& ~ John PrestonPrr Cl Boron fibers Pro Con An board battery tester RC Increase reliability RC systems Off Switch CRARGER CHARGER CH 9 0 CONVENTiONAL SWITCH WIRING HH H H HI2 H ERNATIVE SWITCH WIRING BAD STUFF June 1985 Safety column included discussion whether models containing boron fIlament should banned AMA-sanctioned compe titions because allegations concerning safety product also asked readers answers two questions 1 Should models containing boron outlawed AMA competition categories 2 Should models contain ing boron outlawed certain AMA competition categories categories Thirteen readers kind enough re spond questions addition al reader didnt specifically respond questions sent letter safely handle boron filament 13 cast vote nine did want see boron banned four responded yes question No 1 meaning models containing boron should permitted AMA competition category guess predicted outcome ballot because general Americans like have somebody dictating rules person al safety good example outside modeling world unpopularity mandatory automobile-seat-belt-usage laws have adopted some state governments its hide theyre trying protect part youd rather make decisions affect ing own safety yourself So will boron models members AMA Safety Committee read ing column vote keep boron because possible competitive ad vantage can bring model because its light weight combined high strength reader uses boron filament flying wires 1/72-scale non-flying models another Sailplane enthusiast sent letters giving some tips handle boron safely Excerpts letters follow planes RC installation known wiring harnesses have switch wired depicted diagram left possibility exists short circuits switch Rewiring switch shown right aimost completely cilminates possibility internal shorts well greatly increasing reliability switch itself Both HA Farrar son op posed banning boron despite fact have experienced splinters flesh HAs letter states Boron deposited 00005-in tungsten filament diameter 0004 relatively stiff hard BRIT TLE boron/epoxy laminate best machined trimmed diamond-grit cutting tools essentially grinding opera tion individual filaments cannot cut blade breaks somewhat similar cutting piano wire diagonal cutters problem unlike wire addition desired break secon dary break occurs approximately 006 away desired break either direction depending little unobserved piece gets hand 16 Model Aviation e . fV V ThA11K3 F5R LETTIN ME HELP LAUNCH VOUR NEW PLANE NARYAN THl THINIG- FELL OUT JU3T 8BFORE L5T ER C7rO or footand dont get chair diameter stiffness fila ment permits function like needle its brittleness can leave piece inside flesh Hand lay-up boron/epoxy tape better performed bare-handed gloves gloves assist small segments penetrating skin diameter color render small pieces virtually invisible anything plain light-colored surface HA wound up letter PS suggested .. on boron rug March 1985 safety col umn should chuck rug wear shoes other letter tips han dle boron came Harley Michaelis must Sailplane flier since put LSF number 023 after signature Harley did respond questions whether boron should banned what stated following let ter Im assuming would want see ban response article boron June 1985 MA comment directed question banning banning safely han dle stuff caution usually sounded little said about actual tech nique bungling experiences may common subsequent solutions may interest others first experience consisted trans ferring 200 feet stuff reel 1000 feet owned friend taped end plastic gallon jug attempted wind reel unwound brittle stuff kept break ing bits pieces flew everywhere Relocating retaping two loose ends jug common fingers im paled general transfer bad experience No doubt sharp bits unknowingly ended up floor cause future trouble ran dowel through jug its ends supported wires dangling low ceiling workshop means dispensing boron idea use stick gauge lengths needed break off pieces Unwanted breaks common pieces flew loose end jug went wild fingers run through Fingers boron structure joined CyA actual application structure crude unwanted slack filaments Except wish get strength wings would have abandoned whole idea view use boron presents following problems 1 need finger eye protection 2 Storing reel will wildly unwind unless end taped 3 Dispensing breaking off lengths desired 4 Keeping abso lute track loose shards safely disposing 5 Proper alignment positioning filaments struc ture 6 Attaching filaments structure store reel made shallow box put width about reel diameter -in dowel centered box reel turn edge box drilled hole end boron pass through dispense practice box laid workbench near model structure Plans white paper placed under structure background dark boron Eye protection worn breaking off pieces As length pulled mobile dispenser broken off smooth-jawed pliers hand covered white Kleenex held over pliers breaking commonly results tiny loose shards will Kleenex work surface can seen After break Kleenex white surface pliers should inspected shards may captured masking tape covers problems through four problem five length brok en off laid other pieces set ends raised up shim desired number filaments has laid down can picked up group between thumb forefinger hand Let dangle alter nately stroke thumb forefin ger hand get side side Continued page 18 September1985 17 TEXXON FtELD BOXES ARE MANUFACTURED FROM SELECTED PLYWOOD SANDED STAINED FINISHED MANY EXTRA FEATURES ARE INCLUDED IN EACH BOX SPECIAL FEATURES DELUXE CUSTOM BOX INCLUDES Power take out box wilt hold starter battery well tool storage Folding legs Adjustable folding locking tuselage holder Wing caddy tool drawers STARTER POWER PANEL NOT INCLUDED N 9 Oder Add 5250 tor Insaracce handting MasterCardEny Daleorder COD enclose payment 01ChecklMOplease send wy VwaHOBBIES CardNOAdd$200PO BOX 421160 MtAMt FLA 33242 THANK YOU FOR YOUR ORDER PHONE 305 638-4197 K. ing both ends group filaments laid structure Any new overlaps bows can worked out fingertips smoothing center towards ends until filaments straight side-by-side Pins can placed structure help position filaments attaching filaments structure after posi tioning drop thin CyA glue first applied center group secure structure Drops progressively applied center towards ends being left wick cure before another drop applied avoid excess glue Accelerator used can cause bumps cured CyA Bare fingers never placed boron glue wicking never run back against raw ends filaments touched during wick ing something like contoured piece Tupperware bit backing cov ering film used finger protection boron must encased provide maximum increase spar strength typical D-box panel construction fila ments can applied bottom sheeting bottom spar added sandwich filaments After webbing top spar goes filaments added filaments sandwiched top sheeting slow CyA epoxy can used make lamination held under straightedge curing John opinion procedures have made boron relatively easy safe work D-box wings certainly stiffer contribute safety virtue less likelihood collapse under stress readers may find information beneficial last word exotic building materials concerns carbon fibers Although previously published letter April 1985 Safety column reader finger pierced carbon fibers experts tell fibers order magnitude safer handle boron Apparently hazard running finger along edge carbon fiber/epoxy laminate about equal hazard running finger along edge rough-sawn piece plywood Smart people just dont think RC modelers will agree vulnerable component models radio control system battery pack Without power its batteries model just isnt going respond control inputs letter Jesse Aronstein told about new product specifically intended provide convenient means checking state charge models on-board batter ies product known Batt Check RX-l marketed Protune Corporation company Jesse start ed order market electronic musi Continued page 20 18 Model Aviation NEW MK 2 H & K SUPER STARTERS Look before YOU leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $t 50 postage handling Z495 $3295 $3995 Dealers Inquiries invited jinmflIMN91JJ9]DJMWNW~ CHECK THESE FEATURES THEN COMPAREII High Rim Strength Lubricant spe cial additives increase lubri city extreme pressure character istics oil Viscosity index Improvers insure proper lubrication high RPM high temperatures WettIng Agents increase plating action oil SpecIal Detergents cut power rob bing varnish Anti-Foam AddItives prevent high RPM lean-out Rust Preventatlves protect expensive engines Highest Qusilty Ingredients insure top engine performance reliability Sheldons Au New Super-Sport Fueis specisi blend Nitros lower hying costs insure long engine life have lowered oil content oh fuel formuistions Type Nitro 0/ Lubricant1-4 Gal 5-23 Gal 2443 Gal 64-123 Gal 124 Gal FAIQ5/ Synthetic$675$595$550$525$495 5s55/s Synthetic$775$695$675$650$595 Sc5/o Castor$775$695$675$650$595 lOs10% Synthetic$895$819$795$775$750 lOc10/o Castor$895$819$795$775$750 R/C 121/2% Syn/Castar $995$919$875$850$795 iSs15/s Synthetic$995$919$8 75$850$795 4-cyc 7% Castor/Syn $850$7 95$7 75$750$695 4-cyc 15% Castor/Syn $995$9 19$875$850$795 10/s SUPER SPORT$795$695$650$625$595 15/s R SPORT$895$795$750$725$695 10/s SUPER SPORT 4-cycle$795$695$650$625$595 SHELDONS HOBBY SHOP 3157 Alum Rock Avenue Jose California 95127 Out State FOR ORDERS CALL California 800 228-3237 408 251-0789 For Information Call 408 2518686 Hours Mon Wed Fri & Sat 9 305 30 Thur 930900 Sun 1200500 M/C VISA 123 Gai via UPS 24-124 Gal via truck freight PAID UPS COD OK- $190 $300 Handling per fuel order ...EEEEEEEEEEEEE cal instrument tunerhence company name description Batt-Chek contained March 1985 issue Flight Line newsletter MidHudson RC Society excerpts follows Batt-Chek low-battery warning device developed on-board use RC model airplanes cars boats weighs less 1/2 ounce measures approximately 1Y~ x 7/ x %- thick installed model shows battery pack condition means two bright LEDs press-to-test pushbutton switch gives three-level indication battery pack status follows OK Green LED battery pack ex ceeds 495 V 01 Amp load GEFrING LOW Red Green LEDs both Battery Pack between 48 V 495 V 01 DANGER Red LED battery pack less 48 V 01 case asking what advantage Batt-Chek might have over ESV meter opinion because intend ed installed permanently model likely use before flight comes adhesive-backed foam tape mounting inside sur face fuselage two small holes side fuselage permit LEDs protrude Alternatively could mounted behind instrument panel open-cockpit model pressto-test button panel