Gary Shaw J UNKBOX COMPRESSOR Closing book read great concern article entitled Junkbox Air Compressor appeared November 92 issue Model Aviation article described innovative cost-effective ways use what find around house local junkyard build high-pressure highvolume compressed air delivery system Since article published MA has carried several letters written editor modelers significant compressed gas experience letters warn numerous hazards related use such homebuilt system Although definitely creative modelers know save money have agree system presented will become unsafe Before reaching conclusion stomach felt right away spent several hours researching what properly built designed system would utilize appropriate consideration given applicable federal laws standards Given inherent dangers involved working compressed gases finding standards did take long Information discovered ranged safety bulletins describing hazards refilling compressed refrigerant halogenated hydrocarbons gas cylinders detailed specifications components safety tolerances compare component speci fications tolerances what find junkbox tempted put home-built compressor alarms should going off time grab piece scrap heap Hazards range internal flash fires caused leaking crankcase oil vaporizes ignites explodes during compression strokes unrated tubing bursting heat generated under pressure 50 psi air-discharge temperature will around 3000F 100 psi will 5000F sufficient melt soft solder plastics found scrap heap hazards described above lead cautious man simple conclusion unless really homework prior building compressor probably have accident waiting happen youre gambler ready throw dice An acceptable alternative would pur chase small compressor about $150 DOT-approved portable air tank local automotive store about $30 small price pay safety peace mind still havent convinced what want buildor may have already builtis unsafe Ive included addresses can obtain information May1993 35 Smfety Comes First 85 Twin Lakes Circle Atoka TN 38004 EiIu~ 1 / SIZEUSEPRICE 57X31159 6u21159 63X4395 65 X292395 65 X372395 65 X503395 65X553395 65X603395 65X653395 7x315159 7X415159 7X5159 7X6159 7X7159 7X8159 7X9159 7X10159 78X414395 78X66395 78 X76395 8X735395 8X414179 8X5179 8X6179 8X7179 8X8179 8X9179 8X10179 9X416199 9X516199 9X6199 9X7199 APC PROPELLERS SIZEUSE PRICE 9X0199 9X9199 9X10199 925 X 50 .. 4395 925X525 4395 925 X 55 .. 4395 925X575 4395 925 X 60 .. 4395 95 X 6SN .. 5395 95 X 7ON .. 5395 95 X 75N .. 5395 95 X 8ON .. 5395 95 X 85N .. 5395 9X65 395 9X75 395 9X85 395 95 X45 29 10X3229 10x4229 10X5229 10X6229 10X7229 lOXO229 10X9229 10X10229 105X45 11395 11X3249 11X4249 11XS249 11X6249 11X7249 11X8249 Sound Suppression Design High Thrust Efficiency Long Fiber Advanced Composite Material Continually Evolving Design Manufactured Landing Products PO Box 938 Knight Landing CA 95645 SIZEUSE PRICE 11X9249 12X6209 12X7299 12X0289 11X107795 liXil7795 11 X127795 11X12W7795 11 X137795 11X147795 115X48209 1225 X 3758349 12X97795 12X9W7795 12X107795 12X10W7795 12X117795 12X11N7795 12X1157795 12X127795 12X1257795 12X12N7795 12X137795 12X13N7795 12X147795 125X97795 125X107795 125X117795 125X1157795 125X127795 125 X1257795 125X137795 SIZEUSE PRICE 1306425 1307425 1305425 13097795 130107795 130117795 13X13N9795 13X13SN.9795 1350971295 13501071295 1350 115N 71295 1350125 101295 1350133 101295 135 X 135 10 . 1295 135X14 101295 135 0 14W 1295 14XSN1295 14061295 14081295 140101295 140121295 14X12N..10.1295 14013101295 14X13N101295 140 135 .. 10 . 1295 14X135N.10.1295 14X14101295 14X14N101295 1440105 10 1295 144012 101295 144013 101295 145 X 14N . 10 . 1295 SIZEUSE PRICE 145 X 14SN 10. 1295 1508101295 15010101295 15011101295 15012101295 16081295 160101295 160121295 160141295 160161295 90 6PPusher 395 1OX6PPusher 395 100 7P . . Pusher lox 8P .. Pusher 395 11 X6PPusher 395 11 07P .. Pusher 395 140 OP . . Pusher 1295 MULTI-BLADE 2 Replaceable Blades 18082200 18X102200 18012122200 180142200 160162200 18X182200 20X8122500 200102500 200122500 200142500 200162500 200182500 SIZEUSE PRICE 200202500 21 X 122500 22003100 22010133100 22012133100 220143100 220163100 220183100 22X203100 220223100 240103800 240123800 24x143800 240163800 240183800 24X203800 240223800 2 Elude Huh 18 103000 2 Blude Hub 20- 21 3500 2 Elude Huh 22 . 4000 2 Blude Huh 24 . 