II YOLfd never Know tnai mis picmur iuy e Trockels taken nervous day author Reason First IligIlts 01 flis i- LUD iii progress As turned out plane flew off board J-3 now has variable throttle controlbut didnt back 1979 firstflight day snapped gliding sweet three-point landing power off plane real crowd charmer Planes flying months topic author describes detail what works him examples what should work com plete charts record history own overall flying activity flight-time performances four basic model types electric motor power theme runs throughout successful models have strong lightweight structures Part 7 EBob Kopski IN THIS SECTION next Ill try bring together often promised past issues youve following series time finish next months segment should well-equipped way experiencing first-time continuing Electric successwith under standing Its what call Electric Elation Four electrifying profiles success Long ago Part I took strong issue some common misconceptions electricpowered flying too difficult too heavy fly well doesnt have enough power offers too short flight month Im going take allencompassing swipe false impres sions presenting array hard data four different Electric airplanes suc cess stories include powered glider aerobatics type Sport Scale OldTimer should cover majority reader interests relatively simple airplanesno complicated high-technology machines beyond reach average modeler data mentioned include information hundreds flights planes As read will see histograms flight time performance no wild claims particular vital statistics planes involved Later well look some rules-of-thumb apply easy guidelines can apply achieve same satisfying gratifying Elec tric success An electric year Before get de tails planes let describe kind Nostalgic Playboy Cabin recalls everything trom yesteryear except spark goo gas engine Its transparent yellow MonoKote cov ering glistens sun showing off interesting structure Side windows clear MonoKote Front windshield open cooling air 40 MnI Aviation flying relevant because Im author because basis performance information presented earlier section t mentioned Im basically sport flier Other some friendly club fun fly events no com petitive flying Also live fly south eastern Pennsylvania makes subject terms conditions four-season year Although club Keystone RC Club flies year round moderated proviso weather permitting fact great percentage aero exploits takes place about six seven months given year Obviously flying done summer least winter demonstrated Fig histogram flights month 1982 chose graph 1982 because last complete year have data 1983 still progress written Fig clearly shows Electric flights occur As general rule no reason cannot fly Electrics year round far equipment goes its matter climate personal desire de termination craziness Along line KRC holds its annual First Frosty Fingers Fun Fly January 1 no matter what weather evident data format plane performance generally bet ter respects cooler drier months thats peculiar Electrics Lets break flight-year' profile down little Being sport flier fly its enjoyable convenient Specifically find evenings weekend mornings gratifying relevant because best thermal conditions part activity part data have collected Thus can safely view happy Electric flyin facts herein being factual conservative well nothing contrived Good bad flights alike graphed can confidently read see yourself what Electric performance can like can compare experiences ones youve heard about comment about things may hear flight watch always seems either too short too long depending upon point being made way flight times shown clocked launch landing nearest second However purposes simplicity graphing times shown rounded larger fractions minute Profile 1 powered glider Ive frequently mentioned Spectra design first performance profile well look Spectra-Soar glider member Spectra family Recall Part aspect Spectra design versatility different electric power systems can have used model Remember view what follows example nothing magical about Spectra Most planes similar charac teristics should perform comparably first tangible lesson 'what flies way another involves virtually everything written far series Fig 2 composite histogram two Spectra-Soars Together 283 flights charted 1982 1983 date should perfectly clear design 12 13-mm airplane average no ther mals course some longer flights shown thermal-assisted fact some long off graphs scale Some flights short test hops quickies end day vast majority flights piled up middle chart ones count Theyre ones should able equal time No adver tising hype friends just facts Lets look some other things Fig 2 Spectra-Soar #1 #2 belongs friend Spectra #2 data included just prove can exhibit same nominal performance However since has accumulated data lets look closely Notice 1983 year-to-date data plotted directly top flight infor mation 1982 peak essentially same fashion 165 data points flights plotted 1982 83 flights 1983 no different character means after first group 165 battery performance remained exactly same next 83 flightson premise total flight time average gauge battery performance clearly supportive position Part 4 bat teries last hundreds flights given proper care Now big news data accumu lated Spectra #1 five different motor types using same battery six 12 Ah cells motors used equally same number flights basically no difference total average flight time among motors some motor/prop combinations burned power climbed ag gressively shorter time total flight times less same preceding paragraph heavy stuff friend may want read again effect saying no matter FArh IQSU Al Fig 2 shows cnaracterstics two Spectras authors identified No 1 text the right John Hickeys Spectra other V-tail Six varia tions used members KRC Model convenient size transporting inexpensive motor system provides plenty power Chart shows provides satisfying flights all-white clean-lined Persuader design convinces people Electric can Pattern aerobatics pretty well planes performance has never drawn criticism instead has re ceived plenty acknowledgements holds KRCs record rolls-per-minute FIGURE ONE 1982 ELECTRIC FLIGHT PROFILE FOR B KOPSKI 120 100 80 60 40 U CD Li Li 0 w -m z 20 0 u J F Spectra-Soar Powered Glider Vital Statistics Wing styleRectangular Wingspan67 Wing chord constant8 Wing area planform536 sq DihedralPoly Wing frame weight45 oz Wing weight covered6/3 OZ AirfoilFlat bot 12% turbulated Tail assemblySheet balsa Tail weight covered1 oz Fuselage construction sheet box Fuselage weight complete3 oz RadioThree channels used Controls Elev Rud Mot ON/OFF prop stop Radio battery250 mAh Radio weight7 oz Motor batterySix 1 2 Ah cells Motor controlMicroswitch Battery weight12 oz Motor Various Astro Leisure Mabuchi DriveDirect PropsVarious 6-4 8-6 Motor/prop weight6-7/2 OZ Misc weightApprox 2 oz Total plane weight3839/z oz Power system weightt920/2 oz Wing loadingl0--1O5 oz/sq ft what appropriate motor suitable prop use plane flies about same total time same battery charge Thats just true plane should hold true similar plane remember Part 4s discussion about batteries described ways charging including conservative charging technique method does fill battery maximum stops short about 20% average 25 flight data Fig 1 such charging other examples course longer flights would result used digi tal charging Ive said before dont care clear kind airplane charge fly will keep air almost continuously Oh such Electric Elation Now lets take detailed look Spectra-Soar Remember plane similar example should perform comparably FIGURE TWO SPECTRA SOAR FLIGHT TIME HISTOGRAM D 1982SPECTRA #1 1983 TO DAIJ E SPECTRA #2 TOTAL FLIGHTS 283 II III II I 8 9 10 II 12 13 MINUTES II I I I 4567 7 ~FLEJi 1111111 14 15 16 17 18 19 20 21 So much fine details Lets step back look bigger picture Par ticulars stand out tabulation clude fact power system about half total plane weight typical number Also battery about 30% total plane itself light also strong holds record consecutive loops KRCa real wing-tester wing loading typical electric-powered gliders Ive seen Actually wing loading easily improved wing area can increased far rapidly corresponding increase overall weight statistics key plane light need lightness license weakness plane must have strength right places overall dur ability survive year after year routine handling Later well see some ways help accomplish Now lets get back motors props motor/prop combinations used model include two Astro OSs pn 2107 now discontinued 7-6 8-4 Top Flight Nylon Astro 075 XL 7-4 7-6 8-4 Top Flight Nylon last two much too large Leisure LT-50 Pattern Wind 6-4 7-6 Top Flight Nylon 7-6 too large Cox Gray Mabuchi RS-5505-6530 Mabuchi 550S both using 7-6 8-4 props practical purposes total flight times combinations virtually same As additional point interest combinations Spectra friends Spectra #2 has flown original Astro 05 pn 2107 economy motor thats perfectly satisfactory application 2107 originally marketed eight-cell 55 Ah battery GRAPH REPRESENTS TOTAL OF 511 FLIGHTS OF 8 ELECTRICS VIMr A50ND MONTH U Iz CD - Li LJ -o w -m -z 20 IS 10 5 0 swinging 6-4 prop documented flight performance Spectra #2 six 12 Ah cells larger props As esti mate based other planes experience eight-cell 55 Ah pack would result Spectra-Soar flights about 6 7 mm Profile 2 aerobatic plane some reason measure Electrics model ers minds well poorly Pattern flying particularly curious because part people Ive seen Electrics arent aerobatics dont seem least bit concerned having fun blowing holes sky Nevertheless find phase flying liking well take closer look application First what Ive seen Elec tric no match conventional glowpowered Pattern planes least very long flights Thus youre thinking ing what big boys forget other hand relatively simple aero batics 5 mm liking read What relatively simple aerobatics Ill list what have either seen done myself inside outside loops aileron rolls sustained inverted flight spins knife edge Immelmanns hammerheads split-Ss long answer de picted Fig 3 Fig 3 histogram flight time number flights Persuader name has purpose plane convinces people Unlike glider flight time aerobatic plane much longer useful motor run time Such plane depends continuous power perform Also un like glider motor prop choices limited because efficient power deliv ery required desired flight charac teristics given power system aerobatic plane flight time determined large extent nature flight con stant maneuvering flight windy condi tions very hot humid air average power consumption relatively high contrasts power consumption flying done straightaway speed increases prop unloads cur rent drain reduced flights longer Putting another way longer flights will result simple up-and-down-the-field flight aerobatics listed previ ously mind lets examine Fig 3 Notice general lack peaking flatter broader shape histogram en velope like think plane 4 5-mm machine depending mood because influences fly course data conclusions assume equal charges flight data shown essentially flights resulting conservative charge limited number cases chose digital charge resulting flight about /2 mm longer apparent average 4 mm relatively 1983 DATE FIGURE THREE PERSUADER FLIGHT TIME HISTOGRAM 10 1982 I C -J LL 5 0 w zri 0Ii 1020304050II62b30405 345 MINUTES 25 20 U 15 CD U 0 U 10 z 5 10 20 30 40 50 6 FIGURE FOUR 1980 THRU 1983 TO DATE J-3 SPORT SCALE FLIGHT PROFILE II 3456 MINUTES few shorter flights graphed almost due either 'short charge' purposely-terminated flight Unlike Spectra Persuader has flown Cobalt 05 six-cell 12 Ah battery say workable power system Persuader derived Wasp published Jim Zarembski RCM have seen several Wasps KRC Electric Fly events powered both Astro Cobalt OSs Leisure LT-50s both impressive performance fact Jim lists several candi n II'I' 78910 date power systems Wasp plans Since Ive used combination above can report Incidentally Persuader will fly aerobatic maneuvers listed Since has no rudder control maneuvers requiring course out Since Ive now begun talk about makeup plane lets move Vital Statistics Persuader As case Spectra Persuader example Similar designs should perform comparably Continued page 44 nO4 AVI FIGURE FIVE PLAYBOY OLD-TIMER FLIGHT PROFILE 6NOTE NOT SHOWN ARE FLIGHTS 15OF 45 MIN 31 SEC AND CD37 MIN 39 SEC J4 CA LA3 0 U2 zII 0FJF1F1 0 10 02530 MINUTES FOUR CYCLE ENGINE MOUNTS High tensile aluminum alloy Precision machined polished Hardened socket cap screws included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENYA 601295 No 31995 ENYA 901295 No 31452 HP VT 21750 No 31644 HP VT 49895 No 31654 MAX FS 40895 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201995 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45895 No 32195 SAITO FA 1201995 AT MOST HOBBY SHOPS OR OROER DIRECT Send 100 tor 12 page Illustrated catalog Handy Tools Precision Sanding ALUMINUM EXTRUSION SANDING BLOCKADJUSTABLE TENSION use RUFF-STUFF82HAND BELT SANDER Self adhesive sandpaperFIRMLY HOLDS PAPER Makes Sanding InSmallFOR EASIER SANDING Areas Snap$220 Wont Wear Out~~A ed flats curves Handy Use Handy Hold 11 inch $235 Easy Use 22 Inch sasoextra strips $1 40 APPLIED DESIGN CORPAdd 20% torcatalog 738 PENN STREET EL SEGUNDO CA 90245 torPoatago Persuader Aerobatic Vital Statistics Wing styleRectangular Wingspan37 Wing chord constant8 Wing area planform296 sq DihedralNone Wing frame weight3 oz Wing weight covered4 oz Airfoil . NACA 2410 semi-sym 10% Tail assemblySheet balsa Tail weight coveredNo data Fuselage construction . sheet box Fuselage weightNo data RadioThree channels used ControlsEIev Ail Mot ON/OFF Radio battery70 mAh Radio weight5/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorAstro Cobalt 05 DriveDirect Prop7-6 Top Flight Nylon Motor/prop weight6 oz Misc weightApprox 2 oz Total plane weight33 oz Power system weight19 oz Wing loading16 oz/sq ft Again basic airplane very light about 85 oz structure theless strong durable must withstand aerobatics survive general flying landing handling Notice power system about 58% total weight plane itself less 26% Later will see quantitatively important weight really As special point interest notice mention 70 mAh radio battery con sists four cells removed General Electric 9V Ni-Cd consumer-grade battery provides enough power four flights stop four discharge re charge field As writing have 436 flights pack first used earlier aerobatic plane before finding home Persuader may very well have read about heard better performance described have Im sure exists other extreme Im sure have impression Electric gliders What presented pro file real workable electric-powered aerobatic plane Theres no magic involved anyone used flying prop will have learn fly wing Nevertheless should able match kind performance beat please let know remember Im easily impressed lot shouting hand-waving about great some flight seemed Theres too much sort prop wash already Instead come 1984 Electric Fly persuade Profile 3 Sport Scale perhaps ming Electric applications Continued page 132 AALAA-I- Electric flight challenge sport flier competitor alike Watts Up introduction should gratifying Happy landings Radio Technique/Myers Continued page 39 ing microscopic whiskers through sulating paper can blow out whis kers high-voltage charge really trust cells afterward dont So away workbench lot Chargemaster may prove fine tool Ace RC Inc Box 51 lE Higginsville MO 64037 George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 [ writing advertisers mention t read about ModI Aviation J-3 has proven over years real crowd pleaserprobably because its good old J-3 fact touches ob servers plane built winter 1978-79 first flown March 3 latter year didnt know till later Bob Boucher Astro Flight design ing Porterfield same time two planes very similar date J-3 has accumulated 334 flights drop oil has soaked 150 depicted Fig 4 Prior 1980 keeping record flight time date number flights thats reason about half plotted Fig 4 obvious five-mm airplane can see vital statistics what details Heres some information about plane J-3 scratch-built using Sig plans guideline Since electricpowered knew plane itself lightweight rugged kit version glow engine would set about redrawing plans choosing construc tion techniques wood sizes consistent application also changed air foil 12/2% flat-bottom section Dihedral added lieu ailerons Result real charmer Admittedly 1-3 fair-weather flier does handle wind well defi nitely fun fly calm air typical flight starts small amount ground handling followed taxi takeoff Fol lowing climb-out back off proportional throttle cruise around Flybys snapbeautiful experience plane pussycat handling several times Ive nearly hypnotized myself flying myself Usually Ill some touch-and-goes two inside loops playing throttle control needed plane glides nicely note some longer lift-assisted flight times Fig 4 generally keep power whole flight varying amount de sired effect About third time have enough power left after landing taxi back pit area Otherwise power out have bring back dead-stick 1-3 good example inadequate battery cooling Im fourth battery heat reason time design construction what looked like good installation cooling has proved adequate Whatever knowledge may have Electrics has come cheaply 15-size motor used plane new version plane new so-called black back 15 current model Astro 15 rather different motor Ferrite 15 uses 12 cells 12 Ah may install someday get longer flights overall weight will increase about 9 oz estimate flight time should increase about 8-9 mm Look over vitals get general idea candidate designs around would perform comparably would require some modeling effort make suitable electric power J-3 example Astro Porterfield 132 Model Aviation Watts Up/MarronElectrics/Kopski Continued page 130 Continued paqe 44 jSSOATES INCNEW MO 13 N IS Dont bee stung AIDS CLOUD WAYHAYWARD CA 945S OS4ONCsalaENYA GUARANTEED CY NO 5310 Os l2O4cy NO 5317 HOT SHOT Hor~US PAT 4405890 Hand held rechargeable glow plug energizer size engine uses gtow plug Small enough carry yoijr shirt pocket Makes dry cell batteries power losing wires thing ot past Easy attachment cowd engines Reinforced extra hard use Can charged upto 1000 times Uses HEAD LOCK glow plug connector MODEL PRODUCTS CORP positive corinec tion tothe glow plug 90 day unconditional guarantee plus limited warranty up year Complete instructions charger Available dealer order direct Visa Mastercard accepted Add Si 50 postage power convenience $1995 Without charger $1595 b & r Hobbies PO Box 192 Oscoda MI 48750 [517] 7393549 Making Leisure Time Enjoyable excellent kit example way opinion roughly size plane power system about minimum neces sary reliable ground handling takeoff grassy fields under varying weather con ditions Except some occasional tail dragger-itis plane always gets off J-3 Sport Scale Vital Statistics Wing styleScale Wingspan70/2 Wing chord constant10 Wing area planform sq Dihedral5 deg/panel Wing frame weight6/4 oz Wing weight covered10% oz Airfoil12% flat bottom Tail assemblyBuilt-up Tail weight covered2 oz Fuselage construction tick built-up Fuselage weight No data Radio Three channels used Controls Rud Elev Mot Radio battery 250 mAb Radio weight 8 oz Motor battery 16 cells 55 Ah Motor control Variable speed Battery weight 16 oz Motor Astro 15 reducer Drive Belt Prop Top Flight 12-8 wood Mot Red prop weight 13 oz Misc weightApprox 1 2 oz Total plane weight68 oz Power system weight .. 30 oz approx Wing loading14 ozIsq ft Otherincluded above Wing struts Hdwr1 oz Wheels Trexler lOG2 oz Comp LG Assy4 oz Again same message plane must lightweight Please dont confuse being weak fragile such need notbe case particular model has over 300 flights approaching its fifth birthday 1-3 has its share Profile 4 Old-Timer recent plane Playboy Cabin Old-Timer built Leisure kit am ordinarily kit builder wanted new plane hurry Ive wanting Old-Timer years natural As writing plane about two months old dont have nearly much accumulated flight data other examples plane perfectly delightful fly product review product review product review modeler likes complete sets tools very good value selec tion six screwdriver sizes included set hex-nut drivers precision wrench es hex-nut key drivers assorted Phillipshead screwdrivers sizes convenient modeling purposes Altogether get 21 pieces plus handy tray $700 product review product review product review Old-Timers everyones preference everyone seems enjoy watch ing fly currently holds KRC Longest Flight Record 45 mm 31 sec can see Fig 5 charac teristically 10 16-mm plane suspect accumulate flights peak will reached flight profile will probably fall around 13 mm plane handles wind surprisingly well its light wing loading poly dihedral undercambered airfoil Lack ing steerable wheel plane doesnt much ground will take off unassisted time low grass some headwind ground roll ap proaches zero enough wind some tricky controlling plane will fly back wardswith no bad tendencies Like gliders would normally think putting variable-speed control OldTimer No doubt because Free Flight conditioning just get thing up high possible quickly possible However Im stuff anymore no fields now wish built proportional motor control Having vari able throttle adds new dimension already enjoyable airplane found out 1-3 first flown OFF-LO HI power control ways Playboy similar excellent candidate feature course youre Elec tric O-T competition just stay ON-OFF motor control As before vital statistics give some detail Again lightweight oper ative word cannot stress point too much have seen magnificentlyconstructed Electric Kadet equally supurb Flyline Megowcoupe truly fine craftsmanship same modeler fail fly solely because planes too heavy say least planes bit over-embellished extra struc ture lots heavy wood pieces various nif ty fittings Continued page 136 March 1984 133 ALL SHEET ONE PIECE AAA GRADE KILN DRIED SANDED TO CLOSE TOLERANCES PED 100% 17318x1112 261/2x2 30 37 rough landings aborted takeoffs hectic fun fly events hangar dings once spun down because ran radio battery down Its its third set wheels Ive used test purposes carry dead weights 8-oz I-lb iron blocks Other pilots have flown including young boy never held transmitter Obviously has taken much abuse Screwdriver Tool Set @ $700 Polks Model-Craft Hobbies Dept 2084 346 Bergen Ave Jersey City NJ 07304 tel 20 1/3328100 POWRZOOM winch serious flyer demands extraordinary launching power sailplane particularly F3Bscale cross-country Included antikiting/ antibacklash brake 2200 ft braided nylon 160 lb line manual tow drum foot brake new specially engineered motor much capable drum speeds 5000 rpm launching 3 meter sailplane ijchoose speed select pulleys j% launcha minute flights use companion RETRIEVER $250 Electrics/Kopski Continued page 133 Im convinced both planes good candidate designs Electric structures must beefed up lightness Personally felt terrible because somehow failed convey importance lightweight flying friendnot once twice Being determined stal wart modeler now off finishing two electric-powered Old-Timers Buzzard Bombshell Playboy Remember what said earlier series suggest thinking terms quarter ouncesfour make up ounce four make up quarter pounder Playboy Old-Timer Vital Statistics Wing styleElliptical tips Wingspan68 Wing chord constant9/2 Wing area planform576 sq DihedralPoly Wing frame weight4 Oz DAVE V SYSTEMS CORPOR ION ONE WOOD LANE MALVERNPA19355 215644-0692 Write call information Wing weight covered6 oz AirfoilUndercambered Tail assemblyBuilt-up Tail weight covered11/2 OZ Fuselage construction uilt-up stick Fuselage weight covered 31/3 OZ RadioThree channels used Controls .. RudElev ON/OFF Mot Radio battery250 mAh Radio weight6/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorLeisure LT-50 DriveLeisure 251 gear Prop10-6 11-6 Mot gear prop weight7/2 Oz Misc weightApprox1 2 oz Total plane weight41 oz Power system weight20 oz Wing loading1O/4oz/sq ft need new timers fly like plane second installment Planes Flying next month 11 look some ways build strong lightweight model structures Therell some rules thumb will help maximize Electric achievementand some thoughts what plane choose Meanwhile please direct comments questions SASE author Bob Kopski 25 West End Dr Lansdale PA 19446 RC Scale/Wischers Continued oaoe 47 made exclusively model cant used another plane Too much lost model isnt rebuilt large investment time money normal Scale modeling makes sense expend effort direction preservation No 1 admonition make certain good battery life before flying session since batteries common source problems lead air plane damage Cyclers have place arent really insurance against failure much inclined rely upon expanded-scale voltmeter resistance load quick battery check first time voltmeter needle drops sud denly doesnt come up proper level good Scale model will have saved possible destruction next flight Overworked receiver cells carrying load swarm servos subject vibration weak link RC sys tem Using larger-capacity cells isnt solu tion because dead cell drops voltage below requirements Larger cells per mit flights larger servos 18 Scale airplanes nine flown regu larly have same charging jack sake convenience Deans-type socket switch wiring harness Plug ging meter simple matter leaves no excuse omitting check same meter can used checking trans mitter batteries peace mind alone its worth $16 price Tower Hobbies Second importance models bal ance point Tail-heavy models can flown incidence angles wing stabilizer properly set up burden controlling such unstable beast too great experienced fliers nose-heavy model may WING SPAN4 WING AREA198 51 ENGINE15 WEIGHT34 IS Babe body loan wing sheeting die Cut formert rolled planS 2 nSf. 15 HIGHLY AEROBATIC DESIGNED Weller Nu Dentouk Jr PEPPERMINT PATTIE 15 STINGER II CMASTER KJT Div BAR/RICH SALES CO 2 FAIRWAY-HANNIBAL M0834G1314/221 8853 WING SPAN 30 WING AREABOA sqin ENGINE45 EIGHT5s balsa unstractiOn die Cut lornCrs ribs 2shts InlI Claw plans Good ground Seedling gaelIc lending good first bipe FU LLY AEROB ATIC NEW R/C BOOKLET Answers questions often asked want get started R/C flying PLUS troduces best airplane start GOLDEN FALCON receive Copy ____________ SEND $200 TO ST CROIX OF PARK FALLS LTD PO Box 279P Park Falls WI 54552 136 Model Aviation batter inc1d * plus shipping
Edition: Model Aviation - 1984/03
Page Numbers: 40, 41, 42, 43, 44, 132, 133, 136
