar Polish Stunt team serious Stunt competitor Photo P Zawada Du-Bro Rocket City labels Paint color formula correction Pettit Paint Co makers Hobbypoxy paints rias just issued correction previously-published Royal Air Force ky Type S paint formula seems vhen formula originally published s clerical error caused omission fellow component company mixed paint correctly color chips issued orrect printed formula Arong mix paint according originally-published formula youll et light blue instead light green sh-blue Sky Type S supposed correct formula Sky Type S11 parts HlO White three parts H70 Gray ne part H26 Light Blue part 1147 Bright Yellow Send ideas photos etc CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 70 end flight CG has moved aft due fuel tank having consumed Inasmuch flaps elevator move unit ie fixed relationship other inasmuch lift mindlessly increased flaps result control deflection no con sideration amount lift actually necessary support G loads corner becomes obvious probably generating lift re quired given time case would frequently stall Stunters hard corners additional lift increases pitching moment means reduced rate pitch first began discussion response rate last month spoke pitch rate predictable controllable addition being rapid becomes important keep liftrequired/lift-produced equation balance Lift excess required G forces produced will accelerate ALL PURPOSE FOAM CU1TER Hands Off Cut II $10250 plus *800 ship ft handI Assembled Model HANDS OFF CUT II unique device cutting high quality foam wing cores hands off also cuts both sides same time Most modelers will amazed high quality smooth surface will achieve using device plus added ad vantage having wait until friends can come around help However just foam wing cutter HANDS OFF also capable cutting precision foam components such fuselage sections cowls tail surfaces HANDS OFF available two ways 1 completely assembled easy store fold up box includes handy 40 inch bow blocking up foam 2 hardware package assemble own board HANDS OFF CUT II requires 24 volt variable output power supply Hands Off Cut II Hardware PkgJ $8750 plus $3 ship ft hand 24 Volt Variable Output Power Supply$5250 plus $3 ship ft hand AY PRODUCTS INC aircraft direction change once pitching moment overcome surface sounds like good deal what actually occurs lift acts right angles wing chordline airplane leaps direction lift. rotating new body angle what seeking result airplane jumps hard corners making shapes difficult control rates final position difficult predict discussing lift lets talk about wing thickness has often stated should use thick 18% 20%-plus wings increase lift potential After 5008 Sandbeach Road Wichita Falls TX 76310 1 MOS9PCOPd Tel 1817692-4475 2 reading foregoing probably real ize no longer share opinion reasonable thickness desirable 12% ballpark figure prevent early flow separation stall very thick sections seldom needed sake lift Structural considerations probably important factor higher aspect ratio thicker wing should prevent flexing apt very controversial since dont feel extra thickness does partic ular harm thickness airfoil shape causes minimum drag increase much less significant lift area make wing thick like Continued page 158 Ota lime uairy sun IL ru Kit 41 WinaMpon lealne WpNo 3-Channel 5/C MyMNeNNO MAGNIFICENT RENDITION OF ALL-TINE FAVORITE AIRCRAFT RON AOREATI WON 95 SECOND PLACE AT THE 1906 NATIONALS Kit #103 $21 FREE FASAT SCALE COMPETITION WITH MODRL RUILT FROM THIS RIO THIS MODEL MAR ALSO SE FLOWN WITH ELECTRIC ROWERSend SOt Phone 703 2739593 Flyline Models Catalog FLYLINE MODELS INC PO Sax 2136 FaIrfax VirgInia 22031 USA MRC Grssshoppsr Rag6596 OsrPnlcs5799 June 1985 155 2IIciA FIaEROLASS & FOAM CONSTRUCTION PAl & AMA PATFERN 60-61 ENGINE #64 SPAN 704 sq AREA WEIGHT7 TO 8 LBS DEPENDING ON EQUIP BASIC KIT 95 DELUXE KIT 95 Call 1000 SM 900 PM Mss-Sat & MASThR CARD L S L MODEL DEALER & 01STMPG WAPRODUCTS ONOOJONNOES WAITED73W2 MNPIMWWNO COMEt 15131 3M5-eSIGORNI,NI ShIN M5547 ———---------- — 72 Volt Raltery. . 2999 Qlckchwgr2899 Prices Good Tb ough May15 h ALL MAJOR LINES CARRIED IN DEPTH Send stamped addressed enAMIOPe price list ac capt MC Visa Amer EXPRWNN Diners club money ders cashier checks PWEMOAMI chWcks held 21 days ShippingAdd $350 COD cash $195 extra Over size packages cost TX add 5% tas Prices subject change notice Stars Moans MsaSuI 106 Isa 12-5 506 4JFUB DESIGNS Body Pilot Kit eLightest Pilot aval lab 10 oLiteilke vinyl la tex rubber parts Easy assombie finish eBuild either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable oSome simple sewing required WeightPrice 1/6 Scale2oz*$ 795 1/4 Scale4oz$ 995 1/3Scale6oz*$1695 AWeightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit iSca I1SZ Weight Price 595 795 $1495 eLightest bust pilot available eLifelike vinyl latex rubber parts Easy assemble finish eBuild either barnstormer sportsman pilot sKit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send Si 00 current catalog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MO Allow 3 weeks check clear Sorry-No CODs Em11ju ml i [1 ox 279CU Park Falls WI 54552 IProudly Presents CL Aerobatics/Fancher Continued page 155 phenomenon also argues mod eration pursuit high aspect ratios virtues Because higher aspect ratios increase lift coefficient greater rate angle attack increases can seen excessively high ARs will induce same leaping-type accel eration sharp corners Only educat ed guess bet thats part reason Denny Adamisin tries fly very-high-AR stunters very slow speeds mitigate very rapid buildup lift would result combi nation high speed high lift coeffi cient given angle attack mans opinion Ever eaward Lets see what can design stages optimize line tension whole lot would seem perusal Trim Table last months column Thats basically truth can decide whether much following use tip weight wing asym metry engine offset leadout position rudder configuration part items act concert another insure can take advantage real source line tension engines horsepower actually produce themselves worth stating little can produce line tension great deal can lose design standpoint should consider wing asymmetry ie inboard wing larger equalize lift since flies slower outboard have National World Championship Stunters wing asym metry therefore conclude significantly important Thatll really ring some bells Its opinion again Since equal-panel wings require tip weight balance lift requirements both wings would opt certain amount asymmetry reduce need significant amounts weight long way CG wing asymmetry seems matter taste outboard flap should probably always slightly larger inboard Heres wing tip weight used balance both lift differential two wings overcome weight lines control system located inor attached tothe inboard wing amount weight proper level flight increased effectiveness G loads hard corner will therefore cause ship roll direction ularly known hinging making outboard flap little larg er corner being flown out board wing will have slightly greater crease lift thus offsetting increased G load tip weight Whew Engine offset helpful particularly instance lost line tension tends FREE BOAT KITS 48 pg Catalog SAVE ORY BUILT COST 20 power & sail models 11 30 Fiberglass