Safety Comes First!

____first Svms RC frequency control rope-and-pulley starters Big Bang ers foam wing fails flight due creeping internal destruction gasoline fuel prop dangersand word caution some types plastic pro pellers John Preston GREAT response Two topics recently discussed column have gen erated readers let ters anything else has mentioned since Safety Comes First appeared January 1980 magazine two topics Frequency Control Flight Training Programs Im trying re spond took time write now summer its difficult keep up incoming mail hap pen writers subjects have yet receive acknowl edgement apologize Let thank now providing input keeps column alive Before leaving subject frequency control Id like mention two communica tions received during last month first letter Bill Hoffmeister Field Chairman Indianapolis RC South club came up frequency control board worth men tioning club uses additive control system member has disc his/her name side word guest other Before turning transmitter mem bers disc attached peg -in shoul der bolt board corresponds frequency used photograph shows layout board mem bers name disc tells other would-be users frequency guest flying word guest would exposed however turning disc over others can see guest flying Bills board covered /4-in Lexan protect elements suggestion others may wish copy design place numerical values indi vidual channels frequencies can seen members disc board same design could also used subtractive control system color-coded removable discs placed pegs would removed substituted members disc before flying second communication frequency control comes Gold Coast Flyer newsletter Art Johnson editor gives us something think about future Ultimate Frequency Control System think present club-card-for-the pin system pretty good sport continues grow popularity may looking sophisticated way job price no object current technology offers almost foolproof way solve several problems First want authorized persons fly sitewe want tie up frequency alloted time must make sure right frequency goals can accomplished bit electronic gadgetry First club members would issued cards mag netic code card frequency board slot frequency would tied multi-frequency spot jammer 100 mw jammer would put out signal frequency board jammer would turn sunrise shut off sunset effectively preventing flying site until member inserted coded card Continued page 14 12 Model Aviation John discusses frequency-control board column month Sorry cant let see colorcircles match transmit ter flag colors hang metal tag pin take turnlike Bill Hoff meister RC42 did . / /1/ /1/7 URE FHEYE NARD TO SEEI.. ur WWEY 005T LOT LESb7 1973 DAE Revolutionized Modeling Statement Now Battery Can ALL AGAIN DAE ADVANCES THE ART OF ELECTRONIC ENGINE STARTING LOW POWER CONSUMPTIONOnly 800 milliamps maximum battery drain SOLID 15v PLUG OUTPUTMaintains 15v starter LIGHTS ANY 11/2v PLUGAutomatically adjusts current plug needs EFFICIENT OPERATION tarter MARK V can also run 6v batter FEATURES AMERICAN MADE QUALITY PULSE DRIVER FOR ANY 1 v PLUG 6v 12v FUEL PUMP SUPPLY DIRECTIONAL PUMP FLOW SWITCHES 48v 96v FAST CHARGER AMMETER MONITORING PLUG CHARGER CONNECTING HARDWARE INCLUDED TWIN OWNERS MARK V lights 2 plugs NO ADJUSTMENTS Only $4795 Also Available Kit Form 5 SEE DEALER FIRSTADA Enterpflses unavailableOrder DirecthjdA ft. N. 3lZ 7U42S * * 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 PkJ2 InsertsCoarse $195 Cat No 204 Pkl2 Inserts Fine $195 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75C shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 frequency choice code would turn off jammer 15 minutes flight time could increased less busy periods warning signal would sound two minutes before time up light would flash frequency use light would go out card re moved signalling frequency available next flier such system feasible Sure think club will installing next week other hand would certainly keep everyone within present site rules wish comment Arts futuristic system suggest write him AMA HQ rather As said before Im already way behind responses mailand wasnt wouldnt touch proverbial 10-ft pole Coming back reality turning subject Giant models letter last month came other Al Big Bird Alman according business card specializes Gimbals Hot Stuffed Judges Bribed Inflight Wing Removals Buddy Cords Cut Batteries Drained Schnuerle Ported