II YOLfd never Know tnai mis picmur iuy e Trockels taken nervous day author Reason First IligIlts 01 flis i- LUD iii progress As turned out plane flew off board J-3 now has variable throttle controlbut didnt back 1979 firstflight day snapped gliding sweet three-point landing power off plane real crowd charmer Planes flying months topic author describes detail what works him examples what should work com plete charts record history own overall flying activity flight-time performances four basic model types electric motor power theme runs throughout successful models have strong lightweight structures Part 7 EBob Kopski IN THIS SECTION next Ill try bring together often promised past issues youve following series time finish next months segment should well-equipped way experiencing first-time continuing Electric successwith under standing Its what call Electric Elation Four electrifying profiles success Long ago Part I took strong issue some common misconceptions electricpowered flying too difficult too heavy fly well doesnt have enough power offers too short flight month Im going take allencompassing swipe false impres sions presenting array hard data four different Electric airplanes suc cess stories include powered glider aerobatics type Sport Scale OldTimer should cover majority reader interests relatively simple airplanesno complicated high-technology machines beyond reach average modeler data mentioned include information hundreds flights planes As read will see histograms flight time performance no wild claims particular vital statistics planes involved Later well look some rules-of-thumb apply easy guidelines can apply achieve same satisfying gratifying Elec tric success An electric year Before get de tails planes let describe kind Nostalgic Playboy Cabin recalls everything trom yesteryear except spark goo gas engine Its transparent yellow MonoKote cov ering glistens sun showing off interesting structure Side windows clear MonoKote Front windshield open cooling air 40 MnI Aviation flying relevant because Im author because basis performance information presented earlier section t mentioned Im basically sport flier Other some friendly club fun fly events no com petitive flying Also live fly south eastern Pennsylvania makes subject terms conditions four-season year Although club Keystone RC Club flies year round moderated proviso weather permitting fact great percentage aero exploits takes place about six seven months given year Obviously flying done summer least winter demonstrated Fig histogram flights month 1982 chose graph 1982 because last complete year have data 1983 still progress written Fig clearly shows Electric flights occur As general rule no reason cannot fly Electrics year round far equipment goes its matter climate personal desire de termination craziness Along line KRC holds its annual First Frosty Fingers Fun Fly January 1 no matter what weather evident data format plane performance generally bet ter respects cooler drier months thats peculiar Electrics Lets break flight-year' profile down little Being sport flier fly its enjoyable convenient Specifically find evenings weekend mornings gratifying relevant because best thermal conditions part activity part data have collected Thus can safely view happy Electric flyin facts herein being factual conservative well nothing contrived Good bad flights alike graphed can confidently read see yourself what Electric performance can like can compare experiences ones youve heard about comment about things may hear flight watch always seems either too short too long depending upon point being made way flight times shown clocked launch landing nearest second However purposes simplicity graphing times shown rounded larger fractions minute Profile 1 powered glider Ive frequently mentioned Spectra design first performance profile well look Spectra-Soar glider member Spectra family Recall Part aspect Spectra design versatility different electric power systems can have used model Remember view what follows example nothing magical about Spectra Most planes similar charac teristics should perform comparably first tangible lesson 'what flies way another involves virtually everything written far series Fig 2 composite histogram two Spectra-Soars Together 283 flights charted 1982 1983 date should perfectly clear design 12 13-mm airplane average no ther mals course some longer flights shown thermal-assisted fact some long off graphs scale Some flights short test hops quickies end day vast majority flights piled up middle chart ones count Theyre ones should able equal time No adver tising hype friends just facts Lets look some other things Fig 2 Spectra-Soar #1 #2 belongs friend Spectra #2 data included just prove can exhibit same nominal performance However since has accumulated data lets look closely Notice 1983 year-to-date data plotted directly top flight infor mation 1982 peak essentially same fashion 165 data points flights plotted 1982 83 flights 1983 no different character means after first group 165 battery performance remained exactly same next 83 flightson premise total flight time average gauge battery performance clearly supportive position Part 4 bat teries last hundreds flights given proper care Now big news data accumu lated Spectra #1 five different motor types using same battery six 12 Ah cells motors used equally same number flights basically no difference total average flight time among motors some motor/prop combinations burned power climbed ag gressively shorter time total flight times less same preceding paragraph heavy stuff friend may want read again effect saying no matter FArh IQSU Al Fig 2 shows cnaracterstics two Spectras authors identified No 1 text the right John Hickeys Spectra other V-tail Six varia tions used members KRC Model convenient size transporting inexpensive motor system provides plenty power Chart shows provides satisfying flights all-white clean-lined Persuader design convinces people Electric can Pattern aerobatics pretty well planes performance has never drawn criticism instead has re ceived plenty acknowledgements holds KRCs record rolls-per-minute FIGURE ONE 1982 ELECTRIC FLIGHT PROFILE FOR B KOPSKI 120 100 80 60 40 U CD Li Li 0 w -m z 20 0 u J F Spectra-Soar Powered Glider Vital Statistics Wing styleRectangular Wingspan67 Wing chord constant8 Wing area planform536 sq DihedralPoly Wing frame weight45 oz Wing weight covered6/3 OZ AirfoilFlat bot 12% turbulated Tail assemblySheet balsa Tail weight covered1 oz Fuselage construction sheet box Fuselage weight complete3 oz RadioThree channels used Controls Elev Rud Mot ON/OFF prop stop Radio battery250 mAh Radio weight7 oz Motor batterySix 1 2 Ah cells Motor controlMicroswitch Battery weight12 oz Motor Various Astro Leisure Mabuchi DriveDirect PropsVarious 6-4 8-6 Motor/prop weight6-7/2 OZ Misc weightApprox 2 oz Total plane weight3839/z oz Power system weightt920/2 oz Wing loadingl0--1O5 oz/sq ft what appropriate motor suitable prop use plane flies about same total time same battery charge Thats just true plane should hold true similar plane remember Part 4s discussion about batteries described ways charging including conservative charging technique method does fill battery maximum stops short about 20% average 25 flight data Fig 1 such charging other examples course longer flights would result used digi tal charging Ive said before dont care clear kind airplane charge fly will keep air almost continuously Oh such Electric Elation Now lets take detailed look Spectra-Soar Remember plane similar example should perform comparably FIGURE TWO SPECTRA SOAR FLIGHT TIME HISTOGRAM D 1982SPECTRA #1 1983 TO DAIJ E SPECTRA #2 TOTAL FLIGHTS 283 II III II I 8 9 10 II 12 13 MINUTES II I I I 4567 7 ~FLEJi 1111111 14 15 16 17 18 19 20 21 So much fine details Lets step back look bigger picture Par ticulars stand out tabulation clude fact power system about half total plane weight typical number Also battery about 30% total plane itself light also strong holds record consecutive loops KRCa real wing-tester wing loading typical electric-powered gliders Ive seen Actually wing loading easily improved wing area can increased far rapidly corresponding increase overall weight statistics key plane light need lightness license weakness plane must have strength right places overall dur ability survive year after year routine handling Later well see some ways help accomplish Now lets get back motors props motor/prop combinations used model include two Astro OSs pn 2107 now discontinued 7-6 8-4 Top Flight Nylon Astro 075 XL 7-4 7-6 8-4 Top Flight Nylon last two much too large Leisure LT-50 Pattern Wind 6-4 7-6 Top Flight Nylon 7-6 too large Cox Gray Mabuchi RS-5505-6530 Mabuchi 550S both using 7-6 8-4 props practical purposes total flight times combinations virtually same As additional point interest combinations Spectra friends Spectra #2 has flown original Astro 05 pn 2107 economy motor thats perfectly satisfactory application 2107 originally marketed eight-cell 55 Ah battery GRAPH REPRESENTS TOTAL OF 511 FLIGHTS OF 8 ELECTRICS VIMr A50ND MONTH U Iz CD - Li LJ -o w -m -z 20 IS 10 5 0 swinging 6-4 prop documented flight performance Spectra #2 six 12 Ah cells larger props As esti mate based other planes experience eight-cell 55 Ah pack would result Spectra-Soar flights about 6 7 mm Profile 2 aerobatic plane some reason measure Electrics model ers minds well poorly Pattern flying particularly curious because part people Ive seen Electrics arent aerobatics dont seem least bit concerned having fun blowing holes sky Nevertheless find phase flying liking well take closer look application First what Ive seen Elec tric no match conventional glowpowered Pattern planes least very long flights Thus youre thinking ing what big boys forget other hand relatively simple aero batics 5 mm liking read What relatively simple aerobatics Ill list what have either seen done myself inside outside loops aileron rolls sustained inverted flight spins knife edge Immelmanns hammerheads split-Ss long answer de picted Fig 3 Fig 3 histogram flight time number flights Persuader name has purpose plane convinces people Unlike glider flight time aerobatic plane much longer useful motor run time Such plane depends continuous power perform Also un like glider motor prop choices limited because efficient power deliv ery required desired flight charac teristics given power system aerobatic plane flight time determined large extent nature flight con stant maneuvering flight windy condi tions very hot humid air average power consumption relatively high contrasts power consumption flying done straightaway speed increases prop unloads cur rent drain reduced flights longer Putting another way longer flights will result simple up-and-down-the-field flight aerobatics listed previ ously mind lets examine Fig 3 Notice general lack peaking flatter broader shape histogram en velope like think plane 4 5-mm machine depending mood because influences fly course data conclusions assume equal charges flight data shown essentially flights resulting conservative charge limited number cases chose digital charge resulting flight about /2 mm longer apparent average 4 mm relatively 1983 DATE FIGURE THREE PERSUADER FLIGHT TIME HISTOGRAM 10 1982 I C -J LL 5 0 w zri 0Ii 1020304050II62b30405 345 MINUTES 25 20 U 15 CD U 0 U 10 z 5 10 20 30 40 50 6 FIGURE FOUR 1980 THRU 1983 TO DATE J-3 SPORT SCALE FLIGHT PROFILE II 3456 MINUTES few shorter flights graphed almost due either 'short charge' purposely-terminated flight Unlike Spectra Persuader has flown Cobalt 05 six-cell 12 Ah battery say workable power system Persuader derived Wasp published Jim Zarembski RCM have seen several Wasps KRC Electric Fly events powered both Astro Cobalt OSs Leisure LT-50s both impressive performance fact Jim lists several candi n II'I' 78910 date power systems Wasp plans Since Ive used combination above can report Incidentally Persuader will fly aerobatic maneuvers listed Since has no rudder control maneuvers requiring course out Since Ive now begun talk about makeup plane lets move Vital Statistics Persuader As case Spectra Persuader example Similar designs should perform comparably Continued page 44 nO4 AVI FIGURE FIVE PLAYBOY OLD-TIMER FLIGHT PROFILE 6NOTE NOT SHOWN ARE FLIGHTS 15OF 45 MIN 31 SEC AND CD37 MIN 39 SEC J4 CA LA3 0 U2 zII 0FJF1F1 0 10 02530 MINUTES FOUR CYCLE ENGINE MOUNTS High tensile aluminum alloy Precision machined polished Hardened socket cap screws included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENYA 601295 No 31995 ENYA 901295 No 31452 HP VT 21750 No 31644 HP VT 49895 No 31654 MAX FS 40895 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201995 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45895 No 32195 SAITO FA 1201995 AT MOST HOBBY SHOPS OR OROER DIRECT Send 100 tor 12 page Illustrated catalog Handy Tools Precision Sanding ALUMINUM EXTRUSION SANDING BLOCKADJUSTABLE TENSION use RUFF-STUFF82HAND BELT SANDER Self adhesive sandpaperFIRMLY HOLDS PAPER Makes Sanding InSmallFOR EASIER SANDING Areas Snap$220 Wont Wear Out~~A ed flats curves Handy Use Handy Hold 11 inch $235 Easy Use 22 Inch sasoextra strips $1 40 APPLIED DESIGN CORPAdd 20% torcatalog 738 PENN STREET EL SEGUNDO CA 90245 torPoatago Persuader Aerobatic Vital Statistics Wing styleRectangular Wingspan37 Wing chord constant8 Wing area planform296 sq DihedralNone Wing frame weight3 oz Wing weight covered4 oz Airfoil . NACA 2410 semi-sym 10% Tail assemblySheet balsa Tail weight coveredNo data Fuselage construction . sheet box Fuselage weightNo data RadioThree channels used ControlsEIev Ail Mot ON/OFF Radio battery70 mAh Radio weight5/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorAstro Cobalt 05 DriveDirect Prop7-6 Top Flight Nylon Motor/prop weight6 oz Misc weightApprox 2 oz Total plane weight33 oz Power system weight19 oz Wing loading16 oz/sq ft Again basic airplane very light about 85 oz structure theless strong durable must withstand aerobatics survive general flying landing handling Notice power system about 58% total weight plane itself less 26% Later will see quantitatively important weight really As special point interest notice mention 70 mAh radio battery con sists four cells removed General Electric 9V Ni-Cd consumer-grade battery provides enough power four flights stop four discharge re charge field As writing have 436 flights pack first used earlier aerobatic plane before finding home Persuader may very well have read about heard better performance described have Im sure exists other extreme Im sure have impression Electric gliders What presented pro file real workable electric-powered aerobatic plane Theres no magic involved anyone used flying prop will have learn fly wing Nevertheless should able match kind performance beat please let know remember Im easily impressed lot shouting hand-waving about great some flight seemed Theres too much sort prop wash already Instead come 1984 Electric Fly persuade Profile 3 Sport Scale perhaps ming Electric applications Continued page 132 AALAA-I- Electric flight challenge sport flier competitor alike Watts Up introduction should gratifying Happy landings Radio Technique/Myers Continued page 39 ing microscopic whiskers through sulating paper can blow out whis kers high-voltage charge really trust cells afterward dont So away workbench lot Chargemaster may prove fine tool Ace RC Inc Box 51 lE Higginsville MO 64037 George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 [ writing advertisers mention t read about ModI Aviation J-3 has proven over years real crowd pleaserprobably because its good old J-3 fact touches ob servers plane built winter 1978-79 first flown March 3 latter year didnt know till later Bob Boucher Astro Flight design ing Porterfield same time two planes very similar date J-3 has accumulated 334 flights drop oil has soaked 150 depicted Fig 4 Prior 1980 keeping record flight time date number flights thats reason about half plotted Fig 4 obvious five-mm airplane can see vital statistics what details Heres some information about plane J-3 scratch-built using Sig plans guideline Since electricpowered knew plane itself lightweight rugged kit version glow engine would set about redrawing plans choosing construc tion techniques wood sizes consistent application also changed air foil 12/2% flat-bottom section Dihedral added lieu ailerons Result real charmer Admittedly 1-3 fair-weather flier does handle wind well defi nitely fun fly calm air typical flight starts small amount ground handling followed taxi takeoff Fol lowing climb-out back off proportional throttle cruise around Flybys snapbeautiful experience plane pussycat handling several times Ive nearly hypnotized myself flying myself Usually Ill some touch-and-goes two inside loops playing throttle control needed plane glides nicely note some longer lift-assisted flight times Fig 4 generally keep power whole flight varying amount de sired effect About third time have enough power left after landing taxi back pit area Otherwise power out have bring back dead-stick 1-3 good example inadequate battery cooling Im fourth battery heat reason time design construction what looked like good installation cooling has proved adequate Whatever knowledge may have Electrics has come cheaply 15-size motor used plane new version plane new so-called black back 15 current model Astro 15 rather different motor Ferrite 15 uses 12 cells 12 Ah may install someday get longer flights overall weight will increase about 9 oz estimate flight time should increase about 8-9 mm Look over vitals get general idea candidate designs around would perform comparably would require some modeling effort make suitable electric power J-3 example Astro Porterfield 132 Model Aviation Watts Up/MarronElectrics/Kopski Continued page 130 Continued paqe 44 jSSOATES INCNEW MO 13 N IS Dont bee stung AIDS CLOUD WAYHAYWARD CA 945S OS4ONCsalaENYA GUARANTEED CY NO 5310 Os l2O4cy NO 5317 HOT SHOT Hor~US PAT 4405890 Hand held rechargeable glow plug energizer size engine uses gtow plug Small enough carry yoijr shirt pocket Makes dry cell batteries power losing wires thing ot past Easy attachment cowd engines Reinforced extra hard use Can charged upto 1000 times Uses HEAD LOCK glow plug connector MODEL PRODUCTS CORP positive corinec tion tothe glow plug 90 day unconditional guarantee plus limited warranty up year Complete instructions charger Available dealer order direct Visa Mastercard accepted Add Si 50 postage power convenience $1995 Without charger $1595 b & r Hobbies PO Box 192 Oscoda MI 48750 [517] 7393549 Making Leisure Time Enjoyable excellent kit example way opinion roughly size plane power system about minimum neces sary reliable ground handling takeoff grassy fields under varying weather con ditions Except some occasional tail dragger-itis plane always gets off J-3 Sport Scale Vital Statistics Wing styleScale Wingspan70/2 Wing chord constant10 Wing area planform sq Dihedral5 deg/panel Wing frame weight6/4 oz Wing weight covered10% oz Airfoil12% flat bottom Tail assemblyBuilt-up Tail weight covered2 oz Fuselage construction tick built-up Fuselage weight No data Radio Three channels used Controls Rud Elev Mot Radio battery 250 mAb Radio weight 8 oz Motor battery 16 cells 55 Ah Motor control Variable speed Battery weight 16 oz Motor Astro 15 reducer Drive Belt Prop Top Flight 12-8 wood Mot Red prop weight 13 oz Misc weightApprox 1 2 oz Total plane weight68 oz Power system weight .. 30 oz approx Wing loading14 ozIsq ft Otherincluded above Wing struts Hdwr1 oz Wheels Trexler lOG2 oz Comp LG Assy4 oz Again same message plane must lightweight Please dont confuse being weak fragile such need notbe case particular model has over 300 flights approaching its fifth birthday 1-3 has its share Profile 4 Old-Timer recent plane Playboy Cabin Old-Timer built Leisure kit am ordinarily kit builder wanted new plane hurry Ive wanting Old-Timer years natural As writing plane about two months old dont have nearly much accumulated flight data other examples plane perfectly delightful fly product review product review product review modeler likes complete sets tools very good value selec tion six screwdriver sizes included set hex-nut drivers precision wrench es hex-nut key drivers assorted Phillipshead screwdrivers sizes convenient modeling purposes Altogether get 21 pieces plus handy tray $700 product review product review product review Old-Timers everyones preference everyone seems enjoy watch ing fly currently holds KRC Longest Flight Record 45 mm 31 sec can see Fig 5 charac teristically 10 16-mm plane suspect accumulate flights peak will reached flight profile will probably fall around 13 mm plane handles wind surprisingly well its light wing loading poly dihedral undercambered airfoil Lack ing steerable wheel plane doesnt much ground will take off unassisted time low grass some headwind ground roll ap proaches zero enough wind some tricky controlling plane will fly back wardswith no bad tendencies Like gliders would normally think putting variable-speed control OldTimer No doubt because Free Flight conditioning just get thing up high possible quickly possible However Im stuff anymore no fields now wish built proportional motor control Having vari able throttle adds new dimension already enjoyable airplane found out 1-3 first flown OFF-LO HI power control ways Playboy similar excellent candidate feature course youre Elec tric O-T competition just stay ON-OFF motor control As before vital statistics give some detail Again lightweight oper ative word cannot stress point too much have seen magnificentlyconstructed Electric Kadet equally supurb Flyline Megowcoupe truly fine craftsmanship same modeler fail fly solely because planes too heavy say least planes bit over-embellished extra struc ture lots heavy wood pieces various nif ty fittings Continued page 136 March 1984 133 ALL SHEET ONE PIECE AAA GRADE KILN DRIED SANDED TO CLOSE TOLERANCES PED 100% 17318x1112 261/2x2 30 37 rough landings aborted takeoffs hectic fun fly events hangar dings once spun down because ran radio battery down Its its third set wheels Ive used test purposes carry dead weights 8-oz I-lb iron blocks Other pilots have flown including young boy never held transmitter Obviously has taken much abuse Screwdriver Tool Set @ $700 Polks Model-Craft Hobbies Dept 2084 346 Bergen Ave Jersey City NJ 07304 tel 20 1/3328100 POWRZOOM winch serious flyer demands extraordinary launching power sailplane particularly F3Bscale cross-country Included antikiting/ antibacklash brake 2200 ft braided nylon 160 lb line manual tow drum foot brake new specially engineered motor much capable drum speeds 5000 rpm launching 3 meter sailplane ijchoose speed select pulleys j% launcha minute flights use companion RETRIEVER $250 Electrics/Kopski Continued page 133 Im convinced both planes good candidate designs Electric structures must beefed up lightness Personally felt terrible because somehow failed convey importance lightweight flying friendnot once twice Being determined stal wart modeler now off finishing two electric-powered Old-Timers Buzzard Bombshell Playboy Remember what said earlier series suggest thinking terms quarter ouncesfour make up ounce four make up quarter pounder Playboy Old-Timer Vital Statistics Wing styleElliptical tips Wingspan68 Wing chord constant9/2 Wing area planform576 sq DihedralPoly Wing frame weight4 Oz DAVE V SYSTEMS CORPOR ION ONE WOOD LANE MALVERNPA19355 215644-0692 Write call information Wing weight covered6 oz AirfoilUndercambered Tail assemblyBuilt-up Tail weight covered11/2 OZ Fuselage construction uilt-up stick Fuselage weight covered 31/3 OZ RadioThree channels used Controls .. RudElev ON/OFF Mot Radio battery250 mAh Radio weight6/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorLeisure LT-50 DriveLeisure 251 gear Prop10-6 11-6 Mot gear prop weight7/2 Oz Misc weightApprox1 2 oz Total plane weight41 oz Power system weight20 oz Wing loading1O/4oz/sq ft need new timers fly like plane second installment Planes Flying next month 11 look some ways build strong lightweight model structures Therell some rules thumb will help maximize Electric achievementand some thoughts what plane choose Meanwhile please direct comments questions SASE author Bob Kopski 25 West End Dr Lansdale PA 19446 RC Scale/Wischers Continued oaoe 47 made exclusively model cant used another plane Too much lost model isnt rebuilt large investment time money normal Scale modeling makes sense expend effort direction preservation No 1 admonition make certain good battery life before flying session since batteries common source problems lead air plane damage Cyclers have place arent really insurance against failure much inclined rely upon expanded-scale voltmeter resistance load quick battery check first time voltmeter needle drops sud denly doesnt come up proper level good Scale model will have saved possible destruction next flight Overworked receiver cells carrying load swarm servos subject vibration weak link RC sys tem Using larger-capacity cells isnt solu tion because dead cell drops voltage below requirements Larger cells per mit flights larger servos 18 Scale airplanes nine flown regu larly have same charging jack sake convenience Deans-type socket switch wiring harness Plug ging meter simple matter leaves no excuse omitting check same meter can used checking trans mitter batteries peace mind alone its worth $16 price Tower Hobbies Second importance models bal ance point Tail-heavy models can flown incidence angles wing stabilizer properly set up burden controlling such unstable beast too great experienced fliers nose-heavy model may WING SPAN4 WING AREA198 51 ENGINE15 WEIGHT34 IS Babe body loan wing sheeting die Cut formert rolled planS 2 nSf. 15 HIGHLY AEROBATIC DESIGNED Weller Nu Dentouk Jr PEPPERMINT PATTIE 15 STINGER II CMASTER KJT Div BAR/RICH SALES CO 2 FAIRWAY-HANNIBAL M0834G1314/221 8853 WING SPAN 30 WING AREABOA sqin ENGINE45 EIGHT5s balsa unstractiOn die Cut lornCrs ribs 2shts InlI Claw plans Good ground Seedling gaelIc lending good first bipe FU LLY AEROB ATIC NEW R/C BOOKLET Answers questions often asked want get started R/C flying PLUS troduces best airplane start GOLDEN FALCON receive Copy ____________ SEND $200 TO ST CROIX OF PARK FALLS LTD PO Box 279P Park Falls WI 54552 136 Model Aviation batter inc1d * plus shipping
Edition: Model Aviation - 1984/03
Page Numbers: 40, 41, 42, 43, 44, 132, 133, 136