hulls/decks lactoiy sembled install interior- no experience required Same lactonj-built FREE 48 P catalog LUGER BOAT KITS Dept MA-65 3800 W H ri Burnsville 7innesota 55337 612-890-3000 return ship end lines belongs same can said small amount rudder offset An adjustable rudder probably best alternative although have personally gone fixed surface airfoiled inside per Nobler have hap pier lack yet another adjustment make final design parameter influencing line tension leadout location relative CG location same established stability objective roughly 30 aft fore-and-aft location CG fuselage centerline An additional consideration very important building Stunter unusual planform such Al Rabes semi-scale ships dihedral con sider leadouts exit point relative vertical location CG should line arent say leadouts exit above CG flight CG will align itself exit point resulting aircraft banking toward resulting bank single effective way throwing away line ten sion short running out gas Well have lot mere say about line tension discussion flying trim now lets look Trim Objective Speed Control 158 Model Aviation SUPER SALE 14w . 441. tq. w q4 w41441f .Id ff.11 lb. Ob.h 14 hg .h3 14. 4 4 4w. Uty h.sddt .d . 14 4 dIb 4144 di , i 4w9 ha ii q.h. .l 4fr 114 d4S39 AS M.y 44, 1444. d&4. S144y BETA SU .d.4q C,444 h.14 4s4yd4* N COD VideoTech PO Box 1917-30086 Stone Mt GA 30086 SILICONE 10 foot coilsTUBING lD.062 092 125U S POST S/coil235 265 325 54/COIL LARRY DODGE AERO INC 10210 MANNINGSTILLWATER MN 55082 RIO First Series Great Flying Canards RIC Modeler Al Featuring fast service qualified people latest equipment including SPECTRUM ANAL YZER AM FM SIGNAL GENERATOR Call Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessories discounted prices 904 478-6745 RADIO SOUTH- AUTHORIZED SERVICE CENTER FOR Kroft Pro Line tabe JR 43 West Nine Mile Rd Pensacola FL 32514 * A Futaba Distributor er Inquiries Welcome * Speed control again influenced eripherally design considerations rimary attention will given flying hase Some things can however said speed airplane governed wo things thrust drag Heres mother irreverent statement Fan Reasonable amounts form drag shape object moving hrough air mass parasitic drag drag skin friction lines wheel etc s good thing Stunt ship hying engines operating signifi antly below horsepower potential ie much lower rpm figures opti mum part keep airspeed manage able sleeker make ship Faster goes given amount thrust rgo slower must run engine trgo lesser amount horsepower getting engine ad nauseum acceptingbut seek ingsources drag develop means whereby can operate engine zloser its peak horsepower los ng control speed So go ahead put bombs antennas big wheels etc.. however make sure youve really got horsepower available first Theres other form drag about cant cavalier thats induced drag drag induced pro duction lift again higher aspect ratios will reduce amount induced drag given amount lift Just sure consider caveats mentioned earlier about excessive aspect ratios TrackIng has several design aspects can discussed together have mentioned previously An explanation tracking may helpful maneuver descriptions require consecutive maneuvers flown concentrically. spot hin two feet track first maneuver Stunter locks-on rate turn round maneuver tends follow same radius smoothly little control input said track well requires con stant control trimming maintain ra dius input causes noticeable flat spots rounds poor tracking Lets consider Tail Volume again aspect ratio tail too high change lift minor control inputs will larger resulting noticeable pitch changes flat spots Thats fairly straightforward Less simple effects pitching moment CO C/L Flap Effects will consider together gets little controversial consider source lift required loop con stant Going up lift must oppose gravity pitching moment will large requir ing larger control inputs both overcome establish desired radius turn Over top loop coming down inverted required lift lessened inasmuch gravity lift now work gether reduction lift reduces pitching moment requires control backed off retain radius loop As can see greater variation pitching moment wing great er variation control input required pilot maintain constant radi us Therefore contrary popular opin ion adding nose weight proper solution tracking problems since will increase arm between CG C/L another sound argument keeping lift produced line lift required Continued page 160 Custom Built LD Models 2036 N Thetue Ave sne CA 93704 Order Phone 209 233-1050ask Bill LOVE fly HATE build Contact ve solution problem Kits Custom Built Order Sanded Ready Cover AndrewsGoldbergGreat PlanesEtc - IF1yWhatI3ui1d June 1985 159 Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% Lighter Sandable Carveable Excellent Gap Filling Non-Sagging Superior Strength $fl95 Sands Carves like Basswood l 16 81 oz Equal over 8 wt oz regular epoxys See dealer first write call PO Box 19784 St Paul MN 55119 715 425-1397 MODEL MAGIC PRODUCTS 0 Model Magic Filler 0 0 S S Comparison Chart Model Magic Product X Adhesion BalsaEacellent Foam Fiberglasa Strength Flesing Spreading FuelResistance SandingAs med balsa HardnessAs hard balsa FinishingAny finish/covering Shelf Lifetill used up TintAcceptanceExcellent water ResistExcellent 0 very Poor Soft balsa Soft balsa 5-7 inn very Poor Test methods data available request care enough fill very best insist Model Magic Filler Circtie Manic Filler r Super sport flier turnaround pattern esisa Construction 70 span 927 sq area $1 j 759859 lbs 75-12cu Dealer Inquiry Invited 3405 Cleveland Ave SW Canton OH 44707 Send $1 Catalog 1216 4846810 mm~~ROUSH MFG 31-lllllrlb S HANDLING Up $999 add $199 $891 $2909 add $229 $2901 $9590 add $300 $9591 $7099 add $309 over $7909 add $9 001 CA Addressees add 69 tax Send MO visa/McI#Exp Check lallow up 30 days CK clearancel COD Exact Charges plus $159 Hdl ICash Only 84 Page CATALE*uu*S $209 PP/tnt Class espy will oent free--when requested-with order HOBBY HORN 15173 Moran St [A] PO Box 2212 Westminster Ca 92699 1719 8938311 [Aft Nm 719 8951203] 160 Model Aviation Still own opinion flaps have strong effect tracking Particu larly influential spanwise distribu tion As flaps get shorter tracking suf fers Flaps should long span nar row chord Rule Thumb Fancher Flaps should full-span nearly chord should range 15% 20% wing chord depending air craft weight addition hingeline should straight Since Stunter flies constant left skid straight hingeline assures airflow across airfoil consistent possible entire span final design objective Uniformity Turn pitch prime design factor Decalage Decalage fancy term alignment wing tail blunt should no decalage Stunter centerlines wing tail matter thrust line must parallel Any misalignment of either design construc tion will result plane turns dif ferently inside versus outside Dont Secondarily aware locate large draggy parts airplane Uneven vertical distribution drag relative CG will result unequal turns No rules thumb must eyeball side view make educated guess drag distribution same goes drags opposite number thrust Dont mount engine pylon above tail expect ship turn well inside about winds up design phase Next month well preflight get started