Free Flight Duration Harry Murphy ANOTHER PENNY two received lotsa comments mail Getting lOg Worth article last column Most missives apparently old enough have listened Lone Ranger radio right along Boss Ross myself meticulously labored constructing wondrous dime scale beauties yesteryear Typical nice letter received Bruce Ihde Tulsa OK Bruce sez enjoyed article lOg kits Dad built first model 1933 Ideal kit 12-in-span Boeing biplane fighter 25g mail order built Saturday basement workbench course ran out glue sup plied kit finished Duco cement took years develop skill build complete model just glue supplied little bottle next year local bookstore stocked Comet Megow kits built bunch dime ones too made mess covering flour water paste discovered banana oil stocked bulk drug store supplied own bottle bought nickel ounce very superior product both adhering paper coating after shrink ing rubber-powered modelsand wish could get some today Remember fineness Japanese tissue days could tear strip narrow /16-in grain Did ever catch fly glue strips tail tum him loose Great fun watching strips paper buzz around room Now will get letters Humane Society RMcM Eventu ally cheap models began fly quite well skills improved went bigger props better rubber used winders got back modeling RC few years ago recently started rubber-powered ones again grandson too seem have lot releam building small ones Thanks Bruce never built Ideal kit guess must have before timebut seldom whole quarter spend back anyway Oh yeah did enter ME 109 Spring CIA FF Meet Dayton OH placed second Ted Dock did whopping 44 sec first flight Comet Fairchild 22 No fair Hed practicingand wife Nadine braided rubberband also gave away 50 plan kits old lOg Comet line contestants gob bled up like candyso expect whole squadron entries fall meet October event-promotion stunt Frank Heeb famous Rubber flier own right sent note stating enjoyed watching lOg Scale event added event might bit rewarding outdoor purposes models little larger say order 20- 24-in wingspan sounds like 25g range figure have about 20 bucks log ME 109 1 wonder much will cost build 25g model Anyway also suggested possible handicap bi/triplanes w-wingers also crossed mind after Ted Dock beat ME 109 aybe club out Readerland has already addressed issue will offer its expertise matter hint hint hate dwell topic want also acknowledge plan copies fine letter Elmer Cunningham East Alton IL also sent some photocopies log kit listings 1939 Megow 1940 Comet product line catalogs Megow kits either 12- 15-in wingspans Comets mostly 16 few 20 Elmer says still has few old kits grew up near Lambert Field Thirties Charles Lindbergh originated exploits Elmer naturally came air-minded youth Elmer also mentioned something never knewthat Kelloggs once offered log 25g Megow kits certain number boxtops 3g stamp Egads similar kit now would cost five times cost com flakes todays prices Progress strikes again Grate-Shapes Mike Genovese Bell Rock Indus tries sent some samples silicon-carbide-grit sanding blocks calls Grate-Shapes just what doctor ordered project requires generating lot balsa dust such working down leading trailing edges wing big Gassie 72 Model Aviation Murf built Ed Toner-designed up-sized Comet Phantom Fiash ROG forthe PeeWee-30 event Finish aii biack skuil-and-croasbones emblems Power PeeWee 020 Cincinnati Red fan Jim Haught dispiays neat Cox 020-powered Kerswap Dick Lyons pians took first CiAs 1987 OT NosGas bash WPAFB Dayton OH No worry about gouging out niche too much material hurriedly attempt ing carve down wing tip Using proper Grate-Shape will prevent happening basic Grate-Shapes wood blocks about 10-in long have -in-sq cross-section four sides having specific-sized rounded channel angled V-groove per tains wing leading edges like blocks double-coated long-lasting silicon carbide grit recommended use both balsawood foam block should load up little balsa dust simply give small whack Oat workbench remove excess dust can scrub occasion ally stiff bristle brush like also come round shapes like dowel rods -in increments A-in diameter oneinch diameter also /2- one-inchsquare cross-section wood bars rather obvious blocks de signed primarily aid RC model construction have definite purpose Free Flight well Personally like flat-sided blocks would recommend GS #105 universal starter block FFers has 1-in-wide flat side opposite side having rounded 5A-in-wide groove great working down leading edges speed working down wing finish-sanding status amazing local hobby shop cannot supply check BRIs ad magszine prices complete rundown products Anyway single GS #105 block $495 plus dollar shipping handling Send Bell Rock dustries 6486 Hwy 179 Suite 108 Sedona AZ 86336 Youll love em Theyre GRATE Rubber-powered ROG number rubberpowered events often require model launched ROG rise-off-ground position Having seen pretty rubber model meet its demise concrete runway