Windsocks Al no doubt know also writes Big Bird column Model Builder magazine July 1983 issue touches same safety issue letter namely use rope starters large en gines Over Al Something feel gross safety vio lation no has yet mentioned fi nally did address problem July column practice some have hard-starting hand Evras Ropers utilize rope starter idea having pulley immediately front back prop rope close sends chills up down spine Someone going get hacked death handle end rope may very well end up being bystander What weapon rope would make being whirled around spinning prop Gad AlsoI feel some Big Bird lovers have slacked off bit regards safety think due getting swelled head statements past year about great safety record has compared other RCers Ive included bit too July column first saw magazine picture modeler rope-starting big engine similar thoughts Als However being Big Bird flier didnt feel qualified make comment Now have experts field way make big engine pop use pulley rope starter let us Al & say forewarned tn regard Als comment about Big Bird lovers becoming somewhat lax safety because past good re cord dont think have data shows what record really exam ple know RCers fly big models versus models conventional Continued page 16 14 Model Aviation ADVANCED INTEGRATED CIRCUITRY U E~ ILK NUl lUll NOT JUST THE BEST CHOICE OF 40s THE ONLY CHOICE OF 40s HB Engines presents just 9reat 40 THREE Great 40s first time ever can buy just power need three engines give top performance made best German crafts manship give outstanding power FAI fuels HB ACCESSORIES Engine Back Radial Mounting Bracket used place crankcase back plate allows mounting engine directly firewall Part No 002606for HB40 HB50 Part No002607for HB61 Exhausf Stack Spacers increase muffler crankcase clearance Will fit HB Engines 4othrough 61 Part No002947provides 4 clearance Part No 0026g5provides 8 clearance Send Si 00 H B Patch Techn cal Infoemat 11151 LJ Power through Precision BAVARIAN PRECISION PRODUCTS CO P0 Box 6 Dept E 22 East Avenue Canaan Connecticut 06840 16 Model Aviation size Id venture say statistics would show isnt much difference safety record between big smallbut doubt could prove Whatever fly safety should prime con sideration Staying subject big models least use engines fueled gaso line note Jim Scarborough AMA vice-president District X enclosed article newsletter Orange Coast RC Club makes interesting reading article Bob Richards titled Happy Flying After reading might think Unhappy Flying would have better title Au Revoir CAP-20L gave us hours enjoyment article should really reported Marcs column Safety because firsthand expe rience want pass details Butch Asher Anaheim Model Air plane Club partners QuarterScale CAP-20 ever since Kenny Wilson let steal him over two years ago enjoyed participating events Mile Square Sepulveda Basin Las Vegas LTA Tustin desert outings just sport flying over 400 flights big bird Saturday April 2 1983 old F GAUA went big hangar sky right wing separated plane landing gear flying straight level 200 ft resulting crash understand truly spectacular am reporting particular demise model because object lessons learned hoping might save favorite planes No wing did fail because aileron flut ter post-crash investigation determined following conditions crack original fueling valve allowed gasoline leak fuselage over period time Also about year ago smoke system tubing failed caused one-time flooding diesel fuel fuselage fuel fumes apparently entered wing through servo lead wire opening wicked out wing spar end spar foam core turned soft gummy mass no structural integrity remaining insidious failure mode wasnt apparent pre-flight inspec dons What detected debonding sheeting core assumed glue deteriorating fact petroleum completely dissolved foam core lessons learned glow plug fuel methanol may cause problems Styrofoam gasoline diesel fuel will dissolve fast solvent avail able Secondly physical change characteristic model should investi gated depth just assumed obvious look inside wing mir ror light borescope might have saved $900 worth airplane Bobs story about soggy CAP-20 reContinued page 132 NB ENGINES HIT flu Accessory corn ner Nut Part No 002672torHB12HB1 Part No002671for HB20 larger Letters Editor Continued oaqe 10 power thermal gone Friends say radio prob lems perhaps shorted battery prefer think like real falcon set