Radio Control E lectrics Bob Kopski UPCOMING Electric meets Id like remind readers its policy pleasure spread good word about planned activities columnbut must know about adequately advance Hint Hint June 21 22 tentative Daniel Boone Silent Flyers 7th Annual Two-Meter/Electric RC Contest Electric event will use one-charge duration proposal presented June column information please contact Jerry Zeigenfuse 8 Craig Dr Read ing PA 19606 phone 215 779-3229 June 28 29 Boeing Hawks 4th Annual Elec tric Fly-In Seattle meet forms electric-powered model aircraft prizes will given Best Entry Event Most Acrobatic Longest Flight Surprise Events Mitch Poling Model Builders Elec tric columnist will host Electric Clinic information please contact Bernard Cawley 210 37th SE #43 Auburn WA 98002 telephone 206 939-1778 can also contact Dave Katagiri 206 248-1024 July 13 Polk County Soaring Eagles Lakeland FL announce First Annual Elec tric Fly Plaques will awarded fourth place two Soaring events information please contact Leonard Postage 6103 Andrea Dr LakeLand FL 33803 telephone 813/6441942 home 813/293-3434 work July 20 South Shore RC Club based Bridgewater MA presents Second Annual Electric Fly organized fun-fly no classes other limitations Electrics welcome will prizes Best Model Most Aerobatic Longest Flight One-Charge Duration event latter following format suggested June column info please con tact Charles Sylvia PO Box 775 Middle boro MA 02346 telephone 617 947-2805 July 27 SAM 76 Old-Timers Annual Meet Hatfield PA Electric event will open model aircraft complying applicable SAM OT model requirements nickelcadmium Electric power system may used information please contact Dave Ritchie 2908 Truman Drive Hatfield PA 19440 telephone 215 362-2933 August 16 17 Electric Model Flyers Chicago host First Annual Electric Fly-In planning carbon copy KRC Vice-President Les Adams regular KRC affair tells Electrics wel come some planned events include Most Aerobatic Best-Looking Long est Flight Best Design maybe All-Up Last-Down can get info Larry Sperling 2517 Brush Road #102 Schuamberg IL 60195-3910 September 20 21 Seventh Annual KRC Electric Fly Hatfield PA years meet continues famous low-key all-Electrics are-welcome tradition also includes some scheduled events like Longest Flight Up Last-Down Most Loops per minute Aerobatic Scale years meet breaks tradition first time allows KRC members actively compete activities information contact Ken Stinson 140 Hopewell Lane Telford PA 18969 telephone 215 721-0248 Battery cooling facts Electric life some readers interested formation matter Batteries can get hot two ways during improper charging during discharging charging properly done very little associated heating Generally heat produced during dis charge flying tries charge already-hot battery ofttimes heat easily generatedusually much charging battery normal temperature Thus during course Electric flying some form battery-cooling advised absolutely necessary Modelers have developed several ways deal matter opin ions preferences vary Lets look some particulars can select what seems best use Battery installations fall roughly two Economy vinyl cassette carrying cases can stripped labeling flimsy organizer tray allow stuff meterand test ieads tools whatever L Test and/or charging leads can kept untangied using slip-on tubes R Tubes shown inciude sections malihig tube MonoKote roll rocket tube Bob ilkes plastic 35mm fiim containers bottoms cut out 48 Model Aviation Look both ends dryer see innards iooksomething Ike cant see right away disassemble unit remember Bobs motto What man can assembie man can disassemblel Save ex cess partsmost can useful sometime Whats cheapie hair-dryer got flying Electrics can gut blowerto help cool battery pack fore charging dryer typical type look Get cheapest Finally treasure neat little Mabuchi similar DC motor high-perform ance blower assembly Bob has tried severn different dryers has found motors run well 12 volts DC dryer mo tor power obtained tap heater element diode rectifier does great job cooling battery packs categories 1 battery easily removed model 2 battery kinds built difficult get out first kind offers advantages easy interchangeability packs pack can cool another being charged yet another being flown some such Geneo ally model structured may tend weaker side given some hatch other interruption fuselage structure used access pack Nevertheless popular workable approach Ive seen modelers favor other hand installations have sorta-built-in batteriesits easy get em out Also prefer have planes spare packs Thus 1 must use some scheme other removing hot pack al lowing cool before recharging flying In-plane battery-cooling can effected either cases done arranging in-flight airflow around through pack usefulness effectiveness such approach varies both model type quality installation/airflow design Some examples may help under stand better Consider duration plane can glider Old-Timer sport modelany plane flies significant portion total flight power always encourage flowthrough air cooling kind model because makes sense mind use gliding time model motion permit cool ing air reduce battery temperatures tained during power-on portion flight Often depending glide time no additional cooling needed after landing recharging can begin immediately course some serious enthusiasts may want blemish otherwise sleek lines clean Soaring machine air scoops air outlets same kind thinking often ap plies sleek Aerobatic Pylon planes latter case power used nearly flight long cooling glide-time just isnt available Thus cases about option available remove pack cooling recharging/replacement Being sport flier installations equipped air-intake scoops air exitstotally sleek Some planes fit first category described theres usually plenty glide time cooling Some ever spend power continuously rela tively short time cooling air does flow inflight limited value latter planes land hot batteries sometimes hot Continued page 135 Hot2tav Horn Old Tirner LAlks born 7J&1/1/&I i LeaZas 6 GAS PIOSEL JI/toaLL7j5 RtCORO BREK0R 1941 BROOKLYN DODGER 56 Cabin s*sSsNEWEST* Retail $5295**INTRODuCTORY PRICE* $3900 1938 Record Breake- 96 $6956 1939ZipperS4$5356 1938 Kloud King 63 $4236 1941 Brigidier 56 $4076 1941 Super Quaker 78 $3276 1940 So Long 5053036 1936 Buccaneer 04 $5996 1938 Clipper MKI 72$4156 1937 Dallaire 108 $75 16 1935 Miss Aserica 84 $7196 1941 Playboy Sr 00 $5116 1941 Playboy Jr 54$31 16 1938 Powerhouse 04 $53 56 1940 Sailplane 70 $8476 1938 Trenton Terror 73 $40 76 1940 Ranger 46$3196 1939 Korda Wake 44 $1916 1939 Mercary 72 $5836 Itits qualify SAM events FE & RIG feature highest quality machine cut & sanded parts Superior Competition sheet strip wood wire & window material Plans orig FE models esail convertible 3ch R/C KITS Sailplanes Electric power Gas Hobby Horn SENSOAR Glider 78 $1800 Midway Model GNOME RIC Hand Launch Glider$2400 Jolly Models FLINGER R/C HLG 58 Span $2400 Midway Model FAST EDDIE Acrobatic /05 Elec$1900 Jolly Models ELECTRICUS Electric Glider 0Ss$3250 Leisure PLAYBOY SR 67 Gear 05 Elect $3000 Astro ASTRO SPORT 37 Direct 05 Elect $2250 CA Addressees add 6% tax 15173 Moran St [Al Send MO VisaIMC#-eExp PO Boa 2212 Check [allow up tO 30 Westwinster Ca 92684 days CK clearance 17141 093-8311 COD Exact Charges plus $150 Hdl Cash Only [Aft Hrs 714 89512031 NEW P-30 PROP Newest design Adds up 25 sec flight pull better free wheel Introductory price 8O kit specials kit specials kit specials kit P30 Souper 30 Kit Y lb FAI rubber 1 new P30 prop List -$1825 hrough July86plus $150 UPS Fun Bird P30 Kit lb FAI rubber 1 new P30 prop List -$20252O Through July 86 pluaSi SOUPS Catalogr free orderP0 Box 3867 Torrance CA 90512 ZONA SAWS famous line hobby saws Razor #200$255 - Universal #500 $295 Saw set #100 $450 Replacement Blades available dealer ATTCHEKT ON-Board Battery Tester Saves Time. Saves Models B AiTCHEK RX-1 $1495 eln USA VV44 New Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 19141 462-6452 PO Box 1808 Poughkeepsie NY 12601 July1986 49 screw pressure would bleed away through tiny space between thread root tube used fine-thread screws inserted fulllength screw head sealed against tube end cut off exactly square 900 Another myth proved wrong pressure build up some mufflers homemade great enough push screw partly out tube pressure leaks away varying amounts variation fuel flow thereby introduced can cause sagging enginea condition can differ between flights worse screw has sometimes blown completely out tube end hot day tube soft Remedy use larger-diameter screw plug though easily inserted removed saves lot unnecessary needle valve tweeking before flight philosophy needle valve has set forget fact some most-often-flown models dont have convenient access needle valve setting changes look reason elsewhere fuel system plugged filter example Scale documentation source have drawings articles Scale modelers prod ucts Robert C Morrison past 50 years Repla-Tech International catalog lists sort information modelers seek Scale documentation new 1986 catalog No 1 aircraft includes three-view drawings acrobatic aircraft Reno racers civil military aircraft drawings Morrison Karl strom Donaldson Carter Aviation News Hirsch raceplane drawings MAP scale draw ings England complete line Koku-Fan drawings Japan Also listed Scale flying model plans Morrison MAP line plans England Part II catalog lists color documentation photos Repla-Tech collection