under rather windy conditions attempting ROG launch excerpt subject Ed Lidgard caught eye April issue Thunderbugs Free Flight Clubs newsletter Bugs Buzz Sez Ed First let us assume imperative prop released just fraction second before releasing model torque burst suddenly applied flying surfaces will have upsetting effect model Secondly warps except planned washout tips possibly left panel washin should exist surfaces arent correct dont fly Anytime! Third remember offset thrust low-speed ad justment Aerodynamic balance handles ini tial torque fourth requirement confidence physical movements launching gained practice Really its easy philosophy model flies well should ROG adequately powered Short motor runs however will cause zoom problems since transition knee torque curve short Model designs have Dutch roll problems such Jabberwocks hard ROG using conventional tactics cure veryhigh-powered models take off left wind trim slight left bank very steep climb initial torque falls off model assumes right climb also gets model high before heading downwind old Wakes about 200 ft model above ground turbulence easily handles downwind turn can accomplished minimal downthrust less right thrust necessarily recommendation prepare warp-free model Measure intentional warps eliminate unwanted warps know angular difference offset thrust CG before flying trimming isnt guess Test fly until max power achieved calm tall grass make -power ROG Retrim CG location rearward little added downthrust doesnt cure zoom Fly power until become sure go 3/4-power let wind blow Find tall veg etation havent made significant changes model shouldnt get much less time hand launch some loss going occur model flies well now full power should no problem its windy has worked hope does Good four-step advice Mr Lidgard seems articles model trim whatever pur pose include heavy point model being warp-free intentional warps being added specific purposes such washout wing tips like too us ever end up completed model warp-free does get rid nasty old warps major surgery Gee thought everyone knew de warp model until young novice recently asked done So novice Pour teakettle about half-full water heat boil steam starts coming out spout hold model component steam no closer three inches spout slightly bend component opposite direction let steam work affected area Make sure no flame coming up around teakettle might catch model Continued page 170 October 1987 73 US FAI FF team member Dale Mateershowed up WPAFB practice four models istaking World Champs FrancethisAugust Dale usesthe bunt system power-to-glide transition worked very Impressively him Grate Shapesl Super sanding tools big job Theres info column after piston has started downward engine connect 1 -volt battery Incidentally ignition occurs points proceed start engine engine will opennot close After engine run giow plug long battery running spark timing advanced moving connected will allow get fuel timer arm against direction propeller regulated hassle ignition sys rotation until maximum rpm obtained tem technique good way isolate fuel problems ignition problems Run ignition engine times until thoroughiy acquainted its operation before install airplane head flying field start engine open needle valve three four turns choke engine turning propeller holding finger over air intake will draw fuel engine Retard spark energize ignition system Crank engine normal manner until starts Adjust needle valve spark advance alternately until engine running properly engine fails start remove spark plug lead high-tension lead spark plug hold its end near engine neighborhood urning prop watching high-voltage spark will quickly learn good idea touch bare end high-tension lead part engine part body cranking engine no spark try advancing ignition timer bit since may have retarded much sparking cannot occur Also check see points clean dry proper clearanceabout 012 RMcM Oil points will create insulating film prevent sparking Other causes no spark poor electrical connections bad batteries broken hookup wires have spark engine doesnt fire check fouled spark plug Remove plug hook high-tension lead its normal spot plug hold metal base plug against engine rotating prop ignition system course should see good hot spark jump between spark plug electrodes plug fouled oil wont work Also just automobile spark plugs possible plug have internal failure will prevent firing Its always good idea carry spare spark plug flying field ignition system checks out experiment needle valve setting prime engine few drops fuel exhaust port else fails screw giow plug Catalogs Ijust received neat catalog OldTimer Model Supply PO Box 7334 Van Nuys CA 91409 OTMS operated Ken Sykora longtime enthusiast Old-Timer modeling have read articles SCIF newsletter Flightplug signs King Sugar Ken offers hard-to-locate items mainly rubber-power field including extensive inventory rubber-model plans Stahi Struhl