Radio Control Scale Bob Dolly Wischer FACT OR FICTION fictional theories about model flying importance scale effect bugaboo past supposedly kept model flying man ner somewhat similar its prototype have asked whether scale effect makes changes necessary airfoils tail surface areas answer present-day RC Scale models dont need changes no doubt scale effect factor very small light slow-flying models such Peanut Scale rubber-powered Schoolyard Scale RC types However size models now flying 40 60 120 engines effect isnt evident really accentuated experience compare flight mod els exact full-size counterparts find remarkable similarities Giant Scale models like prototypes distant past Scale models provided enlarged tail surfaces because ex pected instability problems None exist ing Scale models have non-scale control surface areas World War aircraft models may have root some horror stories about need increased area Morane-Saul nier Parasol Monoplane miniscule eleva tor no stabilizer gave type evil reputation being tricky sensitive flight Hazards flight probably equal enemy gunfire contrast Sopwith Strutter stabilizer/elevator com bination enormous area making threepoint landing difficult Models flown fast aerobatically susceptible control surface flutter rarely occurs slower speeds Pure fic tion Slow-flying models extremely light structure can also develop flutter problem light structures will endure stress imposed tight covering material cover permitted sag least isnt shrunken tightly wing type built-in flexibility can develop flutter slow speed have heard example complete wing flutteredand model wasnt equipped ailerons sufficient twist structure due softness surface covering material permit oscillations begin Once initiated flutter amplitude increased wing destroyed itself What started shallow dive wind gust engine vibration un balanced prop passing through rpm region causing resonance Tightly-stretched covering material stiffens light structure resist twist Returning earlier statement its usual ly speed brings destructive flutter can result number causes such flexible pushrods torque rods soft broken hinges free play control system soft flexible material control sur face itself An often-overlooked source flex ibility can lead flutter plastic hinges supported point immediately adjacent hinge pin have guilty promoting weakness cutting away wedge balsa barrel portion hinge inset wing aileron nogap fit between surfaces Cut bit too deeply no support near hinge pin can result transverse motion across hinge age condition worsens finally hear ominous whir flutter bottom loop whenever speed creases model can slowed instantly may survive flutter occurs 50-50 chance will serious damage open clevis end pushrod broken teeth servo gears fractured control horn af fected surface sudden departure control surface loud buzz fluttering surface can heard above engine prop noise sound flag strong wind similar flag control surface have common reason fluttering fast-flowing air Stiffen soft control system during model construction using several plywood fairleads wire pushrods through wing Holes plywood A-in music wire should about %2-in diameter bend rod represents point easy deflection pro motes softness system like manner should no bends wire ends wood-dowel elevator rudder pushrod Dick Speldel L used Nick ZIroil fiberglass fusciage constructing AT-S Wing baisa-over-foam covered giass cioth Power 4-cu-ln Hornet DIck made own shock-absorbing retracts Boston worm gears support 29-ib weight Aiuminum split fiaps operated torque tubes Finish Hobbypoxy epoxy paint Jim Messers 1/4-scale Bristol Scout R wing faiiure flutter gusty wind conditions K-W Raiiy Quadra engine demoiished piane has since rebuiit 42 Model Aviation Chuck Fuller swings prop Kawasaki 315-powered Waco Taperwing L aerobatic prototype flown Johnny Livingston now housed EAA museum Oshkosh WI Scratch-bulit modei quarter-scais spans 92 weighs 30 ib Mrs Fuiierassists Lockheed P-38L lafrom Royal Kit CR lathe work Maury Maroney Power pair 08 45g FinIsh im ron paint over K&B resin glass cloth Model spans 74inches Check flexing pressing downward elevator should resist motion until servo output wheel rotates Avoid long wire torque rods operate ailerons open invitation aileron flutter average 60-size airplane wire longer four inches should 1-in music wire rather ordinary /,-in better use 8A2-in OD aluminum tube A-in birch dowel end-inserts epoxied pinned end resist twist flits pieces Fiction music wire tough material cant threaded Fact have done often Wire 1-in diameter can threaded No 5-40 die %2-in diameter wire No 8-32 Y6-in wire No 10-32 trick approach job caution prevent damage both wire thread-cutting dies Its slow process need frequent application threading lubricant use Moly-Dee tapping fluid smelly substance like very thick oil produced Withrow Co intended cutting clean threads beginning cut best chamfer wire end easy start make revolution die before backing off relubricate second pass cut half revolution start again adding another drop Moly-Dee After cut thread A-turn increments always backing off die clear tough music wire chips job isnt easy always feeling something about break have managed cut least half-dozen clean threads threaded end music wire provides extra-strong method fastening two wires landing gear junctions prototypical manner Its true music wire can also brazed once metal has brought up red heat torch no longer music wire ever wire used model strict tension compression modes remains stronger need purposes ap plications brazed joint subjected bending stress music wire no better ordinary cold-rolled steel will bend like wet noodle Heat treatment quenching restore spring wire its original properties outside capabilities model ers have tried heating quenching water reharden music wire success does hardenbut brittleness like glass will break easily vicious snap joint must strong resistance bending consider using soft solder over greater area brass steel tube over wire spread load enough wetted area solder along music wire joint reasonable strength can made couple myths about RC Scale models proven incorrect Leeourget Scale World Championships often-heard story about loss radio control metal airplanes now known fiction least modern radio equipment winning deHavilland Drover completely aluminumcovered over balsa base antenna routed outside during its flights seeing metal-covered well complete ly-metal-built models being flown success experience