itself Batt Chek lists $1495 complete can obtained Protune Corp 50 Pasture Lane Poughkeepsie NY 12603 phone 914 462-6452 Jesse also has suggestion reduce possibility short circuits flight pack switch see incident reported June 1985 Safety column suggestion also has secondary benefit should increase reliability connections made switch contacts Somewhere col umn will find electrical schematic shows conventional method wiring switch together Jesses sug gested alternative method wiring switch routing side battery power through switch probability short switch reduced Switch contact reliability creased wiring two poles double-pole switch parallel Thus normal operation set switch con tacts redundant provides backup case poor no contact other set Staying subject airbornebattery-pack failure back February 1985 Safety column reported case 1A-Scale flyaway resulted unintentional ejection battery pack takeoff time stated didnt know device market would automatically close throttle upon loss battery power Jim Tagg Pittsburgh PA wrote drew attention previous article MA addressed just issue help Associate Editor Ross McMullen have found article George Myers Radio Technique column January 1983 issue MA Georges arti cle concerned Helicopters applies equally well fixed-wing models case dont save back issues MA following Georges suggestion simple spring may provide answer need use throttle has very low friction could also use ball-bearing coreless-motor throttle servo Such throttles servos can rather easily fitted spring working Off throttle closed irection Once battery voltage removed spring can overpower servo coreless motor servos offer almost no resistance power off engine will stop dont know what constantly run ning against spring load will servo seems reasonable expect some reduction useful life Only time some tests will tell whether such reduction significant readers have comments make suggestion make throttle fail-safe event elec trical power loss would rather send George Myers George Continued page 115 20Model Aviation model craft TOUCH UP AIR BRUSH ARISTO TEX COVERING MATERIAL LOW 2 METER ROLL $720 FOR DETAIL PAINTING OF AIRPLANE WINGS AND BOATS$4000 TACHOMElER W/LED READ OUT FOR EASY FIELD READING $4j rjj ACCURATE ENGINE RPM 12 PIECE WOOD CARVING SET HOBBYISTS/I QUICK HEAT SOLDERING GUN iPO WATT 21 PIECE TOOL SET US SIZE SCREWDRIVERS PLUS PHILLIPS HEX AND WRENCH TYPES $700 Ci TRIPLE HANDS WITH MAGNIFIER N EXTRA HELP IN ma HOLDING THOSEW SMALL PARTS WHILE$5 SOLDERING GLUING OR PAINTING MAGNIFIER LAMP WITH MULTI POSITION 39 $3000 / FLEXIBLE ARM 3 DIOPTER LENS FOR 4 liMES MAGNIFICATION Letters Editor Continued page 113 modeling interests first article would like comment guest editorial believe Mr Waterman expressed views ac tive instructors very well us spend flying time teaching others fly know what happens student pilot brings out wrong airplane takes twice long him learn fly dont believe however student cannot learn ship has ailerons Take Goldberg Eaglet example sincerely believe probably best trainer market have taught lots folks fly ailerons definitely hinderance learning process dont feel need go back days Smog Hog applaud Mr Watermans views keeping things simple beginner Anthony Stevens Knoxville TN am writing overwhelming apprecia tion guest editorial April 1985 issue Jim Waterman really enoyed Frankly stand behind him 100% Let explain first trainer Little Stik 6-ft wing flatbottomed airfoil polydihedral 576 sq area truly basic trainer would recover full stall about 10 ft plane crashed servo arm rudder came off turn left full rudder locked-in friend gave Box Fly 20 put big wing it flew better Loops spins snaps could flown yet stable Old-Timer wing broke using glider fuselage switched nodihedral fully-symmetrical-airfoil wing ailerons needed larger power plant got wasnt ready second airplane guest editorial called bumped about quite bit During winter fixed up after wards could fly much better However still herkey-jerkey ailerons doing better before crashed five times first switched ailerons took year lots patience really bruised ego learn tt fly Dont think stayed basic trainer never crashed due pilot error would have faster learning session Its good thing really love RCing because greenhorns would have given up long time ago Chris Allen Pittsburg CA Although enjoy Model Aviation disappointed aggravated totally honest little mad after reading guest editorial April 1985 edition got impression guest editor little envious skill level required fly Pattern Racing ship particularly disturbed remark us fly Pattern Racing models cannot under stand needs beginners us start somewhere us successful first flying session totally mishaps save breaking couple props hangup Antic Bipes Sopwith Pups fine Go sport enjoy covers variety aircraft types varying skill requirements Once beginner present have six trainees has reached skill level competently fly trainer respect choice models continue assist long think needs Instructors determined type aircraft fly Instructors born David C Lassiter Aulander NC Safety/Preston Continued page 20 radio expert among contributing editors Model Aviation last comment concerns radio inter ference Im also going buck George Myers Ive several let ters asking opinion RC chan nels should avoided because inter ference other channels really dont know answer However Radio Technique column ap peared April 1985 issue page 40 George did mention subject radio interference also referenced number previous columns discussed subject have ques tions about interference first check back issues magazine may find answers seek Also dont forget District Frequency Coordina tor people appointed pin point local problems names addresses can found head District VPs column AMA News section magazine Have another safe month John Preston 12235 Tilden wood Dr Rockville MD 20852 M lies-Atwood/Reese Continued page 30 airplane flew nicely another 30 seconds little nervous looped rolled about sky little green airplane needed just another foot altitude complete split-S told just wasnt day inspection didnt appear badly damaged landing gear bent lower cowl popped loose nothing else appeared broken repaired cowl 5-mm epoxy tried again time going touch As soon airbne Continued page 118 September 1985115
Edition: Model Aviation - 1985/09
Page Numbers: 16, 17, 18, 20, 115
& ~ John PrestonPrr Cl Boron fibers Pro Con An board battery tester RC Increase reliability RC systems Off Switch CRARGER CHARGER CH 9 0 CONVENTiONAL SWITCH WIRING HH H H HI2 H ERNATIVE SWITCH WIRING BAD STUFF June 1985 Safety column included discussion whether models containing boron fIlament should banned AMA-sanctioned compe titions because allegations concerning safety product also asked readers answers two questions 1 Should models containing boron outlawed AMA competition categories 2 Should models contain ing boron outlawed certain AMA competition categories categories Thirteen readers kind enough re spond questions addition al reader didnt specifically respond questions sent letter safely handle boron filament 13 cast vote nine did want see boron banned four responded yes question No 1 meaning models containing boron should permitted AMA competition category guess predicted outcome ballot because general Americans like have somebody dictating rules person al safety good example outside modeling world unpopularity mandatory automobile-seat-belt-usage laws have adopted some state governments its hide theyre trying protect part youd rather make decisions affect ing own safety yourself So will boron models members AMA Safety Committee read ing column vote keep boron because possible competitive ad vantage can bring model because its light weight combined high strength reader uses boron filament flying wires 1/72-scale non-flying models another Sailplane enthusiast sent letters giving some tips handle boron safely Excerpts letters follow planes RC installation known wiring harnesses have switch wired depicted diagram left possibility exists short circuits switch Rewiring switch shown right aimost completely cilminates possibility internal shorts well greatly increasing reliability switch itself Both HA Farrar son op posed banning boron despite fact have experienced splinters flesh HAs letter states Boron deposited 00005-in tungsten filament diameter 0004 relatively stiff hard BRIT TLE boron/epoxy laminate best machined trimmed diamond-grit cutting tools essentially grinding opera tion individual filaments cannot cut blade breaks somewhat similar cutting piano wire diagonal cutters problem unlike wire addition desired break secon dary break occurs approximately 006 away desired break either direction depending little unobserved piece gets hand 16 Model Aviation e . fV V ThA11K3 F5R LETTIN ME HELP LAUNCH VOUR NEW PLANE NARYAN THl THINIG- FELL OUT JU3T 8BFORE L5T ER C7rO or footand dont get chair diameter stiffness fila ment permits function like needle its brittleness can leave piece inside flesh Hand lay-up boron/epoxy tape better performed bare-handed gloves gloves assist small segments penetrating skin diameter color render small pieces virtually invisible anything plain light-colored surface HA wound up letter PS suggested .. on boron rug March 1985 safety col umn should chuck rug wear shoes other letter tips han dle boron came Harley Michaelis must Sailplane flier since put LSF number 023 after signature Harley did respond questions whether boron should banned what stated following let ter Im assuming would want see ban response article boron June 1985 MA comment directed question banning banning safely han dle stuff caution usually sounded little said about actual tech nique bungling experiences may common subsequent solutions may interest others first experience consisted trans ferring 200 feet stuff reel 1000 feet owned friend taped end plastic gallon jug attempted wind reel unwound brittle stuff kept break ing bits pieces flew everywhere Relocating retaping two loose ends jug common fingers im paled general transfer bad experience No doubt sharp bits unknowingly ended up floor cause future trouble ran dowel through jug its ends supported wires dangling low ceiling workshop means dispensing boron idea use stick gauge lengths needed break off pieces Unwanted breaks common pieces flew loose end jug went wild fingers run through Fingers boron structure joined CyA actual application structure crude unwanted slack filaments Except wish get strength wings would have abandoned whole idea view use boron presents following problems 1 need