Free Flight: Indoor

USIC SCHEDULES Most planning attend 1991 USIC/AMA Nationals Johnson City have received returned entry blanks containing event schedule Please advised Ornithopter Federation ROG events have rescheduled interests better model safety FROG rules request CD Tony Italiano some changes have made Federation ROG rules following restriction has added length model front propeller rearmost part must greater 18 inches Note rules official USIC unless adopted other CDs announced advance contest originating group FROG Delaware Valley Federation Model Airplane Clubs has announced original rules shall continue Continued page 112 Fig 3 6 V Rear Wing Past 7 EZ MARWi OZ MARGH X NosetoCG 4 S Fig 1ThU Moment Ann 1 jGhOfdK ICaAC INI sketch shows relationship between model stability parameterscenter gravity CG aerodynamic center AC tail moment arm MA As long aerodynamic center remains aft center gravity plane has positive stability will tend recover forces upset its flight path Fig 2TaIl Moment Arm -iTIAShed XMARQI#41— YZSoom Lenath ________________________________— odel dimensions youll need know want calculate models sta blilty Text shows formula samples Heres use plumb bob find average chord location wings having unusual shapes Make scale outline surface suspend opposite corners Use plumb line mark two lines will intersect center average chord 60 Model Aviation Indoor Bud Tenny Box 545 Richardson TX 75080 Heres start new simpler rubber knot Jim Ciems erk knot takes some frustration out tying up motors tissue strip makes adjustable anchor model partsa quick effective method mounting model components side carrying box lutonen shears tram nicago Cutlery heavy-duty super-sharp extremely dur able come apart cleaning use knife An excellent addition fly ing kit Tenny photo Fig 4 441 graph helps determine mount wings indoor mo del its time mount wing posts assemble model prop rubber motor minus wing determine balance point snd use graph compute best position wings FF Indoor/Tenny Continued page 60 apply list official records maintained members group ATTN HELl PILOTS! INTRODUCING HELl-PADserves MAINTENANCE PAD 20 Square Magnetic Al Surface Prevents Loss Metal Pieces STARTING PAD Keeps Helicopter Dirt & Scratch Free PRACTICE PAD Ideal Reference Tool Practicing Autos Hovering Etc Printed 3 High-Vlsiili Neon Oranges Light Weight Durable Non-Shy Accommodates 30-60 Size $1495 5tH Check MO SOC VISA Oil TX RES ADO 6% SALES TAX Lk,kr ,PAT PFAD MAIL TOIMAGE PRODUCTS PO BOX 566125 DALLAS TEXAS 75356 12141 699-1234 1 PLANS NOW AVAILABLE Easy-to-build WORLD WAR SPAD RED BARON Pedal Planes little pilot age 3 6 will love unique seating toy current top recorded time still held Jim Clem 941 flight made Lakehurst 1990 Labor Day sessions MiniStick postals Tom Vallees MiniStick event continues grow popularity Several Indoor newsletters have published plans models competition has become international scope Model airplane clubs Japan England participating postal challenge Toms club MiniStick rules restrictive event becomes onedesign event expect performance tiny models will soon beyond anyones current expectations Son Gun product Armorall sold protectant plastic parts has used quite successfully rubber lube Indoor models Scale model fliers like because splatters less other rubber lubes similar product Son Gun now reported superior Armorall have tried both Flying opportunities new information available CDs please fill dates after June 1991 beyond Refer January 1991 column list site contact persons safe check contest status phone before leaving home Idaho Kibbie Dome Moscow Andy Modelers AChoice High Quality Modest Price Convenient Size NOT5O KWIK 2t Minute Epesy Lu Tagliafico has set up 3-day contest Kibbie Dome August 8-11 1991 Call write Andy 650-B Taybin Rd NW Salem OR 97304 503/371-0492 details Maryland Goddard NAS record trials flying sessions scheduled auditorium Building 8 Goddard NAS Saturdays 11 am 1030 pm June 22 July 13 July 27 Aug 10 Aug 24 Sep 14 Sep 28 Oct 12 Oct 26 Nov 9 1990 sessions beginning Aug 24 will sanctioned AMA FAI record trials NASA security requires attendees US citizens AMA members license available inspection gate list Continued page 156 WE BUILD YOUR HELl TEST YOUR HELl REPAIR YOUR HELl 6 322 North 7th St 15 vj1 Lehighton Pa 18235 WRITE OR CALL FOR INFORMA TION 112 Model Aviation RV-3 Deluxe Kit Need Only Join Wing Halves Install Tail Feathers Cover Complete Hardware Package Included 85 wingspan G-38 G-62 engine sizes 17-20 lbs weight range information caller wrte PFCRAFr 512 540-4133 PO Box 299 Gonzales Texas 78629 NOTSO KWIK 20 Mm EPOXY lOoz $995 Gas Model Products 8773 Russet Dr Cincinnati OH 45251 deaier cail 513-385-7398 order direct add $260 postage [D.CTEDscec FINISHED LESS FNRqDIO FE G R NEW FBOX VN NUYS L22F & F 23W pTf1.a.emmuneavcmcsn Plans complete full-size patteres material list step-bystep instructions end color photographs Construction ma..,.. ls hardware etc aesilable lumber hardware outJets Some parts available readymade desired List included plens Plane $1495 ea US & Canada Specify plans desired FL Res add 6% tee Add $300 P & H FANTASY TOYS 7958 Pines Blvd Suite 188 Pembrake Pines FL 33024 305432-5198 Habby~Ing3 'II Use CA Adhesives Hinges lull 15 Mils thick 4 mils thicker other leadin brands * Better CA Penetration * Added Strength * Extra Long Life 0 Si BY HINGES P0 BOX 31064-M Billings MT 59107 Dealer Inquiries Iniitedl Wells Cargo Behind. Never Look Back WELLS CARGO Rolling Hanger like makes sense serious RC model pilot has dependable weather-proof transport has convenient safe storage Bird wings spare props radio gear organized ready go Buzzin anytime weatherman says OK Cloud Dancer unit 12 foot ToteWagon model Weve got Wells Cargo just right 6 feet up 3 YR LIMITED WARRANTY PROGRAM FACTORY SERVICE POINTS A TX UTAH US WIDE DEALER SERVICE NETWORK BALL HITCH TRAILERS 6-32 GOOSE NECKS 0 1-800-348-7553 FOR LITERATURE PRICES DEALER & PLANT LOCATIONS SINCEUATU 1954 [1 LIS CARGO PO BOX 729-962ELKHART IN 46515-0729 mostly did looking upwind watching trees grass move New catalog Old Timer Model Supply out better ever Two dollars OTMS PO Box 7334 Van Nuys California 91409 copy Gene Hempel does custom engine work including chrome plating has special Cox 049-05 1 parts 301 North Yale Drive Garland TX 75042 Tel 214/272-5210 Dave Haught has plans rubber CO2 scale models early days aviation likely appeal Old-Timer fan has just sent printer new book Building SAY YOU SAW TIN MODEL AVIATION Kids will have over 20 plans ideas teaching youngsters model building book will $20 pp list plans can yours SASE Haught Graphics Rt 1 Box 978 Munising Michigan 49862 Plans rubber model towline glider kits old 1938-48 Best-by-Test Model Company can purchased designer Edward Schlosser PO Box 412 Ridgefield New Jersey 07657-1418 also has number items hardware interest rubber fliersthrust washers tension springs 14 inch machine-carved balsa propeller etc SASE should get catalog ctric Vacuum Bagging System Foam Core Wings $74 95* Complete Easy Use Add 55 SlVppIOg handlIng Colitorno resldenls odd 0 5% soles lox Dealer Inquiries Invited VISA Mastercard Accepted sheets will show copy old ad general arrangement drawings models Altimeter Stratometer have popular recently SAM small cabin stick events larger 44 span Enduro stick Sensatherm Cabin should become popular also light structurally simple welldesigned duration models FF Indoor/Tenny Continued page 112 compiled Tom Vallee must notify Continued page 160 5501 WCOMO SANTA ANA CALIFORNIA 92703 714 826-6861 GO FLYING WITH COMPLETE ROLLING HANGER LIKE THISI AIR WOLF EPOXY FIBERGLASS FUSELAGE S TAKES MOST 50-60 MECHANICS OTHER MODELS AVAILABLE LARRY JOLLY MODEL PRODUCTS $21000 GATOR TRANSMITFER CASE *Sturdy wood/metal construction Waterproof vinyl covered exterior Convoluted foam liner *Durable hinges latches withstand rough handling eAccomodates single two stick transmitters Protect expensive transmitter.