photo packs Scale Model Research Bob Banka also long list blackand-white photos late raceplanes Golden Age raceplanes Golden Age commercial mili tary civil private aircraft special section lists color photos taken 1985 Reno races Unlimited-class racers well T-6 Texan class Formula class worth $3 catalog just know what avail able Roberts address Repla-Tech Interna tional 48500 McKenzie Hwy Vida OR 97488 Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Aerobatics/Van Putte Continued page 45 fifteenth coat primer now working way down grades jewelers rouge last several coats rubs off inside cats ear Now model sits resplendently impeccable smoother babys bottom radio installed skill comes years cold nights spent cell bately garage Pushrods straight true Servos mounted properly Battery receiver lovingly encased foam arrives flying field has flown airplanes veteran weather perfect wind just right engine starts easily gentle firm touch upon needle valve settles excellent running mixture Frequency-pin hand ribbons gaily flying antenna man steps new plane through pits toward flight line con descending envious glances behind him calm trembles neither doth quake hours labor have come fruiting consummation moment truth hand looks left looks right No landing runway clear airplane released insouciance beyond years taxis out turns about lets rest last long moment upon mother earth beautiful palpably strains fly Now rolling Faster yet faster engine fairly sings little lines around corners eyes begotten years flying models against sunny sky gently lifts runway thumbs sensuous upon sticks airborne flies flies solidly straight Now see bank gently See bank more Good heavens fool rolling thing 10 feet off deck Look roll roll roll down down thenWHAAAAP Several moments later Yeti way up Himalayas feel ground go umph under big feet still quiet wreckage retrieved studied guess what Somewhere birds will singing somewhere hearts may well light hero hooked up ailerons back wards thats fact wise man once commended notion having friend look airplane over before flies first time sober friend given late-night social rambles suffering confounded brain caused too much airplane-rubbing insides cats ears Humble pie may good moral fiber dunno about sure wont bring back smashed airplane course Ive never done anything like thanks anyway Dave Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 RC Electrics/Kopski Continued page 49 motors latter case cooling accom plished ground before recharging battery removal using small blow er positioned air intake scoop Its amaz ing very quickly some moving air can reduce pack temperature Several minutes takes Whatever way choose go battery cooling sure go noway Hot packs must cooled before safe effective charging can done battery often expensive part power system capable hundreds flights charges discharges proper carewhich cludes among other things cooling-beforecharging task heated packs informa tion some useful photographs covering general subject area can found earlier issues Model Aviation October December 1983 January September No vember 1984 February March July 1985 Basic electricity Believe still some straggler topics remaining ongoing discussion analog moving-needle multime ters Id like wrap up before con tinuing topic digital multimeters DMMsContinued page 138 DIA PITCH 634 7283 3* 4 56 833&3/44568 8*4566* 94 566* 7 7* 104 5 6 6W 6* 7 8W 106EW II 4 6 7 7* 7* 7&3/4 8 11 6EW 11* 67 12 4W 5 5W 6 13 56 14 56 15 56 16 678 FOUR-CYCLE TAILORED HELICAL PITCH 126 6* 7 7* 8 136 7 7*8 146 7 7*8 1567 16678 PYLON RACING 7SN SiN 8&3/46* 6&3/4 7 7* 7&3/4 97 7* 7&3/4 W Wide biide EW ExtFa wide PRICE $149 $179 $189 $199 $199 $209 $219 $229 $239 $239 $279 $359 $459 $659 $849 $299 $389 $489 $689 $989 $279 $289 $289 H Nalyaw SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES COMPLETE INVENTORY OF CUSTOM & STOCK PARTS OLD TIMER SUPPLIES CARBON FIBER COILS CONDENSERS SILK TRANSISTOR IGNITION SYSTEMS TIMERS ETC REPLICA OR WICK ENGINES NE WI! 1/2A PLAYBOY SR FOR 1/2A TEXACO RIC FF ELECTRIC OR SPORT KIT $2995 ORDER BY MAIL OR PHONE 714 830-5162 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRIES INVITED ALL PRICES ARE POSTPAID ON ORDERS OVER $10 ORDERS SHIPPED FIRST CLASS MAIL WITHIN 24 HRS CALIFORNIA RESIDENTS ADD 6% TAX July1986 135 OUR INVENTORY AVERAGES OVER 8000 PROPS! SPECIAL PRO SERIES RC Electrics/KopSki Continued page 135 Two terms always associated meters accuracy sensitivity Both often used varied ways both easily confused misunderstood Accuracy simply description good meas urement made given meter analog meters accuracy often ex pressed percent full scale typical number ull Scale FS means example such meter 10-volt scale accuracy scale would 100 plus minus 03 volts subtle sneaky too specification also means that same olts applies over entire scale Thus taken literally meter accuracy speci fied manner means reading ac curacy can much worse percentage readings taken lower portions given scale example nominal 30 volts applied read 10-volt scale accura cy reading would given 30 olts grand total plus/minus 10% 3% actual practice Ive never seen such miserable degradation actually occur wary anyway other ways accuracy can speci fied such simply have FS designation illustrated previously example Radio Shack 22-204 multimeter discussed earlier installments miniseries has stated accuracy simply 3% some ranges other values other ranges Such specification means given readinganywhere scaleis within three percent real true value Such much better circumstance average first example general since multimeters offer variety both functions ranges also variety accuracies listed Usually DC voltage current ranges accu rate AC ohms ranges less accurate Agaln different manufacturers spell out different ways sure check manual particulars apply instrument Later well see DMM accuracy specified what means two terms confusing sensitivity Ive seen term used several ways Ill simply illustrate few Some use sensitivity describe load voltmeter places circuit component under test Remember voltmeters re quire some small current own make needle move current comes what being measured measure some thing often change As example some voltage scales Radio Shack instrument have sensitivity 50000 ohms per volt simply describes size value multiplier resistor switched place selector knob set some particular range exam pie 10-volt range example above ternal meter resistor would 50000 ohms per volt times 10 volts 500000 ohms means instrument used range its like placing 500000 ohm resistor across whatever being measured does matter perhaps few volts being meas ured ie pointer does go full deflection ohms per volt remains con stant selected range reflect earlier lessons youll realize what really saying much current needed instrument move pointer full scale example its 10 volts divided 500000 ohms 20 microamps million times less current Elec tric motors can use meter current same full-scale deflection range having same sensitivity Obviously such tiny current would bother motor battery However electronic circuits operation would severely disrupted such measurement burden simple obvious case would occur example example instrument/range used meas ure voltage across 500000 ohm resistor particular instance new total resis tance would become 250000 ohmshalf originaland circuit measurement status would severely changed 100% reading er ror could easily result Finally case accuracy sensi tivity used varies greatly among meters among scales given instru ment check manual its important Sensitivity sometimes used describe 'how little takes make needle move' Used way term similar term resolution applied servos much input signal required make needle ser vo arm move stopped motion direction next slightly-greater position same direction Used way sensitivi ty really description pointer-bearing friction Unless instrument has suffered mechanical damage movement has come contaminated dust like need concern yourself version sensitivity Finally Ive seen two other obscure uses word doesnt matter youve made far through miniseries know youll reasonably need know about analog multimeters Thats again folks Ive used up space allotment yet another month Please direct comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 make point attend Electric meet year Take non-believer youll change life RC Pylon Racing/Hager Continued page 50 Standard class pilots aircraft get best time possible Standard class pilot will run best time Expert pilot coaching training published results will prove stock pilot skill deter mines winner Compare above other Pylon events have over $200 engine aircraft engine aircraft cost less $100 speeds over two minutes against little over minute means midairs have several aircraft just keep fly ing found club built some 20 Formula 500sbut two flying condition first race Formula 500 trainer third-year Championships held September 1985 Corvallis OR Seventeen pilots Expert Standard Class qualified Championships set aside 138 Model Aviation DCO SKY DfI[ 65 Ignition Approed 90 Day Warmitv Twin Ball Bearing Crank Americas finest old-timer engine Originally designed Hassad & Havlik replica engine resonic tuning ensures continuous flow power through speed range Look out green goodbye red headT&Ds replica Sky Devil 65 $279 less coil cond & plug Calit residents add 6% sales ta ORDR DIRCT T&D RESEARCH Associis 6371 El Cajon Blvd Suite 115 San Diego CA 92115 SI FOR BROCHURE MASTER AIRSCREW ~RAhfW 12x8 Folder1195 15x12 Folder ..1295 05 Direct Drive Prop Adapter395 Available thru Dealer WINDSOR PROPELLER CO 384 Tesoonl Ct Santa Rosa CA 95401 RON CHIDGEYS TIGER TAIL 4 800 sq Basic Kit $119 FihuI. Faa. F., C. ft Fly CAJUN RIG PRODUCTS 112 6081 Lot nynie LA 7inii 318 2327446 z