finger eye protection 2 Storing reel will wildly unwind unless end taped 3 Dispensing breaking off lengths desired 4 Keeping abso lute track loose shards safely disposing 5 Proper alignment positioning filaments struc ture 6 Attaching filaments structure store reel made shallow box put width about reel diameter -in dowel centered box reel turn edge box drilled hole end boron pass through dispense practice box laid workbench near model structure Plans white paper placed under structure background dark boron Eye protection worn breaking off pieces As length pulled mobile dispenser broken off smooth-jawed pliers hand covered white Kleenex held over pliers breaking commonly results tiny loose shards will Kleenex work surface can seen After break Kleenex white surface pliers should inspected shards may captured masking tape covers problems through four problem five length brok en off laid other pieces set ends raised up shim desired number filaments has laid down can picked up group between thumb forefinger hand Let dangle alter nately stroke thumb forefin ger hand get side side Continued page 18 September1985 17 TEXXON FtELD BOXES ARE MANUFACTURED FROM SELECTED PLYWOOD SANDED STAINED FINISHED MANY EXTRA FEATURES ARE INCLUDED IN EACH BOX SPECIAL FEATURES DELUXE CUSTOM BOX INCLUDES Power take out box wilt hold starter battery well tool storage Folding legs Adjustable folding locking tuselage holder Wing caddy tool drawers STARTER POWER PANEL NOT INCLUDED N 9 Oder Add 5250 tor Insaracce handting MasterCardEny Daleorder COD enclose payment 01ChecklMOplease send wy VwaHOBBIES CardNOAdd$200PO BOX 421160 MtAMt FLA 33242 THANK YOU FOR YOUR ORDER PHONE 305 638-4197 K. ing both ends group filaments laid structure Any new overlaps bows can worked out fingertips smoothing center towards ends until filaments straight side-by-side Pins can placed structure help position filaments attaching filaments structure after posi tioning drop thin CyA glue first applied center group secure structure Drops progressively applied center towards ends being left wick cure before another drop applied avoid excess glue Accelerator used can cause bumps cured CyA Bare fingers never placed boron glue wicking never run back against raw ends filaments touched during wick ing something like contoured piece Tupperware bit backing cov ering film used finger protection boron must encased provide maximum increase spar strength typical D-box panel construction fila ments can applied bottom sheeting bottom spar added sandwich filaments After webbing top spar goes filaments added filaments sandwiched top sheeting slow CyA epoxy can used make lamination held under straightedge curing John opinion procedures have made boron relatively easy safe work D-box wings certainly stiffer contribute safety virtue less likelihood collapse under stress readers may find information beneficial last word exotic building materials concerns carbon fibers Although previously published letter April 1985 Safety column reader finger pierced carbon fibers experts tell fibers order magnitude safer handle boron Apparently hazard running finger along edge carbon fiber/epoxy laminate about equal hazard running finger along edge rough-sawn piece plywood Smart people just dont think RC modelers will agree vulnerable component models radio control system battery pack Without power its batteries model just isnt going respond control inputs letter Jesse Aronstein told about new product specifically intended provide convenient means checking state charge models on-board batter ies product known Batt Check RX-l marketed Protune Corporation company Jesse start ed order market electronic musi Continued page 20 18 Model Aviation NEW MK 2 H & K SUPER STARTERS Look before YOU leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $t 50 postage handling Z495 $3295 $3995 Dealers Inquiries invited jinmflIMN91JJ9]DJMWNW~ CHECK THESE FEATURES THEN COMPAREII High Rim Strength Lubricant spe cial additives increase lubri city extreme pressure character istics oil Viscosity index Improvers insure proper lubrication high RPM high temperatures WettIng Agents increase plating action oil SpecIal Detergents cut power rob bing varnish Anti-Foam AddItives prevent high RPM lean-out Rust Preventatlves protect expensive engines Highest Qusilty Ingredients insure top engine performance reliability Sheldons Au New Super-Sport Fueis specisi blend Nitros lower hying costs insure long engine life have lowered oil content oh fuel formuistions Type Nitro 0/ Lubricant1-4 Gal 5-23 Gal 2443 Gal 64-123 Gal 124 Gal FAIQ5/ Synthetic$675$595$550$525$495 5s55/s Synthetic$775$695$675$650$595 Sc5/o Castor$775$695$675$650$595 lOs10% Synthetic$895$819$795$775$750 lOc10/o Castor$895$819$795$775$750 R/C 121/2% Syn/Castar $995$919$875$850$795 iSs15/s Synthetic$995$919$8 75$850$795 4-cyc 7% Castor/Syn $850$7 95$7 75$750$695 4-cyc 15% Castor/Syn $995$9 19$875$850$795 10/s SUPER SPORT$795$695$650$625$595 15/s R SPORT$895$795$750$725$695 10/s SUPER SPORT 4-cycle$795$695$650$625$595 SHELDONS HOBBY SHOP 3157 Alum Rock Avenue Jose California 95127 Out State FOR ORDERS CALL California 800 228-3237 408 251-0789 For Information Call 408 2518686 Hours Mon Wed Fri & Sat 9 305 30 Thur 930900 Sun 1200500 M/C VISA 123 Gai via UPS 24-124 Gal via truck freight PAID UPS COD OK- $190 $300 Handling per fuel order ...EEEEEEEEEEEEE cal instrument tunerhence company name description Batt-Chek contained March 1985 issue Flight Line newsletter MidHudson RC Society excerpts follows Batt-Chek low-battery warning device developed on-board use RC model airplanes cars boats weighs less 1/2 ounce measures approximately 1Y~ x 7/ x %- thick installed model shows battery pack condition means two bright LEDs press-to-test pushbutton switch gives three-level indication battery pack status follows OK Green LED battery pack ex ceeds 495 V 01 Amp load GEFrING LOW Red Green LEDs both Battery Pack between 48 V 495 V 01 DANGER Red LED battery pack less 48 V 01 case asking what advantage Batt-Chek might have over ESV meter opinion because intend ed installed permanently model likely use before flight comes adhesive-backed foam tape mounting inside sur face fuselage two small holes side fuselage permit LEDs protrude Alternatively could mounted behind instrument panel open-cockpit model pressto-test button panel itself Batt Chek lists $1495 complete can obtained Protune Corp 50 Pasture Lane Poughkeepsie NY 12603 phone 914 462-6452 Jesse also has suggestion reduce possibility short circuits flight pack switch see incident reported June 1985 Safety column suggestion also has secondary benefit should increase reliability connections made switch contacts Somewhere col umn will find electrical schematic shows conventional method wiring switch together Jesses sug gested alternative method wiring switch routing side battery power through switch probability short switch reduced Switch contact reliability creased wiring two poles double-pole switch parallel Thus normal operation set switch con tacts redundant provides backup case poor no contact other set Staying subject airbornebattery-pack failure back February 1985 Safety column reported case 1A-Scale flyaway resulted unintentional ejection battery pack takeoff time stated didnt know device market would automatically close throttle upon loss battery power Jim Tagg Pittsburgh PA wrote drew attention previous article MA addressed just issue help Associate Editor Ross McMullen have found article George Myers Radio Technique column January 1983 issue MA Georges arti cle concerned Helicopters applies equally well fixed-wing models case dont save back issues MA following Georges suggestion simple spring may provide answer need use throttle has very low friction could also use ball-bearing coreless-motor throttle servo Such throttles servos can rather easily fitted spring working Off throttle closed irection Once battery voltage removed spring can overpower servo coreless motor servos offer almost no resistance power off engine will stop dont know what constantly run ning against spring load will servo seems reasonable expect some reduction useful life Only time some tests will tell whether such reduction significant readers have comments make suggestion make throttle fail-safe event elec trical power loss would rather send George Myers George Continued page 115 20Model Aviation model craft TOUCH UP AIR BRUSH ARISTO TEX COVERING MATERIAL LOW 2 METER ROLL $720 FOR DETAIL PAINTING OF AIRPLANE WINGS AND BOATS$4000 TACHOMElER W/LED READ OUT FOR EASY FIELD READING $4j rjj ACCURATE ENGINE RPM 12 PIECE WOOD CARVING SET HOBBYISTS/I QUICK HEAT SOLDERING GUN iPO WATT 21 PIECE TOOL SET US SIZE SCREWDRIVERS PLUS PHILLIPS HEX AND WRENCH TYPES $700 Ci TRIPLE HANDS WITH MAGNIFIER N EXTRA HELP IN ma HOLDING THOSEW SMALL PARTS WHILE$5 SOLDERING GLUING OR PAINTING MAGNIFIER LAMP WITH MULTI POSITION 39 $3000 / FLEXIBLE ARM 3 DIOPTER LENS FOR 4 liMES MAGNIFICATION Letters Editor Continued page 113 modeling interests first article would like comment guest editorial believe Mr Waterman expressed views ac tive instructors very well us spend flying time teaching others fly know what happens student pilot brings out wrong airplane takes twice long him learn fly dont believe however student cannot learn ship has ailerons Take Goldberg Eaglet example sincerely believe probably best trainer market have taught lots folks fly ailerons definitely hinderance learning process dont feel need go back days Smog Hog applaud Mr Watermans views keeping things simple beginner Anthony Stevens Knoxville TN am writing overwhelming apprecia tion guest editorial April 1985 issue Jim Waterman really enoyed Frankly stand behind him 100% Let explain first trainer Little Stik 6-ft wing flatbottomed airfoil polydihedral 576 sq area truly basic trainer would recover full stall about 10 ft plane crashed servo arm rudder came off turn left full rudder locked-in friend gave Box Fly 20 put big wing it flew better Loops spins snaps could flown yet stable Old-Timer wing broke using glider fuselage switched nodihedral fully-symmetrical-airfoil wing ailerons needed larger power plant got wasnt ready second airplane guest editorial called bumped about quite bit During winter fixed up after wards could fly much better However still herkey-jerkey ailerons doing better before crashed five times first switched ailerons took year lots patience really bruised ego learn tt fly Dont think stayed basic trainer never crashed due pilot error would have faster learning session