BD-4

Built competition AMA Rubber Scale class small version Jim Bedes BD-4 homebuilt has flown well designer Don De Loach youve got little modeling experience dont feel quite ready big time Rubber Scale version Jim Bedes BD-4 home-built may just ticket EDon DeLoach THE YEARS after Second World War doubt time rediscov ery late Forties early Fifties saw rebirth old American classics war dampened Aviation too enjoyed rebirth time people flying ever before catching new aviation craze homebuilts Homebuilts homebuilders havent changed much since years found ing Experimental Aircraft Associa tion EAA now governing body homebuilders sport aviation enthusiasts US gave aspiring designers builders firm footing start such designer Jim Bede Bede hit homebuilt scene early Sixties sport aviation state extreme growth prosperity Bede set out late 1967 design entirely new airplane hoped would surpass others aspect performance wanted first off economical ship both construction cost operation Furthermore Bede turned off draggy-old-crate designs small slow wanted design classy airplane wouldnt look like just old homebuilt resulting airplane everything expectedand Dubbed New Gen eration Homebuilt four-place BD-4 homebuilders dream Construction simple clean bolt-together steel tube structure lightweight ply wood covering maximum streamlining 60 Model Aviation Tricycle landing gear upswept wing tips racy lines make eye-catching model Designer/builder Don De Loach has won some handsome trophies using nicely crafted lightweight rubber-powered craft Full-Size Plans Available. See Page 188 REFERENCES PEANUTS PISTACHIOS Vol Iv BY WC HANNAN 1989 2 AIS.PROGRRESBE3S 6/70 8 0/70 3AIRCRAF[ BY DAVID MONDEY 973 4 NATIONAL AERONAUTICS SPRING 1971 SOFT BALSA W\ PROTOTYPE 60-4 WAS GLOSSY WHITE WITH RED TRIM AND RED N624BD ON FUSELAGE MAKE SPINNER FROM MEDIUM BALSA SPIN ON DREMEL OR MEDIUM BALSAVACU-FORM BLOCK HOLLOWED OUT TO 3/32 THIN ACETATE WINDSHIELD WINDOWS GLUED ON INSIDE FOR REALISM7 J/r M/r 50 LIGHT VERY HARD I/B X 1/16 NOTE BEST MOTOR TO DATE HAS BEEN FAI TAN 3D LOOI STRIPPED TO 116 WIDE MAX WINDS 2150 BEST TIME INDOORS AT USIC TO DATE 90 SEC CONTEST RECORD 3rd PLACE 1990 AMA NATIONALS/ USIC INDOORS 1st PLACE 1990 PLANESMEN REGIONAL CHAMPIONSHIPS FORT WORTH TEXAS OUTDOORS SUMMEE ALE OUTLINE PROTOTYPE WT 16 GRAMS VERY HARD 16-ID 1/16 SOUARE PROP DIAMETER 6 PITCH 9 MAKE FROM MEDIUM BALSAHELICAL PITCH SPAR FROM MEDIUM 1/16 SHEET 1625 HIGH LATERAL CO AT SPAR 5-7 DOWNTHRUST 2 2-Y RIGHT THRUST 3 TAPE RUDDER TABRIGHT 3/16 4 1/16 UP ELEVATOR COVER MODEL WITH WHITE JAPANESE TIS SUE USE NITRATE DOPE FOR ADHESION -1/16 SHT GUSSETS/64 PLY BACKPLATEFIN FROM MEDIUMLIGHT 1/16 SQ 3/16 SHTHARD AIRFOIL- FB 37-ID MAKE 1/32 MW MEDIUM 1/16 50 HOOK- LATE FROM 1/32 PLY THROUGHOUT/ ///// I/32SHT 3/35 OD ALUM- 1/16 SHT VERY HARD 1/16 BR ACESSO LONGERONS IiAIRFOIL ED //WHEELS FROM LIGHT /LMAKE FROM PAPERBALSA SPUN ON /AND EPOXYDREMEL 037 MW 1ii SHEET ELEVATOR HINGE ELEVATOR WITH THIN ALUMINUM FROM 12 OZ CAN USE WAPIF PN ROL OUTLINES MODEL AVIATION 969 BEDE BD-4 61/2 SPAN RUBBER 6ALE NPOWERED SCALE MODEL LUDESlGNEDYAA.g 013456 INKED 20 AUGUST 990 wing cantilevered rarity small homebuilts zero dihedral specially designed airfoil BD-4 could built plans factory kit complete 150horsepower Lycoming engine $5920 finally Bede added professional touch tricycle landing gear option trike BD-4 looks like high-class exec utive speedster retrospect BD-4 accomplished everything intended mid-Seventies 500 planes built plans kits streaming daily Bode factory day still quite few flying new built once advent composite construction has caused designers including Jim Bede change ideas favor newer advances Nevertheless BD-4 survives today whether full scale Rubber Scale form design BD-4 Rubber Scale no means first As early 1971 FF Scale community already heard airplane designed very good model versions Among plans Bill Hannans Peanut version probably models built today full-scale BD-4s case BD-4s pretty lines excellent propor tions impetus design airplane presented CONSTRUCTION model de signed specifically novice builder mind although covering model Continued page 176 Wheels balsa blocks turned lathe perhaps Dremel tool Note hole nose block propeller thrust button access rubber motor winding aid protection wInding tube Nose gear wire laced onto wide fuselage crosspiece thread coated glue February 1991 61 structure simple easy build yet successful model requires careful attention selection balsa having correct grain weIght plus painstaking craftsmanship PROPELLER SAFETY MESSAGE safety precautions designed enhance enjoyment model flying should part modelers routine both flying site workshop 1 Select correct propeller size following engine manufacutrers recommendations 2 Before using plastic props remove flash along edges propeller scraping pocket knife 3 Install propeller using correct nut washer airfoil side forward securely tighten Recheck after flight 4 Use chicken stick electric starter start engine make adjustments behind engine 5 Keep spectators least 20 feet away out path rotating propeller 6 Wear safety glasses hand protection operating model engines permit objects touch turning propeller Remain clear propeller arc 7 To stop engine cut off fuel supply accordance manufacturers instruc tions case DO NOT stop propeller hand other object 8 Inspect propeller after flight Discard propeller has nicks scratches other visible defect DO NOT repair alter orin way modify propeller 9 We strongly suggest propeller tips painted order increase visibility turning rotating propeller can cause serious