Lindberg Comet Megow Scien tific etc New tools also received sample new sanding block called appropriately GrateShapes come grit bonded surfaces sold shapes including flats grooves making V-shaped edges radiuses suitable leading edges other curved model parts round bars really work well manufacturer Bell Rock Indus tries 6486 Hwy 179Suite 108 Sedona AZ 86336 See ad magazine Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 FF Duration/Murphy Continued page 73 fire As added precaution have small fire extinguisher keep handy never know light structures may take few seconds steam steam very hot get fingers too close vapor either have pair old insulated winter work gloves use procedure work fine Heavy structures like large wing Gas model take longer soak steam before becoming pliable enough reshape What steam does induce moisture wood struc ture balsawood gets very soft pliable moisture added move model component out steam retain overbend hold short time until area cools somewhat results either too drastic still satisfactory repeat process until have warp-free panel specific warp situation desire can repeat process times slightest dam age model may wish check model few days see warp results holding place simple process very few models escape least teakettle session before finding way test field hope helps offspring say get steamed quite often What mean 1988 SAM Champs 1987 SAM Society Antique Modelers Championships ongoing Seguin TX writing Meanwhile plans proceeding 1988 Midwest-sponsored ver sion held Mid America Airport near Lawrenceville IL Bob Larsh SAM Midwest VP has advised arrangements have firmed up Vincennes University officials dormi tories bean feed banquet Vincennes just few miles back across Red Skelton Bridge spans mighty Wabash River separates Indiana Illinois area dates yet confirmed will prob ably mid-July enable local farmers bring potato crop before big-footed Free Flighters show up Bob says official flying will span four days all-day MECA Model Engine Collectors Association Collectogether ing scheduled day preceding took two-day Old-Timer Free Right Contest last June sponsored host clubs Tri-County Aero Club TCAC SAM 57 SAM chapter based Marion IL guys gals certainly looking ward big event 88 Sounds like great fun will giving exact dates other pertinent details next column Keep listen ing Meanwhile see ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Scale/Warner Continued page 75 Box 13 Braintree MA 02184 Delays answer ing correspondence filing orders have due some bad luck Joe has neverto knowledgecashed customers check until merchandise its way Having trouble getting silk tight models days Ill admit have real bear time last two planes cover wet silk have beautifully tight wrinide free plane start apply dope yet have piece wrinkled sagging garbage finish desperation finally set aside namebrand nitrate dope Sig Lite-Cote used some nut-brown GI surplus nitrate Bobby Chambers gave years ago Despite its age having turned color tightened up sadlooking covering beautifully warned nitrate dope nitrate dope anyone knows good reliable tautening opposite nontautening popular jargon nitrate dope let us old supplies running low Continued page 172 170 Model Aviation
Edition: Model Aviation - 1987/10
Page Numbers: 72, 73, 170
Edition: Model Aviation - 1987/10
Page Numbers: 72, 73, 170
Free Flight Duration Harry Murphy ANOTHER PENNY two received lotsa comments mail Getting lOg Worth article last column Most missives apparently old enough have listened Lone Ranger radio right along Boss Ross myself meticulously labored constructing wondrous dime scale beauties yesteryear Typical nice letter received Bruce Ihde Tulsa OK Bruce sez enjoyed article lOg kits Dad built first model 1933 Ideal kit 12-in-span Boeing biplane fighter 25g mail order built Saturday basement workbench course ran out glue sup plied kit finished Duco cement took years develop skill build complete model just glue supplied little bottle next year local bookstore stocked Comet Megow kits built bunch dime ones too made mess covering flour water paste discovered banana oil stocked bulk drug store supplied own bottle bought nickel ounce very superior product both adhering paper coating after shrink ing rubber-powered modelsand wish could get some today Remember fineness Japanese tissue days could tear strip narrow /16-in grain Did ever catch fly glue strips tail tum him loose Great fun watching strips paper buzz around room Now will get letters Humane Society RMcM Eventu ally cheap models began fly quite well skills improved went bigger props better rubber used winders got back modeling RC few years ago recently started rubber-powered ones again grandson too seem have lot releam building small ones Thanks Bruce never built Ideal kit guess must have before timebut seldom whole quarter spend back anyway Oh yeah did enter ME 109 Spring CIA FF Meet Dayton OH placed second Ted Dock did