Gary Shaw CHANGING OLD RUBBER BANDS May 96 column wrote piece titled Wing Away aircraft transformed itself air-to-ground missile four-year-old older rubber bands main wing suddenly lost elasticityouch post mortem revealed slim pickings Having read story formulated few thoughts own regarding life rubber band longtime engineer modeler Tom Cater Grand Rapids Michigan thought rest us might benefit little some personal observations has personal observation engineer user rubber bands hobby 40 years life rubber band determined foremost amount sunlight falls have observed rubber bands going new breakage after just hours exposure maximum sunlight have always used rubber bands until worn out dismay other fliers have never lost wing flying conditions ranging 900 Fahrenheit l0O Fahrenheit determine rubber band worn out examination cracks deterioration try replace half rubber bands replacement indicated way half rubber bands new untested other half used previously proven flightworthy list factors affecting rubber band life Exposure sunlights ultraviolet light Composition rubber Storage conditions both new used Exposure raw unburned fuel Exposure hot engine gasses Exposure sunlights ultraviolet light experience seems deteriorating factor rubber bands amount ultraviolet light strikes earth given time varies seasons atmospheric conditions Therefore deterioration rate can very different two different days year clear summer days deterioration rate its maximum often length time airplane field combines compound danger broken rubber bands such days often cover airplanes rubber bands rag its flying Under conditions deterioration its greatestpreflight inspection rubber bands advisable Composition rubber have seen some rubber bands turn liquefied substance exposed certain plastics Model fuel dissolves some rubber bands rather quickly wise move buy rubber bands hobby supplier pay product hopefully tested sport buy bargain rubber bands office supply store test airplane Storage conditions both new used As chemically produced products storage above room temperature will reduce shelf life Storing new rubber bands light-tight air tight container room temperature will maximize life good new ones should last 10 years stored way Used rubber bands seem very adversely affected burnt fuel residue oil have found blotting rag good anything ones did fall flew few times winter still flyable spring long spring sun Never leave new rubber bands out sun field Exposure raw unburned fuel Raw fuel nitromethane hard rubber bands well aircraft finishes Contact between two should avoided Exposure hot engine gasses Hot engine-exhaust gasses can heat rubber bands As become heated lose elasticity become softer until become hot melt engines muffler exhaust should flow over rubber bands Check before mounting engine Cold has experience rubber bands will work much colder temperatures pilot will cold temperatures rubber bands will become stiff advisable put warm avoid unnecessary stress both rubber band aircraft Having read Toms comments compared own experiences would have agreehis observations right mark although would like add extra emphasis obtaining quality rubber bands quality rubber bands always seems vary greatly ones purchase hobby shop sure stretch few before buy Check random sample cracks yellowing before purchase make sure store aware problems next modeler wont end up Again Tom mentioned Id recommend purchase use bands hobby shop Once bands use airplane personal policy changing doubtthrow out Theyre just too cheap worry about results potentially disastrous dont have knowledge desire care like Tom does stop consider much rubber band costs compared cost replacing airplane reasonable person would have agree risk using over over again doesnt make good sense simple analogy involves comparing much costs put gas car month cost motor oil same period Which fluid costs less use per