personal injury FOLLOW THESE INSTRUCTIONS CAREFULLY WINDSOR PROPELLER CO 3219 Manier Cr Rancho Cordova CA 95742 should adjusted about 25k ohms about center position connected shown encoder wiring sketch switch unit will provide on/off operation channel keep within its prescribed time period Once entire system set up find single servo noisy buzzes jitters recheck input device settings okay check whether servo properly centered isnt refer manufacturers instructions adjust servos centering Next month Ill conclude discussion overall system connections insulated lines wir ing planes battery supply way sulating line clips Heres listing Ace R/C parts used portion project digital proportional RX decoder #12G15C $1895 plastic decoder box #PLA2Ol $2 Deans connectors three-pin sets @ $175 per set and/or three-pin Deans con nector block #19K22 two Bantam servos #14G26B $2645 Approximate cost decoder assembly two channels $85 $90 including miscellaneous wire solder batteries Please send ideas notice upcoming CL Scale events contest reports especially photos CL Scale activity address very top column cremental control Before can adjust con trols must understand something about movement affects particular channel encoder input encoder capable seven-channel opera tion purposes explanation tets assume seven channels will made operational achieve creating channel-tochannel interference encoder must able read control channel independently sequentially Lets imagine time line channels has predetermined space equivalent time two milliseconds ins Lets further imagine during specific portion 2-ms time period channel operationat sensi tive input control movement operational time period can defined 15-ms point 05 ins overall time per channel objective control vary through use input devices voltage input channel during its operational period two devices using switch AUX/LEVER allow us control channels two modes switch unit instantaneously shortens lengthens op erational time period 15-ms point 1-ms 2-ms point on/off-type control channel other hand AUX/LEVER variable resistor allows us control channel continuous incremental manner between 1-ms 2-ms points its operational time period properly adjusted AUX/LEVER unit 5000-ohm 5k variable resistor will al low us continuously control channel ad just unit put lever its center position measure resistance center termi nal outside terminals ohmmeter should measure about 25k ohms either side side gives higher reading other adjust turn U-shaped device back unit until both sides measure about 25k ohms now move lever side other resistance reading center ter minal outside terminal should have range about about 15k ohms connected encoder resistance range will keep varia tion input voltage range permits contin uous operation channel well within 1ms 2-ms time period input voltage ex ceeded range making channel operational longer 2ms possible spillover other channels time period could cause loss synchronization encoder As result ser vos connected system could become noisy jitter possibly run free switch input unit has two 5k-ohm trim pots BD-4/De Loach Continued page 61 sufficiently challenging task preclude rec ommending first model fact BD-4 boxy anyway makes natu rally easy build Further has scaled directly Bill Hannans threeview can sure true Scale model can competitive contest indoors out Begin construction building two identical fuselage sides directly over plan Beginners Remember layer plan Saran Wrap wax paper first prevent glue sticking structure plan important choose glue wisely almost models con struction lightest strongest selec tion has given great success Tite bond Elmers wood glue though Am broid Duco would probably job oft THE FIRST PRECISION-ENGINEERED ENGINE MOUNT e THAT PROVIDES VIBRATION-DAMPING SOFT MOUNTING uSA IViounI WITHOUT EXCESSIVE ENGINE SHAKE AT ~M e n very soft mounting excessive engine shake low RPM due damped nonlinear force-displacement characteristics mounting system vibration mounts loaded compression shear Thwat forces cant causetensiOn failures constructed aluminum oil resistant tomer Safety featureunique mount design captures engins airframe ught weighte55 standard aluminum hard mount Allows lighter front end construction Radial beam mounts available 40-65 7011 12-18 cu sizes hardware complete installation instructions included 60-day norisk money-back guarantee direct orders Radial Meant21Y5 23Y4055 zepI,ewo 701155524w 7011 ize 52555121 5 size 52505 121SSZO 53155 oflware10319 Pine Pass Drive Houston TX ssociates Viso MsslerCard COD ac55pted Dwtor isqoirse ovtcwsr 01 Asoorn15e 176 Model Aviation b lln just well sides diy pull off plan make horizontal crosspieces point can either join fuse lage sides together air greater accuracy build structure over plan latter difficult time-consuming finished fuselage will stronger straighter feel combination two methods best whatever youre used Theres no right way Next select medium hard block balsa make cowl first step cut sand outside shape perfectly shaped ready glue hollow out inside A-in wall best way to use spherical stone tip Dremel tool Before glue cowl find cen ter cut square nose block matches size plan diameter winding tube Now bend front back landing gear wires music wire main gear wire standard %2 nose gear wire since prone bend easily during hard land ing ask know should made 037 wires bent glue onto respective cross braces tak ing care well aligned level fuselage may now set aside cov ering Begin work wing cutting ribs medium A2-in balsa best way balsa stripper rib stripper using plywood template guide However may freehand