Edition: Model Aviation - 1986/07
Page Numbers: 48, 49, 135, 138
Radio Control E lectrics Bob Kopski UPCOMING Electric meets Id like remind readers its policy pleasure spread good word about planned activities columnbut must know about adequately advance Hint Hint June 21 22 tentative Daniel Boone Silent Flyers 7th Annual Two-Meter/Electric RC Contest Electric event will use one-charge duration proposal presented June column information please contact Jerry Zeigenfuse 8 Craig Dr Read ing PA 19606 phone 215 779-3229 June 28 29 Boeing Hawks 4th Annual Elec tric Fly-In Seattle meet forms electric-powered model aircraft prizes will given Best Entry Event Most Acrobatic Longest Flight Surprise Events Mitch Poling Model Builders Elec tric columnist will host Electric Clinic information please contact Bernard Cawley 210 37th SE #43 Auburn WA 98002 telephone 206 939-1778 can also contact Dave Katagiri 206 248-1024 July 13 Polk County Soaring Eagles Lakeland FL announce First Annual Elec tric Fly Plaques will awarded fourth place two Soaring events information please contact Leonard Postage 6103 Andrea Dr LakeLand FL 33803 telephone 813/6441942 home 813/293-3434 work July 20 South Shore RC Club based Bridgewater MA presents Second Annual Electric Fly organized fun-fly no classes other limitations Electrics welcome will prizes Best Model Most Aerobatic Longest Flight One-Charge Duration event latter following format suggested June column info please con tact Charles Sylvia PO Box 775 Middle boro MA 02346 telephone 617 947-2805 July 27 SAM 76 Old-Timers Annual Meet Hatfield PA Electric event will open model aircraft complying applicable SAM OT model requirements nickelcadmium Electric power system may used information please contact Dave Ritchie 2908 Truman Drive Hatfield PA 19440 telephone 215 362-2933 August 16 17 Electric Model Flyers Chicago host First Annual Electric Fly-In planning carbon copy KRC Vice-President Les Adams regular KRC affair tells Electrics wel come some planned events include Most Aerobatic Best-Looking Long est Flight Best Design maybe All-Up Last-Down can get info Larry Sperling 2517 Brush Road #102 Schuamberg IL 60195-3910 September 20 21 Seventh Annual KRC Electric Fly Hatfield PA years meet continues famous low-key all-Electrics are-welcome tradition also includes some scheduled events like Longest Flight Up Last-Down Most Loops per minute Aerobatic Scale years meet breaks tradition first time allows KRC members actively compete activities information contact Ken Stinson 140 Hopewell Lane Telford PA 18969 telephone 215 721-0248 Battery cooling facts Electric life some readers interested formation matter Batteries can get hot two ways during improper charging during discharging charging properly done very little associated heating Generally heat produced during dis charge flying tries charge already-hot battery ofttimes heat easily generatedusually much charging battery normal temperature Thus during course Electric flying some form battery-cooling advised absolutely necessary Modelers have developed several ways deal matter opin ions preferences vary Lets look some particulars can select what seems best use Battery installations fall roughly two Economy vinyl cassette carrying cases can stripped labeling flimsy organizer tray allow stuff meterand test ieads tools whatever L Test and/or charging leads can kept untangied using slip-on tubes R Tubes shown inciude sections malihig tube MonoKote roll rocket tube Bob ilkes plastic 35mm fiim containers bottoms cut out 48 Model Aviation Look both ends dryer see innards iooksomething Ike cant see right away disassemble unit remember Bobs motto What man can assembie man can disassemblel Save ex cess partsmost can useful sometime Whats cheapie hair-dryer got flying Electrics can gut blowerto help cool battery pack fore charging dryer typical type look Get cheapest Finally treasure neat little Mabuchi similar DC motor high-perform ance blower assembly Bob has tried severn different dryers has found motors run well 12 volts DC dryer mo tor power obtained tap heater element diode rectifier does great job cooling battery packs categories 1 battery easily removed model 2 battery kinds built difficult get out first kind offers advantages easy interchangeability packs pack can cool another being charged yet another being flown some such Geneo ally model structured may tend weaker side given some hatch other interruption fuselage structure used access pack Nevertheless popular workable approach Ive seen modelers favor other hand installations have sorta-built-in batteriesits easy get em out Also prefer have planes spare packs Thus 1 must use some scheme other removing hot pack al lowing cool before recharging flying In-plane battery-cooling can effected either cases done arranging in-flight airflow around through pack usefulness effectiveness such approach varies both model type quality installation/airflow design Some examples may help under stand better Consider duration plane can glider Old-Timer sport modelany plane flies significant portion total flight power always encourage flowthrough air cooling kind model because makes sense mind use gliding time model motion permit cool ing air reduce battery temperatures tained during power-on portion flight Often depending glide time no additional cooling needed after landing recharging can begin immediately course some serious enthusiasts may want blemish otherwise sleek lines clean Soaring machine air scoops air outlets same kind thinking often ap plies sleek Aerobatic Pylon planes latter case power used nearly flight long cooling glide-time just isnt available Thus cases about option available remove pack cooling recharging/replacement Being sport flier installations equipped air-intake scoops air exitstotally sleek Some planes fit first category described theres usually plenty glide time cooling Some ever spend power continuously rela tively short time cooling air does flow inflight limited value latter planes land hot batteries sometimes hot Continued page 135 Hot2tav Horn Old Tirner LAlks born 7J&1/1/&I i LeaZas 6 GAS PIOSEL JI/toaLL7j5 RtCORO BREK0R 1941 BROOKLYN DODGER 56 Cabin s*sSsNEWEST* Retail $5295**INTRODuCTORY PRICE* $3900 1938 Record Breake- 96 $6956 1939ZipperS4$5356 1938 Kloud King 63 $4236 1941 Brigidier 56 $4076 1941 Super Quaker 78 $3276 1940 So Long 5053036 1936 Buccaneer 04 $5996 1938 Clipper MKI 72$4156 1937 Dallaire 108 $75 16 1935 Miss Aserica 84 $7196 1941 Playboy Sr 00 $5116 1941 Playboy Jr 54$31 16 1938 Powerhouse 04 $53 56 1940 Sailplane 70 $8476 1938 Trenton Terror 73 $40 76 1940 Ranger 46$3196 1939 Korda Wake 44 $1916 1939 Mercary 72 $5836 Itits qualify SAM events FE & RIG feature highest quality machine cut & sanded parts Superior Competition sheet strip wood wire & window material Plans orig FE models esail convertible 3ch R/C KITS Sailplanes Electric power Gas Hobby Horn SENSOAR Glider 78 $1800 Midway Model GNOME RIC Hand Launch Glider$2400 Jolly Models FLINGER R/C HLG 58 Span $2400 Midway Model FAST EDDIE Acrobatic /05 Elec$1900 Jolly Models ELECTRICUS Electric Glider 0Ss$3250 Leisure PLAYBOY SR 67 Gear 05 Elect $3000 Astro ASTRO SPORT 37 Direct 05 Elect $2250 CA Addressees add 6% tax 15173 Moran St [Al Send MO VisaIMC#-eExp PO Boa 2212 Check [allow up tO 30 Westwinster Ca 92684 days CK clearance 17141 093-8311 COD Exact Charges plus $150 Hdl Cash Only [Aft Hrs 714 89512031 NEW P-30 PROP Newest design Adds up 25 sec flight pull better free wheel Introductory price 8O kit specials kit specials kit specials kit P30 Souper 30 Kit Y lb FAI rubber 1 new P30 prop List -$1825 hrough July86plus $150 UPS Fun Bird P30 Kit lb FAI rubber 1 new P30 prop List -$20252O Through July 86 pluaSi SOUPS Catalogr free orderP0 Box 3867 Torrance CA 90512 ZONA SAWS famous line hobby saws Razor #200$255 - Universal #500 $295 Saw set #100 $450 Replacement Blades available dealer ATTCHEKT ON-Board Battery Tester Saves Time. Saves Models B AiTCHEK RX-1 $1495 eln USA VV44 New Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 19141 462-6452 PO Box 1808 Poughkeepsie NY 12601 July1986 49 screw pressure would bleed away through tiny space between thread root tube used fine-thread screws inserted fulllength screw head sealed against tube end cut off exactly square 900 Another myth proved wrong pressure build up some mufflers homemade great enough push screw partly out tube pressure leaks away varying amounts variation fuel flow thereby introduced can cause sagging enginea condition can differ between flights worse screw has sometimes blown completely out tube end hot day tube soft Remedy use larger-diameter screw plug though easily inserted removed saves lot unnecessary needle valve tweeking before flight philosophy needle valve has set forget fact some most-often-flown models dont have convenient access needle valve setting changes look reason elsewhere fuel system plugged filter example Scale documentation source have drawings articles Scale modelers prod ucts Robert C Morrison past 50 years Repla-Tech International catalog lists sort information modelers seek Scale documentation new 1986 catalog No 1 aircraft