free just wanted try its wings interfer ence speck back groundwho will never know real joy flying Allan Belt Lexington KY picture shows Al Two-Meter Sailplane dubbed Green Side Up before fateful day think enjoy soaring whether RC pure Free Flight will see little themselves story Safety/Preston Continued page 16 minds water skiing expedition years ago friends boat During re fueling some drops gasoline spilled foam chest packed lunch Goodbye chestit just vanished fore very very eyes So have foamie eas-fueled motor up front take time thorough inspection regular basis lest too does disap pearing act because fuel spill Seldom does month pass reading about injury caused contact model aircraft propeller Most often result minor lacerationusually handbut sometimes such incidents ne cessitate trip doctor Such case account prop accident appeared Transmitter newsletter Jersey Coast Sport Elyers Ed Runkel editor As used say well-known TV show names have changed protect innocent disaster different nature recently befell Larry Modeler might call lightning does strike same place twice Two weeks ago Larry warming up engine prized new Aeromaster accidentally hit throttle some thing plane jumped him wooden prop stabbed deep leg few inches above knee Dick Samaritan took Larry house dress wound Bud Builder fixed wing damaged Larrys flailing arms Larry learned pain ful lesson End story quite Last Sunday turning car Thompson Park off Newman Springs Road noticed Dick Samaritans Volvo stopping way out Right behind Larry Modelers station wagon beeped horn say hello Larry distracted bumped rear Dicks car Dick jumped out Instead checking damage ran straight back Larry shouting Are alright couple seconds later Bud Builder pulled up getting out asking same question Out gets Larry grimacing pain holding knee Auto accident injury Nope Bud explained Larry gotten another prop leg time worse taking him Dicks maybe doctor Larry suffered considerably night next day went doctor took seven stitches sew back large flap meat nearly chopped leg inch 50 below earlier injury Larry also got tetanus shot told stay off leg two weeks Painfully re flecting occurrence Larry remembers revving up Webra Speed 61 engine Curare pit arca engine let out shrill whine next thing knew muffler spinner blew off down sharp pain leg con clusion blade hew off brand name prop Larry Mechanic calls fi berglass things steak knives will use things planes again 'The bratd name other brand name fiberglass props very popular items days cheaper wooden props perform about well air withstand ground impact better club does ban use issues warning sand off sharp edges paint tips light color make visible would add warning carefully balance before use admonition use highperformance engine flying Schnuerle-ported PDP engines good enough break props few pennies save glass-filled props worth opinion column has mentioned problems fiberglass-filled plastic props before would go further author pre ceding article caution modelers use engine larger 35 Balancing sanding off sharp edges painting tips light color good advicebut may have effect re ducing chance blade separation take chance wrap up months column have some tips might minimize risk injury yourself contact propeller tips come newsletter Thundervolts RC Club Schenec tady NY editors Rod Priddld Stan Devoe Club President John Saville authored following tips I Always move hands slowly deliberately near prop engine running 2 Always wear leather glove youre going prop hand An electric starter better 3 Black props extremely difficult see running Also glassfilled ones sharp very un forgiving try use possible 4 MOST IMPORTANTSet up standard arrangement equipment front plane use standard procedure start engine Work out avoid awkward moves situations 132 Model Aviation Nick Zirolis F4U CORSAIR 2 4 Cu size Engines Fiberglass Fuselage & Cowling available design GIANT RIC SCALE PLAN DESIGNS AT6 TEXAN24 1t01 Span$2700ppUSA FOKKER DRl27 I63 Trtpa$2500ppUSA PSP BEARCAT2186 Span$2700ppUSA CURTISS P402% 194 Span$2700ppUSA F4U CORSAiR2% I92 Spar02700ppUSA Fiberglass Cowlings & Canopies available also bend stamp detailed broobores 0000w Giant acate Avoessories Ocr Ptans sent Postpaid within USA BUILDS WING STAB & FU 5 CHOICE OF MODELERS THE WORLD OVER Standarduse-Jig00 Full House $7995 Wing JigK it$10Wing & Fuse Jig Ajustojig CoR R 1 Box 673Nobleoville Indiana 