careful Make ribs /6-in high Build wing over plan same way fuselage sides built first step select carefully wood will used leading trailing edges wood should straight hard very straight-grained Take time select best youve got Pin leading trailing edges onto plan Beginners Never stick pins through balsa strips Doing would weaken Use pins alongside strips align over plan pin pushed building board angle LET WATER FEVER TAKE YOU OVER LANIER RCs SEA BIRD CAT NO 87206 EXPLORE THE ADVANTAGES OF WATER FLYING WITH THIS SUPER INTERMEDIATE TRAINER Fuselage Length 45 Rec Engine Size 40-60 60-80 4 Stroke Flying Weight 5 -6 lbs Wing Span 60 Area 630 sq Radio Channels 4 WRITE TODAY FOR YOUR FREE COLOR CATALOG PC Box 458Oakwood GA 305u6404-532-6401 MADE IN THE USA can used hold balsa strip down against plan begin gluing lightweight A6-square diagonals bot tom Next comes spar made /16 ex actly 1625 high spar must three pieces shown plan until dihedral added after construction very important After spar come ribs Glue carefully making sure aligned adhered well both spar leading trailing edges glue has dried remove outer wing panel miter leading trailing edge inner joints dihedral Finally block up wing tip glue dihe dral % tip making sure wing level perfectly straight glue warp wing drying build stab fin subrudder light dium /16 wood As done building wing leading trailing edges should fairly hard wood rest structure can much lighter wood look stab youll notice Ive included scale adjustable elevator eliminates having move entire stab decalage trim changes Hinge eleva tor soft aluminum sheet shown plan Another note stab Ive included scale outline dashed highly rec ommend stick ealarged version first flew prototype small stab hardly flew Im sure possible make model fly small stab ualess superexperienced Id say use big itll save lot headaches Now return wing should dry now carefully remove plan Select two softest lightest pieces balsa have wing tips Glue rough blocks shape theyre place Carefully cut sand wood until have flush rest wing Also note tips upswept ie curled upwards efficiency measures Bede emFebruary 1991 177 DIGC~ES monthly publication covering international RC Soaring Scene mUSk $l9yr$26/yrlstClass In CanadmIMsxIco $26/yr US funds Asia & PacIfIc $42/yr US funds Europe & UK $36/yr US fund Surface IhH ForeIgn $22/yr US funds R/C SOARING DIGEST PO Box 6660 Concord CA 94524 9 HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 CAL 415 783-4868 Out CAL 800 482-8663 L WWEre proud announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT TATONE PRODUCTS CORP Thank wonderful year THE ZAP GANG FTE ROBART HOUSE OF BALSA PACER TECHNOLOGY ployed BD-4 speciallydesigned wing tip still used extensively day significantly reduces aerodynamic tip loss Take time get shape right will enhance wing aerodynamically finished wing looks better normal tips 0 After youve given components careful sanding its time cover course best covering use type model Japanese tissue adhering tissue use nitrate dope though buty rate would probably work just well Covering like almost other aspect model building highly individual suggestion can give work slowly carefully time run trouble cov ering try rush Dont try cover model size day usu ally takes three four days pro perly take time will have learned value patience because finished product will look better ever expected simplest terms covering applied panel time bottom wing panel top left fuselage side right etc surfaces have covered time shrink tissue water al cohol Take step back listen cause point almost everyone has ruined otherwise good model cul prit course dampening itself often leads terrible warps seg ment model may safely soaked fuselage never warps Pay careful attention wing espe cially empennage recommend light misting alcohol airbrush dont have airbrush apply care fully fingers cases either practices will work warp ing wing Next come stab rudder Ive gotten such bad results Ive tried shrink surfaces now usually dont try have airbrush youd like try some shrinkage go ahead dont surprised surfaces end up looking like prop blades youre done Again aspect hobby no has figured out just what works Some builders pre-shrink tissue before covering surface As far finish tissue con cerned two coats thinned least 50/50 plasticized nitrate dope works well point also need decide whether want paint model As can seen photos BD-4 painted airbrushed colored butyrate unless practiced dont recommend does add weight painting extremely time-consuming plan setting aside extra week two plan paint model An alternative painting use strips colored tissue doped top basic covering 0 finished covering finishing model work some scale fea tures details before assembly important windows windshield Both put inside unlike FF Scale ships accomplish cut out tissue top fuselage wing glued youll have space Antiques Military Civiliarl Helicopters Sailpianes 3000 P&JS10000 3-siew a0a0gS co4or FOTOPAAXSInctedng KOKUFAN ** * r ** ** ** * * Custom Graphics rate model stars circles triangles club logos scale manufacturers insignia . name tl Peel stick remove masking its done AMP Graphics prespaced alignment assured costs littlel Try us AMA number combination 10 letters K numbers computer cut 2 high Iblack whitel ppd introductory price $295 . printed information send $100 p&h K dont delay inquire now have information need iti Call write todayK 4AMP Inc Graphics Dept MA PO Box 7934c DeerParkNY11729 516 595-2849 NYS Ftesidents add aelos tax4 178 Model Aviation LATHES MILLS METALS AOOKS -___PRECISION INSTRUMENTS COMPLETE CATALOG $200 000em *iL &44AIP1ELL DDLS Ce COMPAC 5 re-fuel engine between flights doesnt make UEIIOli sense re-fuel radio system flight batteries ANSWERi YOU BET IT DOES run out fuel land dead stick no problem run out radio well know rest story IR NA Tp EI RD FC LH IA GR HG TE BP1 RAPID CHARGE AAR PACK -$1895 FC1 R-1 CHARGER & CYCLER -$5995 INTRODUCTORY COMBO PRICE -$6995 Tel408 778-4832 brochure Shipping handling $300 CA Residents add 725% TAX Airborne Electronic Systems 16055 Caputo Drive #D Morgan Hill CA 95037 Serious Horsepower1 0S ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shadel Performance Specialties i2i i11 &i yJImJj bJi Available YS Long & Short Stroke 05 Long Stroke 05 6IFSR 06 40 VRP/VF 0S 91 VRDF STX-40 Rossi 40 coming soon information Call 619] 729-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 Send $1 D0for fully illustrated catalog work Now must some real brain surgery get windows place must cut very precise size adhered Ambroid RIC 56 Take time best job possible realistic effect will achieve will well worth effort Several other details should completed before assembly Mark control surfaces panel lines fine permanent marker such fine Sharpie spinner wheels should spun light balsa Dremel tool Hollow out spinner attach nose block assembly Both prop nose block fitted bushings bearings made A6-in OD aluminum tubing prop shaft %2 music wire final step add cowl intake landing gear fairings Now thats left putting tog ether Again best glue use slow-drying wood glue Glue surfaces together making absolutely sure aligned level let finished model dry overnight THE RUBBER MOTOR estimate motor required models built plan will between /8 /32 wide depending models weight best motor far has very long motor 30 116 wide However model also fairly heavy 17 grams youre about 13 grams %2 ought Conversely model 19 20 grams will probably require somewhere around / case install motor thats fairly close figures go out field test flights INITIAL FLIGHTS center-ofgravity approximately have plan make short test glides until model settles nice floating descent will probably have add small amount Up elevator did least bit nose weight model gliding consistently begin making short powered flights motor wound 100-200 turns BD-4 actually easy trim figured still going well fairly short pe riod time its its best model really per forms indoors out got 80 seconds USIC model still new finely tuned its re cent outing contest fall year achieved two consecutive maxes flights first being over four minutes ROG Thats riseoff-ground takeoffEd case model 14 15 grams will easily able 90 100 seconds indoors out doors Well watch out thermals Good luck good flying D responding advertisers mention read about Model Aviation FF Scale/Warner Continued page 63 will control tissue shrinkage applied dilute form Peter sends along Englishlanguage brochure Otsuka Pharmaceuti cal Co lists whats descending order have sugar polydex trose water-soluble dietary fiber vitamin C citric acid sodium citrate extract guarana nat ural caffeines monosodium glutamate fla voring Doesnt sound too appealing health nuts what MSG sugars tis sue trimmers may just thing Now have experiment some native products see ingredients does job combination Thanks Peter Hetherington Mosquito Old-timers will re member P F Norman British violin-maker models built order Centur ion tank Mike Hetherington contemporary P F has taken just opposite path has come up Killer Mosquito Mik Mikkelson just back Tight Little Island won Earl Stahl event Spitfire reports Hetheringtons Mossie must seen believed Weighing about six ounces model fea tures Tomy-timer-operated retracts rubber band assisted picks up gear takeoff two rubber motors nacelle geared front pre-stressed bulkheads made / x /32 sheet wrapped around foam core wrapped another /32 sheet model done yellow tissue scale Bill El finger * Says Oniy Plan rt Patten05 Sets giveQuarter Scale WW assoted designs want have selected best classic designsSE-5A tiete choose patterns partanan important80% wing span sq exclusive teatuewing atea 2 engines Curtlss HAWK PlCRCOS7 8249810 94% seingspae eegebSPAD CXIII 2268eqinwitgaea Pad 3to 7$Ywingtpan2125s0 23 ctD eegiees aceel Sic ing aea t 3 31 engines RCQS-t4 5 Capable flynt capturee Curtiss FALCON O-IB/A3 114 wiegspae aegnh COS 8$2795 3l805giewiegaeeaFor23 aPOKKER DR-i TRIPLANE 38 CtD cegiecs aeeel Scf%1~J~ pan 2 sq SCOS13 8w 8to 1bO enaines RCQS-882495 One-Third Scale Piper Tn-Pacer PA-22 SOPWITH CAME t18315 wisanene 2358 sq in.80 wing epa wies neon 28 te 3a old segiseswing area oe 45 oh SIC nn t2 lbs waod 9 balsa Bttla noeell lnegthOSsq ft dra 8C3g3$2995RCQS1 83g old enginellCoss -824 1/3 Scale Piper Cub J3Pokker DV tt5 noes span Ag Isegeir 80 wingspan .2gg8sso wiegetee 4nhRIC gg25vid 8C38282998 Far 28 ta 38 ClO Engines Weighs appens 14 lbs liens 5/Cl Far 45 Chaeeal sic Clark 0 Plan Bettantl Aletnil lerieb Flapsi Sentenable Wieg Panels 128 Wingspan 82 Overall Length 2180 sq Wing Aeon Onetbird Snale 113 SCALE MONOCOUPE fAA True 1930s Classic Full Scale Monocoupes huilrbetwenn tg27 lgqgaod establishnd speed recods lot its $0 HP class Model has removahin all-balsa wing panels Fuselage halsal plywood constuctinn Engine unit easily ramocable Landing gear shockmountnd Fihergiass wheel pants eogine cowl fairings ae readily available PLAN No RC354 ill Ettiegn Paseding Mnenbe AMA NFFS Hall Feerer Prices complain clans cue asntrcbly & derailno parts lists PLEASE ADD a2 80 tar shipping lerailieg tubal t99t Plan Sets crucycro $1 00 Irelundahln first orderil WE TECHNICAL SERVICES Rt 1 a- onna D. Bnnch F137A1Q February 1991 179