mile answer oil Which will damage engine isnt maintained proper manner answer oil Which itemfuel rubber bandsis less expensive per flight has greatest potential damage goes bad Remember can always glide model down engine quits So comparing damage potential rubber bands motor oil think its wise push margins safety either dont Avoid some grief discard rubber bands end day Sticker Requirements reading through AMA National Newsletter recently ran across piece should interest us since relates improved radio technologies As written Bob Underwood As 1 January 1995 so-called sticker requirement dropped AMA Safety Code Since March 1 1992 manufacturers have required meet narrow-band transmitter specifications given until March 1 1993 clear existing October 1996 37 50 3050 4661 4965 6074 Sisso6090 3/0s286110 1/2523011042143 1/32 x 336 43 50 60 1/20 x 336 43 50 60 1/16 s 336 44 50 60 3/325343 52 61 67 1/85352 63 73 04 3/165362 76 64 101 1/4s376 04113136 5/16x3199152 3/Ox 3105115140170 1/2s3135150175205 3/4x3225310 1/32s456667992 1/20s456607992 1/16s456607992 3/32s46002106114 1/0s47693112134 3/16x467109140150 1/4x4196152162179 5/16x4102234 3/Ox 4165210239265 1/2s4249205315336 3/4x4350471 MATCHED SHEETS 42 48 3/32x4125142 1/0x4150169 3/16s4104109 1/454176205 BIRCH DOWELS36 1/616 3/1617 1/420 5/1627 3/037 1/254 5/674 AILERONS3648 1/4515762 1/4s1-1/46590 1/4x1-1/274105 1/4s200115 5/16s1-1/474105 5/16x1-1/275106 5/16x266120 3/Osl-1/460115 3/6x1-1/263116 3/Ox 295135 1/2x1-1/295140 1/252106150 1/4x275 1/4s3109 3/0x290 3/6x3131 1/253154 ADO FOR SHAPES LEA 0/05 OBOE 2530 SPRUCE TRIANGLES 36 3/6x3/654 1/2o1/275 T/4s5/496 1/lOx 1/2 3/32 SQ 3/32s 1/4 3/3253/0 3/32x1/2 1/8 SQ 1/0x3/16 1/051/4 1/Ox 3/6 1/Ox 1/2 1/653/4 1/651 3/16 SQ 3/165 1/4 3/1653/6 3/lOx 1/2 3/1653/4 3/1651 1/4 SQ 1/453/0 1/451/2 1/453/4 1/45 1 5/16 50 3/6 SQ 3/851/2 3/653/4 3/051 1/2 SQ 1/253/4 1/251 5/6 SQ 3/4 SQ 3/451 BUNDLE DEALS 20 1/16o3 203/32s3 151/6 53 153/1653 101/453 103/653 51/2 53 20 1/165 4 10 1/lOx 4 153/32s4 103/32 54 101/0 54 51/054 103/1654 53/1654 101/454 51/4x4 53/0x4 51/2o4 TRIANGLES 1/4 3/6 1/2 3/4 1-1/2 10 10 12 13 17 11 14 15 19 11 13 14 15 21 20 35 14 16 21 24 30 30 22 27 29 42 52 27 36 40 53 67 49 60 70 00 01 90 36 799 970 075 1050 075 1050 695 1235 1150 075 1000 1400 950 1300 21 23 27 36 45 23 27 20 36 45 59 30 33 41 50 70 35 45 57 60 06 64 02 104 06 111 132 48 900 1075 625 735 035 36 29 33 40 54 60 131 225 48 119 s119 1 70119 93144 114175 s3132292 1/4 53157237 3/653160307I. 1/2s3230302 3/45 3375519 153532719 1/32x4123160co 1/2054123160c 1/1654123160 3/3254149232 1/0s41692162 3/1654197360.. 1/4542373321 3/0s431575163 1/2s4402600 4-6/5 wssOSs5/5crl5axila5Oity/ SUPERIOR LITE1224 48 1/Ox 6250395 1/8s12395750 1/4512495950 LITE PLY1224 48 1/0 sO100125 235 1/Os 12125235 450 1/45 6125175 340 1/45 12175345 650 3 PLY BIRCH 122448 1/64x6140275495 1/64512279510959 1/32 sO 95160325 1/32o12100335635 1/1056 95100325 1/lOs 12160335625 1/OxO 95100335 1/Os 12180335650 4 PLY BIRCH 122448 3/16 sO 100215345 3/16o12 215 345 665 S PLY BIRCH 122448 3/3256135260490 3/32512260500695 1/056145200525 1/Os 12260550950 1/4x0125250300 1/4s12230300725 7 PLY BIRCH 122448 3/OxO 150 265 525 3/Os 12 2655501060 8 PLY BIRCH 122448 1/2s0200350 575 1/2x 123505001125 HARD MAPLE18 1/4x1/445 1/4o3/050 1/4o1/256 3/0o3/050 3/Oxl/256 3/Os 3/4 65 3/65175 3/Osl-1/2115 1/2s1/275 70 5/6o3/4 05 3/4s3/4 92 SPRUCE/ BASS3648 60" 1/16x1/42430 3/32x 1/42539 1/0 SQ2129 1/Ool/4-l2036 1/0o3/O3546 1/Ool/24155 1/0o3/44763 3/10502030 3/1653/04053 3/16x1/2LU4604 3/1653/4A6506 1/4 SQ4557100 1/453/05309 1/451/20101130 1/453/403110100 3/6 SQ6405130 3/051/27591154 1/2 SQ05105100 1/253/494125 200 ADD $550 EXTRA FOR PACKACINO GROOVED LG MOUNTS 3/053/41/050 3/053/45/3250 1/2s3/43/1O55 WING SKINS3B36 1/32512479 535 1/29512479 535 1/lOs 12470 535 3/32x12579 645 TRAILING EDGES36 1/Osl/229 3/1653/435 1/45139 5/1651-1/450 