aluminum litho-plate sheeting has used wide areas fuselage ill effects Some old myths die hard about undercambered airfoils being difficult control laid rest LeBourget second-place Avro 504K absolutely Continued page 134 -pLSS~ ISA~GO CUT 1/4 DEEP SLIT ALLR/G TIE FULL LENGTH O THE MATAI/G IGAPFACES Still Using bid Fashioned Wing Hinges will gain control efficiency eliminating gap between moveable stationary control surfacesEASY TO INSTALL will amazed performance gained using simple inexpen-1 sive improvementiFREE MOVEMENT450 STRONG AND LIGHTWEIGHTc~- ASTALL HA/GEUSE COMPLETELY FUELPROOF-2 STRAIGHT PIN TO MAKE COMPATABLE WITH ALL IRON-ONDRIP CYANOALWYLA7E MATERIALSELLE HO ESCAPtLAAT IN CARRY GLUE 4104/6 EN rIPE JOINT COMES IN 3 PT LENGTHS SMALL 118 ORPRICE 3 ft $250-FOR ADD AdS/4L SED39IT1 LARGE 1/43 A/SENT 54ALL PIN EVER FEW NCHES CUT OFF F US/I FLL AND SAND AS dEEDED FOR FIRISHING Send Free Info f ne products FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97115 PO BOX 911 DIDDIflIIETC 916j 36S-6700 ANDERSON CA 96007lbEu write brochure Specializing ZENOAH/MiLONEY/SACHS-DOLMAR Quality EngInes Hd K SUPERSTARTER MK il Fits QUADRAS AND G-38 $2495 Also NowAvailableFor G-62 $2995 ENGINESKITS ZENOAH 0-231/2995SACHS DOLMAR 37 W/MUPFLER529995MODEL TECH KITS ZENOAH 0-381/2495PornO ye/sarI72 CAP 2/ 117995 ZENOAI-I G-62S /9995SACHS DOLMAJI 37 W/MUFFLER04995RIO UGLY STICK 09795 CUSTOM 0-38S 6995Sp/ing Slarter CD IgnitronThese Fantastrc Eeactr-BuiIt CUSTOM 0-38S18995SACHS DO/MAR 52536500Balsa Kits Perfect/or WlSpong Starre/ -W/Sprrog S/PIerMALONEY SE OEO-23 NEW Maloney 100 1 01 Gasoline Engine wlnsufflerS12995. Replace balky alcohol burnbig mess making prop spitting dead stIck landIng 4 cycle 120 wIth MALONEY 100 Easy startIng reliable economIcal 108 mention cleaner less expensive PIROPSIZharI DHESIVES IPKi /8o6-10/895201 sLOW CA$595 1808-145&95200 IMI CA/595 2006-IS$10955 MIN EPOXY/S ozlS650 20/8-1411095SM/N EPOXY /9 oa/SESO 22o6-I0S 109530 MIN EPOXY/S oziS/SO Add U SOfa UPs Handtto9 eac/t order COO addoonat U SO Ktts add /75/to UPS VI5AIMC now accepted Pttcestubjeot change wrtrout THE STANDARD CONTACT ADHESIVE FOR SHEETING FOAM WINGS WILL NOT ATTACK STYROFOAM CORES MIScELLANEOuS CR 14 5CAIO TAIL WHEEL5/395 NOR POWERPLUG5250 ASISOIL 00-I OIL/290 WORLD 5-16/FLSTARA//2495 0-38 MOUNT/1795 C R5PINNER5/-30%/ WORLD TM /WHITE/5695 SOUTHERNS SORGHUM & FLEXALL PLASTICIZER FOR ACRYLICS AND DOPES STOPS CRACKING AND CHIPPING SEE YOUR DEALER OR DISTRIBUTOR DAVE BROWN PRODUCTS 4560 Layhigh Hamilton OH 45013 513 738-1576 July1986 43 GAPLESS HiNGE SLOTTER Simplifies installation Gapless Hinges Makes Slots 4 Sizes 01 Balsa IG I5 RICE $250 OUADRA 82 /1 ONLYI 525995 Two channel wheel radio unbeatable performance Servo reversing & end point adjustments both channels Continuously adjustable steering rate Adjustable steering wheel tension lncludes receiver switch harness battery holder Comes withwo JRS5O5 servos Available 2TMHz 9fLV An extremely reliable radio Two channel system cars boats lncludes battery case drycells receiver two JRS5O5 servos Available 27 MHz BOTH RADIOS ARE COVERED BY CIRCUS HOBBIES WARRANTY TAKE ADVANTAGE OF OUR ERROR AND SAVE WHILE SUPPLIES LAST PRICES SUBJECT TO CHANGE TED TO QUANTITY ON HAND CALL TOLL FREE NOW TO PLACE YOUR ORDER 800 782-0022 3132 S HIGHLAND DRIVE VEGAS NEVADA 89109 Radio Technique/Myers Continued page 131 tones pocket pager will almost always sound mushy AM perfectly clear FM Contact District Frequency Coordina tor information loan scanner name will found AMA News sec tion right under District VPs name picture dont know what district Look state listed above VP col umns AMA News George M Myers 70 Froehlich Farm Rd HicksvIIe NY 11801 Good-Bad/Layers Continued page 40 weight behind hinges greater problem becomes Ailerons seem especially susceptible Invest tough heavy materials areas take control surface stresses hinge points control horn mountings Keep rest structure light possible Static dynamic balancing topics another time selecting wood construction gen erally speaking high-density wood tougher heavier low-density wood weaker lighter Select wood its purpose regarding strength weight ailerons mentioned before prefer high-density wood sub-spar mounts hinges low-density trailing edge reduce weight aft hinge line Analyze structure youre building take time select proper materials Lets talk about covering may Strohs man happen MonoKote man covering planes past always felt type covering added undue amount weight pleased find covering accounted 5Yi% total weight came 9 oz5 wing 2 fuselage 1 tail Considering MonoKotes toughness great finish considerable amount strength adds built-up structures think terrific investment weight fact bargain havent tried everything shop around check manufacturers spec sheets weight conscious well color con scious about nice-to-have dontreally-need items some planes lug around plane have exhaust pipe extension keep plane little cleaner C-size onboard booster NiCd convenience Theyre nice have add 3 oz plane may have gone overboard first couple planes used tubular nylon pushrods soon convinced expansion contraction tem perature changes wanted put up Since Ive used hardwood dowel pushrods logic telling larger plane larger dowel should Too late correct now estimate four-dowel pushrods Y16 dia threaded rod ends weigh little dds up Ill have rethink last point wed best close hangar doors Design own planes Think youve got some neat ideas Well think huge windshield neat weighs about 2 oz Doesnt sound bad until call eighth pound thats weightand thats name game See Sunday RC Scale/Wischers Continued page 43 stable air course lack wind during its flights helped model its high placing scoring bonus undercam bered airfoil now debatable subject FAI rules real reason problems such wing its inherent weakness same true very thin wings biplane Shallow depth spars requires made hardwood wire interstrut bracing becomes truly functional Muffler pressure Reliable muffler pressure fuel tank necessity reducing change fuel flow between full emp ty tank have used silicone rubber tube tank filling plugged after filling seal against pressure loss plug prefer machine screw Too coarse thread 134 Model Aviation - sent us tne wrong oraer ana over stocke radios leading sellers Japan identical er 2 Circus 2 radios except label price ALPINAZ BEAT 2 STICK RADIO 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
Edition: Model Aviation - 1986/07
Page Numbers: 42, 43, 134, 135