flying Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 gles Does mean surrender quite As Ted correctly pointed out ineffective tail surfaces elevator pushrod discon nected will cause violent nose-down response up-elevator down-flap control reversed control vengeance extreme deflected flaps create 75 in-lb nose-down mo ment tail surfaces produce 28 lb download 70 in-lb nose-up moment due elevators too small size too little deflection result will still reversed controls violently same flap deflection stronger tail surfaces produced 32-lb download 80 in-lb nose-up moment result would positive nose-up rotation response up-control application Lets put together have Stunt ship wing-bending load 50 lb 3-az change tail download causes turn Its opinion real work situation high ljfl required oppose high 0-loads tight corner Relatively little effort ex pended change body angle relatively little change body angle required airplane turn sharply Once again maneuvering body angle maximum loads should approximate body angle slow-speed stall case full-flap Stunt ship observe body angle such case slight thus insignificant pitchinsignificant P-factor statement does did read No pitchno P simply signs real effects P recognized addressed less importance effect precession applica tion full-flap Stunt ships summarize did suggest _______________________________.. aircr. can make abrupt pitch change. achieving posi CL Aerobatics/Rabetive geometrical angle attack. . did Continued page 71add sufficient proper accurate modi tion would closer 8 Gsfiers various statements such such airplane configuration .dramatically reduce body angle relative wind. t ships possible Id first admit its usually have small body angles land performance would akin stall little nose-up pitch elevator Stunt ship An air- statements flatly suggest plane would incapable Stunt pattern withit positive negative body an- Continued page 162 tilt $595 081 ozl taluezs t,eng Kepair Timer LaNtus 8 Gus axOEL c/I/todd Elt7LcL 9mm IREaKEr -tell eROOKLYN DOOcER 59 cabin WEST Retail $52 95*aINTRoDucToRY PRICE $3909 t930 Recerd Breaker 96 $6956 t939Zipper59$5356 t939 Kioud King 63 $4236 1991 Brigidier 56 $4976 t991 Super Ouaker 79 $7776 1940 So Long 5tS3936 t936 Buccaneer 09 $5996 1938 clipper MKI 72$ill56 1937 Dallaire tOt $7516 t93t Miss America 89 $7196 t991 Playboy Sr 50 $5116 1991 Playboy Jr 59 $3119 1938 Powerhouse 89 $5356 1990 Sailplane 78 $9976 1938 Trenton Terror 72 $9076 1990 Ranger 96$3t 96 1939 Korda Wake 99 $t916 1939 Mercury 72 6 kits qualify SAM events 1FF & RId feature highest quality machine cut & sanded parts Superior competition alt sheet atrip wood wire & window material Plans orig PP models easily convertible 3ch RIC KITS Sailpianes Electric power cas Hobby Horn SENSOAR Clider 78 9sl $1800 Midway Model GNOME RIC Hand Launch Glider$2900 Jolly Models FLINcER RIC HLG 50 Span $2990 Midway Model FAST EDDIE Aerobatic /09 Elec$t990 Jolly Models ELECTRIcUS Electric Clider 95s$3259 Leisure PLAYBOY SR 67 cear 95 Elect $3900 Astro ASTRO SPORT 37 Direct 99 Elect $2290 Leisure WASP 37 far Direct 95 Electrics $2250 Midway ULTRA MK iv 86 far Geared 09 EP $3999 Midway FLYING QUAKER 89 90-959 strake $6976 9ks/Midway DENNY JR 72 Alum camel $9396 9ks/Midwav BUZZARD BOMBSHELL 72$5196 FULL LINE OF ELECTRIC SYSTEMS 9 Parts Avail
Edition: Model Aviation - 1985/06
Page Numbers: 70, 155, 158, 159, 160
Control Line Aerobatics Ted Fancher LAST MONTH discussing Response Rate up point left off everything spoken namely pitching moment opposi tion desired pitch change Lets dis cuss make turn t way prime motivators elevators make pun correctly lift produced tail stab elevator its distance Center Gravi ty CG efficient tail pro ducing lift further lift pro duced CG leverage will apply about CG first over comes opposing pitching moment wings lift rotates aircraft about CG until pilot neutralizes controls Once should consider tail volume area times average chord area stab elevator should nor mally between 20% 25% wing area Both larger smaller areas have used no discernible advantage Area should juggled tail moment arrive desired tail effectiveness Longer arms generally effective increasing response tend make ship tail-heavy rapidly area does Higher aspect ratios tail sur faces will produce lift given angles elevator deflection will therefore responsive Again AR made too high smooth control inputs will difficult maintain instance round maneuvers will tend show little flat spots minor control cor rections create comparatively major pitch changes Notice dichotomy between implied preference fairly high aspect ratios response rate low aspect ratios stability Compromise compromise opt lower aspect ratios accept need deflection area obtain lift necessary given rate pitch change Speaking Control Deflection lets discuss conjunction Flap Elevator Ratio has stated some authorities 20 30 somesuch degrees control travel necessary perform hard stunt corner state ment true particular set conditions given airplane general rule designs amount control deflection given rate turn variable based airspeed aspect ratios especially CG rela tionship C/L center lift amount pitching moment will take control deflection given turn rate early flight full fuel tank Continued page 155 70Model Aviation Sgt Al Reed Orlando FL ST 46powered Imitation MA plan No280 placed third Advanced PAMPA category last King Orange Internats White wired blue trim West Germanys Natlenal Champion Dr Geza Egervary flew Marionette 18th place finish last years CL World Champs Chicopee MA Pheto Claus Makis Plotr Zawada Poland lies STpowered original calls Lucky 18 Piotr regu lar Polish Stunt team serious Stunt competitor Photo P Zawada Du-Bro Rocket City labels Paint color formula correction Pettit Paint Co makers Hobbypoxy paints rias just issued correction previously-published Royal Air Force ky Type S paint formula seems vhen formula originally published s clerical error caused omission fellow component company mixed paint correctly color chips issued orrect printed formula Arong mix paint according originally-published formula youll et light blue instead light green sh-blue Sky Type S supposed correct formula Sky Type S11 parts HlO White three parts H70 Gray ne part H26 Light Blue part 1147 Bright Yellow Send ideas photos etc CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 70 end flight CG has moved aft due fuel tank having consumed Inasmuch flaps elevator move unit ie fixed relationship other inasmuch lift mindlessly increased flaps result control deflection no con sideration amount lift actually necessary support G loads corner becomes obvious probably generating lift re quired given time case would frequently stall Stunters hard corners additional lift increases pitching moment means reduced rate pitch first began discussion response rate last month spoke pitch rate predictable controllable addition being rapid becomes important keep liftrequired/lift-produced equation balance Lift excess required G forces produced will accelerate ALL PURPOSE FOAM CU1TER Hands Off Cut II $10250 plus *800 ship ft handI Assembled Model HANDS OFF CUT II unique device cutting high quality foam wing cores hands off also cuts both sides same time Most modelers will amazed high quality smooth surface