Its good thing really love RCing because greenhorns would have given up long time ago Chris Allen Pittsburg CA Although enjoy Model Aviation disappointed aggravated totally honest little mad after reading guest editorial April 1985 edition got impression guest editor little envious skill level required fly Pattern Racing ship particularly disturbed remark us fly Pattern Racing models cannot under stand needs beginners us start somewhere us successful first flying session totally mishaps save breaking couple props hangup Antic Bipes Sopwith Pups fine Go sport enjoy covers variety aircraft types varying skill requirements Once beginner present have six trainees has reached skill level competently fly trainer respect choice models continue assist long think needs Instructors determined type aircraft fly Instructors born David C Lassiter Aulander NC Safety/Preston Continued page 20 radio expert among contributing editors Model Aviation last comment concerns radio inter ference Im also going buck George Myers Ive several let ters asking opinion RC chan nels should avoided because inter ference other channels really dont know answer However Radio Technique column ap peared April 1985 issue page 40 George did mention subject radio interference also referenced number previous columns discussed subject have ques tions about interference first check back issues magazine may find answers seek Also dont forget District Frequency Coordina tor people appointed pin point local problems names addresses can found head District VPs column AMA News section magazine Have another safe month John Preston 12235 Tilden wood Dr Rockville MD 20852 M lies-Atwood/Reese Continued page 30 airplane flew nicely another 30 seconds little nervous looped rolled about sky little green airplane needed just another foot altitude complete split-S told just wasnt day inspection didnt appear badly damaged landing gear bent lower cowl popped loose nothing else appeared broken repaired cowl 5-mm epoxy tried again time going touch As soon airbne Continued page 118 September 1985115
Edition: Model Aviation - 1985/09
Page Numbers: 16, 17, 18, 20, 115
& ~ John PrestonPrr Cl Boron fibers Pro Con An board battery tester RC Increase reliability RC systems Off Switch CRARGER CHARGER CH 9 0 CONVENTiONAL SWITCH WIRING HH H H HI2 H ERNATIVE SWITCH WIRING BAD STUFF June 1985 Safety column included discussion whether models containing boron fIlament should banned AMA-sanctioned compe titions because allegations concerning safety product also asked readers answers two questions 1 Should models containing boron outlawed AMA competition categories 2 Should models contain ing boron outlawed certain AMA competition categories categories Thirteen readers kind enough re spond questions addition al reader didnt specifically respond questions sent letter safely handle boron filament 13 cast vote nine did want see boron banned four responded yes question No 1 meaning models containing boron should permitted AMA competition category guess predicted outcome ballot because general Americans like have somebody dictating rules person al safety good example outside modeling world unpopularity mandatory automobile-seat-belt-usage laws have adopted some state governments its hide theyre trying protect part youd rather make decisions affect ing own safety yourself So will boron models members AMA Safety Committee read ing column vote keep boron because possible competitive ad vantage can bring model because its light weight combined high strength reader uses boron filament flying wires 1/72-scale non-flying models another Sailplane enthusiast sent letters giving some tips handle boron safely Excerpts letters follow planes RC installation known wiring harnesses have switch wired depicted diagram left possibility exists short circuits switch Rewiring switch shown right aimost completely cilminates possibility internal shorts well greatly increasing reliability switch itself Both HA Farrar son op posed banning boron despite fact have experienced splinters flesh HAs letter states Boron deposited 00005-in tungsten filament diameter 0004 relatively stiff hard BRIT TLE boron/epoxy laminate best machined trimmed diamond-grit cutting tools essentially grinding opera tion individual filaments cannot cut blade breaks somewhat similar cutting piano wire diagonal cutters problem unlike wire addition desired break secon dary break occurs approximately 006 away desired break either direction depending little unobserved piece gets hand 16 Model Aviation e . fV V ThA11K3 F5R LETTIN ME HELP LAUNCH VOUR NEW PLANE NARYAN THl THINIG- FELL OUT JU3T 8BFORE L5T ER C7rO or footand dont get chair diameter stiffness fila ment permits function like needle its brittleness can leave piece inside flesh Hand lay-up boron/epoxy tape better performed bare-handed gloves gloves assist small segments penetrating skin diameter color render small pieces virtually invisible anything plain light-colored surface HA wound up letter PS suggested .. on boron rug March 1985 safety col umn should chuck rug wear shoes other letter tips han dle boron came Harley Michaelis must Sailplane flier since put LSF number 023 after signature Harley did respond questions whether boron should banned what stated following let ter Im assuming would want see ban response article boron June 1985 MA comment directed question banning banning safely han dle stuff caution usually sounded little said about actual tech nique bungling experiences may common subsequent solutions may interest others first experience consisted trans ferring 200 feet stuff reel 1000 feet owned friend taped end plastic gallon jug attempted wind reel unwound brittle stuff kept break ing bits pieces flew everywhere Relocating retaping two loose ends jug common fingers im paled general transfer bad experience No doubt sharp bits unknowingly ended up floor cause future trouble ran dowel through jug its ends supported wires dangling low ceiling workshop means dispensing boron idea use stick gauge lengths needed break off pieces Unwanted breaks common pieces flew loose end jug went wild fingers run through Fingers boron structure joined CyA actual application structure crude unwanted slack filaments Except wish get strength wings would have abandoned whole idea view use boron presents following problems 1 need finger eye protection 2 Storing reel will wildly unwind unless end taped 3 Dispensing breaking off lengths desired 4 Keeping abso lute track loose shards safely disposing 5 Proper alignment positioning filaments struc ture 6 Attaching filaments structure store reel made shallow box put width about reel diameter -in dowel centered box reel turn edge box drilled hole end boron pass through dispense practice box laid workbench near model structure Plans white paper placed under structure background dark boron Eye protection worn breaking off pieces As length pulled mobile dispenser broken off smooth-jawed pliers hand covered white Kleenex held over pliers breaking commonly results tiny loose shards will Kleenex work surface can seen After break Kleenex white surface pliers should inspected shards may captured masking tape covers problems through four problem five length brok en off laid other pieces set ends raised up shim desired number filaments has laid down can picked up group between thumb forefinger hand Let dangle alter nately stroke thumb forefin ger hand get side side Continued page 18 September1985 17 TEXXON FtELD BOXES ARE MANUFACTURED FROM SELECTED PLYWOOD SANDED STAINED FINISHED MANY EXTRA FEATURES ARE INCLUDED IN EACH BOX SPECIAL FEATURES DELUXE CUSTOM BOX INCLUDES Power take out box wilt hold starter battery well tool storage Folding legs Adjustable folding locking tuselage holder Wing caddy tool drawers STARTER POWER PANEL NOT INCLUDED N 9 Oder Add 5250 tor Insaracce handting MasterCardEny Daleorder COD enclose payment 01ChecklMOplease send wy VwaHOBBIES CardNOAdd$200PO BOX 421160 MtAMt FLA 33242 THANK YOU FOR YOUR ORDER PHONE 305 638-4197 K. ing both ends group filaments laid structure Any new overlaps bows can worked out fingertips smoothing center towards ends until filaments straight side-by-side Pins can placed structure help position filaments attaching filaments structure after posi tioning drop thin CyA glue first applied center group secure structure Drops progressively applied center towards ends being left wick cure before another drop applied avoid excess glue Accelerator used can cause bumps cured CyA Bare fingers never placed boron glue wicking never run back against raw ends filaments touched during wick ing something like contoured piece Tupperware bit backing cov ering film used finger protection boron must encased provide maximum increase spar strength typical D-box panel construction fila ments can applied bottom sheeting bottom spar added sandwich filaments After webbing top spar goes filaments added filaments sandwiched top sheeting slow CyA epoxy can used make lamination held under straightedge curing John opinion procedures have made boron relatively easy safe work D-box wings certainly stiffer contribute safety virtue less likelihood collapse under stress readers may find information beneficial last word exotic building materials concerns carbon fibers Although previously published letter April 1985 Safety column reader finger pierced carbon fibers experts tell fibers order magnitude safer handle boron Apparently hazard running finger along edge carbon fiber/epoxy laminate about equal hazard running finger along edge rough-sawn piece plywood Smart people just dont think RC modelers will agree vulnerable component models radio control system battery pack Without power its batteries model just isnt going respond control inputs letter Jesse Aronstein told about new product specifically intended provide convenient means checking state charge models on-board batter ies product known Batt Check RX-l marketed Protune Corporation company Jesse start ed order market electronic musi Continued page 20 18 Model Aviation NEW MK 2 H & K SUPER STARTERS Look before YOU leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $t 50 postage handling Z495 $3295 $3995 Dealers Inquiries invited jinmflIMN91JJ9]DJMWNW~ CHECK THESE FEATURES THEN COMPAREII High Rim Strength Lubricant spe cial additives increase lubri city extreme pressure character istics oil Viscosity index Improvers insure proper lubrication high RPM high temperatures WettIng Agents increase plating action oil SpecIal Detergents cut power rob bing varnish