Radio Control Scale Bob Dolly Wischer FACT OR FICTION fictional theories about model flying importance scale effect bugaboo past supposedly kept model flying man ner somewhat similar its prototype have asked whether scale effect makes changes necessary airfoils tail surface areas answer present-day RC Scale models dont need changes no doubt scale effect factor very small light slow-flying models such Peanut Scale rubber-powered Schoolyard Scale RC types However size models now flying 40 60 120 engines effect isnt evident really accentuated experience compare flight mod els exact full-size counterparts find remarkable similarities Giant Scale models like prototypes distant past Scale models provided enlarged tail surfaces because ex pected instability problems None exist ing Scale models have non-scale control surface areas World War aircraft models may have root some horror stories about need increased area Morane-Saul nier Parasol Monoplane miniscule eleva tor no stabilizer gave type evil reputation being tricky sensitive flight Hazards flight probably equal enemy gunfire contrast Sopwith Strutter stabilizer/elevator com bination enormous area making threepoint landing difficult Models flown fast aerobatically susceptible control surface flutter rarely occurs slower speeds Pure fic tion Slow-flying models extremely light structure can also develop flutter problem light structures will endure stress imposed tight covering material cover permitted sag least isnt shrunken tightly wing type built-in flexibility can develop flutter slow speed have heard example complete wing flutteredand model wasnt equipped ailerons sufficient twist structure due softness surface covering material permit oscillations begin Once initiated flutter amplitude increased wing destroyed itself What started shallow dive wind gust engine vibration un balanced prop passing through rpm region causing resonance Tightly-stretched covering material stiffens light structure resist twist Returning earlier statement its usual ly speed brings destructive flutter can result number causes such flexible pushrods torque rods soft broken hinges free play control system soft flexible material control sur face itself An often-overlooked source flex ibility can lead flutter plastic hinges supported point immediately adjacent hinge pin have guilty promoting weakness cutting away wedge balsa barrel portion hinge inset wing aileron nogap fit between surfaces Cut bit too deeply no support near hinge pin can result transverse motion across hinge age condition worsens finally hear ominous whir flutter bottom loop whenever speed creases model can slowed instantly may survive flutter occurs 50-50 chance will serious damage open clevis end pushrod broken teeth servo gears fractured control horn af fected surface sudden departure control surface loud buzz fluttering surface can heard above engine prop noise sound flag strong wind similar flag control surface have common reason fluttering fast-flowing air Stiffen soft control system during model construction using several plywood fairleads wire pushrods through wing Holes plywood A-in music wire should about %2-in diameter bend rod represents point easy deflection pro motes softness system like manner should no bends wire ends wood-dowel elevator rudder pushrod Dick Speldel L used Nick ZIroil fiberglass fusciage constructing AT-S Wing baisa-over-foam covered giass cioth Power 4-cu-ln Hornet DIck made own shock-absorbing retracts Boston worm gears support 29-ib weight Aiuminum split fiaps operated torque tubes Finish Hobbypoxy epoxy paint Jim Messers 1/4-scale Bristol Scout R wing faiiure flutter gusty wind conditions K-W Raiiy Quadra engine demoiished piane has since rebuiit 42 Model Aviation Chuck Fuller swings prop Kawasaki 315-powered Waco Taperwing L aerobatic prototype flown Johnny Livingston now housed EAA museum Oshkosh WI Scratch-bulit modei quarter-scais spans 92 weighs 30 ib Mrs Fuiierassists Lockheed P-38L lafrom Royal Kit CR lathe work Maury Maroney Power pair 08 45g FinIsh im ron paint over K&B resin glass cloth Model spans 74inches Check flexing pressing downward elevator should resist motion until servo output wheel rotates Avoid long wire torque rods operate ailerons open invitation aileron flutter average 60-size airplane wire longer four inches should 1-in music wire rather ordinary /,-in better use 8A2-in OD aluminum tube A-in birch dowel end-inserts epoxied pinned end resist twist flits pieces Fiction music wire tough material cant threaded Fact have done often Wire 1-in diameter can threaded No 5-40 die %2-in diameter wire No 8-32 Y6-in wire No 10-32 trick approach job caution prevent damage both wire thread-cutting dies Its slow process need frequent application threading lubricant use Moly-Dee tapping fluid smelly substance like very thick oil produced Withrow Co intended cutting clean threads beginning cut best chamfer wire end easy start make revolution die before backing off relubricate second pass cut half revolution start again adding another drop Moly-Dee After cut thread A-turn increments always backing off die clear tough music wire chips job isnt easy always feeling something about break have managed cut least half-dozen clean threads threaded end music wire provides extra-strong method fastening two wires landing gear junctions prototypical manner Its true music wire can also brazed once metal has brought up red heat torch no longer music wire ever wire used model strict tension compression modes remains stronger need purposes ap plications brazed joint subjected bending stress music wire no better ordinary cold-rolled steel will bend like wet noodle Heat treatment quenching restore spring wire its original properties outside capabilities model ers have tried heating quenching water reharden music wire success does hardenbut brittleness like glass will break easily vicious snap joint must strong resistance bending consider using soft solder over greater area brass steel tube over wire spread load enough wetted area solder along music wire joint reasonable strength can made couple myths about RC Scale models proven incorrect Leeourget Scale World Championships often-heard story about loss radio control metal airplanes now known fiction least modern radio equipment winning deHavilland Drover completely aluminumcovered over balsa base antenna routed outside during its flights seeing metal-covered well complete ly-metal-built models being flown success