Heron

NO OCR TEXT Lord knows designs author has practically modeling mag azines Thirties until present day electric power RC pleases him thats saying something U Bill Winter THIS GRACEFUL BIRD significantly advances aspects performance far beyond family sport models typified LeCrate popular because flies nicely Heron blends sport competition performance incorporating unusual features definitely first attempt aircraft recommended anyone does already possess adequate piloting skills prior Electric experience Heron makes flights 15 minutes reliably slow floating some times breaks 20 minutes cool highdensity evening air can attain extreme altitudeto point fliers chicken outtwo three times flight will go winch-tow heights four seven times flight depending flown variables shutdowns climbs has done 15 touch-and-goes followed climb altitudethen soar ing 10 minutesthen resuming half dozen touch-and-goes faster typical Electric sport machines grooves solid feel under power gliding peak results must handled smoothly gentle tooling stick never heavy-handed controls hands-off stable instant launch lift/drag ratio LID truly ex traordinary Landing approaches must far out low down waist high across field will knee high goes past far end landing area its first test flight Don Srull needed four attempts get ground finally landing extreme nose-high condi tionslowed maximum Doug Pratt tried overshot three go-rounds elected slow ap proach fair head wind finally got ground extreme far end strip large enough incidentally Pat tern models Doug first broke glide gently short runway Heron remained head high slow flight past runways end Temperature air density play obvious part performance Marglnal heavier Electric planes capable 10 minutes may go higher 50 75 feet 900 day high humidity low barometer Average models lose minute two may much two-minute loss Herrons 15- 20-minute capability same time let add unrealistic say Electric will exactly geo graphic atmospheric conditions serious factors John Worth took Heron An nual Electric Fly Hatfield PA best pilots invited fly Keith Shaw did touch-and-goes March 1987 29 see Heron gliding looks will overshoot normal landing area Plc taken during series flybys Tom Schmitts camera Bill Winter draws air foils French curve zip-zips old FFers call says Eppler 205 quite similar Herons adds no open-frame wing can maintain intended airfoil Photos author Tom Schmiff Cllmbout steady launch angle model fully hands-off stable good flight anything over 15 minin fact anything less rare Effective flight tactics some time produce flights 20 mm six seven descents returns soaring height plus soaring thought its secret wingand first time seen extension shaft arrangement perform effectively Bob Kopski did touch-and-goes after interval flying did another series touch-andgoes Woody Blanchard once AMA Na tional Champion turned teary-eyed alti tude hand over controls Worth bring down Both Blanchard Heinz Koerner until year conducted Electric clinics during event later contacted say should have entered Last Down event because felt would have placed Unfortunately Worth under ders did transmitter used two other airplanes well less hours capacity remained Heron also has flown Hurst Bowers Tom Schmitt dont have take word Remember true competition machine Spectator reaction Hatfield marked surprise equipment Left Long rounded-off nose allowsthe big Robbe 15-12 banana-bladed folderto hug contours position thus avoiding need 0 prop stop brake Landing gear made quick detachment still greater performance Winter hasnt bothered gear off assuming high-climbing shorter-run setup ought push competition stuff Right Economical stock Robbe/Mabuchi 33-to-i gearbox draws 16 amps 15-12 prop whereas competition 05 draws 35 amps same propand seven cells Herons eight On/off motor switch requires use Robbe 0-ringed universal must use motorspeed controllerwith big prop huge prop disc area respectable rpm yields Impressive power Seemingly botched firewall other trial installations Left open natcn reveals airborne battery pack rubberbanded underside balsa traywhich carries Its top ruaaer elevator servos receiver Note strap-on gear