Anti-Foam AddItives prevent high RPM lean-out Rust Preventatlves protect expensive engines Highest Qusilty Ingredients insure top engine performance reliability Sheldons Au New Super-Sport Fueis specisi blend Nitros lower hying costs insure long engine life have lowered oil content oh fuel formuistions Type Nitro 0/ Lubricant1-4 Gal 5-23 Gal 2443 Gal 64-123 Gal 124 Gal FAIQ5/ Synthetic$675$595$550$525$495 5s55/s Synthetic$775$695$675$650$595 Sc5/o Castor$775$695$675$650$595 lOs10% Synthetic$895$819$795$775$750 lOc10/o Castor$895$819$795$775$750 R/C 121/2% Syn/Castar $995$919$875$850$795 iSs15/s Synthetic$995$919$8 75$850$795 4-cyc 7% Castor/Syn $850$7 95$7 75$750$695 4-cyc 15% Castor/Syn $995$9 19$875$850$795 10/s SUPER SPORT$795$695$650$625$595 15/s R SPORT$895$795$750$725$695 10/s SUPER SPORT 4-cycle$795$695$650$625$595 SHELDONS HOBBY SHOP 3157 Alum Rock Avenue Jose California 95127 Out State FOR ORDERS CALL California 800 228-3237 408 251-0789 For Information Call 408 2518686 Hours Mon Wed Fri & Sat 9 305 30 Thur 930900 Sun 1200500 M/C VISA 123 Gai via UPS 24-124 Gal via truck freight PAID UPS COD OK- $190 $300 Handling per fuel order ...EEEEEEEEEEEEE cal instrument tunerhence company name description Batt-Chek contained March 1985 issue Flight Line newsletter MidHudson RC Society excerpts follows Batt-Chek low-battery warning device developed on-board use RC model airplanes cars boats weighs less 1/2 ounce measures approximately 1Y~ x 7/ x %- thick installed model shows battery pack condition means two bright LEDs press-to-test pushbutton switch gives three-level indication battery pack status follows OK Green LED battery pack ex ceeds 495 V 01 Amp load GEFrING LOW Red Green LEDs both Battery Pack between 48 V 495 V 01 DANGER Red LED battery pack less 48 V 01 case asking what advantage Batt-Chek might have over ESV meter opinion because intend ed installed permanently model likely use before flight comes adhesive-backed foam tape mounting inside sur face fuselage two small holes side fuselage permit LEDs protrude Alternatively could mounted behind instrument panel open-cockpit model pressto-test button panel itself Batt Chek lists $1495 complete can obtained Protune Corp 50 Pasture Lane Poughkeepsie NY 12603 phone 914 462-6452 Jesse also has suggestion reduce possibility short circuits flight pack switch see incident reported June 1985 Safety column suggestion also has secondary benefit should increase reliability connections made switch contacts Somewhere col umn will find electrical schematic shows conventional method wiring switch together Jesses sug gested alternative method wiring switch routing side battery power through switch probability short switch reduced Switch contact reliability creased wiring two poles double-pole switch parallel Thus normal operation set switch con tacts redundant provides backup case poor no contact other set Staying subject airbornebattery-pack failure back February 1985 Safety column reported case 1A-Scale flyaway resulted unintentional ejection battery pack takeoff time stated didnt know device market would automatically close throttle upon loss battery power Jim Tagg Pittsburgh PA wrote drew attention previous article MA addressed just issue help Associate Editor Ross McMullen have found article George Myers Radio Technique column January 1983 issue MA Georges arti cle concerned Helicopters applies equally well fixed-wing models case dont save back issues MA following Georges suggestion simple spring may provide answer need use throttle has very low friction could also use ball-bearing coreless-motor throttle servo Such throttles servos can rather easily fitted spring working Off throttle closed irection Once battery voltage removed spring can overpower servo coreless motor servos offer almost no resistance power off engine will stop dont know what constantly run ning against spring load will servo seems reasonable expect some reduction useful life Only time some tests will tell whether such reduction significant readers have comments make suggestion make throttle fail-safe event elec trical power loss would rather send George Myers George Continued page 115 20Model Aviation model craft TOUCH UP AIR BRUSH ARISTO TEX COVERING MATERIAL LOW 2 METER ROLL $720 FOR DETAIL PAINTING OF AIRPLANE WINGS AND BOATS$4000 TACHOMElER W/LED READ OUT FOR EASY FIELD READING $4j rjj ACCURATE ENGINE RPM 12 PIECE WOOD CARVING SET HOBBYISTS/I QUICK HEAT SOLDERING GUN iPO WATT 21 PIECE TOOL SET US SIZE SCREWDRIVERS PLUS PHILLIPS HEX AND WRENCH TYPES $700 Ci TRIPLE HANDS WITH MAGNIFIER N EXTRA HELP IN ma HOLDING THOSEW SMALL PARTS WHILE$5 SOLDERING GLUING OR PAINTING MAGNIFIER LAMP WITH MULTI POSITION 39 $3000 / FLEXIBLE ARM 3 DIOPTER LENS FOR 4 liMES MAGNIFICATION Letters Editor Continued page 113 modeling interests first article would like comment guest editorial believe Mr Waterman expressed views ac tive instructors very well us spend flying time teaching others fly know what happens student pilot brings out wrong airplane takes twice long him learn fly dont believe however student cannot learn ship has ailerons Take Goldberg Eaglet example sincerely believe probably best trainer market have taught lots folks fly ailerons definitely hinderance learning process dont feel need go back days Smog Hog applaud Mr Watermans views keeping things simple beginner Anthony Stevens Knoxville TN am writing overwhelming apprecia tion guest editorial April 1985 issue Jim Waterman really enoyed Frankly stand behind him 100% Let explain first trainer Little Stik 6-ft wing flatbottomed airfoil polydihedral 576 sq area truly basic trainer would recover full stall about 10 ft plane crashed servo arm rudder came off turn left full rudder locked-in friend gave Box Fly 20 put big wing it flew better Loops spins snaps could flown yet stable Old-Timer wing broke using glider fuselage switched nodihedral fully-symmetrical-airfoil wing ailerons needed larger power plant got wasnt ready second airplane guest editorial called bumped about quite bit During winter fixed up after wards could fly much better However still herkey-jerkey ailerons doing better before crashed five times first switched ailerons took year lots patience really bruised ego learn tt fly Dont think stayed basic trainer never crashed due pilot error would have faster learning session Its good thing really love RCing because greenhorns would have given up long time ago Chris Allen Pittsburg CA Although enjoy Model Aviation disappointed aggravated totally honest little mad after reading guest editorial April 1985 edition got impression guest editor little envious skill level required fly Pattern Racing ship particularly disturbed remark us fly Pattern Racing models cannot under stand needs beginners us start somewhere us successful first flying session totally mishaps save breaking couple props hangup Antic Bipes Sopwith Pups fine Go sport enjoy covers variety aircraft types varying skill requirements Once beginner present have six trainees has reached skill level competently fly trainer respect choice models continue assist long think needs Instructors determined type aircraft fly Instructors born David C Lassiter Aulander NC Safety/Preston Continued page 20 radio expert among contributing editors Model Aviation last comment concerns radio inter ference Im also going buck George Myers Ive several let ters asking opinion RC chan nels should avoided because inter ference other channels really dont know answer However Radio Technique column ap peared April 1985 issue page 40 George did mention subject radio interference also referenced number previous columns discussed subject have ques tions about interference first check back issues magazine may find answers seek Also dont forget District Frequency Coordina tor people appointed pin point local problems names addresses can found head District VPs column AMA News section magazine Have another safe month John Preston 12235 Tilden wood Dr Rockville MD 20852 M lies-Atwood/Reese Continued page 30 airplane flew nicely another 30 seconds little nervous looped rolled about sky little green airplane needed just another foot altitude complete split-S told just wasnt day inspection didnt appear badly damaged landing gear bent lower cowl popped loose nothing else appeared broken repaired cowl 5-mm epoxy tried again time going touch As soon airbne Continued page 118 September 1985115
Edition: Model Aviation - 1985/09
Page Numbers: 16, 17, 18, 20, 115
& ~ John PrestonPrr Cl Boron fibers Pro Con An board battery tester RC Increase reliability RC systems Off Switch CRARGER CHARGER CH 9 0 CONVENTiONAL SWITCH WIRING HH H H HI2 H ERNATIVE SWITCH WIRING BAD STUFF June 1985 Safety column included discussion whether models containing boron fIlament should banned AMA-sanctioned compe titions because allegations concerning safety product also asked readers answers two questions 1 Should models containing boron outlawed AMA competition categories 2 Should models contain ing boron outlawed certain AMA competition categories categories Thirteen readers kind enough re spond questions addition al reader didnt specifically respond questions sent letter safely handle boron filament 13 cast vote nine did want see boron banned four responded yes question No 1 meaning models containing boron should permitted AMA competition category guess predicted outcome ballot because general Americans like have somebody dictating rules person al safety good example outside modeling world unpopularity mandatory automobile-seat-belt-usage laws have adopted some state governments its hide theyre trying protect part youd rather make decisions affect ing own safety yourself So will boron models members AMA Safety Committee read ing column vote keep boron because possible competitive ad vantage can bring model because its light weight combined high strength reader uses boron filament flying wires 1/72-scale non-flying models another Sailplane enthusiast sent letters giving some tips handle boron safely Excerpts letters follow planes RC installation known wiring harnesses have switch wired depicted diagram left possibility exists short circuits switch Rewiring switch shown right aimost completely cilminates possibility internal shorts well greatly increasing reliability switch itself Both HA Farrar son op posed banning boron despite fact have experienced splinters flesh HAs letter states Boron deposited 00005-in tungsten filament diameter 0004 relatively stiff hard BRIT TLE boron/epoxy laminate best machined trimmed diamond-grit