3/651-1/2 56 1/2x2 00 EPOXY 4-1/2 02 9 02 5 Minute425669 15 Minute425669 30 Minute425669 2 Hour425669 20 Minute429040 INSTANT GLUE 1/2 orGE105 1 sz Thin GF300 2sz Thin GF550 Ooz Thin GF1650 1/2 oz Extra Thick200 1 oz Extra thick330 2 os Extra Thick600 O sz Extra thick1800 ODORLESS FOR FOAM 1/2 oz Thin GE425 1 ox Thin GE705 2os Thin GE1305 2oz Accelerator315 Osz Acc Retill695 Exttips6149 Ext tips o tine 6149 INFO & HELP 806-745-6394 ORDERS ONL 1-800-687-5555 24 HR FAX 806-745-6483 Cool 40 State Hanoting Charge $650 pay UPS Add $550 CQDISEND MAIL LONE STAR MODELS $800 extra P6 APO FPO accept Vsa MC Qscooer personal checks Ion COD 6/s % lax n Texas US currency Mn wood order $rsod ORDERS TO Rt9 Box 437 Lubbock IX 79423 stock Therefore Eransmitter produced after March 1 1992 purchased after March 1 1993 may considered narrow band Contest directors may wish consult pages 13-15 Membership Manual guidance concerning transmitters receivers Rule 412 page 13 recommends Contest Directors club officers require tests implement special frequency control arrangements may necessary reduce probability harmful interference among RC systems Within document will find empirical tests both transmitters receivers Additionally AMA equipment available through AMA district Frequency Coordinator Vice President will aid frequency management should noted primary problems inherent use older wide-band equipment center around receivers Since FCC does require type acceptance receivers complicated laboratory test necessary determine wether meet narrowband specifications course left date manufacture empirical test found page 14 Membership Manual bill sale indicating unit purchased after March 1 1993 may also helpful guide Finally Contest Directors will find good portion equipment being used will still carry gold RCMA sticker Some AMA members continuing have equipment tested both manufacturers independent sticker stations key Contest Directors however AMA Safety Code no longer contains goldsticker requirement next important date consideration March 1 1998 time older wide-band transmitters will become illegal FCC regulation Thats monththanks mail hope have having great flying season Isnt time start thinking about what Santa should bring Christmas IN CONTROL Z7 Losing control can nightmare wrong response given command can take its toll model nerves wallet Radio South know feel about hobby too avid RC enthusiasts nearly half century combined experience modeling radio repair So avoid inflated repair costs undue service time Radio South fast economical in-house radio service can depend Radio South customer satisfaction isnt just motto Its way life Let us put back control FB ne JAIRTRONIOS 3702 N Pace Pensacola FL 32505 repair information 904 434-0909 1-800-962-7802 Toll Free Order Line lOrders Only Pleasell 38 Model Aviation
Edition: Model Aviation - 1996/10
Page Numbers: 37, 38
Gary Shaw CHANGING OLD RUBBER BANDS May 96 column wrote piece titled Wing Away aircraft transformed itself air-to-ground missile four-year-old older rubber bands main wing suddenly lost elasticityouch post mortem revealed slim pickings Having read story formulated few thoughts own regarding life rubber band longtime engineer modeler Tom Cater Grand Rapids Michigan thought rest us might benefit little some personal observations has personal observation engineer user rubber bands hobby 40 years life rubber band determined foremost amount sunlight falls have observed rubber bands going new breakage after just hours exposure maximum sunlight have always used rubber bands until worn out dismay other fliers have never lost wing flying conditions ranging 900 Fahrenheit l0O Fahrenheit determine rubber band worn out examination cracks deterioration try replace half rubber bands replacement indicated way half rubber bands new untested other half used previously proven flightworthy list factors affecting