close fit folded prop blade An arming switch essential Electrics avoid mishaps Right Entire upper nose lifts off hatch allow motor access removal Again Robbe universal shows clearly 30 Model Aviation i-or 1gm-call 1 Electric machine weighing 43 oz craft looks surprisingly large so-called 05 motor span 5V2 ft tapered outer wing panels also thickness-tapered down top visual effect gull wing some attitudes ,1gGN ay BILL WINTER 3/16 SO 3/16X3a v i5 I/8X3/8 MED 3/32X&16MED -1/16 SHEET ON lOP B BOTTOM N SHEET \ ROBSE ROBSE/MABUICH 075 31-I MOlOR I/8X3/16 SQ x l/8X3/16 LONGE RON S 3/16 SO L I/8X3/16 3/16 SO /8 SQ TOP SPAR N MEDIUM N ALL RIBS HARD 1/16 SHEET HARD BALSA 3/16X3/a MED 3/16XI/4 -y II 47 1/8SQ HARD 3/32 PLANKING BOTrOM B TOP 1/2 OZ GLASS CLOTHI/IS PLY CORE THINNED EPOXY 7 I/8Xi/4 SPRUCE SPARS TOP BOTTOM N N N /4 X 3/8 BALSA MEDIUM -46 N 7 entirely stock cheapie motor Robbe/Mabuchi uses run-of-the-mill Mabuchi has special winding suspect true also Graupner/Mabuchi new Mabuchi Polks has showingand pos sibly motor Goldberg has new Electric Gentle Lady combo 31to-i Robbe gearbox Robbes 15-12 banana-bladed folder eight 12 Ah cells draws 16 amps ground perhaps unloads much 12 amps flight roughly 60% drain similar-looking Mabuchi motors am inventor innovator Cu rious about forms aircraft dont develop design through repetitive building revisions along way draw upon vast fund others experiences through magazines combine things impress recipe objective Heron near top Electric food chain begin Don Srulls development popular Sparky scaled up old Lidgard Rubber model kitted Comet fascinated bent thinking concept slow-gliding LeCrate After several years watching spiring work giant folding props high reduction ratios produced phe nomenal climbs durations could see exciting flier capable 15 minutes Don arrived night copies MAN Model Builder containing re spectively Bob Bouchers Astro Challenger Larry Jollys Electricus both epitome competition craft Using formula developed predicts duration Rubber models Electrics spooky precision two-sheet prospectus pinpointed specs performance goalweight area prop motor batteries nocent remark made could fun locate motor front cabin bulk head longer extension considered decided would combine features ultra-performance competition mod els what passes sport modelmy LeCrate instance Jolly states mod el goes up out sight direct-drive 05 Astro 05 XL Leisure racing type Rev-Up 7-4or 7-6 seven cells six 12 Ah cells 4 minutes run Boucher uses seven 800 mAb cells geared Astro Cobalt small Geist folder still big prop model can climb straight up Both use Eppler 205 airfoil flat-bottomed long Phillips entry extending back roughly spar own zip-zip airfoil used glow-engined Krackerjac about 1960 close relative Herrons airfoil somewhat similar Astro Challenger built like featheressential its climb scale 10 being sport 10 explosive shot five seven kept low cabin profile realism well full-fledged landing gear Though exciting climb rate angle would somewhat less comparable dura tion virtue repeated climbs glides requires still different propulsion system combination final system weighed five ounces Jollys gross 35 40 oz fixed gear detaches wish considerably boosts performance its gross 43 46 oz Jollys Electricus spans 74 area 582 sq Srulls figures recommended maximum 600 sq for42oz aloadinginthe 10to 12-oz range payload 30 oz structure mere 12 oz based seven cells Astro belt drive 15-in folder Span would 70 started outlines decided go down 65 span 545 sq area wanted bit faster flight pleasure settled eight 12 Ah cells 311 geared Robbe/Mabuchi 075more gross higher loading results speak themselves no doubt possible experienced Electric flier get machine different motor/bat tery/prop combinations iron band confines enhances magnetic field Robbe/Mabuchi optimum results Robbes 15-12 prop understand Sold Robbe direct drive same motor does have band Another manufacturer tells production-run motors have vari ation performance 10% 15% Like cars could get relative lemon careful selection can find blazer Mine however merely off shelf Authors note explanation iron band vague motor passed around among