cutting tools essentially grinding opera tion individual filaments cannot cut blade breaks somewhat similar cutting piano wire diagonal cutters problem unlike wire addition desired break secon dary break occurs approximately 006 away desired break either direction depending little unobserved piece gets hand 16 Model Aviation e . fV V ThA11K3 F5R LETTIN ME HELP LAUNCH VOUR NEW PLANE NARYAN THl THINIG- FELL OUT JU3T 8BFORE L5T ER C7rO or footand dont get chair diameter stiffness fila ment permits function like needle its brittleness can leave piece inside flesh Hand lay-up boron/epoxy tape better performed bare-handed gloves gloves assist small segments penetrating skin diameter color render small pieces virtually invisible anything plain light-colored surface HA wound up letter PS suggested .. on boron rug March 1985 safety col umn should chuck rug wear shoes other letter tips han dle boron came Harley Michaelis must Sailplane flier since put LSF number 023 after signature Harley did respond questions whether boron should banned what stated following let ter Im assuming would want see ban response article boron June 1985 MA comment directed question banning banning safely han dle stuff caution usually sounded little said about actual tech nique bungling experiences may common subsequent solutions may interest others first experience consisted trans ferring 200 feet stuff reel 1000 feet owned friend taped end plastic gallon jug attempted wind reel unwound brittle stuff kept break ing bits pieces flew everywhere Relocating retaping two loose ends jug common fingers im paled general transfer bad experience No doubt sharp bits unknowingly ended up floor cause future trouble ran dowel through jug its ends supported wires dangling low ceiling workshop means dispensing boron idea use stick gauge lengths needed break off pieces Unwanted breaks common pieces flew loose end jug went wild fingers run through Fingers boron structure joined CyA actual application structure crude unwanted slack filaments Except wish get strength wings would have abandoned whole idea view use boron presents following problems 1 need finger eye protection 2 Storing reel will wildly unwind unless end taped 3 Dispensing breaking off lengths desired 4 Keeping abso lute track loose shards safely disposing 5 Proper alignment positioning filaments struc ture 6 Attaching filaments structure store reel made shallow box put width about reel diameter -in dowel centered box reel turn edge box drilled hole end boron pass through dispense practice box laid workbench near model structure Plans white paper placed under structure background dark boron Eye protection worn breaking off pieces As length pulled mobile dispenser broken off smooth-jawed pliers hand covered white Kleenex held over pliers breaking commonly results tiny loose shards will Kleenex work surface can seen After break Kleenex white surface pliers should inspected shards may captured masking tape covers problems through four problem five length brok en off laid other pieces set ends raised up shim desired number filaments has laid down can picked up group between thumb forefinger hand Let dangle alter nately stroke thumb forefin ger hand get side side Continued page 18 September1985 17 TEXXON FtELD BOXES ARE MANUFACTURED FROM SELECTED PLYWOOD SANDED STAINED FINISHED MANY EXTRA FEATURES ARE INCLUDED IN EACH BOX SPECIAL FEATURES DELUXE CUSTOM BOX INCLUDES Power take out box wilt hold starter battery well tool storage Folding legs Adjustable folding locking tuselage holder Wing caddy tool drawers STARTER POWER PANEL NOT INCLUDED N 9 Oder Add 5250 tor Insaracce handting MasterCardEny Daleorder COD enclose payment 01ChecklMOplease send wy VwaHOBBIES CardNOAdd$200PO BOX 421160 MtAMt FLA 33242 THANK YOU FOR YOUR ORDER PHONE 305 638-4197 K. ing both ends group filaments laid structure Any new overlaps bows can worked out fingertips smoothing center towards ends until filaments straight side-by-side Pins can placed structure help position filaments attaching filaments structure after posi tioning drop thin CyA glue first applied center group secure structure Drops progressively applied center towards ends being left wick cure before another drop applied avoid excess glue Accelerator used can cause bumps cured CyA Bare fingers never placed boron glue wicking never run back against raw ends filaments touched during wick ing something like contoured piece Tupperware bit backing cov ering film used finger protection boron must encased provide maximum increase spar strength typical D-box panel construction fila ments can applied bottom sheeting bottom spar added sandwich filaments After webbing top spar goes filaments added filaments sandwiched top sheeting slow CyA epoxy can used make lamination held under straightedge curing John opinion procedures have made boron relatively easy safe work D-box wings certainly stiffer contribute safety virtue less likelihood collapse under stress readers may find information beneficial last word exotic building materials concerns carbon fibers Although previously published letter April 1985 Safety column reader finger pierced carbon fibers experts tell fibers order magnitude safer handle boron Apparently hazard running finger along edge carbon fiber/epoxy laminate about equal hazard running finger along edge rough-sawn piece plywood Smart people just dont think RC modelers will agree vulnerable component models radio control system battery pack Without power its batteries model just isnt going respond control inputs letter Jesse Aronstein told about new product specifically intended provide convenient means checking state charge models on-board batter ies product known Batt Check RX-l marketed Protune Corporation company Jesse start ed order market electronic musi Continued page 20 18 Model Aviation NEW MK 2 H & K SUPER STARTERS Look before YOU leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $t 50 postage handling Z495 $3295 $3995 Dealers Inquiries invited jinmflIMN91JJ9]DJMWNW~ CHECK THESE FEATURES THEN COMPAREII High Rim Strength Lubricant spe cial additives increase lubri city extreme pressure character istics oil Viscosity index Improvers insure proper lubrication high RPM high temperatures WettIng Agents increase plating action oil SpecIal Detergents cut power rob bing varnish Anti-Foam AddItives prevent high RPM lean-out Rust Preventatlves protect expensive engines Highest Qusilty Ingredients insure top engine performance reliability Sheldons Au New Super-Sport Fueis specisi blend Nitros lower hying costs insure long engine life have lowered oil content oh fuel formuistions Type Nitro 0/ Lubricant1-4 Gal 5-23 Gal 2443 Gal 64-123 Gal 124 Gal FAIQ5/ Synthetic$675$595$550$525$495 5s55/s Synthetic$775$695$675$650$595 Sc5/o Castor$775$695$675$650$595 lOs10% Synthetic$895$819$795$775$750 lOc10/o Castor$895$819$795$775$750 R/C 121/2% Syn/Castar $995$919$875$850$795 iSs15/s Synthetic$995$919$8 75$850$795 4-cyc 7% Castor/Syn $850$7 95$7 75$750$695 4-cyc 15% Castor/Syn $995$9 19$875$850$795 10/s SUPER SPORT$795$695$650$625$595 15/s R SPORT$895$795$750$725$695 10/s SUPER SPORT 4-cycle$795$695$650$625$595 SHELDONS HOBBY SHOP 3157 Alum Rock Avenue Jose California 95127 Out State FOR ORDERS CALL California 800 228-3237 408 251-0789 For Information Call 408 2518686 Hours Mon Wed Fri & Sat 9 305 30 Thur 930900 Sun 1200500 M/C VISA 123 Gai via UPS 24-124 Gal via truck freight PAID UPS COD OK- $190 $300 Handling per fuel order ...EEEEEEEEEEEEE cal instrument tunerhence company name description Batt-Chek contained March 1985 issue Flight Line newsletter MidHudson RC Society excerpts follows Batt-Chek low-battery warning device developed on-board use RC model airplanes cars boats weighs less 1/2 ounce measures approximately 1Y~ x 7/ x %- thick installed model shows battery pack condition means two bright LEDs press-to-test pushbutton switch gives three-level indication battery pack status follows OK Green LED battery pack ex ceeds 495 V 01 Amp load GEFrING LOW Red Green LEDs both Battery Pack between 48 V 495 V 01 DANGER Red LED battery pack less 48 V 01 case asking what advantage Batt-Chek might have over ESV meter opinion because intend ed installed permanently model likely use before flight comes adhesive-backed foam tape mounting inside sur face fuselage two small holes side fuselage permit LEDs protrude Alternatively could mounted behind instrument panel open-cockpit model pressto-test button panel itself Batt Chek lists $1495 complete can obtained Protune Corp 50 Pasture Lane Poughkeepsie NY 12603 phone 914 462-6452 Jesse also has suggestion reduce possibility short circuits flight pack switch see incident reported June 1985 Safety column suggestion also has secondary benefit should increase reliability connections made switch contacts Somewhere col umn will find electrical schematic shows conventional method wiring switch together Jesses sug gested alternative method wiring switch routing side battery power through switch probability short switch reduced Switch contact reliability creased wiring two poles double-pole switch parallel Thus normal operation set switch con tacts redundant provides backup case poor no contact other set Staying subject airbornebattery-pack failure back February 1985 Safety column reported case 1A-Scale flyaway resulted unintentional ejection battery pack takeoff time stated didnt know device market would automatically close throttle upon loss battery power Jim Tagg Pittsburgh PA wrote drew attention previous article MA addressed just issue help Associate Editor Ross McMullen have found article George Myers Radio Technique column January 1983 issue MA Georges arti cle concerned Helicopters applies equally well fixed-wing models case dont save back issues MA following Georges suggestion simple spring may provide answer need use throttle has very low friction could also use ball-bearing coreless-motor throttle servo Such throttles servos can rather easily fitted spring working Off throttle closed irection Once battery voltage removed spring can overpower servo coreless motor servos offer almost no resistance power off engine will stop dont know what constantly run ning against spring load will servo seems reasonable expect some reduction useful life Only time some tests will tell whether such reduction significant readers have comments make suggestion make throttle fail-safe event elec trical power loss would rather send George Myers George Continued page 115 20Model Aviation model craft TOUCH UP AIR