Built competition AMA Rubber Scale class small version Jim Bedes BD-4 homebuilt has flown well designer Don De Loach youve got little modeling experience dont feel quite ready big time Rubber Scale version Jim Bedes BD-4 home-built may just ticket EDon DeLoach THE YEARS after Second World War doubt time rediscov ery late Forties early Fifties saw rebirth old American classics war dampened Aviation too enjoyed rebirth time people flying ever before catching new aviation craze homebuilts Homebuilts homebuilders havent changed much since years found ing Experimental Aircraft Associa tion EAA now governing body homebuilders sport aviation enthusiasts US gave aspiring designers builders firm footing start such designer Jim Bede Bede hit homebuilt scene early Sixties sport aviation state extreme growth prosperity Bede set out late 1967 design entirely new airplane hoped would surpass others aspect performance wanted first off economical ship both construction cost operation Furthermore Bede turned off draggy-old-crate designs small slow wanted design classy airplane wouldnt look like just old homebuilt resulting airplane everything expectedand Dubbed New Gen eration Homebuilt four-place BD-4 homebuilders dream Construction simple clean bolt-together steel tube structure lightweight ply wood covering maximum streamlining 60 Model Aviation Tricycle landing gear upswept wing tips racy lines make eye-catching model Designer/builder Don De Loach has won some handsome trophies using nicely crafted lightweight rubber-powered craft Full-Size Plans Available. See Page 188 REFERENCES PEANUTS PISTACHIOS Vol Iv BY WC HANNAN 1989 2 AIS.PROGRRESBE3S 6/70 8 0/70 3AIRCRAF[ BY DAVID MONDEY 973 4 NATIONAL AERONAUTICS SPRING 1971 SOFT BALSA W\ PROTOTYPE 60-4 WAS GLOSSY WHITE WITH RED TRIM AND RED N624BD ON FUSELAGE MAKE SPINNER FROM MEDIUM BALSA SPIN ON DREMEL OR MEDIUM BALSAVACU-FORM BLOCK HOLLOWED OUT TO 3/32 THIN ACETATE WINDSHIELD WINDOWS GLUED ON INSIDE FOR REALISM7 J/r M/r 50 LIGHT VERY HARD I/B X 1/16 NOTE BEST MOTOR TO DATE HAS BEEN FAI TAN 3D LOOI STRIPPED TO 116 WIDE MAX WINDS 2150 BEST TIME INDOORS AT USIC TO DATE 90 SEC CONTEST RECORD 3rd PLACE 1990 AMA NATIONALS/ USIC INDOORS 1st PLACE 1990 PLANESMEN REGIONAL CHAMPIONSHIPS FORT WORTH TEXAS OUTDOORS SUMMEE ALE OUTLINE PROTOTYPE WT 16 GRAMS VERY HARD 16-ID 1/16 SOUARE PROP DIAMETER 6 PITCH 9 MAKE FROM MEDIUM BALSAHELICAL PITCH SPAR FROM MEDIUM 1/16 SHEET 1625 HIGH LATERAL CO AT SPAR 5-7 DOWNTHRUST 2 2-Y RIGHT THRUST 3 TAPE RUDDER TABRIGHT 3/16 4 1/16 UP ELEVATOR COVER MODEL WITH WHITE JAPANESE TIS SUE USE NITRATE DOPE FOR ADHESION -1/16 SHT GUSSETS/64 PLY BACKPLATEFIN FROM MEDIUMLIGHT 1/16 SQ 3/16 SHTHARD AIRFOIL- FB 37-ID MAKE 1/32 MW MEDIUM 1/16 50 HOOK- LATE FROM 1/32 PLY THROUGHOUT/ ///// I/32SHT 3/35 OD ALUM- 1/16 SHT VERY HARD 1/16 BR ACESSO LONGERONS IiAIRFOIL ED //WHEELS FROM LIGHT /LMAKE FROM PAPERBALSA SPUN ON /AND EPOXYDREMEL 037 MW 1ii SHEET ELEVATOR HINGE ELEVATOR WITH THIN ALUMINUM FROM 12 OZ CAN USE WAPIF PN ROL OUTLINES MODEL AVIATION 969 BEDE BD-4 61/2 SPAN RUBBER 6ALE NPOWERED SCALE MODEL LUDESlGNEDYAA.g 013456 INKED 20 AUGUST 990 wing cantilevered rarity small homebuilts zero dihedral specially designed airfoil BD-4 could built plans factory kit complete 150horsepower Lycoming engine $5920 finally Bede added professional touch tricycle landing gear option trike BD-4 looks like high-class exec utive speedster retrospect BD-4 accomplished everything intended mid-Seventies 500 planes built plans kits streaming daily Bode factory day still quite few flying new built once advent composite construction has caused designers including Jim Bede change ideas favor newer advances Nevertheless BD-4 survives today whether full scale Rubber Scale form design BD-4 Rubber Scale no means first As early 1971 FF Scale community already heard airplane designed very good model versions Among plans Bill Hannans Peanut version probably models built today full-scale BD-4s case BD-4s pretty lines excellent propor tions impetus design airplane presented CONSTRUCTION model de signed specifically novice builder mind although covering model Continued page 176 Wheels balsa blocks turned lathe perhaps Dremel tool Note hole nose block propeller thrust button access rubber motor winding aid protection wInding tube Nose gear wire laced onto wide fuselage crosspiece thread coated glue February 1991 61 structure simple easy build yet successful model requires careful attention selection balsa having correct grain weIght plus painstaking craftsmanship PROPELLER SAFETY MESSAGE safety precautions designed enhance enjoyment model flying should part modelers routine both flying site workshop 1 Select correct propeller size following engine manufacutrers recommendations 2 Before using plastic props remove flash along edges propeller scraping pocket knife 3 Install propeller using correct nut washer airfoil side forward securely tighten Recheck after flight 4 Use chicken stick electric starter start engine make adjustments behind engine 5 Keep spectators least 20 feet away out path rotating propeller 6 Wear safety glasses hand protection operating model engines permit objects touch turning propeller Remain clear propeller arc 7 To stop engine cut off fuel supply accordance manufacturers instruc tions case DO NOT stop propeller hand other object 8 Inspect propeller after flight Discard propeller has nicks scratches other visible defect DO NOT repair alter orin way modify propeller 9 We strongly suggest propeller tips painted order increase visibility turning rotating propeller can cause serious