several modelers before installed Heron now have seen Robbe directions know special winds sumed band enhanced motors performance installation 16 amps eight cells recommend too nominal 05 size what size really Robbe/Mabuchis ability take up 10 cells phenomenal Ob viously motors rating higher standard Robbe says remove band using eight cells less cells band reduces drain avoid overheating Good air cooling seems neces sary note triangular opening windscreen immediately forward motor Good exit venting recommended Robbe prefer keep band eight cells motor run time 16 amps anti-suppression capacitors Robbe accessory dont come motor think Robbe would well include because absolutely essential Gear ratios make tremendous differ ence current drain certain 05 11-6 prop ratios 21 21 turns 5500 21 24 amps 31 12 amps 5000 21 drew 17 amps 5200 Herons performance superb may better may worse Thats nature Electric beast -4 K BASSETS 2 H-4 IVIBBEERTO*TOOTTRM1 AAAEWEBBAEESTCOAOABER TO OWlS4SLW WPA0 LEBBIWA rOAR VXAAE CR00 BALSA Ill IOCR OCTET BRLOR Uf ARBTEOBATOAR*EIOASESOCCTj 0 RBALBBERAITTWCMLI TROSIOR 4z IROBES JOIVERSA Li WABA JJWA CUSP TLAARIOEA BOTTOMATE PLO~ B TAPCAWARETAWeR4AR ftCTOT IIISRRESW ZI SOAR LAREOEROOESBA CABBO CUOZOTETO BEE TEL C CRA4URT Mabuchi motor years Astro continued carry Mabuchi type desig nated 05 six cells 075 seven cells seems efficient though hot motor extremely wide variation aircraft types consider 075 Robbe unit use 311 Reduction gear box motor bat tery pack has eight cells 12 Ah prop 149-in-dia Robbe folder banana blade configuration Ive told everyone except Srull big folders way go High drain battery big reason Ted Davey duplicated arrangement assist reported 28-amp drain Inci dentally Graupners big Sailplaneat Hobby Lobbyuses 10 cells motor big folder cannot com 32 Model Aviation Full-Size Plans Available. See Page 170 TNAILISAEOSNTCSAOFCASHAOO BALSA TO IS GAS SET SOFT SOASASOAT 2222if3567 8 STEEr P1 PEORT IASSA NATO - SPOUSES PANEL TAPERS ALTER PASEL5/ASAICS —EC/ASSNEET II *INA ESLIELTELACEN NOTE 3/32 _________________________________________________WASH OUT AT _______________________________________ 7 SSINHICSSOFT SCIAS PINEETC\\__ INLEOATOR-t/2As-- SOAASCASSOFT SE SSSTRSLLEEISEESO5CE 05/N SLESISROS SEESS lAIN IASSNESLESISEOO _________ -I SCARS -EANEN/MARUISHI I/SPT TAN SAT[SERSO TA 0 SASS PUSHESSSCESS/N___________ STESIIMSTSESTUPPEATSI IISASEANSI SERSOSENI INSASNET IEUSOSETRASEL NSTTHUCSESERRLSCE ISASSAPTI--/Ati/ 55 SLTHETN[HCHASPTFSEARSTTSNELATEHSONSOSESANf I I SLOPE 0P5C555 WNSSSHIRLS I SISESIASSATPSNSTSPR~4SCOASNOENTII E/SSNSLSSPLATEOASSTSTSTNNSTTESELSCESEN lASSESSNSEANMPOICHSSCRUEO SISEFN ANPLTMOSSES ALALAT ONE.H/SASAASAISSTPEONT LAMINATES WITH SCSASHEETO/-SOONER 5.A ASNOLTSELSCRS ASCIN ISMOU50N SOTOSSOT PLANERS3AASAH/EANOSOFT CNASASISO5/IC-SFEAR H7TTOP TN NIl MASON___NLISOSATOIIELSA TEASEL NTCAEISALCESSSS3rSNTCE CHAISE ETCT SOON i5/35p SON SES SINE SINSSCOSA OAFSOTNIPHISSEI/IITS MAO _____ S/lANANo~o- IA- SCIASSOPT 4AIPSETA flOWN IASELS-V. NJ\ POSSE SON PATTPEUASST SeC/P NSA AU SEISISISATASAENOTOS ASTLINE SPILT NS AM OS ESFOE. NSPST -3/SASOPE/\3f-~CANFLT ECTANo~FO.I7nSTE SINS LASAIN RAE-I/NGESH[//NYSPAS lESSON10HOLEII-ICSAWESESSESPSE STROISGE1II 1T SALI/J/II I OOSEEOTITT0o/7 CP ASUSAS IIQf SEAR ELOSE1 SOS ERASE TUNE REATOS1SCSLF7 SLATS WRAP OSEECISELTU/NELl CAIN LATTALASS5 -Li CASOP 2 SIGN Yt/f\OfC S SCHASSOESSIMSPRSOS--I MOUNT PLATE I SEESO TAPE2 SCHASHEET41 NOSE 1550___________-SESIONPO S SHAWN SO BILL WINTER SPANSTINS AHEAEOH GOING LENSTTAE 5/lOINS PSWSHSONNS/MASUISTI 075 31155155 115SF SANS S/ NA 55 TN AT NAP SONS SINSHNETAASSSTsWEIOTT05 OZO WITH 5 12 SELLS SHOP HOBBS lOP 010 FOLSES SEES TEASING NI HERR SLAEEI IS/SN STASES LGTSS5551155 3 pare 05 geared cobalt seven cells apples oranges Bob Sliff men tions did try same Robbe prop tests because drain im possible 35 amps drain 16 amps Robbes catalog claims 16 ampspeak motor battery does overheat cannot flight-test continuous run because plane would reach roughly 4000 feet judging adding six seven climbs 700-ft winch tow height inconsistency Srull points out Robbe designed prop specifically version Mabuchi motor came iron