6000 MULTI-BLADE 3 Replaceable Blades 170103300 180103300 190 113300 20X10133700 20012133700 200143700 21X103700 210123700 SIZEUSE PRICE 220104500 220124500 220144500 220164500 240105500 240125500 240145500 240165500 3 Blade Huh 17-10 4500 3 Blade Hub 20-21 5500 3 Elude Hub 226500 3 Blade Hub 249000 CUGSEIIT USAGES 1549 Free Fliuhi 2iSCumbut 3ra-lupylun 425 Pylon 40 Pylon 0Se Combut 7Au Putters CL Stunt 912u Wurbind 10120 Petteno 1140 Fneu Plight 1235CC 1370CC 1421-25 Fnee Fliulit 1515 Free Flight 1029 Free Fliulit Contact local hobby dealer first doesnt have what need order direct England Enterprises 916-661-6515 -l1981 Hazards Refilling Compressed Refrigerant Halo genated Hydrocarbons Gas Cylinders Compressed Gas Association inc 1235 Jefferson Davis Highway Arlington VA 22202 2 ASME Unfired Pressure Vessel Code American Society Mechanical Engineers 345 East 47th St New York NY 10017 3 ANSIICSAICGA V- 1 Compressed Gas Cylinder Valve Outlet Inlet Connections Compressed Gas Association Inc 1235 Jefferson Davis Highway Arlington VA 22202 4 ANSI B1931981 Safety Standard Compressors Process industries American Society Mechanical Engineers 345 East 47th Street New York NY 10017 Broken Prop Perils title article published Imperial R/C Club newsletter edited Bob Hunter article appeared fall issue written Bob dealt props go break think go forward think again Bob describes danger follows have number incidents recently props breaking flight during mn-up ground blade suddenly separates propeller does go Most people would reply will go forward because thrust force exerted propeller comes off engine intact often happens four-stroke engines backfire will go forward separated blade centrifugal force acting blade least 100 times great thrust force So dangerous place blade separates along side plane spinning prop Just dangerous flying prop blade take example 11-inch prop turning 13000 rpm typical highperformance engines separated blade will fly off 340 feet per second 232 mph spinning 216 rpm missile somewhat like things Ninja warriors throw movies much faster good fasthall pitcher can throw baseball around 100 mph however prop blade traveling over twice fast blade dangerous lethal should make us think about what goes pits someone running engine up adjusting needle valve maximum rpm dont stand near plane arc spinning prop Certainly dont working airplane right next him airplane may get speared Maybe would better high-throttle operations performed away pit area least well forward pit concrete no people airplanes plane spinning prop Bob describes peril see pilots subject themselves time go flying field Have ever field seen half field gathered around new arrivals plane its started What think people get upset about planes engine starts screaming noise prop arc Okay okay its propwash clean airplane flight box new guys propwash going dust Predictably two members will exit circle move equipment others stand prop arc waiting get whacked remember having read past safety columns not-so-longago variety stories props embedded chest chopped fingers held together pinsall victims loose broken propellers Question Would let young child stand prop arc nice Props have no conscience Safety Now title letter written Karl Valasek Western Springs Illinois forwarded MA editorial office Karl following things say about starting systems idea way past due safety hasnt emphasis placed efficient system starting model planes behind propeller fellows field have developed switch Sullivan starter attached end tote box has folding legs motor automatically 36 Model Aviation jSI uw LEIU WE ARE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHUTS 36 48 30 ALU STICKS 36 48 1/16x233 3/32 x 240 1/8x243 3/16249 l/4x256 1/32337 1/20x337 1/16x3374931 3/32 x 3445837 1/8x3557445 3/16x3638455 1/4x3759861 5/16x387115 3/839012871 1/23114180 3/43170200 1/16x4587648 3/324729756 1/848210966 3/16x49612675 1/4411513984 3/84170235144 1/2x4235273200 MATCHED SHEETS 42 3/324109 1/8 x4129 3/16x4144 114 34155 1/16x1/410 1/163/811 1/161/215 3/32x1/412 3/323/813 3/321/217 1/8x1/809 1/8x1/412 1/83/813 1/81/218 3/16x3/1612 3/163/818 3/161/222 1/4X1/418 1/4x3/821 1/41/222 1/43/434 1/4x -142 5/16x5/1623 3/83/829 3/8x1/233 3/8 x3/444 3/8x184 1/2x1/238 1/23/448 1/2x160 5/Ex5/852 3/43/475 BALSA HOT LINE Cell 806 745 6394 10. 6pm Central Time CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% VP BALSA TRIANGLES 36 141425 38 3830 121238 34 3445 159 BALUPLAI4KS36 1190 1,2157 13319 14293 11/23302 11/24398 22231 23338 24475 33915 34715 TAPERED SHUTS36 1/42 65 143 85 382 88 383 99 123120 serious modeler want performance LIGHT 4-6 LB WOOD 36 1/32x378 1/2078 1/1678 3/3293 1/0114 3/16132 1/4157 3/0188 1/2238 3/4375 1532 1/163123 3/32149 hO169 316197 14237 3/8357 1/2482 18 19 24 19 21 31 264 28 32 45 57 30 39 49 58 73 55 66 82 70 98 LONESTAR EPOXY INSTANT CLUL BozLISI 10991 oz Thick300 5 M/76691 oz Thin300 15 Mm6692oz Thick550 3DM/n6692oz Thin550 TRAIL INC EDGE 36 1/4132 5/161 1/4 39 3/8 11/2 46 12270 must try 4-6 lb balsa IASSWOOD48 3/183/1828 3/181430 3/163/838 3/161/246 3/183/460 1/41/442 1/43/849 1/43/490 3/83/860 3/81270 3/83490 1/21/200 123/4100 BUNDLE DEALS 20-1/16x336699 20-1/1 6x4x361035 20-3/32336875 15-3/32436999 15-1/8x336775 10-1/8436775 1S-3/1 63x36940 10-3/164x36899 10-1/43x36899 10-1/44x361090 1 0-3/8x336890 5-3/8x436655 5-1/2336540 5-1/24361110 10-3/324x48930 5-1 /8x4x48525 5-3/16448620 51 /4x448680 HARD MAPLE 1/4 383/8 3/8 12 3/834 1 234 18 40 45 00 58 68 BIRCH DOWELS 36 1/812 3/1617 1/419 5/1625 3/832 3 PLY BIRCH 48 1/64x12838 l32x12550 1116x12550 1I8x12496 S PLYBIRcH 48 3/32x 12725 1/8 12925 363/1612625 1/412650 643/8x12750 811/2x12900 LflEPLY48GROOVED LG MOUNTS 12iehes 178 3803I8x3/411/8145 