BRUSH ARISTO TEX COVERING MATERIAL LOW 2 METER ROLL $720 FOR DETAIL PAINTING OF AIRPLANE WINGS AND BOATS$4000 TACHOMElER W/LED READ OUT FOR EASY FIELD READING $4j rjj ACCURATE ENGINE RPM 12 PIECE WOOD CARVING SET HOBBYISTS/I QUICK HEAT SOLDERING GUN iPO WATT 21 PIECE TOOL SET US SIZE SCREWDRIVERS PLUS PHILLIPS HEX AND WRENCH TYPES $700 Ci TRIPLE HANDS WITH MAGNIFIER N EXTRA HELP IN ma HOLDING THOSEW SMALL PARTS WHILE$5 SOLDERING GLUING OR PAINTING MAGNIFIER LAMP WITH MULTI POSITION 39 $3000 / FLEXIBLE ARM 3 DIOPTER LENS FOR 4 liMES MAGNIFICATION Letters Editor Continued page 113 modeling interests first article would like comment guest editorial believe Mr Waterman expressed views ac tive instructors very well us spend flying time teaching others fly know what happens student pilot brings out wrong airplane takes twice long him learn fly dont believe however student cannot learn ship has ailerons Take Goldberg Eaglet example sincerely believe probably best trainer market have taught lots folks fly ailerons definitely hinderance learning process dont feel need go back days Smog Hog applaud Mr Watermans views keeping things simple beginner Anthony Stevens Knoxville TN am writing overwhelming apprecia tion guest editorial April 1985 issue Jim Waterman really enoyed Frankly stand behind him 100% Let explain first trainer Little Stik 6-ft wing flatbottomed airfoil polydihedral 576 sq area truly basic trainer would recover full stall about 10 ft plane crashed servo arm rudder came off turn left full rudder locked-in friend gave Box Fly 20 put big wing it flew better Loops spins snaps could flown yet stable Old-Timer wing broke using glider fuselage switched nodihedral fully-symmetrical-airfoil wing ailerons needed larger power plant got wasnt ready second airplane guest editorial called bumped about quite bit During winter fixed up after wards could fly much better However still herkey-jerkey ailerons doing better before crashed five times first switched ailerons took year lots patience really bruised ego learn tt fly Dont think stayed basic trainer never crashed due pilot error would have faster learning session Its good thing really love RCing because greenhorns would have given up long time ago Chris Allen Pittsburg CA Although enjoy Model Aviation disappointed aggravated totally honest little mad after reading guest editorial April 1985 edition got impression guest editor little envious skill level required fly Pattern Racing ship particularly disturbed remark us fly Pattern Racing models cannot under stand needs beginners us start somewhere us successful first flying session totally mishaps save breaking couple props hangup Antic Bipes Sopwith Pups fine Go sport enjoy covers variety aircraft types varying skill requirements Once beginner present have six trainees has reached skill level competently fly trainer respect choice models continue assist long think needs Instructors determined type aircraft fly Instructors born David C Lassiter Aulander NC Safety/Preston Continued page 20 radio expert among contributing editors Model Aviation last comment concerns radio inter ference Im also going buck George Myers Ive several let ters asking opinion RC chan nels should avoided because inter ference other channels really dont know answer However Radio Technique column ap peared April 1985 issue page 40 George did mention subject radio interference also referenced number previous columns discussed subject have ques tions about interference first check back issues magazine may find answers seek Also dont forget District Frequency Coordina tor people appointed pin point local problems names addresses can found head District VPs column AMA News section magazine Have another safe month John Preston 12235 Tilden wood Dr Rockville MD 20852 M lies-Atwood/Reese Continued page 30 airplane flew nicely another 30 seconds little nervous looped rolled about sky little green airplane needed just another foot altitude complete split-S told just wasnt day inspection didnt appear badly damaged landing gear bent lower cowl popped loose nothing else appeared broken repaired cowl 5-mm epoxy tried again time going touch As soon airbne Continued page 118 September 1985115
Edition: Model Aviation - 1985/09
Page Numbers: 16, 17, 18, 20, 115
& ~ John PrestonPrr Cl Boron fibers Pro Con An board battery tester RC Increase reliability RC systems Off Switch CRARGER CHARGER CH 9 0 CONVENTiONAL SWITCH WIRING HH H H HI2 H ERNATIVE SWITCH WIRING BAD STUFF June 1985 Safety column included discussion whether models containing boron fIlament should banned AMA-sanctioned compe titions because allegations concerning safety product also asked readers answers two questions 1 Should models containing boron outlawed AMA competition categories 2 Should models contain ing boron outlawed certain AMA competition categories categories Thirteen readers kind enough re spond questions addition al reader didnt specifically respond questions sent letter safely handle boron filament 13 cast vote nine did want see boron banned four responded yes question No 1 meaning models containing boron should permitted AMA competition category guess predicted outcome ballot because general Americans like have somebody dictating rules person al safety good example outside modeling world unpopularity mandatory automobile-seat-belt-usage laws have adopted some state governments its hide theyre trying protect part youd rather make decisions affect ing own safety yourself So will boron models members AMA Safety Committee read ing column vote keep boron because possible competitive ad vantage can bring model because its light weight combined high strength reader uses boron filament flying wires 1/72-scale non-flying models another Sailplane enthusiast sent letters giving some tips handle boron safely Excerpts letters follow planes RC installation known wiring harnesses have switch wired depicted diagram left possibility exists short circuits switch Rewiring switch shown right aimost completely cilminates possibility internal shorts well greatly increasing reliability switch itself Both HA Farrar son op posed banning boron despite fact have experienced splinters flesh HAs letter states Boron deposited 00005-in tungsten filament diameter 0004 relatively stiff hard BRIT TLE boron/epoxy laminate best machined trimmed diamond-grit cutting tools essentially grinding opera tion individual filaments cannot cut blade breaks somewhat similar cutting piano wire diagonal cutters problem unlike wire addition desired break secon dary break occurs approximately 006 away desired break either direction depending little unobserved piece gets hand 16 Model Aviation e . fV V ThA11K3 F5R LETTIN ME HELP LAUNCH VOUR NEW PLANE NARYAN THl THINIG- FELL OUT JU3T 8BFORE L5T ER C7rO or footand dont get chair diameter stiffness fila ment permits function like needle its brittleness can leave piece inside flesh Hand lay-up boron/epoxy tape better performed bare-handed gloves gloves assist small segments penetrating skin diameter color render small pieces virtually invisible anything plain light-colored surface HA wound up letter PS suggested .. on boron rug March 1985 safety col umn should chuck rug wear shoes other letter tips han dle boron came Harley Michaelis must Sailplane flier since put LSF number 023 after signature Harley did respond questions whether boron should banned what stated following let ter Im assuming would want see ban response article boron June 1985 MA comment directed question banning banning safely han dle stuff caution usually sounded little said about actual tech nique bungling experiences may common subsequent solutions may interest others first experience consisted trans ferring 200 feet stuff reel 1000 feet owned friend taped end plastic gallon jug attempted wind reel unwound brittle stuff kept break ing bits pieces flew everywhere Relocating retaping two loose ends jug common fingers im paled general transfer bad experience No doubt sharp bits unknowingly ended up floor cause future trouble ran dowel through jug its ends supported wires dangling low ceiling workshop means dispensing boron idea use stick gauge lengths needed break off pieces Unwanted breaks common pieces flew loose end jug went wild fingers run through Fingers boron structure joined CyA actual application structure crude unwanted slack filaments Except wish get strength wings would have abandoned whole idea view use boron presents following problems 1 need finger eye protection 2 Storing reel will wildly unwind unless end taped 3 Dispensing breaking off lengths desired 4 Keeping abso lute track loose shards safely disposing 5 Proper alignment positioning filaments struc ture 6 Attaching filaments structure store reel made shallow box put width about reel diameter -in dowel centered box reel turn edge box drilled hole end boron pass through dispense practice box laid workbench near model structure Plans white paper placed under structure background dark boron Eye protection worn breaking off pieces As length pulled mobile dispenser broken off smooth-jawed pliers hand covered white Kleenex held over pliers breaking commonly results tiny loose shards will Kleenex work surface can seen After break Kleenex white surface pliers should inspected shards may captured masking tape covers problems through four problem five length brok en off laid other pieces set ends raised up shim desired number filaments has laid down can picked up group between thumb forefinger hand Let dangle alter nately stroke thumb forefin ger hand get side side Continued page 18 September1985 17 TEXXON FtELD BOXES ARE MANUFACTURED FROM SELECTED PLYWOOD SANDED STAINED FINISHED MANY EXTRA FEATURES ARE INCLUDED IN EACH BOX SPECIAL FEATURES DELUXE CUSTOM BOX INCLUDES Power take out box wilt hold starter battery well tool storage Folding legs Adjustable folding locking tuselage holder Wing caddy tool drawers STARTER POWER PANEL NOT INCLUDED N 9 Oder Add 5250 tor Insaracce handting MasterCardEny Daleorder COD enclose payment 01ChecklMOplease send wy VwaHOBBIES CardNOAdd$200PO BOX 421160 MtAMt FLA 33242 THANK YOU FOR YOUR ORDER PHONE 305 638-4197 K. ing both ends group filaments laid structure Any new overlaps bows can worked out fingertips smoothing center towards ends until filaments straight side-by-side Pins can placed structure help position filaments attaching filaments structure after posi tioning drop thin CyA glue first applied center group secure structure Drops progressively applied center towards ends being left wick cure