$2495 feather lite GLASS CLOTH 7 oz/sq yd weight close weave makes glass cloth easy filling extremely light finished weight Big 3 sq yd package detailed instructions$895 SOFT-N-SAFE MOUNT type englne soft mount using special serrated Iso-damp grommela Englne always safely retained Vely effective vibration reduction dramatic decrease englne shake Available veiy light machined alum beam mount 60 2/strokes 120 4/strokes Also available alum plate radial mount 60 2/strokes SoftNSafe 120 beam mount complete 5 SoftNSafe 60 beam mount complete 5 tSoft-N-Safe 60 radial mount complete 5 *SoftNSfe replacement Iso-damp grommets Specity soft firm Pkg 4 295 RADIAL ISO-MOUNTS Conventional plate type mount using four Lord/type Iso-mounts Soft 50 duro yellow finn 60 duro purple Iso-mounts available Optimized lowest vibration transmission airframe *60 Radial Iso-mount complete mount 95 Specilr soft 50 duro firm 60 duro Iso-mounts Pk& four 995 5/8 diax 1/2 long 8-32 female end 8-32 x 1/2 male other end Specil soft 50 duro yellow firm 60 duro purple BAT[EKY MANAGEMENT System MOSFET nicad cycler $18995 MOSIET nicad cder designed specifically planes boats helicopters wIth 3 overnight/trickle outputs capable charging 1 9 cells infinitely adjustable FIX overnight charge current ability discharge both FIX TX packs digital discharge timer 3 outputs allow simultaneous separate charging lOt TX AUXILIARY eg glow plug starter battery nicads rilcads will charge overnight rate 17 hours 4 minutes before automatically switching trickle rate Adjustable control allows charging FIX pack up 2000 mAti capacity TX output can discharge 8 9 cell packs 500 mA IIX output can discharge 4 5 cell packs 300 500 mA True Constant Current sources used charge/discharge modes power up fillS Ol1E will always come up overnight charge mode ensuring fully charged batteries event momentary 110 volt power loss Utilizing Current Detection Circuitry LEDs can illuminate wtten current actually flowing out batteries Large digital display anti-glare filter shows FIX TX discharge times Unique CAPACITY CALCULATOR will allow milliamperehour rating batteries determined RK ELECTRONICS 5INOVATIVE ELECTRONICS 504 Fox baa Nuaa New lfiauaplire 03051 882-6022 FF Indoor/Tenny Continued page 156 Tom intention attend advance meet Changes NASA launch schedule other possible events can pre empt auditorium much warning sure verify date Tom before leaving home Tom Vallee 444 Henryton So Laurel MD 20707 301/498-0790 Indoor model stability October 1990 column began discussion stability stability margin sketch shows relationship between center gravity CG aerodynamic center AC tail moment arm MA definition MA distance between 25% chord points wing stabilizer distance between CG AC defined margin stability As long CG front AC model has positive stability model tends recover forces upset Prepaid Orders Money Order Certified CheckShipping & handling $500 COD Orders Cash Certified Check collected delivery Add $550 above amounts DL4LEE IrIQLJIWES IflVITED Prices Specifications Subject Change WIthout Notice Designed manufactured USA flight path CG AC same distance nose model neutrally stable will try recover AC front model will tend increase upset December 1947 Air Trails Hank Cole published article Center Gravity Question gave full explanation aircraft Continued page 162 FOAM CORE FLOATS FOR AIRPLANES AND HELICOPTERS V HULL FLOATS FOR 430 POUND AIRPLANES CHOOSE FROM PLANS KITS OR READY TO PAINT ALSO FLOATS FOR 410 POUND HELICOPTERS AMSOIL SYNTHETIC OIL DEALER SENO SASE FOR FLOAT OR OIL LITERATURE KIRCHER R/C PRODUCTS INC O SHEFFIELD WAY CLARIK N4 07066 MIGHTY LIT PREMIUM GRADE LIGHT PLYWO D Now available insizest NEW 1/46mmthicknessfl 6x12E 12x24U 12x48 Complementing 1/83mm thickness U 6 x 12E 12 x 24E 12 x 48 HOUSE OP BALSAFRANI flANO ENTEPI1ISES 20130 STATE ROADLJL 16300 ESTANA LANE CERRITOS CALIFORNIA 20701 213 0601276WEST PALM lEACH P133414 TEL 407 746O0 160 Model Aviation UHET YOUR ENGINE $395 u Keesfrlrilf neigh Stable rsbber/labnc 96e*iie asSess sImIan between engee aid aseunt mssnl end limwsIl Sheet 2kx4xlw ate Cstswthbladesrsas em mietis hi minsits V&rhs wherever litres selisfied Send ciutenreurey eider len 1556 pta P51115450115 k71~~ ude 5250/Item UPStPL Residents Add 6% Tax GTOR R/C PRODUCTS 3713 Pompano Dr Pensacola P132514 904/476-8639 Serious Horsepower11 05. ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shadel Performance Specialties / Available YS Long & Short Stroke 06 Long Stroke OS 6IFSR 06 40 VRP/VF 0S 91 VRDF STX-40 Rossi 40 coming soon information Call 618J 728-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 Send $1 0Ofor fully illustrated catalog stability years later Charlie Sotich suggested apply Hanks ideas Indoor models article Hank covered factors will discussed Indoor fliers can greatly benefit using simplified application principles Hank discussed Hank summarized design ideas graph allows us determine correction factor CO specific particular model design Charlies suggestion developed graphic approach locating Indoor model wings best performance almost Indoor model design possible locate wing sockets correctly before first ever flown critical factors wing stabilizer aspect ratios AC Cf tail moment arm I VALUABLE COUPON 7 Flying paper CORSAIR $400 2for $6 lOfor $12 Etuild ny IS Just 2 Hour pails Pre-cut & Painted W W Ii olor nch Wingspan ch Prop]flcliIlrh Wah MotorPOWER KIT II catalog 3000 planca $18 $23 Foreign Refundable what order over $25 • RC paper airp1ars PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA Send wia deLoL pit p&w Definitions following terms symbols will used rest discussion Average chord squared divided area Aspect ratio ected span divided average chord CG nce point complete model motor LE ing edge R aspect ratio Rt aspect ratio TE ling edge Hank Coles graph computed using formula Cf * Rt * R * Rt ank used formula compute aerodynamic center AC area * MA * Ce/wing area Figure 2 shows factors required compute AC model has already assembled Assume Easy B model 3 x 18 rectangular wing 2 x 12 rectangular stab 11 motor stick 11 tail boom wing leading edge 4 nose model balances 6 front end figures can compute following values Figure 2 X 7 Z 18/3 6 Rt 12/2 6 wing area qin stab area qin Cf * 6 * 6 * 6 0519 Compute ACFrom wing TE 075 x 3 225 25% wing chord point MA Z 4 1575 in 11 boom length75 * 2 AC 1575 * 05 1954 in behind 25% wing chord Since CG FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWEF 4 OH PLY FOAM AND BALSA WOOD KIT $6995 225 behind wing 25% point AC 363 behind 25% wing chord margin 363225 138 Expressed % wing chord margin 138/3 x 100% 46% After several years checking winning models Ive learned margin 5% 015 3 chord about optimum Indoor models graphic solution assumes initial stability margin 0% CG AC both X nose Remember TE 225 behind quarter chord point example model Compute AC two wing locations such 2 6 nose two wing locations Z 5 Z 9 respectively AC two Conunued page 166 Rubber ft Engine Pawer Free Flight Diepley Control Line Electric Power RIC Airpienee new illustrated 32 page tabloid size cetalog US ft Cenade *100 Foraigh $300 Penn Velley Hobby Center 837-A W Main Sr Lenadela PA 1944S 215- 3U4770 Antiques Military Civilian Heiicopter Sailplanca 3Oaa pbS10000 3-mw aawngs color FOTOPAAICShwiuing KOKU-FAN 162 Model Aviation 10 SPAN 30-3, LOO ou-o .u POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKrn$1995 SEND $100 FOR CATALOGCART 1 NEODESHA KS 66757 OF SAC KITS AND ACChtfh316 325-2821 FREE SHIPPING ON KIT ORDERS~ianaconwonvVISAASTERCARD 10 SPAN 19- LOO o-42 CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 APC PROPELLERS Sound Supression Design High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals World Championships Sports Sizes 57x3 7x3 7x4 7x57x67x7 7x8 7x8 7x10$159 EACH 8x4 8x5 8x6 8x7 8x8 8x9 8x10$179 EACH 9x4 9x5 9x68x7 RxB 9x99x10$19BEACH 95x45 10x4* 10x5* 10x6 10x7 10x6 10x9 lOxlO.S229EACH 11 x6 11 x7 11 x8 11 x9 $249 EACH 12x6 12x7 12x8.