includes three-view drawings acrobatic aircraft Reno racers civil military aircraft drawings Morrison Karl strom Donaldson Carter Aviation News Hirsch raceplane drawings MAP scale draw ings England complete line Koku-Fan drawings Japan Also listed Scale flying model plans Morrison MAP line plans England Part II catalog lists color documentation photos Repla-Tech collection photo packs Scale Model Research Bob Banka also long list blackand-white photos late raceplanes Golden Age raceplanes Golden Age commercial mili tary civil private aircraft special section lists color photos taken 1985 Reno races Unlimited-class racers well T-6 Texan class Formula class worth $3 catalog just know what avail able Roberts address Repla-Tech Interna tional 48500 McKenzie Hwy Vida OR 97488 Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Aerobatics/Van Putte Continued page 45 fifteenth coat primer now working way down grades jewelers rouge last several coats rubs off inside cats ear Now model sits resplendently impeccable smoother babys bottom radio installed skill comes years cold nights spent cell bately garage Pushrods straight true Servos mounted properly Battery receiver lovingly encased foam arrives flying field has flown airplanes veteran weather perfect wind just right engine starts easily gentle firm touch upon needle valve settles excellent running mixture Frequency-pin hand ribbons gaily flying antenna man steps new plane through pits toward flight line con descending envious glances behind him calm trembles neither doth quake hours labor have come fruiting consummation moment truth hand looks left looks right No landing runway clear airplane released insouciance beyond years taxis out turns about lets rest last long moment upon mother earth beautiful palpably strains fly Now rolling Faster yet faster engine fairly sings little lines around corners eyes begotten years flying models against sunny sky gently lifts runway thumbs sensuous upon sticks airborne flies flies solidly straight Now see bank gently See bank more Good heavens fool rolling thing 10 feet off deck Look roll roll roll down down thenWHAAAAP Several moments later Yeti way up Himalayas feel ground go umph under big feet still quiet wreckage retrieved studied guess what Somewhere birds will singing somewhere hearts may well light hero hooked up ailerons back wards thats fact wise man once commended notion having friend look airplane over before flies first time sober friend given late-night social rambles suffering confounded brain caused too much airplane-rubbing insides cats ears Humble pie may good moral fiber dunno about sure wont bring back smashed airplane course Ive never done anything like thanks anyway Dave Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 RC Electrics/Kopski Continued page 49 motors latter case cooling accom plished ground before recharging battery removal using small blow er positioned air intake scoop Its amaz ing very quickly some moving air can reduce pack temperature Several minutes takes Whatever way choose go battery cooling sure go noway Hot packs must cooled before safe effective charging can done battery often expensive part power system capable hundreds flights charges discharges proper carewhich cludes among other things cooling-beforecharging task heated packs informa tion some useful photographs covering general subject area can found earlier issues Model Aviation October December 1983 January September No vember 1984 February March July 1985 Basic electricity Believe still some straggler topics remaining ongoing discussion analog moving-needle multime ters Id like wrap up before con tinuing topic digital multimeters DMMsContinued page 138 DIA PITCH 634 7283 3* 4 56 833&3/44568 8*4566* 94 566* 7 7* 104 5 6 6W 6* 7 8W 106EW II 4 6 7 7* 7* 7&3/4 8 11 6EW 11* 67 12 4W 5 5W 6 13 56 14 56 15 56 16 678 FOUR-CYCLE TAILORED HELICAL PITCH 126 6* 7 7* 8 136 7 7*8 146 7 7*8 1567 16678 PYLON RACING 7SN SiN 8&3/46* 6&3/4 7 7* 7&3/4 97 7* 7&3/4 W Wide biide EW ExtFa wide PRICE $149 $179 $189 $199 $199 $209 $219 $229 $239 $239 $279 $359 $459 $659 $849 $299 $389 $489 $689 $989 $279 $289 $289 H Nalyaw SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES COMPLETE INVENTORY OF CUSTOM & STOCK PARTS OLD TIMER SUPPLIES CARBON FIBER COILS CONDENSERS SILK TRANSISTOR IGNITION SYSTEMS TIMERS ETC REPLICA OR WICK ENGINES NE WI! 1/2A PLAYBOY SR FOR 1/2A TEXACO RIC FF ELECTRIC OR SPORT KIT $2995 ORDER BY MAIL OR PHONE 714 830-5162 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRIES INVITED ALL PRICES ARE POSTPAID ON ORDERS OVER $10 ORDERS SHIPPED FIRST CLASS MAIL WITHIN 24 HRS CALIFORNIA RESIDENTS ADD 6% TAX July1986 135 OUR INVENTORY AVERAGES OVER 8000 PROPS! SPECIAL PRO SERIES RC Electrics/KopSki Continued page 135 Two terms always associated meters accuracy sensitivity Both often used varied ways both easily confused misunderstood Accuracy simply description good meas urement made given meter analog meters accuracy often ex pressed percent full scale typical number ull Scale FS means example such meter 10-volt scale accuracy scale would 100 plus minus 03 volts subtle sneaky too specification also means that same olts applies over entire scale Thus taken literally meter accuracy speci fied manner means reading ac curacy can much worse percentage readings taken lower portions given scale example nominal 30 volts applied read 10-volt scale accura cy reading would given 30 olts grand total plus/minus 10% 3% actual practice Ive never seen such miserable degradation actually occur wary anyway other ways accuracy can speci fied such simply have FS designation illustrated previously example Radio Shack 22-204 multimeter discussed earlier installments miniseries has stated accuracy simply 3% some ranges other values other ranges Such specification means given readinganywhere scaleis within three percent real true value Such much better circumstance average first example general since multimeters offer variety both functions ranges also variety accuracies listed Usually DC voltage current ranges accu rate AC ohms ranges less accurate Agaln different manufacturers spell out different ways sure check manual particulars apply instrument Later well see DMM accuracy specified what means two terms confusing sensitivity Ive seen term used several ways Ill simply illustrate few Some use sensitivity describe load voltmeter places circuit component under test Remember voltmeters re quire some small current own make needle move current comes what being measured measure some thing often change As example some voltage scales Radio Shack instrument have sensitivity 50000 ohms per volt simply describes size value multiplier resistor switched place selector knob set some particular range exam pie 10-volt range example above ternal meter resistor would 50000 ohms per volt times 10 volts 500000 ohms means instrument used range its like placing 500000 ohm resistor across whatever being measured does matter perhaps few volts being meas ured ie pointer does go full deflection ohms per volt remains con stant selected range reflect earlier lessons youll realize what really saying much current needed instrument move pointer full scale example its 10 volts divided 500000 ohms 20 microamps million times less current Elec tric motors can use meter current same full-scale deflection range having same sensitivity Obviously such tiny current would bother motor battery However electronic circuits operation would severely disrupted such measurement burden simple obvious case would occur example example instrument/range used meas ure voltage across 500000 ohm resistor particular instance new total resis tance would become 250000 ohmshalf originaland circuit measurement status would severely changed 100% reading er ror could easily result Finally case accuracy sensi tivity used varies greatly among meters among scales given instru ment check manual its important Sensitivity sometimes used describe 'how little takes make needle move' Used way term similar term resolution applied servos much input signal required make needle ser vo arm move stopped motion direction next slightly-greater position same direction Used way sensitivi ty really description pointer-bearing friction Unless instrument has suffered mechanical damage movement has come contaminated dust like need concern yourself version sensitivity Finally Ive seen two other obscure uses word doesnt matter youve made far through miniseries know youll reasonably need know about analog multimeters Thats again folks Ive used up space allotment yet another month Please direct comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 make point attend Electric meet year Take non-believer youll change life RC Pylon Racing/Hager Continued page 50 Standard class pilots aircraft get best time possible Standard class pilot will run best time Expert pilot coaching training published results will prove stock pilot skill deter mines winner Compare above other Pylon events have over $200 engine aircraft engine aircraft cost less $100 speeds over two minutes against little over minute means midairs have several aircraft just keep fly ing found club built some 20 Formula 500sbut two flying condition first race Formula 500 trainer third-year Championships held September 1985 Corvallis OR Seventeen pilots Expert Standard Class qualified Championships set aside 138 Model Aviation DCO SKY DfI[ 65 Ignition Approed 90 Day Warmitv Twin Ball Bearing Crank Americas finest old-timer engine Originally designed Hassad & Havlik replica engine resonic tuning ensures continuous flow power through speed range Look out green goodbye red headT&Ds replica Sky Devil 65 $279 less coil cond & plug Calit residents add 6% sales ta ORDR DIRCT T&D RESEARCH Associis 6371 El Cajon Blvd Suite 115 San Diego CA 92115 SI FOR BROCHURE MASTER AIRSCREW ~RAhfW 12x8 Folder1195 15x12 Folder ..1295 05 Direct Drive Prop Adapter395 Available thru Dealer WINDSOR PROPELLER CO 384 Tesoonl Ct Santa Rosa CA 95401 RON CHIDGEYS TIGER TAIL 4 800 sq Basic Kit $119 FihuI. Faa. F., C. ft Fly CAJUN RIG PRODUCTS 112 6081 Lot nynie LA 7inii 318 2327446 z