experience aluminum litho-plate sheeting has used wide areas fuselage ill effects Some old myths die hard about undercambered airfoils being difficult control laid rest LeBourget second-place Avro 504K absolutely Continued page 134 -pLSS~ ISA~GO CUT 1/4 DEEP SLIT ALLR/G TIE FULL LENGTH O THE MATAI/G IGAPFACES Still Using bid Fashioned Wing Hinges will gain control efficiency eliminating gap between moveable stationary control surfacesEASY TO INSTALL will amazed performance gained using simple inexpen-1 sive improvementiFREE MOVEMENT450 STRONG AND LIGHTWEIGHTc~- ASTALL HA/GEUSE COMPLETELY FUELPROOF-2 STRAIGHT PIN TO MAKE COMPATABLE WITH ALL IRON-ONDRIP CYANOALWYLA7E MATERIALSELLE HO ESCAPtLAAT IN CARRY GLUE 4104/6 EN rIPE JOINT COMES IN 3 PT LENGTHS SMALL 118 ORPRICE 3 ft $250-FOR ADD AdS/4L SED39IT1 LARGE 1/43 A/SENT 54ALL PIN EVER FEW NCHES CUT OFF F US/I FLL AND SAND AS dEEDED FOR FIRISHING Send Free Info f ne products FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97115 PO BOX 911 DIDDIflIIETC 916j 36S-6700 ANDERSON CA 96007lbEu write brochure Specializing ZENOAH/MiLONEY/SACHS-DOLMAR Quality EngInes Hd K SUPERSTARTER MK il Fits QUADRAS AND G-38 $2495 Also NowAvailableFor G-62 $2995 ENGINESKITS ZENOAH 0-231/2995SACHS DOLMAR 37 W/MUPFLER529995MODEL TECH KITS ZENOAH 0-381/2495PornO ye/sarI72 CAP 2/ 117995 ZENOAI-I G-62S /9995SACHS DOLMAJI 37 W/MUFFLER04995RIO UGLY STICK 09795 CUSTOM 0-38S 6995Sp/ing Slarter CD IgnitronThese Fantastrc Eeactr-BuiIt CUSTOM 0-38S18995SACHS DO/MAR 52536500Balsa Kits Perfect/or WlSpong Starre/ -W/Sprrog S/PIerMALONEY SE OEO-23 NEW Maloney 100 1 01 Gasoline Engine wlnsufflerS12995. Replace balky alcohol burnbig mess making prop spitting dead stIck landIng 4 cycle 120 wIth MALONEY 100 Easy startIng reliable economIcal 108 mention cleaner less expensive PIROPSIZharI DHESIVES IPKi /8o6-10/895201 sLOW CA$595 1808-145&95200 IMI CA/595 2006-IS$10955 MIN EPOXY/S ozlS650 20/8-1411095SM/N EPOXY /9 oa/SESO 22o6-I0S 109530 MIN EPOXY/S oziS/SO Add U SOfa UPs Handtto9 eac/t order COO addoonat U SO Ktts add /75/to UPS VI5AIMC now accepted Pttcestubjeot change wrtrout THE STANDARD CONTACT ADHESIVE FOR SHEETING FOAM WINGS WILL NOT ATTACK STYROFOAM CORES MIScELLANEOuS CR 14 5CAIO TAIL WHEEL5/395 NOR POWERPLUG5250 ASISOIL 00-I OIL/290 WORLD 5-16/FLSTARA//2495 0-38 MOUNT/1795 C R5PINNER5/-30%/ WORLD TM /WHITE/5695 SOUTHERNS SORGHUM & FLEXALL PLASTICIZER FOR ACRYLICS AND DOPES STOPS CRACKING AND CHIPPING SEE YOUR DEALER OR DISTRIBUTOR DAVE BROWN PRODUCTS 4560 Layhigh Hamilton OH 45013 513 738-1576 July1986 43 GAPLESS HiNGE SLOTTER Simplifies installation Gapless Hinges Makes Slots 4 Sizes 01 Balsa IG I5 RICE $250 OUADRA 82 /1 ONLYI 525995 Two channel wheel radio unbeatable performance Servo reversing & end point adjustments both channels Continuously adjustable steering rate Adjustable steering wheel tension lncludes receiver switch harness battery holder Comes withwo JRS5O5 servos Available 2TMHz 9fLV An extremely reliable radio Two channel system cars boats lncludes battery case drycells receiver two JRS5O5 servos Available 27 MHz BOTH RADIOS ARE COVERED BY CIRCUS HOBBIES WARRANTY TAKE ADVANTAGE OF OUR ERROR AND SAVE WHILE SUPPLIES LAST PRICES SUBJECT TO CHANGE TED TO QUANTITY ON HAND CALL TOLL FREE NOW TO PLACE YOUR ORDER 800 782-0022 3132 S HIGHLAND DRIVE VEGAS NEVADA 89109 Radio Technique/Myers Continued page 131 tones pocket pager will almost always sound mushy AM perfectly clear FM Contact District Frequency Coordina tor information loan scanner name will found AMA News sec tion right under District VPs name picture dont know what district Look state listed above VP col umns AMA News George M Myers 70 Froehlich Farm Rd HicksvIIe NY 11801 Good-Bad/Layers Continued page 40 weight behind hinges greater problem becomes Ailerons seem especially susceptible Invest tough heavy materials areas take control surface stresses hinge points control horn mountings Keep rest structure light possible Static dynamic balancing topics another time selecting wood construction gen erally speaking high-density wood tougher heavier low-density wood weaker lighter Select wood its purpose regarding strength weight ailerons mentioned before prefer high-density wood sub-spar mounts hinges low-density trailing edge reduce weight aft hinge line Analyze structure youre building take time select proper materials Lets talk about covering may Strohs man happen MonoKote man covering planes past always felt type covering added undue amount weight pleased find covering accounted 5Yi% total weight came 9 oz5 wing 2 fuselage 1 tail Considering MonoKotes toughness great finish considerable amount strength adds built-up structures think terrific investment weight fact bargain havent tried everything shop around check manufacturers spec sheets weight conscious well color con scious about nice-to-have dontreally-need items some planes lug around plane have exhaust pipe extension keep plane little cleaner C-size onboard booster NiCd convenience Theyre nice have add 3 oz plane may have gone overboard first couple planes used tubular nylon pushrods soon convinced expansion contraction tem perature changes wanted put up Since Ive used hardwood dowel pushrods logic telling larger plane larger dowel should Too late correct now estimate four-dowel pushrods Y16 dia threaded rod ends weigh little dds up Ill have rethink last point wed best close hangar doors Design own planes Think youve got some neat ideas Well think huge windshield neat weighs about 2 oz Doesnt sound bad until call eighth pound thats weightand thats name game See Sunday RC Scale/Wischers Continued page 43 stable air course lack wind during its flights helped model its high placing scoring bonus undercam bered airfoil now debatable subject FAI rules real reason problems such wing its inherent weakness same true very thin wings biplane Shallow depth spars requires made hardwood wire interstrut bracing becomes truly functional Muffler pressure Reliable muffler pressure fuel tank necessity reducing change fuel flow between full emp ty tank have used silicone rubber tube tank filling plugged after filling seal against pressure loss plug prefer machine screw Too coarse thread 134 Model Aviation - sent us tne wrong oraer ana over stocke radios leading sellers Japan identical er 2 Circus 2 radios except label price ALPINAZ BEAT 2 STICK RADIO 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
Edition: Model Aviation - 1986/07
Page Numbers: 42, 43, 134, 135
