Radio Control Scale Bob Dolly Wischer PIANO HINGE ubiquitous piano hinge used aircraft cowl hatch hinge joints used good reason affords very secure hinge arrangement light weight adaptability Its real drawback its inability follow curved line see piano hinge assured no compound curves cowl Description piano hinge con tinuation interleaving hinge points long wire passing through segments can length have seen models operational piano hinges some quite well-made considering fact modeler produced handwork small models however problem Scale appearance lost due difficulty obtaining true dimensions diameterand especially spacing between hinge segments own best efforts have direction reasonable simulaton always flattered someone asks source assumption commercial item purchase model scale range /8 use easily obtainable /16-in aluminum tube hobby shop add grooves regular spacing simulate joints piano hinge grooves can made rolling tube beneath single-edge razor blade requires very deft touch extreme care avoid inadvertently cutting directly through tube best system have found impressing grooves lathe tube gripped three-jaw chuck X-Acto razor saw held gently against tube close possible jaws course means lathe must stopped started groove tube moved progressively outward Lacking lathe another method applying grooves V-groove cut length hardwood block produce V groove setting circular saw blade 450 angle blade extending about 045 050 above table top Later alu minum tube laid groove cant escape being twirled under single-edge razor blade X-Acto razor saw Again light touch needed avoid making small pieces now have length aluminum tube has become quite fragile flexible applied model setting hollow formed between adjacent cowl plates can used directly gluing place flexible cement such Wilhold R/C 56 tube fastened outer surface cowl no hollow exists illusion piano hinge lost because tube stands too high remedy situation return tube hardwood V-block file away side obtain flat surface gluing best appear ance remove aluminum file comes close breaking through tubes inside diameter Only tiny amount R/C 56 used fasten tube place Remove excess glue sharp toothpick knife blade glue dries clear somewhat rubbery use R/C 56 fasten aluminum metalwork balsa plywood substructure models never joint failure fact metal bent useless shape tries remove afterward Cowl latch photo showing piano hinge cowl Douglas Mailplane note two protrusions top larger simu lates carburetor air intake prototypes Liberty V-12 engine smaller bent tube opening facing forward simulating vent Libertys oil tank model de cided tube could used operator cowl hold-down latch operator actually short length 3A2-in music wire bent sharply 900 its square-cut end painted flat black simulate open-ended tube Rotating operator 9fl0 turns brass plate sol dered its inner end pulls two /16-in music wire latches inward release cowl closeup details Bobs new Douglas M5liPl5fl Birdcage metal brace wires CL suspect culprits Tar RF-noisecausea radio glitch problems droplet solder crossover point cabane wires quieted some static noise Simulated piano hinge R crest cowl actually grooved aluminum tube Note simulated vent tube located just aft scale carburetor air intake vent tube actually piece music wire upper end cowl-latch actuator 46 Model Aviation Dan Molinos clipped-wing Cub Above began Big kit An OS Gemini 120 twin four-stroker powers Weight isi 3 lb Finish Big dope over Super Coverite Charlip Nelsons scratch-built Waco VKS-7F R uses 05 90 four-stroke power Scale 225 ln/ft span 784 weight 14 lb Finish Randolph dope over Koverail Both models seen Mint Julep contest wire ends hook beneath small hardwood blocks fastened cowl sides models engine first run cowl place immediately observed operator moving unlatched posi tion due engine vibration safety-pin-type spring added has over-center oper ation tends remain either latched unlatched positions convinced out spring cowl would have departed first flight Note intemal wood brace simply glued aluminum cowls interior sur face again using R/C 56 After dozen flights cowl remains secure Glitch problems Douglas Mailplane truly flying bird-cage 28 streamlined steel rigging wires between wings steel cabane landing gear struts six steel cables tail surfaces music wire pushrods ailerons steel brace wires tail surfaces addition aluminum plates simulate fuel tanks both wings metal fuselage top cowl sides bottom receiver antenna runs rearward through fuselage bottom parallel con trol cables spite potential trouble RF interference early flights reason ably successful its first contest Mint Julep May Continued page 137 PRECISION Hawker Hurricane MK lic $14950 Wing Span 62 inch Weight 61/2 81/2 lbs depends flaps retracts Full Scale Detail includes 5 view flaps retracts setup Engine 65-90 FS 60 TS Fiberglass cowl Aero-Pacer $8900 Sport-Trainer Wing Span 641/2 inch Weight 5-7 Ibs Wing load 19-25 oz Engine 45-65 ES 29-45 TS Easily converted tail dragger flaps Video construction tape available Baby-Pacer $5950 Versatile small size Wing Span 50 inch Weight 25-35 Ibs Wing load 19-25 oz Engine 15-40 FS 19-25 TS ELECTRIC 4 HANDCUT SELECTED BALSA AND HARDWOOD PARTS. ALL WITH MADE IN USA QUALITY DH6O Gipsy Moth $10900 Wing Span 541/4 inch Weight 5-6 Ib Wing Load 15 oz Engine 45-65 ES 35-SO TS Flybaby 2 1 Combo Flybaby $7950 Bipe $9500 Combo $11000 Wing Span 56 44 inches Weight 4-5 lbs Wing Load 22 14 oz Engine 30-45 ES 25-40 TS AT FIELD CONVERSION 10 MI N ONLY $6996 * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $225 Cat No 202 Air Cleaner Fine $225 Replacement Inserts Cat No 104 PkI2 Inserts Coarse $195 Cat No204 PkI2 Inserts Fine $195 FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 SAFETY STARTING September 1987 47 Simple cowl latch Bobs Mailpiane has lever retracts two hold-down pIns safety-pin-type spring locksthe latch pins closed position VISA Mastercard COD money order Add $550 Post Handling Mich residents add 4% Wdeo Catalog $1000 Beta VHS $5 rebate order Cowls either ABS Fiberglass Plan Packs Available Making simulated piano hinges V-notch hardwood block used hold aluminum tube being grooved file later flat filed sideto provideagoodsurfaceforglulng hinge model structure -r-14Qit0 AERODROME MODELS LTD-----\MODELSLTo/ 2623 S MILLER RD SAGINAW MI 48603 517 781-3000 4 OPTIMIZE YOUR ENGINES OUTPUT TATONES THRUST TESTER #7rvvYN~TATONE 30-13 Use TATONES. ALUM MOTOR MOUNT THRUST TESTER determine maximum output usingENGINE engineTHROTTLE differentCONTROL props fuel mixtures RPM levels Check engineDIRECT READI NGA ST DIAL RC Scale/Wischers Continued page 47 model encountered series elevator aileron glitches threatened destruction remembered first Douglas built 17 years previously similar prohlems solu tion solder points pairs cabane wires crossed about other wires case wires terminated wood did touch adjacent wires bellcranks control cables made plywood Only cabane brace wire ends fastened metal meet 5A2-in music wire struts Vibrating metal prime source RF interference single-cylinder four-stroke en gines vibrate early flights made dummy pilot cockpit contest pilots presence necessity because dras tic loss realism points during flight dummy isnt present could plastic dummy pilot cause electrical noise near-disastrous flight close examination re vealed likely reason Williams Bros plastic pilot figure mounted strip springy aluminum could snapped place flights quickly removed static judging ends aluminum strip pressed against interior aluminum cockpit cowling engine vibration could rub metal against metal light pressure came con clusion really asking trouble Insulating tubing now glued mounting strip ends electrically isolate contact cowl Only Scale modelers unorthodox building methods materials susceptible built-in problems brings mind sign saw EAA Oshkosh convention depar ture point full-size aircraft succinctly wams DONT DO NOTHING DUMB Bad gram mar effective problem would have re peated next flight whenever dummy pilot replaced Servo size reader asks information selection servo sizes Scale models question facets answer because wide variation airplane type readers basic concem came about because label attached model indicating quarterscale him meant large size prob able need