will achieve using device plus added ad vantage having wait until friends can come around help However just foam wing cutter HANDS OFF also capable cutting precision foam components such fuselage sections cowls tail surfaces HANDS OFF available two ways 1 completely assembled easy store fold up box includes handy 40 inch bow blocking up foam 2 hardware package assemble own board HANDS OFF CUT II requires 24 volt variable output power supply Hands Off Cut II Hardware PkgJ $8750 plus $3 ship ft hand 24 Volt Variable Output Power Supply$5250 plus $3 ship ft hand AY PRODUCTS INC aircraft direction change once pitching moment overcome surface sounds like good deal what actually occurs lift acts right angles wing chordline airplane leaps direction lift. rotating new body angle what seeking result airplane jumps hard corners making shapes difficult control rates final position difficult predict discussing lift lets talk about wing thickness has often stated should use thick 18% 20%-plus wings increase lift potential After 5008 Sandbeach Road Wichita Falls TX 76310 1 MOS9PCOPd Tel 1817692-4475 2 reading foregoing probably real ize no longer share opinion reasonable thickness desirable 12% ballpark figure prevent early flow separation stall very thick sections seldom needed sake lift Structural considerations probably important factor higher aspect ratio thicker wing should prevent flexing apt very controversial since dont feel extra thickness does partic ular harm thickness airfoil shape causes minimum drag increase much less significant lift area make wing thick like Continued page 158 Ota lime uairy sun IL ru Kit 41 WinaMpon lealne WpNo 3-Channel 5/C MyMNeNNO MAGNIFICENT RENDITION OF ALL-TINE FAVORITE AIRCRAFT RON AOREATI WON 95 SECOND PLACE AT THE 1906 NATIONALS Kit #103 $21 FREE FASAT SCALE COMPETITION WITH MODRL RUILT FROM THIS RIO THIS MODEL MAR ALSO SE FLOWN WITH ELECTRIC ROWERSend SOt Phone 703 2739593 Flyline Models Catalog FLYLINE MODELS INC PO Sax 2136 FaIrfax VirgInia 22031 USA MRC Grssshoppsr Rag6596 OsrPnlcs5799 June 1985 155 2IIciA FIaEROLASS & FOAM CONSTRUCTION PAl & AMA PATFERN 60-61 ENGINE #64 SPAN 704 sq AREA WEIGHT7 TO 8 LBS DEPENDING ON EQUIP BASIC KIT 95 DELUXE KIT 95 Call 1000 SM 900 PM Mss-Sat & MASThR CARD L S L MODEL DEALER & 01STMPG WAPRODUCTS ONOOJONNOES WAITED73W2 MNPIMWWNO COMEt 15131 3M5-eSIGORNI,NI ShIN M5547 ———---------- — 72 Volt Raltery. . 2999 Qlckchwgr2899 Prices Good Tb ough May15 h ALL MAJOR LINES CARRIED IN DEPTH Send stamped addressed enAMIOPe price list ac capt MC Visa Amer EXPRWNN Diners club money ders cashier checks PWEMOAMI chWcks held 21 days ShippingAdd $350 COD cash $195 extra Over size packages cost TX add 5% tas Prices subject change notice Stars Moans MsaSuI 106 Isa 12-5 506 4JFUB DESIGNS Body Pilot Kit eLightest Pilot aval lab 10 oLiteilke vinyl la tex rubber parts Easy assombie finish eBuild either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable oSome simple sewing required WeightPrice 1/6 Scale2oz*$ 795 1/4 Scale4oz$ 995 1/3Scale6oz*$1695 AWeightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit iSca I1SZ Weight Price 595 795 $1495 eLightest bust pilot available eLifelike vinyl latex rubber parts Easy assemble finish eBuild either barnstormer sportsman pilot sKit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send Si 00 current catalog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MO Allow 3 weeks check clear Sorry-No CODs Em11ju ml i [1 ox 279CU Park Falls WI 54552 IProudly Presents CL Aerobatics/Fancher Continued page 155 phenomenon also argues mod eration pursuit high aspect ratios virtues Because higher aspect ratios increase lift coefficient greater rate angle attack increases can seen excessively high ARs will induce same leaping-type accel eration sharp corners Only educat ed guess bet thats part reason Denny Adamisin tries fly very-high-AR stunters very slow speeds mitigate very rapid buildup lift would result combi nation high speed high lift coeffi cient given angle attack mans opinion Ever eaward Lets see what can design stages optimize line tension whole lot would seem perusal Trim Table last months column Thats basically truth can decide whether much following use tip weight wing asym metry engine offset leadout position rudder configuration part items act concert another insure can take advantage real source line tension engines horsepower actually produce themselves worth stating little can produce line tension great deal can lose design standpoint should consider wing asymmetry ie inboard wing larger equalize lift since flies slower outboard have National World Championship Stunters wing asym metry therefore conclude significantly important Thatll really ring some bells Its opinion again Since equal-panel wings require tip weight balance lift requirements both wings would opt certain amount asymmetry reduce need significant amounts weight long way CG wing asymmetry seems matter taste outboard flap should probably always slightly larger inboard Heres wing tip weight used balance both lift differential two wings overcome weight lines control system located inor attached tothe inboard wing amount weight proper level flight increased effectiveness G loads hard corner will therefore cause ship roll direction ularly known hinging making outboard flap little larg er corner being flown out board wing will have slightly greater crease lift thus offsetting increased G load tip weight Whew Engine offset helpful particularly instance lost line tension tends FREE BOAT KITS 48 pg Catalog SAVE ORY BUILT COST 20 power & sail models 11 30 Fiberglass hulls/decks lactoiy sembled install interior- no experience required Same lactonj-built FREE 48 P catalog LUGER BOAT KITS Dept MA-65 3800 W H ri Burnsville 7innesota 55337 612-890-3000 return ship end lines belongs same can said small amount rudder offset An adjustable rudder probably best alternative although have personally gone fixed surface airfoiled inside per Nobler have hap pier lack yet another adjustment make final design parameter influencing line tension leadout location relative CG location same established stability objective roughly 30 aft fore-and-aft location CG fuselage centerline An additional consideration very important building Stunter unusual planform such Al Rabes semi-scale ships dihedral con sider leadouts exit point relative vertical location CG should line arent say leadouts exit above CG flight CG will align itself exit point resulting aircraft banking toward resulting bank single effective way throwing away line ten sion short running out gas Well have lot mere say about line tension discussion flying trim now lets look Trim Objective Speed Control 158 Model Aviation SUPER SALE 14w . 441. tq. w q4 w41441f .Id ff.11 lb. Ob.h 14 hg .h3 14. 4 4 4w. Uty h.sddt .d . 