Radio Control Scale Bob Dolly Wischer FACT OR FICTION fictional theories about model flying importance scale effect bugaboo past supposedly kept model flying man ner somewhat similar its prototype have asked whether scale effect makes changes necessary airfoils tail surface areas answer present-day RC Scale models dont need changes no doubt scale effect factor very small light slow-flying models such Peanut Scale rubber-powered Schoolyard Scale RC types However size models now flying 40 60 120 engines effect isnt evident really accentuated experience compare flight mod els exact full-size counterparts find remarkable similarities Giant Scale models like prototypes distant past Scale models provided enlarged tail surfaces because ex pected instability problems None exist ing Scale models have non-scale control surface areas World War aircraft models may have root some horror stories about need increased area Morane-Saul nier Parasol Monoplane miniscule eleva tor no stabilizer gave type evil reputation being tricky sensitive flight Hazards flight probably equal enemy gunfire contrast Sopwith Strutter stabilizer/elevator com bination enormous area making threepoint landing difficult Models flown fast aerobatically susceptible control surface flutter rarely occurs slower speeds Pure fic tion Slow-flying models extremely light structure can also develop flutter problem light structures will endure stress imposed tight covering material cover permitted sag least isnt shrunken tightly wing type built-in flexibility can develop flutter slow speed have heard example complete wing flutteredand model wasnt equipped ailerons sufficient twist structure due softness surface covering material permit oscillations begin Once initiated flutter amplitude increased wing destroyed itself What started shallow dive wind gust engine vibration un balanced prop passing through rpm region causing resonance Tightly-stretched covering material stiffens light structure resist twist Returning earlier statement its usual ly speed brings destructive flutter can result number causes such flexible pushrods torque rods soft broken hinges free play control system soft flexible material control sur face itself An often-overlooked source flex ibility can lead flutter plastic hinges supported point immediately adjacent hinge pin have guilty promoting weakness cutting away wedge balsa barrel portion hinge inset wing aileron nogap fit between surfaces Cut bit too deeply no support near hinge pin can result transverse motion across hinge age condition worsens finally hear ominous whir flutter bottom loop whenever speed creases model can slowed instantly may survive flutter occurs 50-50 chance will serious damage open clevis end pushrod broken teeth servo gears fractured control horn af fected surface sudden departure control surface loud buzz fluttering surface can heard above engine prop noise sound flag strong wind similar flag control surface have common reason fluttering fast-flowing air Stiffen soft control system during model construction using several plywood fairleads wire pushrods through wing Holes plywood A-in music wire should about %2-in diameter bend rod represents point easy deflection pro motes softness system like manner should no bends wire ends wood-dowel elevator rudder pushrod Dick Speldel L used Nick ZIroil fiberglass fusciage constructing AT-S Wing baisa-over-foam covered giass cioth Power 4-cu-ln Hornet DIck made own shock-absorbing retracts Boston worm gears support 29-ib weight Aiuminum split fiaps operated torque tubes Finish Hobbypoxy epoxy paint Jim Messers 1/4-scale Bristol Scout R wing faiiure flutter gusty wind conditions K-W Raiiy Quadra engine demoiished piane has since rebuiit 42 Model Aviation Chuck Fuller swings prop Kawasaki 315-powered Waco Taperwing L aerobatic prototype flown Johnny Livingston now housed EAA museum Oshkosh WI Scratch-bulit modei quarter-scais spans 92 weighs 30 ib Mrs Fuiierassists Lockheed P-38L lafrom Royal Kit CR lathe work Maury Maroney Power pair 08 45g FinIsh im ron paint over K&B resin glass cloth Model spans 74inches Check flexing pressing downward elevator should resist motion until servo output wheel rotates Avoid long wire torque rods operate ailerons open invitation aileron flutter average 60-size airplane wire longer four inches should 1-in music wire rather ordinary /,-in better use 8A2-in OD aluminum tube A-in birch dowel end-inserts epoxied pinned end resist twist flits pieces Fiction music wire tough material cant threaded Fact have done often Wire 1-in diameter can threaded No 5-40 die %2-in diameter wire No 8-32 Y6-in wire No 10-32 trick approach job caution prevent damage both wire thread-cutting dies Its slow process need frequent application threading lubricant use Moly-Dee tapping fluid smelly substance like very thick oil produced Withrow Co intended cutting clean threads beginning cut best chamfer wire end easy start make revolution die before backing off relubricate second pass cut half revolution start again adding another drop Moly-Dee After cut thread A-turn increments always backing off die clear tough music wire chips job isnt easy always feeling something about break have managed cut least half-dozen clean threads threaded end music wire provides extra-strong method fastening two wires landing gear junctions prototypical manner Its true music wire can also brazed once metal has brought up red heat torch no longer music wire ever wire used model strict tension compression modes remains stronger need purposes ap plications brazed joint subjected bending stress music wire no better ordinary cold-rolled steel will bend like wet noodle Heat treatment quenching restore spring wire its original properties outside capabilities model ers have tried heating quenching water reharden music wire success does hardenbut brittleness like glass will break easily vicious snap joint must strong resistance bending consider using soft solder over greater area brass steel tube over wire spread load enough wetted area solder along music wire joint reasonable strength can made couple myths about RC Scale models proven incorrect Leeourget Scale World Championships often-heard story about loss radio control metal airplanes now known fiction least modern radio equipment winning deHavilland Drover completely aluminumcovered over balsa base antenna routed outside during its flights seeing metal-covered well complete ly-metal-built models being flown success