high-energy servos term quarter-scale very misleading small pro totype aircraft A-scale could small model servos needed flight controls can standard types output torque 30to 40-in-oz range would normally expected such model would have weight less 15 lb Weight speed Scale model factors determine necessary servo output torque Scale ratio has little effect servo size very active aerobatic-type model large control sur faces moving stop stop would obviously need servos greater output have flown 14-lb model using Ace Bantam Midget servos having 18 in-oz torque model definitely non-acrobatic type no great demands placed servos aero batic type weight range up 15 lb servos output torque 35- 45-in-oz should job heavyweight models above 20 lb use either largest servos two regular ones parallel Ailerons elevators large models up 15 lb control surfaces greatest area controls likely overburden weak servo have noticed definite tendency elevators unable deflect fully during dive after such maneuvers recovery spin split-S Because large size elevators amount deflection actually visible ground can see reduced motion during pull-out after maneuvers reduction noticeable throttle open prop slipstream adding elevators burden other words need altitude safely pull out dive throttle open 38-in-oz servo would prob ably considered marginal elevator However same airplane never flown aerobatically such servo size would adequate Basic differences outputs various servos can traced motor size Practically modem servos use motor 16mm diameter dimension determining factor servo extemal dimensions servos have output 40-in-oz range large models intended fast flight violent maneuversa servo such Ace Atlas pre ferred Atlas conservatively rated 45 in-oz uses 20mm diameter motor indicates larger case size need 600 mAb batteries avoid long pushrods ailerons some mod elers using two servos aileron use two servos parallel elevators also has merit course drain batteries increased 600 800 mAh should used particularly flights long Continued page 140 u [liii W U wiri H To NOSTALG-Air PO Box 8510 Michigan City Indiana 46360 September 1987 137 SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane %fl PRECISION PRODUCTS INC 714 592-5144 L 510 E Arrow Highway San Dimas CA 91773 SEND $300 12 page catalog Ii 47 Planes Prints Frames Mats Three indispensable references for only modelers . shown Two largevolumes Appros 800 photos newcolor Large format 300 plus photos nearly 100 detailed shots US $60 2 4 large color prints aces 3-views US$40 including post beautiful wall chart aircraft Bank authorized check MO please color Bank authorized check MO please NOTE For complete color catalog please send 2 International Reply Coupons Ask post office KOOKABURRA TECHNICAL PUBLICATIONS Pty Ltd P0 Box 648 Dandenong 3175 Victoria Australia 1 TRIM KNIFE Trim Knife designed precisely edge trim excess cover ing material model Can used outside edges straight curved Blade can set trom 1/16 1/4 simple adlustment screw Trim Knife mill make perfect overlap ous seams Works witn cover ig materials 6 blades Trim Knife Set includes 6 blades $900 Trim Knife Blades 5 per pack $300 m -IA No Notches Straight Cuts Heavy duty estra sharp no notch blade Same sice regular blades tip does flex cusing strip png thicker materials Great big birds Big Bird Blades box 100 blades$950 Trial size package 20 blades$250 RC Scale/Wischers Continued page 137 flights between charges Heavy flight loads single servo also place extra drain batteries Hobbypoxy colors Pettit Paint Co manufac turers Hobbypoxy products has published mulas mixing colors used contemporary Israeli Air Force aircraft colors Pale Green FS-34227 Tan FS-30219 Sand FS-33531 Light Gray FS-36622 Two colors Tan Light Gray same used contemporary USAF aircraft published column earlier formulas Light Gray 12 parts HIO White five parts H55 Cream two parts H70 Gray Tan five parts H65 Bright Red three parts HIO White two parts H49 Cub Yellow part H70 Gray part H81 Black Pale Green II parts H70 Gray seven parts H47 Bright Yellow part H24 Dark Blue part H Ifi White part H57 Bright Orange Sand 14 parts H55 Cream two parts H70 Gray part H65 Bright Red part HIO White Bob Dolly Wiseher 5-22] Lapham Peak Rd Delafield WI 530 J8 RC Old-Timers/Mathews Continued page 49 ials Lake Rocket City now Sig sure easy install particularly strip stock like use Old-Timers need cut slot wood knife slide hinge dry flow thin CyA glue seam bit stiff like Old-Timers control surface air loads usually low control inputs infrequent additional battery drain due stiff hinges likely insignificant Finally note some amusement other Old-Timer columnists another pub lication challenges us report onand take stand aboutthe raging dispute hassle over SAM Society Antique Modelers RC competition rules will compete national level primarily due sort hostility competition tends create what otherwise nice people included fore express own opinions would totally unfair intent column influence opinion rather create interest fascinating aspect hobby chronicle its history hope various sundry warring parties will soon recognize damage such attitudes doing will get back basic function recreational activity. enjoy what Its worth Ive spent last eight months developing ELT entry-level trainer trying combine aerodynamic parameters Old-Timer easier construction techniques contemporary design Talk about challenge sixth revision currently flying both OS 20 four-stroker K&B 20 Sportster two-stroker results develop ment flying perhaps significant worth comment friend flying site recently called attention OS four-stroker aw first Surpass series though advertised such correct Just take look bubbles head covers. high-lift cams forth have obviously used Further switching engines produces virtually no difference linear velocity models flight Conclusion least instance 20 four-stroker right 20 twostroker Dee B Mathews 909 Maize Rd Townhouse 734 Wichita KS 87212 RC Giant Scale/de Vries Continued page 51 ignitionone can reached safely outside model Im suggesting yet another servo-operated kill switch What Im saying safety redundancy manual switch such positive factors such switches should used much universally now subject good friend Ed Carrol suggested rather simple effective idea redundif transmitter adding couple wires plug switch Ed has dual-battened Krafts Futabas hes flown several times during day simple flip switch gives him freshly charged battery transmitter hes off two-day weekend Giant rally really doesnt have worry about having stay motel recharge trans mitter actual use Ed has stuck extra set transmitter batteries back case some Velcro doesnt look sexy system works like gangbusters have give credit inspiration column newfound friend John P Violette LaPlace LA Johns magnificent B-17G model appears months effort rather exten sive correspondence John fully documented history prototype Fortress Con gressional Medals Honor awarded its crewand developed what amounts complete history well Boeings letter Charles 0 Brown 8101 Sonar Rl Clinton MD 20735 Charlies gone route trying document specific Grumman Bearcat has come up empty Any out can provide photos anything concerned F8F-2 civilian llcense number N7700C flown air shows Bill Fornoff se drop Charlie line know Dan Lutz will happy see Boeing F4B-2 months column Since Dans picture know hes recovered its just physical recovery either since hes back workshop first met Dan gave SO-cent tour Kraft factory like fivebuck tour about 10 years ago Emil Agosta Dry Ridge Models 59 McCurry RdWeavervilleNC28787isatitagain Back designing beautiful Giant models latest J-4 Sportster -scale has span 114 1824 sq wing area Itll powered OS Max 91 FSR bones weigh tad under seven pounds guessti mate radio engine covering ultralight Scale model will top out between 12 13 lb prototype model flown Emil will probably offer drawings maybe kit Bill Hannans done another onel Volume 2 Intern ational Peanuts & Pistachios out 140 Model Aviation INTERCEPTOR Ready Fly $695 U build Kit $4 95 Note Please odd $3 P & H 1st 3 models Add tO % price additional model COMPANY PO Box 68132 Portland OR 97268 Fokker D-VII VK Model Aircraft PO Box 3007 Aurora IL 60505 312-357-1883
Edition: Model Aviation - 1987/09