band same Robbe/Mabuchi geared motors time donEt have fuse setup dont know loss fuse significant doubt winding special Mabuchi makes enormous number motors types including industrial ones cannot procure relatively small run motors modified small companyNs requirements perhaps folks like Graupner Robbe may able order sufficient quantities obtain vari ations However speculate purchased Robbe/Mabuchi gear box price about $3600 Motor location motor-in-cabin place ment paid unanticipated dividends location equipment close center gravity CG resulted superior handling characteristics no masses acting through long moment arms mass concentratedF example rudder response effective acci dentally putting trim extreme applying right rudder convinced catastrophic radio failure resulted terminal-velocity dive did prove thin wing will stand up thing On/off speed controller motor speed controller highiy desirable big folder eight cells simple on/off switch will tear things pieces wanted on/off provide using Robbe Universal two sturdy 0-rings absorb start-up shock universal dont recommend gear ratios less 311 setup lower ratiosF universal will fail have no problems controller will allow slowly accelerate prop way fly March 1987 33 Heron does require controller cruising flight wish use motor speed controller go ahead install However note prototype Heron never requires extended approach drag-in landing controller would useless particular plane Wing low drag higher speeds climb used airfoil 10% thickness own zip-zip section Theres turbulator spar anti-warp spar Main spars n spruce webs between Webs extending extreme top bottom spars would add weight equivalent four strips wood webs therefore between spars elected sweep back leading edge rather long tip panel flight results Ijudge efficient outer panel thickness tapers accord tapered planform tip panel entire wing panel root rib out built flat board sweep-back resulting false appearance gull wing flight sure looks like gull wing plus blue wing stilty landing gear led models name Incidentally used Super MonoKote covering some weight saving possible using Micafilm After covering wing 3/33 washout should incorporated tip first Without washout plane slowed near stall force landing left wing tip would drop second before wheels harmless pretty Washout corrected increased models speed climb considerably latch-on wing mounting two 2-in nylon bolts trailing edge extremely light provides four-point support /33 ply hooks slide under top cabin crosspiece short wing rib doubler of3A2 balsa glues inside center section root rib hook goes against doubler shown plans fill pieces added fore aft another rectangular piece glues fill pieces hook Details plans Should wish add wing incidence no 44 inpossibly /32 inif CG rigging accurate file edge hook goes under cabin crosspiece add shim top cabin crosspiece Dont overlook 4 ply tabs glued bottom crosspiece end provide nonwear surface hook press against Authors note Everywhere plane has flown have subsequently found experienced kibitzers hold bull ses sion analyze wing invariably agree wing what makes model fly well wing however must point out two sharp-edged spars top main turbulator sheet ing numerous relatively flat panels result instead usual sag Also structure find tiny MonoKoted panels sags about 1/16 Some kibitzers feel extralong front-tapered tip does something consensus Herons wing perfect arent sure whyand shouldnt changed say What coefficient Luck Factor Stabilizer thin lifting airfoil section used thickness tapering towardthe tips like on-the-step kind flight stab helps produce Also permits rearward CG stab carries part load felt precautionary concentrating weights close CG used consequence fair amount decalage angular difference between wing stab would excessive flat-sectioned non-lifting tail Note zero lift angle Clark Y airfoil minus 40 might wonder choice consistent purpose thin wing 34 Model Aviation Winter swears Herons first test flight hands-off perfect controls Hurst Bowers face says Winter L SrulI R observing critically boiler room Due iron band HObDO/MaDUOflI mounts Astro 15 mount turned around balsa wrap fora snug