whopping 44 sec first flight Comet Fairchild 22 No fair Hed practicingand wife Nadine braided rubberband also gave away 50 plan kits old lOg Comet line contestants gob bled up like candyso expect whole squadron entries fall meet October event-promotion stunt Frank Heeb famous Rubber flier own right sent note stating enjoyed watching lOg Scale event added event might bit rewarding outdoor purposes models little larger say order 20- 24-in wingspan sounds like 25g range figure have about 20 bucks log ME 109 1 wonder much will cost build 25g model Anyway also suggested possible handicap bi/triplanes w-wingers also crossed mind after Ted Dock beat ME 109 aybe club out Readerland has already addressed issue will offer its expertise matter hint hint hate dwell topic want also acknowledge plan copies fine letter Elmer Cunningham East Alton IL also sent some photocopies log kit listings 1939 Megow 1940 Comet product line catalogs Megow kits either 12- 15-in wingspans Comets mostly 16 few 20 Elmer says still has few old kits grew up near Lambert Field Thirties Charles Lindbergh originated exploits Elmer naturally came air-minded youth Elmer also mentioned something never knewthat Kelloggs once offered log 25g Megow kits certain number boxtops 3g stamp Egads similar kit now would cost five times cost com flakes todays prices Progress strikes again Grate-Shapes Mike Genovese Bell Rock Indus tries sent some samples silicon-carbide-grit sanding blocks calls Grate-Shapes just what doctor ordered project requires generating lot balsa dust such working down leading trailing edges wing big Gassie 72 Model Aviation Murf built Ed Toner-designed up-sized Comet Phantom Fiash ROG forthe PeeWee-30 event Finish aii biack skuil-and-croasbones emblems Power PeeWee 020 Cincinnati Red fan Jim Haught dispiays neat Cox 020-powered Kerswap Dick Lyons pians took first CiAs 1987 OT NosGas bash WPAFB Dayton OH No worry about gouging out niche too much material hurriedly attempt ing carve down wing tip Using proper Grate-Shape will prevent happening basic Grate-Shapes wood blocks about 10-in long have -in-sq cross-section four sides having specific-sized rounded channel angled V-groove per tains wing leading edges like blocks double-coated long-lasting silicon carbide grit recommended use both balsawood foam block should load up little balsa dust simply give small whack Oat workbench remove excess dust can scrub occasion ally stiff bristle brush like also come round shapes like dowel rods -in increments A-in diameter oneinch diameter also /2- one-inchsquare cross-section wood bars rather obvious blocks de signed primarily aid RC model construction have definite purpose Free Flight well Personally like flat-sided blocks would recommend GS #105 universal starter block FFers has 1-in-wide flat side opposite side having rounded 5A-in-wide groove great working down leading edges speed working down wing finish-sanding status amazing local hobby shop cannot supply check BRIs ad magszine prices complete rundown products Anyway single GS #105 block $495 plus dollar shipping handling Send Bell Rock dustries 6486 Hwy 179 Suite 108 Sedona AZ 86336 Youll love em Theyre GRATE Rubber-powered ROG number rubberpowered events often require model launched ROG rise-off-ground position Having seen pretty rubber model meet its demise concrete runway under rather windy conditions attempting ROG launch excerpt subject Ed Lidgard caught eye April issue Thunderbugs Free Flight Clubs newsletter Bugs Buzz Sez Ed First let us assume imperative prop released just fraction second before releasing model torque burst suddenly applied flying surfaces will have upsetting effect model Secondly warps except planned washout tips possibly left panel washin should exist surfaces arent correct dont fly Anytime! Third remember offset thrust low-speed ad justment Aerodynamic balance handles ini tial torque fourth requirement confidence physical movements launching gained practice Really its easy philosophy model flies well should ROG adequately powered Short motor runs however will cause zoom problems since transition knee torque curve short Model designs have Dutch roll problems such Jabberwocks hard ROG using conventional tactics cure veryhigh-powered models take off left wind trim slight left bank very steep climb initial torque falls off model assumes right climb also gets model high before heading downwind old Wakes about 200 ft model above ground turbulence easily handles downwind turn can accomplished minimal downthrust less right thrust necessarily recommendation prepare warp-free model Measure intentional warps eliminate unwanted warps know angular difference offset thrust CG before flying trimming isnt guess Test fly until max power achieved calm tall grass make -power ROG Retrim CG location rearward little added downthrust doesnt cure zoom Fly power until become sure go 3/4-power let wind blow Find tall veg etation