$2B9EACH Reverse Pitch Pusher 2 x 6 lOx 6* lOx 7* lOx 8* 11x6*11x7*$395EACH Competition 78x4 78x6 78x7 9x65 9x75 9x85$395EACH lix 10 lix 11 lix 12 lix 12W 11x13 11x14 12x9 12x9W 12x10 l2xlcMJ 12x1112xllN 12x12 l2x12N12x13 12xl3N 12x14 125x9125x10 125x11 125x12 13x8 13x10 $795 EACH 135x9* 135x125 135x14 14x614x8 14x10 14x12 14x13* 14x14 144x105 144x12 144x13*15x8 15x1015x12 16x8 16x 10 16x 12 . $1295 EACH New sizes Contact local hobby dealer first doesnt hove whet need order direct 916-661-6515 Manafach,d Landing Poducts PO Eoa 930 KnIghts Landing CA 95045 2 conditions 317 respectively Case 1 AC 1775 * 05 1954 behind 25% wing chord Z 5 AC location S in225 684 nose Case 2 AC 1375 * 05 1954 behind 25% wing chord Z 2inY 9intheACis9in -225 992 nose Figure 3 shows computed data plotted graph dotted line labeled 0% Margin As noted above 0% margin unacceptable heavy line marked 5% Margin added graph time mount wing posts assemble model prop rubber motor minus wing Determine balance point example assume balance point 68 nose Draw vertical line 68 graph 5% margin line horizontal line intersection left edge graph line intersects ordinate 522 showing rear post should 522 nose However result places wing ahead balance point assembled model wont balance first test would indicate correct oversight attach weight equal wing weight one-half chord ahead 522 point new balance graphic solution PRODUCTS FOR ThE DOSCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes Headers uri Mufflers Expansion Mufflers * Helicopter Ball Mufflers ialized Exhaust Systems Unsurpaasd Ward test should give good location rear post Note second balance test should made computed wing position centered over balance point stability margin example above simplified having constant-chord wing stab Finding required average chord easy wing stab outline symmetrical surfaces sweepback non-symmetrical taper much difficult analyze Perhaps easiest method finding average chord oddly shaped surface make scale outline surface suspend opposite corners shown Figure 4 sure outline free pivot easily centroid outline will directly below pivot point plumb line can used ADVANCED AERO PRODUCTS YS & OS SLEXPASS 20 EXHMST NYSTEDSEAU ER WRITE PER RfN4RTER MrTIRII AIftcNAFl ANNE ULENAIN IWO AEVANCEO AERO PJCTO fRI NOR 26-C MARt TX TRERO 014 924-3946 WORLDS BOCEEST SCALE PLANS & DOCOXONTATION SERVICE 70005 IjAft Pkt,, SAP&07 SCALE ISOEL PLATO RAAAA I..FIt*A SA SAi 100 PAGE CATALOG IS*AAC So NS ENLAROINOOXON Mdlsofl An. XTeSsRoo NE 2740X SCALE OEEAueNEATIRNXSN292-625 ss un Frice two magazines can own conxehensive downent $ut RC Soarig kxkistry has offer NSP Soarkig Refererice Catalog rpesents two years research effat Peoie toi us Uat 1990 catalog tie best iwesbient ever made sport Wel 1991 catalog ger betteil order yaw NSP RC Soarig RefererEe mid Catalog send check money order $&00 NSP 100 pages product information Articles Reviews specs Fully fllustrated est catalog RC Soaring complete re-do 1990s catalog must4iave reference lNortflLaSt aupIane rrouucr5 16 Kkby Lane Wllston Vemiont 05495 O2 658-9482 166 Model Aviation U N ** 4620 CRANDALL-LVILLE R DON INDIANA 47112 e se e ion o emo e ro 0 e irp anes e pro essiona lMILISTED BELOWIn Business since 1973 PRICES SUBJECT TO CHANGE WITHOUT NOTICE IS JUST FEW OF THE MFG WE STOCK HOURS MONDAY THRU THURSDAY9AM 5PM FRIDAY9AM-2PM CLOSED SATURDAY& SUN AY PHONE 812 366-3141 A-JUSTO JIGPOX AMBROIDFUTABA FFORD KITS AVAILABLE SHORTLY ARCO RUBBERBANDSGOLDBERG 4 TWIN COMANCHE COMANCHE & MORE BRIDIGAS MODEL PROD DAVEYS SYSTEMSHALLCO COVERITEHOBBYPOXY DEVCONHOT STUFF DREMELK&BMFG DU-BROSIG DYNAFILITESAITO SONIC-TRONICS STERLING SULLIVAN TOP PLITEMSCEI1995 EAA AKU SPORT VS ENGINES$1 LAN ER121 MILLERStafford 0AE FOB PAOEOO NORTHEASThr~EDBA AS ONON ZINGER PROPSBOX OF OPdOOEO 0 . -0r~ complete listing etcplease senda stamped lope DEALERS j self-address enve WANTED 0 STAFFORD AIRCOUPE $9995 KITS Glue NStgckum j Buildum & FIyum need help call us ~gjt boxI AFTER HOURS CALL WE MIGHT BE HERE fuse geI THANKS FOR YOUR BUSINESS BILL & JOYCE mark two lines will intersect center average chord chord location must used compute wing location method model balance may seem complicated have used since 1972 great success time has ever failed failed second balance test correct wing weight erk knot world Indoor flying seems thrive rubber knotseveryone has favorite method tying up motors problem knots delicate elaborate knot adds unnecessary weight tying process scuffs rubber knot may fail knot doesnt hold lose motor may too short after tied again may lose flight whole model simplest knot Ive tried shown Jim Clem gave unlikely name erk knot photo shows starta simple overhand knot both strands Moisten knot snug up almost tight possible Next coat outside edge knot lightly super-thick grade cyanoacrylate glue quickly pull knot tighter Jim claims listen closely pull will hear erk sound Examine motor strands exit inner side knot glue showing used too much finish knot trim ends about glue together have used knot both tan Pirelli excellent results has two advantagesit potentially lightest knot definitely uses less rubber other knot know Super shears photo shows excellent toolkitchen shears Chicago Cutlery heavy-duty shears super-sharp extremely durable also come apart cleaning can used knife Dallas available Dillards Heres quick effective method mounting model components inside carrying box plug-in Pennyplane stab see photo has secured strip tissue holds against block tissue glued down end other end uses pressure-sensitive label label will release easily re-usable can quickly replaced necessaryD F-i 5/Conover Continued page 59 start launching thumb forefinger left hand grip subrudder very back fuselage Point nose up 45 degrees bank slightly left Start half-power launches As increase power youll notice interesting change lift characteristics delta wing Both swept-back delta wings have critical flow change reach higher speeds center pressure shifts airplane noses down Overcome dip trajectory elevating nose course could always execute Heinie Dittmar Continued page 172 KSB FUEL SHUTOFF TIMERS Again now available CIT lFF llcrrII ~J $1750 Shipping $250 up toE Units Over 6add35each Exclusive Importer Jet mm Lightest PILOT BUST hasr Modern Jet Helmet Face Mask Oxygen ... ai~l RecognizedC5A Certified E26226File NoPesnen Pile No.aJ LR2O1 54 Onip certified checks o money orders accepted Minimum orde $1400 three packages 4 Powerpoles 15400 per peckage $200 chipping end handlingi CT residents edd sales tao Prices sahject change notice DEALER IRQUIRIE5 INVITED further information end dealer prices send SASh end Business Card SERMOS R/C SNAP CONNECTORS Inc Cedar Corners Station Box 16787 Stamford CT 06905 12031322-6294 July 1991 167 F Model Supply u~L PO Box 3957344 C E CARSON TORRANCE CA 90510CARSON CA 90740 TEL 12131 830-9939

USIC SCHEDULES Most planning attend 1991 USIC/AMA Nationals Johnson City have received returned entry blanks containing event schedule Please advised Ornithopter Federation ROG events have rescheduled interests better model safety FROG rules request CD Tony Italiano some changes have made Federation ROG rules following restriction has added length model front propeller rearmost part must greater 18 inches Note rules official USIC unless adopted other CDs announced advance contest originating group FROG Delaware Valley Federation Model Airplane Clubs has announced original rules shall continue Continued page 112 Fig 3 6 V Rear Wing Past 7 EZ MARWi OZ MARGH X NosetoCG 4 S Fig 1ThU Moment Ann 1 jGhOfdK ICaAC INI sketch shows relationship between model stability parameterscenter gravity CG aerodynamic center AC tail moment arm MA As long aerodynamic center remains aft center gravity plane has positive stability will tend recover forces upset its flight path Fig 2TaIl Moment Arm -iTIAShed XMARQI#41— YZSoom Lenath ________________________________— odel dimensions youll need know want calculate models sta blilty Text shows formula samples Heres use plumb bob find average chord location wings having unusual shapes Make scale outline surface suspend opposite corners Use plumb line mark two lines will intersect center average chord 60 Model Aviation Indoor Bud Tenny Box 545 Richardson TX 75080 Heres start new simpler rubber knot Jim Ciems erk knot takes some frustration out tying up motors tissue strip makes adjustable anchor model partsa quick effective method mounting model components side carrying box lutonen shears tram nicago Cutlery heavy-duty super-sharp extremely dur able come apart cleaning use knife An excellent addition fly ing kit Tenny photo Fig 4 441 graph helps determine mount wings indoor mo del its time mount wing posts assemble model prop rubber motor minus wing determine balance point snd use graph compute best position wings FF Indoor/Tenny Continued page 60 apply list official records maintained members group ATTN HELl PILOTS! INTRODUCING HELl-PADserves MAINTENANCE PAD 20 Square Magnetic Al Surface Prevents Loss Metal Pieces STARTING PAD Keeps Helicopter Dirt & Scratch Free PRACTICE PAD Ideal Reference Tool Practicing Autos Hovering Etc Printed 3 High-Vlsiili Neon Oranges Light Weight Durable Non-Shy Accommodates 30-60 Size $1495 5tH Check MO SOC VISA Oil TX RES ADO 6% SALES TAX Lk,kr ,PAT PFAD MAIL TOIMAGE PRODUCTS PO BOX 566125 DALLAS TEXAS 75356 12141 699-1234 1 PLANS NOW AVAILABLE Easy-to-build WORLD WAR SPAD RED BARON Pedal Planes little pilot age 3 6 will love unique seating toy current top recorded time still held Jim Clem 941 flight made Lakehurst 1990 Labor Day sessions MiniStick postals Tom Vallees MiniStick event continues grow popularity Several Indoor newsletters have published