14 4 dIb 4144 di , i 4w9 ha ii q.h. .l 4fr 114 d4S39 AS M.y 44, 1444. d&4. S144y BETA SU .d.4q C,444 h.14 4s4yd4* N COD VideoTech PO Box 1917-30086 Stone Mt GA 30086 SILICONE 10 foot coilsTUBING lD.062 092 125U S POST S/coil235 265 325 54/COIL LARRY DODGE AERO INC 10210 MANNINGSTILLWATER MN 55082 RIO First Series Great Flying Canards RIC Modeler Al Featuring fast service qualified people latest equipment including SPECTRUM ANAL YZER AM FM SIGNAL GENERATOR Call Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessories discounted prices 904 478-6745 RADIO SOUTH- AUTHORIZED SERVICE CENTER FOR Kroft Pro Line tabe JR 43 West Nine Mile Rd Pensacola FL 32514 * A Futaba Distributor er Inquiries Welcome * Speed control again influenced eripherally design considerations rimary attention will given flying hase Some things can however said speed airplane governed wo things thrust drag Heres mother irreverent statement Fan Reasonable amounts form drag shape object moving hrough air mass parasitic drag drag skin friction lines wheel etc s good thing Stunt ship hying engines operating signifi antly below horsepower potential ie much lower rpm figures opti mum part keep airspeed manage able sleeker make ship Faster goes given amount thrust rgo slower must run engine trgo lesser amount horsepower getting engine ad nauseum acceptingbut seek ingsources drag develop means whereby can operate engine zloser its peak horsepower los ng control speed So go ahead put bombs antennas big wheels etc.. however make sure youve really got horsepower available first Theres other form drag about cant cavalier thats induced drag drag induced pro duction lift again higher aspect ratios will reduce amount induced drag given amount lift Just sure consider caveats mentioned earlier about excessive aspect ratios TrackIng has several design aspects can discussed together have mentioned previously An explanation tracking may helpful maneuver descriptions require consecutive maneuvers flown concentrically. spot hin two feet track first maneuver Stunter locks-on rate turn round maneuver tends follow same radius smoothly little control input said track well requires con stant control trimming maintain ra dius input causes noticeable flat spots rounds poor tracking Lets consider Tail Volume again aspect ratio tail too high change lift minor control inputs will larger resulting noticeable pitch changes flat spots Thats fairly straightforward Less simple effects pitching moment CO C/L Flap Effects will consider together gets little controversial consider source lift required loop con stant Going up lift must oppose gravity pitching moment will large requir ing larger control inputs both overcome establish desired radius turn Over top loop coming down inverted required lift lessened inasmuch gravity lift now work gether reduction lift reduces pitching moment requires control backed off retain radius loop As can see greater variation pitching moment wing great er variation control input required pilot maintain constant radi us Therefore contrary popular opin ion adding nose weight proper solution tracking problems since will increase arm between CG C/L another sound argument keeping lift produced line lift required Continued page 160 Custom Built LD Models 2036 N Thetue Ave sne CA 93704 Order Phone 209 233-1050ask Bill LOVE fly HATE build Contact ve solution problem Kits Custom Built Order Sanded Ready Cover AndrewsGoldbergGreat PlanesEtc - IF1yWhatI3ui1d June 1985 159 Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% Lighter Sandable Carveable Excellent Gap Filling Non-Sagging Superior Strength $fl95 Sands Carves like Basswood l 16 81 oz Equal over 8 wt oz regular epoxys See dealer first write call PO Box 19784 St Paul MN 55119 715 425-1397 MODEL MAGIC PRODUCTS 0 Model Magic Filler 0 0 S S Comparison Chart Model Magic Product X Adhesion BalsaEacellent Foam Fiberglasa Strength Flesing Spreading FuelResistance SandingAs med balsa HardnessAs hard balsa FinishingAny finish/covering Shelf Lifetill used up TintAcceptanceExcellent water ResistExcellent 0 very Poor Soft balsa Soft balsa 5-7 inn very Poor Test methods data available request care enough fill very best insist Model Magic Filler Circtie Manic Filler r Super sport flier turnaround pattern esisa Construction 70 span 927 sq area $1 j 759859 lbs 75-12cu Dealer Inquiry Invited 3405 Cleveland Ave SW Canton OH 44707 Send $1 Catalog 1216 4846810 mm~~ROUSH MFG 31-lllllrlb S HANDLING Up $999 add $199 $891 $2909 add $229 $2901 $9590 add $300 $9591 $7099 add $309 over $7909 add $9 001 CA Addressees add 69 tax Send MO visa/McI#Exp Check lallow up 30 days CK clearancel COD Exact Charges plus $159 Hdl ICash Only 84 Page CATALE*uu*S $209 PP/tnt Class espy will oent free--when requested-with order HOBBY HORN 15173 Moran St [A] PO Box 2212 Westminster Ca 92699 1719 8938311 [Aft Nm 719 8951203] 160 Model Aviation Still own opinion flaps have strong effect tracking Particu larly influential spanwise distribu tion As flaps get shorter tracking suf fers Flaps should long span nar row chord Rule Thumb Fancher Flaps should full-span nearly chord should range 15% 20% wing chord depending air craft weight addition hingeline should straight Since Stunter flies constant left skid straight hingeline assures airflow across airfoil consistent possible entire span final design objective Uniformity Turn pitch prime design factor Decalage Decalage fancy term alignment wing tail blunt should no decalage Stunter centerlines wing tail matter thrust line must parallel Any misalignment of either design construc tion will result plane turns dif ferently inside versus outside Dont Secondarily aware locate large draggy parts airplane Uneven vertical distribution drag relative CG will result unequal turns No rules thumb must eyeball side view make educated guess drag distribution same goes drags opposite number thrust Dont mount engine pylon above tail expect ship turn well inside about winds up design phase Next month well preflight get started flying Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 gles Does mean surrender quite As Ted correctly pointed out ineffective tail surfaces elevator pushrod discon nected will cause violent nose-down response up-elevator down-flap control reversed control vengeance extreme deflected flaps create 75 in-lb nose-down mo ment tail surfaces produce 28 lb download 70 in-lb nose-up moment due elevators too small size too little deflection result will still reversed controls violently same flap deflection stronger tail surfaces produced 32-lb download 80 in-lb nose-up moment result would positive nose-up rotation response up-control application Lets put together have Stunt ship wing-bending load 50 lb 3-az change tail download causes turn Its opinion real work situation high ljfl required oppose high 0-loads tight corner Relatively little effort ex pended change body angle relatively little change body angle required airplane turn sharply Once again maneuvering body angle maximum loads should approximate body angle slow-speed stall case full-flap Stunt ship observe body angle such case slight thus insignificant pitchinsignificant P-factor statement does did read No pitchno P simply signs real effects P recognized addressed less importance effect precession applica tion full-flap Stunt ships summarize did suggest _______________________________.. aircr. can make abrupt pitch change. achieving posi CL Aerobatics/Rabetive geometrical angle attack. . did Continued page 71add sufficient proper accurate modi tion would closer 8 Gsfiers various statements such such airplane configuration .dramatically reduce body angle relative wind. t ships possible Id