45 50 i/O 6 1/8 12 l4x6 1/4 12 LONE STAR MODELS 1623 57th St Lubbock TX 79412 ConS 48 States Handling Charge pay UPS Add $400 COD $500 extra PP APO FPO accept VISA MC 0/scover persona/ checks COD 6/4% tax Texas US currency or/y Mm wood order $1000 UV. turns off nose plane pressed against released detachable holders top tote box model person especially us older ones can work painful kneelingand safety Perhaps manufacturers will see article get busy critical safety problems guess dont need add anything Karls letter except say agree him Id appreciate some comments manufacturers may have product fit bill clubs might have developed other ideas Editors note Kranking Safety Starter made advertisersis commercially available device does same job Can see Such subject column entitled Safety Zone John Kenna appeared #10 issue newsletter Azalea City Model Aeronautics Club Frits Jetten editor John writes following months topic flying visible plane beginners shocked find planes color scheme looks great ground completely disappears air Most longtime RC aircraft pilots have learned sometimes hard way have visible plane following rules apply Finish top bottom wing completely differently both color scheme Use contrasting colors next other such red/yellow red/white black/orange Avoid abundance small markings sky details will visible Dont use large amounts white blue colors will blend cloudy blue sky possible avoid large amounts gray black especially low-visibility gray used jets designing next color scheme keep rules mind plane will visible possibly preventing pilotinduced crash due loss orientation Keep mind doesnt matter much sky above model trying recover disorientation Its amount sky beneath counts Take Johns advice use bright contrasting colors keep out trouble goes Recently Morris Burner Helena Montana Hying Tigers called pass lessons-learned story involving near loss favorite aircraft Road Runner Morris described nice day field thoroughly engaged wringing out new SuperTigre engine installed plane flying about 250 feet Without warning plane developed mind its own described sick feeling get move stick way plane goes other Having experienced radio interference field past occasions thought ran towards plane somehow interference would overridden powerful transmitter signal Alas case Road Runner leveled out its radical gyrations shot across nearby lake about warp factor 10 plane now appearing yellow dot quickly becoming smaller distance stood end runway pondered Should tell builder/nephew/ author column plane gone Suddenly faint voice pits yelled out Try pulling antenna up Instantly antenna up sticks working retrieve model merely distant soundno color Morriss relief sound became louder distant dot grew yellow Road Runner Morris went describe un eventful intentional straight-in approach landing As rest day last seen walking toward Porta-John moral story obvious Check antenna before flying never tell builder/nephew/columnist story like might print Im looking forward summer Safe Flying See next month * May1993 37 * NEW * Hundreds new sizes accessories bushing materials Send #10 SASE latest catalog SPRUCE STICKS 3648 18 1/81725 1/8 1/42028 18 3/82232 3/16 3/162839 1/4 143450 14 3/84085 1/4x 1/24565 3/8 3/84989 3/81/26077 1/2 1/25888 123/47597 SPRUCE TRIANGLES 3/83/8 121/2 34
Edition: Model Aviation - 1993/05
Page Numbers: 35, 36, 37
Gary Shaw J UNKBOX COMPRESSOR Closing book read great concern article entitled Junkbox Air Compressor appeared November 92 issue Model Aviation article described innovative cost-effective ways use what find around house local junkyard build high-pressure highvolume compressed air delivery system Since article published MA has carried several letters written editor modelers significant compressed gas experience letters warn numerous hazards related use such homebuilt system Although definitely creative modelers know save money have agree system presented will become unsafe Before reaching conclusion stomach felt right away spent several hours researching what properly built designed system would utilize appropriate consideration given applicable federal laws standards Given inherent dangers involved working compressed gases finding standards did take long Information discovered ranged safety bulletins describing hazards refilling compressed refrigerant halogenated hydrocarbons gas cylinders detailed specifications components safety tolerances compare component speci fications tolerances what find junkbox tempted put home-built compressor alarms should going off time grab piece scrap heap Hazards range internal flash fires caused leaking crankcase oil vaporizes ignites explodes during compression strokes unrated tubing bursting heat generated under pressure 50 psi air-discharge temperature will around 3000F 100 psi will 5000F sufficient melt soft solder plastics found scrap heap hazards described above lead cautious man simple conclusion unless really homework prior building compressor probably have accident waiting happen youre gambler ready throw dice An acceptable alternative would pur chase small compressor about $150 DOT-approved portable air tank local automotive store about $30 small price pay safety peace mind still havent convinced what want buildor may have already builtis unsafe Ive included addresses can obtain information May1993 35 Smfety Comes First 85 Twin Lakes Circle Atoka TN 38004 EiIu~ 1 / SIZEUSEPRICE 57X31159 6u21159 63X4395 65 X292395 65 X372395 65 X503395 65X553395 65X603395 65X653395 7x315159 7X415159 7X5159 7X6159 7X7159 7X8159 7X9159 7X10159 78X414395 78X66395 78 X76395 8X735395 8X414179 8X5179 8X6179 8X7179 8X8179 8X9179 8X10179 9X416199 9X516199 9X6199 9X7199 APC PROPELLERS SIZEUSE PRICE 9X0199 9X9199 9X10199 925 X 50 .. 