Page Numbers: 46, 47, 137, 140
Radio Control Scale Bob Dolly Wischer PIANO HINGE ubiquitous piano hinge used aircraft cowl hatch hinge joints used good reason affords very secure hinge arrangement light weight adaptability Its real drawback its inability follow curved line see piano hinge assured no compound curves cowl Description piano hinge con tinuation interleaving hinge points long wire passing through segments can length have seen models operational piano hinges some quite well-made considering fact modeler produced handwork small models however problem Scale appearance lost due difficulty obtaining true dimensions diameterand especially spacing between hinge segments own best efforts have direction reasonable simulaton always flattered someone asks source assumption commercial item purchase model scale range /8 use easily obtainable /16-in aluminum tube hobby shop add grooves regular spacing simulate joints piano hinge grooves can made rolling tube beneath single-edge razor blade requires very deft touch extreme care avoid inadvertently cutting directly through tube best system have found impressing grooves lathe tube gripped three-jaw chuck X-Acto razor saw held gently against tube close possible jaws course means lathe must stopped started groove tube moved progressively outward Lacking lathe another method applying grooves V-groove cut length hardwood block produce V groove setting circular saw blade 450 angle blade extending about 045 050 above table top Later alu minum tube laid groove cant escape being twirled under single-edge razor blade X-Acto razor saw Again light touch needed avoid making small pieces now have length aluminum tube has become quite fragile flexible applied model setting hollow formed between adjacent cowl plates can used directly gluing place flexible cement such Wilhold R/C 56 tube fastened outer surface cowl no hollow exists illusion piano hinge lost because tube stands too high remedy situation return tube hardwood V-block file away side obtain flat surface gluing best appear ance remove aluminum file comes close breaking through tubes inside diameter Only tiny amount R/C 56 used fasten tube place Remove excess glue sharp toothpick knife blade glue dries clear somewhat rubbery use R/C 56 fasten aluminum metalwork balsa plywood substructure models never joint failure fact metal bent useless shape tries remove afterward Cowl latch photo showing piano hinge cowl Douglas Mailplane note two protrusions top larger simu lates carburetor air intake prototypes Liberty V-12 engine smaller bent tube opening facing forward simulating vent Libertys oil tank model de cided tube could used operator cowl hold-down latch operator actually short length 3A2-in music wire bent sharply 900 its square-cut end painted flat black simulate open-ended tube Rotating operator 9fl0 turns brass plate sol dered its inner end pulls two /16-in music wire latches inward release cowl closeup details Bobs new Douglas M5liPl5fl Birdcage metal brace wires CL suspect culprits Tar RF-noisecausea radio glitch problems droplet solder crossover point cabane wires quieted some static noise Simulated piano hinge R crest cowl actually grooved aluminum tube Note simulated vent tube located just aft scale carburetor air intake vent tube actually piece music wire upper end cowl-latch actuator 46 Model Aviation Dan Molinos clipped-wing Cub Above began Big kit An OS Gemini 120 twin four-stroker powers Weight isi 3 lb Finish Big dope over Super Coverite Charlip Nelsons scratch-built Waco VKS-7F R uses 05 90 four-stroke power Scale 225 ln/ft span 784 weight 14 lb Finish Randolph dope over Koverail Both models seen Mint Julep contest wire ends hook beneath small hardwood blocks fastened cowl sides models engine first run cowl place immediately observed operator moving unlatched posi tion due engine vibration safety-pin-type spring added has over-center oper ation tends remain either latched unlatched positions convinced out spring cowl would have departed first flight Note intemal wood brace simply glued aluminum cowls interior sur face again using R/C 56 After dozen flights cowl remains secure Glitch problems Douglas Mailplane truly flying bird-cage 28 streamlined steel rigging wires between wings steel cabane landing gear struts six steel cables tail surfaces music wire pushrods ailerons steel brace wires tail surfaces addition aluminum plates simulate fuel tanks both wings metal fuselage top cowl sides bottom receiver antenna runs rearward through fuselage bottom parallel con trol cables spite potential trouble RF interference early flights reason ably successful its first contest Mint Julep May Continued page 137 PRECISION Hawker Hurricane MK lic $14950 Wing Span 62 inch Weight 61/2 81/2 lbs depends flaps retracts Full Scale Detail includes 5 view flaps retracts setup Engine 65-90 FS 60 TS Fiberglass cowl Aero-Pacer $8900 Sport-Trainer Wing Span 641/2 inch Weight 5-7 Ibs Wing load 19-25 oz Engine 45-65 ES 29-45 TS Easily converted tail dragger flaps Video construction tape available Baby-Pacer $5950 Versatile small size Wing Span 50 inch Weight 25-35 Ibs Wing load 19-25 oz Engine 15-40 FS 19-25 TS ELECTRIC 4 HANDCUT SELECTED BALSA AND HARDWOOD PARTS. ALL WITH MADE IN USA QUALITY DH6O Gipsy Moth $10900 Wing Span 541/4 inch Weight 5-6 Ib Wing Load 15 oz Engine 45-65 ES 35-SO TS Flybaby 2 1 Combo Flybaby $7950 Bipe $9500 Combo $11000 Wing Span 56 44 inches Weight 4-5 lbs Wing Load 22 14 oz Engine 30-45 ES 25-40 TS AT FIELD CONVERSION 10 MI N ONLY $6996 * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $225 Cat No 202 Air Cleaner Fine $225 Replacement Inserts Cat No 104 PkI2 Inserts Coarse $195 Cat No204 PkI2 Inserts Fine $195 FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 SAFETY STARTING September 1987 47 Simple cowl latch Bobs Mailpiane has lever retracts two hold-down pIns safety-pin-type spring locksthe latch pins closed position VISA Mastercard COD money order Add $550 Post Handling Mich residents add 4% Wdeo Catalog $1000 Beta VHS $5 rebate order Cowls either ABS Fiberglass Plan Packs Available Making simulated piano hinges V-notch hardwood block used hold aluminum tube being grooved file later flat filed sideto provideagoodsurfaceforglulng hinge model structure -r-14Qit0 AERODROME MODELS LTD-----\MODELSLTo/ 2623 S MILLER RD SAGINAW MI 48603 517 781-3000 4 OPTIMIZE YOUR ENGINES OUTPUT TATONES THRUST TESTER #7rvvYN~TATONE 30-13 Use TATONES. ALUM MOTOR MOUNT THRUST TESTER determine maximum output usingENGINE engineTHROTTLE differentCONTROL props fuel mixtures RPM levels Check engineDIRECT READI NGA ST DIAL RC Scale/Wischers Continued page 47 model encountered series elevator aileron glitches threatened destruction remembered first Douglas built 17 years previously similar prohlems solu tion solder points pairs cabane wires crossed about other wires case wires terminated wood did touch adjacent wires bellcranks control cables made plywood Only cabane brace wire ends fastened metal meet 5A2-in music wire struts Vibrating metal prime source RF interference single-cylinder four-stroke en gines vibrate early flights made dummy pilot cockpit contest pilots presence necessity because dras tic loss realism points during flight dummy isnt present could plastic dummy pilot cause electrical noise near-disastrous flight close examination re vealed likely reason Williams Bros plastic pilot figure mounted strip springy aluminum could snapped place flights quickly removed static judging ends aluminum strip pressed against interior aluminum cockpit cowling engine vibration could rub metal against metal light pressure came con clusion really asking trouble Insulating tubing now glued mounting strip ends electrically isolate contact cowl Only Scale modelers unorthodox building methods materials susceptible built-in problems brings mind sign saw EAA Oshkosh convention depar ture point full-size aircraft succinctly wams DONT DO NOTHING DUMB Bad gram mar effective problem would have re peated next flight whenever dummy pilot replaced Servo size reader asks information selection servo sizes Scale models question facets answer because wide variation airplane type readers basic concem came about because label attached model indicating quarterscale him meant large size