experience aluminum litho-plate sheeting has used wide areas fuselage ill effects Some old myths die hard about undercambered airfoils being difficult control laid rest LeBourget second-place Avro 504K absolutely Continued page 134 -pLSS~ ISA~GO CUT 1/4 DEEP SLIT ALLR/G TIE FULL LENGTH O THE MATAI/G IGAPFACES Still Using bid Fashioned Wing Hinges will gain control efficiency eliminating gap between moveable stationary control surfacesEASY TO INSTALL will amazed performance gained using simple inexpen-1 sive improvementiFREE MOVEMENT450 STRONG AND LIGHTWEIGHTc~- ASTALL HA/GEUSE COMPLETELY FUELPROOF-2 STRAIGHT PIN TO MAKE COMPATABLE WITH ALL IRON-ONDRIP CYANOALWYLA7E MATERIALSELLE HO ESCAPtLAAT IN CARRY GLUE 4104/6 EN rIPE JOINT COMES IN 3 PT LENGTHS SMALL 118 ORPRICE 3 ft $250-FOR ADD AdS/4L SED39IT1 LARGE 1/43 A/SENT 54ALL PIN EVER FEW NCHES CUT OFF F US/I FLL AND SAND AS dEEDED FOR FIRISHING Send Free Info f ne products FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97115 PO BOX 911 DIDDIflIIETC 916j 36S-6700 ANDERSON CA 96007lbEu write brochure Specializing ZENOAH/MiLONEY/SACHS-DOLMAR Quality EngInes Hd K SUPERSTARTER MK il Fits QUADRAS AND G-38 $2495 Also NowAvailableFor G-62 $2995 ENGINESKITS ZENOAH 0-231/2995SACHS DOLMAR 37 W/MUPFLER529995MODEL TECH KITS ZENOAH 0-381/2495PornO ye/sarI72 CAP 2/ 117995 ZENOAI-I G-62S /9995SACHS DOLMAJI 37 W/MUFFLER04995RIO UGLY STICK 09795 CUSTOM 0-38S 6995Sp/ing Slarter CD IgnitronThese Fantastrc Eeactr-BuiIt CUSTOM 0-38S18995SACHS DO/MAR 52536500Balsa Kits Perfect/or WlSpong Starre/ -W/Sprrog S/PIerMALONEY SE OEO-23 NEW Maloney 100 1 01 Gasoline Engine wlnsufflerS12995. Replace balky alcohol burnbig mess making prop spitting dead stIck landIng 4 cycle 120 wIth MALONEY 100 Easy startIng reliable economIcal 108 mention cleaner less expensive PIROPSIZharI DHESIVES IPKi /8o6-10/895201 sLOW CA$595 1808-145&95200 IMI CA/595 2006-IS$10955 MIN EPOXY/S ozlS650 20/8-1411095SM/N EPOXY /9 oa/SESO 22o6-I0S 109530 MIN EPOXY/S oziS/SO Add U SOfa UPs Handtto9 eac/t order COO addoonat U SO Ktts add /75/to UPS VI5AIMC now accepted Pttcestubjeot change wrtrout THE STANDARD CONTACT ADHESIVE FOR SHEETING FOAM WINGS WILL NOT ATTACK STYROFOAM CORES MIScELLANEOuS CR 14 5CAIO TAIL WHEEL5/395 NOR POWERPLUG5250 ASISOIL 00-I OIL/290 WORLD 5-16/FLSTARA//2495 0-38 MOUNT/1795 C R5PINNER5/-30%/ WORLD TM /WHITE/5695 SOUTHERNS SORGHUM & FLEXALL PLASTICIZER FOR ACRYLICS AND DOPES STOPS CRACKING AND CHIPPING SEE YOUR DEALER OR DISTRIBUTOR DAVE BROWN PRODUCTS 4560 Layhigh Hamilton OH 45013 513 738-1576 July1986 43 GAPLESS HiNGE SLOTTER Simplifies installation Gapless Hinges Makes Slots 4 Sizes 01 Balsa IG I5 RICE $250 OUADRA 82 /1 ONLYI 525995 Two channel wheel radio unbeatable performance Servo reversing & end point adjustments both channels Continuously adjustable steering rate Adjustable steering wheel tension lncludes receiver switch harness battery holder Comes withwo JRS5O5 servos Available 2TMHz 9fLV An extremely reliable radio Two channel system cars boats lncludes battery case drycells receiver two JRS5O5 servos Available 27 MHz BOTH RADIOS ARE COVERED BY CIRCUS HOBBIES WARRANTY TAKE ADVANTAGE OF OUR ERROR AND SAVE WHILE SUPPLIES LAST PRICES SUBJECT TO CHANGE TED TO QUANTITY ON HAND CALL TOLL FREE NOW TO PLACE YOUR ORDER 800 782-0022 3132 S HIGHLAND DRIVE VEGAS NEVADA 89109 Radio Technique/Myers Continued page 131 tones pocket pager will almost always sound mushy AM perfectly clear FM Contact District Frequency Coordina tor information loan scanner name will found AMA News sec tion right under District VPs name picture dont know what district Look state listed above VP col umns AMA News George M Myers 70 Froehlich Farm Rd HicksvIIe NY 11801 Good-Bad/Layers Continued page 40 weight behind hinges greater problem becomes Ailerons seem especially susceptible Invest tough heavy materials areas take control surface stresses hinge points control horn mountings Keep rest structure light possible Static dynamic balancing topics another time selecting wood construction gen erally speaking high-density wood tougher heavier low-density wood weaker lighter Select wood its purpose regarding strength weight ailerons mentioned before prefer high-density wood sub-spar mounts hinges low-density trailing edge reduce weight aft hinge line Analyze structure youre building take time select proper materials Lets talk about covering may Strohs man happen MonoKote man covering planes past always felt type covering added undue amount weight pleased find covering accounted 5Yi% total weight came 9 oz5 wing 2 fuselage 1 tail Considering MonoKotes toughness great finish considerable amount strength adds built-up structures think terrific investment weight fact bargain havent tried everything shop around check manufacturers spec sheets weight conscious well color con scious about nice-to-have dontreally-need items some planes lug around plane have exhaust pipe extension keep plane little cleaner C-size onboard booster NiCd convenience Theyre nice have add 3 oz plane may have gone overboard first couple planes used tubular nylon pushrods soon convinced expansion contraction tem perature changes wanted put up Since Ive used hardwood dowel pushrods logic telling larger plane larger dowel should Too late correct now estimate four-dowel pushrods Y16 dia threaded rod ends weigh little dds up Ill have rethink last point wed best close hangar doors Design own planes Think youve got some neat ideas Well think huge windshield neat weighs about 2 oz Doesnt sound bad until call eighth pound thats weightand thats name game See Sunday RC Scale/Wischers Continued page 43 stable air course lack wind during its flights helped model its high placing scoring bonus undercam bered airfoil now debatable subject FAI rules real reason problems such wing its inherent weakness same true very thin wings biplane Shallow depth spars requires made hardwood wire interstrut bracing becomes truly functional Muffler pressure Reliable muffler pressure fuel tank necessity reducing change fuel flow between full emp ty tank have used silicone rubber tube tank filling plugged after filling seal against pressure loss plug prefer machine screw Too coarse thread 134 Model Aviation - sent us tne wrong oraer ana over stocke radios leading sellers Japan identical er 2 Circus 2 radios except label price ALPINAZ BEAT 2 STICK RADIO 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
Edition: Model Aviation - 1986/07
Page Numbers: 42, 43, 134, 135