plans models competition has become international scope Model airplane clubs Japan England participating postal challenge Toms club MiniStick rules restrictive event becomes onedesign event expect performance tiny models will soon beyond anyones current expectations Son Gun product Armorall sold protectant plastic parts has used quite successfully rubber lube Indoor models Scale model fliers like because splatters less other rubber lubes similar product Son Gun now reported superior Armorall have tried both Flying opportunities new information available CDs please fill dates after June 1991 beyond Refer January 1991 column list site contact persons safe check contest status phone before leaving home Idaho Kibbie Dome Moscow Andy Modelers AChoice High Quality Modest Price Convenient Size NOT5O KWIK 2t Minute Epesy Lu Tagliafico has set up 3-day contest Kibbie Dome August 8-11 1991 Call write Andy 650-B Taybin Rd NW Salem OR 97304 503/371-0492 details Maryland Goddard NAS record trials flying sessions scheduled auditorium Building 8 Goddard NAS Saturdays 11 am 1030 pm June 22 July 13 July 27 Aug 10 Aug 24 Sep 14 Sep 28 Oct 12 Oct 26 Nov 9 1990 sessions beginning Aug 24 will sanctioned AMA FAI record trials NASA security requires attendees US citizens AMA members license available inspection gate list Continued page 156 WE BUILD YOUR HELl TEST YOUR HELl REPAIR YOUR HELl 6 322 North 7th St 15 vj1 Lehighton Pa 18235 WRITE OR CALL FOR INFORMA TION 112 Model Aviation RV-3 Deluxe Kit Need Only Join Wing Halves Install Tail Feathers Cover Complete Hardware Package Included 85 wingspan G-38 G-62 engine sizes 17-20 lbs weight range information caller wrte PFCRAFr 512 540-4133 PO Box 299 Gonzales Texas 78629 NOTSO KWIK 20 Mm EPOXY lOoz $995 Gas Model Products 8773 Russet Dr Cincinnati OH 45251 deaier cail 513-385-7398 order direct add $260 postage [D.CTEDscec FINISHED LESS FNRqDIO FE G R NEW FBOX VN NUYS L22F & F 23W pTf1.a.emmuneavcmcsn Plans complete full-size patteres material list step-bystep instructions end color photographs Construction ma..,.. ls hardware etc aesilable lumber hardware outJets Some parts available readymade desired List included plens Plane $1495 ea US & Canada Specify plans desired FL Res add 6% tee Add $300 P & H FANTASY TOYS 7958 Pines Blvd Suite 188 Pembrake Pines FL 33024 305432-5198 Habby~Ing3 'II Use CA Adhesives Hinges lull 15 Mils thick 4 mils thicker other leadin brands * Better CA Penetration * Added Strength * Extra Long Life 0 Si BY HINGES P0 BOX 31064-M Billings MT 59107 Dealer Inquiries Iniitedl Wells Cargo Behind. Never Look Back WELLS CARGO Rolling Hanger like makes sense serious RC model pilot has dependable weather-proof transport has convenient safe storage Bird wings spare props radio gear organized ready go Buzzin anytime weatherman says OK Cloud Dancer unit 12 foot ToteWagon model Weve got Wells Cargo just right 6 feet up 3 YR LIMITED WARRANTY PROGRAM FACTORY SERVICE POINTS A TX UTAH US WIDE DEALER SERVICE NETWORK BALL HITCH TRAILERS 6-32 GOOSE NECKS 0 1-800-348-7553 FOR LITERATURE PRICES DEALER & PLANT LOCATIONS SINCEUATU 1954 [1 LIS CARGO PO BOX 729-962ELKHART IN 46515-0729 mostly did looking upwind watching trees grass move New catalog Old Timer Model Supply out better ever Two dollars OTMS PO Box 7334 Van Nuys California 91409 copy Gene Hempel does custom engine work including chrome plating has special Cox 049-05 1 parts 301 North Yale Drive Garland TX 75042 Tel 214/272-5210 Dave Haught has plans rubber CO2 scale models early days aviation likely appeal Old-Timer fan has just sent printer new book Building SAY YOU SAW TIN MODEL AVIATION Kids will have over 20 plans ideas teaching youngsters model building book will $20 pp list plans can yours SASE Haught Graphics Rt 1 Box 978 Munising Michigan 49862 Plans rubber model towline glider kits old 1938-48 Best-by-Test Model Company can purchased designer Edward Schlosser PO Box 412 Ridgefield New Jersey 07657-1418 also has number items hardware interest rubber fliersthrust washers tension springs 14 inch machine-carved balsa propeller etc SASE should get catalog ctric Vacuum Bagging System Foam Core Wings $74 95* Complete Easy Use Add 55 SlVppIOg handlIng Colitorno resldenls odd 0 5% soles lox Dealer Inquiries Invited VISA Mastercard Accepted sheets will show copy old ad general arrangement drawings models Altimeter Stratometer have popular recently SAM small cabin stick events larger 44 span Enduro stick Sensatherm Cabin should become popular also light structurally simple welldesigned duration models FF Indoor/Tenny Continued page 112 compiled Tom Vallee must notify Continued page 160 5501 WCOMO SANTA ANA CALIFORNIA 92703 714 826-6861 GO FLYING WITH COMPLETE ROLLING HANGER LIKE THISI AIR WOLF EPOXY FIBERGLASS FUSELAGE S TAKES MOST 50-60 MECHANICS OTHER MODELS AVAILABLE LARRY JOLLY MODEL PRODUCTS $21000 GATOR TRANSMITFER CASE *Sturdy wood/metal construction Waterproof vinyl covered exterior Convoluted foam liner *Durable hinges latches withstand rough handling eAccomodates single two stick transmitters Protect expensive transmitter.$2495 feather lite GLASS CLOTH 7 oz/sq yd weight close weave makes glass cloth easy filling extremely light finished weight Big 3 sq yd package detailed instructions$895 SOFT-N-SAFE MOUNT type englne soft mount using special serrated Iso-damp grommela Englne always safely retained Vely effective vibration reduction dramatic decrease englne shake Available veiy light machined alum beam mount 60 2/strokes 120 4/strokes Also available alum plate radial mount 60 2/strokes SoftNSafe 120 beam mount complete 5 SoftNSafe 60 beam mount complete 5 tSoft-N-Safe 60 radial mount complete 5 *SoftNSfe replacement Iso-damp grommets Specity soft firm Pkg 4 295 RADIAL ISO-MOUNTS Conventional plate type mount using four Lord/type Iso-mounts Soft 50 duro yellow finn 60 duro purple Iso-mounts available Optimized lowest vibration transmission airframe *60 Radial Iso-mount complete mount 95 Specilr soft 50 duro firm 60 duro Iso-mounts Pk& four 995 5/8 diax 1/2 long 8-32 female end 8-32 x 1/2 male other end Specil soft 50 duro yellow firm 60 duro purple BAT[EKY MANAGEMENT System MOSFET nicad cycler $18995 MOSIET nicad cder designed specifically planes boats helicopters wIth 3 overnight/trickle outputs capable charging 1 9 cells infinitely adjustable FIX overnight charge current ability discharge both FIX TX packs digital discharge timer 3 outputs allow simultaneous separate charging lOt TX AUXILIARY eg glow plug starter battery nicads rilcads will charge overnight rate 17 hours 4 minutes before automatically switching trickle rate Adjustable control allows charging FIX pack up 2000 mAti capacity TX output can discharge 8 9 cell packs 500 mA IIX output can discharge 4 5 cell packs 300 500 mA True Constant Current sources used charge/discharge modes power up fillS Ol1E will always come up overnight charge mode ensuring fully charged batteries event momentary 110 volt power loss Utilizing Current Detection Circuitry LEDs can illuminate wtten current actually flowing out batteries Large digital display anti-glare filter shows FIX TX discharge times Unique CAPACITY CALCULATOR will allow milliamperehour rating batteries determined RK ELECTRONICS 5INOVATIVE ELECTRONICS 504 Fox baa Nuaa New lfiauaplire 03051 882-6022 FF Indoor/Tenny Continued page 156 Tom intention attend advance meet Changes NASA launch schedule other possible events can pre empt auditorium much warning sure verify date Tom before leaving home Tom Vallee 444 Henryton So Laurel MD 20707 301/498-0790 Indoor model stability October 1990 column began discussion stability stability margin sketch shows relationship between center gravity CG aerodynamic center AC tail moment arm MA definition MA distance between 25% chord points wing stabilizer distance between CG AC defined margin stability As long CG front AC model has positive stability model tends recover forces upset Prepaid Orders Money Order Certified CheckShipping & handling $500 COD Orders Cash Certified Check collected delivery Add $550 above amounts DL4LEE IrIQLJIWES IflVITED Prices Specifications Subject Change WIthout Notice Designed manufactured USA flight path CG AC same distance nose model neutrally stable will try recover AC front model will tend increase upset December 1947 Air Trails Hank Cole published article Center Gravity Question gave full explanation aircraft Continued page 162 FOAM CORE FLOATS FOR AIRPLANES AND HELICOPTERS V HULL FLOATS FOR 430 POUND AIRPLANES CHOOSE FROM PLANS KITS OR READY TO PAINT ALSO FLOATS FOR 410 POUND HELICOPTERS AMSOIL SYNTHETIC OIL DEALER SENO SASE FOR FLOAT OR OIL LITERATURE KIRCHER R/C PRODUCTS INC O SHEFFIELD WAY CLARIK N4 07066 MIGHTY LIT PREMIUM GRADE LIGHT PLYWO D Now available insizest NEW 1/46mmthicknessfl 6x12E 12x24U 12x48 Complementing 1/83mm thickness U 6 x 12E 12 x 24E 12 x 48 HOUSE OP BALSAFRANI flANO ENTEPI1ISES 20130 STATE ROADLJL 16300 ESTANA LANE CERRITOS CALIFORNIA 20701 213 0601276WEST PALM lEACH P133414 TEL 407 746O0 160 Model Aviation UHET YOUR ENGINE $395 u Keesfrlrilf neigh Stable rsbber/labnc 96e*iie asSess sImIan between engee aid aseunt mssnl end limwsIl Sheet 2kx4xlw ate Cstswthbladesrsas em mietis hi minsits V&rhs wherever litres selisfied Send ciutenreurey eider len 1556 pta P51115450115 k71~~ ude 5250/Item UPStPL Residents Add 6% Tax GTOR R/C PRODUCTS 3713 Pompano Dr Pensacola P132514 904/476-8639 Serious Horsepower11 05. ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shadel Performance Specialties / Available YS Long & Short Stroke 06 Long Stroke OS 6IFSR 06 40 VRP/VF 0S 91 VRDF STX-40 Rossi 40 coming soon information Call 618J 728-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 Send $1 0Ofor fully illustrated catalog stability years later Charlie Sotich suggested apply Hanks ideas Indoor models article Hank covered factors will discussed Indoor fliers can greatly benefit using simplified application principles Hank discussed Hank summarized design ideas graph allows us determine correction factor CO specific particular model design Charlies suggestion developed graphic approach locating Indoor model wings best performance almost Indoor model design possible locate wing sockets correctly before first ever flown critical factors wing stabilizer aspect ratios AC Cf tail moment arm I VALUABLE COUPON 7 Flying paper CORSAIR $400 2for $6 lOfor $12 Etuild ny IS Just 2 Hour pails Pre-cut & Painted W W Ii olor nch Wingspan ch Prop]flcliIlrh Wah MotorPOWER KIT II catalog 3000 planca $18 $23 Foreign Refundable what order over $25 • RC paper airp1ars PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA Send wia deLoL pit p&w Definitions following terms symbols will used rest discussion Average chord squared divided area Aspect ratio ected span divided average chord CG nce point complete model motor LE ing edge R aspect ratio Rt aspect ratio TE ling edge Hank Coles graph computed using formula Cf * Rt * R * Rt ank used formula compute aerodynamic center AC area * MA * Ce/wing area Figure 2 shows factors required compute AC model has already assembled Assume Easy B model 3 x 18 rectangular wing 2 x 12 rectangular stab 11 motor stick 11 tail boom wing leading edge 4 nose model balances 6 front end figures can compute following values Figure 2 X 7 Z 18/3 6 Rt 12/2 6 wing area qin stab area qin Cf * 6 * 6 * 6 0519 Compute ACFrom wing TE 075 x 3 225 25% wing chord point MA Z 4 1575 in 11 boom length75 * 2 AC 1575 * 05 1954 in behind 25% wing chord Since CG FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWEF 4 OH PLY FOAM AND BALSA WOOD KIT $6995 225 behind wing 25% point AC 363 behind 25% wing chord margin 363225 138 Expressed % wing chord margin 138/3 x 100% 46% After several years checking winning models Ive learned margin 5% 015 3 chord about optimum Indoor models graphic solution assumes initial stability margin 0% CG AC both X nose Remember TE 225 behind quarter chord point example model Compute AC two wing locations such 2 6 nose two wing locations Z 5 Z 9 respectively AC two Conunued page 166 Rubber ft Engine Pawer Free Flight Diepley Control Line Electric Power RIC Airpienee new illustrated 32 page tabloid size cetalog US ft Cenade *100 Foraigh $300 Penn Velley Hobby Center 837-A W Main Sr Lenadela PA 1944S 215- 3U4770 Antiques Military Civilian Heiicopter Sailplanca 3Oaa pbS10000 3-mw aawngs color FOTOPAAICShwiuing KOKU-FAN 162 Model Aviation 10 SPAN 30-3, LOO ou-o .u POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKrn$1995 SEND $100 FOR CATALOGCART 1 NEODESHA KS 66757 OF SAC KITS AND ACChtfh316 325-2821 FREE SHIPPING ON KIT ORDERS~ianaconwonvVISAASTERCARD 10 SPAN 19- LOO o-42 CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 APC PROPELLERS Sound Supression Design High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals World Championships Sports Sizes 57x3 7x3 7x4 7x57x67x7 7x8 7x8 7x10$159 EACH 8x4 8x5 8x6 8x7 8x8 8x9 8x10$179 EACH 9x4 9x5 9x68x7 RxB 9x99x10$19BEACH 95x45 10x4* 10x5* 10x6 10x7 10x6 10x9 lOxlO.S229EACH 11 x6 11 x7 11 x8 11 x9 $249 EACH 12x6 12x7 12x8.$2B9EACH Reverse Pitch Pusher 2 x 6 lOx 6* lOx 7* lOx 8* 11x6*11x7*$395EACH Competition 78x4 78x6 78x7 9x65 9x75 9x85$395EACH lix 10 lix 11 lix 12 lix 12W 11x13 11x14 12x9 12x9W 12x10 l2xlcMJ 12x1112xllN 12x12 l2x12N12x13 12xl3N 12x14 125x9125x10 125x11 125x12 13x8 13x10 $795 EACH 135x9* 135x125 135x14 14x614x8 14x10 14x12 14x13* 14x14 144x105 144x12 144x13*15x8 15x1015x12 16x8 16x 10 16x 12 . $1295 EACH New sizes Contact local hobby dealer first doesnt hove whet need order direct 916-661-6515 Manafach,d Landing Poducts PO Eoa 930 KnIghts Landing CA 95045 2 conditions 317 respectively Case 1 AC 1775 * 05 1954 behind 25% wing chord Z 5 AC location S in225 684 nose Case 2 AC 1375 * 05 1954 behind 25% wing chord Z 2inY 9intheACis9in -225 992 nose Figure 3 shows computed data plotted graph dotted line labeled 0% Margin As noted above 0% margin unacceptable heavy line marked 5% Margin added graph time mount wing posts assemble model prop rubber motor minus wing Determine balance point example assume balance point 68 nose Draw vertical line 68 graph 5% margin line horizontal line intersection left edge graph line intersects ordinate 522 showing rear post should 522 nose However result places wing ahead balance point assembled model wont balance first test would indicate correct oversight attach weight equal wing weight one-half chord ahead 522 point new balance graphic solution PRODUCTS FOR ThE DOSCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes Headers uri Mufflers Expansion Mufflers * Helicopter Ball Mufflers ialized Exhaust Systems Unsurpaasd Ward test should give good location rear post Note second balance test should made computed wing position centered over balance point stability margin example above simplified having constant-chord wing stab Finding required average chord easy wing stab outline symmetrical surfaces sweepback non-symmetrical taper much difficult analyze Perhaps easiest method finding average chord oddly shaped surface make scale outline surface suspend opposite corners shown Figure 4 sure outline free pivot easily centroid outline will directly below pivot point plumb line can used ADVANCED AERO PRODUCTS YS & OS SLEXPASS 20 EXHMST NYSTEDSEAU ER WRITE PER RfN4RTER MrTIRII AIftcNAFl ANNE ULENAIN IWO AEVANCEO AERO PJCTO fRI NOR 26-C MARt TX TRERO 014 924-3946 WORLDS BOCEEST SCALE PLANS & DOCOXONTATION SERVICE 70005 IjAft Pkt,, SAP&07 SCALE ISOEL PLATO RAAAA I..FIt*A SA SAi 100 PAGE CATALOG IS*AAC So NS ENLAROINOOXON Mdlsofl An. XTeSsRoo NE 2740X SCALE OEEAueNEATIRNXSN292-625 ss un Frice two magazines can own conxehensive downent $ut RC Soarig kxkistry has offer NSP Soarkig Refererice Catalog rpesents two years research effat Peoie toi us Uat 1990 catalog tie best iwesbient ever made sport Wel 1991 catalog ger betteil order yaw NSP RC Soarig RefererEe mid Catalog send check money order $&00 NSP 100 pages product information Articles Reviews specs Fully fllustrated est catalog RC Soaring complete re-do 1990s catalog must4iave reference lNortflLaSt aupIane rrouucr5 16 Kkby Lane Wllston Vemiont 05495 O2 658-9482 166 Model Aviation U N ** 4620 CRANDALL-LVILLE R DON INDIANA 47112 e se e ion o emo e ro 0 e irp anes e pro essiona lMILISTED BELOWIn Business since 1973 PRICES SUBJECT TO CHANGE WITHOUT NOTICE IS JUST FEW OF THE MFG WE STOCK HOURS MONDAY THRU THURSDAY9AM 5PM FRIDAY9AM-2PM CLOSED SATURDAY& SUN AY PHONE 812 366-3141 A-JUSTO JIGPOX AMBROIDFUTABA FFORD KITS AVAILABLE SHORTLY ARCO RUBBERBANDSGOLDBERG 4 TWIN COMANCHE COMANCHE & MORE BRIDIGAS MODEL PROD DAVEYS SYSTEMSHALLCO COVERITEHOBBYPOXY DEVCONHOT STUFF DREMELK&BMFG DU-BROSIG DYNAFILITESAITO SONIC-TRONICS STERLING SULLIVAN TOP PLITEMSCEI1995 EAA AKU SPORT VS ENGINES$1 LAN ER121 MILLERStafford 0AE FOB PAOEOO NORTHEASThr~EDBA AS ONON ZINGER PROPSBOX OF OPdOOEO 0 . -0r~ complete listing etcplease senda stamped lope DEALERS j self-address enve WANTED 0 STAFFORD AIRCOUPE $9995 KITS Glue NStgckum j Buildum & FIyum need help call us ~gjt boxI AFTER HOURS CALL WE MIGHT BE HERE