prob able need high-energy servos term quarter-scale very misleading small pro totype aircraft A-scale could small model servos needed flight controls can standard types output torque 30to 40-in-oz range would normally expected such model would have weight less 15 lb Weight speed Scale model factors determine necessary servo output torque Scale ratio has little effect servo size very active aerobatic-type model large control sur faces moving stop stop would obviously need servos greater output have flown 14-lb model using Ace Bantam Midget servos having 18 in-oz torque model definitely non-acrobatic type no great demands placed servos aero batic type weight range up 15 lb servos output torque 35- 45-in-oz should job heavyweight models above 20 lb use either largest servos two regular ones parallel Ailerons elevators large models up 15 lb control surfaces greatest area controls likely overburden weak servo have noticed definite tendency elevators unable deflect fully during dive after such maneuvers recovery spin split-S Because large size elevators amount deflection actually visible ground can see reduced motion during pull-out after maneuvers reduction noticeable throttle open prop slipstream adding elevators burden other words need altitude safely pull out dive throttle open 38-in-oz servo would prob ably considered marginal elevator However same airplane never flown aerobatically such servo size would adequate Basic differences outputs various servos can traced motor size Practically modem servos use motor 16mm diameter dimension determining factor servo extemal dimensions servos have output 40-in-oz range large models intended fast flight violent maneuversa servo such Ace Atlas pre ferred Atlas conservatively rated 45 in-oz uses 20mm diameter motor indicates larger case size need 600 mAb batteries avoid long pushrods ailerons some mod elers using two servos aileron use two servos parallel elevators also has merit course drain batteries increased 600 800 mAh should used particularly flights long Continued page 140 u [liii W U wiri H To NOSTALG-Air PO Box 8510 Michigan City Indiana 46360 September 1987 137 SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane %fl PRECISION PRODUCTS INC 714 592-5144 L 510 E Arrow Highway San Dimas CA 91773 SEND $300 12 page catalog Ii 47 Planes Prints Frames Mats Three indispensable references for only modelers . shown Two largevolumes Appros 800 photos newcolor Large format 300 plus photos nearly 100 detailed shots US $60 2 4 large color prints aces 3-views US$40 including post beautiful wall chart aircraft Bank authorized check MO please color Bank authorized check MO please NOTE For complete color catalog please send 2 International Reply Coupons Ask post office KOOKABURRA TECHNICAL PUBLICATIONS Pty Ltd P0 Box 648 Dandenong 3175 Victoria Australia 1 TRIM KNIFE Trim Knife designed precisely edge trim excess cover ing material model Can used outside edges straight curved Blade can set trom 1/16 1/4 simple adlustment screw Trim Knife mill make perfect overlap ous seams Works witn cover ig materials 6 blades Trim Knife Set includes 6 blades $900 Trim Knife Blades 5 per pack $300 m -IA No Notches Straight Cuts Heavy duty estra sharp no notch blade Same sice regular blades tip does flex cusing strip png thicker materials Great big birds Big Bird Blades box 100 blades$950 Trial size package 20 blades$250 RC Scale/Wischers Continued page 137 flights between charges Heavy flight loads single servo also place extra drain batteries Hobbypoxy colors Pettit Paint Co manufac turers Hobbypoxy products has published mulas mixing colors used contemporary Israeli Air Force aircraft colors Pale Green FS-34227 Tan FS-30219 Sand FS-33531 Light Gray FS-36622 Two colors Tan Light Gray same used contemporary USAF aircraft published column earlier formulas Light Gray 12 parts HIO White five parts H55 Cream two parts H70 Gray Tan five parts H65 Bright Red three parts HIO White two parts H49 Cub Yellow part H70 Gray part H81 Black Pale Green II parts H70 Gray seven parts H47 Bright Yellow part H24 Dark Blue part H Ifi White part H57 Bright Orange Sand 14 parts H55 Cream two parts H70 Gray part H65 Bright Red part HIO White Bob Dolly Wiseher 5-22] Lapham Peak Rd Delafield WI 530 J8 RC Old-Timers/Mathews Continued page 49 ials Lake Rocket City now Sig sure easy install particularly strip stock like use Old-Timers need cut slot wood knife slide hinge dry flow thin CyA glue seam bit stiff like Old-Timers control surface air loads usually low control inputs infrequent additional battery drain due stiff hinges likely insignificant Finally note some amusement other Old-Timer columnists another pub lication challenges us report onand take stand aboutthe raging dispute hassle over SAM Society Antique Modelers RC competition rules will compete national level primarily due sort hostility competition tends create what otherwise nice people included fore express own opinions would totally unfair intent column influence opinion rather create interest fascinating aspect hobby chronicle its history hope various sundry warring parties will soon recognize damage such attitudes doing will get back basic function recreational activity. enjoy what Its worth Ive spent last eight months developing ELT entry-level trainer trying combine aerodynamic parameters Old-Timer easier construction techniques contemporary design Talk about challenge sixth revision currently flying both OS 20 four-stroker K&B 20 Sportster two-stroker results develop ment flying perhaps significant worth comment friend flying site recently called attention OS four-stroker aw first Surpass series though advertised such correct Just take look bubbles head covers. high-lift cams forth have obviously used Further switching engines produces virtually no difference linear velocity models flight Conclusion least instance 20 four-stroker right 20 twostroker Dee B Mathews 909 Maize Rd Townhouse 734 Wichita KS 87212 RC Giant Scale/de Vries Continued page 51 ignitionone can reached safely outside model Im suggesting yet another servo-operated kill switch What Im saying safety redundancy manual switch such positive factors such switches should used much universally now subject good friend Ed Carrol suggested rather simple effective idea redundif transmitter adding couple wires plug switch Ed has dual-battened Krafts Futabas hes flown several times during day simple flip switch gives him freshly charged battery transmitter hes off two-day weekend Giant rally really doesnt have worry about having stay motel recharge trans mitter actual use Ed has stuck extra set transmitter batteries back case some Velcro doesnt look sexy system works like gangbusters have give credit inspiration column newfound friend John P Violette LaPlace LA Johns magnificent B-17G model appears months effort rather exten sive correspondence John fully documented history prototype Fortress Con gressional Medals Honor awarded its crewand developed what amounts complete history well Boeings letter Charles 0 Brown 8101 Sonar Rl Clinton MD 20735 Charlies gone route trying document specific Grumman Bearcat has come up empty Any out can provide photos anything concerned F8F-2 civilian llcense number N7700C flown air shows Bill Fornoff se drop Charlie line know Dan Lutz will happy see Boeing F4B-2 months column Since Dans picture know hes recovered its just physical recovery either since hes back workshop first met Dan gave SO-cent tour Kraft factory like fivebuck tour about 10 years ago Emil Agosta Dry Ridge Models 59 McCurry RdWeavervilleNC28787isatitagain Back designing beautiful Giant models latest J-4 Sportster -scale has span 114 1824 sq wing area Itll powered OS Max 91 FSR bones weigh tad under seven pounds guessti mate radio engine covering ultralight Scale model will top out between 12 13 lb prototype model flown Emil will probably offer drawings maybe kit Bill Hannans done another onel Volume 2 Intern ational Peanuts & Pistachios out 140 Model Aviation INTERCEPTOR Ready Fly $695 U build Kit $4 95 Note Please odd $3 P & H 1st 3 models Add tO % price additional model COMPANY PO Box 68132 Portland OR 97268 Fokker D-VII VK Model Aircraft PO Box 3007 Aurora IL 60505 312-357-1883
Edition: Model Aviation - 1987/09