havent made significant changes model shouldnt get much less time hand launch some loss going occur model flies well now full power should no problem its windy has worked hope does Good four-step advice Mr Lidgard seems articles model trim whatever pur pose include heavy point model being warp-free intentional warps being added specific purposes such washout wing tips like too us ever end up completed model warp-free does get rid nasty old warps major surgery Gee thought everyone knew de warp model until young novice recently asked done So novice Pour teakettle about half-full water heat boil steam starts coming out spout hold model component steam no closer three inches spout slightly bend component opposite direction let steam work affected area Make sure no flame coming up around teakettle might catch model Continued page 170 October 1987 73 US FAI FF team member Dale Mateershowed up WPAFB practice four models istaking World Champs FrancethisAugust Dale usesthe bunt system power-to-glide transition worked very Impressively him Grate Shapesl Super sanding tools big job Theres info column after piston has started downward engine connect 1 -volt battery Incidentally ignition occurs points proceed start engine engine will opennot close After engine run giow plug long battery running spark timing advanced moving connected will allow get fuel timer arm against direction propeller regulated hassle ignition sys rotation until maximum rpm obtained tem technique good way isolate fuel problems ignition problems Run ignition engine times until thoroughiy acquainted its operation before install airplane head flying field start engine open needle valve three four turns choke engine turning propeller holding finger over air intake will draw fuel engine Retard spark energize ignition system Crank engine normal manner until starts Adjust needle valve spark advance alternately until engine running properly engine fails start remove spark plug lead high-tension lead spark plug hold its end near engine neighborhood urning prop watching high-voltage spark will quickly learn good idea touch bare end high-tension lead part engine part body cranking engine no spark try advancing ignition timer bit since may have retarded much sparking cannot occur Also check see points clean dry proper clearanceabout 012 RMcM Oil points will create insulating film prevent sparking Other causes no spark poor electrical connections bad batteries broken hookup wires have spark engine doesnt fire check fouled spark plug Remove plug hook high-tension lead its normal spot plug hold metal base plug against engine rotating prop ignition system course should see good hot spark jump between spark plug electrodes plug fouled oil wont work Also just automobile spark plugs possible plug have internal failure will prevent firing Its always good idea carry spare spark plug flying field ignition system checks out experiment needle valve setting prime engine few drops fuel exhaust port else fails screw giow plug Catalogs Ijust received neat catalog OldTimer Model Supply PO Box 7334 Van Nuys CA 91409 OTMS operated Ken Sykora longtime enthusiast Old-Timer modeling have read articles SCIF newsletter Flightplug signs King Sugar Ken offers hard-to-locate items mainly rubber-power field including extensive inventory rubber-model plans Stahi Struhl Lindberg Comet Megow Scien tific etc New tools also received sample new sanding block called appropriately GrateShapes come grit bonded surfaces sold shapes including flats grooves making V-shaped edges radiuses suitable leading edges other curved model parts round bars really work well manufacturer Bell Rock Indus tries 6486 Hwy 179Suite 108 Sedona AZ 86336 See ad magazine Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 FF Duration/Murphy Continued page 73 fire As added precaution have small fire extinguisher keep handy never know light structures may take few seconds steam steam very hot get fingers too close vapor either have pair old insulated winter work gloves use procedure work fine Heavy structures like large wing Gas model take longer soak steam before becoming pliable enough reshape What steam does induce moisture wood struc ture balsawood gets very soft pliable moisture added move model component out steam retain overbend hold short time until area cools somewhat results either too drastic still satisfactory repeat process until have warp-free panel specific warp situation desire can repeat process times slightest dam age model may wish check model few days see warp results holding place simple process very few models escape least teakettle session before finding way test field hope helps offspring say get steamed quite often What mean 1988 SAM Champs 1987 SAM Society Antique Modelers Championships ongoing Seguin TX writing Meanwhile plans proceeding 1988 Midwest-sponsored ver sion held Mid America Airport near Lawrenceville IL Bob Larsh SAM Midwest