fuse geI THANKS FOR YOUR BUSINESS BILL & JOYCE mark two lines will intersect center average chord chord location must used compute wing location method model balance may seem complicated have used since 1972 great success time has ever failed failed second balance test correct wing weight erk knot world Indoor flying seems thrive rubber knotseveryone has favorite method tying up motors problem knots delicate elaborate knot adds unnecessary weight tying process scuffs rubber knot may fail knot doesnt hold lose motor may too short after tied again may lose flight whole model simplest knot Ive tried shown Jim Clem gave unlikely name erk knot photo shows starta simple overhand knot both strands Moisten knot snug up almost tight possible Next coat outside edge knot lightly super-thick grade cyanoacrylate glue quickly pull knot tighter Jim claims listen closely pull will hear erk sound Examine motor strands exit inner side knot glue showing used too much finish knot trim ends about glue together have used knot both tan Pirelli excellent results has two advantagesit potentially lightest knot definitely uses less rubber other knot know Super shears photo shows excellent toolkitchen shears Chicago Cutlery heavy-duty shears super-sharp extremely durable also come apart cleaning can used knife Dallas available Dillards Heres quick effective method mounting model components inside carrying box plug-in Pennyplane stab see photo has secured strip tissue holds against block tissue glued down end other end uses pressure-sensitive label label will release easily re-usable can quickly replaced necessaryD F-i 5/Conover Continued page 59 start launching thumb forefinger left hand grip subrudder very back fuselage Point nose up 45 degrees bank slightly left Start half-power launches As increase power youll notice interesting change lift characteristics delta wing Both swept-back delta wings have critical flow change reach higher speeds center pressure shifts airplane noses down Overcome dip trajectory elevating nose course could always execute Heinie Dittmar Continued page 172 KSB FUEL SHUTOFF TIMERS Again now available CIT lFF llcrrII ~J $1750 Shipping $250 up toE Units Over 6add35each Exclusive Importer Jet mm Lightest PILOT BUST hasr Modern Jet Helmet Face Mask Oxygen ... ai~l RecognizedC5A Certified E26226File NoPesnen Pile No.aJ LR2O1 54 Onip certified checks o money orders accepted Minimum orde $1400 three packages 4 Powerpoles 15400 per peckage $200 chipping end handlingi CT residents edd sales tao Prices sahject change notice DEALER IRQUIRIE5 INVITED further information end dealer prices send SASh end Business Card SERMOS R/C SNAP CONNECTORS Inc Cedar Corners Station Box 16787 Stamford CT 06905 12031322-6294 July 1991 167 F Model Supply u~L PO Box 3957344 C E CARSON TORRANCE CA 90510CARSON CA 90740 TEL 12131 830-9939

USIC SCHEDULES Most planning attend 1991 USIC/AMA Nationals Johnson City have received returned entry blanks containing event schedule Please advised Ornithopter Federation ROG events have rescheduled interests better model safety FROG rules request CD Tony Italiano some changes have made Federation ROG rules following restriction has added length model front propeller rearmost part must greater 18 inches Note rules official USIC unless adopted other CDs announced advance contest originating group FROG Delaware Valley Federation Model Airplane Clubs has announced original rules shall continue Continued page 112 Fig 3 6 V Rear Wing Past 7 EZ MARWi OZ MARGH X NosetoCG 4 S Fig 1ThU Moment Ann 1 jGhOfdK ICaAC INI sketch shows relationship between model stability parameterscenter gravity CG aerodynamic center AC tail moment arm MA As long aerodynamic center remains aft center gravity plane has positive stability will tend recover forces upset its flight path Fig 2TaIl Moment Arm -iTIAShed XMARQI#41— YZSoom Lenath ________________________________— odel dimensions youll need know want calculate models sta blilty Text shows formula samples Heres use plumb bob find average chord location wings having unusual shapes Make scale outline surface suspend opposite corners Use plumb line mark two lines will intersect center average chord 60 Model Aviation Indoor Bud Tenny Box 545 Richardson TX 75080 Heres start new simpler rubber knot Jim Ciems erk knot takes some frustration out tying up motors tissue strip makes adjustable anchor model partsa quick effective method mounting model components side carrying box lutonen shears tram nicago Cutlery heavy-duty super-sharp extremely dur able come apart cleaning use knife An excellent addition fly ing kit Tenny photo Fig 4 441 graph helps determine mount wings indoor mo del its time mount wing posts assemble model prop rubber motor minus wing determine balance point snd use graph compute best position wings FF Indoor/Tenny Continued page 60 apply list official records maintained members group ATTN HELl PILOTS! INTRODUCING HELl-PADserves MAINTENANCE PAD 20 Square Magnetic Al Surface Prevents Loss Metal Pieces STARTING PAD Keeps Helicopter Dirt & Scratch Free PRACTICE PAD Ideal Reference Tool Practicing Autos Hovering Etc Printed 3 High-Vlsiili Neon Oranges Light Weight Durable Non-Shy Accommodates 30-60 Size $1495 5tH Check MO SOC VISA Oil TX RES ADO 6% SALES TAX Lk,kr ,PAT PFAD MAIL TOIMAGE PRODUCTS PO BOX 566125 DALLAS TEXAS 75356 12141 699-1234 1 PLANS NOW AVAILABLE Easy-to-build WORLD WAR SPAD RED BARON Pedal Planes little pilot age 3 6 will love unique seating toy current top recorded time still held Jim Clem 941 flight made Lakehurst 1990 Labor Day sessions MiniStick postals Tom Vallees MiniStick event continues grow popularity Several Indoor newsletters have published plans models competition has become international scope Model airplane clubs Japan England participating postal challenge Toms club MiniStick rules restrictive event becomes onedesign event expect performance tiny models will soon beyond anyones current expectations Son Gun product Armorall sold protectant plastic parts has used quite successfully rubber lube Indoor models Scale model fliers like because splatters less other rubber lubes similar product Son Gun now reported superior Armorall have tried both Flying opportunities new information available CDs please fill dates after June 1991 beyond Refer January 1991 column list site contact persons safe check contest status phone before leaving home Idaho Kibbie Dome Moscow Andy Modelers AChoice High Quality Modest Price Convenient Size NOT5O KWIK 2t Minute Epesy Lu Tagliafico has set up 3-day contest Kibbie Dome August 8-11 1991 Call write Andy 650-B Taybin Rd NW Salem OR 97304 503/371-0492 details Maryland Goddard NAS record trials flying sessions scheduled auditorium Building 8 Goddard NAS Saturdays 11 am 1030 pm June 22 July 13 July 27 Aug 10 Aug 24 Sep 14 Sep 28 Oct 12 Oct 26 Nov 9 1990 sessions beginning Aug 24 will sanctioned AMA FAI record trials NASA security requires attendees US citizens AMA members license available inspection gate list Continued page 156 WE BUILD YOUR HELl TEST YOUR HELl REPAIR YOUR HELl 6 322 North 7th St 15 vj1 Lehighton Pa 18235 WRITE OR CALL FOR INFORMA TION 112 Model Aviation RV-3 Deluxe Kit Need Only Join Wing Halves Install Tail Feathers Cover Complete Hardware Package Included 85 wingspan G-38 G-62 engine sizes 17-20 lbs weight range information caller wrte PFCRAFr 512 540-4133 PO Box 299 Gonzales Texas 78629 NOTSO KWIK 20 Mm EPOXY lOoz $995 Gas Model Products 8773 Russet Dr Cincinnati OH 45251 deaier cail 513-385-7398 order direct add $260 postage [D.CTEDscec FINISHED LESS FNRqDIO FE G R NEW FBOX VN NUYS L22F & F 23W pTf1.a.emmuneavcmcsn Plans complete full-size patteres material list step-bystep instructions end color photographs Construction ma..,.. ls hardware etc aesilable lumber hardware outJets Some parts available readymade desired List included plens Plane $1495 ea US & Canada Specify plans desired FL Res add 6% tee Add $300 P & H FANTASY TOYS 7958 Pines Blvd Suite 188 Pembrake Pines FL 33024 305432-5198 Habby~Ing3 'II Use CA Adhesives Hinges lull 15 Mils thick 4 mils thicker other leadin brands * Better CA Penetration * Added Strength * Extra Long Life 0 Si BY HINGES P0 BOX 31064-M Billings MT 59107 Dealer Inquiries Iniitedl Wells Cargo Behind. Never Look Back WELLS CARGO Rolling Hanger like makes sense serious RC model pilot has dependable weather-proof transport has convenient safe storage Bird wings spare props radio gear organized ready go Buzzin anytime weatherman says OK Cloud Dancer unit 12 foot ToteWagon model