first admit its usually have small body angles land performance would akin stall little nose-up pitch elevator Stunt ship An air- statements flatly suggest plane would incapable Stunt pattern withit positive negative body an- Continued page 162 tilt $595 081 ozl taluezs t,eng Kepair Timer LaNtus 8 Gus axOEL c/I/todd Elt7LcL 9mm IREaKEr -tell eROOKLYN DOOcER 59 cabin WEST Retail $52 95*aINTRoDucToRY PRICE $3909 t930 Recerd Breaker 96 $6956 t939Zipper59$5356 t939 Kioud King 63 $4236 1991 Brigidier 56 $4976 t991 Super Ouaker 79 $7776 1940 So Long 5tS3936 t936 Buccaneer 09 $5996 1938 clipper MKI 72$ill56 1937 Dallaire tOt $7516 t93t Miss America 89 $7196 t991 Playboy Sr 50 $5116 1991 Playboy Jr 59 $3119 1938 Powerhouse 89 $5356 1990 Sailplane 78 $9976 1938 Trenton Terror 72 $9076 1990 Ranger 96$3t 96 1939 Korda Wake 99 $t916 1939 Mercury 72 6 kits qualify SAM events 1FF & RId feature highest quality machine cut & sanded parts Superior competition alt sheet atrip wood wire & window material Plans orig PP models easily convertible 3ch RIC KITS Sailpianes Electric power cas Hobby Horn SENSOAR Clider 78 9sl $1800 Midway Model GNOME RIC Hand Launch Glider$2900 Jolly Models FLINcER RIC HLG 50 Span $2990 Midway Model FAST EDDIE Aerobatic /09 Elec$t990 Jolly Models ELECTRIcUS Electric Clider 95s$3259 Leisure PLAYBOY SR 67 cear 95 Elect $3900 Astro ASTRO SPORT 37 Direct 99 Elect $2290 Leisure WASP 37 far Direct 95 Electrics $2250 Midway ULTRA MK iv 86 far Geared 09 EP $3999 Midway FLYING QUAKER 89 90-959 strake $6976 9ks/Midway DENNY JR 72 Alum camel $9396 9ks/Midwav BUZZARD BOMBSHELL 72$5196 FULL LINE OF ELECTRIC SYSTEMS 9 Parts Avail
Edition: Model Aviation - 1985/06
Page Numbers: 70, 155, 158, 159, 160
Control Line Aerobatics Ted Fancher LAST MONTH discussing Response Rate up point left off everything spoken namely pitching moment opposi tion desired pitch change Lets dis cuss make turn t way prime motivators elevators make pun correctly lift produced tail stab elevator its distance Center Gravi ty CG efficient tail pro ducing lift further lift pro duced CG leverage will apply about CG first over comes opposing pitching moment wings lift rotates aircraft about CG until pilot neutralizes controls Once should consider tail volume area times average chord area stab elevator should nor mally between 20% 25% wing area Both larger smaller areas have used no discernible advantage Area should juggled tail moment arrive desired tail effectiveness Longer arms generally effective increasing response tend make ship tail-heavy rapidly area does Higher aspect ratios tail sur faces will produce lift given angles elevator deflection will therefore responsive Again AR made too high smooth control inputs will difficult maintain instance round maneuvers will tend show little flat spots minor control cor rections create comparatively major pitch changes Notice dichotomy between implied preference fairly high aspect ratios response rate low aspect ratios stability Compromise compromise opt lower aspect ratios accept need deflection area obtain lift necessary given rate pitch change Speaking Control Deflection lets discuss conjunction Flap Elevator Ratio has stated some authorities 20 30 somesuch degrees control travel necessary perform hard stunt corner state ment true particular set conditions given airplane general rule designs amount control deflection given rate turn variable based airspeed aspect ratios especially CG rela tionship C/L center lift amount pitching moment will take control deflection given turn rate early flight full fuel tank Continued page 155 70Model Aviation Sgt Al Reed Orlando FL ST 46powered Imitation MA plan No280 placed third Advanced PAMPA category last King Orange Internats White wired blue trim West Germanys Natlenal Champion Dr Geza Egervary flew Marionette 18th place finish last years CL World Champs Chicopee MA Pheto Claus Makis Plotr Zawada Poland lies STpowered original calls Lucky 18 Piotr regu lar Polish Stunt team serious Stunt competitor Photo P Zawada Du-Bro Rocket City labels Paint color formula correction Pettit Paint Co makers Hobbypoxy paints rias just issued correction previously-published Royal Air Force ky Type S paint formula seems vhen formula originally published s clerical error caused omission fellow component company mixed paint correctly color chips issued orrect printed formula Arong mix paint according originally-published formula youll et light blue instead light green sh-blue Sky Type S supposed correct formula Sky Type S11 parts HlO White three parts H70 Gray ne part H26 Light Blue part 1147 Bright Yellow Send ideas photos etc CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 70 end flight CG has moved aft due fuel tank having consumed Inasmuch flaps elevator move unit ie fixed relationship other inasmuch lift mindlessly increased flaps result control deflection no con sideration amount lift actually necessary support G loads corner becomes obvious probably generating lift re quired given time case would frequently stall Stunters hard corners additional lift increases pitching moment means reduced rate pitch first began discussion response rate last month spoke pitch rate predictable controllable addition being rapid becomes important keep liftrequired/lift-produced equation balance Lift excess required G forces produced will accelerate ALL PURPOSE FOAM CU1TER Hands Off Cut II $10250 plus *800 ship ft handI Assembled Model HANDS OFF CUT II unique device cutting high quality foam wing cores hands off also cuts both sides same time Most modelers will amazed high quality smooth surface will achieve using device plus added ad vantage having wait until friends can come around help However just foam wing cutter HANDS OFF also capable cutting precision foam components such fuselage sections cowls tail surfaces HANDS OFF available two ways 1 completely assembled easy store fold up box includes handy 40 inch bow blocking up foam 2 hardware package assemble own board HANDS OFF CUT II requires 24 volt variable output power supply Hands Off Cut II Hardware PkgJ $8750 plus $3 ship ft hand 24 Volt Variable Output Power Supply$5250 plus $3 ship ft hand AY PRODUCTS INC aircraft direction change once pitching moment overcome surface sounds like good deal what actually occurs lift acts right angles wing chordline airplane leaps direction lift. rotating new body angle what seeking result airplane jumps hard corners making shapes difficult control rates final position difficult predict discussing lift lets talk about wing thickness has often stated should use thick 18% 20%-plus wings increase lift potential After 5008 Sandbeach Road Wichita Falls TX 76310 1 MOS9PCOPd Tel 1817692-4475 2 reading foregoing probably real ize no longer share opinion reasonable thickness desirable 12% ballpark figure prevent early flow separation stall very thick sections seldom needed sake lift Structural considerations probably important factor higher aspect ratio thicker wing should prevent flexing apt very controversial since dont feel extra thickness does partic ular harm thickness airfoil shape causes minimum drag increase much less significant lift area make wing thick like Continued page 158 Ota lime uairy sun IL ru Kit 41 WinaMpon lealne WpNo 3-Channel 5/C MyMNeNNO MAGNIFICENT RENDITION OF ALL-TINE FAVORITE AIRCRAFT RON AOREATI WON 95 SECOND PLACE AT THE 1906 NATIONALS Kit #103 $21 FREE FASAT SCALE COMPETITION WITH MODRL RUILT FROM THIS RIO THIS MODEL MAR ALSO SE FLOWN WITH ELECTRIC ROWERSend SOt Phone 703 2739593 Flyline Models Catalog FLYLINE MODELS INC PO Sax 2136 FaIrfax VirgInia 22031 USA MRC Grssshoppsr Rag6596 OsrPnlcs5799 June 1985 155 2IIciA FIaEROLASS & FOAM CONSTRUCTION PAl & AMA PATFERN 60-61 ENGINE #64 SPAN 704 sq AREA WEIGHT7 TO 8 LBS DEPENDING ON EQUIP BASIC KIT 95 DELUXE KIT 95 Call 1000 SM 900 PM Mss-Sat & MASThR CARD L S L MODEL DEALER & 01STMPG WAPRODUCTS ONOOJONNOES WAITED73W2 MNPIMWWNO COMEt 15131 3M5-eSIGORNI,NI ShIN M5547 ———---------- — 72 Volt Raltery. . 