II YOLfd never Know tnai mis picmur iuy e Trockels taken nervous day author Reason First IligIlts 01 flis i- LUD iii progress As turned out plane flew off board J-3 now has variable throttle controlbut didnt back 1979 firstflight day snapped gliding sweet three-point landing power off plane real crowd charmer Planes flying months topic author describes detail what works him examples what should work com plete charts record history own overall flying activity flight-time performances four basic model types electric motor power theme runs throughout successful models have strong lightweight structures Part 7 EBob Kopski IN THIS SECTION next Ill try bring together often promised past issues youve following series time finish next months segment should well-equipped way experiencing first-time continuing Electric successwith under standing Its what call Electric Elation Four electrifying profiles success Long ago Part I took strong issue some common misconceptions electricpowered flying too difficult too heavy fly well doesnt have enough power offers too short flight month Im going take allencompassing swipe false impres sions presenting array hard data four different Electric airplanes suc cess stories include powered glider aerobatics type Sport Scale OldTimer should cover majority reader interests relatively simple airplanesno complicated high-technology machines beyond reach average modeler data mentioned include information hundreds flights planes As read will see histograms flight time performance no wild claims particular vital statistics planes involved Later well look some rules-of-thumb apply easy guidelines can apply achieve same satisfying gratifying Elec tric success An electric year Before get de tails planes let describe kind Nostalgic Playboy Cabin recalls everything trom yesteryear except spark goo gas engine Its transparent yellow MonoKote cov ering glistens sun showing off interesting structure Side windows clear MonoKote Front windshield open cooling air 40 MnI Aviation flying relevant because Im author because basis performance information presented earlier section t mentioned Im basically sport flier Other some friendly club fun fly events no com petitive flying Also live fly south eastern Pennsylvania makes subject terms conditions four-season year Although club Keystone RC Club flies year round moderated proviso weather permitting fact great percentage aero exploits takes place about six seven months given year Obviously flying done summer least winter demonstrated Fig histogram flights month 1982 chose graph 1982 because last complete year have data 1983 still progress written Fig clearly shows Electric flights occur As general rule no reason cannot fly Electrics year round far equipment goes its matter climate personal desire de termination craziness Along line KRC holds its annual First Frosty Fingers Fun Fly January 1 no matter what weather evident data format plane performance generally bet ter respects cooler drier months thats peculiar Electrics Lets break flight-year' profile down little Being sport flier fly its enjoyable convenient Specifically find evenings weekend mornings gratifying relevant because best thermal conditions part activity part data have collected Thus can safely view happy Electric flyin facts herein being factual conservative well nothing contrived Good bad flights alike graphed can confidently read see yourself what Electric performance can like can compare experiences ones youve heard about comment about things may hear flight watch always seems either too short too long depending upon point being made way flight times shown clocked launch landing nearest second However purposes simplicity graphing times shown rounded larger fractions minute Profile 1 powered glider Ive frequently mentioned Spectra design first performance profile well look Spectra-Soar glider member Spectra family Recall Part aspect Spectra design versatility different electric power systems can have used model Remember view what follows example nothing magical about Spectra Most planes similar charac teristics should perform comparably first tangible lesson 'what flies way another involves virtually everything written far series Fig 2 composite histogram two Spectra-Soars Together 283 flights charted 1982 1983 date should perfectly clear design 12 13-mm airplane average no ther mals course some longer flights shown thermal-assisted fact some long off graphs scale Some flights short test hops quickies end day vast majority flights piled up middle chart ones count Theyre ones should able equal time No adver tising hype friends just facts Lets look some other things Fig 2 Spectra-Soar #1 #2 belongs friend Spectra #2 data included just prove can exhibit same nominal performance However since has accumulated data lets look closely Notice 1983 year-to-date data plotted directly top flight infor mation 1982 peak essentially same fashion 165 data points flights plotted 1982 83 flights 1983 no different character means after first group 165 battery performance remained exactly same next 83 flightson premise total flight time average gauge battery performance clearly supportive position Part 4 bat teries last hundreds flights given proper care Now big news data accumu lated Spectra #1 five different motor types using same battery six 12 Ah cells motors used equally same number flights basically no difference total average flight time among motors some motor/prop combinations burned power climbed ag gressively shorter time total flight times less same preceding paragraph heavy stuff friend may want read again effect saying no matter FArh IQSU Al Fig 2 shows cnaracterstics two Spectras authors identified No 1 text the right John Hickeys Spectra other V-tail Six varia tions used members KRC Model convenient size transporting inexpensive motor system provides plenty power Chart shows provides satisfying flights all-white clean-lined Persuader design convinces people Electric can Pattern aerobatics pretty well planes performance has never drawn criticism instead has re ceived plenty acknowledgements holds KRCs record rolls-per-minute FIGURE ONE 1982 ELECTRIC FLIGHT PROFILE FOR B KOPSKI 120 100 80 60 40 U CD Li Li 0 w -m z 20 0 u J F Spectra-Soar Powered Glider Vital Statistics Wing styleRectangular Wingspan67 Wing chord constant8 Wing area planform536 sq DihedralPoly Wing frame weight45 oz Wing weight covered6/3 OZ AirfoilFlat bot 12% turbulated Tail assemblySheet balsa Tail weight covered1 oz Fuselage construction sheet box Fuselage weight complete3 oz RadioThree channels used Controls Elev Rud Mot ON/OFF prop stop Radio battery250 mAh Radio weight7 oz Motor batterySix 1 2 Ah cells Motor controlMicroswitch Battery weight12 oz Motor Various Astro Leisure Mabuchi DriveDirect PropsVarious 6-4 8-6 Motor/prop weight6-7/2 OZ Misc weightApprox 2 oz Total plane weight3839/z oz Power system weightt920/2 oz Wing loadingl0--1O5 oz/sq ft what appropriate motor suitable prop use plane flies about same total time same battery charge Thats just true plane should hold true similar plane remember Part 4s discussion about batteries described ways charging including conservative charging technique method does fill battery maximum stops short about 20% average 25 flight data Fig 1 such charging other examples course longer flights would result used digi tal charging Ive said before dont care clear kind airplane charge fly will keep air almost continuously Oh such Electric Elation Now lets take detailed look Spectra-Soar Remember plane similar example should perform comparably FIGURE TWO SPECTRA SOAR FLIGHT TIME HISTOGRAM D 1982SPECTRA #1 1983 TO DAIJ E SPECTRA #2 TOTAL FLIGHTS 283 II III II I 8 9 10 II 12 13 MINUTES II I I I 4567 7 ~FLEJi 1111111 14 15 16 17 18 19 20 21 So much fine details Lets step back look bigger picture Par ticulars stand out tabulation clude fact power system about half total plane weight typical number Also battery about 30% total plane itself light also strong holds record consecutive loops KRCa real wing-tester wing loading typical electric-powered gliders Ive seen Actually wing loading easily improved wing area can increased far rapidly corresponding increase overall weight statistics key plane light need lightness license weakness plane must have strength right places overall dur ability survive year after year routine handling Later well see some ways help accomplish Now lets get back motors props motor/prop combinations used model include two Astro OSs pn 2107 now discontinued 7-6 8-4 Top Flight Nylon Astro 075 XL 7-4 7-6 8-4 Top Flight Nylon last two much too large Leisure LT-50 Pattern Wind 6-4 7-6 Top Flight Nylon 7-6 too large Cox Gray Mabuchi RS-5505-6530 Mabuchi 550S both using 7-6 8-4 props practical purposes total flight times combinations virtually same As additional point interest combinations Spectra friends Spectra #2 has flown original Astro 05 pn 2107 economy motor thats perfectly satisfactory application 2107 originally marketed eight-cell 55 Ah battery GRAPH REPRESENTS TOTAL OF 511 FLIGHTS OF 8 ELECTRICS VIMr A50ND MONTH U Iz CD - Li LJ -o w -m -z 20 IS 10 5 0 swinging 6-4 prop documented flight performance Spectra #2 six 12 Ah cells larger props As esti mate based other planes experience eight-cell 55 Ah pack would result Spectra-Soar flights about 6 7 mm Profile 2 aerobatic plane some reason measure Electrics model ers minds well poorly Pattern flying particularly curious because part people Ive seen Electrics arent aerobatics dont seem least bit concerned having fun blowing holes sky Nevertheless find phase flying liking well take closer look application First what Ive seen Elec tric no match conventional glowpowered Pattern planes least very long flights Thus youre thinking ing what big boys forget other hand relatively simple aero batics 5 mm liking read What relatively simple aerobatics Ill list what have either seen done myself inside outside loops aileron rolls sustained inverted flight spins knife edge Immelmanns hammerheads split-Ss long answer de picted Fig 3 Fig 3 histogram flight time number flights Persuader name has purpose plane convinces people Unlike glider flight time aerobatic plane much longer useful motor run time Such plane depends continuous power perform Also un like glider motor prop choices limited because efficient power deliv ery required desired flight charac teristics given power system aerobatic plane flight time determined large extent nature flight con stant maneuvering flight windy condi tions very hot humid air average power consumption relatively high contrasts power consumption flying done straightaway speed increases prop unloads cur rent drain reduced flights longer Putting another way longer flights will result simple up-and-down-the-field flight aerobatics listed previ ously mind lets examine Fig 3 Notice general lack peaking flatter broader shape histogram en velope like think plane 4 5-mm machine depending mood because influences fly course data conclusions assume equal charges flight data shown essentially flights resulting conservative charge limited number cases chose digital charge resulting flight about /2 mm longer apparent average 4 mm relatively 1983 DATE FIGURE THREE PERSUADER FLIGHT TIME HISTOGRAM 10 1982 I C -J LL 5 0 w zri 0Ii 1020304050II62b30405 345 MINUTES 25 20 U 15 CD U 0 U 10 z 5 10 20 30 40 50 6 FIGURE FOUR 1980 THRU 1983 TO DATE J-3 SPORT SCALE FLIGHT PROFILE II 3456 MINUTES few shorter flights graphed almost due either 'short charge' purposely-terminated flight Unlike Spectra Persuader has flown Cobalt 05 six-cell 12 Ah battery say workable power system Persuader derived Wasp published Jim Zarembski RCM have seen several Wasps KRC Electric Fly events powered both Astro Cobalt OSs Leisure LT-50s both impressive performance fact Jim lists several candi n II'I' 78910 date power systems Wasp plans Since Ive used combination above can report Incidentally Persuader will fly aerobatic maneuvers listed Since has no rudder control maneuvers requiring course out Since Ive now begun talk about makeup plane lets move Vital Statistics Persuader As case Spectra Persuader example Similar designs should perform comparably Continued page 44 nO4 AVI FIGURE FIVE PLAYBOY OLD-TIMER FLIGHT PROFILE 6NOTE NOT SHOWN ARE FLIGHTS 15OF 45 MIN 31 SEC AND CD37 MIN 39 SEC J4 CA LA3 0 U2 zII 0FJF1F1 0 10 02530 MINUTES FOUR CYCLE ENGINE MOUNTS High tensile aluminum alloy Precision machined polished Hardened socket cap screws included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENYA 601295 No 31995 ENYA 901295 No 31452 HP VT 21750 No 31644 HP VT 49895 No 31654 MAX FS 40895 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201995 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45895 No 32195 SAITO FA 1201995 AT MOST HOBBY SHOPS OR OROER DIRECT Send 100 tor 12 page Illustrated catalog Handy Tools Precision Sanding ALUMINUM EXTRUSION SANDING BLOCKADJUSTABLE TENSION use RUFF-STUFF82HAND BELT SANDER Self adhesive sandpaperFIRMLY HOLDS PAPER Makes Sanding InSmallFOR EASIER SANDING Areas Snap$220 Wont Wear Out~~A ed flats curves Handy Use Handy Hold 11 inch $235 Easy Use 22 Inch sasoextra strips $1 40 APPLIED DESIGN CORPAdd 20% torcatalog 738 PENN STREET EL SEGUNDO CA 90245 torPoatago Persuader Aerobatic Vital Statistics Wing styleRectangular Wingspan37 Wing chord constant8 Wing area planform296 sq DihedralNone Wing frame weight3 oz Wing weight covered4 oz Airfoil . NACA 2410 semi-sym 10% Tail assemblySheet balsa Tail weight coveredNo data Fuselage construction . sheet box Fuselage weightNo data RadioThree channels used ControlsEIev Ail Mot ON/OFF Radio battery70 mAh Radio weight5/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorAstro Cobalt 05 DriveDirect Prop7-6 Top Flight Nylon Motor/prop weight6 oz Misc weightApprox 2 oz Total plane weight33 oz Power system weight19 oz Wing loading16 oz/sq ft Again basic airplane very light about 85 oz structure theless strong durable must withstand aerobatics survive general flying landing handling Notice power system about 58% total weight plane itself less 26% Later will see quantitatively important weight really As special point interest notice mention 70 mAh radio battery con sists four cells removed General Electric 9V Ni-Cd consumer-grade battery provides enough power four flights stop four discharge re charge field As writing have 436 flights pack first used earlier aerobatic plane before finding home Persuader may very well have read about heard better performance described have Im sure exists other extreme Im sure have impression Electric gliders What presented pro file real workable electric-powered aerobatic plane Theres no magic involved anyone used flying prop will have learn fly wing Nevertheless should able match kind performance beat please let know remember Im easily impressed lot shouting hand-waving about great some flight seemed Theres too much sort prop wash already Instead come 1984 Electric Fly persuade Profile 3 Sport Scale perhaps ming Electric applications Continued page 132 AALAA-I- Electric flight challenge sport flier competitor alike Watts Up introduction should gratifying Happy landings Radio Technique/Myers Continued page 39 ing microscopic whiskers through sulating paper can blow out whis kers high-voltage charge really trust cells afterward dont So away workbench lot Chargemaster may prove fine tool Ace RC Inc Box 51 lE Higginsville MO 64037 George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 [ writing advertisers mention t read about ModI Aviation J-3 has proven over years real crowd pleaserprobably because its good old J-3 fact touches ob servers plane built winter 1978-79 first flown March 3 latter year didnt know till later Bob Boucher Astro Flight design ing Porterfield same time two planes very similar date J-3 has accumulated 334 flights drop oil has soaked 150 depicted Fig 4 Prior 1980 keeping record flight time date number flights thats reason about half plotted Fig 4 obvious five-mm airplane can see vital statistics what details Heres some information about plane J-3 scratch-built using Sig plans guideline Since electricpowered knew plane itself lightweight rugged kit version glow engine would set about redrawing plans choosing construc tion techniques wood sizes consistent application also changed air foil 12/2% flat-bottom section Dihedral added lieu ailerons Result real charmer Admittedly 1-3 fair-weather flier does handle wind well defi nitely fun fly calm air typical flight starts small amount ground handling followed taxi takeoff Fol lowing climb-out back off proportional throttle cruise around Flybys snapbeautiful experience plane pussycat handling several times Ive nearly hypnotized myself flying myself Usually Ill some touch-and-goes two inside loops playing throttle control needed plane glides nicely note some longer lift-assisted flight times Fig 4 generally keep power whole flight varying amount de sired effect About third time have enough power left after landing taxi back pit area Otherwise power out have bring back dead-stick 1-3 good example inadequate battery cooling Im fourth battery heat reason time design construction what looked like good installation cooling has proved adequate Whatever knowledge may have Electrics has come cheaply 15-size motor used plane new version plane new so-called black back 15 current model Astro 15 rather different motor Ferrite 15 uses 12 cells 12 Ah may install someday get longer flights overall weight will increase about 9 oz estimate flight time should increase about 8-9 mm Look over vitals get general idea candidate designs around would perform comparably would require some modeling effort make suitable electric power J-3 example Astro Porterfield 132 Model Aviation Watts Up/MarronElectrics/Kopski Continued page 130 Continued paqe 44 jSSOATES INCNEW MO 13 N IS Dont bee stung AIDS CLOUD WAYHAYWARD CA 945S OS4ONCsalaENYA GUARANTEED CY NO 5310 Os l2O4cy NO 5317 HOT SHOT Hor~US PAT 4405890 Hand held rechargeable glow plug energizer size engine uses gtow plug Small enough carry yoijr shirt pocket Makes dry cell batteries power losing wires thing ot past Easy attachment cowd engines Reinforced extra hard use Can charged upto 1000 times Uses HEAD LOCK glow plug connector MODEL PRODUCTS CORP positive corinec tion tothe glow plug 90 day unconditional guarantee plus limited warranty up year Complete instructions charger Available dealer order direct Visa Mastercard accepted Add Si 50 postage power convenience $1995 Without charger $1595 b & r Hobbies PO Box 192 Oscoda MI 48750 [517] 7393549 Making Leisure Time Enjoyable excellent kit example way opinion roughly size plane power system about minimum neces sary reliable ground handling takeoff grassy fields under varying weather con ditions Except some occasional tail dragger-itis plane always gets off J-3 Sport Scale Vital Statistics Wing styleScale Wingspan70/2 Wing chord constant10 Wing area planform sq Dihedral5 deg/panel Wing frame weight6/4 oz Wing weight covered10% oz Airfoil12% flat bottom Tail assemblyBuilt-up Tail weight covered2 oz Fuselage construction tick built-up Fuselage weight No data Radio Three channels used Controls Rud Elev Mot Radio battery 250 mAb Radio weight 8 oz Motor battery 16 cells 55 Ah Motor control Variable speed Battery weight 16 oz Motor Astro 15 reducer Drive Belt Prop Top Flight 12-8 wood Mot Red prop weight 13 oz Misc weightApprox 1 2 oz Total plane weight68 oz Power system weight .. 30 oz approx Wing loading14 ozIsq ft Otherincluded above Wing struts Hdwr1 oz Wheels Trexler lOG2 oz Comp LG Assy4 oz Again same message plane must lightweight Please dont confuse being weak fragile such need notbe case particular model has over 300 flights approaching its fifth birthday 1-3 has its share Profile 4 Old-Timer recent plane Playboy Cabin Old-Timer built Leisure kit am ordinarily kit builder wanted new plane hurry Ive wanting Old-Timer years natural As writing plane about two months old dont have nearly much accumulated flight data other examples plane perfectly delightful fly product review product review product review modeler likes complete sets tools very good value selec tion six screwdriver sizes included set hex-nut drivers precision wrench es hex-nut key drivers assorted Phillipshead screwdrivers sizes convenient modeling purposes Altogether get 21 pieces plus handy tray $700 product review product review product review Old-Timers everyones preference everyone seems enjoy watch ing fly currently holds KRC Longest Flight Record 45 mm 31 sec can see Fig 5 charac teristically 10 16-mm plane suspect accumulate flights peak will reached flight profile will probably fall around 13 mm plane handles wind surprisingly well its light wing loading poly dihedral undercambered airfoil Lack ing steerable wheel plane doesnt much ground will take off unassisted time low grass some headwind ground roll ap proaches zero enough wind some tricky controlling plane will fly back wardswith no bad tendencies Like gliders would normally think putting variable-speed control OldTimer No doubt because Free Flight conditioning just get thing up high possible quickly possible However Im stuff anymore no fields now wish built proportional motor control Having vari able throttle adds new dimension already enjoyable airplane found out 1-3 first flown OFF-LO HI power control ways Playboy similar excellent candidate feature course youre Elec tric O-T competition just stay ON-OFF motor control As before vital statistics give some detail Again lightweight oper ative word cannot stress point too much have seen magnificentlyconstructed Electric Kadet equally supurb Flyline Megowcoupe truly fine craftsmanship same modeler fail fly solely because planes too heavy say least planes bit over-embellished extra struc ture lots heavy wood pieces various nif ty fittings Continued page 136 March 1984 133 ALL SHEET ONE PIECE AAA GRADE KILN DRIED SANDED TO CLOSE TOLERANCES PED 100% 17318x1112 261/2x2 30 37 rough landings aborted takeoffs hectic fun fly events hangar dings once spun down because ran radio battery down Its its third set wheels Ive used test purposes carry dead weights 8-oz I-lb iron blocks Other pilots have flown including young boy never held transmitter Obviously has taken much abuse Screwdriver Tool Set @ $700 Polks Model-Craft Hobbies Dept 2084 346 Bergen Ave Jersey City NJ 07304 tel 20 1/3328100 POWRZOOM winch serious flyer demands extraordinary launching power sailplane particularly F3Bscale cross-country Included antikiting/ antibacklash brake 2200 ft braided nylon 160 lb line manual tow drum foot brake new specially engineered motor much capable drum speeds 5000 rpm launching 3 meter sailplane ijchoose speed select pulleys j% launcha minute flights use companion RETRIEVER $250 Electrics/Kopski Continued page 133 Im convinced both planes good candidate designs Electric structures must beefed up lightness Personally felt terrible because somehow failed convey importance lightweight flying friendnot once twice Being determined stal wart modeler now off finishing two electric-powered Old-Timers Buzzard Bombshell Playboy Remember what said earlier series suggest thinking terms quarter ouncesfour make up ounce four make up quarter pounder Playboy Old-Timer Vital Statistics Wing styleElliptical tips Wingspan68 Wing chord constant9/2 Wing area planform576 sq DihedralPoly Wing frame weight4 Oz DAVE V SYSTEMS CORPOR ION ONE WOOD LANE MALVERNPA19355 215644-0692 Write call information Wing weight covered6 oz AirfoilUndercambered Tail assemblyBuilt-up Tail weight covered11/2 OZ Fuselage construction uilt-up stick Fuselage weight covered 31/3 OZ RadioThree channels used Controls .. RudElev ON/OFF Mot Radio battery250 mAh Radio weight6/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorLeisure LT-50 DriveLeisure 251 gear Prop10-6 11-6 Mot gear prop weight7/2 Oz Misc weightApprox1 2 oz Total plane weight41 oz Power system weight20 oz Wing loading1O/4oz/sq ft need new timers fly like plane second installment Planes Flying next month 11 look some ways build strong lightweight model structures Therell some rules thumb will help maximize Electric achievementand some thoughts what plane choose Meanwhile please direct comments questions SASE author Bob Kopski 25 West End Dr Lansdale PA 19446 RC Scale/Wischers Continued oaoe 47 made exclusively model cant used another plane Too much lost model isnt rebuilt large investment time money normal Scale modeling makes sense expend effort direction preservation No 1 admonition make certain good battery life before flying session since batteries common source problems lead air plane damage Cyclers have place arent really insurance against failure much inclined rely upon expanded-scale voltmeter resistance load quick battery check first time voltmeter needle drops sud denly doesnt come up proper level good Scale model will have saved possible destruction next flight Overworked receiver cells carrying load swarm servos subject vibration weak link RC sys tem Using larger-capacity cells isnt solu tion because dead cell drops voltage below requirements Larger cells per mit flights larger servos 18 Scale airplanes nine flown regu larly have same charging jack sake convenience Deans-type socket switch wiring harness Plug ging meter simple matter leaves no excuse omitting check same meter can used checking trans mitter batteries peace mind alone its worth $16 price Tower Hobbies Second importance models bal ance point Tail-heavy models can flown incidence angles wing stabilizer properly set up burden controlling such unstable beast too great experienced fliers nose-heavy model may WING SPAN4 WING AREA198 51 ENGINE15 WEIGHT34 IS Babe body loan wing sheeting die Cut formert rolled planS 2 nSf. 15 HIGHLY AEROBATIC DESIGNED Weller Nu Dentouk Jr PEPPERMINT PATTIE 15 STINGER II CMASTER KJT Div BAR/RICH SALES CO 2 FAIRWAY-HANNIBAL M0834G1314/221 8853 WING SPAN 30 WING AREABOA sqin ENGINE45 EIGHT5s balsa unstractiOn die Cut lornCrs ribs 2shts InlI Claw plans Good ground Seedling gaelIc lending good first bipe FU LLY AEROB ATIC NEW R/C BOOKLET Answers questions often asked want get started R/C flying PLUS troduces best airplane start GOLDEN FALCON receive Copy ____________ SEND $200 TO ST CROIX OF PARK FALLS LTD PO Box 279P Park Falls WI 54552 136 Model Aviation batter inc1d * plus shipping
Edition: Model Aviation - 1984/03
Page Numbers: 40, 41, 42, 43, 44, 132, 133, 136