VP has advised arrangements have firmed up Vincennes University officials dormi tories bean feed banquet Vincennes just few miles back across Red Skelton Bridge spans mighty Wabash River separates Indiana Illinois area dates yet confirmed will prob ably mid-July enable local farmers bring potato crop before big-footed Free Flighters show up Bob says official flying will span four days all-day MECA Model Engine Collectors Association Collectogether ing scheduled day preceding took two-day Old-Timer Free Right Contest last June sponsored host clubs Tri-County Aero Club TCAC SAM 57 SAM chapter based Marion IL guys gals certainly looking ward big event 88 Sounds like great fun will giving exact dates other pertinent details next column Keep listen ing Meanwhile see ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Scale/Warner Continued page 75 Box 13 Braintree MA 02184 Delays answer ing correspondence filing orders have due some bad luck Joe has neverto knowledgecashed customers check until merchandise its way Having trouble getting silk tight models days Ill admit have real bear time last two planes cover wet silk have beautifully tight wrinide free plane start apply dope yet have piece wrinkled sagging garbage finish desperation finally set aside namebrand nitrate dope Sig Lite-Cote used some nut-brown GI surplus nitrate Bobby Chambers gave years ago Despite its age having turned color tightened up sadlooking covering beautifully warned nitrate dope nitrate dope anyone knows good reliable tautening opposite nontautening popular jargon nitrate dope let us old supplies running low Continued page 172 170 Model Aviation
Edition: Model Aviation - 1987/10
Page Numbers: 72, 73, 170
Free Flight Duration Harry Murphy ANOTHER PENNY two received lotsa comments mail Getting lOg Worth article last column Most missives apparently old enough have listened Lone Ranger radio right along Boss Ross myself meticulously labored constructing wondrous dime scale beauties yesteryear Typical nice letter received Bruce Ihde Tulsa OK Bruce sez enjoyed article lOg kits Dad built first model 1933 Ideal kit 12-in-span Boeing biplane fighter 25g mail order built Saturday basement workbench course ran out glue sup plied kit finished Duco cement took years develop skill build complete model just glue supplied little bottle next year local bookstore stocked Comet Megow kits built bunch dime ones too made mess covering flour water paste discovered banana oil stocked bulk drug store supplied own bottle bought nickel ounce very superior product both adhering paper coating after shrink ing rubber-powered modelsand wish could get some today Remember fineness Japanese tissue days could tear strip narrow /16-in grain Did ever catch fly glue strips tail tum him loose Great fun watching strips paper buzz around room Now will get letters Humane Society RMcM Eventu ally cheap models began fly quite well skills improved went bigger props better rubber used winders got back modeling RC few years ago recently started rubber-powered ones again grandson too seem have lot releam building small ones Thanks Bruce never built Ideal kit guess must have before timebut seldom whole quarter spend back anyway Oh yeah did enter ME 109 Spring CIA FF Meet Dayton OH placed second Ted Dock did whopping 44 sec first flight Comet Fairchild 22 No fair Hed practicingand wife Nadine braided rubberband also gave away 50 plan kits old lOg Comet line contestants gob bled up like candyso expect whole squadron entries fall meet October event-promotion stunt Frank Heeb famous Rubber flier own right sent note stating enjoyed watching lOg Scale event added event might bit rewarding outdoor purposes models little larger say order 20- 24-in wingspan sounds like 25g range figure have about 20 bucks log ME 109 1 wonder much will cost build 25g model Anyway also suggested possible handicap bi/triplanes w-wingers also crossed mind after Ted Dock beat ME 109 aybe club out Readerland has already addressed issue will offer its expertise matter hint hint hate dwell topic want also acknowledge plan copies fine letter Elmer Cunningham East Alton IL also sent some photocopies log kit listings 1939 Megow 1940 Comet product line catalogs Megow kits either 12- 15-in wingspans Comets mostly 16 few 20 Elmer says still has few old kits grew up near Lambert Field Thirties Charles Lindbergh originated exploits Elmer naturally came air-minded youth Elmer also mentioned something never knewthat Kelloggs once offered log 25g Megow kits certain number boxtops 3g stamp Egads similar kit now would cost five times cost com flakes todays prices Progress strikes again Grate-Shapes Mike Genovese Bell Rock Indus tries sent some samples silicon-carbide-grit sanding blocks calls Grate-Shapes just what doctor ordered project requires generating lot balsa dust such working down leading trailing edges wing big Gassie 72 Model Aviation Murf built Ed Toner-designed