46060317] 877-2223 Whether consider yourself novice expert model builder A-i usto Jig will improve aircraft construc tion e valuable time bargain A-Justo-Jig holds major com ponents proper alignment entire unit will rotate 36O permit fit glue plank shape sand con venient position No messy glu ing over plans waiting dry before beginning opposite side A-Justo-Jig will adjust rib former spacing lets build-in wing dihedral strong warp-free construction TO USE simple template rib indexing tool included locate drill holes rib alignment rods easy preparation takes approx 15 minutes average wing A-i usto-Jig builds em better Ask favorite hobby dealer Youll glad did arantee use time 5 LastCarry small first aid kit car never know friend may need got caught friend gashed finger several weeks ago now have one' Have safe month John Preston 7012 Church VA 22042 Elsira Ct. Falls Fun/Winter Continued paqe 23 Slope Soarers wheel around track hands-off trimmed circle rock-steady skim along higher airspeeds case airfoil smallish wing area about 71 perhaps 81 aspect ratio thick al 15% dihedral five degrees CG fairly far forward three-channel controls no ailerons get steady turn on al titude loss doesnt spiral down less dihedral seems require repeat edly touching stick corrections Fin rudder position respect rolling axis aircraft magi cal mystical ingredient After lot vertical tail area above axis has leverage increase turn bank lower greater yaw effectiveness excessive coupling dihedral increase bank angle think Sal Taibis Spacer FE vertical tail bottom plane Vertical tail shape can concentrate area closer rolling axis Pattern people crate no wash outwhich sometimes spelled trouble variable gusty crosswind take offs Aloft held nose high edge stall right tip always would break rock crate straight flight strong updraft hit wing tip would tend stall its angle attack suddenly increased forcing ship turn quickly lift Always rightnever leftand speed would pick up requires stronger lift once has results out proportion expectations slow up nurse lift merely sinks through thinks ballasted Sailplanes cant conclude thick airfoil panacea 26-28 oz loading case high-lift section happens good match crate built lightly should have airfoil would have thin ner what happens airflow over airfoil changes angles load ings speeds size plane wander Dismal Swamp Reynolds Number flight purposethere purposes everything changes according what want flyit probable size roughly Eaglet down two turbulator spars rather sheet skinning back front spar could yield better results lighter weights both Eaglet parasol Electric mentioned have two turbulator spars am interested extended durations Both ships rather lightweight lower air speeds spars seem help Merely 1/8 squares small EF Rubber job seems have duration let rear edge leading edge act turbulator smooth rib con tours sheeting After great Rubber jobs came out Cleveland OHKorda Lanzo dozens oth ershad multiplicity light spars bending rearward match curved planform shapes outer panels Id prefer have answers wouldnt adventure P-49 Power eventonce bumblebee John Oldenkamp made Mad Test Pilot made first flight new 40/60 Krackerjac 6 ft K&B 40 just yesterday would have heard about bumblebee Krack erjac incidentally proved bit differ ent stab bottom short-coupled fuselage blast power retarding clump grass brings up Continued page 136 EeiFrhgpI 99-* KIT BUILDERS Lighten strengthen sent project factory processed graphite gtass balsa laminates * SCRATCH BUILDERS Design high-tech composites ultimate strength weight components yea Itat already familiar wITh MAGNALITE composItes try sample kIt includes CF 007 CF 014- Rigid graphite sheets CF 250 t /4 end grain balsa graphite laminate 08 125- t/t end grain balsa glass laminate GB 250- 1/4 end grain balsa glass laminate Graphite Rods- 075 1/4 diameter Brochore- Shows use composite Pefliat tinting st sizes prices available CF007n24S gog CF 014 5' o24StR00 CF2506o12 $1300 GB125 120 12 700 Ijromotinnai GB25012nt2$ 850 j saleprice Graphite1/4 n 24 51800 Rnds 075' n36' $455 Mitlodpiher110$ 750 Glass Balloons 1 gal5 6 50 New Sampie Kit 500 Rrnchure 5 100 VISA MASTERCARD COD CHECK OR MONEY ORDER Florida ResIdents Add 5% Sales Tao Add $300 Possage ling Salts ano Inlormation CENTRAL FLORIDA HOBBIES 4g1 State ho 434 monte Springs FloriOa 32701 Phone 3051 788-3718 Sam Leonard Proprietor September 