Edition: Model Aviation - 1986/07
Page Numbers: 48, 49, 135, 138
Radio Control E lectrics Bob Kopski UPCOMING Electric meets Id like remind readers its policy pleasure spread good word about planned activities columnbut must know about adequately advance Hint Hint June 21 22 tentative Daniel Boone Silent Flyers 7th Annual Two-Meter/Electric RC Contest Electric event will use one-charge duration proposal presented June column information please contact Jerry Zeigenfuse 8 Craig Dr Read ing PA 19606 phone 215 779-3229 June 28 29 Boeing Hawks 4th Annual Elec tric Fly-In Seattle meet forms electric-powered model aircraft prizes will given Best Entry Event Most Acrobatic Longest Flight Surprise Events Mitch Poling Model Builders Elec tric columnist will host Electric Clinic information please contact Bernard Cawley 210 37th SE #43 Auburn WA 98002 telephone 206 939-1778 can also contact Dave Katagiri 206 248-1024 July 13 Polk County Soaring Eagles Lakeland FL announce First Annual Elec tric Fly Plaques will awarded fourth place two Soaring events information please contact Leonard Postage 6103 Andrea Dr LakeLand FL 33803 telephone 813/6441942 home 813/293-3434 work July 20 South Shore RC Club based Bridgewater MA presents Second Annual Electric Fly organized fun-fly no classes other limitations Electrics welcome will prizes Best Model Most Aerobatic Longest Flight One-Charge Duration event latter following format suggested June column info please con tact Charles Sylvia PO Box 775 Middle boro MA 02346 telephone 617 947-2805 July 27 SAM 76 Old-Timers Annual Meet Hatfield PA Electric event will open model aircraft complying applicable SAM OT model requirements nickelcadmium Electric power system may used information please contact Dave Ritchie 2908 Truman Drive Hatfield PA 19440 telephone 215 362-2933 August 16 17 Electric Model Flyers Chicago host First Annual Electric Fly-In planning carbon copy KRC Vice-President Les Adams regular KRC affair tells Electrics wel come some planned events include Most Aerobatic Best-Looking Long est Flight Best Design maybe All-Up Last-Down can get info Larry Sperling 2517 Brush Road #102 Schuamberg IL 60195-3910 September 20 21 Seventh Annual KRC Electric Fly Hatfield PA years meet continues famous low-key all-Electrics are-welcome tradition also includes some scheduled events like Longest Flight Up Last-Down Most Loops per minute Aerobatic Scale years meet breaks tradition first time allows KRC members actively compete activities information contact Ken Stinson 140 Hopewell Lane Telford PA 18969 telephone 215 721-0248 Battery cooling facts Electric life some readers interested formation matter Batteries can get hot two ways during improper charging during discharging charging properly done very little associated heating Generally heat produced during dis charge flying tries charge already-hot battery ofttimes heat easily generatedusually much charging battery normal temperature Thus during course Electric flying some form battery-cooling advised absolutely necessary Modelers have developed several ways deal matter opin ions preferences vary Lets look some particulars can select what seems best use Battery installations fall roughly two Economy vinyl cassette carrying cases can stripped labeling flimsy organizer tray allow stuff meterand test ieads tools whatever L Test and/or charging leads can kept untangied using slip-on tubes R Tubes shown inciude sections malihig tube MonoKote roll rocket tube Bob ilkes plastic 35mm fiim containers bottoms cut out 48 Model Aviation Look both ends dryer see innards iooksomething Ike cant see right away disassemble unit remember Bobs motto What man can assembie man can disassemblel Save ex cess partsmost can useful sometime Whats cheapie hair-dryer got flying Electrics can gut blowerto help cool battery pack fore charging dryer typical type look Get cheapest Finally treasure neat little Mabuchi similar DC motor high-perform ance blower assembly Bob has tried severn different dryers has found motors run well 12 volts DC dryer mo tor power obtained tap heater element diode rectifier does great job cooling battery packs categories 1 battery easily removed model 2 battery kinds built difficult get out first kind offers advantages easy interchangeability packs pack can cool another being charged yet another being flown some such Geneo ally model structured may tend weaker side given some hatch other interruption fuselage structure used access pack Nevertheless popular workable approach Ive seen modelers favor other hand installations have sorta-built-in batteriesits easy get em out Also prefer have planes spare packs Thus 1 must use some scheme other removing hot pack al lowing cool before recharging flying In-plane battery-cooling can effected either cases done arranging in-flight airflow around through pack usefulness effectiveness such approach varies both model type quality installation/airflow design Some examples may help under stand better Consider duration plane can glider Old-Timer sport modelany plane flies significant portion total flight power always encourage flowthrough air cooling kind model because makes sense mind use gliding time model motion permit cool ing air reduce battery temperatures tained during power-on portion flight Often depending glide time no additional cooling needed after landing recharging can begin immediately course some serious enthusiasts may want blemish otherwise sleek lines clean Soaring machine air scoops air outlets same kind thinking often ap plies sleek Aerobatic Pylon planes latter case power used nearly flight long cooling glide-time just isnt available Thus cases about option available remove pack cooling recharging/replacement Being sport flier installations equipped air-intake scoops air exitstotally sleek Some planes fit first category described theres usually plenty glide time cooling Some ever spend power continuously rela tively short time cooling air does flow inflight limited value latter planes land hot batteries sometimes hot Continued page 135 Hot2tav Horn Old Tirner LAlks born 7J&1/1/&I i LeaZas 6 GAS PIOSEL JI/toaLL7j5 RtCORO BREK0R 1941 BROOKLYN DODGER 56 Cabin s*sSsNEWEST* Retail $5295**INTRODuCTORY PRICE* $3900 1938 Record Breake- 96 $6956 1939ZipperS4$5356 1938 Kloud King 63 $4236 1941 Brigidier 56 $4076 1941 Super Quaker 78 $3276 1940 So Long 5053036 1936 Buccaneer 04 $5996 1938 Clipper MKI 72$4156 1937 Dallaire 108 $75 16 1935 Miss Aserica 84 $7196 1941 Playboy Sr 00 $5116 1941 Playboy Jr 54$31 16 1938 Powerhouse 04 $53 56 1940 Sailplane 70 $8476 1938 Trenton Terror 73 $40 76 1940 Ranger 46$3196 1939 Korda Wake 44 $1916 1939 Mercary 72 $5836 Itits qualify SAM events FE & RIG feature highest quality machine cut & sanded parts Superior Competition sheet strip wood wire & window material Plans orig FE models esail convertible 3ch R/C KITS Sailplanes Electric power Gas Hobby Horn SENSOAR Glider 78 $1800 Midway Model GNOME RIC Hand Launch Glider$2400 Jolly Models FLINGER R/C HLG 58 Span $2400 Midway Model FAST EDDIE Acrobatic /05 Elec$1900 Jolly Models ELECTRICUS Electric Glider 0Ss$3250 Leisure PLAYBOY SR 67 Gear 05 Elect $3000 Astro ASTRO SPORT 37 Direct 05 Elect $2250 CA Addressees add 6% tax 15173 Moran St [Al Send MO VisaIMC#-eExp PO Boa 2212 Check [allow up tO 30 Westwinster Ca 92684 days CK clearance 17141 093-8311 COD Exact Charges plus $150 Hdl Cash Only [Aft Hrs 714 89512031 NEW P-30 PROP Newest design Adds up 25 sec flight pull better free wheel Introductory price 8O kit specials kit specials kit specials kit P30 Souper 30 Kit Y lb FAI rubber 1 new P30 prop List -$1825 hrough July86plus $150 UPS Fun Bird P30 Kit lb FAI rubber 1 new P30 prop List -$20252O Through July 86 pluaSi SOUPS Catalogr free orderP0 Box 3867 Torrance CA 90512 ZONA SAWS famous line hobby saws Razor #200$255 - Universal #500 $295 Saw set #100 $450 Replacement Blades available dealer ATTCHEKT ON-Board Battery Tester Saves Time. Saves Models B AiTCHEK RX-1 $1495 eln USA VV44 New Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 19141 462-6452 PO Box 1808 Poughkeepsie NY 12601 July1986 49 screw pressure would bleed away through tiny space between thread root tube used fine-thread screws inserted fulllength screw head sealed against tube end cut off exactly square 900 Another myth proved wrong pressure build up some mufflers homemade great enough push screw partly out tube pressure leaks away varying amounts variation fuel flow thereby introduced can cause sagging enginea condition can differ between flights worse screw has sometimes blown completely out tube end hot day tube soft Remedy use larger-diameter screw plug though easily inserted removed saves lot unnecessary needle valve tweeking before flight philosophy needle valve has set forget fact