up-sized Comet Phantom Fiash ROG forthe PeeWee-30 event Finish aii biack skuil-and-croasbones emblems Power PeeWee 020 Cincinnati Red fan Jim Haught dispiays neat Cox 020-powered Kerswap Dick Lyons pians took first CiAs 1987 OT NosGas bash WPAFB Dayton OH No worry about gouging out niche too much material hurriedly attempt ing carve down wing tip Using proper Grate-Shape will prevent happening basic Grate-Shapes wood blocks about 10-in long have -in-sq cross-section four sides having specific-sized rounded channel angled V-groove per tains wing leading edges like blocks double-coated long-lasting silicon carbide grit recommended use both balsawood foam block should load up little balsa dust simply give small whack Oat workbench remove excess dust can scrub occasion ally stiff bristle brush like also come round shapes like dowel rods -in increments A-in diameter oneinch diameter also /2- one-inchsquare cross-section wood bars rather obvious blocks de signed primarily aid RC model construction have definite purpose Free Flight well Personally like flat-sided blocks would recommend GS #105 universal starter block FFers has 1-in-wide flat side opposite side having rounded 5A-in-wide groove great working down leading edges speed working down wing finish-sanding status amazing local hobby shop cannot supply check BRIs ad magszine prices complete rundown products Anyway single GS #105 block $495 plus dollar shipping handling Send Bell Rock dustries 6486 Hwy 179 Suite 108 Sedona AZ 86336 Youll love em Theyre GRATE Rubber-powered ROG number rubberpowered events often require model launched ROG rise-off-ground position Having seen pretty rubber model meet its demise concrete runway under rather windy conditions attempting ROG launch excerpt subject Ed Lidgard caught eye April issue Thunderbugs Free Flight Clubs newsletter Bugs Buzz Sez Ed First let us assume imperative prop released just fraction second before releasing model torque burst suddenly applied flying surfaces will have upsetting effect model Secondly warps except planned washout tips possibly left panel washin should exist surfaces arent correct dont fly Anytime! Third remember offset thrust low-speed ad justment Aerodynamic balance handles ini tial torque fourth requirement confidence physical movements launching gained practice Really its easy philosophy model flies well should ROG adequately powered Short motor runs however will cause zoom problems since transition knee torque curve short Model designs have Dutch roll problems such Jabberwocks hard ROG using conventional tactics cure veryhigh-powered models take off left wind trim slight left bank very steep climb initial torque falls off model assumes right climb also gets model high before heading downwind old Wakes about 200 ft model above ground turbulence easily handles downwind turn can accomplished minimal downthrust less right thrust necessarily recommendation prepare warp-free model Measure intentional warps eliminate unwanted warps know angular difference offset thrust CG before flying trimming isnt guess Test fly until max power achieved calm tall grass make -power ROG Retrim CG location rearward little added downthrust doesnt cure zoom Fly power until become sure go 3/4-power let wind blow Find tall veg etation havent made significant changes model shouldnt get much less time hand launch some loss going occur model flies well now full power should no problem its windy has worked hope does Good four-step advice Mr Lidgard seems articles model trim whatever pur pose include heavy point model being warp-free intentional warps being added specific purposes such washout wing tips like too us ever end up completed model warp-free does get rid nasty old warps major surgery Gee thought everyone knew de warp model until young novice recently asked done So novice Pour teakettle about half-full water heat boil steam starts coming out spout hold model component steam no closer three inches spout slightly bend component opposite direction let steam work affected area Make sure no flame coming up around teakettle might catch model Continued page 170 October 1987 73 US FAI FF team member Dale Mateershowed up WPAFB practice four models istaking World Champs FrancethisAugust Dale usesthe bunt system power-to-glide transition worked very Impressively him Grate Shapesl Super sanding tools big job Theres info column after piston has started downward engine connect 1 -volt battery Incidentally ignition occurs points proceed start engine engine will opennot close After engine run giow plug long battery running spark timing advanced moving connected will allow get fuel timer arm against direction propeller regulated hassle ignition sys rotation until maximum rpm obtained tem technique good way isolate fuel problems ignition problems Run ignition engine times until thoroughiy acquainted its operation before install airplane head flying field start