1983 133

____first Svms RC frequency control rope-and-pulley starters Big Bang ers foam wing fails flight due creeping internal destruction gasoline fuel prop dangersand word caution some types plastic pro pellers John Preston GREAT response Two topics recently discussed column have gen erated readers let ters anything else has mentioned since Safety Comes First appeared January 1980 magazine two topics Frequency Control Flight Training Programs Im trying re spond took time write now summer its difficult keep up incoming mail hap pen writers subjects have yet receive acknowl edgement apologize Let thank now providing input keeps column alive Before leaving subject frequency control Id like mention two communica tions received during last month first letter Bill Hoffmeister Field Chairman Indianapolis RC South club came up frequency control board worth men tioning club uses additive control system member has disc his/her name side word guest other Before turning transmitter mem bers disc attached peg -in shoul der bolt board corresponds frequency used photograph shows layout board mem bers name disc tells other would-be users frequency guest flying word guest would exposed however turning disc over others can see guest flying Bills board covered /4-in Lexan protect elements suggestion others may wish copy design place numerical values indi vidual channels frequencies can seen members disc board same design could also used subtractive control system color-coded removable discs placed pegs would removed substituted members disc before flying second communication frequency control comes Gold Coast Flyer newsletter Art Johnson editor gives us something think about future Ultimate Frequency Control System think present club-card-for-the pin system pretty good sport continues grow popularity may looking sophisticated way job price no object current technology offers almost foolproof way solve several problems First want authorized persons fly sitewe want tie up frequency alloted time must make sure right frequency goals can accomplished bit electronic gadgetry First club members would issued cards mag netic code card frequency board slot frequency would tied multi-frequency spot jammer 100 mw jammer would put out signal frequency board jammer would turn sunrise shut off sunset effectively preventing flying site until member inserted coded card Continued page 14 12 Model Aviation John discusses frequency-control board column month Sorry cant let see colorcircles match transmit ter flag colors hang metal tag pin take turnlike Bill Hoff meister RC42 did . / /1/ /1/7 URE FHEYE NARD TO SEEI.. ur WWEY 005T LOT LESb7 1973 DAE Revolutionized Modeling Statement Now Battery Can ALL AGAIN DAE ADVANCES THE ART OF ELECTRONIC ENGINE STARTING LOW POWER CONSUMPTIONOnly 800 milliamps maximum battery drain SOLID 15v PLUG OUTPUTMaintains 15v starter LIGHTS ANY 11/2v PLUGAutomatically adjusts current plug needs EFFICIENT OPERATION tarter MARK V can also run 6v batter FEATURES AMERICAN MADE QUALITY PULSE DRIVER FOR ANY 1 v PLUG 6v 12v FUEL PUMP SUPPLY DIRECTIONAL PUMP FLOW SWITCHES 48v 96v FAST CHARGER AMMETER MONITORING PLUG CHARGER CONNECTING HARDWARE INCLUDED TWIN OWNERS MARK V lights 2 plugs NO ADJUSTMENTS Only $4795 Also Available Kit Form 5 SEE DEALER FIRSTADA Enterpflses unavailableOrder DirecthjdA ft. N. 3lZ 7U42S * * 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 PkJ2 InsertsCoarse $195 Cat No 204 Pkl2 Inserts Fine $195 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75C shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 frequency choice code would turn off jammer 15 minutes flight time could increased less busy periods warning signal would sound two minutes before time up light would flash frequency use light would go out card re moved signalling frequency available next flier such system feasible Sure think club will installing next week other hand would certainly keep everyone within present site rules wish comment Arts futuristic system suggest write him AMA HQ rather As said before Im already way behind responses mailand wasnt wouldnt touch proverbial 10-ft pole Coming back reality turning subject Giant models letter last month came other Al Big Bird Alman according business card specializes Gimbals Hot Stuffed Judges Bribed Inflight Wing Removals Buddy Cords Cut Batteries Drained Schnuerle Ported Windsocks Al