4395 925X525 4395 925 X 55 .. 4395 925X575 4395 925 X 60 .. 4395 95 X 6SN .. 5395 95 X 7ON .. 5395 95 X 75N .. 5395 95 X 8ON .. 5395 95 X 85N .. 5395 9X65 395 9X75 395 9X85 395 95 X45 29 10X3229 10x4229 10X5229 10X6229 10X7229 lOXO229 10X9229 10X10229 105X45 11395 11X3249 11X4249 11XS249 11X6249 11X7249 11X8249 Sound Suppression Design High Thrust Efficiency Long Fiber Advanced Composite Material Continually Evolving Design Manufactured Landing Products PO Box 938 Knight Landing CA 95645 SIZEUSE PRICE 11X9249 12X6209 12X7299 12X0289 11X107795 liXil7795 11 X127795 11X12W7795 11 X137795 11X147795 115X48209 1225 X 3758349 12X97795 12X9W7795 12X107795 12X10W7795 12X117795 12X11N7795 12X1157795 12X127795 12X1257795 12X12N7795 12X137795 12X13N7795 12X147795 125X97795 125X107795 125X117795 125X1157795 125X127795 125 X1257795 125X137795 SIZEUSE PRICE 1306425 1307425 1305425 13097795 130107795 130117795 13X13N9795 13X13SN.9795 1350971295 13501071295 1350 115N 71295 1350125 101295 1350133 101295 135 X 135 10 . 1295 135X14 101295 135 0 14W 1295 14XSN1295 14061295 14081295 140101295 140121295 14X12N..10.1295 14013101295 14X13N101295 140 135 .. 10 . 1295 14X135N.10.1295 14X14101295 14X14N101295 1440105 10 1295 144012 101295 144013 101295 145 X 14N . 10 . 1295 SIZEUSE PRICE 145 X 14SN 10. 1295 1508101295 15010101295 15011101295 15012101295 16081295 160101295 160121295 160141295 160161295 90 6PPusher 395 1OX6PPusher 395 100 7P . . Pusher lox 8P .. Pusher 395 11 X6PPusher 395 11 07P .. Pusher 395 140 OP . . Pusher 1295 MULTI-BLADE 2 Replaceable Blades 18082200 18X102200 18012122200 180142200 160162200 18X182200 20X8122500 200102500 200122500 200142500 200162500 200182500 SIZEUSE PRICE 200202500 21 X 122500 22003100 22010133100 22012133100 220143100 220163100 220183100 22X203100 220223100 240103800 240123800 24x143800 240163800 240183800 24X203800 240223800 2 Elude Huh 18 103000 2 Blude Hub 20- 21 3500 2 Elude Huh 22 . 4000 2 Blude Huh 24 . 6000 MULTI-BLADE 3 Replaceable Blades 170103300 180103300 190 113300 20X10133700 20012133700 200143700 21X103700 210123700 SIZEUSE PRICE 220104500 220124500 220144500 220164500 240105500 240125500 240145500 240165500 3 Blade Huh 17-10 4500 3 Blade Hub 20-21 5500 3 Elude Hub 226500 3 Blade Hub 249000 CUGSEIIT USAGES 1549 Free Fliuhi 2iSCumbut 3ra-lupylun 425 Pylon 40 Pylon 0Se Combut 7Au Putters CL Stunt 912u Wurbind 10120 Petteno 1140 Fneu Plight 1235CC 1370CC 1421-25 Fnee Fliulit 1515 Free Flight 1029 Free Fliulit Contact local hobby dealer first doesnt have what need order direct England Enterprises 916-661-6515 -l1981 Hazards Refilling Compressed Refrigerant Halo genated Hydrocarbons Gas Cylinders Compressed Gas Association inc 1235 Jefferson Davis Highway Arlington VA 22202 2 ASME Unfired Pressure Vessel Code American Society Mechanical Engineers 345 East 47th St New York NY 10017 3 ANSIICSAICGA V- 1 Compressed Gas Cylinder Valve Outlet Inlet Connections Compressed Gas Association Inc 1235 Jefferson Davis Highway Arlington VA 22202 4 ANSI B1931981 Safety Standard Compressors Process industries American Society Mechanical Engineers 345 East 47th Street New York NY 10017 Broken Prop Perils title article published Imperial R/C Club newsletter edited Bob Hunter article appeared fall issue written Bob dealt props go break think go forward think again Bob describes danger follows have number incidents recently props breaking flight during mn-up ground blade suddenly separates propeller does go Most people would reply will go forward because thrust force exerted propeller comes off engine intact often happens four-stroke engines backfire will go forward separated blade centrifugal force acting blade least 100 times great thrust force So dangerous place blade separates along side plane spinning prop Just dangerous flying prop blade take example 11-inch prop turning 13000 rpm typical highperformance engines separated blade will fly off 340 feet per second 232 mph spinning 216 rpm missile somewhat like things Ninja warriors throw movies much faster good fasthall pitcher can throw baseball around 100 mph however prop blade traveling over twice fast blade dangerous lethal should make us think about what goes pits someone running engine up adjusting needle valve maximum rpm dont stand near plane arc spinning prop