II YOLfd never Know tnai mis picmur iuy e Trockels taken nervous day author Reason First IligIlts 01 flis i- LUD iii progress As turned out plane flew off board J-3 now has variable throttle controlbut didnt back 1979 firstflight day snapped gliding sweet three-point landing power off plane real crowd charmer Planes flying months topic author describes detail what works him examples what should work com plete charts record history own overall flying activity flight-time performances four basic model types electric motor power theme runs throughout successful models have strong lightweight structures Part 7 EBob Kopski IN THIS SECTION next Ill try bring together often promised past issues youve following series time finish next months segment should well-equipped way experiencing first-time continuing Electric successwith under standing Its what call Electric Elation Four electrifying profiles success Long ago Part I took strong issue some common misconceptions electricpowered flying too difficult too heavy fly well doesnt have enough power offers too short flight month Im going take allencompassing swipe false impres sions presenting array hard data four different Electric airplanes suc cess stories include powered glider aerobatics type Sport Scale OldTimer should cover majority reader interests relatively simple airplanesno complicated high-technology machines beyond reach average modeler data mentioned include information hundreds flights planes As read will see histograms flight time performance no wild claims particular vital statistics planes involved Later well look some rules-of-thumb apply easy guidelines can apply achieve same satisfying gratifying Elec tric success An electric year Before get de tails planes let describe kind Nostalgic Playboy Cabin recalls everything trom yesteryear except spark goo gas engine Its transparent yellow MonoKote cov ering glistens sun showing off interesting structure Side windows clear MonoKote Front windshield open cooling air 40 MnI Aviation flying relevant because Im author because basis performance information presented earlier section t mentioned Im basically sport flier Other some friendly club fun fly events no com petitive flying Also live fly south eastern Pennsylvania makes subject terms conditions four-season year Although club Keystone RC Club flies year round moderated proviso weather permitting fact great percentage aero exploits takes place about six seven months given year Obviously flying done summer least winter demonstrated Fig histogram flights month 1982 chose graph 1982 because last complete year have data 1983 still progress written Fig clearly shows Electric flights occur As general rule no reason cannot fly Electrics year round far equipment goes its matter climate personal desire de termination craziness Along line KRC holds its annual First Frosty Fingers Fun Fly January 1 no matter what weather evident data format plane performance generally bet ter respects cooler drier months thats peculiar Electrics Lets break flight-year' profile down little Being sport flier fly its enjoyable convenient Specifically find evenings weekend mornings gratifying relevant because best thermal conditions part activity part data have collected Thus can safely view happy Electric flyin facts herein being factual conservative well nothing contrived Good bad flights alike graphed can confidently read see yourself what Electric performance can like can compare experiences ones youve heard about comment about things may hear flight watch always seems either too short too long depending upon point being made way flight times shown clocked launch landing nearest second However purposes simplicity graphing times shown rounded larger fractions minute Profile 1 powered glider Ive frequently mentioned Spectra design first performance profile well look Spectra-Soar glider member Spectra family Recall Part aspect Spectra design versatility different electric power systems can have used model Remember view what follows example nothing magical about Spectra Most planes similar charac teristics should perform comparably first tangible lesson 'what flies way another involves virtually everything written far series Fig 2 composite histogram two Spectra-Soars Together 283 flights charted 1982 1983 date should perfectly clear design 12 13-mm airplane average no ther mals course some longer flights shown thermal-assisted fact some long off graphs scale Some flights short test hops quickies end day vast majority flights piled up middle chart ones count Theyre ones should able equal time No adver tising hype friends just facts Lets look some other things Fig 2 Spectra-Soar #1 #2 belongs friend Spectra #2 data included just prove can exhibit same nominal performance However since has accumulated data lets look closely Notice 1983 year-to-date data plotted directly top flight infor mation 1982 peak essentially same fashion 165 data points flights plotted 1982 83 flights 1983 no different character means after first group 165 battery performance remained exactly same next 83 flightson premise total flight time average gauge battery performance clearly supportive position Part 4 bat teries last hundreds flights given proper care Now big news data accumu lated Spectra #1 five different motor types using same battery six 12 Ah cells motors used equally same number flights basically no difference total average flight time among motors some motor/prop combinations burned power climbed ag gressively shorter time total flight times less same preceding paragraph heavy stuff friend may want read again effect saying no matter FArh IQSU Al Fig 2 shows cnaracterstics two Spectras authors identified No 1 text the right John Hickeys Spectra other V-tail Six varia tions used members KRC Model convenient size transporting inexpensive motor system provides plenty power Chart shows provides satisfying flights all-white clean-lined Persuader design convinces people Electric can Pattern aerobatics pretty well planes performance has never drawn criticism instead has re ceived plenty acknowledgements holds KRCs record rolls-per-minute FIGURE ONE 1982 ELECTRIC FLIGHT PROFILE FOR B KOPSKI 120 100 80 60 40 U CD Li Li 0 w -m z 20 0 u J F Spectra-Soar Powered Glider Vital Statistics Wing styleRectangular Wingspan67 Wing chord constant8 Wing area planform536 sq DihedralPoly Wing frame weight45 oz Wing weight covered6/3 OZ AirfoilFlat bot 12% turbulated Tail assemblySheet balsa Tail weight covered1 oz Fuselage construction sheet box Fuselage weight complete3 oz RadioThree channels used Controls Elev Rud Mot ON/OFF prop stop Radio battery250 mAh Radio weight7 oz Motor batterySix 1 2 Ah cells Motor controlMicroswitch Battery weight12 oz Motor Various Astro Leisure Mabuchi DriveDirect PropsVarious 6-4 8-6 Motor/prop weight6-7/2 OZ Misc weightApprox 2 oz Total plane weight3839/z oz Power system weightt920/2 oz Wing loadingl0--1O5 oz/sq ft what appropriate motor suitable prop use plane flies about same total time same battery charge Thats just true plane should hold true similar plane remember Part 4s discussion about batteries described ways charging including conservative charging technique method does fill battery maximum stops short about 20% average 25 flight data Fig 1 such charging other examples course longer flights would result used digi tal charging Ive said before dont care clear kind airplane charge fly will keep air almost continuously Oh such Electric Elation Now lets take detailed look Spectra-Soar Remember plane similar example should perform comparably FIGURE TWO SPECTRA SOAR FLIGHT TIME HISTOGRAM D 1982SPECTRA #1 1983 TO DAIJ E SPECTRA #2 TOTAL FLIGHTS 283 II III II I 8 9 10 II 12 13 MINUTES II I I I 4567 7 ~FLEJi 1111111 14 15 16 17 18 19 20 21 So much fine details Lets step back look bigger picture Par ticulars stand out tabulation clude fact power system about half total plane weight typical number Also battery about 30% total plane itself light also strong holds record consecutive loops KRCa real wing-tester wing loading typical electric-powered gliders Ive seen Actually wing loading easily improved wing area can increased far rapidly corresponding increase overall weight statistics key plane light need lightness license weakness plane must have strength right places overall dur ability survive year after year routine handling Later well see some ways help accomplish Now lets get back motors props motor/prop combinations used model include two Astro OSs pn 2107 now discontinued 7-6 8-4 Top Flight Nylon Astro 075 XL 7-4 7-6 8-4 Top Flight Nylon last two much too large Leisure LT-50 Pattern Wind 6-4 7-6 Top Flight Nylon 7-6 too large Cox Gray Mabuchi RS-5505-6530 Mabuchi 550S both using 7-6 8-4 props practical purposes total flight times combinations virtually same As additional point interest combinations Spectra friends Spectra #2 has flown original Astro 05 pn 2107 economy motor thats perfectly satisfactory application 2107 originally marketed eight-cell 55 Ah battery GRAPH REPRESENTS TOTAL OF 511 FLIGHTS OF 8 ELECTRICS VIMr A50ND MONTH U Iz CD - Li LJ -o w -m -z 20 IS 10 5 0 swinging 6-4 prop documented flight performance Spectra #2 six 12 Ah cells larger props As esti mate based other planes experience eight-cell 55 Ah pack would result Spectra-Soar flights about 6 7 mm Profile 2 aerobatic plane some reason measure Electrics model ers minds well poorly Pattern flying particularly curious because part people Ive seen Electrics arent aerobatics dont seem least bit concerned having fun blowing holes sky Nevertheless find phase flying liking well take closer look application First what Ive seen Elec tric no match conventional glowpowered Pattern planes least very long flights Thus youre thinking ing what big boys forget other hand relatively simple aero batics 5 mm liking read What relatively simple aerobatics Ill list what have either seen done myself inside outside loops aileron rolls sustained inverted flight spins knife edge Immelmanns hammerheads split-Ss long answer de picted Fig 3 Fig 3 histogram flight time number flights Persuader name has purpose plane convinces people Unlike glider flight time aerobatic plane much longer useful motor run time Such plane depends continuous power perform Also un like glider motor prop choices limited because efficient power deliv ery required desired flight charac teristics given power system aerobatic plane flight time determined large extent nature flight con stant maneuvering flight windy condi tions very hot humid air average power consumption relatively high contrasts power consumption flying done straightaway speed increases prop unloads cur rent drain reduced flights longer Putting another way longer flights will result simple up-and-down-the-field flight aerobatics listed previ ously mind lets examine Fig 3 Notice general lack peaking flatter broader shape histogram en velope like think plane 4 5-mm machine depending mood because influences fly course data conclusions assume equal charges flight data shown essentially flights resulting conservative charge limited number cases chose digital charge resulting flight about /2 mm longer apparent average 4 mm relatively 1983 DATE FIGURE THREE PERSUADER FLIGHT TIME HISTOGRAM 10 1982 I C -J LL 5 0 w zri 0Ii 1020304050II62b30405 345 MINUTES 25 20 U 15 CD U 0 U 10 z 5 10 20 30 40 50 6 FIGURE FOUR 1980 THRU 1983 TO DATE J-3 SPORT SCALE FLIGHT PROFILE II 3456 MINUTES few shorter flights graphed almost due either 'short charge' purposely-terminated flight Unlike Spectra Persuader has flown Cobalt 05 six-cell 12 Ah battery say workable power system Persuader derived Wasp published Jim Zarembski RCM have seen several Wasps KRC Electric Fly events powered both Astro Cobalt OSs Leisure LT-50s both impressive performance fact Jim lists several candi n II'I' 78910 date power systems Wasp plans Since Ive used combination above can report Incidentally Persuader will fly aerobatic maneuvers listed Since has no rudder control maneuvers requiring course out Since Ive now begun talk about makeup plane lets move Vital Statistics Persuader As case Spectra Persuader example Similar designs should perform comparably Continued page 44 nO4 AVI FIGURE FIVE PLAYBOY OLD-TIMER FLIGHT PROFILE 6NOTE NOT SHOWN ARE FLIGHTS 15OF 45 MIN 31 SEC AND CD37 MIN 39 SEC J4 CA LA3 0 U2 zII 0FJF1F1 0 10 02530 MINUTES FOUR CYCLE ENGINE MOUNTS High tensile aluminum alloy Precision machined polished Hardened socket cap screws included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENYA 601295 No 31995 ENYA 901295 No 31452 HP VT 21750 No 31644 HP VT 49895 No 31654 MAX FS 40895 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201995 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45895 No 32195 SAITO FA 1201995 AT MOST HOBBY SHOPS OR OROER DIRECT Send 100 tor 12 page Illustrated catalog Handy Tools Precision Sanding ALUMINUM EXTRUSION SANDING BLOCKADJUSTABLE TENSION use RUFF-STUFF82HAND BELT SANDER Self adhesive sandpaperFIRMLY HOLDS PAPER Makes Sanding InSmallFOR EASIER SANDING Areas Snap$220 Wont Wear Out~~A ed flats curves Handy Use Handy Hold 11 inch $235 Easy Use 22 Inch sasoextra strips $1 40 APPLIED DESIGN CORPAdd 20% torcatalog 738 PENN STREET EL SEGUNDO CA 90245 torPoatago Persuader Aerobatic Vital Statistics Wing styleRectangular Wingspan37 Wing chord constant8 Wing area planform296 sq DihedralNone Wing frame weight3 oz Wing weight covered4 oz Airfoil . NACA 2410 semi-sym 10% Tail assemblySheet balsa Tail weight coveredNo data Fuselage construction . sheet box Fuselage weightNo data RadioThree channels used ControlsEIev Ail Mot ON/OFF Radio battery70 mAh Radio weight5/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorAstro Cobalt 05 DriveDirect Prop7-6 Top Flight Nylon Motor/prop weight6 oz Misc weightApprox 2 oz Total plane weight33 oz Power system weight19 oz Wing loading16 oz/sq ft Again basic airplane very light about 85 oz structure theless strong durable must withstand aerobatics survive general flying landing handling Notice power system about 58% total weight plane itself less 26% Later will see quantitatively important weight really As special point interest notice mention 70 mAh radio battery con sists four cells removed General Electric 9V Ni-Cd consumer-grade battery provides enough power four flights stop four discharge re charge field As writing have 436 flights pack first used earlier aerobatic plane before finding home Persuader may very well have read about heard better performance described have Im sure exists other extreme Im sure have impression Electric gliders What presented pro file real workable electric-powered aerobatic plane Theres no magic involved anyone used flying prop will have learn fly wing Nevertheless should able match kind performance beat please let know remember Im easily impressed lot shouting hand-waving about great some flight seemed Theres too much sort prop wash already Instead come 1984 Electric Fly persuade Profile 3 Sport Scale perhaps ming Electric applications Continued page 132 AALAA-I- Electric flight challenge sport flier competitor alike Watts Up introduction should gratifying Happy landings Radio Technique/Myers Continued page 39 ing microscopic whiskers through sulating paper can blow out whis kers high-voltage charge really trust cells afterward dont So away workbench lot Chargemaster may prove fine tool Ace RC Inc Box 51 lE Higginsville MO 64037 George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 [ writing advertisers mention t read about ModI Aviation J-3 has proven over years real crowd pleaserprobably because its good old J-3 fact touches ob servers plane built winter 1978-79 first flown March 3 latter year didnt know till later Bob Boucher Astro Flight design ing Porterfield same time two planes very similar date J-3 has accumulated 334 flights drop oil has soaked 150 depicted Fig 4 Prior 1980 keeping record flight time date number flights thats reason about half plotted Fig 4 obvious five-mm airplane can see vital statistics what details Heres some information about plane J-3 scratch-built using Sig plans guideline Since electricpowered knew plane itself lightweight rugged kit version glow engine would set about redrawing plans choosing construc tion techniques wood sizes consistent application also changed air foil 12/2% flat-bottom section Dihedral added lieu ailerons Result real charmer Admittedly 1-3 fair-weather flier does handle wind well defi nitely fun fly calm air typical flight starts small amount ground handling followed taxi takeoff Fol lowing climb-out back off proportional throttle cruise around Flybys snapbeautiful experience plane pussycat handling several times Ive nearly hypnotized myself flying myself Usually Ill some touch-and-goes two inside loops playing throttle control needed plane glides nicely note some longer lift-assisted flight times Fig 4 generally keep power whole flight varying amount de sired effect About third time have enough power left after landing taxi back pit area Otherwise power out have bring back dead-stick 1-3 good example inadequate battery cooling Im fourth battery heat reason time design construction what looked like good installation cooling has proved adequate Whatever knowledge may have Electrics has come cheaply 15-size motor used plane new version plane new so-called black back 15 current model Astro 15 rather different motor Ferrite 15 uses 12 cells 12 Ah may install someday get longer flights overall weight will increase about 9 oz estimate flight time should increase about 8-9 mm Look over vitals get general idea candidate designs around would perform comparably would require some modeling effort make suitable electric power J-3 example Astro Porterfield 132 Model Aviation Watts Up/MarronElectrics/Kopski Continued page 130 Continued paqe 44 jSSOATES INCNEW MO 13 N IS Dont bee stung AIDS CLOUD WAYHAYWARD CA 945S OS4ONCsalaENYA GUARANTEED CY NO 5310 Os l2O4cy NO 5317 HOT SHOT Hor~US PAT 4405890 Hand held rechargeable glow plug energizer size engine uses gtow plug Small enough carry yoijr shirt pocket Makes dry cell batteries power losing wires thing ot past Easy attachment cowd engines Reinforced extra hard use Can charged upto 1000 times Uses HEAD LOCK glow plug connector MODEL PRODUCTS CORP positive corinec tion tothe glow plug 90 day unconditional guarantee plus limited warranty up year Complete instructions charger Available dealer order direct Visa Mastercard accepted Add Si 50 postage power convenience $1995 Without charger $1595 b & r Hobbies PO Box 192 Oscoda MI 48750 [517] 7393549 Making Leisure Time Enjoyable excellent kit example way opinion roughly size plane power system about minimum neces sary reliable ground handling takeoff grassy fields under varying weather con ditions Except some occasional tail dragger-itis plane always gets off J-3 Sport Scale Vital Statistics Wing styleScale Wingspan70/2 Wing chord constant10 Wing area planform sq Dihedral5 deg/panel Wing frame weight6/4 oz Wing weight covered10% oz Airfoil12% flat bottom Tail assemblyBuilt-up Tail weight covered2 oz Fuselage construction tick built-up Fuselage weight No data Radio Three channels used Controls Rud Elev Mot Radio battery 250 mAb Radio weight 8 oz Motor battery 16 cells 55 Ah Motor control Variable speed Battery weight 16 oz Motor Astro 15 reducer Drive Belt Prop Top Flight 12-8 wood Mot Red prop weight 13 oz Misc weightApprox 1 2 oz Total plane weight68 oz Power system weight .. 30 oz approx Wing loading14 ozIsq ft Otherincluded above Wing struts Hdwr1 oz Wheels Trexler lOG2 oz Comp LG Assy4 oz Again same message plane must lightweight Please dont confuse being weak fragile such need notbe case particular model has over 300 flights approaching its fifth birthday 1-3 has its share Profile 4 Old-Timer recent plane Playboy Cabin Old-Timer built Leisure kit am ordinarily kit builder wanted new plane hurry Ive wanting Old-Timer years natural As writing plane about two months old dont have nearly much accumulated flight data other examples plane perfectly delightful fly product review product review product review modeler likes complete sets tools very good value selec tion six screwdriver sizes included set hex-nut drivers precision wrench es hex-nut key drivers assorted Phillipshead screwdrivers sizes convenient modeling purposes Altogether get 21 pieces plus handy tray $700 product review product review product review Old-Timers everyones preference everyone seems enjoy watch ing fly currently holds KRC Longest Flight Record 45 mm 31 sec can see Fig 5 charac teristically 10 16-mm plane suspect accumulate flights peak will reached flight profile will probably fall around 13 mm plane handles wind surprisingly well its light wing loading poly dihedral undercambered airfoil Lack ing steerable wheel plane doesnt much ground will take off unassisted time low grass some headwind ground roll ap proaches zero enough wind some tricky controlling plane will fly back wardswith no bad tendencies Like gliders would normally think putting variable-speed control OldTimer No doubt because Free Flight conditioning just get thing up high possible quickly possible However Im stuff anymore no fields now wish built proportional motor control Having vari able throttle adds new dimension already enjoyable airplane found out 1-3 first flown OFF-LO HI power control ways Playboy similar excellent candidate feature course youre Elec tric O-T competition just stay ON-OFF motor control As before vital statistics give some detail Again lightweight oper ative word cannot stress point too much have seen magnificentlyconstructed Electric Kadet equally supurb Flyline Megowcoupe truly fine craftsmanship same modeler fail fly solely because planes too heavy say least planes bit over-embellished extra struc ture lots heavy wood pieces various nif ty fittings Continued page 136 March 1984 133 ALL SHEET ONE PIECE AAA GRADE KILN DRIED SANDED TO CLOSE TOLERANCES PED 100% 17318x1112 261/2x2 30 37 rough landings aborted takeoffs hectic fun fly events hangar dings once spun down because ran radio battery down Its its third set wheels Ive used test purposes carry dead weights 8-oz I-lb iron blocks Other pilots have flown including young boy never held transmitter Obviously has taken much abuse Screwdriver Tool Set @ $700 Polks Model-Craft Hobbies Dept 2084 346 Bergen Ave Jersey City NJ 07304 tel 20 1/3328100 POWRZOOM winch serious flyer demands extraordinary launching power sailplane particularly F3Bscale cross-country Included antikiting/ antibacklash brake 2200 ft braided nylon 160 lb line manual tow drum foot brake new specially engineered motor much capable drum speeds 5000 rpm launching 3 meter sailplane ijchoose speed select pulleys j% launcha minute flights use companion RETRIEVER $250 Electrics/Kopski Continued page 133 Im convinced both planes good candidate designs Electric structures must beefed up lightness Personally felt terrible because somehow failed convey importance lightweight flying friendnot once twice Being determined stal wart modeler now off finishing two electric-powered Old-Timers Buzzard Bombshell Playboy Remember what said earlier series suggest thinking terms quarter ouncesfour make up ounce four make up quarter pounder Playboy Old-Timer Vital Statistics Wing styleElliptical tips Wingspan68 Wing chord constant9/2 Wing area planform576 sq DihedralPoly Wing frame weight4 Oz DAVE V SYSTEMS CORPOR ION ONE WOOD LANE MALVERNPA19355 215644-0692 Write call information Wing weight covered6 oz AirfoilUndercambered Tail assemblyBuilt-up Tail weight covered11/2 OZ Fuselage construction uilt-up stick Fuselage weight covered 31/3 OZ RadioThree channels used Controls .. RudElev ON/OFF Mot Radio battery250 mAh Radio weight6/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorLeisure LT-50 DriveLeisure 251 gear Prop10-6 11-6 Mot gear prop weight7/2 Oz Misc weightApprox1 2 oz Total plane weight41 oz Power system weight20 oz Wing loading1O/4oz/sq ft need new timers fly like plane second installment Planes Flying next month 11 look some ways build strong lightweight model structures Therell some rules thumb will help maximize Electric achievementand some thoughts what plane choose Meanwhile please direct comments questions SASE author Bob Kopski 25 West End Dr Lansdale PA 19446 RC Scale/Wischers Continued oaoe 47 made exclusively model cant used another plane Too much lost model isnt rebuilt large investment time money normal Scale modeling makes sense expend effort direction preservation No 1 admonition make certain good battery life before flying session since batteries common source problems lead air plane damage Cyclers have place arent really insurance against failure much inclined rely upon expanded-scale voltmeter resistance load quick battery check first time voltmeter needle drops sud denly doesnt come up proper level good Scale model will have saved possible destruction next flight Overworked receiver cells carrying load swarm servos subject vibration weak link RC sys tem Using larger-capacity cells isnt solu tion because dead cell drops voltage below requirements Larger cells per mit flights larger servos 18 Scale airplanes nine flown regu larly have same charging jack sake convenience Deans-type socket switch wiring harness Plug ging meter simple matter leaves no excuse omitting check same meter can used checking trans mitter batteries peace mind alone its worth $16 price Tower Hobbies Second importance models bal ance point Tail-heavy models can flown incidence angles wing stabilizer properly set up burden controlling such unstable beast too great experienced fliers nose-heavy model may WING SPAN4 WING AREA198 51 ENGINE15 WEIGHT34 IS Babe body loan wing sheeting die Cut formert rolled planS 2 nSf. 15 HIGHLY AEROBATIC DESIGNED Weller Nu Dentouk Jr PEPPERMINT PATTIE 15 STINGER II CMASTER KJT Div BAR/RICH SALES CO 2 FAIRWAY-HANNIBAL M0834G1314/221 8853 WING SPAN 30 WING AREABOA sqin ENGINE45 EIGHT5s balsa unstractiOn die Cut lornCrs ribs 2shts InlI Claw plans Good ground Seedling gaelIc lending good first bipe FU LLY AEROB ATIC NEW R/C BOOKLET Answers questions often asked want get started R/C flying PLUS troduces best airplane start GOLDEN FALCON receive Copy ____________ SEND $200 TO ST CROIX OF PARK FALLS LTD PO Box 279P Park Falls WI 54552 136 Model Aviation batter inc1d * plus shipping
Edition: Model Aviation - 1984/03