2999 Qlckchwgr2899 Prices Good Tb ough May15 h ALL MAJOR LINES CARRIED IN DEPTH Send stamped addressed enAMIOPe price list ac capt MC Visa Amer EXPRWNN Diners club money ders cashier checks PWEMOAMI chWcks held 21 days ShippingAdd $350 COD cash $195 extra Over size packages cost TX add 5% tas Prices subject change notice Stars Moans MsaSuI 106 Isa 12-5 506 4JFUB DESIGNS Body Pilot Kit eLightest Pilot aval lab 10 oLiteilke vinyl la tex rubber parts Easy assombie finish eBuild either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable oSome simple sewing required WeightPrice 1/6 Scale2oz*$ 795 1/4 Scale4oz$ 995 1/3Scale6oz*$1695 AWeightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit iSca I1SZ Weight Price 595 795 $1495 eLightest bust pilot available eLifelike vinyl latex rubber parts Easy assemble finish eBuild either barnstormer sportsman pilot sKit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send Si 00 current catalog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MO Allow 3 weeks check clear Sorry-No CODs Em11ju ml i [1 ox 279CU Park Falls WI 54552 IProudly Presents CL Aerobatics/Fancher Continued page 155 phenomenon also argues mod eration pursuit high aspect ratios virtues Because higher aspect ratios increase lift coefficient greater rate angle attack increases can seen excessively high ARs will induce same leaping-type accel eration sharp corners Only educat ed guess bet thats part reason Denny Adamisin tries fly very-high-AR stunters very slow speeds mitigate very rapid buildup lift would result combi nation high speed high lift coeffi cient given angle attack mans opinion Ever eaward Lets see what can design stages optimize line tension whole lot would seem perusal Trim Table last months column Thats basically truth can decide whether much following use tip weight wing asym metry engine offset leadout position rudder configuration part items act concert another insure can take advantage real source line tension engines horsepower actually produce themselves worth stating little can produce line tension great deal can lose design standpoint should consider wing asymmetry ie inboard wing larger equalize lift since flies slower outboard have National World Championship Stunters wing asym metry therefore conclude significantly important Thatll really ring some bells Its opinion again Since equal-panel wings require tip weight balance lift requirements both wings would opt certain amount asymmetry reduce need significant amounts weight long way CG wing asymmetry seems matter taste outboard flap should probably always slightly larger inboard Heres wing tip weight used balance both lift differential two wings overcome weight lines control system located inor attached tothe inboard wing amount weight proper level flight increased effectiveness G loads hard corner will therefore cause ship roll direction ularly known hinging making outboard flap little larg er corner being flown out board wing will have slightly greater crease lift thus offsetting increased G load tip weight Whew Engine offset helpful particularly instance lost line tension tends FREE BOAT KITS 48 pg Catalog SAVE ORY BUILT COST 20 power & sail models 11 30 Fiberglass hulls/decks lactoiy sembled install interior- no experience required Same lactonj-built FREE 48 P catalog LUGER BOAT KITS Dept MA-65 3800 W H ri Burnsville 7innesota 55337 612-890-3000 return ship end lines belongs same can said small amount rudder offset An adjustable rudder probably best alternative although have personally gone fixed surface airfoiled inside per Nobler have hap pier lack yet another adjustment make final design parameter influencing line tension leadout location relative CG location same established stability objective roughly 30 aft fore-and-aft location CG fuselage centerline An additional consideration very important building Stunter unusual planform such Al Rabes semi-scale ships dihedral con sider leadouts exit point relative vertical location CG should line arent say leadouts exit above CG flight CG will align itself exit point resulting aircraft banking toward resulting bank single effective way throwing away line ten sion short running out gas Well have lot mere say about line tension discussion flying trim now lets look Trim Objective Speed Control 158 Model Aviation SUPER SALE 14w . 441. tq. w q4 w41441f .Id ff.11 lb. Ob.h 14 hg .h3 14. 4 4 4w. Uty h.sddt .d . 14 4 dIb 4144 di , i 4w9 ha ii q.h. .l 4fr 114 d4S39 AS M.y 44, 1444. d&4. S144y BETA SU .d.4q C,444 h.14 4s4yd4* N COD VideoTech PO Box 1917-30086 Stone Mt GA 30086 SILICONE 10 foot coilsTUBING lD.062 092 125U S POST S/coil235 265 325 54/COIL LARRY DODGE AERO INC 10210 MANNINGSTILLWATER MN 55082 RIO First Series Great Flying Canards RIC Modeler Al Featuring fast service qualified people latest equipment including SPECTRUM ANAL YZER AM FM SIGNAL GENERATOR Call Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessories discounted prices 904 478-6745 RADIO SOUTH- AUTHORIZED SERVICE CENTER FOR Kroft Pro Line tabe JR 43 West Nine Mile Rd Pensacola FL 32514 * A Futaba Distributor er Inquiries Welcome * Speed control again influenced eripherally design considerations rimary attention will given flying hase Some things can however said speed airplane governed wo things thrust drag Heres mother irreverent statement Fan Reasonable amounts form drag shape object moving hrough air mass parasitic drag drag skin friction lines wheel etc s good thing Stunt ship hying engines operating signifi antly below horsepower potential ie much lower rpm figures opti mum part keep airspeed manage able sleeker make ship Faster goes given amount thrust rgo slower must run engine trgo lesser amount horsepower getting engine ad nauseum acceptingbut seek ingsources drag develop means whereby can operate engine zloser its peak horsepower los ng control speed So go ahead put bombs antennas big wheels etc.. however make sure youve really got horsepower available first Theres other form drag about cant cavalier thats induced drag drag induced pro duction lift again higher aspect ratios will reduce amount induced drag given amount lift Just sure consider caveats mentioned earlier about excessive aspect ratios TrackIng has several design aspects can discussed together have mentioned previously An explanation tracking may helpful maneuver descriptions require consecutive maneuvers flown concentrically. spot hin two feet track first maneuver Stunter locks-on rate turn round maneuver