before another drop applied avoid excess glue Accelerator used can cause bumps cured CyA Bare fingers never placed boron glue wicking never run back against raw ends filaments touched during wick ing something like contoured piece Tupperware bit backing cov ering film used finger protection boron must encased provide maximum increase spar strength typical D-box panel construction fila ments can applied bottom sheeting bottom spar added sandwich filaments After webbing top spar goes filaments added filaments sandwiched top sheeting slow CyA epoxy can used make lamination held under straightedge curing John opinion procedures have made boron relatively easy safe work D-box wings certainly stiffer contribute safety virtue less likelihood collapse under stress readers may find information beneficial last word exotic building materials concerns carbon fibers Although previously published letter April 1985 Safety column reader finger pierced carbon fibers experts tell fibers order magnitude safer handle boron Apparently hazard running finger along edge carbon fiber/epoxy laminate about equal hazard running finger along edge rough-sawn piece plywood Smart people just dont think RC modelers will agree vulnerable component models radio control system battery pack Without power its batteries model just isnt going respond control inputs letter Jesse Aronstein told about new product specifically intended provide convenient means checking state charge models on-board batter ies product known Batt Check RX-l marketed Protune Corporation company Jesse start ed order market electronic musi Continued page 20 18 Model Aviation NEW MK 2 H & K SUPER STARTERS Look before YOU leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $t 50 postage handling Z495 $3295 $3995 Dealers Inquiries invited jinmflIMN91JJ9]DJMWNW~ CHECK THESE FEATURES THEN COMPAREII High Rim Strength Lubricant spe cial additives increase lubri city extreme pressure character istics oil Viscosity index Improvers insure proper lubrication high RPM high temperatures WettIng Agents increase plating action oil SpecIal Detergents cut power rob bing varnish Anti-Foam AddItives prevent high RPM lean-out Rust Preventatlves protect expensive engines Highest Qusilty Ingredients insure top engine performance reliability Sheldons Au New Super-Sport Fueis specisi blend Nitros lower hying costs insure long engine life have lowered oil content oh fuel formuistions Type Nitro 0/ Lubricant1-4 Gal 5-23 Gal 2443 Gal 64-123 Gal 124 Gal FAIQ5/ Synthetic$675$595$550$525$495 5s55/s Synthetic$775$695$675$650$595 Sc5/o Castor$775$695$675$650$595 lOs10% Synthetic$895$819$795$775$750 lOc10/o Castor$895$819$795$775$750 R/C 121/2% Syn/Castar $995$919$875$850$795 iSs15/s Synthetic$995$919$8 75$850$795 4-cyc 7% Castor/Syn $850$7 95$7 75$750$695 4-cyc 15% Castor/Syn $995$9 19$875$850$795 10/s SUPER SPORT$795$695$650$625$595 15/s R SPORT$895$795$750$725$695 10/s SUPER SPORT 4-cycle$795$695$650$625$595 SHELDONS HOBBY SHOP 3157 Alum Rock Avenue Jose California 95127 Out State FOR ORDERS CALL California 800 228-3237 408 251-0789 For Information Call 408 2518686 Hours Mon Wed Fri & Sat 9 305 30 Thur 930900 Sun 1200500 M/C VISA 123 Gai via UPS 24-124 Gal via truck freight PAID UPS COD OK- $190 $300 Handling per fuel order ...EEEEEEEEEEEEE cal instrument tunerhence company name description Batt-Chek contained March 1985 issue Flight Line newsletter MidHudson RC Society excerpts follows Batt-Chek low-battery warning device developed on-board use RC model airplanes cars boats weighs less 1/2 ounce measures approximately 1Y~ x 7/ x %- thick installed model shows battery pack condition means two bright LEDs press-to-test pushbutton switch gives three-level indication battery pack status follows OK Green LED battery pack ex ceeds 495 V 01 Amp load GEFrING LOW Red Green LEDs both Battery Pack between 48 V 495 V 01 DANGER Red LED battery pack less 48 V 01 case asking what advantage Batt-Chek might have over ESV meter opinion because intend ed installed permanently model likely use before flight comes adhesive-backed foam tape mounting inside sur face fuselage two small holes side fuselage permit LEDs protrude Alternatively could mounted behind instrument panel open-cockpit model pressto-test button panel itself Batt Chek lists $1495 complete can obtained Protune Corp 50 Pasture Lane Poughkeepsie NY 12603 phone 914 462-6452 Jesse also has suggestion reduce possibility short circuits flight pack switch see incident reported June 1985 Safety column suggestion also has secondary benefit should increase reliability connections made switch contacts Somewhere col umn will find electrical schematic shows conventional method wiring switch together Jesses sug gested alternative method wiring switch routing side battery power through switch probability short switch reduced Switch contact reliability creased wiring two poles double-pole switch parallel Thus normal operation set switch con tacts redundant provides backup case poor no contact other set Staying subject airbornebattery-pack failure back February 1985 Safety column reported case 1A-Scale flyaway resulted unintentional ejection battery pack takeoff time stated didnt know device market would automatically close throttle upon loss battery power Jim Tagg Pittsburgh PA wrote drew attention previous article MA addressed just issue help Associate Editor Ross McMullen have found article George Myers Radio Technique column January 1983 issue MA Georges arti cle concerned Helicopters applies equally well fixed-wing models case dont save back issues MA following Georges suggestion simple spring may provide answer need use throttle has very low friction could also use ball-bearing coreless-motor throttle servo Such throttles servos can rather easily fitted spring working Off throttle closed irection Once battery voltage removed spring can overpower servo coreless motor servos offer almost no resistance power off engine will stop dont know what constantly run ning against spring load will servo seems reasonable expect some reduction useful life Only time some tests will tell whether such reduction significant readers have comments make suggestion make throttle fail-safe event elec trical power loss would rather send George Myers George Continued page 115 20Model Aviation model craft TOUCH UP AIR BRUSH ARISTO TEX COVERING MATERIAL LOW 2 METER ROLL $720 FOR DETAIL PAINTING OF AIRPLANE WINGS AND BOATS$4000 TACHOMElER W/LED READ OUT FOR EASY FIELD READING $4j rjj ACCURATE ENGINE RPM 12 PIECE WOOD CARVING SET HOBBYISTS/I QUICK HEAT SOLDERING GUN iPO WATT 21 PIECE TOOL SET US SIZE SCREWDRIVERS PLUS PHILLIPS HEX AND WRENCH TYPES $700 Ci TRIPLE HANDS WITH MAGNIFIER N EXTRA HELP IN ma HOLDING THOSEW SMALL PARTS WHILE$5 SOLDERING GLUING OR PAINTING MAGNIFIER LAMP WITH MULTI POSITION 39 $3000 / FLEXIBLE ARM 3 DIOPTER LENS FOR 4 liMES MAGNIFICATION Letters Editor Continued page 113 modeling interests first article would like comment guest editorial believe Mr Waterman expressed views ac tive instructors very well us spend flying time teaching others fly know what happens student pilot brings out wrong airplane takes twice long him learn fly dont believe however student cannot learn ship has ailerons Take Goldberg Eaglet example sincerely believe probably best trainer market have taught lots folks fly ailerons definitely hinderance learning process dont feel need go back days Smog Hog applaud Mr Watermans views keeping things simple beginner Anthony Stevens Knoxville TN am writing overwhelming apprecia tion guest editorial April 1985 issue Jim Waterman really enoyed Frankly stand behind him 100% Let explain first trainer Little Stik 6-ft wing flatbottomed airfoil polydihedral 576 sq area truly basic trainer would recover full stall about 10 ft plane crashed servo arm rudder came off turn left full rudder locked-in friend gave Box Fly 20 put big wing it flew better Loops spins snaps could flown yet stable Old-Timer wing broke using glider fuselage switched nodihedral fully-symmetrical-airfoil wing ailerons needed larger power plant got wasnt ready second airplane guest editorial called bumped about quite bit During winter fixed up after wards could fly much better However still herkey-jerkey ailerons doing better before crashed five times first switched ailerons took year lots patience really bruised ego learn tt fly Dont think stayed basic trainer never crashed due pilot error would have faster learning session Its good thing really love RCing because greenhorns would have given up long time ago Chris Allen Pittsburg CA Although enjoy Model Aviation disappointed aggravated totally honest little mad after reading guest editorial April 1985 edition got impression guest editor little envious skill level required fly Pattern Racing ship particularly disturbed remark us fly Pattern Racing models cannot under stand needs beginners us start somewhere us successful first flying session totally mishaps save breaking couple props hangup Antic Bipes Sopwith Pups fine Go sport enjoy covers variety aircraft types varying skill requirements Once beginner present have six trainees has reached skill level competently fly trainer respect choice models continue assist long think needs Instructors determined type aircraft fly Instructors born David C Lassiter Aulander NC Safety/Preston Continued page 20 radio expert among contributing editors Model Aviation last comment concerns radio inter ference Im also going buck George Myers Ive several let ters asking opinion RC chan nels should avoided because inter ference other channels really dont know answer However Radio Technique column ap peared April 1985 issue page 40 George did mention subject radio interference also referenced number previous columns discussed subject have ques tions about interference first check back issues magazine may find answers seek Also dont forget District Frequency Coordina tor people appointed pin point local problems names addresses can found head District VPs column AMA News section magazine Have another safe month John Preston 12235 Tilden wood Dr Rockville MD 20852 M lies-Atwood/Reese Continued page 30 airplane flew nicely another 30 seconds little nervous looped rolled about sky little green airplane needed just another foot altitude complete split-S told just wasnt day inspection didnt appear badly damaged landing gear bent lower cowl popped loose nothing else appeared broken repaired cowl 5-mm epoxy tried again time going touch As soon airbne Continued page 118 September 1985115