Weve got Wells Cargo just right 6 feet up 3 YR LIMITED WARRANTY PROGRAM FACTORY SERVICE POINTS A TX UTAH US WIDE DEALER SERVICE NETWORK BALL HITCH TRAILERS 6-32 GOOSE NECKS 0 1-800-348-7553 FOR LITERATURE PRICES DEALER & PLANT LOCATIONS SINCEUATU 1954 [1 LIS CARGO PO BOX 729-962ELKHART IN 46515-0729 mostly did looking upwind watching trees grass move New catalog Old Timer Model Supply out better ever Two dollars OTMS PO Box 7334 Van Nuys California 91409 copy Gene Hempel does custom engine work including chrome plating has special Cox 049-05 1 parts 301 North Yale Drive Garland TX 75042 Tel 214/272-5210 Dave Haught has plans rubber CO2 scale models early days aviation likely appeal Old-Timer fan has just sent printer new book Building SAY YOU SAW TIN MODEL AVIATION Kids will have over 20 plans ideas teaching youngsters model building book will $20 pp list plans can yours SASE Haught Graphics Rt 1 Box 978 Munising Michigan 49862 Plans rubber model towline glider kits old 1938-48 Best-by-Test Model Company can purchased designer Edward Schlosser PO Box 412 Ridgefield New Jersey 07657-1418 also has number items hardware interest rubber fliersthrust washers tension springs 14 inch machine-carved balsa propeller etc SASE should get catalog ctric Vacuum Bagging System Foam Core Wings $74 95* Complete Easy Use Add 55 SlVppIOg handlIng Colitorno resldenls odd 0 5% soles lox Dealer Inquiries Invited VISA Mastercard Accepted sheets will show copy old ad general arrangement drawings models Altimeter Stratometer have popular recently SAM small cabin stick events larger 44 span Enduro stick Sensatherm Cabin should become popular also light structurally simple welldesigned duration models FF Indoor/Tenny Continued page 112 compiled Tom Vallee must notify Continued page 160 5501 WCOMO SANTA ANA CALIFORNIA 92703 714 826-6861 GO FLYING WITH COMPLETE ROLLING HANGER LIKE THISI AIR WOLF EPOXY FIBERGLASS FUSELAGE S TAKES MOST 50-60 MECHANICS OTHER MODELS AVAILABLE LARRY JOLLY MODEL PRODUCTS $21000 GATOR TRANSMITFER CASE *Sturdy wood/metal construction Waterproof vinyl covered exterior Convoluted foam liner *Durable hinges latches withstand rough handling eAccomodates single two stick transmitters Protect expensive transmitter.$2495 feather lite GLASS CLOTH 7 oz/sq yd weight close weave makes glass cloth easy filling extremely light finished weight Big 3 sq yd package detailed instructions$895 SOFT-N-SAFE MOUNT type englne soft mount using special serrated Iso-damp grommela Englne always safely retained Vely effective vibration reduction dramatic decrease englne shake Available veiy light machined alum beam mount 60 2/strokes 120 4/strokes Also available alum plate radial mount 60 2/strokes SoftNSafe 120 beam mount complete 5 SoftNSafe 60 beam mount complete 5 tSoft-N-Safe 60 radial mount complete 5 *SoftNSfe replacement Iso-damp grommets Specity soft firm Pkg 4 295 RADIAL ISO-MOUNTS Conventional plate type mount using four Lord/type Iso-mounts Soft 50 duro yellow finn 60 duro purple Iso-mounts available Optimized lowest vibration transmission airframe *60 Radial Iso-mount complete mount 95 Specilr soft 50 duro firm 60 duro Iso-mounts Pk& four 995 5/8 diax 1/2 long 8-32 female end 8-32 x 1/2 male other end Specil soft 50 duro yellow firm 60 duro purple BAT[EKY MANAGEMENT System MOSFET nicad cycler $18995 MOSIET nicad cder designed specifically planes boats helicopters wIth 3 overnight/trickle outputs capable charging 1 9 cells infinitely adjustable FIX overnight charge current ability discharge both FIX TX packs digital discharge timer 3 outputs allow simultaneous separate charging lOt TX AUXILIARY eg glow plug starter battery nicads rilcads will charge overnight rate 17 hours 4 minutes before automatically switching trickle rate Adjustable control allows charging FIX pack up 2000 mAti capacity TX output can discharge 8 9 cell packs 500 mA IIX output can discharge 4 5 cell packs 300 500 mA True Constant Current sources used charge/discharge modes power up fillS Ol1E will always come up overnight charge mode ensuring fully charged batteries event momentary 110 volt power loss Utilizing Current Detection Circuitry LEDs can illuminate wtten current actually flowing out batteries Large digital display anti-glare filter shows FIX TX discharge times Unique CAPACITY CALCULATOR will allow milliamperehour rating batteries determined RK ELECTRONICS 5INOVATIVE ELECTRONICS 504 Fox baa Nuaa New lfiauaplire 03051 882-6022 FF Indoor/Tenny Continued page 156 Tom intention attend advance meet Changes NASA launch schedule other possible events can pre empt auditorium much warning sure verify date Tom before leaving home Tom Vallee 444 Henryton So Laurel MD 20707 301/498-0790 Indoor model stability October 1990 column began discussion stability stability margin sketch shows relationship between center gravity CG aerodynamic center AC tail moment arm MA definition MA distance between 25% chord points wing stabilizer distance between CG AC defined margin stability As long CG front AC model has positive stability model tends recover forces upset Prepaid Orders Money Order Certified CheckShipping & handling $500 COD Orders Cash Certified Check collected delivery Add $550 above amounts DL4LEE IrIQLJIWES IflVITED Prices Specifications Subject Change WIthout Notice Designed manufactured USA flight path CG AC same distance nose model neutrally stable will try recover AC front model will tend increase upset December 1947 Air Trails Hank Cole published article Center Gravity Question gave full explanation aircraft Continued page 162 FOAM CORE FLOATS FOR AIRPLANES AND HELICOPTERS V HULL FLOATS FOR 430 POUND AIRPLANES CHOOSE FROM PLANS KITS OR READY TO PAINT ALSO FLOATS FOR 410 POUND HELICOPTERS AMSOIL SYNTHETIC OIL DEALER SENO SASE FOR FLOAT OR OIL LITERATURE KIRCHER R/C PRODUCTS INC O SHEFFIELD WAY CLARIK N4 07066 MIGHTY LIT PREMIUM GRADE LIGHT PLYWO D Now available insizest NEW 1/46mmthicknessfl 6x12E 12x24U 12x48 Complementing 1/83mm thickness U 6 x 12E 12 x 24E 12 x 48 HOUSE OP BALSAFRANI flANO ENTEPI1ISES 20130 STATE ROADLJL 16300 ESTANA LANE CERRITOS CALIFORNIA 20701 213 0601276WEST PALM lEACH P133414 TEL 407 746O0 160 Model Aviation UHET YOUR ENGINE $395 u Keesfrlrilf neigh Stable rsbber/labnc 96e*iie asSess sImIan between engee aid aseunt mssnl end limwsIl Sheet 2kx4xlw ate Cstswthbladesrsas em mietis hi minsits V&rhs wherever litres selisfied Send ciutenreurey eider len 1556 pta P51115450115 k71~~ ude 5250/Item UPStPL Residents Add 6% Tax GTOR R/C PRODUCTS 3713 Pompano Dr Pensacola P132514 904/476-8639 Serious Horsepower11 05. ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shadel Performance Specialties / Available YS Long & Short Stroke 06 Long Stroke OS 6IFSR 06 40 VRP/VF 0S 91 VRDF STX-40 Rossi 40 coming soon information Call 618J 728-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 Send $1 0Ofor fully illustrated catalog stability years later Charlie Sotich suggested apply Hanks ideas Indoor models article Hank covered factors will discussed Indoor fliers can greatly benefit using simplified application principles Hank discussed Hank summarized design ideas graph allows us determine correction factor CO specific particular model design Charlies suggestion developed graphic approach locating Indoor model wings best performance almost Indoor model design possible locate wing sockets correctly before first ever flown critical factors wing stabilizer aspect ratios AC Cf tail moment arm I VALUABLE COUPON 7 Flying paper CORSAIR $400 2for $6 lOfor $12 Etuild ny IS Just 2 Hour pails Pre-cut & Painted W W Ii olor nch Wingspan ch Prop]flcliIlrh Wah MotorPOWER KIT II catalog 3000 planca $18 $23 Foreign Refundable what order over $25 • RC paper airp1ars PAPER AIRPLANES 433 NIHOA STREET KAHULUI HI 96732 USA Send wia deLoL pit p&w Definitions following terms symbols will used rest discussion Average chord squared divided area Aspect ratio ected span divided average chord CG nce point complete model motor LE ing edge R aspect ratio Rt aspect ratio TE ling edge Hank Coles graph computed using formula Cf * Rt * R * Rt ank used formula compute aerodynamic center AC area * MA * Ce/wing area Figure 2 shows factors required compute AC model has already assembled Assume Easy B model 3 x 18 rectangular wing 2 x 12 rectangular stab 11 motor stick 11 tail boom wing leading edge 4 nose model balances 6 front end figures can compute following values Figure 2 X 7 Z 18/3 6 Rt 12/2 6 wing area qin stab area qin Cf * 6 * 6 * 6 0519 Compute ACFrom wing TE 075 x 3 225 