Radio Control Scale Bob Dolly Wischer FACT OR FICTION fictional theories about model flying importance scale effect bugaboo past supposedly kept model flying man ner somewhat similar its prototype have asked whether scale effect makes changes necessary airfoils tail surface areas answer present-day RC Scale models dont need changes no doubt scale effect factor very small light slow-flying models such Peanut Scale rubber-powered Schoolyard Scale RC types However size models now flying 40 60 120 engines effect isnt evident really accentuated experience compare flight mod els exact full-size counterparts find remarkable similarities Giant Scale models like prototypes distant past Scale models provided enlarged tail surfaces because ex pected instability problems None exist ing Scale models have non-scale control surface areas World War aircraft models may have root some horror stories about need increased area Morane-Saul nier Parasol Monoplane miniscule eleva tor no stabilizer gave type evil reputation being tricky sensitive flight Hazards flight probably equal enemy gunfire contrast Sopwith Strutter stabilizer/elevator com bination enormous area making threepoint landing difficult Models flown fast aerobatically susceptible control surface flutter rarely occurs slower speeds Pure fic tion Slow-flying models extremely light structure can also develop flutter problem light structures will endure stress imposed tight covering material cover permitted sag least isnt shrunken tightly wing type built-in flexibility can develop flutter slow speed have heard example complete wing flutteredand model wasnt equipped ailerons sufficient twist structure due softness surface covering material permit oscillations begin Once initiated flutter amplitude increased wing destroyed itself What started shallow dive wind gust engine vibration un balanced prop passing through rpm region causing resonance Tightly-stretched covering material stiffens light structure resist twist Returning earlier statement its usual ly speed brings destructive flutter can result number causes such flexible pushrods torque rods soft broken hinges free play control system soft flexible material control sur face itself An often-overlooked source flex ibility can lead flutter plastic hinges supported point immediately adjacent hinge pin have guilty promoting weakness cutting away wedge balsa barrel portion hinge inset wing aileron nogap fit between surfaces Cut bit too deeply no support near hinge pin can result transverse motion across hinge age condition worsens finally hear ominous whir flutter bottom loop whenever speed creases model can slowed instantly may survive flutter occurs 50-50 chance will serious damage open clevis end pushrod broken teeth servo gears fractured control horn af fected surface sudden departure control surface loud buzz fluttering surface can heard above engine prop noise sound flag strong wind similar flag control surface have common reason fluttering fast-flowing air Stiffen soft control system during model construction using several plywood fairleads wire pushrods through wing Holes plywood A-in music wire should about %2-in diameter bend rod represents point easy deflection pro motes softness system like manner should no bends wire ends wood-dowel elevator rudder pushrod Dick Speldel L used Nick ZIroil fiberglass fusciage constructing AT-S Wing baisa-over-foam covered giass cioth Power 4-cu-ln Hornet DIck made own shock-absorbing retracts Boston worm gears support 29-ib weight Aiuminum split fiaps operated torque tubes Finish Hobbypoxy epoxy paint Jim Messers 1/4-scale Bristol Scout R wing faiiure flutter gusty wind conditions K-W Raiiy Quadra engine demoiished piane has since rebuiit 42 Model Aviation Chuck Fuller swings prop Kawasaki 315-powered Waco Taperwing L aerobatic prototype flown Johnny Livingston now housed EAA museum Oshkosh WI Scratch-bulit modei quarter-scais spans 92 weighs 30 ib Mrs Fuiierassists Lockheed P-38L lafrom Royal Kit CR lathe work Maury Maroney Power pair 08 45g FinIsh im ron paint over K&B resin glass cloth Model spans 74inches Check flexing pressing downward elevator should resist motion until servo output wheel rotates Avoid long wire torque rods operate ailerons open invitation aileron flutter average 60-size airplane wire longer four inches should 1-in music wire rather ordinary /,-in better use 8A2-in OD aluminum tube A-in birch dowel end-inserts epoxied pinned end resist twist flits pieces Fiction music wire tough material cant threaded Fact have done often Wire 1-in diameter can threaded No 5-40 die %2-in diameter wire No 8-32 Y6-in wire No 10-32 trick approach job caution prevent damage both wire thread-cutting dies Its slow process need frequent application threading lubricant use Moly-Dee tapping fluid smelly substance like very thick oil produced Withrow Co intended cutting clean threads beginning cut best chamfer wire end easy start make revolution die before backing off relubricate second pass cut half revolution start again adding another drop Moly-Dee After cut thread A-turn increments always backing off die clear tough music wire chips job isnt easy always feeling something about break have managed cut least half-dozen clean threads threaded end music wire provides extra-strong method fastening two wires landing gear junctions prototypical manner Its true music wire can also brazed once metal has brought up red heat torch no longer music wire ever wire used model strict tension compression modes remains stronger need purposes ap plications brazed joint subjected bending stress music wire no better ordinary cold-rolled steel will bend like wet noodle Heat treatment quenching restore spring wire its original properties outside capabilities model ers have tried heating quenching water reharden music wire success does hardenbut brittleness like glass will break easily vicious snap joint must strong resistance bending consider using soft solder over greater area brass steel tube over wire spread load enough wetted area solder along music wire joint reasonable strength can made couple myths about RC Scale models proven incorrect Leeourget Scale World Championships often-heard story about loss radio control metal airplanes now known fiction least modern radio equipment winning deHavilland Drover completely aluminumcovered over balsa base antenna routed outside during its flights seeing metal-covered well complete ly-metal-built models being flown success