Certainly dont working airplane right next him airplane may get speared Maybe would better high-throttle operations performed away pit area least well forward pit concrete no people airplanes plane spinning prop Bob describes peril see pilots subject themselves time go flying field Have ever field seen half field gathered around new arrivals plane its started What think people get upset about planes engine starts screaming noise prop arc Okay okay its propwash clean airplane flight box new guys propwash going dust Predictably two members will exit circle move equipment others stand prop arc waiting get whacked remember having read past safety columns not-so-longago variety stories props embedded chest chopped fingers held together pinsall victims loose broken propellers Question Would let young child stand prop arc nice Props have no conscience Safety Now title letter written Karl Valasek Western Springs Illinois forwarded MA editorial office Karl following things say about starting systems idea way past due safety hasnt emphasis placed efficient system starting model planes behind propeller fellows field have developed switch Sullivan starter attached end tote box has folding legs motor automatically 36 Model Aviation jSI uw LEIU WE ARE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHUTS 36 48 30 ALU STICKS 36 48 1/16x233 3/32 x 240 1/8x243 3/16249 l/4x256 1/32337 1/20x337 1/16x3374931 3/32 x 3445837 1/8x3557445 3/16x3638455 1/4x3759861 5/16x387115 3/839012871 1/23114180 3/43170200 1/16x4587648 3/324729756 1/848210966 3/16x49612675 1/4411513984 3/84170235144 1/2x4235273200 MATCHED SHEETS 42 3/324109 1/8 x4129 3/16x4144 114 34155 1/16x1/410 1/163/811 1/161/215 3/32x1/412 3/323/813 3/321/217 1/8x1/809 1/8x1/412 1/83/813 1/81/218 3/16x3/1612 3/163/818 3/161/222 1/4X1/418 1/4x3/821 1/41/222 1/43/434 1/4x -142 5/16x5/1623 3/83/829 3/8x1/233 3/8 x3/444 3/8x184 1/2x1/238 1/23/448 1/2x160 5/Ex5/852 3/43/475 BALSA HOT LINE Cell 806 745 6394 10. 6pm Central Time CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% VP BALSA TRIANGLES 36 141425 38 3830 121238 34 3445 159 BALUPLAI4KS36 1190 1,2157 13319 14293 11/23302 11/24398 22231 23338 24475 33915 34715 TAPERED SHUTS36 1/42 65 143 85 382 88 383 99 123120 serious modeler want performance LIGHT 4-6 LB WOOD 36 1/32x378 1/2078 1/1678 3/3293 1/0114 3/16132 1/4157 3/0188 1/2238 3/4375 1532 1/163123 3/32149 hO169 316197 14237 3/8357 1/2482 18 19 24 19 21 31 264 28 32 45 57 30 39 49 58 73 55 66 82 70 98 LONESTAR EPOXY INSTANT CLUL BozLISI 10991 oz Thick300 5 M/76691 oz Thin300 15 Mm6692oz Thick550 3DM/n6692oz Thin550 TRAIL INC EDGE 36 1/4132 5/161 1/4 39 3/8 11/2 46 12270 must try 4-6 lb balsa IASSWOOD48 3/183/1828 3/181430 3/163/838 3/161/246 3/183/460 1/41/442 1/43/849 1/43/490 3/83/860 3/81270 3/83490 1/21/200 123/4100 BUNDLE DEALS 20-1/16x336699 20-1/1 6x4x361035 20-3/32336875 15-3/32436999 15-1/8x336775 10-1/8436775 1S-3/1 63x36940 10-3/164x36899 10-1/43x36899 10-1/44x361090 1 0-3/8x336890 5-3/8x436655 5-1/2336540 5-1/24361110 10-3/324x48930 5-1 /8x4x48525 5-3/16448620 51 /4x448680 HARD MAPLE 1/4 383/8 3/8 12 3/834 1 234 18 40 45 00 58 68 BIRCH DOWELS 36 1/812 3/1617 1/419 5/1625 3/832 3 PLY BIRCH 48 1/64x12838 l32x12550 1116x12550 1I8x12496 S PLYBIRcH 48 3/32x 12725 1/8 12925 363/1612625 1/412650 643/8x12750 811/2x12900 LflEPLY48GROOVED LG MOUNTS 12iehes 178 3803I8x3/411/8145 45 50 i/O 6 1/8 12 l4x6 1/4 12 LONE STAR MODELS 1623 57th St Lubbock TX 79412 ConS 48 States Handling Charge pay UPS Add $400 COD $500 extra PP APO FPO accept VISA MC 0/scover persona/ checks COD 6/4% tax Texas US currency or/y Mm wood order $1000 UV. turns off nose plane pressed against released detachable holders top tote box model person especially us older ones can work painful kneelingand safety Perhaps manufacturers will see article get busy critical safety problems guess dont need add anything Karls letter except say agree him Id appreciate some comments manufacturers may have product fit bill clubs might have developed other ideas Editors note Kranking Safety Starter made advertisersis commercially available device does same job Can see Such subject column entitled Safety Zone John Kenna appeared #10 issue newsletter Azalea City Model Aeronautics Club Frits Jetten editor John writes following months topic flying visible plane beginners shocked find planes color scheme looks great ground completely disappears air Most longtime RC aircraft pilots have learned sometimes hard way have visible plane following rules apply Finish top bottom wing completely differently both color scheme Use contrasting colors next other such red/yellow red/white black/orange Avoid abundance small markings sky details will visible Dont use large amounts white blue colors will blend cloudy blue sky possible avoid large amounts gray black especially low-visibility gray used jets designing next color scheme keep rules mind plane will visible possibly preventing pilotinduced crash due loss orientation Keep mind doesnt matter much sky above model