some most-often-flown models dont have convenient access needle valve setting changes look reason elsewhere fuel system plugged filter example Scale documentation source have drawings articles Scale modelers prod ucts Robert C Morrison past 50 years Repla-Tech International catalog lists sort information modelers seek Scale documentation new 1986 catalog No 1 aircraft includes three-view drawings acrobatic aircraft Reno racers civil military aircraft drawings Morrison Karl strom Donaldson Carter Aviation News Hirsch raceplane drawings MAP scale draw ings England complete line Koku-Fan drawings Japan Also listed Scale flying model plans Morrison MAP line plans England Part II catalog lists color documentation photos Repla-Tech collection photo packs Scale Model Research Bob Banka also long list blackand-white photos late raceplanes Golden Age raceplanes Golden Age commercial mili tary civil private aircraft special section lists color photos taken 1985 Reno races Unlimited-class racers well T-6 Texan class Formula class worth $3 catalog just know what avail able Roberts address Repla-Tech Interna tional 48500 McKenzie Hwy Vida OR 97488 Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Aerobatics/Van Putte Continued page 45 fifteenth coat primer now working way down grades jewelers rouge last several coats rubs off inside cats ear Now model sits resplendently impeccable smoother babys bottom radio installed skill comes years cold nights spent cell bately garage Pushrods straight true Servos mounted properly Battery receiver lovingly encased foam arrives flying field has flown airplanes veteran weather perfect wind just right engine starts easily gentle firm touch upon needle valve settles excellent running mixture Frequency-pin hand ribbons gaily flying antenna man steps new plane through pits toward flight line con descending envious glances behind him calm trembles neither doth quake hours labor have come fruiting consummation moment truth hand looks left looks right No landing runway clear airplane released insouciance beyond years taxis out turns about lets rest last long moment upon mother earth beautiful palpably strains fly Now rolling Faster yet faster engine fairly sings little lines around corners eyes begotten years flying models against sunny sky gently lifts runway thumbs sensuous upon sticks airborne flies flies solidly straight Now see bank gently See bank more Good heavens fool rolling thing 10 feet off deck Look roll roll roll down down thenWHAAAAP Several moments later Yeti way up Himalayas feel ground go umph under big feet still quiet wreckage retrieved studied guess what Somewhere birds will singing somewhere hearts may well light hero hooked up ailerons back wards thats fact wise man once commended notion having friend look airplane over before flies first time sober friend given late-night social rambles suffering confounded brain caused too much airplane-rubbing insides cats ears Humble pie may good moral fiber dunno about sure wont bring back smashed airplane course Ive never done anything like thanks anyway Dave Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 RC Electrics/Kopski Continued page 49 motors latter case cooling accom plished ground before recharging battery removal using small blow er positioned air intake scoop Its amaz ing very quickly some moving air can reduce pack temperature Several minutes takes Whatever way choose go battery cooling sure go noway Hot packs must cooled before safe effective charging can done battery often expensive part power system capable hundreds flights charges discharges proper carewhich cludes among other things cooling-beforecharging task heated packs informa tion some useful photographs covering general subject area can found earlier issues Model Aviation October December 1983 January September No vember 1984 February March July 1985 Basic electricity Believe still some straggler topics remaining ongoing discussion analog moving-needle multime ters Id like wrap up before con tinuing topic digital multimeters DMMsContinued page 138 DIA PITCH 634 7283 3* 4 56 833&3/44568 8*4566* 94 566* 7 7* 104 5 6 6W 6* 7 8W 106EW II 4 6 7 7* 7* 7&3/4 8 11 6EW 11* 67 12 4W 5 5W 6 13 56 14 56 15 56 16 678 FOUR-CYCLE TAILORED HELICAL PITCH 126 6* 7 7* 8 136 7 7*8 146 7 7*8 1567 16678 PYLON RACING 7SN SiN 8&3/46* 6&3/4 7 7* 7&3/4 97 7* 7&3/4 W Wide biide EW ExtFa wide PRICE $149 $179 $189 $199 $199 $209 $219 $229 $239 $239 $279 $359 $459 $659 $849 $299 $389 $489 $689 $989 $279 $289 $289 H Nalyaw SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES COMPLETE INVENTORY OF CUSTOM & STOCK PARTS OLD TIMER SUPPLIES CARBON FIBER COILS CONDENSERS SILK TRANSISTOR IGNITION SYSTEMS TIMERS ETC REPLICA OR WICK ENGINES NE WI! 1/2A PLAYBOY SR FOR 1/2A TEXACO RIC FF ELECTRIC OR SPORT KIT $2995 ORDER BY MAIL OR PHONE 714 830-5162 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRIES INVITED ALL PRICES ARE POSTPAID ON ORDERS OVER $10 ORDERS SHIPPED FIRST CLASS MAIL WITHIN 24 HRS CALIFORNIA RESIDENTS ADD 6% TAX July1986 135 OUR INVENTORY AVERAGES OVER 8000 PROPS! SPECIAL PRO SERIES RC Electrics/KopSki Continued page 135 Two terms always associated meters accuracy sensitivity Both often used varied ways both easily confused misunderstood Accuracy simply description good meas urement made given meter analog meters accuracy often ex pressed percent full scale typical number ull Scale FS means example such meter 10-volt scale accuracy scale would 100 plus minus 03 volts subtle sneaky too specification also means that same olts applies over entire scale Thus taken literally meter accuracy speci fied manner means reading ac curacy can much worse percentage readings taken lower portions given scale example nominal 30 volts applied read 10-volt scale accura cy reading would given 30 olts grand total plus/minus 10% 3% actual practice Ive never seen such miserable degradation actually occur wary anyway other ways accuracy can speci fied such simply have FS designation illustrated previously example Radio Shack 22-204 multimeter discussed earlier installments miniseries has stated accuracy simply 3% some ranges other values other ranges Such specification means given readinganywhere scaleis within three percent real true value Such much better circumstance average first example general since multimeters offer variety both functions ranges also variety accuracies listed Usually DC voltage current ranges accu rate AC ohms ranges less accurate Agaln different manufacturers spell out different ways sure check manual particulars apply instrument Later well see DMM accuracy specified what means two terms confusing sensitivity Ive seen term used several ways Ill simply illustrate few Some use sensitivity describe load voltmeter places circuit component under test Remember voltmeters re quire some small current own make needle move current comes what being measured measure some thing often change As example some voltage scales Radio Shack instrument have sensitivity 50000 ohms per volt simply describes size value multiplier resistor switched place selector knob set some particular range exam pie 10-volt range example above ternal meter resistor would 50000 ohms per volt times 10 volts 500000 ohms means instrument used range its like placing 500000 ohm resistor across whatever being measured does matter perhaps few volts being meas ured ie pointer does go full deflection ohms per volt remains con stant selected range reflect earlier lessons youll realize what really saying much current needed instrument move pointer full scale example its 10 volts divided 500000 ohms 20 microamps million times less current Elec tric motors can use meter current same full-scale deflection range having same sensitivity Obviously such tiny current would bother motor battery However electronic circuits operation would severely disrupted such measurement burden simple obvious case would occur example example instrument/range used meas ure voltage across 500000 ohm resistor particular instance new total resis tance would become 250000 ohmshalf originaland circuit measurement status would severely changed 100% reading er ror could easily result Finally case accuracy sensi tivity used varies greatly among meters among scales given instru ment check manual its important Sensitivity sometimes used describe 'how little takes make needle move' Used way term similar term resolution applied servos much input signal required make needle ser vo arm move stopped motion direction next slightly-greater position same direction Used way sensitivi ty really description pointer-bearing friction Unless instrument has suffered mechanical damage movement has come contaminated dust like need concern yourself version sensitivity Finally Ive seen two other obscure uses word doesnt matter youve made far through miniseries know youll reasonably need know about analog multimeters Thats again folks Ive used up space allotment yet another month Please direct comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 make point attend Electric meet year Take non-believer youll change life RC Pylon Racing/Hager Continued page 50 Standard class pilots aircraft get best time possible Standard class pilot will run best time Expert pilot coaching training published results will prove stock pilot skill deter mines winner Compare above other Pylon events have over $200 engine aircraft engine aircraft cost less $100 speeds over two minutes against little over minute means midairs have several aircraft just keep fly ing found club built some 20 Formula 500sbut two flying condition first race Formula 500 trainer third-year Championships held September 1985 Corvallis OR Seventeen pilots Expert Standard Class qualified Championships set aside 138 Model Aviation DCO SKY DfI[ 65 Ignition Approed 90 Day Warmitv Twin Ball Bearing Crank Americas finest old-timer engine Originally designed Hassad & Havlik replica engine resonic tuning ensures continuous flow power through speed range Look out green goodbye red headT&Ds replica Sky Devil 65 $279 less coil cond & plug Calit residents add 6% sales ta ORDR DIRCT T&D RESEARCH Associis 6371 El Cajon Blvd Suite 115 San Diego CA 92115 SI FOR BROCHURE MASTER AIRSCREW ~RAhfW 12x8 Folder1195 15x12 Folder ..1295 05 Direct Drive Prop Adapter395 Available thru Dealer WINDSOR PROPELLER CO 384 Tesoonl Ct Santa Rosa CA 95401 RON CHIDGEYS TIGER TAIL 4 800 sq Basic Kit $119 FihuI. Faa. F., C. ft Fly CAJUN RIG PRODUCTS 112 6081 Lot nynie LA 7inii 318 2327446 z