fit Robbe recommendathe iron band using nine 10 cells reduce drain Winter uses itwith eightcells because didntwant morethan 1 6-ampdrawwith 15-12 prop becausethatwould reducethe motorrun time Whatever effective setting shownthe plan allows 44-in positive incidence shim added Climb glide overall duration improved slight adjustment combination appears minimize required trim range between full power gliding also aligns fuselage closely angle glide path improving L/D prefer have thrust line parallel fuselage centerline rather angled nose latter tends make model nose-up power cut know especially high-wing configu rations Heron will continue straight ahead power cut assuming slightly fast glide angle Hands off climb relatively shallow angle trim lever moved slightly up efficient climb angle airspeed results best glide results same setting slight bit up typical lightplane speed range 38 92 mph has best climb 60 mph Weight Covered MonoKote small mini servos largish Silver 7 seven-channel receiver Astro Cobalt 05 2l belt reduction eight 12 Ah cells model came out extremely light 43 ox belt drive wont stand start-up loads hence change Robbe/Mabuchi 311 gear reduction careful wood selection can hold 45-46 ox Mabuchi motor Examples trailing edge medium hard rock hard Longerons bit hard side medium crosspieces soft side medium Nose planking soft ultra-soft Auxiliary spars med ium/hard Gussets soft tip blocks 1/16 wing ribs bit shy rock hard select balsa tough straight grain Consider piece wood Use instant cyanoacrylate CyA glues course although used Sigs yellow glue planking due sanding ease seating spar webs daylight ap peared separation bottom nose covered -ox glass cloth wellthinned K&B Satin Brushing Epoxy Ap ply coat material lies loosely brush strokes smooth quickly work Finish second thinned coat material sands well fine grit painted bottom nose thinned epoxy Small gaps between planking strips filled easily sanded before covering planking use jury strips ac Fuselage laying out sides note primary longerons cabin bulkhead forward come virtual point nose entire top nose including windshield construction part liftoff hatch held place four small self-tapping screws screws run /32 ply tabs anchored inside top longerons Drill small hole before en gaging screws first time undue pressure applied driving home screws top bottom nose planked %2 strips e tapered beveled necessary fit Begin center both edges fill side planking strip time Some strips may have cut point use straightedge pre-cut hatch portion MonoKoted built place wax paper used easy March 1 987 35 Plywood hooks underside two thin nylon bolts trailing edge provide fourpoint attachment wing center section avoid exterior dowels rubberbands Clean woulani sayY Turbuator spar 15% 0 chord Top bottom spars flat spruce center webbinghas withstood vertical dives pullouts Rear top spar helps control warps Folding prop blades shouldnt swing forward normal path hub allows forward pivot always launch nose slightly up youd better curately hold frame formers hatch erected /32 sq edge strips follow top outline nose shape Recess side 3A2 allow planking thickness bears repeating small /16 ply tabs cemented underside forward cabin crosspieces anchor two wing hold-on latches Also triangular opening windshield hatch centerline provides cooling through holes 3A2 ply cabin motor/bulk head detail shows Davey Systems motor mount can use alter motor location either hori zontal vertical planesas direct drive front bulkhead case compensate moving motor battery pack correct CG location As shown motor cells concentrated two staggered rows four reduce height pack motor mounted front ply bulkhead through will enable remove battery fuselage top thus eliminating bottom hinged hatch Leave large air vent open ing motor mount behind bulkhead because necessary insert motor rear brushes rear Because Robbe/Mabuchi has iron band re quires 15-size Astro mount used balsa shim wrapping tight fit Dont change ply bulkhead outline extend over upright crosspieces flush inside mounting used weak because bulkhead firmly anchored both top bottom saves equiva lent weight /32 x 8-in ply strip essential