Page Numbers: 46, 47, 137, 140
Radio Control Scale Bob Dolly Wischer PIANO HINGE ubiquitous piano hinge used aircraft cowl hatch hinge joints used good reason affords very secure hinge arrangement light weight adaptability Its real drawback its inability follow curved line see piano hinge assured no compound curves cowl Description piano hinge con tinuation interleaving hinge points long wire passing through segments can length have seen models operational piano hinges some quite well-made considering fact modeler produced handwork small models however problem Scale appearance lost due difficulty obtaining true dimensions diameterand especially spacing between hinge segments own best efforts have direction reasonable simulaton always flattered someone asks source assumption commercial item purchase model scale range /8 use easily obtainable /16-in aluminum tube hobby shop add grooves regular spacing simulate joints piano hinge grooves can made rolling tube beneath single-edge razor blade requires very deft touch extreme care avoid inadvertently cutting directly through tube best system have found impressing grooves lathe tube gripped three-jaw chuck X-Acto razor saw held gently against tube close possible jaws course means lathe must stopped started groove tube moved progressively outward Lacking lathe another method applying grooves V-groove cut length hardwood block produce V groove setting circular saw blade 450 angle blade extending about 045 050 above table top Later alu minum tube laid groove cant escape being twirled under single-edge razor blade X-Acto razor saw Again light touch needed avoid making small pieces now have length aluminum tube has become quite fragile flexible applied model setting hollow formed between adjacent cowl plates can used directly gluing place flexible cement such Wilhold R/C 56 tube fastened outer surface cowl no hollow exists illusion piano hinge lost because tube stands too high remedy situation return tube hardwood V-block file away side obtain flat surface gluing best appear ance remove aluminum file comes close breaking through tubes inside diameter Only tiny amount R/C 56 used fasten tube place Remove excess glue sharp toothpick knife blade glue dries clear somewhat rubbery use R/C 56 fasten aluminum metalwork balsa plywood substructure models never joint failure fact metal bent useless shape tries remove afterward Cowl latch photo showing piano hinge cowl Douglas Mailplane note two protrusions top larger simu lates carburetor air intake prototypes Liberty V-12 engine smaller bent tube opening facing forward simulating vent Libertys oil tank model de cided tube could used operator cowl hold-down latch operator actually short length 3A2-in music wire bent sharply 900 its square-cut end painted flat black simulate open-ended tube Rotating operator 9fl0 turns brass plate sol dered its inner end pulls two /16-in music wire latches inward release cowl closeup details Bobs new Douglas M5liPl5fl Birdcage metal brace wires CL suspect culprits Tar RF-noisecausea radio glitch problems droplet solder crossover point cabane wires quieted some static noise Simulated piano hinge R crest cowl actually grooved aluminum tube Note simulated vent tube located just aft scale carburetor air intake vent tube actually piece music wire upper end cowl-latch actuator 46 Model Aviation Dan Molinos clipped-wing Cub Above began Big kit An OS Gemini 120 twin four-stroker powers Weight isi 3 lb Finish Big dope over Super Coverite Charlip Nelsons scratch-built Waco VKS-7F R uses 05 90 four-stroke power Scale 225 ln/ft span 784 weight 14 lb Finish Randolph dope over Koverail Both models seen Mint Julep contest wire ends hook beneath small hardwood blocks fastened cowl sides models engine first run cowl place immediately observed operator moving unlatched posi tion due engine vibration safety-pin-type spring added has over-center oper ation tends remain either latched unlatched positions convinced out spring cowl would have departed first flight Note intemal wood brace simply glued aluminum cowls interior sur face again using R/C 56 After dozen flights cowl remains secure Glitch problems Douglas Mailplane truly flying bird-cage 28 streamlined steel rigging wires between wings steel cabane landing gear struts six steel cables tail surfaces music wire pushrods ailerons steel brace wires tail surfaces addition aluminum plates simulate fuel tanks both wings metal fuselage top cowl sides bottom receiver antenna runs rearward through fuselage bottom parallel con trol cables spite potential trouble RF interference early flights reason ably successful its first contest Mint Julep May Continued page 137 PRECISION Hawker Hurricane MK lic $14950 Wing Span 62 inch Weight 61/2 81/2 lbs depends flaps retracts Full Scale Detail includes 5 view flaps retracts setup Engine 65-90 FS 60 TS Fiberglass cowl Aero-Pacer $8900 Sport-Trainer Wing Span 641/2 inch Weight 5-7 Ibs Wing load 19-25 oz Engine 45-65 ES 29-45 TS Easily converted tail dragger flaps Video construction tape available Baby-Pacer $5950 Versatile small size Wing Span 50 inch Weight 25-35 Ibs Wing load 19-25 oz Engine 15-40 FS 19-25 TS ELECTRIC 4 HANDCUT SELECTED BALSA AND HARDWOOD PARTS. ALL WITH MADE IN USA QUALITY DH6O Gipsy Moth $10900 Wing Span 541/4 inch Weight 5-6 Ib Wing Load 15 oz Engine 45-65 ES 35-SO TS Flybaby 2 1 Combo Flybaby $7950 Bipe $9500 Combo $11000 Wing Span 56 44 inches Weight 4-5 lbs Wing Load 22 14 oz Engine 30-45 ES 25-40 TS AT FIELD CONVERSION 10 MI N ONLY $6996 * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $225 Cat No 202 Air Cleaner Fine $225 Replacement Inserts Cat No 104 PkI2 Inserts Coarse $195 Cat No204 PkI2 Inserts Fine $195 FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 SAFETY STARTING September 1987 47 Simple cowl latch Bobs Mailpiane has lever retracts two hold-down pIns safety-pin-type spring locksthe latch pins closed position VISA Mastercard COD money order Add $550 Post Handling Mich residents add 4% Wdeo Catalog $1000 Beta VHS $5 rebate order Cowls either ABS Fiberglass Plan Packs Available Making simulated piano hinges V-notch hardwood block used hold aluminum tube being grooved file later flat filed sideto provideagoodsurfaceforglulng hinge model structure -r-14Qit0 AERODROME MODELS LTD-----\MODELSLTo/ 2623 S MILLER RD SAGINAW MI 48603 517 781-3000 4 OPTIMIZE YOUR ENGINES OUTPUT TATONES THRUST TESTER #7rvvYN~TATONE 30-13 Use TATONES. ALUM MOTOR MOUNT THRUST TESTER determine maximum output usingENGINE engineTHROTTLE differentCONTROL props fuel mixtures RPM levels Check engineDIRECT READI NGA ST DIAL RC Scale/Wischers Continued page 47 model encountered series elevator aileron glitches threatened destruction remembered first Douglas built 17 years previously similar prohlems solu tion solder points pairs cabane wires crossed about other wires case wires terminated wood did touch adjacent wires bellcranks control cables made plywood Only cabane brace wire ends fastened metal meet 5A2-in music wire struts Vibrating metal prime source RF interference single-cylinder four-stroke en gines vibrate early flights made dummy pilot cockpit contest pilots presence necessity because dras tic loss realism points during flight dummy isnt present could plastic dummy pilot cause electrical noise near-disastrous flight close examination re vealed likely reason Williams Bros plastic pilot figure mounted strip springy aluminum could snapped place flights quickly removed static judging ends aluminum strip pressed against interior aluminum cockpit cowling engine vibration could rub metal against metal light pressure came con clusion really asking trouble Insulating tubing now glued mounting strip ends electrically isolate contact cowl Only Scale modelers unorthodox building methods materials susceptible built-in problems brings mind sign saw EAA Oshkosh convention depar ture point full-size aircraft succinctly wams DONT DO NOTHING DUMB Bad gram mar effective problem would have re peated next flight whenever dummy pilot replaced Servo size reader asks information selection servo sizes Scale models question facets answer because wide variation airplane type readers basic concem came about because label attached model indicating quarterscale him