Page Numbers: 40, 41, 42, 43, 44, 132, 133, 136
II YOLfd never Know tnai mis picmur iuy e Trockels taken nervous day author Reason First IligIlts 01 flis i- LUD iii progress As turned out plane flew off board J-3 now has variable throttle controlbut didnt back 1979 firstflight day snapped gliding sweet three-point landing power off plane real crowd charmer Planes flying months topic author describes detail what works him examples what should work com plete charts record history own overall flying activity flight-time performances four basic model types electric motor power theme runs throughout successful models have strong lightweight structures Part 7 EBob Kopski IN THIS SECTION next Ill try bring together often promised past issues youve following series time finish next months segment should well-equipped way experiencing first-time continuing Electric successwith under standing Its what call Electric Elation Four electrifying profiles success Long ago Part I took strong issue some common misconceptions electricpowered flying too difficult too heavy fly well doesnt have enough power offers too short flight month Im going take allencompassing swipe false impres sions presenting array hard data four different Electric airplanes suc cess stories include powered glider aerobatics type Sport Scale OldTimer should cover majority reader interests relatively simple airplanesno complicated high-technology machines beyond reach average modeler data mentioned include information hundreds flights planes As read will see histograms flight time performance no wild claims particular vital statistics planes involved Later well look some rules-of-thumb apply easy guidelines can apply achieve same satisfying gratifying Elec tric success An electric year Before get de tails planes let describe kind Nostalgic Playboy Cabin recalls everything trom yesteryear except spark goo gas engine Its transparent yellow MonoKote cov ering glistens sun showing off interesting structure Side windows clear MonoKote Front windshield open cooling air 40 MnI Aviation flying relevant because Im author because basis performance information presented earlier section t mentioned Im basically sport flier Other some friendly club fun fly events no com petitive flying Also live fly south eastern Pennsylvania makes subject terms conditions four-season year Although club Keystone RC Club flies year round moderated proviso weather permitting fact great percentage aero exploits takes place about six seven months given year Obviously flying done summer least winter demonstrated Fig histogram flights month 1982 chose graph 1982 because last complete year have data 1983 still progress written Fig clearly shows Electric flights occur As general rule no reason cannot fly Electrics year round far equipment goes its matter climate personal desire de termination craziness Along line KRC holds its annual First Frosty Fingers Fun Fly January 1 no matter what weather evident data format plane performance generally bet ter respects cooler drier months thats peculiar Electrics Lets break flight-year' profile down little Being sport flier fly its enjoyable convenient Specifically find evenings weekend mornings gratifying relevant because best thermal conditions part activity part data have collected Thus can safely view happy Electric flyin facts herein being factual conservative well nothing contrived Good bad flights alike graphed can confidently read see yourself what Electric performance can like can compare experiences ones youve heard about comment about things may hear flight watch always seems either too short too long depending upon point being made way flight times shown clocked launch landing nearest second However purposes simplicity graphing times shown rounded larger fractions minute Profile 1 powered glider Ive frequently mentioned Spectra design first performance profile well look Spectra-Soar glider member Spectra family Recall Part aspect Spectra design versatility different electric power systems can have used model Remember view what follows example nothing magical about Spectra Most planes similar charac teristics should perform comparably first tangible lesson 'what flies way another involves virtually everything written far series Fig 2 composite histogram two Spectra-Soars Together 283 flights charted 1982 1983 date should perfectly clear design 12 13-mm airplane average no ther mals course some longer flights shown thermal-assisted fact some long off graphs scale Some flights short test hops quickies end day vast majority flights piled up middle chart ones count Theyre ones should able equal time No adver tising hype friends just facts Lets look some other things Fig 2 Spectra-Soar #1 #2 belongs friend Spectra #2 data included just prove can exhibit same nominal performance However since has accumulated data lets look closely Notice 1983 year-to-date data plotted directly top flight infor mation 1982 peak essentially same fashion 165 data points flights plotted 1982 83 flights 1983 no different character means after first group 165 battery performance remained exactly same next 83 flightson premise total flight time average gauge battery performance clearly supportive position Part 4 bat teries last hundreds flights given proper care Now big news data accumu lated Spectra #1 five different motor types using same battery six 12 Ah cells motors used equally same number flights basically no difference total average flight time among motors some motor/prop combinations burned power climbed ag gressively shorter time total flight times less same preceding paragraph heavy stuff friend may want read again effect saying no matter FArh IQSU Al Fig 2 shows cnaracterstics two Spectras authors identified No 1 text the right John Hickeys Spectra other V-tail Six varia tions used members KRC Model convenient size transporting inexpensive motor system provides plenty power Chart shows provides satisfying flights all-white clean-lined Persuader design convinces people Electric can Pattern aerobatics pretty well planes performance has never drawn criticism instead has re ceived plenty acknowledgements holds KRCs record rolls-per-minute FIGURE ONE 1982 ELECTRIC FLIGHT PROFILE FOR B KOPSKI 120 100 80 60 40 U CD Li Li 0 w -m z 20 0 u J F Spectra-Soar Powered Glider Vital Statistics Wing styleRectangular Wingspan67 Wing chord constant8 Wing area planform536 sq DihedralPoly Wing frame weight45 oz Wing weight covered6/3 OZ AirfoilFlat bot 12% turbulated Tail assemblySheet balsa Tail weight covered1 oz Fuselage construction sheet box Fuselage weight complete3 oz RadioThree channels used Controls Elev Rud Mot ON/OFF prop stop Radio battery250 mAh Radio weight7 oz Motor batterySix 1 2 Ah cells Motor controlMicroswitch Battery weight12 oz Motor Various Astro Leisure Mabuchi DriveDirect PropsVarious 6-4 8-6 Motor/prop weight6-7/2 OZ Misc weightApprox 2 oz Total plane weight3839/z oz Power system weightt920/2 oz Wing loadingl0--1O5 oz/sq ft what appropriate motor suitable prop use plane flies about same total time same battery charge Thats just true plane should hold true similar plane remember Part 4s discussion about batteries described ways charging including conservative charging technique method does fill battery maximum stops short about 20% average 25 flight data Fig 1 such charging other examples course longer flights would result used digi tal charging Ive said before dont care clear kind airplane charge fly will keep air almost continuously Oh such Electric Elation Now lets take detailed look Spectra-Soar Remember plane similar example should perform comparably FIGURE TWO SPECTRA SOAR FLIGHT TIME HISTOGRAM D 1982SPECTRA #1 1983 TO DAIJ E SPECTRA #2 TOTAL FLIGHTS 283 II III II I 8 9 10 II 12 13 MINUTES II I I I 4567 7 ~FLEJi 1111111 14 15 16 17 18 19 20 21 So much fine details Lets step back look bigger picture Par ticulars stand out tabulation clude fact power system about half total plane weight typical number Also battery about 30% total plane itself light also strong holds record consecutive loops KRCa real wing-tester wing loading typical electric-powered gliders Ive seen Actually wing loading easily improved wing area can increased far rapidly corresponding increase overall weight statistics key plane light need lightness license weakness plane must have strength right places overall dur ability survive year after year routine handling Later well see some ways help accomplish Now lets get back motors props motor/prop combinations used model include two Astro OSs pn 2107 now discontinued 7-6 8-4 Top Flight Nylon Astro 075 XL 7-4 7-6 8-4 Top Flight Nylon last two much too large Leisure LT-50 Pattern Wind 6-4 7-6 Top Flight Nylon 7-6 too large Cox Gray Mabuchi RS-5505-6530 Mabuchi 550S both using 7-6 8-4 props practical purposes total flight times combinations virtually same As additional point interest combinations Spectra friends Spectra #2 has flown original Astro 05 pn 2107 economy motor thats perfectly satisfactory application 2107 originally marketed eight-cell 55 Ah battery GRAPH REPRESENTS TOTAL OF 511 FLIGHTS OF 8 ELECTRICS VIMr A50ND MONTH U Iz CD - Li LJ -o w -m -z 20 IS 10 5 0 swinging 6-4 prop documented flight performance Spectra #2 six 12 Ah cells larger props As esti mate based other planes experience eight-cell 55 Ah pack would result Spectra-Soar flights about 6 7 mm Profile 2 aerobatic plane some reason measure Electrics model ers minds well poorly Pattern flying particularly curious because part people Ive seen Electrics arent aerobatics dont seem least bit concerned having fun blowing holes sky Nevertheless find phase flying liking well take closer look application First what Ive seen Elec tric no match conventional glowpowered Pattern planes least very long flights Thus youre thinking ing what big boys forget other hand relatively simple aero batics 5 mm liking read What relatively simple aerobatics Ill list what have either seen done myself inside outside loops aileron rolls sustained inverted flight spins knife edge Immelmanns hammerheads split-Ss long answer de picted Fig 3 Fig 3 histogram flight time number flights Persuader name has purpose plane convinces people Unlike glider flight time aerobatic plane much longer useful motor run time Such plane depends continuous power perform Also un like glider motor prop choices limited because efficient power deliv ery required desired flight charac teristics given power system aerobatic plane flight time determined large extent nature flight con stant maneuvering flight windy condi tions very hot humid air average power consumption relatively high contrasts power consumption flying done straightaway speed increases prop unloads cur rent drain reduced flights longer Putting another way longer flights will result simple up-and-down-the-field flight aerobatics listed previ ously mind lets examine Fig 3 Notice general lack peaking flatter broader shape histogram en velope like think plane 4 5-mm machine depending mood because influences fly course data conclusions assume equal charges flight data shown essentially flights resulting conservative charge limited number cases chose digital charge resulting flight about /2 mm longer apparent average 4 mm relatively 1983 DATE FIGURE THREE PERSUADER FLIGHT TIME HISTOGRAM 10 1982 I C -J LL 5 0 w zri 0Ii 1020304050II62b30405 345 MINUTES 25 20 U 15 CD U 0 U 10 z 5 10 20 30 40 50 6 FIGURE FOUR 1980 THRU 1983 TO DATE J-3 SPORT SCALE FLIGHT PROFILE II 3456 MINUTES few shorter flights graphed almost due either 'short charge' purposely-terminated flight Unlike Spectra Persuader has flown Cobalt 05 six-cell 12 Ah battery say workable power system Persuader derived Wasp published Jim Zarembski RCM have seen several Wasps KRC Electric Fly events powered both Astro Cobalt OSs Leisure LT-50s both impressive performance fact Jim lists several candi n II'I' 78910 date power systems Wasp plans Since Ive used combination above can report Incidentally Persuader will fly aerobatic maneuvers listed Since has no rudder control maneuvers requiring course out Since Ive now begun talk about makeup plane lets move Vital Statistics Persuader As case Spectra Persuader example Similar designs should perform comparably Continued page 44 nO4 AVI FIGURE FIVE PLAYBOY OLD-TIMER FLIGHT PROFILE 6NOTE NOT SHOWN ARE FLIGHTS 15OF 45 MIN 31 SEC AND CD37 MIN 39 SEC J4 CA LA3 0 U2 zII 0FJF1F1 0 10 02530 MINUTES FOUR CYCLE ENGINE MOUNTS High tensile aluminum alloy Precision machined polished Hardened socket cap screws included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENYA 601295 No 31995 ENYA 901295 No 31452 HP VT 21750 No 31644 HP VT 49895 No 31654 MAX FS 40895 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201995 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45895 No 32195 SAITO FA 1201995 AT MOST HOBBY SHOPS OR OROER DIRECT Send 100 tor 12 page Illustrated catalog Handy Tools Precision Sanding ALUMINUM EXTRUSION SANDING BLOCKADJUSTABLE TENSION use RUFF-STUFF82HAND BELT SANDER Self adhesive sandpaperFIRMLY HOLDS PAPER Makes Sanding InSmallFOR EASIER SANDING Areas Snap$220 Wont Wear Out~~A ed flats curves Handy Use Handy Hold 11 inch $235 Easy Use 22 Inch sasoextra strips $1 40 APPLIED DESIGN CORPAdd 20% torcatalog 738 PENN STREET EL SEGUNDO CA 90245 torPoatago Persuader Aerobatic Vital Statistics Wing styleRectangular Wingspan37 Wing chord constant8 Wing area planform296 sq DihedralNone Wing frame weight3 oz Wing weight covered4 oz Airfoil . NACA 2410 semi-sym 10% Tail assemblySheet balsa Tail weight coveredNo data Fuselage construction . sheet box Fuselage weightNo data RadioThree channels used ControlsEIev Ail Mot ON/OFF Radio battery70 mAh Radio weight5/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorAstro Cobalt 05 DriveDirect Prop7-6 Top Flight Nylon Motor/prop weight6 oz Misc weightApprox 2 oz Total plane weight33 oz Power system weight19 oz Wing loading16 oz/sq ft Again basic airplane very light about 85 oz structure theless strong durable must withstand aerobatics survive general flying landing handling Notice power system about 58% total weight plane itself less 26% Later will see quantitatively important weight really As special point interest notice mention 70 mAh radio battery con sists four cells removed General Electric 9V Ni-Cd consumer-grade battery provides enough power four flights stop four discharge re charge field As writing have 436 flights pack first used earlier aerobatic plane before finding home Persuader may very well have read about heard better performance described have Im sure exists other extreme Im sure have impression Electric gliders What presented pro file real workable electric-powered aerobatic plane Theres no magic involved anyone used flying prop will have learn fly wing Nevertheless should able match kind performance beat please let know remember Im easily impressed lot shouting hand-waving about great some flight seemed Theres too much sort prop wash already Instead come 1984 Electric Fly persuade Profile 3 Sport Scale perhaps ming Electric applications Continued page 132 AALAA-I- Electric flight challenge sport flier competitor alike Watts Up introduction should gratifying Happy landings Radio Technique/Myers Continued page 39 ing microscopic whiskers through sulating paper can blow out whis kers high-voltage charge really trust cells afterward dont So away workbench lot Chargemaster may prove fine tool Ace RC Inc Box 51 lE Higginsville MO 64037 George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 [ writing advertisers mention t read about ModI Aviation J-3 has proven over years real crowd pleaserprobably because its good old J-3 fact touches ob servers plane built winter 1978-79 first flown March 3 latter year didnt know till later Bob Boucher Astro Flight design ing Porterfield same time two planes very similar date J-3 has accumulated 334 flights drop oil has soaked 150 depicted Fig 4 Prior 1980 keeping record flight time date number flights thats reason about half plotted Fig 4 obvious five-mm airplane can see vital statistics what details Heres some information about plane J-3 scratch-built using Sig plans guideline Since electricpowered knew plane itself lightweight rugged kit version glow engine would set about redrawing plans choosing construc tion techniques wood sizes consistent application also changed air foil 12/2% flat-bottom section Dihedral added lieu ailerons Result real charmer Admittedly 1-3 fair-weather flier does handle wind well defi nitely fun fly calm air typical flight starts small amount ground handling followed taxi takeoff Fol lowing climb-out back off proportional throttle cruise around Flybys snapbeautiful experience plane pussycat handling several times Ive nearly hypnotized myself flying myself Usually Ill some touch-and-goes two inside loops playing throttle control needed plane glides nicely note some longer lift-assisted flight times Fig 4 generally keep power whole flight varying amount de sired effect About third time have enough power left after landing taxi back pit area Otherwise power out have bring back dead-stick 1-3 good example inadequate battery cooling Im fourth battery heat reason time design construction what looked like good installation cooling has proved adequate Whatever knowledge may have Electrics has come cheaply 15-size motor used plane new version plane new so-called black back 15 current model Astro 15 rather different motor Ferrite 15 uses 12 cells 12 Ah may install someday get longer flights overall weight will increase about 9 oz estimate flight time should increase about 8-9 mm Look over vitals get general idea candidate designs around would perform comparably would require some modeling effort make suitable electric power J-3 example Astro Porterfield 132 Model Aviation Watts Up/MarronElectrics/Kopski Continued page 130 Continued paqe 44 jSSOATES INCNEW MO 13 N IS Dont bee stung AIDS CLOUD WAYHAYWARD CA 945S OS4ONCsalaENYA GUARANTEED CY NO 5310 Os l2O4cy NO 5317 HOT SHOT Hor~US PAT 4405890 Hand held rechargeable glow plug energizer size engine uses gtow plug Small enough carry yoijr shirt pocket Makes dry cell batteries power losing wires thing ot past Easy attachment cowd engines Reinforced extra hard use Can charged upto 1000 times Uses HEAD LOCK glow plug connector MODEL PRODUCTS CORP positive corinec tion tothe glow plug 90 day unconditional guarantee plus limited warranty up year Complete instructions charger Available dealer order direct Visa Mastercard accepted Add Si 50 postage power convenience $1995 Without charger $1595 b & r Hobbies PO Box 192 Oscoda MI 48750 [517] 7393549 Making Leisure Time Enjoyable excellent kit example way opinion roughly size plane power system about minimum neces sary reliable ground handling takeoff grassy fields under varying weather con ditions Except some occasional tail dragger-itis plane always gets off J-3 Sport Scale Vital Statistics Wing styleScale Wingspan70/2 Wing chord constant10 Wing area planform sq Dihedral5 deg/panel Wing frame weight6/4 oz Wing weight covered10% oz Airfoil12% flat bottom Tail assemblyBuilt-up Tail weight covered2 oz Fuselage construction tick built-up Fuselage weight No data Radio Three channels used Controls Rud Elev Mot Radio battery 250 mAb Radio weight 8 oz Motor battery 16 cells 55 Ah Motor control Variable speed Battery weight 16 oz Motor Astro 15 reducer Drive Belt Prop Top Flight 12-8 wood Mot Red prop weight 13 oz Misc weightApprox 1 2 oz Total plane weight68 oz Power system weight .. 30 oz approx Wing loading14 ozIsq ft Otherincluded above Wing struts Hdwr1 oz Wheels Trexler lOG2 oz Comp LG Assy4 oz Again same message plane must lightweight Please dont confuse being weak fragile such need notbe case particular model has over 300 flights approaching its fifth birthday 1-3 has its share Profile 4 Old-Timer recent plane Playboy Cabin Old-Timer built Leisure kit am ordinarily kit builder wanted new plane hurry Ive wanting Old-Timer years natural As writing plane about two months old dont have nearly much accumulated flight data other examples plane perfectly delightful fly product review product review product review modeler likes complete sets tools very good value selec tion six screwdriver sizes included set hex-nut drivers precision wrench es hex-nut key drivers assorted Phillipshead screwdrivers sizes convenient modeling purposes Altogether get 21 pieces plus handy tray $700 product review product review product review Old-Timers everyones preference everyone seems enjoy watch ing fly currently holds KRC Longest Flight Record 45 mm 31 sec can see Fig 5 charac teristically 10 16-mm plane suspect accumulate flights peak will reached flight profile will probably fall around 13 mm plane handles wind surprisingly well its light wing loading poly dihedral undercambered airfoil Lack ing steerable wheel plane doesnt much ground will take off unassisted time low grass some headwind ground roll ap proaches zero enough wind some tricky controlling plane will fly back wardswith no bad tendencies Like gliders would normally think putting variable-speed control OldTimer No doubt because Free Flight conditioning just get thing up high possible quickly possible However Im stuff anymore no fields now wish built proportional motor control Having vari able throttle adds new dimension already enjoyable airplane found out 1-3 first flown OFF-LO HI power control ways Playboy similar excellent candidate feature course youre Elec tric O-T competition just stay ON-OFF motor control As before vital statistics give some detail Again lightweight oper ative word cannot stress point too much have seen magnificentlyconstructed Electric Kadet equally supurb Flyline Megowcoupe truly fine craftsmanship same modeler fail fly solely because planes too heavy say least planes bit over-embellished extra struc ture lots heavy wood pieces various nif ty fittings Continued page 136 March 1984 133 ALL SHEET ONE PIECE AAA GRADE KILN DRIED SANDED TO CLOSE TOLERANCES PED 100% 17318x1112 261/2x2 30 37 rough landings aborted takeoffs hectic fun fly events hangar dings once spun down because ran radio battery down Its its third set wheels Ive used test purposes carry dead weights 8-oz I-lb iron blocks Other pilots have flown including young boy never held transmitter Obviously has taken much abuse Screwdriver Tool Set @ $700 Polks Model-Craft Hobbies Dept 2084 346 Bergen Ave Jersey City NJ 07304 tel 20 1/3328100 POWRZOOM winch serious flyer demands extraordinary launching power sailplane particularly F3Bscale cross-country Included antikiting/ antibacklash brake 2200 ft braided nylon 160 lb line manual tow drum foot brake new specially engineered motor much capable drum speeds 5000 rpm launching 3 meter sailplane ijchoose speed select pulleys j% launcha minute flights use companion RETRIEVER $250 Electrics/Kopski Continued page 133 Im convinced both planes good candidate designs Electric structures must beefed up lightness Personally felt terrible because somehow failed convey importance lightweight flying friendnot once twice Being determined stal wart modeler now off finishing two electric-powered Old-Timers Buzzard Bombshell Playboy Remember what said earlier series suggest thinking terms quarter ouncesfour make up ounce four make up quarter pounder Playboy Old-Timer Vital Statistics Wing styleElliptical tips Wingspan68 Wing chord constant9/2 Wing area planform576 sq DihedralPoly Wing frame weight4 Oz DAVE V SYSTEMS CORPOR ION ONE WOOD LANE MALVERNPA19355 215644-0692 Write call information Wing weight covered6 oz AirfoilUndercambered Tail assemblyBuilt-up Tail weight covered11/2 OZ Fuselage construction uilt-up stick Fuselage weight covered 31/3 OZ RadioThree channels used Controls .. RudElev ON/OFF Mot Radio battery250 mAh Radio weight6/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorLeisure LT-50 DriveLeisure 251 gear Prop10-6 11-6 Mot gear prop weight7/2 Oz Misc weightApprox1 2 oz Total plane weight41 oz Power system weight20 oz Wing loading1O/4oz/sq ft need new timers fly like plane second installment Planes Flying next month 11 look some ways build strong lightweight model structures Therell some rules thumb will help maximize Electric achievementand some thoughts what plane choose Meanwhile please direct comments questions SASE author Bob Kopski 25 West End Dr Lansdale PA 19446 RC Scale/Wischers Continued oaoe 47 made exclusively model cant used another plane Too much lost model isnt rebuilt large investment time money normal Scale modeling makes sense expend effort direction preservation No 1 admonition make certain good battery life before flying session since batteries common source problems lead air plane damage Cyclers have place arent really insurance against failure much inclined rely upon expanded-scale voltmeter resistance load quick battery check first time voltmeter needle drops sud denly doesnt come up proper level good Scale model will have saved possible destruction next flight Overworked receiver cells carrying load swarm servos subject vibration weak link RC sys tem Using larger-capacity cells isnt solu tion because dead cell drops voltage below requirements Larger cells per mit flights larger servos 18 Scale airplanes nine flown regu larly have same charging jack sake convenience Deans-type socket switch wiring harness Plug ging meter simple matter leaves no excuse omitting check same meter can used checking trans mitter batteries peace mind alone its worth $16 price Tower Hobbies Second importance models bal ance point Tail-heavy models can flown incidence angles wing stabilizer properly set up burden controlling such unstable beast too great experienced fliers nose-heavy model may WING SPAN4 WING AREA198 51 ENGINE15 WEIGHT34 IS Babe body loan wing sheeting die Cut formert rolled planS 2 nSf. 15 HIGHLY AEROBATIC DESIGNED Weller Nu Dentouk Jr PEPPERMINT PATTIE 15 STINGER II CMASTER KJT Div BAR/RICH SALES CO 2 FAIRWAY-HANNIBAL M0834G1314/221 8853 WING SPAN 30 WING AREABOA sqin ENGINE45 EIGHT5s balsa unstractiOn die Cut lornCrs ribs 2shts InlI Claw plans Good ground Seedling gaelIc lending good first bipe FU LLY AEROB ATIC NEW R/C BOOKLET Answers questions often asked want get started R/C flying PLUS troduces best airplane start GOLDEN FALCON receive Copy ____________ SEND $200 TO ST CROIX OF PARK FALLS LTD PO Box 279P Park Falls WI 54552 136 Model Aviation batter inc1d * plus shipping
Edition: Model Aviation - 1984/03