experience aluminum litho-plate sheeting has used wide areas fuselage ill effects Some old myths die hard about undercambered airfoils being difficult control laid rest LeBourget second-place Avro 504K absolutely Continued page 134 -pLSS~ ISA~GO CUT 1/4 DEEP SLIT ALLR/G TIE FULL LENGTH O THE MATAI/G IGAPFACES Still Using bid Fashioned Wing Hinges will gain control efficiency eliminating gap between moveable stationary control surfacesEASY TO INSTALL will amazed performance gained using simple inexpen-1 sive improvementiFREE MOVEMENT450 STRONG AND LIGHTWEIGHTc~- ASTALL HA/GEUSE COMPLETELY FUELPROOF-2 STRAIGHT PIN TO MAKE COMPATABLE WITH ALL IRON-ONDRIP CYANOALWYLA7E MATERIALSELLE HO ESCAPtLAAT IN CARRY GLUE 4104/6 EN rIPE JOINT COMES IN 3 PT LENGTHS SMALL 118 ORPRICE 3 ft $250-FOR ADD AdS/4L SED39IT1 LARGE 1/43 A/SENT 54ALL PIN EVER FEW NCHES CUT OFF F US/I FLL AND SAND AS dEEDED FOR FIRISHING Send Free Info f ne products FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97115 PO BOX 911 DIDDIflIIETC 916j 36S-6700 ANDERSON CA 96007lbEu write brochure Specializing ZENOAH/MiLONEY/SACHS-DOLMAR Quality EngInes Hd K SUPERSTARTER MK il Fits QUADRAS AND G-38 $2495 Also NowAvailableFor G-62 $2995 ENGINESKITS ZENOAH 0-231/2995SACHS DOLMAR 37 W/MUPFLER529995MODEL TECH KITS ZENOAH 0-381/2495PornO ye/sarI72 CAP 2/ 117995 ZENOAI-I G-62S /9995SACHS DOLMAJI 37 W/MUFFLER04995RIO UGLY STICK 09795 CUSTOM 0-38S 6995Sp/ing Slarter CD IgnitronThese Fantastrc Eeactr-BuiIt CUSTOM 0-38S18995SACHS DO/MAR 52536500Balsa Kits Perfect/or WlSpong Starre/ -W/Sprrog S/PIerMALONEY SE OEO-23 NEW Maloney 100 1 01 Gasoline Engine wlnsufflerS12995. Replace balky alcohol burnbig mess making prop spitting dead stIck landIng 4 cycle 120 wIth MALONEY 100 Easy startIng reliable economIcal 108 mention cleaner less expensive PIROPSIZharI DHESIVES IPKi /8o6-10/895201 sLOW CA$595 1808-145&95200 IMI CA/595 2006-IS$10955 MIN EPOXY/S ozlS650 20/8-1411095SM/N EPOXY /9 oa/SESO 22o6-I0S 109530 MIN EPOXY/S oziS/SO Add U SOfa UPs Handtto9 eac/t order COO addoonat U SO Ktts add /75/to UPS VI5AIMC now accepted Pttcestubjeot change wrtrout THE STANDARD CONTACT ADHESIVE FOR SHEETING FOAM WINGS WILL NOT ATTACK STYROFOAM CORES MIScELLANEOuS CR 14 5CAIO TAIL WHEEL5/395 NOR POWERPLUG5250 ASISOIL 00-I OIL/290 WORLD 5-16/FLSTARA//2495 0-38 MOUNT/1795 C R5PINNER5/-30%/ WORLD TM /WHITE/5695 SOUTHERNS SORGHUM & FLEXALL PLASTICIZER FOR ACRYLICS AND DOPES STOPS CRACKING AND CHIPPING SEE YOUR DEALER OR DISTRIBUTOR DAVE BROWN PRODUCTS 4560 Layhigh Hamilton OH 45013 513 738-1576 July1986 43 GAPLESS HiNGE SLOTTER Simplifies installation Gapless Hinges Makes Slots 4 Sizes 01 Balsa IG I5 RICE $250 OUADRA 82 /1 ONLYI 525995 Two channel wheel radio unbeatable performance Servo reversing & end point adjustments both channels Continuously adjustable steering rate Adjustable steering wheel tension lncludes receiver switch harness battery holder Comes withwo JRS5O5 servos Available 2TMHz 9fLV An extremely reliable radio Two channel system cars boats lncludes battery case drycells receiver two JRS5O5 servos Available 27 MHz BOTH RADIOS ARE COVERED BY CIRCUS HOBBIES WARRANTY TAKE ADVANTAGE OF OUR ERROR AND SAVE WHILE SUPPLIES LAST PRICES SUBJECT TO CHANGE TED TO QUANTITY ON HAND CALL TOLL FREE NOW TO PLACE YOUR ORDER 800 782-0022 3132 S HIGHLAND DRIVE VEGAS NEVADA 89109 Radio Technique/Myers Continued page 131 tones pocket pager will almost always sound mushy AM perfectly clear FM Contact District Frequency Coordina tor information loan scanner name will found AMA News sec tion right under District VPs name picture dont know what district Look state listed above VP col umns AMA News George M Myers 70 Froehlich Farm Rd HicksvIIe NY 11801 Good-Bad/Layers Continued page 40 weight behind hinges greater problem becomes Ailerons seem especially susceptible Invest tough heavy materials areas take control surface stresses hinge points control horn mountings Keep rest structure light possible Static dynamic balancing topics another time selecting wood construction gen erally speaking high-density wood tougher heavier low-density wood weaker lighter Select wood its purpose regarding strength weight ailerons mentioned before prefer high-density wood sub-spar mounts hinges low-density trailing edge reduce weight aft hinge line Analyze structure youre building take time select proper materials Lets talk about covering may Strohs man happen MonoKote man covering planes past always felt type covering added undue amount weight pleased find covering accounted 5Yi% total weight came 9 oz5 wing 2 fuselage 1 tail Considering MonoKotes toughness great finish considerable amount strength adds built-up structures think terrific investment weight fact bargain havent tried everything shop around check manufacturers spec sheets weight conscious well color con scious about nice-to-have dontreally-need items some planes lug around plane have exhaust pipe extension keep plane little cleaner C-size onboard booster NiCd convenience Theyre nice have add 3 oz plane may have gone overboard first couple planes used tubular nylon pushrods soon convinced expansion contraction tem perature changes wanted put up Since Ive used hardwood dowel pushrods logic telling larger plane larger dowel should Too late correct now estimate four-dowel pushrods Y16 dia threaded rod ends weigh little dds up Ill have rethink last point wed best close hangar doors Design own planes Think youve got some neat ideas Well think huge windshield neat weighs about 2 oz Doesnt sound bad until call eighth pound thats weightand thats name game See Sunday RC Scale/Wischers Continued page 43 stable air course lack wind during its flights helped model its high placing scoring bonus undercam bered airfoil now debatable subject FAI rules real reason problems such wing its inherent weakness same true very thin wings biplane Shallow depth spars requires made hardwood wire interstrut bracing becomes truly functional Muffler pressure Reliable muffler pressure fuel tank necessity reducing change fuel flow between full emp ty tank have used silicone rubber tube tank filling plugged after filling seal against pressure loss plug prefer machine screw Too coarse thread 134 Model Aviation - sent us tne wrong oraer ana over stocke radios leading sellers Japan identical er 2 Circus 2 radios except label price ALPINAZ BEAT 2 STICK RADIO 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! 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