because models performance rudder post ex actly centerline exactly 900 workbench tip can de-warp fuselage Heat MonoKote twist rear section until alignment perfect Tail surfaces stab center section covered top /16 sheet Two extension pieces fin insert down ward through sheeting shown pieces glue stab spar wood front use Rocket City strip hinges sliced width long strip hinges fit precisely cut X-Acto No 11 blade drop Hot Stuff carefully applied side material meets wood locks solidly Hold work vertically Fold other half hinge out way doing deflect control surfaces work ing place wood destructs before hinges let go no other kind know lighter Surface movements Due effectiveness use long horn rudder conjunction inner hole servo arms Use outer horn holes both elevator rudder Miscellaneous Since ginners airplane step-by-step construction details will provided What need drawn planwhich looks busy Dont use fat wheels Such wheels seri ously reduce aspects performance hate making wheels purple passion Unless can find thin lightweight wheels bite bullet duplicate plan shows laminated wheel thin center ply core facing cores light balsa sheet place grain opposite directions side lightening holes ply can opened up -in drilled holes round coarse rat-tail wood file Glue small ply bearing rectangles side ply Drill bearing holes brass tubing -in ID before completing wheels clamped Dremel hand tool vise using two protective foam blocks turned wheels lathe lightly applying fine-grit paper cutting tool wheels can doped painted bearings epoxied place fly out gear simply remove two hold-on straps sure wheels out line perfect alignment has slight castor toein Always check gear before flying ensure wheels remain mini mum-drag position Performance suffers wheels splayed out trim upset takeoffs may automatic tracking Flying Maximum results depend two things smooth flying techniques avoidance extreme climb angles load prop increase battery drain Any excess controlling overbanking way departing continuous smooth flowing flight costly Controls large enough require slight movements smooth pressure control stick control surface drag thus held minimum second factor may never have heard Lets call LeMay technique cruise management WW II B-29 missions out Guam Saipan Tinian dicey affairsan agony getting back base LeMay tossed out numerous 'essential' weighty objects imposed strict flying techniques minimize fuel consumption beginning will find flight duration over lot number times can climb back up will vary wildlydepending high go close ground descend attitude plane switch power off angle climb use tight loose fly circle diameters etc Air density temperature come play Expect few dozen flights before can perfect LeMay cruise manage ment Without lift assistance may first anything 12 minutes 20 beyond Fifteen minutes good Once technique acquired suit conditions environment time itself will slowly raise performance Motor brushes become seated battery cells perform better find obvious about 50-flight mark use eight cells both Astro AC/DC Robbe deluxe charger latter peak-charges automatically necessary Continued page 38 36 Model Aviation Hatfield Electric Fly John Worth took picture advised groups day wondered about stock equipment Heron year potent cobalts its performance envelope Heron requires good thrust low batterydrain Winter says essential Robbe/Mabuchi use three capacitors shown Robbe directions otherwise catastrophic radio interference likely occur once five 10 flights BUY THIS SET AND SAVE 452b new MicroLus flexible shaft machine power tool youve waiting n have price wont find anywhere else thats just start has features also wont find anywhere else ke handy ctamp-on bench hanger holds both motor handpiece. 