Page Numbers: 40, 41, 42, 43, 44, 132, 133, 136
II YOLfd never Know tnai mis picmur iuy e Trockels taken nervous day author Reason First IligIlts 01 flis i- LUD iii progress As turned out plane flew off board J-3 now has variable throttle controlbut didnt back 1979 firstflight day snapped gliding sweet three-point landing power off plane real crowd charmer Planes flying months topic author describes detail what works him examples what should work com plete charts record history own overall flying activity flight-time performances four basic model types electric motor power theme runs throughout successful models have strong lightweight structures Part 7 EBob Kopski IN THIS SECTION next Ill try bring together often promised past issues youve following series time finish next months segment should well-equipped way experiencing first-time continuing Electric successwith under standing Its what call Electric Elation Four electrifying profiles success Long ago Part I took strong issue some common misconceptions electricpowered flying too difficult too heavy fly well doesnt have enough power offers too short flight month Im going take allencompassing swipe false impres sions presenting array hard data four different Electric airplanes suc cess stories include powered glider aerobatics type Sport Scale OldTimer should cover majority reader interests relatively simple airplanesno complicated high-technology machines beyond reach average modeler data mentioned include information hundreds flights planes As read will see histograms flight time performance no wild claims particular vital statistics planes involved Later well look some rules-of-thumb apply easy guidelines can apply achieve same satisfying gratifying Elec tric success An electric year Before get de tails planes let describe kind Nostalgic Playboy Cabin recalls everything trom yesteryear except spark goo gas engine Its transparent yellow MonoKote cov ering glistens sun showing off interesting structure Side windows clear MonoKote Front windshield open cooling air 40 MnI Aviation flying relevant because Im author because basis performance information presented earlier section t mentioned Im basically sport flier Other some friendly club fun fly events no com petitive flying Also live fly south eastern Pennsylvania makes subject terms conditions four-season year Although club Keystone RC Club flies year round moderated proviso weather permitting fact great percentage aero exploits takes place about six seven months given year Obviously flying done summer least winter demonstrated Fig histogram flights month 1982 chose graph 1982 because last complete year have data 1983 still progress written Fig clearly shows Electric flights occur As general rule no reason cannot fly Electrics year round far equipment goes its matter climate personal desire de termination craziness Along line KRC holds its annual First Frosty Fingers Fun Fly January 1 no matter what weather evident data format plane performance generally bet ter respects cooler drier months thats peculiar Electrics Lets break flight-year' profile down little Being sport flier fly its enjoyable convenient Specifically find evenings weekend mornings gratifying relevant because best thermal conditions part activity part data have collected Thus can safely view happy Electric flyin facts herein being factual conservative well nothing contrived Good bad flights alike graphed can confidently read see yourself what Electric performance can like can compare experiences ones youve heard about comment about things may hear flight watch always seems either too short too long depending upon point being made way flight times shown clocked launch landing nearest second However purposes simplicity graphing times shown rounded larger fractions minute Profile 1 powered glider Ive frequently mentioned Spectra design first performance profile well look Spectra-Soar glider member Spectra family Recall Part aspect Spectra design versatility different electric power systems can have used model Remember view what follows example nothing magical about Spectra Most planes similar charac teristics should perform comparably first tangible lesson 'what flies way another involves virtually everything written far series Fig 2 composite histogram two Spectra-Soars Together 283 flights charted 1982 1983 date should perfectly clear design 12 13-mm airplane average no ther mals course some longer flights shown thermal-assisted fact some long off graphs scale Some flights short test hops quickies end day vast majority flights piled up middle chart ones count Theyre ones should able equal time No adver tising hype friends just facts Lets look some other things Fig 2 Spectra-Soar #1 #2 belongs friend Spectra #2 data included just prove can exhibit same nominal performance However since has accumulated data lets look closely Notice 1983 year-to-date data plotted directly top flight infor mation 1982 peak essentially same fashion 165 data points flights plotted 1982 83 flights 1983 no different character means after first group 165 battery performance remained exactly same next 83 flightson premise total flight time average gauge battery performance clearly supportive position Part 4 bat teries last hundreds flights given proper care Now big news data accumu lated Spectra #1 five different motor types using same battery six 12 Ah cells motors used equally same number flights basically no difference total average flight time among motors some motor/prop combinations burned power climbed ag gressively shorter time total flight times less same preceding paragraph heavy stuff friend may want read again effect saying no matter FArh IQSU Al Fig 2 shows cnaracterstics two Spectras authors identified No 1 text the right John Hickeys Spectra other V-tail Six varia tions used members KRC Model convenient size transporting inexpensive motor system provides plenty power Chart shows provides satisfying flights all-white clean-lined Persuader design convinces people Electric can Pattern aerobatics pretty well planes performance has never drawn criticism instead has re ceived plenty acknowledgements holds KRCs record rolls-per-minute FIGURE ONE 1982 ELECTRIC FLIGHT PROFILE FOR B KOPSKI 120 100 80 60 40 U CD Li Li 0 w -m z 20 0 u J F Spectra-Soar Powered Glider Vital Statistics Wing styleRectangular Wingspan67 Wing chord constant8 Wing area planform536 sq DihedralPoly Wing frame weight45 oz Wing weight covered6/3 OZ AirfoilFlat bot 12% turbulated Tail assemblySheet balsa Tail weight covered1 oz Fuselage construction sheet box Fuselage weight complete3 oz RadioThree channels used Controls Elev Rud Mot ON/OFF prop stop Radio battery250 mAh Radio weight7 oz Motor batterySix 1 2 Ah cells Motor controlMicroswitch Battery weight12 oz Motor Various Astro Leisure Mabuchi DriveDirect PropsVarious 6-4 8-6 Motor/prop weight6-7/2 OZ Misc weightApprox 2 oz Total plane weight3839/z oz Power system weightt920/2 oz Wing loadingl0--1O5 oz/sq ft what appropriate motor suitable prop use plane flies about same total time same battery charge Thats just true plane should hold true similar plane remember Part 4s discussion about batteries described ways charging including conservative charging technique method does fill battery maximum stops short about 20% average 25 flight data Fig 1 such charging other examples course longer flights would result used digi tal charging Ive said before dont care clear kind airplane charge fly will keep air almost continuously Oh such Electric Elation Now lets take detailed look Spectra-Soar Remember plane similar example should perform comparably FIGURE TWO SPECTRA SOAR FLIGHT TIME HISTOGRAM D 1982SPECTRA #1 1983 TO DAIJ E SPECTRA #2 TOTAL FLIGHTS 283 II III II I 8 9 10 II 12 13 MINUTES II I I I 4567 7 ~FLEJi 1111111 14 15 16 17 18 19 20 21 So much fine details Lets step back look bigger picture Par ticulars stand out tabulation clude fact power system about half total plane weight typical number Also battery about 30% total plane itself light also strong holds record consecutive loops KRCa real wing-tester wing loading typical electric-powered gliders Ive seen Actually wing loading easily improved wing area can increased far rapidly corresponding increase overall weight statistics key plane light need lightness license weakness plane must have strength right places overall dur ability survive year after year routine handling Later well see some ways help accomplish Now lets get back motors props motor/prop combinations used model include two Astro OSs pn 2107 now discontinued 7-6 8-4 Top Flight Nylon Astro 075 XL 7-4 7-6 8-4 Top Flight Nylon last two much too large Leisure LT-50 Pattern Wind 6-4 7-6 Top Flight Nylon 7-6 too large Cox Gray Mabuchi RS-5505-6530 Mabuchi 550S both using 7-6 8-4 props practical purposes total flight times combinations virtually same As additional point interest combinations Spectra friends Spectra #2 has flown original Astro 05 pn 2107 economy motor thats perfectly satisfactory application 2107 originally marketed eight-cell 55 Ah battery GRAPH REPRESENTS TOTAL OF 511 FLIGHTS OF 8 ELECTRICS VIMr A50ND MONTH U Iz CD - Li LJ -o w -m -z 20 IS 10 5 0 swinging 6-4 prop documented flight performance Spectra #2 six 12 Ah cells larger props As esti mate based other planes experience eight-cell 55 Ah pack would result Spectra-Soar flights about 6 7 mm Profile 2 aerobatic plane some reason measure Electrics model ers minds well poorly Pattern flying particularly curious because part people Ive seen Electrics arent aerobatics dont seem least bit concerned having fun blowing holes sky Nevertheless find phase flying liking well take closer look application First what Ive seen Elec tric no match conventional glowpowered Pattern planes least very long flights Thus youre thinking ing what big boys forget other hand relatively simple aero batics 5 mm liking read What relatively simple aerobatics Ill list what have either seen done myself inside outside loops aileron rolls sustained inverted flight spins knife edge Immelmanns hammerheads split-Ss long answer de picted Fig 3 Fig 3 histogram flight time number flights Persuader name has purpose plane convinces people Unlike glider flight time aerobatic plane much longer useful motor run time Such plane depends continuous power perform Also un like glider motor prop choices limited because efficient power deliv ery required desired flight charac teristics given power system aerobatic plane flight time determined large extent nature flight con stant maneuvering flight windy condi tions very hot humid air average power consumption relatively high contrasts power consumption flying done straightaway speed increases prop unloads cur rent drain reduced flights longer Putting another way longer flights will result simple up-and-down-the-field flight aerobatics listed previ ously mind lets examine Fig 3 Notice general lack peaking flatter broader shape histogram en velope like think plane 4 5-mm machine depending mood because influences fly course data conclusions assume equal charges flight data shown essentially flights resulting conservative charge limited number cases chose digital charge resulting flight about /2 mm longer apparent average 4 mm relatively 1983 DATE FIGURE THREE PERSUADER FLIGHT TIME HISTOGRAM 10 1982 I C -J LL 5 0 w zri 0Ii 1020304050II62b30405 345 MINUTES 25 20 U 15 CD U 0 U 10 z 5 10 20 30 40 50 6 FIGURE FOUR 1980 THRU 1983 TO DATE J-3 SPORT SCALE FLIGHT PROFILE II 3456 MINUTES few shorter flights graphed almost due either 'short charge' purposely-terminated flight Unlike Spectra Persuader has flown Cobalt 05 six-cell 12 Ah battery say workable power system Persuader derived Wasp published Jim Zarembski RCM have seen several Wasps KRC Electric Fly events powered both Astro Cobalt OSs Leisure LT-50s both impressive performance fact Jim lists several candi n II'I' 78910 date power systems Wasp plans Since Ive used combination above can report Incidentally Persuader will fly aerobatic maneuvers listed Since has no rudder control maneuvers requiring course out Since Ive now begun talk about makeup plane lets move Vital Statistics Persuader As case Spectra Persuader example Similar designs should perform comparably Continued page 44 nO4 AVI FIGURE FIVE PLAYBOY OLD-TIMER FLIGHT PROFILE 6NOTE NOT SHOWN ARE FLIGHTS 15OF 45 MIN 31 SEC AND CD37 MIN 39 SEC J4 CA LA3 0 U2 zII 0FJF1F1 0 10 02530 MINUTES FOUR CYCLE ENGINE MOUNTS High tensile aluminum alloy Precision machined polished Hardened socket cap screws included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENYA 601295 No 31995 ENYA 901295 No 31452 HP VT 21750 No 31644 HP VT 49895 No 31654 MAX FS 40895 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201995 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45895 No 32195 SAITO FA 1201995 AT MOST HOBBY SHOPS OR OROER DIRECT Send 100 tor 12 page Illustrated catalog Handy Tools Precision Sanding ALUMINUM EXTRUSION SANDING BLOCKADJUSTABLE TENSION use RUFF-STUFF82HAND BELT SANDER Self adhesive sandpaperFIRMLY HOLDS PAPER Makes Sanding InSmallFOR EASIER SANDING Areas Snap$220 Wont Wear Out~~A ed flats curves Handy Use Handy Hold 11 inch $235 Easy Use 22 Inch sasoextra strips $1 40 APPLIED DESIGN CORPAdd 20% torcatalog 738 PENN STREET EL SEGUNDO CA 90245 torPoatago Persuader Aerobatic Vital Statistics Wing styleRectangular Wingspan37 Wing chord constant8 Wing area planform296 sq DihedralNone Wing frame weight3 oz Wing weight covered4 oz Airfoil . NACA 2410 semi-sym 10% Tail assemblySheet balsa Tail weight coveredNo data Fuselage construction . sheet box Fuselage weightNo data RadioThree channels used ControlsEIev Ail Mot ON/OFF Radio battery70 mAh Radio weight5/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorAstro Cobalt 05 DriveDirect Prop7-6 Top Flight Nylon Motor/prop weight6 oz Misc weightApprox 2 oz Total plane weight33 oz Power system weight19 oz Wing loading16 oz/sq ft Again basic airplane very light about 85 oz structure theless strong durable must withstand aerobatics survive general flying landing handling Notice power system about 58% total weight plane itself less 26% Later will see quantitatively important weight really As special point interest notice mention 70 mAh radio battery con sists four cells removed General Electric 9V Ni-Cd consumer-grade battery provides enough power four flights stop four discharge re charge field As writing have 436 flights pack first used earlier aerobatic plane before finding home Persuader may very well have read about heard better performance described have Im sure exists other extreme Im sure have impression Electric gliders What presented pro file real workable electric-powered aerobatic plane Theres no magic involved anyone used flying prop will have learn fly wing Nevertheless should able match kind performance beat please let know remember Im easily impressed lot shouting hand-waving about great some flight seemed Theres too much sort prop wash already Instead come 1984 Electric Fly persuade Profile 3 Sport Scale perhaps ming Electric applications Continued page 132 AALAA-I- Electric flight challenge sport flier competitor alike Watts Up introduction should gratifying Happy landings Radio Technique/Myers Continued page 39 ing microscopic whiskers through sulating paper can blow out whis kers high-voltage charge really trust cells afterward dont So away workbench lot Chargemaster may prove fine tool Ace RC Inc Box 51 lE Higginsville MO 64037 George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 [ writing advertisers mention t read about ModI Aviation J-3 has proven over years real crowd pleaserprobably because its good old J-3 fact touches ob servers plane built winter 1978-79 first flown March 3 latter year didnt know till later Bob Boucher Astro Flight design ing Porterfield same time two planes very similar date J-3 has accumulated 334 flights drop oil has soaked 150 depicted Fig 4 Prior 1980 keeping record flight time date number flights thats reason about half plotted Fig 4 obvious five-mm airplane can see vital statistics what details Heres some information about plane J-3 scratch-built using Sig plans guideline Since electricpowered knew plane itself lightweight rugged kit version glow engine would set about redrawing plans choosing construc tion techniques wood sizes consistent application also changed air foil 12/2% flat-bottom section Dihedral added lieu ailerons Result real charmer Admittedly 1-3 fair-weather flier does handle wind well defi nitely fun fly calm air typical flight starts small amount ground handling followed taxi takeoff Fol lowing climb-out back off proportional throttle cruise around Flybys snapbeautiful experience plane pussycat handling several times Ive nearly hypnotized myself flying myself Usually Ill some touch-and-goes two inside loops playing throttle control needed plane glides nicely note some longer lift-assisted flight times Fig 4 generally keep power whole flight varying amount de sired effect About third time have enough power left after landing taxi back pit area Otherwise power out have bring back dead-stick 1-3 good example inadequate battery cooling Im fourth battery heat reason time design construction what looked like good installation cooling has proved adequate Whatever knowledge may have Electrics has come cheaply 15-size motor used plane new version plane new so-called black back 15 current model Astro 15 rather different motor Ferrite 15 uses 12 cells 12 Ah may install someday get longer flights overall weight will increase about 9 oz estimate flight time should increase about 8-9 mm Look over vitals get general idea candidate designs around would perform comparably would require some modeling effort make suitable electric power J-3 example Astro Porterfield 132 Model Aviation Watts Up/MarronElectrics/Kopski Continued page 130 Continued paqe 44 jSSOATES INCNEW MO 13 N IS Dont bee stung AIDS CLOUD WAYHAYWARD CA 945S OS4ONCsalaENYA GUARANTEED CY NO 5310 Os l2O4cy NO 5317 HOT SHOT Hor~US PAT 4405890 Hand held rechargeable glow plug energizer size engine uses gtow plug Small enough carry yoijr shirt pocket Makes dry cell batteries power losing wires thing ot past Easy attachment cowd engines Reinforced extra hard use Can charged upto 1000 times Uses HEAD LOCK glow plug connector MODEL PRODUCTS CORP positive corinec tion tothe glow plug 90 day unconditional guarantee plus limited warranty up year Complete instructions charger Available dealer order direct Visa Mastercard accepted Add Si 50 postage power convenience $1995 Without charger $1595 b & r Hobbies PO Box 192 Oscoda MI 48750 [517] 7393549 Making Leisure Time Enjoyable excellent kit example way opinion roughly size plane power system about minimum neces sary reliable ground handling takeoff grassy fields under varying weather con ditions Except some occasional tail dragger-itis plane always gets off J-3 Sport Scale Vital Statistics Wing styleScale Wingspan70/2 Wing chord constant10 Wing area planform sq Dihedral5 deg/panel Wing frame weight6/4 oz Wing weight covered10% oz Airfoil12% flat bottom Tail assemblyBuilt-up Tail weight covered2 oz Fuselage construction tick built-up Fuselage weight No data Radio Three channels used Controls Rud Elev Mot Radio battery 250 mAb Radio weight 8 oz Motor battery 16 cells 55 Ah Motor control Variable speed Battery weight 16 oz Motor Astro 15 reducer Drive Belt Prop Top Flight 12-8 wood Mot Red prop weight 13 oz Misc weightApprox 1 2 oz Total plane weight68 oz Power system weight .. 30 oz approx Wing loading14 ozIsq ft Otherincluded above Wing struts Hdwr1 oz Wheels Trexler lOG2 oz Comp LG Assy4 oz Again same message plane must lightweight Please dont confuse being weak fragile such need notbe case particular model has over 300 flights approaching its fifth birthday 1-3 has its share Profile 4 Old-Timer recent plane Playboy Cabin Old-Timer built Leisure kit am ordinarily kit builder wanted new plane hurry Ive wanting Old-Timer years natural As writing plane about two months old dont have nearly much accumulated flight data other examples plane perfectly delightful fly product review product review product review modeler likes complete sets tools very good value selec tion six screwdriver sizes included set hex-nut drivers precision wrench es hex-nut key drivers assorted Phillipshead screwdrivers sizes convenient modeling purposes Altogether get 21 pieces plus handy tray $700 product review product review product review Old-Timers everyones preference everyone seems enjoy watch ing fly currently holds KRC Longest Flight Record 45 mm 31 sec can see Fig 5 charac teristically 10 16-mm plane suspect accumulate flights peak will reached flight profile will probably fall around 13 mm plane handles wind surprisingly well its light wing loading poly dihedral undercambered airfoil Lack ing steerable wheel plane doesnt much ground will take off unassisted time low grass some headwind ground roll ap proaches zero enough wind some tricky controlling plane will fly back wardswith no bad tendencies Like gliders would normally think putting variable-speed control OldTimer No doubt because Free Flight conditioning just get thing up high possible quickly possible However Im stuff anymore no fields now wish built proportional motor control Having vari able throttle adds new dimension already enjoyable airplane found out 1-3 first flown OFF-LO HI power control ways Playboy similar excellent candidate feature course youre Elec tric O-T competition just stay ON-OFF motor control As before vital statistics give some detail Again lightweight oper ative word cannot stress point too much have seen magnificentlyconstructed Electric Kadet equally supurb Flyline Megowcoupe truly fine craftsmanship same modeler fail fly solely because planes too heavy say least planes bit over-embellished extra struc ture lots heavy wood pieces various nif ty fittings Continued page 136 March 1984 133 ALL SHEET ONE PIECE AAA GRADE KILN DRIED SANDED TO CLOSE TOLERANCES PED 100% 17318x1112 261/2x2 30 37 rough landings aborted takeoffs hectic fun fly events hangar dings once spun down because ran radio battery down Its its third set wheels Ive used test purposes carry dead weights 8-oz I-lb iron blocks Other pilots have flown including young boy never held transmitter Obviously has taken much abuse Screwdriver Tool Set @ $700 Polks Model-Craft Hobbies Dept 2084 346 Bergen Ave Jersey City NJ 07304 tel 20 1/3328100 POWRZOOM winch serious flyer demands extraordinary launching power sailplane particularly F3Bscale cross-country Included antikiting/ antibacklash brake 2200 ft braided nylon 160 lb line manual tow drum foot brake new specially engineered motor much capable drum speeds 5000 rpm launching 3 meter sailplane ijchoose speed select pulleys j% launcha minute flights use companion RETRIEVER $250 Electrics/Kopski Continued page 133 Im convinced both planes good candidate designs Electric structures must beefed up lightness Personally felt terrible because somehow failed convey importance lightweight flying friendnot once twice Being determined stal wart modeler now off finishing two electric-powered Old-Timers Buzzard Bombshell Playboy Remember what said earlier series suggest thinking terms quarter ouncesfour make up ounce four make up quarter pounder Playboy Old-Timer Vital Statistics Wing styleElliptical tips Wingspan68 Wing chord constant9/2 Wing area planform576 sq DihedralPoly Wing frame weight4 Oz DAVE V SYSTEMS CORPOR ION ONE WOOD LANE MALVERNPA19355 215644-0692 Write call information Wing weight covered6 oz AirfoilUndercambered Tail assemblyBuilt-up Tail weight covered11/2 OZ Fuselage construction uilt-up stick Fuselage weight covered 31/3 OZ RadioThree channels used Controls .. RudElev ON/OFF Mot Radio battery250 mAh Radio weight6/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorLeisure LT-50 DriveLeisure 251 gear Prop10-6 11-6 Mot gear prop weight7/2 Oz Misc weightApprox1 2 oz Total plane weight41 oz Power system weight20 oz Wing loading1O/4oz/sq ft need new timers fly like plane second installment Planes Flying next month 11 look some ways build strong lightweight model structures Therell some rules thumb will help maximize Electric achievementand some thoughts what plane choose Meanwhile please direct comments questions SASE author Bob Kopski 25 West End Dr Lansdale PA 19446 RC Scale/Wischers Continued oaoe 47 made exclusively model cant used another plane Too much lost model isnt rebuilt large investment time money normal Scale modeling makes sense expend effort direction preservation No 1 admonition make certain good battery life before flying session since batteries common source problems lead air plane damage Cyclers have place arent really insurance against failure much inclined rely upon expanded-scale voltmeter resistance load quick battery check first time voltmeter needle drops sud denly doesnt come up proper level good Scale model will have saved possible destruction next flight Overworked receiver cells carrying load swarm servos subject vibration weak link RC sys tem Using larger-capacity cells isnt solu tion because dead cell drops voltage below requirements Larger cells per mit flights larger servos 18 Scale airplanes nine flown regu larly have same charging jack sake convenience Deans-type socket switch wiring harness Plug ging meter simple matter leaves no excuse omitting check same meter can used checking trans mitter batteries peace mind alone its worth $16 price Tower Hobbies Second importance models bal ance point Tail-heavy models can flown incidence angles wing stabilizer properly set up burden controlling such unstable beast too great experienced fliers nose-heavy model may WING SPAN4 WING AREA198 51 ENGINE15 WEIGHT34 IS Babe body loan wing sheeting die Cut formert rolled planS 2 nSf. 15 HIGHLY AEROBATIC DESIGNED Weller Nu Dentouk Jr PEPPERMINT PATTIE 15 STINGER II CMASTER KJT Div BAR/RICH SALES CO 2 FAIRWAY-HANNIBAL M0834G1314/221 8853 WING SPAN 30 WING AREABOA sqin ENGINE45 EIGHT5s balsa unstractiOn die Cut lornCrs ribs 2shts InlI Claw plans Good ground Seedling gaelIc lending good first bipe FU LLY AEROB ATIC NEW R/C BOOKLET Answers questions often asked want get started R/C flying PLUS troduces best airplane start GOLDEN FALCON receive Copy ____________ SEND $200 TO ST CROIX OF PARK FALLS LTD PO Box 279P Park Falls WI 54552 136 Model Aviation batter inc1d * plus shipping
Edition: Model Aviation - 1984/03