engine open needle valve three four turns choke engine turning propeller holding finger over air intake will draw fuel engine Retard spark energize ignition system Crank engine normal manner until starts Adjust needle valve spark advance alternately until engine running properly engine fails start remove spark plug lead high-tension lead spark plug hold its end near engine neighborhood urning prop watching high-voltage spark will quickly learn good idea touch bare end high-tension lead part engine part body cranking engine no spark try advancing ignition timer bit since may have retarded much sparking cannot occur Also check see points clean dry proper clearanceabout 012 RMcM Oil points will create insulating film prevent sparking Other causes no spark poor electrical connections bad batteries broken hookup wires have spark engine doesnt fire check fouled spark plug Remove plug hook high-tension lead its normal spot plug hold metal base plug against engine rotating prop ignition system course should see good hot spark jump between spark plug electrodes plug fouled oil wont work Also just automobile spark plugs possible plug have internal failure will prevent firing Its always good idea carry spare spark plug flying field ignition system checks out experiment needle valve setting prime engine few drops fuel exhaust port else fails screw giow plug Catalogs Ijust received neat catalog OldTimer Model Supply PO Box 7334 Van Nuys CA 91409 OTMS operated Ken Sykora longtime enthusiast Old-Timer modeling have read articles SCIF newsletter Flightplug signs King Sugar Ken offers hard-to-locate items mainly rubber-power field including extensive inventory rubber-model plans Stahi Struhl Lindberg Comet Megow Scien tific etc New tools also received sample new sanding block called appropriately GrateShapes come grit bonded surfaces sold shapes including flats grooves making V-shaped edges radiuses suitable leading edges other curved model parts round bars really work well manufacturer Bell Rock Indus tries 6486 Hwy 179Suite 108 Sedona AZ 86336 See ad magazine Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 FF Duration/Murphy Continued page 73 fire As added precaution have small fire extinguisher keep handy never know light structures may take few seconds steam steam very hot get fingers too close vapor either have pair old insulated winter work gloves use procedure work fine Heavy structures like large wing Gas model take longer soak steam before becoming pliable enough reshape What steam does induce moisture wood struc ture balsawood gets very soft pliable moisture added move model component out steam retain overbend hold short time until area cools somewhat results either too drastic still satisfactory repeat process until have warp-free panel specific warp situation desire can repeat process times slightest dam age model may wish check model few days see warp results holding place simple process very few models escape least teakettle session before finding way test field hope helps offspring say get steamed quite often What mean 1988 SAM Champs 1987 SAM Society Antique Modelers Championships ongoing Seguin TX writing Meanwhile plans proceeding 1988 Midwest-sponsored ver sion held Mid America Airport near Lawrenceville IL Bob Larsh SAM Midwest VP has advised arrangements have firmed up Vincennes University officials dormi tories bean feed banquet Vincennes just few miles back across Red Skelton Bridge spans mighty Wabash River separates Indiana Illinois area dates yet confirmed will prob ably mid-July enable local farmers bring potato crop before big-footed Free Flighters show up Bob says official flying will span four days all-day MECA Model Engine Collectors Association Collectogether ing scheduled day preceding took two-day Old-Timer Free Right Contest last June sponsored host clubs Tri-County Aero Club TCAC SAM 57 SAM chapter based Marion IL guys gals certainly looking ward big event 88 Sounds like great fun will giving exact dates other pertinent details next column Keep listen ing Meanwhile see ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Scale/Warner Continued page 75 Box 13 Braintree MA 02184 Delays answer ing correspondence filing orders have due some bad luck Joe has neverto knowledgecashed customers check until merchandise its way Having trouble getting silk tight models days Ill admit have real bear time last two planes cover wet silk have beautifully tight wrinide free plane start apply dope yet have piece wrinkled sagging garbage finish desperation finally set aside namebrand nitrate dope Sig Lite-Cote used some nut-brown GI surplus nitrate Bobby Chambers gave years ago Despite its age having turned color tightened up sadlooking covering beautifully warned nitrate dope nitrate dope anyone knows good reliable tautening opposite nontautening popular jargon nitrate dope let us old supplies running low Continued page 172 170 Model Aviation