38 long heavy duty flexible shaft. slim comfortable BALL-BEARING hsndpiece 3-jaw chuck instead collets quick easy changing bits up /s youre working small theres no ONE tool will much t grind sand polish engrave drill much because youre holding motor hand its much lighter easier use Moto-type toots Has powerful i/is HP 110-120 AC 20000 rpm motor demsnding jobs Order Flexible Shaft Machine Set #50322 today save $48251 Heres what youll get Flexible Shah Machine 38 flex shaft BALL BEARING handpiece capacity 3-jaw chuck clamp-on bench hanger$ 9995 Foot-Operated Rheostat lets vsry Machines speed 10001o20OOORPM 2495 Three Steel Engraving Burrs570 Two Reinforced Cut-Off wheels steel395 Mandrel Cut-Oft Wheels220 Coarse Tungsten Carbide Sanding Band595 Fine Tungsten Carbide Sanding Band595 OrumlMandel Sanding Bands260 apiece High Speed Steel Orill set Is- In895 Total Value$15820 #50322 Complete Flenible Shaft Machine Set includes above SAiIO CAS Sgi 11 t4I charger monitor voltage Anything between 14 16 volts per Cell meas ured under Charge provides good flight Peaking bit higher requires digital voltmeter know fine Otherwise suggest 15 volts per Cell measured under Charge Preflight Display name address must Make ground check before flying session Youll need range believe extremely careful 250 mAh flight pack cycler shows Capacity loss beyond 10% replace pack Never use old pack en counter lift can use up pack flight least remaining capacity isnt enough second long flight Two good flights maximum may wish use somewhat larger pack field charger insurance After Hatfield experience have revised expectations flight time 250 mAh pack Four flights made three extensive use servos Ive asked what servos coincidence happened Airtron ics Three days after event cycled packs found 35 minutes remaining Digipace two-year-old receiver pack 50 minutes Olym pic transmitter 250 mAh pack can stand up hour-plus maneuvering amazes meespecially such time reserve time compared roughly good session four-channel glow model using 450 500 mAh pack Obviously minimal use servos would extend duration Moreover cyclers provide load larger en countered mode Electric flying may wish make hand-glide tests though dont find necessary CG specified possible warps have checked corrected plane will fly Until have made trim adjustments early flights can made partial charges motor battery Just get ship flying nicely before get serious about pushing Check control surface trim settings transmitter before flight misplaced trim may glve unwanted thrill Set elevators trim slight up before first launch correction may needed quickly would touch up elevator nose-down tendency revealed climb relatively shallow high speed watch hypnotically may quarter mile out before wake up establish climbing turn fore soon climb attains good airspeed increase up trim very slightly until see climb angle looks good same time incorporate wide shallow-banked turn can maintain itself hands off Cor rections expected nose high climb seems slugglsh relative machine watch large speed differences remove up trim slight Continued page 128 38 Model Aviation MICROMJZ4 East main ClintonI o VESt Please rush new Microtux Flexible Shaft U Machine Set understand ft em oumpletely satisfied U Imay return purchase within 30 days oomptete refund osed check money order $10995 plus $5 00 ipplng & handling NJ residents must add 6% sates tax ip order COO $200 additional o Charge credit card El VISA 0 AMEX El MASTERCARD ACOT 4Exp I U I I MAUC crr ~LFFEWIThALLUr - - LACCESSORIES U U U ____________ STATE El Send FREE 48PAGECATALOG sde USA send $200I 015e7 MIsts Maik THE LEADER IN COMPETITION PROPELLERS b6 NEW tL F 4 CYCLE DIAPITCH THP 1266778 136778 146778 1567 16678 PRICE 299 379 479 689 989 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIAPITCHPRICE 534149 634149 72833456179 8334568189 845667199 9456677199 1045667209 106W8W209 10BEW219 114677775a8229 115W229 116EW239 1167239 124W279 12SW279 1256279 1356349 1456459 1556659 164N969 16678969 RC PYLON RACING SERIES 500 DIA PITCHPRICE 75N 5N279 8677/a6299 SERIES 400C 866777/a289 9777289 W WIDE BLADE EW EXTRA WIDE hI IUARRAW Safety/Preston Continued page 125 sound running model airplane engine seems draw children like magnet possible launch fly CL model using stooge oneself dont recommend helper sometimes difficult keep people straying circle recall another letter received subject related episode CL modeler flying public park lady walk dog straight through circle totally oblivious fact model flying overhead Ive frequently told RC modelers fly alone message applies equally