no doubt know also writes Big Bird column Model Builder magazine July 1983 issue touches same safety issue letter namely use rope starters large en gines Over Al Something feel gross safety vio lation no has yet mentioned fi nally did address problem July column practice some have hard-starting hand Evras Ropers utilize rope starter idea having pulley immediately front back prop rope close sends chills up down spine Someone going get hacked death handle end rope may very well end up being bystander What weapon rope would make being whirled around spinning prop Gad AlsoI feel some Big Bird lovers have slacked off bit regards safety think due getting swelled head statements past year about great safety record has compared other RCers Ive included bit too July column first saw magazine picture modeler rope-starting big engine similar thoughts Als However being Big Bird flier didnt feel qualified make comment Now have experts field way make big engine pop use pulley rope starter let us Al & say forewarned tn regard Als comment about Big Bird lovers becoming somewhat lax safety because past good re cord dont think have data shows what record really exam ple know RCers fly big models versus models conventional Continued page 16 14 Model Aviation ADVANCED INTEGRATED CIRCUITRY U E~ ILK NUl lUll NOT JUST THE BEST CHOICE OF 40s THE ONLY CHOICE OF 40s HB Engines presents just 9reat 40 THREE Great 40s first time ever can buy just power need three engines give top performance made best German crafts manship give outstanding power FAI fuels HB ACCESSORIES Engine Back Radial Mounting Bracket used place crankcase back plate allows mounting engine directly firewall Part No 002606for HB40 HB50 Part No002607for HB61 Exhausf Stack Spacers increase muffler crankcase clearance Will fit HB Engines 4othrough 61 Part No002947provides 4 clearance Part No 0026g5provides 8 clearance Send Si 00 H B Patch Techn cal Infoemat 11151 LJ Power through Precision BAVARIAN PRECISION PRODUCTS CO P0 Box 6 Dept E 22 East Avenue Canaan Connecticut 06840 16 Model Aviation size Id venture say statistics would show isnt much difference safety record between big smallbut doubt could prove Whatever fly safety should prime con sideration Staying subject big models least use engines fueled gaso line note Jim Scarborough AMA vice-president District X enclosed article newsletter Orange Coast RC Club makes interesting reading article Bob Richards titled Happy Flying After reading might think Unhappy Flying would have better title Au Revoir CAP-20L gave us hours enjoyment article should really reported Marcs column Safety because firsthand expe rience want pass details Butch Asher Anaheim Model Air plane Club partners QuarterScale CAP-20 ever since Kenny Wilson let steal him over two years ago enjoyed participating events Mile Square Sepulveda Basin Las Vegas LTA Tustin desert outings just sport flying over 400 flights big bird Saturday April 2 1983 old F GAUA went big hangar sky right wing separated plane landing gear flying straight level 200 ft resulting crash understand truly spectacular am reporting particular demise model because object lessons learned hoping might save favorite planes No wing did fail because aileron flut ter post-crash investigation determined following conditions crack original fueling valve allowed gasoline leak fuselage over period time Also about year ago smoke system tubing failed caused one-time flooding diesel fuel fuselage fuel fumes apparently entered wing through servo lead wire opening wicked out wing spar end spar foam core turned soft gummy mass no structural integrity remaining insidious failure mode wasnt apparent pre-flight inspec dons What detected debonding sheeting core assumed glue deteriorating fact petroleum completely dissolved foam core lessons learned glow plug fuel methanol may cause problems Styrofoam gasoline diesel fuel will dissolve fast solvent avail able Secondly physical change characteristic model should investi gated depth just assumed obvious look inside wing mir ror light borescope might have saved $900 worth airplane Bobs story about soggy CAP-20 reContinued page 132 NB ENGINES HIT flu Accessory corn ner Nut Part No 002672torHB12HB1 Part No002671for HB20 larger Letters Editor Continued oaqe 10 power thermal gone Friends say radio prob lems perhaps shorted battery prefer think like real falcon set free just