Page Numbers: 40, 41, 42, 43, 44, 132, 133, 136
II YOLfd never Know tnai mis picmur iuy e Trockels taken nervous day author Reason First IligIlts 01 flis i- LUD iii progress As turned out plane flew off board J-3 now has variable throttle controlbut didnt back 1979 firstflight day snapped gliding sweet three-point landing power off plane real crowd charmer Planes flying months topic author describes detail what works him examples what should work com plete charts record history own overall flying activity flight-time performances four basic model types electric motor power theme runs throughout successful models have strong lightweight structures Part 7 EBob Kopski IN THIS SECTION next Ill try bring together often promised past issues youve following series time finish next months segment should well-equipped way experiencing first-time continuing Electric successwith under standing Its what call Electric Elation Four electrifying profiles success Long ago Part I took strong issue some common misconceptions electricpowered flying too difficult too heavy fly well doesnt have enough power offers too short flight month Im going take allencompassing swipe false impres sions presenting array hard data four different Electric airplanes suc cess stories include powered glider aerobatics type Sport Scale OldTimer should cover majority reader interests relatively simple airplanesno complicated high-technology machines beyond reach average modeler data mentioned include information hundreds flights planes As read will see histograms flight time performance no wild claims particular vital statistics planes involved Later well look some rules-of-thumb apply easy guidelines can apply achieve same satisfying gratifying Elec tric success An electric year Before get de tails planes let describe kind Nostalgic Playboy Cabin recalls everything trom yesteryear except spark goo gas engine Its transparent yellow MonoKote cov ering glistens sun showing off interesting structure Side windows clear MonoKote Front windshield open cooling air 40 MnI Aviation flying relevant because Im author because basis performance information presented earlier section t mentioned Im basically sport flier Other some friendly club fun fly events no com petitive flying Also live fly south eastern Pennsylvania makes subject terms conditions four-season year Although club Keystone RC Club flies year round moderated proviso weather permitting fact great percentage aero exploits takes place about six seven months given year Obviously flying done summer least winter demonstrated Fig histogram flights month 1982 chose graph 1982 because last complete year have data 1983 still progress written Fig clearly shows Electric flights occur As general rule no reason cannot fly Electrics year round far equipment goes its matter climate personal desire de termination craziness Along line KRC holds its annual First Frosty Fingers Fun Fly January 1 no matter what weather evident data format plane performance generally bet ter respects cooler drier months thats peculiar Electrics Lets break flight-year' profile down little Being sport flier fly its enjoyable convenient Specifically find evenings weekend mornings gratifying relevant because best thermal conditions part activity part data have collected Thus can safely view happy Electric flyin facts herein being factual conservative well nothing contrived Good bad flights alike graphed can confidently read see yourself what Electric performance can like can compare experiences ones youve heard about comment about things may hear flight watch always seems either too short too long depending upon point being made way flight times shown clocked launch landing nearest second However purposes simplicity graphing times shown rounded larger fractions minute Profile 1 powered glider Ive frequently mentioned Spectra design first performance profile well look Spectra-Soar glider member Spectra family Recall Part aspect Spectra design versatility different electric power systems can have used model Remember view what follows example nothing magical about Spectra Most planes similar charac teristics should perform comparably first tangible lesson 'what flies way another involves virtually everything written far series Fig 2 composite histogram two Spectra-Soars Together 283 flights charted 1982 1983 date should perfectly clear design 12 13-mm airplane average no ther mals course some longer flights shown thermal-assisted fact some long off graphs scale Some flights short test hops quickies end day vast majority flights piled up middle chart ones count Theyre ones should able equal time No adver tising hype friends just facts Lets look some other things Fig 2 Spectra-Soar #1 #2 belongs friend Spectra #2 data included just prove can exhibit same nominal performance However since has accumulated data lets look closely Notice 1983 year-to-date data plotted directly top flight infor mation 1982 peak essentially same fashion 165 data points flights plotted 1982 83 flights 1983 no different character means after first group 165 battery performance remained exactly same next 83 flightson premise total flight time average gauge battery performance clearly supportive position Part 4 bat teries last hundreds flights given proper care Now big news data accumu lated Spectra #1 five different motor types using same battery six 12 Ah cells motors used equally same number flights basically no difference total average flight time among motors some motor/prop combinations burned power climbed ag gressively shorter time total flight times less same preceding paragraph heavy stuff friend may want read again effect saying no matter FArh IQSU Al Fig 2 shows cnaracterstics two Spectras authors identified No 1 text the right John Hickeys Spectra other V-tail Six varia tions used members KRC Model convenient size transporting inexpensive motor system provides plenty power Chart shows provides satisfying flights all-white clean-lined Persuader design convinces people Electric can Pattern aerobatics pretty well planes performance has never drawn criticism instead has re ceived plenty acknowledgements holds KRCs record rolls-per-minute FIGURE ONE 1982 ELECTRIC FLIGHT PROFILE FOR B KOPSKI 120 100 80 60 40 U CD Li Li 0 w -m z 20 0 u J F Spectra-Soar Powered Glider Vital Statistics Wing styleRectangular Wingspan67 Wing chord constant8 Wing area planform536 sq DihedralPoly Wing frame weight45 oz Wing weight covered6/3 OZ AirfoilFlat bot 12% turbulated Tail assemblySheet balsa Tail weight covered1 oz Fuselage construction sheet box Fuselage weight complete3 oz RadioThree channels used Controls Elev Rud Mot ON/OFF prop stop Radio battery250 mAh Radio weight7 oz Motor batterySix 1 2 Ah cells Motor controlMicroswitch Battery weight12 oz Motor Various Astro Leisure Mabuchi DriveDirect PropsVarious 6-4 8-6 Motor/prop weight6-7/2 OZ Misc weightApprox 2 oz Total plane weight3839/z oz Power system weightt920/2 oz Wing loadingl0--1O5 oz/sq ft what appropriate motor suitable prop use plane flies about same total time same battery charge Thats just true plane should hold true similar plane remember Part 4s discussion about batteries described ways charging including conservative charging technique method does fill battery maximum stops short about 20% average 25 flight data Fig 1 such charging other examples course longer flights would result used digi tal charging Ive said before dont care clear kind airplane charge fly will keep air almost continuously Oh such Electric Elation Now lets take detailed look Spectra-Soar Remember plane similar example should perform comparably FIGURE TWO SPECTRA SOAR FLIGHT TIME HISTOGRAM D 1982SPECTRA #1 1983 TO DAIJ E SPECTRA #2 TOTAL FLIGHTS 283 II III II I 8 9 10 II 12 13 MINUTES II I I I 4567 7 ~FLEJi 1111111 14 15 16 17 18 19 20 21 So much fine details Lets step back look bigger picture Par ticulars stand out tabulation clude fact power system about half total plane weight typical number Also battery about 30% total plane itself light also strong holds record consecutive loops KRCa real wing-tester wing loading typical electric-powered gliders Ive seen Actually wing loading easily improved wing area can increased far rapidly corresponding increase overall weight statistics key plane light need lightness license weakness plane must have strength right places overall dur ability survive year after year routine handling Later well see some ways help accomplish Now lets get back motors props motor/prop combinations used model include two Astro OSs pn 2107 now discontinued 7-6 8-4 Top Flight Nylon Astro 075 XL 7-4 7-6 8-4 Top Flight Nylon last two much too large Leisure LT-50 Pattern Wind 6-4 7-6 Top Flight Nylon 7-6 too large Cox Gray Mabuchi RS-5505-6530 Mabuchi 550S both using 7-6 8-4 props practical purposes total flight times combinations virtually same As additional point interest combinations Spectra friends Spectra #2 has flown original Astro 05 pn 2107 economy motor thats perfectly satisfactory application 2107 originally marketed eight-cell 55 Ah battery GRAPH REPRESENTS TOTAL OF 511 FLIGHTS OF 8 ELECTRICS VIMr A50ND MONTH U Iz CD - Li LJ -o w -m -z 20 IS 10 5 0 swinging 6-4 prop documented flight performance Spectra #2 six 12 Ah cells larger props As esti mate based other planes experience eight-cell 55 Ah pack would result Spectra-Soar flights about 6 7 mm Profile 2 aerobatic plane some reason measure Electrics model ers minds well poorly Pattern flying particularly curious because part people Ive seen Electrics arent aerobatics dont seem least bit concerned having fun blowing holes sky Nevertheless find phase flying liking well take closer look application First what Ive seen Elec tric no match conventional glowpowered Pattern planes least very long flights Thus youre thinking ing what big boys forget other hand relatively simple aero batics 5 mm liking read What relatively simple aerobatics Ill list what have either seen done myself inside outside loops aileron rolls sustained inverted flight spins knife edge Immelmanns hammerheads split-Ss long answer de picted Fig 3 Fig 3 histogram flight time number flights Persuader name has purpose plane convinces people Unlike glider flight time aerobatic plane much longer useful motor run time Such plane depends continuous power perform Also un like glider motor prop choices limited because efficient power deliv ery required desired flight charac teristics given power system aerobatic plane flight time determined large extent nature flight con stant maneuvering flight windy condi tions very hot humid air average power consumption relatively high contrasts power consumption flying done straightaway speed increases prop unloads cur rent drain reduced flights longer Putting another way longer flights will result simple up-and-down-the-field flight aerobatics listed previ ously mind lets examine Fig 3 Notice general lack peaking flatter broader shape histogram en velope like think plane 4 5-mm machine depending mood because influences fly course data conclusions assume equal charges flight data shown essentially flights resulting conservative charge limited number cases chose digital charge resulting flight about /2 mm longer apparent average 4 mm relatively 1983 DATE FIGURE THREE PERSUADER FLIGHT TIME HISTOGRAM 10 1982 I C -J LL 5 0 w zri 0Ii 1020304050II62b30405 345 MINUTES 25 20 U 15 CD U 0 U 10 z 5 10 20 30 40 50 6 FIGURE FOUR 1980 THRU 1983 TO DATE J-3 SPORT SCALE FLIGHT PROFILE II 3456 MINUTES few shorter flights graphed almost due either 'short charge' purposely-terminated flight Unlike Spectra Persuader has flown Cobalt 05 six-cell 12 Ah battery say workable power system Persuader derived Wasp published Jim Zarembski RCM have seen several Wasps KRC Electric Fly events powered both Astro Cobalt OSs Leisure LT-50s both impressive performance fact Jim lists several candi n II'I' 78910 date power systems Wasp plans Since Ive used combination above can report Incidentally Persuader will fly aerobatic maneuvers listed Since has no rudder control maneuvers requiring course out Since Ive now begun talk about makeup plane lets move Vital Statistics Persuader As case Spectra Persuader example Similar designs should perform comparably Continued page 44 nO4 AVI FIGURE FIVE PLAYBOY OLD-TIMER FLIGHT PROFILE 6NOTE NOT SHOWN ARE FLIGHTS 15OF 45 MIN 31 SEC AND CD37 MIN 39 SEC J4 CA LA3 0 U2 zII 0FJF1F1 0 10 02530 MINUTES FOUR CYCLE ENGINE MOUNTS High tensile aluminum alloy Precision machined polished Hardened socket cap screws included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENYA 601295 No 31995 ENYA 901295 No 31452 HP VT 21750 No 31644 HP VT 49895 No 31654 MAX FS 40895 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201995 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45895 No 32195 SAITO FA 1201995 AT MOST HOBBY SHOPS OR OROER DIRECT Send 100 tor 12 page Illustrated catalog Handy Tools Precision Sanding ALUMINUM EXTRUSION SANDING BLOCKADJUSTABLE TENSION use RUFF-STUFF82HAND BELT SANDER Self adhesive sandpaperFIRMLY HOLDS PAPER Makes Sanding InSmallFOR EASIER SANDING Areas Snap$220 Wont Wear Out~~A ed flats curves Handy Use Handy Hold 11 inch $235 Easy Use 22 Inch sasoextra strips $1 40 APPLIED DESIGN CORPAdd 20% torcatalog 738 PENN STREET EL SEGUNDO CA 90245 torPoatago Persuader Aerobatic Vital Statistics Wing styleRectangular Wingspan37 Wing chord constant8 Wing area planform296 sq DihedralNone Wing frame weight3 oz Wing weight covered4 oz Airfoil . NACA 2410 semi-sym 10% Tail assemblySheet balsa Tail weight coveredNo data Fuselage construction . sheet box Fuselage weightNo data RadioThree channels used ControlsEIev Ail Mot ON/OFF Radio battery70 mAh Radio weight5/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorAstro Cobalt 05 DriveDirect Prop7-6 Top Flight Nylon Motor/prop weight6 oz Misc weightApprox 2 oz Total plane weight33 oz Power system weight19 oz Wing loading16 oz/sq ft Again basic airplane very light about 85 oz structure theless strong durable must withstand aerobatics survive general flying landing handling Notice power system about 58% total weight plane itself less 26% Later will see quantitatively important weight really As special point interest notice mention 70 mAh radio battery con sists four cells removed General Electric 9V Ni-Cd consumer-grade battery provides enough power four flights stop four discharge re charge field As writing have 436 flights pack first used earlier aerobatic plane before finding home Persuader may very well have read about heard better performance described have Im sure exists other extreme Im sure have impression Electric gliders What presented pro file real workable electric-powered aerobatic plane Theres no magic involved anyone used flying prop will have learn fly wing Nevertheless should able match kind performance beat please let know remember Im easily impressed lot shouting hand-waving about great some flight seemed Theres too much sort prop wash already Instead come 1984 Electric Fly persuade Profile 3 Sport Scale perhaps ming Electric applications Continued page 132 AALAA-I- Electric flight challenge sport flier competitor alike Watts Up introduction should gratifying Happy landings Radio Technique/Myers Continued page 39 ing microscopic whiskers through sulating paper can blow out whis kers high-voltage charge really trust cells afterward dont So away workbench lot Chargemaster may prove fine tool Ace RC Inc Box 51 lE Higginsville MO 64037 George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 [ writing advertisers mention t read about ModI Aviation J-3 has proven over years real crowd pleaserprobably because its good old J-3 fact touches ob servers plane built winter 1978-79 first flown March 3 latter year didnt know till later Bob Boucher Astro Flight design ing Porterfield same time two planes very similar date J-3 has accumulated 334 flights drop oil has soaked 150 depicted Fig 4 Prior 1980 keeping record flight time date number flights thats reason about half plotted Fig 4 obvious five-mm airplane can see vital statistics what details Heres some information about plane J-3 scratch-built using Sig plans guideline Since electricpowered knew plane itself lightweight rugged kit version glow engine would set about redrawing plans choosing construc tion techniques wood sizes consistent application also changed air foil 12/2% flat-bottom section Dihedral added lieu ailerons Result real charmer Admittedly 1-3 fair-weather flier does handle wind well defi nitely fun fly calm air typical flight starts small amount ground handling followed taxi takeoff Fol lowing climb-out back off proportional throttle cruise around Flybys snapbeautiful experience plane pussycat handling several times Ive nearly hypnotized myself flying myself Usually Ill some touch-and-goes two inside loops playing throttle control needed plane glides nicely note some longer lift-assisted flight times Fig 4 generally keep power whole flight varying amount de sired effect About third time have enough power left after landing taxi back pit area Otherwise power out have bring back dead-stick 1-3 good example inadequate battery cooling Im fourth battery heat reason time design construction what looked like good installation cooling has proved adequate Whatever knowledge may have Electrics has come cheaply 15-size motor used plane new version plane new so-called black back 15 current model Astro 15 rather different motor Ferrite 15 uses 12 cells 12 Ah may install someday get longer flights overall weight will increase about 9 oz estimate flight time should increase about 8-9 mm Look over vitals get general idea candidate designs around would perform comparably would require some modeling effort make suitable electric power J-3 example Astro Porterfield 132 Model Aviation Watts Up/MarronElectrics/Kopski Continued page 130 Continued paqe 44 jSSOATES INCNEW MO 13 N IS Dont bee stung AIDS CLOUD WAYHAYWARD CA 945S OS4ONCsalaENYA GUARANTEED CY NO 5310 Os l2O4cy NO 5317 HOT SHOT Hor~US PAT 4405890 Hand held rechargeable glow plug energizer size engine uses gtow plug Small enough carry yoijr shirt pocket Makes dry cell batteries power losing wires thing ot past Easy attachment cowd engines Reinforced extra hard use Can charged upto 1000 times Uses HEAD LOCK glow plug connector MODEL PRODUCTS CORP positive corinec tion tothe glow plug 90 day unconditional guarantee plus limited warranty up year Complete instructions charger Available dealer order direct Visa Mastercard accepted Add Si 50 postage power convenience $1995 Without charger $1595 b & r Hobbies PO Box 192 Oscoda MI 48750 [517] 7393549 Making Leisure Time Enjoyable excellent kit example way opinion roughly size plane power system about minimum neces sary reliable ground handling takeoff grassy fields under varying weather con ditions Except some occasional tail dragger-itis plane always gets off J-3 Sport Scale Vital Statistics Wing styleScale Wingspan70/2 Wing chord constant10 Wing area planform sq Dihedral5 deg/panel Wing frame weight6/4 oz Wing weight covered10% oz Airfoil12% flat bottom Tail assemblyBuilt-up Tail weight covered2 oz Fuselage construction tick built-up Fuselage weight No data Radio Three channels used Controls Rud Elev Mot Radio battery 250 mAb Radio weight 8 oz Motor battery 16 cells 55 Ah Motor control Variable speed Battery weight 16 oz Motor Astro 15 reducer Drive Belt Prop Top Flight 12-8 wood Mot Red prop weight 13 oz Misc weightApprox 1 2 oz Total plane weight68 oz Power system weight .. 30 oz approx Wing loading14 ozIsq ft Otherincluded above Wing struts Hdwr1 oz Wheels Trexler lOG2 oz Comp LG Assy4 oz Again same message plane must lightweight Please dont confuse being weak fragile such need notbe case particular model has over 300 flights approaching its fifth birthday 1-3 has its share Profile 4 Old-Timer recent plane Playboy Cabin Old-Timer built Leisure kit am ordinarily kit builder wanted new plane hurry Ive wanting Old-Timer years natural As writing plane about two months old dont have nearly much accumulated flight data other examples plane perfectly delightful fly product review product review product review modeler likes complete sets tools very good value selec tion six screwdriver sizes included set hex-nut drivers precision wrench es hex-nut key drivers assorted Phillipshead screwdrivers sizes convenient modeling purposes Altogether get 21 pieces plus handy tray $700 product review product review product review Old-Timers everyones preference everyone seems enjoy watch ing fly currently holds KRC Longest Flight Record 45 mm 31 sec can see Fig 5 charac teristically 10 16-mm plane suspect accumulate flights peak will reached flight profile will probably fall around 13 mm plane handles wind surprisingly well its light wing loading poly dihedral undercambered airfoil Lack ing steerable wheel plane doesnt much ground will take off unassisted time low grass some headwind ground roll ap proaches zero enough wind some tricky controlling plane will fly back wardswith no bad tendencies Like gliders would normally think putting variable-speed control OldTimer No doubt because Free Flight conditioning just get thing up high possible quickly possible However Im stuff anymore no fields now wish built proportional motor control Having vari able throttle adds new dimension already enjoyable airplane found out 1-3 first flown OFF-LO HI power control ways Playboy similar excellent candidate feature course youre Elec tric O-T competition just stay ON-OFF motor control As before vital statistics give some detail Again lightweight oper ative word cannot stress point too much have seen magnificentlyconstructed Electric Kadet equally supurb Flyline Megowcoupe truly fine craftsmanship same modeler fail fly solely because planes too heavy say least planes bit over-embellished extra struc ture lots heavy wood pieces various nif ty fittings Continued page 136 March 1984 133 ALL SHEET ONE PIECE AAA GRADE KILN DRIED SANDED TO CLOSE TOLERANCES PED 100% 17318x1112 261/2x2 30 37 rough landings aborted takeoffs hectic fun fly events hangar dings once spun down because ran radio battery down Its its third set wheels Ive used test purposes carry dead weights 8-oz I-lb iron blocks Other pilots have flown including young boy never held transmitter Obviously has taken much abuse Screwdriver Tool Set @ $700 Polks Model-Craft Hobbies Dept 2084 346 Bergen Ave Jersey City NJ 07304 tel 20 1/3328100 POWRZOOM winch serious flyer demands extraordinary launching power sailplane particularly F3Bscale cross-country Included antikiting/ antibacklash brake 2200 ft braided nylon 160 lb line manual tow drum foot brake new specially engineered motor much capable drum speeds 5000 rpm launching 3 meter sailplane ijchoose speed select pulleys j% launcha minute flights use companion RETRIEVER $250 Electrics/Kopski Continued page 133 Im convinced both planes good candidate designs Electric structures must beefed up lightness Personally felt terrible because somehow failed convey importance lightweight flying friendnot once twice Being determined stal wart modeler now off finishing two electric-powered Old-Timers Buzzard Bombshell Playboy Remember what said earlier series suggest thinking terms quarter ouncesfour make up ounce four make up quarter pounder Playboy Old-Timer Vital Statistics Wing styleElliptical tips Wingspan68 Wing chord constant9/2 Wing area planform576 sq DihedralPoly Wing frame weight4 Oz DAVE V SYSTEMS CORPOR ION ONE WOOD LANE MALVERNPA19355 215644-0692 Write call information Wing weight covered6 oz AirfoilUndercambered Tail assemblyBuilt-up Tail weight covered11/2 OZ Fuselage construction uilt-up stick Fuselage weight covered 31/3 OZ RadioThree channels used Controls .. RudElev ON/OFF Mot Radio battery250 mAh Radio weight6/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorLeisure LT-50 DriveLeisure 251 gear Prop10-6 11-6 Mot gear prop weight7/2 Oz Misc weightApprox1 2 oz Total plane weight41 oz Power system weight20 oz Wing loading1O/4oz/sq ft need new timers fly like plane second installment Planes Flying next month 11 look some ways build strong lightweight model structures Therell some rules thumb will help maximize Electric achievementand some thoughts what plane choose Meanwhile please direct comments questions SASE author Bob Kopski 25 West End Dr Lansdale PA 19446 RC Scale/Wischers Continued oaoe 47 made exclusively model cant used another plane Too much lost model isnt rebuilt large investment time money normal Scale modeling makes sense expend effort direction preservation No 1 admonition make certain good battery life before flying session since batteries common source problems lead air plane damage Cyclers have place arent really insurance against failure much inclined rely upon expanded-scale voltmeter resistance load quick battery check first time voltmeter needle drops sud denly doesnt come up proper level good Scale model will have saved possible destruction next flight Overworked receiver cells carrying load swarm servos subject vibration weak link RC sys tem Using larger-capacity cells isnt solu tion because dead cell drops voltage below requirements Larger cells per mit flights larger servos 18 Scale airplanes nine flown regu larly have same charging jack sake convenience Deans-type socket switch wiring harness Plug ging meter simple matter leaves no excuse omitting check same meter can used checking trans mitter batteries peace mind alone its worth $16 price Tower Hobbies Second importance models bal ance point Tail-heavy models can flown incidence angles wing stabilizer properly set up burden controlling such unstable beast too great experienced fliers nose-heavy model may WING SPAN4 WING AREA198 51 ENGINE15 WEIGHT34 IS Babe body loan wing sheeting die Cut formert rolled planS 2 nSf. 15 HIGHLY AEROBATIC DESIGNED Weller Nu Dentouk Jr PEPPERMINT PATTIE 15 STINGER II CMASTER KJT Div BAR/RICH SALES CO 2 FAIRWAY-HANNIBAL M0834G1314/221 8853 WING SPAN 30 WING AREABOA sqin ENGINE45 EIGHT5s balsa unstractiOn die Cut lornCrs ribs 2shts InlI Claw plans Good ground Seedling gaelIc lending good first bipe FU LLY AEROB ATIC NEW R/C BOOKLET Answers questions often asked want get started R/C flying PLUS troduces best airplane start GOLDEN FALCON receive Copy ____________ SEND $200 TO ST CROIX OF PARK FALLS LTD PO Box 279P Park Falls WI 54552 136 Model Aviation batter inc1d * plus shipping
Edition: Model Aviation - 1984/03