tends follow same radius smoothly little control input said track well requires con stant control trimming maintain ra dius input causes noticeable flat spots rounds poor tracking Lets consider Tail Volume again aspect ratio tail too high change lift minor control inputs will larger resulting noticeable pitch changes flat spots Thats fairly straightforward Less simple effects pitching moment CO C/L Flap Effects will consider together gets little controversial consider source lift required loop con stant Going up lift must oppose gravity pitching moment will large requir ing larger control inputs both overcome establish desired radius turn Over top loop coming down inverted required lift lessened inasmuch gravity lift now work gether reduction lift reduces pitching moment requires control backed off retain radius loop As can see greater variation pitching moment wing great er variation control input required pilot maintain constant radi us Therefore contrary popular opin ion adding nose weight proper solution tracking problems since will increase arm between CG C/L another sound argument keeping lift produced line lift required Continued page 160 Custom Built LD Models 2036 N Thetue Ave sne CA 93704 Order Phone 209 233-1050ask Bill LOVE fly HATE build Contact ve solution problem Kits Custom Built Order Sanded Ready Cover AndrewsGoldbergGreat PlanesEtc - IF1yWhatI3ui1d June 1985 159 Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% Lighter Sandable Carveable Excellent Gap Filling Non-Sagging Superior Strength $fl95 Sands Carves like Basswood l 16 81 oz Equal over 8 wt oz regular epoxys See dealer first write call PO Box 19784 St Paul MN 55119 715 425-1397 MODEL MAGIC PRODUCTS 0 Model Magic Filler 0 0 S S Comparison Chart Model Magic Product X Adhesion BalsaEacellent Foam Fiberglasa Strength Flesing Spreading FuelResistance SandingAs med balsa HardnessAs hard balsa FinishingAny finish/covering Shelf Lifetill used up TintAcceptanceExcellent water ResistExcellent 0 very Poor Soft balsa Soft balsa 5-7 inn very Poor Test methods data available request care enough fill very best insist Model Magic Filler Circtie Manic Filler r Super sport flier turnaround pattern esisa Construction 70 span 927 sq area $1 j 759859 lbs 75-12cu Dealer Inquiry Invited 3405 Cleveland Ave SW Canton OH 44707 Send $1 Catalog 1216 4846810 mm~~ROUSH MFG 31-lllllrlb S HANDLING Up $999 add $199 $891 $2909 add $229 $2901 $9590 add $300 $9591 $7099 add $309 over $7909 add $9 001 CA Addressees add 69 tax Send MO visa/McI#Exp Check lallow up 30 days CK clearancel COD Exact Charges plus $159 Hdl ICash Only 84 Page CATALE*uu*S $209 PP/tnt Class espy will oent free--when requested-with order HOBBY HORN 15173 Moran St [A] PO Box 2212 Westminster Ca 92699 1719 8938311 [Aft Nm 719 8951203] 160 Model Aviation Still own opinion flaps have strong effect tracking Particu larly influential spanwise distribu tion As flaps get shorter tracking suf fers Flaps should long span nar row chord Rule Thumb Fancher Flaps should full-span nearly chord should range 15% 20% wing chord depending air craft weight addition hingeline should straight Since Stunter flies constant left skid straight hingeline assures airflow across airfoil consistent possible entire span final design objective Uniformity Turn pitch prime design factor Decalage Decalage fancy term alignment wing tail blunt should no decalage Stunter centerlines wing tail matter thrust line must parallel Any misalignment of either design construc tion will result plane turns dif ferently inside versus outside Dont Secondarily aware locate large draggy parts airplane Uneven vertical distribution drag relative CG will result unequal turns No rules thumb must eyeball side view make educated guess drag distribution same goes drags opposite number thrust Dont mount engine pylon above tail expect ship turn well inside about winds up design phase Next month well preflight get started flying Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 gles Does mean surrender quite As Ted correctly pointed out ineffective tail surfaces elevator pushrod discon nected will cause violent nose-down response up-elevator down-flap control reversed control vengeance extreme deflected flaps create 75 in-lb nose-down mo ment tail surfaces produce 28 lb download 70 in-lb nose-up moment due elevators too small size too little deflection result will still reversed controls violently same flap deflection stronger tail surfaces produced 32-lb download 80 in-lb nose-up moment result would positive nose-up rotation response up-control application Lets put together have Stunt ship wing-bending load 50 lb 3-az change tail download causes turn Its opinion real work situation high ljfl required oppose high 0-loads tight corner Relatively little effort ex pended change body angle relatively little change body angle required airplane turn sharply Once again maneuvering body angle maximum loads should approximate body angle slow-speed stall case full-flap Stunt ship observe body angle such case slight thus insignificant pitchinsignificant P-factor statement does did read No pitchno P simply signs real effects P recognized addressed less importance effect precession applica tion full-flap Stunt ships summarize did suggest _______________________________.. aircr. can make abrupt pitch change. achieving posi CL Aerobatics/Rabetive geometrical angle attack. . did Continued page 71add sufficient proper accurate modi tion would closer 8 Gsfiers various statements such such airplane configuration .dramatically reduce body angle relative wind. t ships possible Id first admit its usually have small body angles land performance would akin stall little nose-up pitch elevator Stunt ship An air- statements flatly suggest plane would incapable Stunt pattern withit positive negative body an- Continued page 162 tilt $595 081 ozl taluezs t,eng Kepair Timer LaNtus 8 Gus axOEL c/I/todd Elt7LcL 9mm IREaKEr -tell eROOKLYN DOOcER 59 cabin WEST Retail $52 95*aINTRoDucToRY PRICE $3909 t930 Recerd Breaker 96 $6956 t939Zipper59$5356 t939 Kioud King 63 $4236 1991 Brigidier 56 $4976 t991 Super Ouaker 79 $7776 1940 So Long 5tS3936 t936 Buccaneer 09 $5996 1938 clipper MKI 72$ill56 1937 Dallaire tOt $7516 t93t Miss America 89 $7196 t991 Playboy Sr 50 $5116 1991 Playboy Jr 59 $3119 1938 Powerhouse 89 $5356 1990 Sailplane 78 $9976 1938 Trenton Terror 72 $9076 1990 Ranger 96$3t 96 1939 Korda Wake 99 $t916 1939 Mercury 72 6 kits qualify SAM events 1FF & RId feature highest quality machine cut & sanded parts Superior competition alt sheet atrip wood wire & window material Plans orig PP models easily convertible 3ch RIC KITS Sailpianes Electric power cas Hobby Horn SENSOAR Clider 78 9sl $1800 Midway Model GNOME RIC Hand Launch Glider$2900 Jolly Models FLINcER RIC HLG 50 Span $2990 Midway Model FAST EDDIE Aerobatic /09 Elec$t990 Jolly Models ELECTRIcUS Electric Clider 95s$3259 Leisure PLAYBOY SR 67 cear 95 Elect $3900 Astro ASTRO SPORT 37 Direct 99 Elect $2290 Leisure WASP 37 far Direct 95 Electrics $2250 Midway ULTRA MK iv 86 far Geared 09 EP $3999 Midway FLYING QUAKER 89 90-959 strake $6976 9ks/Midway DENNY JR 72 Alum camel $9396 9ks/Midwav BUZZARD BOMBSHELL 72$5196 FULL LINE OF ELECTRIC SYSTEMS 9 Parts Avail