wanted try its wings interfer ence speck back groundwho will never know real joy flying Allan Belt Lexington KY picture shows Al Two-Meter Sailplane dubbed Green Side Up before fateful day think enjoy soaring whether RC pure Free Flight will see little themselves story Safety/Preston Continued page 16 minds water skiing expedition years ago friends boat During re fueling some drops gasoline spilled foam chest packed lunch Goodbye chestit just vanished fore very very eyes So have foamie eas-fueled motor up front take time thorough inspection regular basis lest too does disap pearing act because fuel spill Seldom does month pass reading about injury caused contact model aircraft propeller Most often result minor lacerationusually handbut sometimes such incidents ne cessitate trip doctor Such case account prop accident appeared Transmitter newsletter Jersey Coast Sport Elyers Ed Runkel editor As used say well-known TV show names have changed protect innocent disaster different nature recently befell Larry Modeler might call lightning does strike same place twice Two weeks ago Larry warming up engine prized new Aeromaster accidentally hit throttle some thing plane jumped him wooden prop stabbed deep leg few inches above knee Dick Samaritan took Larry house dress wound Bud Builder fixed wing damaged Larrys flailing arms Larry learned pain ful lesson End story quite Last Sunday turning car Thompson Park off Newman Springs Road noticed Dick Samaritans Volvo stopping way out Right behind Larry Modelers station wagon beeped horn say hello Larry distracted bumped rear Dicks car Dick jumped out Instead checking damage ran straight back Larry shouting Are alright couple seconds later Bud Builder pulled up getting out asking same question Out gets Larry grimacing pain holding knee Auto accident injury Nope Bud explained Larry gotten another prop leg time worse taking him Dicks maybe doctor Larry suffered considerably night next day went doctor took seven stitches sew back large flap meat nearly chopped leg inch 50 below earlier injury Larry also got tetanus shot told stay off leg two weeks Painfully re flecting occurrence Larry remembers revving up Webra Speed 61 engine Curare pit arca engine let out shrill whine next thing knew muffler spinner blew off down sharp pain leg con clusion blade hew off brand name prop Larry Mechanic calls fi berglass things steak knives will use things planes again 'The bratd name other brand name fiberglass props very popular items days cheaper wooden props perform about well air withstand ground impact better club does ban use issues warning sand off sharp edges paint tips light color make visible would add warning carefully balance before use admonition use highperformance engine flying Schnuerle-ported PDP engines good enough break props few pennies save glass-filled props worth opinion column has mentioned problems fiberglass-filled plastic props before would go further author pre ceding article caution modelers use engine larger 35 Balancing sanding off sharp edges painting tips light color good advicebut may have effect re ducing chance blade separation take chance wrap up months column have some tips might minimize risk injury yourself contact propeller tips come newsletter Thundervolts RC Club Schenec tady NY editors Rod Priddld Stan Devoe Club President John Saville authored following tips I Always move hands slowly deliberately near prop engine running 2 Always wear leather glove youre going prop hand An electric starter better 3 Black props extremely difficult see running Also glassfilled ones sharp very un forgiving try use possible 4 MOST IMPORTANTSet up standard arrangement equipment front plane use standard procedure start engine Work out avoid awkward moves situations 132 Model Aviation Nick Zirolis F4U CORSAIR 2 4 Cu size Engines Fiberglass Fuselage & Cowling available design GIANT RIC SCALE PLAN DESIGNS AT6 TEXAN24 1t01 Span$2700ppUSA FOKKER DRl27 I63 Trtpa$2500ppUSA PSP BEARCAT2186 Span$2700ppUSA CURTISS P402% 194 Span$2700ppUSA F4U CORSAiR2% I92 Spar02700ppUSA Fiberglass Cowlings & Canopies available also bend stamp detailed broobores 0000w Giant acate Avoessories Ocr Ptans sent Postpaid within USA BUILDS WING STAB & FU 5 CHOICE OF MODELERS THE WORLD OVER Standarduse-Jig00 Full House $7995 Wing JigK it$10Wing & Fuse Jig Ajustojig CoR R 1 Box 673Nobleoville Indiana 46060317] 