25% wing chord point MA Z 4 1575 in 11 boom length75 * 2 AC 1575 * 05 1954 in behind 25% wing chord Since CG FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWEF 4 OH PLY FOAM AND BALSA WOOD KIT $6995 225 behind wing 25% point AC 363 behind 25% wing chord margin 363225 138 Expressed % wing chord margin 138/3 x 100% 46% After several years checking winning models Ive learned margin 5% 015 3 chord about optimum Indoor models graphic solution assumes initial stability margin 0% CG AC both X nose Remember TE 225 behind quarter chord point example model Compute AC two wing locations such 2 6 nose two wing locations Z 5 Z 9 respectively AC two Conunued page 166 Rubber ft Engine Pawer Free Flight Diepley Control Line Electric Power RIC Airpienee new illustrated 32 page tabloid size cetalog US ft Cenade *100 Foraigh $300 Penn Velley Hobby Center 837-A W Main Sr Lenadela PA 1944S 215- 3U4770 Antiques Military Civilian Heiicopter Sailplanca 3Oaa pbS10000 3-mw aawngs color FOTOPAAICShwiuing KOKU-FAN 162 Model Aviation 10 SPAN 30-3, LOO ou-o .u POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKrn$1995 SEND $100 FOR CATALOGCART 1 NEODESHA KS 66757 OF SAC KITS AND ACChtfh316 325-2821 FREE SHIPPING ON KIT ORDERS~ianaconwonvVISAASTERCARD 10 SPAN 19- LOO o-42 CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 APC PROPELLERS Sound Supression Design High Thrust Efficiency Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals World Championships Sports Sizes 57x3 7x3 7x4 7x57x67x7 7x8 7x8 7x10$159 EACH 8x4 8x5 8x6 8x7 8x8 8x9 8x10$179 EACH 9x4 9x5 9x68x7 RxB 9x99x10$19BEACH 95x45 10x4* 10x5* 10x6 10x7 10x6 10x9 lOxlO.S229EACH 11 x6 11 x7 11 x8 11 x9 $249 EACH 12x6 12x7 12x8.$2B9EACH Reverse Pitch Pusher 2 x 6 lOx 6* lOx 7* lOx 8* 11x6*11x7*$395EACH Competition 78x4 78x6 78x7 9x65 9x75 9x85$395EACH lix 10 lix 11 lix 12 lix 12W 11x13 11x14 12x9 12x9W 12x10 l2xlcMJ 12x1112xllN 12x12 l2x12N12x13 12xl3N 12x14 125x9125x10 125x11 125x12 13x8 13x10 $795 EACH 135x9* 135x125 135x14 14x614x8 14x10 14x12 14x13* 14x14 144x105 144x12 144x13*15x8 15x1015x12 16x8 16x 10 16x 12 . $1295 EACH New sizes Contact local hobby dealer first doesnt hove whet need order direct 916-661-6515 Manafach,d Landing Poducts PO Eoa 930 KnIghts Landing CA 95045 2 conditions 317 respectively Case 1 AC 1775 * 05 1954 behind 25% wing chord Z 5 AC location S in225 684 nose Case 2 AC 1375 * 05 1954 behind 25% wing chord Z 2inY 9intheACis9in -225 992 nose Figure 3 shows computed data plotted graph dotted line labeled 0% Margin As noted above 0% margin unacceptable heavy line marked 5% Margin added graph time mount wing posts assemble model prop rubber motor minus wing Determine balance point example assume balance point 68 nose Draw vertical line 68 graph 5% margin line horizontal line intersection left edge graph line intersects ordinate 522 showing rear post should 522 nose However result places wing ahead balance point assembled model wont balance first test would indicate correct oversight attach weight equal wing weight one-half chord ahead 522 point new balance graphic solution PRODUCTS FOR ThE DOSCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes Headers uri Mufflers Expansion Mufflers * Helicopter Ball Mufflers ialized Exhaust Systems Unsurpaasd Ward test should give good location rear post Note second balance test should made computed wing position centered over balance point stability margin example above simplified having constant-chord wing stab Finding required average chord easy wing stab outline symmetrical surfaces sweepback non-symmetrical taper much difficult analyze Perhaps easiest method finding average chord oddly shaped surface make scale outline surface suspend opposite corners shown Figure 4 sure outline free pivot easily centroid outline will directly below pivot point plumb line can used ADVANCED AERO PRODUCTS YS & OS SLEXPASS 20 EXHMST NYSTEDSEAU ER WRITE PER RfN4RTER MrTIRII AIftcNAFl ANNE ULENAIN IWO AEVANCEO AERO PJCTO fRI NOR 26-C MARt TX TRERO 014 924-3946 WORLDS BOCEEST SCALE PLANS & DOCOXONTATION SERVICE 70005 IjAft Pkt,, SAP&07 SCALE ISOEL PLATO RAAAA I..FIt*A SA SAi 100 PAGE CATALOG IS*AAC So NS ENLAROINOOXON Mdlsofl An. XTeSsRoo NE 2740X SCALE OEEAueNEATIRNXSN292-625 ss un Frice two magazines can own conxehensive downent $ut RC Soarig kxkistry has offer NSP Soarkig Refererice Catalog rpesents two years research effat Peoie toi us Uat 1990 catalog tie best iwesbient ever made sport Wel 1991 catalog ger betteil order yaw NSP RC Soarig RefererEe mid Catalog send check money order $&00 NSP 100 pages product information Articles Reviews specs Fully fllustrated est catalog RC Soaring complete re-do 1990s catalog must4iave reference lNortflLaSt aupIane rrouucr5 16 Kkby Lane Wllston Vemiont 05495 O2 658-9482 166 Model Aviation U N ** 4620 CRANDALL-LVILLE R DON INDIANA 47112 e se e ion o emo e ro 0 e irp anes e pro essiona lMILISTED BELOWIn Business since 1973 PRICES SUBJECT TO CHANGE WITHOUT NOTICE IS JUST FEW OF THE MFG WE STOCK HOURS MONDAY THRU THURSDAY9AM 5PM FRIDAY9AM-2PM CLOSED SATURDAY& SUN AY PHONE 812 366-3141 A-JUSTO JIGPOX AMBROIDFUTABA FFORD KITS AVAILABLE SHORTLY ARCO RUBBERBANDSGOLDBERG 4 TWIN COMANCHE COMANCHE & MORE BRIDIGAS MODEL PROD DAVEYS SYSTEMSHALLCO COVERITEHOBBYPOXY DEVCONHOT STUFF DREMELK&BMFG DU-BROSIG DYNAFILITESAITO SONIC-TRONICS STERLING SULLIVAN TOP PLITEMSCEI1995 EAA AKU SPORT VS ENGINES$1 LAN ER121 MILLERStafford 0AE FOB PAOEOO NORTHEASThr~EDBA AS ONON ZINGER PROPSBOX OF OPdOOEO 0 . -0r~ complete listing etcplease senda stamped lope DEALERS j self-address enve WANTED 0 STAFFORD AIRCOUPE $9995 KITS Glue NStgckum j Buildum & FIyum need help call us ~gjt boxI AFTER HOURS CALL WE MIGHT BE HERE fuse geI THANKS FOR YOUR BUSINESS BILL & JOYCE mark two lines will intersect center average chord chord location must used compute wing location method model balance may seem complicated have used since 1972 great success time has ever failed failed second balance test correct wing weight erk knot world Indoor flying seems thrive rubber knotseveryone has favorite method tying up motors problem knots delicate elaborate knot adds unnecessary weight tying process scuffs rubber knot may fail knot doesnt hold lose motor may too short after tied again may lose flight whole model simplest knot Ive tried shown Jim Clem gave unlikely name erk knot photo shows starta simple overhand knot both strands Moisten knot snug up almost tight possible Next coat outside edge knot lightly super-thick grade cyanoacrylate glue quickly pull knot tighter Jim claims listen closely pull will hear erk sound Examine motor strands exit inner side knot glue showing used too much finish knot trim ends about glue together have used knot both tan Pirelli excellent results has two advantagesit potentially lightest knot definitely uses less rubber other knot know Super shears photo shows excellent toolkitchen shears Chicago Cutlery heavy-duty shears super-sharp extremely durable also come apart cleaning can used knife Dallas available Dillards Heres quick effective method mounting model components inside carrying box plug-in Pennyplane stab see photo has secured strip tissue holds against block tissue glued down end other end uses pressure-sensitive label label will release easily re-usable can quickly replaced necessaryD F-i 5/Conover Continued page 59 start launching thumb forefinger left hand grip subrudder very back fuselage Point nose up 45 degrees bank slightly left Start half-power launches As increase power youll notice interesting change lift characteristics delta wing Both swept-back delta wings have critical flow change reach higher speeds center pressure shifts airplane noses down Overcome dip trajectory elevating nose course could always execute Heinie Dittmar Continued page 172 KSB FUEL SHUTOFF TIMERS Again now available CIT lFF llcrrII ~J $1750 Shipping $250 up toE Units Over 6add35each Exclusive Importer Jet mm Lightest PILOT BUST hasr Modern Jet Helmet Face Mask Oxygen ... ai~l RecognizedC5A Certified E26226File NoPesnen Pile No.aJ LR2O1 54 Onip certified checks o money orders accepted Minimum orde $1400 three packages 4 Powerpoles 15400 per peckage $200 chipping end handlingi CT residents edd sales tao Prices sahject change notice DEALER IRQUIRIE5 INVITED further information end dealer prices send SASh end Business Card SERMOS R/C SNAP CONNECTORS Inc Cedar Corners Station Box 16787 Stamford CT 06905 12031322-6294 July 1991 167 F Model Supply u~L PO Box 3957344 C E CARSON TORRANCE CA 90510CARSON CA 90740 TEL 12131 830-9939