personal injury FOLLOW THESE INSTRUCTIONS CAREFULLY WINDSOR PROPELLER CO 3219 Manier Cr Rancho Cordova CA 95742 should adjusted about 25k ohms about center position connected shown encoder wiring sketch switch unit will provide on/off operation channel keep within its prescribed time period Once entire system set up find single servo noisy buzzes jitters recheck input device settings okay check whether servo properly centered isnt refer manufacturers instructions adjust servos centering Next month Ill conclude discussion overall system connections insulated lines wir ing planes battery supply way sulating line clips Heres listing Ace R/C parts used portion project digital proportional RX decoder #12G15C $1895 plastic decoder box #PLA2Ol $2 Deans connectors three-pin sets @ $175 per set and/or three-pin Deans con nector block #19K22 two Bantam servos #14G26B $2645 Approximate cost decoder assembly two channels $85 $90 including miscellaneous wire solder batteries Please send ideas notice upcoming CL Scale events contest reports especially photos CL Scale activity address very top column cremental control Before can adjust con trols must understand something about movement affects particular channel encoder input encoder capable seven-channel opera tion purposes explanation tets assume seven channels will made operational achieve creating channel-tochannel interference encoder must able read control channel independently sequentially Lets imagine time line channels has predetermined space equivalent time two milliseconds ins Lets further imagine during specific portion 2-ms time period channel operationat sensi tive input control movement operational time period can defined 15-ms point 05 ins overall time per channel objective control vary through use input devices voltage input channel during its operational period two devices using switch AUX/LEVER allow us control channels two modes switch unit instantaneously shortens lengthens op erational time period 15-ms point 1-ms 2-ms point on/off-type control channel other hand AUX/LEVER variable resistor allows us control channel continuous incremental manner between 1-ms 2-ms points its operational time period properly adjusted AUX/LEVER unit 5000-ohm 5k variable resistor will al low us continuously control channel ad just unit put lever its center position measure resistance center termi nal outside terminals ohmmeter should measure about 25k ohms either side side gives higher reading other adjust turn U-shaped device back unit until both sides measure about 25k ohms now move lever side other resistance reading center ter minal outside terminal should have range about about 15k ohms connected encoder resistance range will keep varia tion input voltage range permits contin uous operation channel well within 1ms 2-ms time period input voltage ex ceeded range making channel operational longer 2ms possible spillover other channels time period could cause loss synchronization encoder As result ser vos connected system could become noisy jitter possibly run free switch input unit has two 5k-ohm trim pots BD-4/De Loach Continued page 61 sufficiently challenging task preclude rec ommending first model fact BD-4 boxy anyway makes natu rally easy build Further has scaled directly Bill Hannans threeview can sure true Scale model can competitive contest indoors out Begin construction building two identical fuselage sides directly over plan Beginners Remember layer plan Saran Wrap wax paper first prevent glue sticking structure plan important choose glue wisely almost models con struction lightest strongest selec tion has given great success Tite bond Elmers wood glue though Am broid Duco would probably job oft THE FIRST PRECISION-ENGINEERED ENGINE MOUNT e THAT PROVIDES VIBRATION-DAMPING SOFT MOUNTING uSA IViounI WITHOUT EXCESSIVE ENGINE SHAKE AT ~M e n very soft mounting excessive engine shake low RPM due damped nonlinear force-displacement characteristics mounting system vibration mounts loaded compression shear Thwat forces cant causetensiOn failures constructed aluminum oil resistant tomer Safety featureunique mount design captures engins airframe ught weighte55 standard aluminum hard mount Allows lighter front end construction Radial beam mounts available 40-65 7011 12-18 cu sizes hardware complete installation instructions included 60-day norisk money-back guarantee direct orders Radial Meant21Y5 23Y4055 zepI,ewo 701155524w 7011 ize 52555121 5 size 52505 121SSZO 53155 oflware10319 Pine Pass Drive Houston TX ssociates Viso MsslerCard COD ac55pted Dwtor isqoirse ovtcwsr 01 Asoorn15e 176 Model Aviation b lln just well sides diy pull off plan make horizontal crosspieces point can either join fuse lage sides together air greater accuracy build structure over plan latter difficult time-consuming finished fuselage will stronger straighter feel combination two methods best whatever youre used Theres no right way Next select medium hard block balsa make cowl first step cut sand outside shape perfectly shaped ready glue hollow out inside A-in wall best way to use spherical stone tip Dremel tool Before glue cowl find cen ter cut square nose block matches size plan diameter winding tube Now bend front back landing gear wires music wire main gear wire standard %2 nose gear wire since prone bend easily during hard land ing ask know should made 037 wires bent glue onto respective cross braces tak ing care well aligned level fuselage may now set aside cov ering Begin work wing cutting ribs medium A2-in balsa best way balsa stripper rib stripper using plywood template guide However may freehand