Page Numbers: 40, 41, 42, 43, 44, 132, 133, 136
II YOLfd never Know tnai mis picmur iuy e Trockels taken nervous day author Reason First IligIlts 01 flis i- LUD iii progress As turned out plane flew off board J-3 now has variable throttle controlbut didnt back 1979 firstflight day snapped gliding sweet three-point landing power off plane real crowd charmer Planes flying months topic author describes detail what works him examples what should work com plete charts record history own overall flying activity flight-time performances four basic model types electric motor power theme runs throughout successful models have strong lightweight structures Part 7 EBob Kopski IN THIS SECTION next Ill try bring together often promised past issues youve following series time finish next months segment should well-equipped way experiencing first-time continuing Electric successwith under standing Its what call Electric Elation Four electrifying profiles success Long ago Part I took strong issue some common misconceptions electricpowered flying too difficult too heavy fly well doesnt have enough power offers too short flight month Im going take allencompassing swipe false impres sions presenting array hard data four different Electric airplanes suc cess stories include powered glider aerobatics type Sport Scale OldTimer should cover majority reader interests relatively simple airplanesno complicated high-technology machines beyond reach average modeler data mentioned include information hundreds flights planes As read will see histograms flight time performance no wild claims particular vital statistics planes involved Later well look some rules-of-thumb apply easy guidelines can apply achieve same satisfying gratifying Elec tric success An electric year Before get de tails planes let describe kind Nostalgic Playboy Cabin recalls everything trom yesteryear except spark goo gas engine Its transparent yellow MonoKote cov ering glistens sun showing off interesting structure Side windows clear MonoKote Front windshield open cooling air 40 MnI Aviation flying relevant because Im author because basis performance information presented earlier section t mentioned Im basically sport flier Other some friendly club fun fly events no com petitive flying Also live fly south eastern Pennsylvania makes subject terms conditions four-season year Although club Keystone RC Club flies year round moderated proviso weather permitting fact great percentage aero exploits takes place about six seven months given year Obviously flying done summer least winter demonstrated Fig histogram flights month 1982 chose graph 1982 because last complete year have data 1983 still progress written Fig clearly shows Electric flights occur As general rule no reason cannot fly Electrics year round far equipment goes its matter climate personal desire de termination craziness Along line KRC holds its annual First Frosty Fingers Fun Fly January 1 no matter what weather evident data format plane performance generally bet ter respects cooler drier months thats peculiar Electrics Lets break flight-year' profile down little Being sport flier fly its enjoyable convenient Specifically find evenings weekend mornings gratifying relevant because best thermal conditions part activity part data have collected Thus can safely view happy Electric flyin facts herein being factual conservative well nothing contrived Good bad flights alike graphed can confidently read see yourself what Electric performance can like can compare experiences ones youve heard about comment about things may hear flight watch always seems either too short too long depending upon point being made way flight times shown clocked launch landing nearest second However purposes simplicity graphing times shown rounded larger fractions minute Profile 1 powered glider Ive frequently mentioned Spectra design first performance profile well look Spectra-Soar glider member Spectra family Recall Part aspect Spectra design versatility different electric power systems can have used model Remember view what follows example nothing magical about Spectra Most planes similar charac teristics should perform comparably first tangible lesson 'what flies way another involves virtually everything written far series Fig 2 composite histogram two Spectra-Soars Together 283 flights charted 1982 1983 date should perfectly clear design 12 13-mm airplane average no ther mals course some longer flights shown thermal-assisted fact some long off graphs scale Some flights short test hops quickies end day vast majority flights piled up middle chart ones count Theyre ones should able equal time No adver tising hype friends just facts Lets look some other things Fig 2 Spectra-Soar #1 #2 belongs friend Spectra #2 data included just prove can exhibit same nominal performance However since has accumulated data lets look closely Notice 1983 year-to-date data plotted directly top flight infor mation 1982 peak essentially same fashion 165 data points flights plotted 1982 83 flights 1983 no different character means after first group 165 battery performance remained exactly same next 83 flightson premise total flight time average gauge battery performance clearly supportive position Part 4 bat teries last hundreds flights given proper care Now big news data accumu lated Spectra #1 five different motor types using same battery six 12 Ah cells motors used equally same number flights basically no difference total average flight time among motors some motor/prop combinations burned power climbed ag gressively shorter time total flight times less same preceding paragraph heavy stuff friend may want read again effect saying no matter FArh IQSU Al Fig 2 shows cnaracterstics two Spectras authors identified No 1 text the right John Hickeys Spectra other V-tail Six varia tions used members KRC Model convenient size transporting inexpensive motor system provides plenty power Chart shows provides satisfying flights all-white clean-lined Persuader design convinces people Electric can Pattern aerobatics pretty well planes performance has never drawn criticism instead has re ceived plenty acknowledgements holds KRCs record rolls-per-minute FIGURE ONE 1982 ELECTRIC FLIGHT PROFILE FOR B KOPSKI 120 100 80 60 40 U CD Li Li 0 w -m z 20 0 u J F Spectra-Soar Powered Glider Vital Statistics Wing styleRectangular Wingspan67 Wing chord constant8 Wing area planform536 sq DihedralPoly Wing frame weight45 oz Wing weight covered6/3 OZ AirfoilFlat bot 12% turbulated Tail assemblySheet balsa Tail weight covered1 oz Fuselage construction sheet box Fuselage weight complete3 oz RadioThree channels used Controls Elev Rud Mot ON/OFF prop stop Radio battery250 mAh Radio weight7 oz Motor batterySix 1 2 Ah cells Motor controlMicroswitch Battery weight12 oz Motor Various Astro Leisure Mabuchi DriveDirect PropsVarious 6-4 8-6 Motor/prop weight6-7/2 OZ Misc weightApprox 2 oz Total plane weight3839/z oz Power system weightt920/2 oz Wing loadingl0--1O5 oz/sq ft what appropriate motor suitable prop use plane flies about same total time same battery charge Thats just true plane should hold true similar plane remember Part 4s discussion about batteries described ways charging including conservative charging technique method does fill battery maximum stops short about 20% average 25 flight data Fig 1 such charging other examples course longer flights would result used digi tal charging Ive said before dont care clear kind airplane charge fly will keep air almost continuously Oh such Electric Elation Now lets take detailed look Spectra-Soar Remember plane similar example should perform comparably FIGURE TWO SPECTRA SOAR FLIGHT TIME HISTOGRAM D 1982SPECTRA #1 1983 TO DAIJ E SPECTRA #2 TOTAL FLIGHTS 283 II III II I 8 9 10 II 12 13 MINUTES II I I I 4567 7 ~FLEJi 1111111 14 15 16 17 18 19 20 21 So much fine details Lets step back look bigger picture Par ticulars stand out tabulation clude fact power system about half total plane weight typical number Also battery about 30% total plane itself light also strong holds record consecutive loops KRCa real wing-tester wing loading typical electric-powered gliders Ive seen Actually wing loading easily improved wing area can increased far rapidly corresponding increase overall weight statistics key plane light need lightness license weakness plane must have strength right places overall dur ability survive year after year routine handling Later well see some ways help accomplish Now lets get back motors props motor/prop combinations used model include two Astro OSs pn 2107 now discontinued 7-6 8-4 Top Flight Nylon Astro 075 XL 7-4 7-6 8-4 Top Flight Nylon last two much too large Leisure LT-50 Pattern Wind 6-4 7-6 Top Flight Nylon 7-6 too large Cox Gray Mabuchi RS-5505-6530 Mabuchi 550S both using 7-6 8-4 props practical purposes total flight times combinations virtually same As additional point interest combinations Spectra friends Spectra #2 has flown original Astro 05 pn 2107 economy motor thats perfectly satisfactory application 2107 originally marketed eight-cell 55 Ah battery GRAPH REPRESENTS TOTAL OF 511 FLIGHTS OF 8 ELECTRICS VIMr A50ND MONTH U Iz CD - Li LJ -o w -m -z 20 IS 10 5 0 swinging 6-4 prop documented flight performance Spectra #2 six 12 Ah cells larger props As esti mate based other planes experience eight-cell 55 Ah pack would result Spectra-Soar flights about 6 7 mm Profile 2 aerobatic plane some reason measure Electrics model ers minds well poorly Pattern flying particularly curious because part people Ive seen Electrics arent aerobatics dont seem least bit concerned having fun blowing holes sky Nevertheless find phase flying liking well take closer look application First what Ive seen Elec tric no match conventional glowpowered Pattern planes least very long flights Thus youre thinking ing what big boys forget other hand relatively simple aero batics 5 mm liking read What relatively simple aerobatics Ill list what have either seen done myself inside outside loops aileron rolls sustained inverted flight spins knife edge Immelmanns hammerheads split-Ss long answer de picted Fig 3 Fig 3 histogram flight time number flights Persuader name has purpose plane convinces people Unlike glider flight time aerobatic plane much longer useful motor run time Such plane depends continuous power perform Also un like glider motor prop choices limited because efficient power deliv ery required desired flight charac teristics given power system aerobatic plane flight time determined large extent nature flight con stant maneuvering flight windy condi tions very hot humid air average power consumption relatively high contrasts power consumption flying done straightaway speed increases prop unloads cur rent drain reduced flights longer Putting another way longer flights will result simple up-and-down-the-field flight aerobatics listed previ ously mind lets examine Fig 3 Notice general lack peaking flatter broader shape histogram en velope like think plane 4 5-mm machine depending mood because influences fly course data conclusions assume equal charges flight data shown essentially flights resulting conservative charge limited number cases chose digital charge resulting flight about /2 mm longer apparent average 4 mm relatively 1983 DATE FIGURE THREE PERSUADER FLIGHT TIME HISTOGRAM 10 1982 I C -J LL 5 0 w zri 0Ii 1020304050II62b30405 345 MINUTES 25 20 U 15 CD U 0 U 10 z 5 10 20 30 40 50 6 FIGURE FOUR 1980 THRU 1983 TO DATE J-3 SPORT SCALE FLIGHT PROFILE II 3456 MINUTES few shorter flights graphed almost due either 'short charge' purposely-terminated flight Unlike Spectra Persuader has flown Cobalt 05 six-cell 12 Ah battery say workable power system Persuader derived Wasp published Jim Zarembski RCM have seen several Wasps KRC Electric Fly events powered both Astro Cobalt OSs Leisure LT-50s both impressive performance fact Jim lists several candi n II'I' 78910 date power systems Wasp plans Since Ive used combination above can report Incidentally Persuader will fly aerobatic maneuvers listed Since has no rudder control maneuvers requiring course out Since Ive now begun talk about makeup plane lets move Vital Statistics Persuader As case Spectra Persuader example Similar designs should perform comparably Continued page 44 nO4 AVI FIGURE FIVE PLAYBOY OLD-TIMER FLIGHT PROFILE 6NOTE NOT SHOWN ARE FLIGHTS 15OF 45 MIN 31 SEC AND CD37 MIN 39 SEC J4 CA LA3 0 U2 zII 0FJF1F1 0 10 02530 MINUTES FOUR CYCLE ENGINE MOUNTS High tensile aluminum alloy Precision machined polished Hardened socket cap screws included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENYA 601295 No 31995 ENYA 901295 No 31452 HP VT 21750 No 31644 HP VT 49895 No 31654 MAX FS 40895 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201995 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45895 No 32195 SAITO FA 1201995 AT MOST HOBBY SHOPS OR OROER DIRECT Send 100 tor 12 page Illustrated catalog Handy Tools Precision Sanding ALUMINUM EXTRUSION SANDING BLOCKADJUSTABLE TENSION use RUFF-STUFF82HAND BELT SANDER Self adhesive sandpaperFIRMLY HOLDS PAPER Makes Sanding InSmallFOR EASIER SANDING Areas Snap$220 Wont Wear Out~~A ed flats curves Handy Use Handy Hold 11 inch $235 Easy Use 22 Inch sasoextra strips $1 40 APPLIED DESIGN CORPAdd 20% torcatalog 738 PENN STREET EL SEGUNDO CA 90245 torPoatago Persuader Aerobatic Vital Statistics Wing styleRectangular Wingspan37 Wing chord constant8 Wing area planform296 sq DihedralNone Wing frame weight3 oz Wing weight covered4 oz Airfoil . NACA 2410 semi-sym 10% Tail assemblySheet balsa Tail weight coveredNo data Fuselage construction . sheet box Fuselage weightNo data RadioThree channels used ControlsEIev Ail Mot ON/OFF Radio battery70 mAh Radio weight5/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorAstro Cobalt 05 DriveDirect Prop7-6 Top Flight Nylon Motor/prop weight6 oz Misc weightApprox 2 oz Total plane weight33 oz Power system weight19 oz Wing loading16 oz/sq ft Again basic airplane very light about 85 oz structure theless strong durable must withstand aerobatics survive general flying landing handling Notice power system about 58% total weight plane itself less 26% Later will see quantitatively important weight really As special point interest notice mention 70 mAh radio battery con sists four cells removed General Electric 9V Ni-Cd consumer-grade battery provides enough power four flights stop four discharge re charge field As writing have 436 flights pack first used earlier aerobatic plane before finding home Persuader may very well have read about heard better performance described have Im sure exists other extreme Im sure have impression Electric gliders What presented pro file real workable electric-powered aerobatic plane Theres no magic involved anyone used flying prop will have learn fly wing Nevertheless should able match kind performance beat please let know remember Im easily impressed lot shouting hand-waving about great some flight seemed Theres too much sort prop wash already Instead come 1984 Electric Fly persuade Profile 3 Sport Scale perhaps ming Electric applications Continued page 132 AALAA-I- Electric flight challenge sport flier competitor alike Watts Up introduction should gratifying Happy landings Radio Technique/Myers Continued page 39 ing microscopic whiskers through sulating paper can blow out whis kers high-voltage charge really trust cells afterward dont So away workbench lot Chargemaster may prove fine tool Ace RC Inc Box 51 lE Higginsville MO 64037 George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 [ writing advertisers mention t read about ModI Aviation J-3 has proven over years real crowd pleaserprobably because its good old J-3 fact touches ob servers plane built winter 1978-79 first flown March 3 latter year didnt know till later Bob Boucher Astro Flight design ing Porterfield same time two planes very similar date J-3 has accumulated 334 flights drop oil has soaked 150 depicted Fig 4 Prior 1980 keeping record flight time date number flights thats reason about half plotted Fig 4 obvious five-mm airplane can see vital statistics what details Heres some information about plane J-3 scratch-built using Sig plans guideline Since electricpowered knew plane itself lightweight rugged kit version glow engine would set about redrawing plans choosing construc tion techniques wood sizes consistent application also changed air foil 12/2% flat-bottom section Dihedral added lieu ailerons Result real charmer Admittedly 1-3 fair-weather flier does handle wind well defi nitely fun fly calm air typical flight starts small amount ground handling followed taxi takeoff Fol lowing climb-out back off proportional throttle cruise around Flybys snapbeautiful experience plane pussycat handling several times Ive nearly hypnotized myself flying myself Usually Ill some touch-and-goes two inside loops playing throttle control needed plane glides nicely note some longer lift-assisted flight times Fig 4 generally keep power whole flight varying amount de sired effect About third time have enough power left after landing taxi back pit area Otherwise power out have bring back dead-stick 1-3 good example inadequate battery cooling Im fourth battery heat reason time design construction what looked like good installation cooling has proved adequate Whatever knowledge may have Electrics has come cheaply 15-size motor used plane new version plane new so-called black back 15 current model Astro 15 rather different motor Ferrite 15 uses 12 cells 12 Ah may install someday get longer flights overall weight will increase about 9 oz estimate flight time should increase about 8-9 mm Look over vitals get general idea candidate designs around would perform comparably would require some modeling effort make suitable electric power J-3 example Astro Porterfield 132 Model Aviation Watts Up/MarronElectrics/Kopski Continued page 130 Continued paqe 44 jSSOATES INCNEW MO 13 N IS Dont bee stung AIDS CLOUD WAYHAYWARD CA 945S OS4ONCsalaENYA GUARANTEED CY NO 5310 Os l2O4cy NO 5317 HOT SHOT Hor~US PAT 4405890 Hand held rechargeable glow plug energizer size engine uses gtow plug Small enough carry yoijr shirt pocket Makes dry cell batteries power losing wires thing ot past Easy attachment cowd engines Reinforced extra hard use Can charged upto 1000 times Uses HEAD LOCK glow plug connector MODEL PRODUCTS CORP positive corinec tion tothe glow plug 90 day unconditional guarantee plus limited warranty up year Complete instructions charger Available dealer order direct Visa Mastercard accepted Add Si 50 postage power convenience $1995 Without charger $1595 b & r Hobbies PO Box 192 Oscoda MI 48750 [517] 7393549 Making Leisure Time Enjoyable excellent kit example way opinion roughly size plane power system about minimum neces sary reliable ground handling takeoff grassy fields under varying weather con ditions Except some occasional tail dragger-itis plane always gets off J-3 Sport Scale Vital Statistics Wing styleScale Wingspan70/2 Wing chord constant10 Wing area planform sq Dihedral5 deg/panel Wing frame weight6/4 oz Wing weight covered10% oz Airfoil12% flat bottom Tail assemblyBuilt-up Tail weight covered2 oz Fuselage construction tick built-up Fuselage weight No data Radio Three channels used Controls Rud Elev Mot Radio battery 250 mAb Radio weight 8 oz Motor battery 16 cells 55 Ah Motor control Variable speed Battery weight 16 oz Motor Astro 15 reducer Drive Belt Prop Top Flight 12-8 wood Mot Red prop weight 13 oz Misc weightApprox 1 2 oz Total plane weight68 oz Power system weight .. 30 oz approx Wing loading14 ozIsq ft Otherincluded above Wing struts Hdwr1 oz Wheels Trexler lOG2 oz Comp LG Assy4 oz Again same message plane must lightweight Please dont confuse being weak fragile such need notbe case particular model has over 300 flights approaching its fifth birthday 1-3 has its share Profile 4 Old-Timer recent plane Playboy Cabin Old-Timer built Leisure kit am ordinarily kit builder wanted new plane hurry Ive wanting Old-Timer years natural As writing plane about two months old dont have nearly much accumulated flight data other examples plane perfectly delightful fly product review product review product review modeler likes complete sets tools very good value selec tion six screwdriver sizes included set hex-nut drivers precision wrench es hex-nut key drivers assorted Phillipshead screwdrivers sizes convenient modeling purposes Altogether get 21 pieces plus handy tray $700 product review product review product review Old-Timers everyones preference everyone seems enjoy watch ing fly currently holds KRC Longest Flight Record 45 mm 31 sec can see Fig 5 charac teristically 10 16-mm plane suspect accumulate flights peak will reached flight profile will probably fall around 13 mm plane handles wind surprisingly well its light wing loading poly dihedral undercambered airfoil Lack ing steerable wheel plane doesnt much ground will take off unassisted time low grass some headwind ground roll ap proaches zero enough wind some tricky controlling plane will fly back wardswith no bad tendencies Like gliders would normally think putting variable-speed control OldTimer No doubt because Free Flight conditioning just get thing up high possible quickly possible However Im stuff anymore no fields now wish built proportional motor control Having vari able throttle adds new dimension already enjoyable airplane found out 1-3 first flown OFF-LO HI power control ways Playboy similar excellent candidate feature course youre Elec tric O-T competition just stay ON-OFF motor control As before vital statistics give some detail Again lightweight oper ative word cannot stress point too much have seen magnificentlyconstructed Electric Kadet equally supurb Flyline Megowcoupe truly fine craftsmanship same modeler fail fly solely because planes too heavy say least planes bit over-embellished extra struc ture lots heavy wood pieces various nif ty fittings Continued page 136 March 1984 133 ALL SHEET ONE PIECE AAA GRADE KILN DRIED SANDED TO CLOSE TOLERANCES PED 100% 17318x1112 261/2x2 30 37 rough landings aborted takeoffs hectic fun fly events hangar dings once spun down because ran radio battery down Its its third set wheels Ive used test purposes carry dead weights 8-oz I-lb iron blocks Other pilots have flown including young boy never held transmitter Obviously has taken much abuse Screwdriver Tool Set @ $700 Polks Model-Craft Hobbies Dept 2084 346 Bergen Ave Jersey City NJ 07304 tel 20 1/3328100 POWRZOOM winch serious flyer demands extraordinary launching power sailplane particularly F3Bscale cross-country Included antikiting/ antibacklash brake 2200 ft braided nylon 160 lb line manual tow drum foot brake new specially engineered motor much capable drum speeds 5000 rpm launching 3 meter sailplane ijchoose speed select pulleys j% launcha minute flights use companion RETRIEVER $250 Electrics/Kopski Continued page 133 Im convinced both planes good candidate designs Electric structures must beefed up lightness Personally felt terrible because somehow failed convey importance lightweight flying friendnot once twice Being determined stal wart modeler now off finishing two electric-powered Old-Timers Buzzard Bombshell Playboy Remember what said earlier series suggest thinking terms quarter ouncesfour make up ounce four make up quarter pounder Playboy Old-Timer Vital Statistics Wing styleElliptical tips Wingspan68 Wing chord constant9/2 Wing area planform576 sq DihedralPoly Wing frame weight4 Oz DAVE V SYSTEMS CORPOR ION ONE WOOD LANE MALVERNPA19355 215644-0692 Write call information Wing weight covered6 oz AirfoilUndercambered Tail assemblyBuilt-up Tail weight covered11/2 OZ Fuselage construction uilt-up stick Fuselage weight covered 31/3 OZ RadioThree channels used Controls .. RudElev ON/OFF Mot Radio battery250 mAh Radio weight6/2 OZ Motor batterySix 12 Ah cells Motor controlMicroswitch Battery weight12 oz MotorLeisure LT-50 DriveLeisure 251 gear Prop10-6 11-6 Mot gear prop weight7/2 Oz Misc weightApprox1 2 oz Total plane weight41 oz Power system weight20 oz Wing loading1O/4oz/sq ft need new timers fly like plane second installment Planes Flying next month 11 look some ways build strong lightweight model structures Therell some rules thumb will help maximize Electric achievementand some thoughts what plane choose Meanwhile please direct comments questions SASE author Bob Kopski 25 West End Dr Lansdale PA 19446 RC Scale/Wischers Continued oaoe 47 made exclusively model cant used another plane Too much lost model isnt rebuilt large investment time money normal Scale modeling makes sense expend effort direction preservation No 1 admonition make certain good battery life before flying session since batteries common source problems lead air plane damage Cyclers have place arent really insurance against failure much inclined rely upon expanded-scale voltmeter resistance load quick battery check first time voltmeter needle drops sud denly doesnt come up proper level good Scale model will have saved possible destruction next flight Overworked receiver cells carrying load swarm servos subject vibration weak link RC sys tem Using larger-capacity cells isnt solu tion because dead cell drops voltage below requirements Larger cells per mit flights larger servos 18 Scale airplanes nine flown regu larly have same charging jack sake convenience Deans-type socket switch wiring harness Plug ging meter simple matter leaves no excuse omitting check same meter can used checking trans mitter batteries peace mind alone its worth $16 price Tower Hobbies Second importance models bal ance point Tail-heavy models can flown incidence angles wing stabilizer properly set up burden controlling such unstable beast too great experienced fliers nose-heavy model may WING SPAN4 WING AREA198 51 ENGINE15 WEIGHT34 IS Babe body loan wing sheeting die Cut formert rolled planS 2 nSf. 15 HIGHLY AEROBATIC DESIGNED Weller Nu Dentouk Jr PEPPERMINT PATTIE 15 STINGER II CMASTER KJT Div BAR/RICH SALES CO 2 FAIRWAY-HANNIBAL M0834G1314/221 8853 WING SPAN 30 WING AREABOA sqin ENGINE45 EIGHT5s balsa unstractiOn die Cut lornCrs ribs 2shts InlI Claw plans Good ground Seedling gaelIc lending good first bipe FU LLY AEROB ATIC NEW R/C BOOKLET Answers questions often asked want get started R/C flying PLUS troduces best airplane start GOLDEN FALCON receive Copy ____________ SEND $200 TO ST CROIX OF PARK FALLS LTD PO Box 279P Park Falls WI 54552 136 Model Aviation batter inc1d * plus shipping