meant large size prob able need high-energy servos term quarter-scale very misleading small pro totype aircraft A-scale could small model servos needed flight controls can standard types output torque 30to 40-in-oz range would normally expected such model would have weight less 15 lb Weight speed Scale model factors determine necessary servo output torque Scale ratio has little effect servo size very active aerobatic-type model large control sur faces moving stop stop would obviously need servos greater output have flown 14-lb model using Ace Bantam Midget servos having 18 in-oz torque model definitely non-acrobatic type no great demands placed servos aero batic type weight range up 15 lb servos output torque 35- 45-in-oz should job heavyweight models above 20 lb use either largest servos two regular ones parallel Ailerons elevators large models up 15 lb control surfaces greatest area controls likely overburden weak servo have noticed definite tendency elevators unable deflect fully during dive after such maneuvers recovery spin split-S Because large size elevators amount deflection actually visible ground can see reduced motion during pull-out after maneuvers reduction noticeable throttle open prop slipstream adding elevators burden other words need altitude safely pull out dive throttle open 38-in-oz servo would prob ably considered marginal elevator However same airplane never flown aerobatically such servo size would adequate Basic differences outputs various servos can traced motor size Practically modem servos use motor 16mm diameter dimension determining factor servo extemal dimensions servos have output 40-in-oz range large models intended fast flight violent maneuversa servo such Ace Atlas pre ferred Atlas conservatively rated 45 in-oz uses 20mm diameter motor indicates larger case size need 600 mAb batteries avoid long pushrods ailerons some mod elers using two servos aileron use two servos parallel elevators also has merit course drain batteries increased 600 800 mAh should used particularly flights long Continued page 140 u [liii W U wiri H To NOSTALG-Air PO Box 8510 Michigan City Indiana 46360 September 1987 137 SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane %fl PRECISION PRODUCTS INC 714 592-5144 L 510 E Arrow Highway San Dimas CA 91773 SEND $300 12 page catalog Ii 47 Planes Prints Frames Mats Three indispensable references for only modelers . shown Two largevolumes Appros 800 photos newcolor Large format 300 plus photos nearly 100 detailed shots US $60 2 4 large color prints aces 3-views US$40 including post beautiful wall chart aircraft Bank authorized check MO please color Bank authorized check MO please NOTE For complete color catalog please send 2 International Reply Coupons Ask post office KOOKABURRA TECHNICAL PUBLICATIONS Pty Ltd P0 Box 648 Dandenong 3175 Victoria Australia 1 TRIM KNIFE Trim Knife designed precisely edge trim excess cover ing material model Can used outside edges straight curved Blade can set trom 1/16 1/4 simple adlustment screw Trim Knife mill make perfect overlap ous seams Works witn cover ig materials 6 blades Trim Knife Set includes 6 blades $900 Trim Knife Blades 5 per pack $300 m -IA No Notches Straight Cuts Heavy duty estra sharp no notch blade Same sice regular blades tip does flex cusing strip png thicker materials Great big birds Big Bird Blades box 100 blades$950 Trial size package 20 blades$250 RC Scale/Wischers Continued page 137 flights between charges Heavy flight loads single servo also place extra drain batteries Hobbypoxy colors Pettit Paint Co manufac turers Hobbypoxy products has published mulas mixing colors used contemporary Israeli Air Force aircraft colors Pale Green FS-34227 Tan FS-30219 Sand FS-33531 Light Gray FS-36622 Two colors Tan Light Gray same used contemporary USAF aircraft published column earlier formulas Light Gray 12 parts HIO White five parts H55 Cream two parts H70 Gray Tan five parts H65 Bright Red three parts HIO White two parts H49 Cub Yellow part H70 Gray part H81 Black Pale Green II parts H70 Gray seven parts H47 Bright Yellow part H24 Dark Blue part H Ifi White part H57 Bright Orange Sand 14 parts H55 Cream two parts H70 Gray part H65 Bright Red part HIO White Bob Dolly Wiseher 5-22] Lapham Peak Rd Delafield WI 530 J8 RC Old-Timers/Mathews Continued page 49 ials Lake Rocket City now Sig sure easy install particularly strip stock like use Old-Timers need cut slot wood knife slide hinge dry flow thin CyA glue seam bit stiff like Old-Timers control surface air loads usually low control inputs infrequent additional battery drain due stiff hinges likely insignificant Finally note some amusement other Old-Timer columnists another pub lication challenges us report onand take stand aboutthe raging dispute hassle over SAM Society Antique Modelers RC competition rules will compete national level primarily due sort hostility competition tends create what otherwise nice people included fore express own opinions would totally unfair intent column influence opinion rather create interest fascinating aspect hobby chronicle its history hope various sundry warring parties will soon recognize damage such attitudes doing will get back basic function recreational activity. enjoy what Its worth Ive spent last eight months developing ELT entry-level trainer trying combine aerodynamic parameters Old-Timer easier construction techniques contemporary design Talk about challenge sixth revision currently flying both OS 20 four-stroker K&B 20 Sportster two-stroker results develop ment flying perhaps significant worth comment friend flying site recently called attention OS four-stroker aw first Surpass series though advertised such correct Just take look bubbles head covers. high-lift cams forth have obviously used Further switching engines produces virtually no difference linear velocity models flight Conclusion least instance 20 four-stroker right 20 twostroker Dee B Mathews 909 Maize Rd Townhouse 734 Wichita KS 87212 RC Giant Scale/de Vries Continued page 51 ignitionone can reached safely outside model Im suggesting yet another servo-operated kill switch What Im saying safety redundancy manual switch such positive factors such switches should used much universally now subject good friend Ed Carrol suggested rather simple effective idea redundif transmitter adding couple wires plug switch Ed has dual-battened Krafts Futabas hes flown several times during day simple flip switch gives him freshly charged battery transmitter hes off two-day weekend Giant rally really doesnt have worry about having stay motel recharge trans mitter actual use Ed has stuck extra set transmitter batteries back case some Velcro doesnt look sexy system works like gangbusters have give credit inspiration column newfound friend John P Violette LaPlace LA Johns magnificent B-17G model appears months effort rather exten sive correspondence John fully documented history prototype Fortress Con gressional Medals Honor awarded its crewand developed what amounts complete history well Boeings letter Charles 0 Brown 8101 Sonar Rl Clinton MD 20735 Charlies gone route trying document specific Grumman Bearcat has come up empty Any out can provide photos anything concerned F8F-2 civilian llcense number N7700C flown air shows Bill Fornoff se drop Charlie line know Dan Lutz will happy see Boeing F4B-2 months column Since Dans picture know hes recovered its just physical recovery either since hes back workshop first met Dan gave SO-cent tour Kraft factory like fivebuck tour about 10 years ago Emil Agosta Dry Ridge Models 59 McCurry RdWeavervilleNC28787isatitagain Back designing beautiful Giant models latest J-4 Sportster -scale has span 114 1824 sq wing area Itll powered OS Max 91 FSR bones weigh tad under seven pounds guessti mate radio engine covering ultralight Scale model will top out between 12 13 lb prototype model flown Emil will probably offer drawings maybe kit Bill Hannans done another onel Volume 2 Intern ational Peanuts & Pistachios out 140 Model Aviation INTERCEPTOR Ready Fly $695 U build Kit $4 95 Note Please odd $3 P & H 1st 3 models Add tO % price additional model COMPANY PO Box 68132 Portland OR 97268 Fokker D-VII VK Model Aircraft PO Box 3007 Aurora IL 60505 312-357-1883