careful Make ribs /6-in high Build wing over plan same way fuselage sides built first step select carefully wood will used leading trailing edges wood should straight hard very straight-grained Take time select best youve got Pin leading trailing edges onto plan Beginners Never stick pins through balsa strips Doing would weaken Use pins alongside strips align over plan pin pushed building board angle LET WATER FEVER TAKE YOU OVER LANIER RCs SEA BIRD CAT NO 87206 EXPLORE THE ADVANTAGES OF WATER FLYING WITH THIS SUPER INTERMEDIATE TRAINER Fuselage Length 45 Rec Engine Size 40-60 60-80 4 Stroke Flying Weight 5 -6 lbs Wing Span 60 Area 630 sq Radio Channels 4 WRITE TODAY FOR YOUR FREE COLOR CATALOG PC Box 458Oakwood GA 305u6404-532-6401 MADE IN THE USA can used hold balsa strip down against plan begin gluing lightweight A6-square diagonals bot tom Next comes spar made /16 ex actly 1625 high spar must three pieces shown plan until dihedral added after construction very important After spar come ribs Glue carefully making sure aligned adhered well both spar leading trailing edges glue has dried remove outer wing panel miter leading trailing edge inner joints dihedral Finally block up wing tip glue dihe dral % tip making sure wing level perfectly straight glue warp wing drying build stab fin subrudder light dium /16 wood As done building wing leading trailing edges should fairly hard wood rest structure can much lighter wood look stab youll notice Ive included scale adjustable elevator eliminates having move entire stab decalage trim changes Hinge eleva tor soft aluminum sheet shown plan Another note stab Ive included scale outline dashed highly rec ommend stick ealarged version first flew prototype small stab hardly flew Im sure possible make model fly small stab ualess superexperienced Id say use big itll save lot headaches Now return wing should dry now carefully remove plan Select two softest lightest pieces balsa have wing tips Glue rough blocks shape theyre place Carefully cut sand wood until have flush rest wing Also note tips upswept ie curled upwards efficiency measures Bede emFebruary 1991 177 DIGC~ES monthly publication covering international RC Soaring Scene mUSk $l9yr$26/yrlstClass In CanadmIMsxIco $26/yr US funds Asia & PacIfIc $42/yr US funds Europe & UK $36/yr US fund Surface IhH ForeIgn $22/yr US funds R/C SOARING DIGEST PO Box 6660 Concord CA 94524 9 HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 CAL 415 783-4868 Out CAL 800 482-8663 L WWEre proud announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT TATONE PRODUCTS CORP Thank wonderful year THE ZAP GANG FTE ROBART HOUSE OF BALSA PACER TECHNOLOGY ployed BD-4 speciallydesigned wing tip still used extensively day significantly reduces aerodynamic tip loss Take time get shape right will enhance wing aerodynamically finished wing looks better normal tips 0 After youve given components careful sanding its time cover course best covering use type model Japanese tissue adhering tissue use nitrate dope though buty rate would probably work just well Covering like almost other aspect model building highly individual suggestion can give work slowly carefully time run trouble cov ering try rush Dont try cover model size day usu ally takes three four days pro perly take time will have learned value patience because finished product will look better ever expected simplest terms covering applied panel time bottom wing panel top left fuselage side right etc surfaces have covered time shrink tissue water al cohol Take step back listen cause point almost everyone has ruined otherwise good model cul prit course dampening itself often leads terrible warps seg ment model may safely soaked fuselage never warps Pay careful attention wing espe cially empennage recommend light misting alcohol airbrush dont have airbrush apply care fully fingers cases either practices will work warp ing wing Next come stab rudder Ive gotten such bad results Ive tried shrink surfaces now usually dont try have airbrush youd like try some shrinkage go ahead dont surprised surfaces end up looking like prop blades youre done Again aspect hobby no has figured out just what works Some builders pre-shrink tissue before covering surface As far finish tissue con cerned two coats thinned least 50/50 plasticized nitrate dope works well point also need decide whether want paint model As can seen photos BD-4 painted airbrushed colored butyrate unless practiced dont recommend does add weight painting extremely time-consuming plan setting aside extra week two plan paint model An alternative painting use strips colored tissue doped top basic covering 0 finished covering finishing model work some scale fea tures details before assembly important windows windshield Both put inside unlike FF Scale ships accomplish cut out tissue top fuselage wing glued youll have space Antiques Military Civiliarl Helicopters Sailpianes 3000 P&JS10000 3-siew a0a0gS co4or FOTOPAAXSInctedng KOKUFAN ** * r ** ** ** * * Custom Graphics rate model stars circles triangles club logos scale manufacturers insignia . name tl Peel stick remove masking its done AMP Graphics prespaced alignment assured costs littlel Try us AMA number combination 10 letters K numbers computer cut 2 high Iblack whitel ppd introductory price $295 . printed information send $100 p&h K dont delay inquire now have information need iti Call write todayK 4AMP Inc Graphics Dept MA PO Box 7934c DeerParkNY11729 516 595-2849 NYS Ftesidents add aelos tax4 178 Model Aviation LATHES MILLS METALS AOOKS -___PRECISION INSTRUMENTS COMPLETE CATALOG $200 000em *iL &44AIP1ELL DDLS Ce COMPAC 5 re-fuel engine between flights doesnt make UEIIOli sense re-fuel radio system flight batteries ANSWERi YOU BET IT DOES run out fuel land dead stick no problem run out radio well know rest story IR NA Tp EI RD FC LH IA GR HG TE BP1 RAPID CHARGE AAR PACK -$1895 FC1 R-1 CHARGER & CYCLER -$5995 INTRODUCTORY COMBO PRICE -$6995 Tel408 778-4832 brochure Shipping handling $300 CA Residents add 725% TAX Airborne Electronic Systems 16055 Caputo Drive #D Morgan Hill CA 95037 Serious Horsepower1 0S ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shadel Performance Specialties i2i i11 &i yJImJj bJi Available YS Long & Short Stroke 05 Long Stroke 05 6IFSR 06 40 VRP/VF 0S 91 VRDF STX-40 Rossi 40 coming soon information Call 619] 729-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 Send $1 D0for fully illustrated catalog work Now must some real brain surgery get windows place must cut very precise size adhered Ambroid RIC 56 Take time best job possible realistic effect will achieve will well worth effort Several other details should completed before assembly Mark control surfaces panel lines fine permanent marker such fine Sharpie spinner wheels should spun light balsa Dremel tool Hollow out spinner attach nose block assembly Both prop nose block fitted bushings bearings made A6-in OD aluminum tubing prop shaft %2 music wire final step add cowl intake landing gear fairings Now thats left putting tog ether Again best glue use slow-drying wood glue Glue surfaces together making absolutely sure aligned level let finished model dry overnight THE RUBBER MOTOR estimate motor required models built plan will between /8 /32 wide depending models weight best motor far has very long motor 30 116 wide However model also fairly heavy 17 grams youre about 13 grams %2 ought Conversely model 19 20 grams will probably require somewhere around / case install motor thats fairly close figures go out field test flights INITIAL FLIGHTS center-ofgravity approximately have plan make short test glides until model settles nice floating descent will probably have add small amount Up elevator did least bit nose weight model gliding consistently begin making short powered flights motor wound 100-200 turns BD-4 actually easy trim figured still going well fairly short pe riod time its its best model really per forms indoors out got 80 seconds USIC model still new finely tuned its re cent outing contest fall year achieved two consecutive maxes flights first being over four minutes ROG Thats riseoff-ground takeoffEd case model 14 15 grams will easily able 90 100 seconds indoors out doors Well watch out thermals Good luck good flying D responding advertisers mention read about Model Aviation FF Scale/Warner Continued page 63 will control tissue shrinkage applied dilute form Peter sends along Englishlanguage brochure Otsuka Pharmaceuti cal Co lists whats descending order have sugar polydex trose water-soluble dietary fiber vitamin C citric acid sodium citrate extract guarana nat ural caffeines monosodium glutamate fla voring Doesnt sound too appealing health nuts what MSG sugars tis sue trimmers may just thing Now have experiment some native products see ingredients does job combination Thanks Peter Hetherington Mosquito Old-timers will re member P F Norman British violin-maker models built order Centur ion tank Mike Hetherington contemporary P F has taken just opposite path has come up Killer Mosquito Mik Mikkelson just back Tight Little Island won Earl Stahl event Spitfire reports Hetheringtons Mossie must seen believed Weighing about six ounces model fea tures Tomy-timer-operated retracts rubber band assisted picks up gear takeoff two rubber motors nacelle geared front pre-stressed bulkheads made / x /32 sheet wrapped around foam core wrapped another /32 sheet model done yellow tissue scale Bill El finger * Says Oniy Plan rt Patten05 Sets giveQuarter Scale WW assoted designs want have selected best classic designsSE-5A tiete choose patterns partanan important80% wing span sq exclusive teatuewing atea 2 engines Curtlss HAWK PlCRCOS7 8249810 94% seingspae eegebSPAD CXIII 2268eqinwitgaea Pad 3to 7$Ywingtpan2125s0 23 ctD eegiees aceel Sic ing aea t 3 31 engines RCQS-t4 5 Capable flynt capturee Curtiss FALCON O-IB/A3 114 wiegspae aegnh COS 8$2795 3l805giewiegaeeaFor23 aPOKKER DR-i TRIPLANE 38 CtD cegiecs aeeel Scf%1~J~ pan 2 sq SCOS13 8w 8to 1bO enaines RCQS-882495 One-Third Scale Piper Tn-Pacer PA-22 SOPWITH CAME t18315 wisanene 2358 sq in.80 wing epa wies neon 28 te 3a old segiseswing area oe 45 oh SIC nn t2 lbs waod 9 balsa Bttla noeell lnegthOSsq ft dra 8C3g3$2995RCQS1 83g old enginellCoss -824 1/3 Scale Piper Cub J3Pokker DV tt5 noes span Ag Isegeir 80 wingspan .2gg8sso wiegetee 4nhRIC gg25vid 8C38282998 Far 28 ta 38 ClO Engines Weighs appens 14 lbs liens 5/Cl Far 45 Chaeeal sic Clark 0 Plan Bettantl Aletnil lerieb Flapsi Sentenable Wieg Panels 128 Wingspan 82 Overall Length 2180 sq Wing Aeon Onetbird Snale 113 SCALE MONOCOUPE fAA True 1930s Classic Full Scale Monocoupes huilrbetwenn tg27 lgqgaod establishnd speed recods lot its $0 HP class Model has removahin all-balsa wing panels Fuselage halsal plywood constuctinn Engine unit easily ramocable Landing gear shockmountnd Fihergiass wheel pants eogine cowl fairings ae readily available PLAN No RC354 ill Ettiegn Paseding Mnenbe AMA NFFS Hall Feerer Prices complain clans cue asntrcbly & derailno parts lists PLEASE ADD a2 80 tar shipping lerailieg tubal t99t Plan Sets crucycro $1 00 Irelundahln first orderil WE TECHNICAL SERVICES Rt 1 a- onna D. Bnnch F137A1Q February 1991 179