Edition: Model Aviation - 1986/07
Page Numbers: 48, 49, 135, 138
Radio Control E lectrics Bob Kopski UPCOMING Electric meets Id like remind readers its policy pleasure spread good word about planned activities columnbut must know about adequately advance Hint Hint June 21 22 tentative Daniel Boone Silent Flyers 7th Annual Two-Meter/Electric RC Contest Electric event will use one-charge duration proposal presented June column information please contact Jerry Zeigenfuse 8 Craig Dr Read ing PA 19606 phone 215 779-3229 June 28 29 Boeing Hawks 4th Annual Elec tric Fly-In Seattle meet forms electric-powered model aircraft prizes will given Best Entry Event Most Acrobatic Longest Flight Surprise Events Mitch Poling Model Builders Elec tric columnist will host Electric Clinic information please contact Bernard Cawley 210 37th SE #43 Auburn WA 98002 telephone 206 939-1778 can also contact Dave Katagiri 206 248-1024 July 13 Polk County Soaring Eagles Lakeland FL announce First Annual Elec tric Fly Plaques will awarded fourth place two Soaring events information please contact Leonard Postage 6103 Andrea Dr LakeLand FL 33803 telephone 813/6441942 home 813/293-3434 work July 20 South Shore RC Club based Bridgewater MA presents Second Annual Electric Fly organized fun-fly no classes other limitations Electrics welcome will prizes Best Model Most Aerobatic Longest Flight One-Charge Duration event latter following format suggested June column info please con tact Charles Sylvia PO Box 775 Middle boro MA 02346 telephone 617 947-2805 July 27 SAM 76 Old-Timers Annual Meet Hatfield PA Electric event will open model aircraft complying applicable SAM OT model requirements nickelcadmium Electric power system may used information please contact Dave Ritchie 2908 Truman Drive Hatfield PA 19440 telephone 215 362-2933 August 16 17 Electric Model Flyers Chicago host First Annual Electric Fly-In planning carbon copy KRC Vice-President Les Adams regular KRC affair tells Electrics wel come some planned events include Most Aerobatic Best-Looking Long est Flight Best Design maybe All-Up Last-Down can get info Larry Sperling 2517 Brush Road #102 Schuamberg IL 60195-3910 September 20 21 Seventh Annual KRC Electric Fly Hatfield PA years meet continues famous low-key all-Electrics are-welcome tradition also includes some scheduled events like Longest Flight Up Last-Down Most Loops per minute Aerobatic Scale years meet breaks tradition first time allows KRC members actively compete activities information contact Ken Stinson 140 Hopewell Lane Telford PA 18969 telephone 215 721-0248 Battery cooling facts Electric life some readers interested formation matter Batteries can get hot two ways during improper charging during discharging charging properly done very little associated heating Generally heat produced during dis charge flying tries charge already-hot battery ofttimes heat easily generatedusually much charging battery normal temperature Thus during course Electric flying some form battery-cooling advised absolutely necessary Modelers have developed several ways deal matter opin ions preferences vary Lets look some particulars can select what seems best use Battery installations fall roughly two Economy vinyl cassette carrying cases can stripped labeling flimsy organizer tray allow stuff meterand test ieads tools whatever L Test and/or charging leads can kept untangied using slip-on tubes R Tubes shown inciude sections malihig tube MonoKote roll rocket tube Bob ilkes plastic 35mm fiim containers bottoms cut out 48 Model Aviation Look both ends dryer see innards iooksomething Ike cant see right away disassemble unit remember Bobs motto What man can assembie man can disassemblel Save ex cess partsmost can useful sometime Whats cheapie hair-dryer got flying Electrics can gut blowerto help cool battery pack fore charging dryer typical type look Get cheapest Finally treasure neat little Mabuchi similar DC motor high-perform ance blower assembly Bob has tried severn different dryers has found motors run well 12 volts DC dryer mo tor power obtained tap heater element diode rectifier does great job cooling battery packs categories 1 battery easily removed model 2 battery kinds built difficult get out first kind offers advantages easy interchangeability packs pack can cool another being charged yet another being flown some such Geneo ally model structured may tend weaker side given some hatch other interruption fuselage structure used access pack Nevertheless popular workable approach Ive seen modelers favor other hand installations have sorta-built-in batteriesits easy get em out Also prefer have planes spare packs Thus 1 must use some scheme other removing hot pack al lowing cool before recharging flying In-plane battery-cooling can effected either cases done arranging in-flight airflow around through pack usefulness effectiveness such approach varies both model type quality installation/airflow design Some examples may help under stand better Consider duration plane can glider Old-Timer sport modelany plane flies significant portion total flight power always encourage flowthrough air cooling kind model because makes sense mind use gliding time model motion permit cool ing air reduce battery temperatures tained during power-on portion flight Often depending glide time no additional cooling needed after landing recharging can begin immediately course some serious enthusiasts may want blemish otherwise sleek lines clean Soaring machine air scoops air outlets same kind thinking often ap plies sleek Aerobatic Pylon planes latter case power used nearly flight long cooling glide-time just isnt available Thus cases about option available remove pack cooling recharging/replacement Being sport flier installations equipped air-intake scoops air exitstotally sleek Some planes fit first category described theres usually plenty glide time cooling Some ever spend power continuously rela tively short time cooling air does flow inflight limited value latter planes land hot batteries sometimes hot Continued page 135 Hot2tav Horn Old Tirner LAlks born 7J&1/1/&I i LeaZas 6 GAS PIOSEL JI/toaLL7j5 RtCORO BREK0R 1941 BROOKLYN DODGER 56 Cabin s*sSsNEWEST* Retail $5295**INTRODuCTORY PRICE* $3900 1938 Record Breake- 96 $6956 1939ZipperS4$5356 1938 Kloud King 63 $4236 1941 Brigidier 56 $4076 1941 Super Quaker 78 $3276 1940 So Long 5053036 1936 Buccaneer 04 $5996 1938 Clipper MKI 72$4156 1937 Dallaire 108 $75 16 1935 Miss Aserica 84 $7196 1941 Playboy Sr 00 $5116 1941 Playboy Jr 54$31 16 1938 Powerhouse 04 $53 56 1940 Sailplane 70 $8476 1938 Trenton Terror 73 $40 76 1940 Ranger 46$3196 1939 Korda Wake 44 $1916 1939 Mercary 72 $5836 Itits qualify SAM events FE & RIG feature highest quality machine cut & sanded parts Superior Competition sheet strip wood wire & window material Plans orig FE models esail convertible 3ch R/C KITS Sailplanes Electric power Gas Hobby Horn SENSOAR Glider 78 $1800 Midway Model GNOME RIC Hand Launch Glider$2400 Jolly Models FLINGER R/C HLG 58 Span $2400 Midway Model FAST EDDIE Acrobatic /05 Elec$1900 Jolly Models ELECTRICUS Electric Glider 0Ss$3250 Leisure PLAYBOY SR 67 Gear 05 Elect $3000 Astro ASTRO SPORT 37 Direct 05 Elect $2250 CA Addressees add 6% tax 15173 Moran St [Al Send MO VisaIMC#-eExp PO Boa 2212 Check [allow up tO 30 Westwinster Ca 92684 days CK clearance 17141 093-8311 COD Exact Charges plus $150 Hdl Cash Only [Aft Hrs 714 89512031 NEW P-30 PROP Newest design Adds up 25 sec flight pull better free wheel Introductory price 8O kit specials kit specials kit specials kit P30 Souper 30 Kit Y lb FAI rubber 1 new P30 prop List -$1825 hrough July86plus $150 UPS Fun Bird P30 Kit lb FAI rubber 1 new P30 prop List -$20252O Through July 86 pluaSi SOUPS Catalogr free orderP0 Box 3867 Torrance CA 90512 ZONA SAWS famous line hobby saws Razor #200$255 - Universal #500 $295 Saw set #100 $450 Replacement Blades available dealer ATTCHEKT ON-Board Battery Tester Saves Time. Saves Models B AiTCHEK RX-1 $1495 eln USA VV44 New Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 19141 462-6452 PO Box 1808 Poughkeepsie NY 12601 July1986 49 screw pressure would bleed away through tiny space between thread root tube used fine-thread screws inserted fulllength screw head sealed against tube end cut off exactly square 900 Another myth proved wrong pressure build up some mufflers homemade great enough push screw partly out tube pressure