877-2223 Whether consider yourself novice expert model builder A-i usto Jig will improve aircraft construc tion e valuable time bargain A-Justo-Jig holds major com ponents proper alignment entire unit will rotate 36O permit fit glue plank shape sand con venient position No messy glu ing over plans waiting dry before beginning opposite side A-Justo-Jig will adjust rib former spacing lets build-in wing dihedral strong warp-free construction TO USE simple template rib indexing tool included locate drill holes rib alignment rods easy preparation takes approx 15 minutes average wing A-i usto-Jig builds em better Ask favorite hobby dealer Youll glad did arantee use time 5 LastCarry small first aid kit car never know friend may need got caught friend gashed finger several weeks ago now have one' Have safe month John Preston 7012 Church VA 22042 Elsira Ct. Falls Fun/Winter Continued paqe 23 Slope Soarers wheel around track hands-off trimmed circle rock-steady skim along higher airspeeds case airfoil smallish wing area about 71 perhaps 81 aspect ratio thick al 15% dihedral five degrees CG fairly far forward three-channel controls no ailerons get steady turn on al titude loss doesnt spiral down less dihedral seems require repeat edly touching stick corrections Fin rudder position respect rolling axis aircraft magi cal mystical ingredient After lot vertical tail area above axis has leverage increase turn bank lower greater yaw effectiveness excessive coupling dihedral increase bank angle think Sal Taibis Spacer FE vertical tail bottom plane Vertical tail shape can concentrate area closer rolling axis Pattern people crate no wash outwhich sometimes spelled trouble variable gusty crosswind take offs Aloft held nose high edge stall right tip always would break rock crate straight flight strong updraft hit wing tip would tend stall its angle attack suddenly increased forcing ship turn quickly lift Always rightnever leftand speed would pick up requires stronger lift once has results out proportion expectations slow up nurse lift merely sinks through thinks ballasted Sailplanes cant conclude thick airfoil panacea 26-28 oz loading case high-lift section happens good match crate built lightly should have airfoil would have thin ner what happens airflow over airfoil changes angles load ings speeds size plane wander Dismal Swamp Reynolds Number flight purposethere purposes everything changes according what want flyit probable size roughly Eaglet down two turbulator spars rather sheet skinning back front spar could yield better results lighter weights both Eaglet parasol Electric mentioned have two turbulator spars am interested extended durations Both ships rather lightweight lower air speeds spars seem help Merely 1/8 squares small EF Rubber job seems have duration let rear edge leading edge act turbulator smooth rib con tours sheeting After great Rubber jobs came out Cleveland OHKorda Lanzo dozens oth ershad multiplicity light spars bending rearward match curved planform shapes outer panels Id prefer have answers wouldnt adventure P-49 Power eventonce bumblebee John Oldenkamp made Mad Test Pilot made first flight new 40/60 Krackerjac 6 ft K&B 40 just yesterday would have heard about bumblebee Krack erjac incidentally proved bit differ ent stab bottom short-coupled fuselage blast power retarding clump grass brings up Continued page 136 EeiFrhgpI 99-* KIT BUILDERS Lighten strengthen sent project factory processed graphite gtass balsa laminates * SCRATCH BUILDERS Design high-tech composites ultimate strength weight components yea Itat already familiar wITh MAGNALITE composItes try sample kIt includes CF 007 CF 014- Rigid graphite sheets CF 250 t /4 end grain balsa graphite laminate 08 125- t/t end grain balsa glass laminate GB 250- 1/4 end grain balsa glass laminate Graphite Rods- 075 1/4 diameter Brochore- Shows use composite Pefliat tinting st sizes prices available CF007n24S gog CF 014 5' o24StR00 CF2506o12 $1300 GB125 120 12 700 Ijromotinnai GB25012nt2$ 850 j saleprice Graphite1/4 n 24 51800 Rnds 075' n36' $455 Mitlodpiher110$ 750 Glass Balloons 1 gal5 6 50 New Sampie Kit 500 Rrnchure 5 100 VISA MASTERCARD COD CHECK OR MONEY ORDER Florida ResIdents Add 5% Sales Tao Add $300 Possage ling Salts ano Inlormation CENTRAL FLORIDA HOBBIES 4g1 State ho 434 monte Springs FloriOa 32701 Phone 3051 788-3718 Sam Leonard Proprietor September 1983 133