trying recover disorientation Its amount sky beneath counts Take Johns advice use bright contrasting colors keep out trouble goes Recently Morris Burner Helena Montana Hying Tigers called pass lessons-learned story involving near loss favorite aircraft Road Runner Morris described nice day field thoroughly engaged wringing out new SuperTigre engine installed plane flying about 250 feet Without warning plane developed mind its own described sick feeling get move stick way plane goes other Having experienced radio interference field past occasions thought ran towards plane somehow interference would overridden powerful transmitter signal Alas case Road Runner leveled out its radical gyrations shot across nearby lake about warp factor 10 plane now appearing yellow dot quickly becoming smaller distance stood end runway pondered Should tell builder/nephew/ author column plane gone Suddenly faint voice pits yelled out Try pulling antenna up Instantly antenna up sticks working retrieve model merely distant soundno color Morriss relief sound became louder distant dot grew yellow Road Runner Morris went describe un eventful intentional straight-in approach landing As rest day last seen walking toward Porta-John moral story obvious Check antenna before flying never tell builder/nephew/columnist story like might print Im looking forward summer Safe Flying See next month * May1993 37 * NEW * Hundreds new sizes accessories bushing materials Send #10 SASE latest catalog SPRUCE STICKS 3648 18 1/81725 1/8 1/42028 18 3/82232 3/16 3/162839 1/4 143450 14 3/84085 1/4x 1/24565 3/8 3/84989 3/81/26077 1/2 1/25888 123/47597 SPRUCE TRIANGLES 3/83/8 121/2 34
Edition: Model Aviation - 1993/05
Page Numbers: 35, 36, 37
Gary Shaw J UNKBOX COMPRESSOR Closing book read great concern article entitled Junkbox Air Compressor appeared November 92 issue Model Aviation article described innovative cost-effective ways use what find around house local junkyard build high-pressure highvolume compressed air delivery system Since article published MA has carried several letters written editor modelers significant compressed gas experience letters warn numerous hazards related use such homebuilt system Although definitely creative modelers know save money have agree system presented will become unsafe Before reaching conclusion stomach felt right away spent several hours researching what properly built designed system would utilize appropriate consideration given applicable federal laws standards Given inherent dangers involved working compressed gases finding standards did take long Information discovered ranged safety bulletins describing hazards refilling compressed refrigerant halogenated hydrocarbons gas cylinders detailed specifications components safety tolerances compare component speci fications tolerances what find junkbox tempted put home-built compressor alarms should going off time grab piece scrap heap Hazards range internal flash fires caused leaking crankcase oil vaporizes ignites explodes during compression strokes unrated tubing bursting heat generated under pressure 50 psi air-discharge temperature will around 3000F 100 psi will 5000F sufficient melt soft solder plastics found scrap heap hazards described above lead cautious man simple conclusion unless really homework prior building compressor probably have accident waiting happen youre gambler ready throw dice An acceptable alternative would pur chase small compressor about $150 DOT-approved portable air tank local automotive store about $30 small price pay safety peace mind still havent convinced what want buildor may have already builtis unsafe Ive included addresses can obtain information May1993 35 Smfety Comes First 85 Twin Lakes Circle Atoka TN 38004 EiIu~ 1 / SIZEUSEPRICE 57X31159 6u21159 63X4395 65 X292395 65 X372395 65 X503395 65X553395 65X603395 65X653395 7x315159 7X415159 7X5159 7X6159 7X7159 7X8159 7X9159 7X10159 78X414395 78X66395 78 X76395 8X735395 8X414179 8X5179 8X6179 8X7179 8X8179 8X9179 8X10179 9X416199 9X516199 9X6199 9X7199 APC PROPELLERS SIZEUSE PRICE 9X0199 9X9199 9X10199 925 X 50 .. 4395 925X525 4395 925 X 55 .. 4395 925X575 4395 925 X 60 .. 4395 95 X 6SN .. 5395 95 X 7ON .. 5395 95 X 75N .. 5395 95 X 8ON .. 5395 95 X 85N .. 5395 9X65 395 9X75 395 9X85 395 95 X45 29 10X3229 10x4229 10X5229 10X6229 10X7229 lOXO229 10X9229 10X10229 105X45 11395 11X3249 11X4249 11XS249 11X6249 11X7249 11X8249 Sound Suppression Design High Thrust Efficiency Long Fiber Advanced Composite Material Continually Evolving Design Manufactured Landing Products PO Box 938 Knight Landing CA 95645 SIZEUSE PRICE 11X9249 12X6209 12X7299 12X0289 11X107795 liXil7795 11 X127795 11X12W7795 11 X137795 11X147795 115X48209 1225 X 3758349 12X97795 12X9W7795 12X107795 12X10W7795 12X117795 12X11N7795 12X1157795 12X127795 12X1257795 12X12N7795 12X137795 12X13N7795 12X147795 125X97795 125X107795 125X117795 125X1157795 125X127795 125 X1257795 125X137795 SIZEUSE PRICE 1306425 1307425 1305425 13097795 130107795 130117795 13X13N9795 13X13SN.9795 1350971295 13501071295 1350 115N 71295 1350125 101295 1350133 101295 135 X 135 10 . 