leaks away varying amounts variation fuel flow thereby introduced can cause sagging enginea condition can differ between flights worse screw has sometimes blown completely out tube end hot day tube soft Remedy use larger-diameter screw plug though easily inserted removed saves lot unnecessary needle valve tweeking before flight philosophy needle valve has set forget fact some most-often-flown models dont have convenient access needle valve setting changes look reason elsewhere fuel system plugged filter example Scale documentation source have drawings articles Scale modelers prod ucts Robert C Morrison past 50 years Repla-Tech International catalog lists sort information modelers seek Scale documentation new 1986 catalog No 1 aircraft includes three-view drawings acrobatic aircraft Reno racers civil military aircraft drawings Morrison Karl strom Donaldson Carter Aviation News Hirsch raceplane drawings MAP scale draw ings England complete line Koku-Fan drawings Japan Also listed Scale flying model plans Morrison MAP line plans England Part II catalog lists color documentation photos Repla-Tech collection photo packs Scale Model Research Bob Banka also long list blackand-white photos late raceplanes Golden Age raceplanes Golden Age commercial mili tary civil private aircraft special section lists color photos taken 1985 Reno races Unlimited-class racers well T-6 Texan class Formula class worth $3 catalog just know what avail able Roberts address Repla-Tech Interna tional 48500 McKenzie Hwy Vida OR 97488 Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Aerobatics/Van Putte Continued page 45 fifteenth coat primer now working way down grades jewelers rouge last several coats rubs off inside cats ear Now model sits resplendently impeccable smoother babys bottom radio installed skill comes years cold nights spent cell bately garage Pushrods straight true Servos mounted properly Battery receiver lovingly encased foam arrives flying field has flown airplanes veteran weather perfect wind just right engine starts easily gentle firm touch upon needle valve settles excellent running mixture Frequency-pin hand ribbons gaily flying antenna man steps new plane through pits toward flight line con descending envious glances behind him calm trembles neither doth quake hours labor have come fruiting consummation moment truth hand looks left looks right No landing runway clear airplane released insouciance beyond years taxis out turns about lets rest last long moment upon mother earth beautiful palpably strains fly Now rolling Faster yet faster engine fairly sings little lines around corners eyes begotten years flying models against sunny sky gently lifts runway thumbs sensuous upon sticks airborne flies flies solidly straight Now see bank gently See bank more Good heavens fool rolling thing 10 feet off deck Look roll roll roll down down thenWHAAAAP Several moments later Yeti way up Himalayas feel ground go umph under big feet still quiet wreckage retrieved studied guess what Somewhere birds will singing somewhere hearts may well light hero hooked up ailerons back wards thats fact wise man once commended notion having friend look airplane over before flies first time sober friend given late-night social rambles suffering confounded brain caused too much airplane-rubbing insides cats ears Humble pie may good moral fiber dunno about sure wont bring back smashed airplane course Ive never done anything like thanks anyway Dave Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 RC Electrics/Kopski Continued page 49 motors latter case cooling accom plished ground before recharging battery removal using small blow er positioned air intake scoop Its amaz ing very quickly some moving air can reduce pack temperature Several minutes takes Whatever way choose go battery cooling sure go noway Hot packs must cooled before safe effective charging can done battery often expensive part power system capable hundreds flights charges discharges proper carewhich cludes among other things cooling-beforecharging task heated packs informa tion some useful photographs covering general subject area can found earlier issues Model Aviation October December 1983 January September No vember 1984 February March July 1985 Basic electricity Believe still some straggler topics remaining ongoing discussion analog moving-needle multime ters Id like wrap up before con tinuing topic digital multimeters DMMsContinued page 138 DIA PITCH 634 7283 3* 4 56 833&3/44568 8*4566* 94 566* 7 7* 104 5 6 6W 6* 7 8W 106EW II 4 6 7 7* 7* 7&3/4 8 11 6EW 11* 67 12 4W 5 5W 6 13 56 14 56 15 56 16 678 FOUR-CYCLE TAILORED HELICAL PITCH 126 6* 7 7* 8 136 7 7*8 146 7 7*8 1567 16678 PYLON RACING 7SN SiN 8&3/46* 6&3/4 7 7* 7&3/4 97 7* 7&3/4 W Wide biide EW ExtFa wide PRICE $149 $179 $189 $199 $199 $209 $219 $229 $239 $239 $279 $359 $459 $659 $849 $299 $389 $489 $689 $989 $279 $289 $289 H Nalyaw SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES COMPLETE INVENTORY OF CUSTOM & STOCK PARTS OLD TIMER SUPPLIES CARBON FIBER COILS CONDENSERS SILK TRANSISTOR IGNITION SYSTEMS TIMERS ETC REPLICA OR WICK ENGINES NE WI! 1/2A PLAYBOY SR FOR 1/2A TEXACO RIC FF ELECTRIC OR SPORT KIT $2995 ORDER BY MAIL OR PHONE 714 830-5162 SORRY NO COD VISA & MASTERCARD WELCOME DEALER INQUIRIES INVITED ALL PRICES ARE POSTPAID ON ORDERS OVER $10 ORDERS SHIPPED FIRST CLASS MAIL WITHIN 24 HRS CALIFORNIA RESIDENTS ADD 6% TAX July1986 135 OUR INVENTORY AVERAGES OVER 8000 PROPS! SPECIAL PRO SERIES RC Electrics/KopSki Continued page 135 Two terms always associated meters accuracy sensitivity Both often used varied ways both easily confused misunderstood Accuracy simply description good meas urement made given meter analog meters accuracy often ex pressed percent full scale typical number ull Scale FS means example such meter 10-volt scale accuracy scale would 100 plus minus 03 volts subtle sneaky too specification also means that same olts applies over entire scale Thus taken literally meter accuracy speci fied manner means reading ac curacy can much worse percentage readings taken lower portions given scale example nominal 30 volts applied read 10-volt scale accura cy reading would given 30 olts grand total plus/minus 10% 3% actual practice Ive never seen such miserable degradation actually occur wary anyway other ways accuracy can speci fied such simply have FS designation illustrated previously example Radio Shack 22-204 multimeter discussed earlier installments miniseries has stated accuracy simply 3% some ranges other values other ranges Such specification means given readinganywhere scaleis within three percent real true value Such much better circumstance average first example general since multimeters offer variety both functions ranges also variety accuracies listed Usually DC voltage current ranges accu rate AC ohms ranges less accurate Agaln different manufacturers spell out different ways sure check manual particulars apply instrument Later well see DMM accuracy specified what means two terms confusing sensitivity Ive seen term used several ways Ill simply illustrate few Some use sensitivity describe load voltmeter places circuit component under test Remember voltmeters re quire some small current own make needle move current comes what being measured measure some thing often change As example some voltage scales Radio Shack instrument have sensitivity 50000 ohms per volt simply describes size value multiplier resistor switched place selector knob set some particular range exam pie 10-volt range example above ternal meter resistor would 50000 ohms per volt times 10 volts 500000 ohms means instrument used range its like placing 500000 ohm resistor across whatever being measured does matter perhaps few volts being meas ured ie pointer does go full deflection ohms per volt remains con stant selected range reflect earlier lessons youll realize what really saying much current needed instrument move pointer full scale example its 10 volts divided 500000 ohms 20 microamps million times less current Elec tric motors can use meter current same full-scale deflection range having same sensitivity Obviously such tiny current would bother motor battery However electronic circuits operation would severely disrupted such measurement burden simple obvious case would occur example example instrument/range used meas ure voltage across 500000 ohm resistor particular instance new total resis tance would become 250000 ohmshalf originaland circuit measurement status would severely changed 100% reading er ror could easily result Finally case accuracy sensi tivity used varies greatly among meters among scales given instru ment check manual its important Sensitivity sometimes used describe 'how little takes make needle move' Used way term similar term resolution applied servos much input signal required make needle ser vo arm move stopped motion direction next slightly-greater position same direction Used way sensitivi ty really description pointer-bearing friction Unless instrument has suffered mechanical damage movement has come contaminated dust like need concern yourself version sensitivity Finally Ive seen two other obscure uses word doesnt matter youve made far through miniseries know youll reasonably need know about analog multimeters Thats again folks Ive used up space allotment yet another month Please direct comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 make point 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