Edition: Model Aviation - 1987/09
Page Numbers: 46, 47, 137, 140
Radio Control Scale Bob Dolly Wischer PIANO HINGE ubiquitous piano hinge used aircraft cowl hatch hinge joints used good reason affords very secure hinge arrangement light weight adaptability Its real drawback its inability follow curved line see piano hinge assured no compound curves cowl Description piano hinge con tinuation interleaving hinge points long wire passing through segments can length have seen models operational piano hinges some quite well-made considering fact modeler produced handwork small models however problem Scale appearance lost due difficulty obtaining true dimensions diameterand especially spacing between hinge segments own best efforts have direction reasonable simulaton always flattered someone asks source assumption commercial item purchase model scale range /8 use easily obtainable /16-in aluminum tube hobby shop add grooves regular spacing simulate joints piano hinge grooves can made rolling tube beneath single-edge razor blade requires very deft touch extreme care avoid inadvertently cutting directly through tube best system have found impressing grooves lathe tube gripped three-jaw chuck X-Acto razor saw held gently against tube close possible jaws course means lathe must stopped started groove tube moved progressively outward Lacking lathe another method applying grooves V-groove cut length hardwood block produce V groove setting circular saw blade 450 angle blade extending about 045 050 above table top Later alu minum tube laid groove cant escape being twirled under single-edge razor blade X-Acto razor saw Again light touch needed avoid making small pieces now have length aluminum tube has become quite fragile flexible applied model setting hollow formed between adjacent cowl plates can used directly gluing place flexible cement such Wilhold R/C 56 tube fastened outer surface cowl no hollow exists illusion piano hinge lost because tube stands too high remedy situation return tube hardwood V-block file away side obtain flat surface gluing best appear ance remove aluminum file comes close breaking through tubes inside diameter Only tiny amount R/C 56 used fasten tube place Remove excess glue sharp toothpick knife blade glue dries clear somewhat rubbery use R/C 56 fasten aluminum metalwork balsa plywood substructure models never joint failure fact metal bent useless shape tries remove afterward Cowl latch photo showing piano hinge cowl Douglas Mailplane note two protrusions top larger simu lates carburetor air intake prototypes Liberty V-12 engine smaller bent tube opening facing forward simulating vent Libertys oil tank model de cided tube could used operator cowl hold-down latch operator actually short length 3A2-in music wire bent sharply 900 its square-cut end painted flat black simulate open-ended tube Rotating operator 9fl0 turns brass plate sol dered its inner end pulls two /16-in music wire latches inward release cowl closeup details Bobs new Douglas M5liPl5fl Birdcage metal brace wires CL suspect culprits Tar RF-noisecausea radio glitch problems droplet solder crossover point cabane wires quieted some static noise Simulated piano hinge R crest cowl actually grooved aluminum tube Note simulated vent tube located just aft scale carburetor air intake vent tube actually piece music wire upper end cowl-latch actuator 46 Model Aviation Dan Molinos clipped-wing Cub Above began Big kit An OS Gemini 120 twin four-stroker powers Weight isi 3 lb Finish Big dope over Super Coverite Charlip Nelsons scratch-built Waco VKS-7F R uses 05 90 four-stroke power Scale 225 ln/ft span 784 weight 14 lb Finish Randolph dope over Koverail Both models seen Mint Julep contest wire ends hook beneath small hardwood blocks fastened cowl sides models engine first run cowl place immediately observed operator moving unlatched posi tion due engine vibration safety-pin-type spring added has over-center oper ation tends remain either latched unlatched positions convinced out spring cowl would have departed first flight Note intemal wood brace simply glued aluminum cowls interior sur face again using R/C 56 After dozen flights cowl remains secure Glitch problems Douglas Mailplane truly flying bird-cage 28 streamlined steel rigging wires between wings steel cabane landing gear struts six steel cables tail surfaces music wire pushrods ailerons steel brace wires tail surfaces addition aluminum plates simulate fuel tanks both wings metal fuselage top cowl sides bottom receiver antenna runs rearward through fuselage bottom parallel con trol cables spite potential trouble RF interference early flights reason ably successful its first contest Mint Julep May Continued page 137 PRECISION Hawker Hurricane MK lic $14950 Wing Span 62 inch Weight 61/2 81/2 lbs depends flaps retracts Full Scale Detail includes 5 view flaps retracts setup Engine 65-90 FS 60 TS Fiberglass cowl Aero-Pacer $8900 Sport-Trainer Wing Span 641/2 inch Weight 5-7 Ibs Wing load 19-25 oz Engine 45-65 ES 29-45 TS Easily converted tail dragger flaps Video construction tape available Baby-Pacer $5950 Versatile small size Wing Span 50 inch Weight 25-35 Ibs Wing load 19-25 oz Engine 15-40 FS 19-25 TS ELECTRIC 4 HANDCUT SELECTED BALSA AND HARDWOOD PARTS. ALL WITH MADE IN USA QUALITY DH6O Gipsy Moth $10900 Wing Span 541/4 inch Weight 5-6 Ib Wing Load 15 oz Engine 45-65 ES 35-SO TS Flybaby 2 1 Combo Flybaby $7950 Bipe $9500 Combo $11000 Wing Span 56 44 inches Weight 4-5 lbs Wing Load 22 14 oz Engine 30-45 ES 25-40 TS AT FIELD CONVERSION 10 MI N ONLY $6996 * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $225 Cat No 202 Air Cleaner Fine $225 Replacement Inserts Cat No 104 PkI2 Inserts Coarse $195 Cat No204 PkI2 Inserts Fine $195 FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 SAFETY STARTING September 1987 47 Simple cowl latch Bobs Mailpiane has lever retracts two hold-down pIns safety-pin-type spring locksthe latch pins closed position VISA Mastercard COD money order Add $550 Post Handling Mich residents add 4% Wdeo Catalog $1000 Beta VHS $5 rebate order Cowls either ABS Fiberglass Plan Packs Available Making simulated piano hinges V-notch hardwood block used hold aluminum tube being grooved file later flat filed sideto provideagoodsurfaceforglulng hinge model structure -r-14Qit0 AERODROME MODELS LTD-----\MODELSLTo/ 2623 S MILLER RD SAGINAW MI 48603 517 781-3000 4 OPTIMIZE YOUR ENGINES OUTPUT TATONES THRUST TESTER #7rvvYN~TATONE 30-13 Use TATONES. ALUM MOTOR MOUNT THRUST TESTER determine maximum output usingENGINE engineTHROTTLE differentCONTROL props fuel mixtures RPM levels Check engineDIRECT READI NGA ST DIAL RC Scale/Wischers Continued page 47 model encountered series elevator aileron glitches threatened destruction remembered first Douglas built 17 years previously similar prohlems solu tion solder points pairs cabane wires crossed about other wires case wires terminated wood did touch adjacent wires bellcranks control cables made plywood Only cabane brace wire ends fastened metal meet 5A2-in music wire struts Vibrating metal prime source RF interference single-cylinder four-stroke en gines vibrate early flights made dummy pilot cockpit contest pilots presence necessity because dras tic loss realism points during flight dummy isnt present could plastic dummy pilot cause electrical noise near-disastrous flight close examination re vealed likely reason Williams Bros plastic pilot figure mounted strip springy aluminum could snapped place flights quickly removed static judging ends aluminum strip pressed against interior aluminum cockpit cowling engine vibration could rub metal against metal light pressure came con clusion really asking trouble Insulating tubing now glued mounting strip ends electrically isolate contact cowl Only Scale modelers unorthodox building methods materials susceptible built-in problems brings mind sign saw EAA Oshkosh convention depar ture point full-size aircraft succinctly wams DONT DO NOTHING DUMB Bad gram mar effective problem would have re peated next flight whenever dummy pilot replaced Servo size reader asks information selection servo sizes Scale models question facets answer because wide variation airplane type readers basic concem came about because label attached model indicating