CL modelers Have safe month John Preston 2812 Northampton St N W Washington DC 20015 Heron/Winter Continued page 38 increments Yes may need override stick comforting thought Heron capable gliding back hair-raising distances Approaches difficult dont have large open areas area confined may windup making series wide 360s around yourself However Heron can maneuvered quickly abort go-round observe last climb sluggish side always shut down leaves enough battery capacity least several gorounds Dont belabor last climb thats can get battery too hot experimentally-minded builder encouraged try different motor bat tery combinationsincluding 800 mAh cells various numbers cells Du ration climb glide will different other may better worse depending what plane ball park docile less spectacular LeCrate geared 05 2l fixed 11-7 wood prop 361 Leisure 05 will handle big folders Id start 12-in Master Airscrew folder other good ones case Mabuchi remember comes iron band Robbe Without band expect performance would what landing gear re moved geared Astro Cobalt seven cells 800 mAh capacity its correct prop Herron will come reasonably close competition things like Heron exactly way RC Aerobatics/Van Putte Continued page 41 wont excerpt Editors note information about Competi tion Newsletter section magazine month RMcM Suffice say Nats should much better year Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 Old Timer 2Yk2kAom L5NZOS 8 Gas MODEL 1941 BROOKLYN DODGER 56 Cabin 0NEW65T Retail $52 95INTRODUCTORY PRICEO $3900 1938 Record Bi-eake- 96 $5956 tt3MZipper t9S5356 1938 Kloud King 63 $42 36 1981 Brigidier 56 $4076 1991 super-Quaker 78 5/276 1940 50 Long 55S3036 1936 Buccaneer 89 $0996 1938 Clipper MKI 72$9156 1937 Dallaire 158 575 16 1935 Miss America 84 $7196 1941 Playboy Sr 80 $5116 1991 Playboy Jr 59 $3116 1938 Powerhouse 89 05356 1990 Sailplane 78 $8976 1938 Trenton Terror 32 $40 76 1990 Ranger 96 $3196 1939 Korda Wake 99 $1916 1939 Mercury 72 6 kits qualify SAM events PP & B/C feature highest quality machine cut & sanded ports Superior oil Competition sheet ond strip wood wire & window material Plans orig FF hut models easily convertible 2ch R IC KITS Sailplanes Electric power Gas Hobby Horn SbNSOAR Glider 78 5s $1000 Midway Model GNOME R/G Hand Launch Glider$2900 Jolly Models FLINGER R/G HLG 58 span $2900 Midway Model FAST EDDIE Aerobatic /05 Elec$1908 Jolly Models ELECTRICUS Electric Glider 05s$3258 Leisure PLAYBOY SR 67 Gear 05 Elect $3000 Astro ASTRO SPORT 37 Direct 05 Elect $2250 Leisure WASP 37 Direct 05 Electrics $2250 Midway ULTRA MK IV 86 Geared 09 EP $3900 Midway FLYING QUAKER 09 90-959 stroke $6976 9ks/Midway DENNY JR 72 Alsim Cowel $6396 9ks/Midwav BUZZARD BOMBSHELL 72$0196 FULL LINE OF ELECTRIC SYSTEMS 5 Parts Avail slitrriii & HANDLING Up $000 add $150 $001 $2000 add $225 $2001 $9500 add $300 $9501 $7000 add $350 aver $7000 add $900 CA Addressees add 6% law Send MO Visa/MCI#rEapl Check allow up 30 days CK clearance COD Exact Charges pbs $150 Hdl Cash Only 64 Page lasasuuuum $200 PP/tst Class copy will sent free-when requestedwith order HOBBY HORN 15173 Moran St IA PO Bow 2212 Westminster Ca 92609 719 8938311 [Aft Hrs 714 8951203] SERIES lOU THP DESIGN TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW \ / II vnYE Hedge Hoppin Vol 3 Special Feature Warbird Action Tos Model * Action Interviews Scale JETS British Concorde SST * Relmi Ba Con Ira Beginner $07 Mis 49 95 K 2 Ba F gb TansgForBeginners 65Mm 4495 3 Wo Mode 0500 gOMno 449$ QhkohOe em 55Mm3995 5Airplase Fancies 30 Mm Wild3995 6US Scale Masters 60 Mis413$ 7 Warbirds Action 7$ Mis Fantastic499$ 8Hedge HoppinVoll 45Mm419$ 9Whick Way Up 70 Mis Aerobatics4795 lOHedge Hoppin Vol 2 $0 Mm4095 $1 Hedoe Hoppin Vol 3 30 Mm3495 Hedge Hoppin Series Feature Variety Avaia lion Topics Full Scale & Model OrderIng InformatIon Rentals $1495 Rental DeposIt Retail Price Tape Rental DuratIon 7 Days After Delivery K Paymentt Check 10 days M 0 /M C Card # K & Esp Dale Pbone # C 0 D s Available Phone ShIppIng 3 75 Foreign Canada Add 00% Total Otters 15% IL Res Add 7% Tao Academy AvIatIon R & D PO Box 277 Hazel crest IL 60429 5 312 335-0776 Z 128 Model Aviation