1295 135X14 101295 135 0 14W 1295 14XSN1295 14061295 14081295 140101295 140121295 14X12N..10.1295 14013101295 14X13N101295 140 135 .. 10 . 1295 14X135N.10.1295 14X14101295 14X14N101295 1440105 10 1295 144012 101295 144013 101295 145 X 14N . 10 . 1295 SIZEUSE PRICE 145 X 14SN 10. 1295 1508101295 15010101295 15011101295 15012101295 16081295 160101295 160121295 160141295 160161295 90 6PPusher 395 1OX6PPusher 395 100 7P . . Pusher lox 8P .. Pusher 395 11 X6PPusher 395 11 07P .. Pusher 395 140 OP . . Pusher 1295 MULTI-BLADE 2 Replaceable Blades 18082200 18X102200 18012122200 180142200 160162200 18X182200 20X8122500 200102500 200122500 200142500 200162500 200182500 SIZEUSE PRICE 200202500 21 X 122500 22003100 22010133100 22012133100 220143100 220163100 220183100 22X203100 220223100 240103800 240123800 24x143800 240163800 240183800 24X203800 240223800 2 Elude Huh 18 103000 2 Blude Hub 20- 21 3500 2 Elude Huh 22 . 4000 2 Blude Huh 24 . 6000 MULTI-BLADE 3 Replaceable Blades 170103300 180103300 190 113300 20X10133700 20012133700 200143700 21X103700 210123700 SIZEUSE PRICE 220104500 220124500 220144500 220164500 240105500 240125500 240145500 240165500 3 Blade Huh 17-10 4500 3 Blade Hub 20-21 5500 3 Elude Hub 226500 3 Blade Hub 249000 CUGSEIIT USAGES 1549 Free Fliuhi 2iSCumbut 3ra-lupylun 425 Pylon 40 Pylon 0Se Combut 7Au Putters CL Stunt 912u Wurbind 10120 Petteno 1140 Fneu Plight 1235CC 1370CC 1421-25 Fnee Fliulit 1515 Free Flight 1029 Free Fliulit Contact local hobby dealer first doesnt have what need order direct England Enterprises 916-661-6515 -l1981 Hazards Refilling Compressed Refrigerant Halo genated Hydrocarbons Gas Cylinders Compressed Gas Association inc 1235 Jefferson Davis Highway Arlington VA 22202 2 ASME Unfired Pressure Vessel Code American Society Mechanical Engineers 345 East 47th St New York NY 10017 3 ANSIICSAICGA V- 1 Compressed Gas Cylinder Valve Outlet Inlet Connections Compressed Gas Association Inc 1235 Jefferson Davis Highway Arlington VA 22202 4 ANSI B1931981 Safety Standard Compressors Process industries American Society Mechanical Engineers 345 East 47th Street New York NY 10017 Broken Prop Perils title article published Imperial R/C Club newsletter edited Bob Hunter article appeared fall issue written Bob dealt props go break think go forward think again Bob describes danger follows have number incidents recently props breaking flight during mn-up ground blade suddenly separates propeller does go Most people would reply will go forward because thrust force exerted propeller comes off engine intact often happens four-stroke engines backfire will go forward separated blade centrifugal force acting blade least 100 times great thrust force So dangerous place blade separates along side plane spinning prop Just dangerous flying prop blade take example 11-inch prop turning 13000 rpm typical highperformance engines separated blade will fly off 340 feet per second 232 mph spinning 216 rpm missile somewhat like things Ninja warriors throw movies much faster good fasthall pitcher can throw baseball around 100 mph however prop blade traveling over twice fast blade dangerous lethal should make us think about what goes pits someone running engine up adjusting needle valve maximum rpm dont stand near plane arc spinning prop Certainly dont working airplane right next him airplane may get speared Maybe would better high-throttle operations performed away pit area least well forward pit concrete no people airplanes plane spinning prop Bob describes peril see pilots subject themselves time go flying field Have ever field seen half field gathered around new arrivals plane its started What think people get upset about planes engine starts screaming noise prop arc Okay okay its propwash clean airplane flight box new guys propwash going dust Predictably two members will exit circle move equipment others stand prop arc waiting get whacked remember having read past safety columns not-so-longago variety stories props embedded chest chopped fingers held together pinsall victims loose broken propellers Question Would let young child stand prop arc nice Props have no conscience Safety Now title letter written Karl Valasek Western Springs Illinois forwarded MA editorial office Karl following things say about starting systems idea way past due safety hasnt emphasis placed efficient system starting model planes behind propeller fellows field have developed switch Sullivan starter attached end tote box has folding legs motor automatically 36 Model Aviation jSI uw LEIU WE ARE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHUTS 36 48 30 ALU STICKS 36 48 1/16x233 3/32 x 240 1/8x243 3/16249 l/4x256 1/32337 1/20x337 1/16x3374931 3/32 x 3445837 1/8x3557445 3/16x3638455 1/4x3759861 5/16x387115 3/839012871 1/23114180 3/43170200 1/16x4587648 3/324729756 1/848210966 3/16x49612675 1/4411513984 3/84170235144 1/2x4235273200 MATCHED SHEETS 42 3/324109 1/8 x4129 3/16x4144 114 34155 1/16x1/410 1/163/811 1/161/215 3/32x1/412 3/323/813 3/321/217 1/8x1/809 1/8x1/412 1/83/813 1/81/218 3/16x3/1612 3/163/818 3/161/222 1/4X1/418 1/4x3/821 1/41/222 1/43/434 1/4x -142 5/16x5/1623 3/83/829 3/8x1/233 3/8 x3/444 3/8x184 1/2x1/238 1/23/448 1/2x160 5/Ex5/852 3/43/475 BALSA HOT LINE Cell 806 745 6394 10. 