quarterscale him meant large size prob able need high-energy servos term quarter-scale very misleading small pro totype aircraft A-scale could small model servos needed flight controls can standard types output torque 30to 40-in-oz range would normally expected such model would have weight less 15 lb Weight speed Scale model factors determine necessary servo output torque Scale ratio has little effect servo size very active aerobatic-type model large control sur faces moving stop stop would obviously need servos greater output have flown 14-lb model using Ace Bantam Midget servos having 18 in-oz torque model definitely non-acrobatic type no great demands placed servos aero batic type weight range up 15 lb servos output torque 35- 45-in-oz should job heavyweight models above 20 lb use either largest servos two regular ones parallel Ailerons elevators large models up 15 lb control surfaces greatest area controls likely overburden weak servo have noticed definite tendency elevators unable deflect fully during dive after such maneuvers recovery spin split-S Because large size elevators amount deflection actually visible ground can see reduced motion during pull-out after maneuvers reduction noticeable throttle open prop slipstream adding elevators burden other words need altitude safely pull out dive throttle open 38-in-oz servo would prob ably considered marginal elevator However same airplane never flown aerobatically such servo size would adequate Basic differences outputs various servos can traced motor size Practically modem servos use motor 16mm diameter dimension determining factor servo extemal dimensions servos have output 40-in-oz range large models intended fast flight violent maneuversa servo such Ace Atlas pre ferred Atlas conservatively rated 45 in-oz uses 20mm diameter motor indicates larger case size need 600 mAb batteries avoid long pushrods ailerons some mod elers using two servos aileron use two servos parallel elevators also has merit course drain batteries increased 600 800 mAh should used particularly flights long Continued page 140 u [liii W U wiri H To NOSTALG-Air PO Box 8510 Michigan City Indiana 46360 September 1987 137 SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane %fl PRECISION PRODUCTS INC 714 592-5144 L 510 E Arrow Highway San Dimas CA 91773 SEND $300 12 page catalog Ii 47 Planes Prints Frames Mats Three indispensable references for only modelers . shown Two largevolumes Appros 800 photos newcolor Large format 300 plus photos nearly 100 detailed shots US $60 2 4 large color prints aces 3-views US$40 including post beautiful wall chart aircraft Bank authorized check MO please color Bank authorized check MO please NOTE For complete color catalog please send 2 International Reply Coupons Ask post office KOOKABURRA TECHNICAL PUBLICATIONS Pty Ltd P0 Box 648 Dandenong 3175 Victoria Australia 1 TRIM KNIFE Trim Knife designed precisely edge trim excess cover ing material model Can used outside edges straight curved Blade can set trom 1/16 1/4 simple adlustment screw Trim Knife mill make perfect overlap ous seams Works witn cover ig materials 6 blades Trim Knife Set includes 6 blades $900 Trim Knife Blades 5 per pack $300 m -IA No Notches Straight Cuts Heavy duty estra sharp no notch blade Same sice regular blades tip does flex cusing strip png thicker materials Great big birds Big Bird Blades box 100 blades$950 Trial size package 20 blades$250 RC Scale/Wischers Continued page 137 flights between charges Heavy flight loads single servo also place extra drain batteries Hobbypoxy colors Pettit Paint Co manufac turers Hobbypoxy products has published mulas mixing colors used contemporary Israeli Air Force aircraft colors Pale Green FS-34227 Tan FS-30219 Sand FS-33531 Light Gray FS-36622 Two colors Tan Light Gray same used contemporary USAF aircraft published column earlier formulas Light Gray 12 parts HIO White five parts H55 Cream two parts H70 Gray Tan five parts H65 Bright Red three parts HIO White two parts H49 Cub Yellow part H70 Gray part H81 Black Pale Green II parts H70 Gray seven parts H47 Bright Yellow part H24 Dark Blue part H Ifi White part H57 Bright Orange Sand 14 parts H55 Cream two parts H70 Gray part H65 Bright Red part HIO White Bob Dolly Wiseher 5-22] Lapham Peak Rd Delafield WI 530 J8 RC Old-Timers/Mathews Continued page 49 ials Lake Rocket City now Sig sure easy install particularly strip stock like use Old-Timers need cut slot wood knife slide hinge dry flow thin CyA glue seam bit stiff like Old-Timers control surface air loads usually low control inputs infrequent additional battery drain due stiff hinges likely insignificant Finally note some amusement other Old-Timer columnists another pub lication challenges us report onand take stand aboutthe raging dispute hassle over SAM Society Antique Modelers RC competition rules will compete national level primarily due sort hostility competition tends create what otherwise nice people included fore express own opinions would totally unfair intent column influence opinion rather create interest fascinating aspect hobby chronicle its history hope various sundry warring parties will soon recognize damage such attitudes doing will get back basic function recreational activity. enjoy what Its worth Ive spent last eight months developing ELT entry-level trainer trying combine aerodynamic parameters Old-Timer easier construction techniques contemporary design Talk about challenge sixth revision currently flying both OS 20 four-stroker K&B 20 Sportster two-stroker results develop ment flying perhaps significant worth comment friend flying site recently called attention OS four-stroker aw first Surpass series though advertised such correct Just take look bubbles head covers. high-lift cams forth have obviously used Further switching engines produces virtually no difference linear velocity models flight Conclusion least instance 20 four-stroker right 20 twostroker Dee B Mathews 909 Maize Rd Townhouse 734 Wichita KS 87212 RC Giant Scale/de Vries Continued page 51 ignitionone can reached safely outside model Im suggesting yet another servo-operated kill switch What Im saying safety redundancy manual switch such positive factors such switches should used much universally now subject good friend Ed Carrol suggested rather simple effective idea redundif transmitter adding couple wires plug switch Ed has dual-battened Krafts Futabas hes flown several times during day simple flip switch gives him freshly charged battery transmitter hes off two-day weekend Giant rally really doesnt have worry about having stay motel recharge trans mitter actual use Ed has stuck extra set transmitter batteries back case some Velcro doesnt look sexy system works like gangbusters have give credit inspiration column newfound friend John P Violette LaPlace LA Johns magnificent B-17G model appears months effort rather exten sive correspondence John fully documented history prototype Fortress Con gressional Medals Honor awarded its crewand developed what amounts complete history well Boeings letter Charles 0 Brown 8101 Sonar Rl Clinton MD 20735 Charlies gone route trying document specific Grumman Bearcat has come up empty Any out can provide photos anything concerned F8F-2 civilian llcense number N7700C flown air shows Bill Fornoff se drop Charlie line know Dan Lutz will happy see Boeing F4B-2 months column Since Dans picture know hes recovered its just physical recovery either since hes back workshop first met Dan gave SO-cent tour Kraft factory like fivebuck tour about 10 years ago Emil Agosta Dry Ridge Models 59 McCurry RdWeavervilleNC28787isatitagain Back designing beautiful Giant models latest J-4 Sportster -scale has span 114 1824 sq wing area Itll powered OS Max 91 FSR bones weigh tad under seven pounds guessti mate radio engine covering ultralight Scale model will top out between 12 13 lb prototype model flown Emil will probably offer drawings maybe kit Bill Hannans done another onel Volume 2 Intern ational Peanuts & Pistachios out 140 Model Aviation INTERCEPTOR Ready Fly $695 U build Kit $4 95 Note Please odd $3 P & H 1st 3 models Add tO % price additional model COMPANY PO Box 68132 Portland OR 97268 Fokker D-VII VK Model Aircraft PO Box 3007 Aurora IL 60505 312-357-1883