6pm Central Time CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% VP BALSA TRIANGLES 36 141425 38 3830 121238 34 3445 159 BALUPLAI4KS36 1190 1,2157 13319 14293 11/23302 11/24398 22231 23338 24475 33915 34715 TAPERED SHUTS36 1/42 65 143 85 382 88 383 99 123120 serious modeler want performance LIGHT 4-6 LB WOOD 36 1/32x378 1/2078 1/1678 3/3293 1/0114 3/16132 1/4157 3/0188 1/2238 3/4375 1532 1/163123 3/32149 hO169 316197 14237 3/8357 1/2482 18 19 24 19 21 31 264 28 32 45 57 30 39 49 58 73 55 66 82 70 98 LONESTAR EPOXY INSTANT CLUL BozLISI 10991 oz Thick300 5 M/76691 oz Thin300 15 Mm6692oz Thick550 3DM/n6692oz Thin550 TRAIL INC EDGE 36 1/4132 5/161 1/4 39 3/8 11/2 46 12270 must try 4-6 lb balsa IASSWOOD48 3/183/1828 3/181430 3/163/838 3/161/246 3/183/460 1/41/442 1/43/849 1/43/490 3/83/860 3/81270 3/83490 1/21/200 123/4100 BUNDLE DEALS 20-1/16x336699 20-1/1 6x4x361035 20-3/32336875 15-3/32436999 15-1/8x336775 10-1/8436775 1S-3/1 63x36940 10-3/164x36899 10-1/43x36899 10-1/44x361090 1 0-3/8x336890 5-3/8x436655 5-1/2336540 5-1/24361110 10-3/324x48930 5-1 /8x4x48525 5-3/16448620 51 /4x448680 HARD MAPLE 1/4 383/8 3/8 12 3/834 1 234 18 40 45 00 58 68 BIRCH DOWELS 36 1/812 3/1617 1/419 5/1625 3/832 3 PLY BIRCH 48 1/64x12838 l32x12550 1116x12550 1I8x12496 S PLYBIRcH 48 3/32x 12725 1/8 12925 363/1612625 1/412650 643/8x12750 811/2x12900 LflEPLY48GROOVED LG MOUNTS 12iehes 178 3803I8x3/411/8145 45 50 i/O 6 1/8 12 l4x6 1/4 12 LONE STAR MODELS 1623 57th St Lubbock TX 79412 ConS 48 States Handling Charge pay UPS Add $400 COD $500 extra PP APO FPO accept VISA MC 0/scover persona/ checks COD 6/4% tax Texas US currency or/y Mm wood order $1000 UV. turns off nose plane pressed against released detachable holders top tote box model person especially us older ones can work painful kneelingand safety Perhaps manufacturers will see article get busy critical safety problems guess dont need add anything Karls letter except say agree him Id appreciate some comments manufacturers may have product fit bill clubs might have developed other ideas Editors note Kranking Safety Starter made advertisersis commercially available device does same job Can see Such subject column entitled Safety Zone John Kenna appeared #10 issue newsletter Azalea City Model Aeronautics Club Frits Jetten editor John writes following months topic flying visible plane beginners shocked find planes color scheme looks great ground completely disappears air Most longtime RC aircraft pilots have learned sometimes hard way have visible plane following rules apply Finish top bottom wing completely differently both color scheme Use contrasting colors next other such red/yellow red/white black/orange Avoid abundance small markings sky details will visible Dont use large amounts white blue colors will blend cloudy blue sky possible avoid large amounts gray black especially low-visibility gray used jets designing next color scheme keep rules mind plane will visible possibly preventing pilotinduced crash due loss orientation Keep mind doesnt matter much sky above model trying recover disorientation Its amount sky beneath counts Take Johns advice use bright contrasting colors keep out trouble goes Recently Morris Burner Helena Montana Hying Tigers called pass lessons-learned story involving near loss favorite aircraft Road Runner Morris described nice day field thoroughly engaged wringing out new SuperTigre engine installed plane flying about 250 feet Without warning plane developed mind its own described sick feeling get move stick way plane goes other Having experienced radio interference field past occasions thought ran towards plane somehow interference would overridden powerful transmitter signal Alas case Road Runner leveled out its radical gyrations shot across nearby lake about warp factor 10 plane now appearing yellow dot quickly becoming smaller distance stood end runway pondered Should tell builder/nephew/ author column plane gone Suddenly faint voice pits yelled out Try pulling antenna up Instantly antenna up sticks working retrieve model merely distant soundno color Morriss relief sound became louder distant dot grew yellow Road Runner Morris went describe un eventful intentional straight-in approach landing As rest day last seen walking toward Porta-John moral story obvious Check antenna before flying never tell builder/nephew/columnist story like might print Im looking forward summer Safe Flying See next month * May1993 37 * NEW * Hundreds new sizes accessories bushing materials Send #10 SASE latest catalog SPRUCE STICKS 3648 18 1/81725 1/8 1/42028 18 3/82232 3/16 3/162839 1/4 143450 14 3/84085 1/4x 1/24565 3/8 3/84989 3/81/26077 1/2 1/25888 123/47597 SPRUCE TRIANGLES 3/83/8 121/2 34