rubber band life Exposure sunlights ultraviolet light Composition rubber Storage conditions both new used Exposure raw unburned fuel Exposure hot engine gasses Exposure sunlights ultraviolet light experience seems deteriorating factor rubber bands amount ultraviolet light strikes earth given time varies seasons atmospheric conditions Therefore deterioration rate can very different two different days year clear summer days deterioration rate its maximum often length time airplane field combines compound danger broken rubber bands such days often cover airplanes rubber bands rag its flying Under conditions deterioration its greatestpreflight inspection rubber bands advisable Composition rubber have seen some rubber bands turn liquefied substance exposed certain plastics Model fuel dissolves some rubber bands rather quickly wise move buy rubber bands hobby supplier pay product hopefully tested sport buy bargain rubber bands office supply store test airplane Storage conditions both new used As chemically produced products storage above room temperature will reduce shelf life Storing new rubber bands light-tight air tight container room temperature will maximize life good new ones should last 10 years stored way Used rubber bands seem very adversely affected burnt fuel residue oil have found blotting rag good anything ones did fall flew few times winter still flyable spring long spring sun Never leave new rubber bands out sun field Exposure raw unburned fuel Raw fuel nitromethane hard rubber bands well aircraft finishes Contact between two should avoided Exposure hot engine gasses Hot engine-exhaust gasses can heat rubber bands As become heated lose elasticity become softer until become hot melt engines muffler exhaust should flow over rubber bands Check before mounting engine Cold has experience rubber bands will work much colder temperatures pilot will cold temperatures rubber bands will become stiff advisable put warm avoid unnecessary stress both rubber band aircraft Having read Toms comments compared own experiences would have agreehis observations right mark although would like add extra emphasis obtaining quality rubber bands quality rubber bands always seems vary greatly ones purchase hobby shop sure stretch few before buy Check random sample cracks yellowing before purchase make sure store aware problems next modeler wont end up Again Tom mentioned Id recommend purchase use bands hobby shop Once bands use airplane personal policy changing doubtthrow out Theyre just too cheap worry about results potentially disastrous dont have knowledge desire care like Tom does stop consider much rubber band costs compared cost replacing airplane reasonable person would have agree risk using over over again doesnt make good sense simple analogy involves comparing much costs put gas car month cost motor oil same period Which fluid costs less use per mile answer oil Which will damage engine isnt maintained proper manner answer oil Which itemfuel rubber bandsis less expensive per flight has greatest potential damage goes bad Remember can always glide model down engine quits So comparing damage potential rubber bands motor oil think its wise push margins safety either dont Avoid some grief discard rubber bands end day Sticker Requirements reading through AMA National Newsletter recently ran across piece should interest us since relates improved radio technologies As written Bob Underwood As 1 January 1995 so-called sticker requirement dropped AMA Safety Code Since March 1 1992 manufacturers have required meet narrow-band transmitter specifications given until March 1 1993 clear existing October 1996 37 50 3050 4661 4965 6074 Sisso6090 3/0s286110 1/2523011042143 1/32 x 336 43 50 60 1/20 x 336 43 50 60 1/16 s 336 44 50 60 3/325343 52 61 67 1/85352 63 73 04 3/165362 76 64 101 1/4s376 04113136 5/16x3199152 3/Ox 3105115140170 1/2s3135150175205 3/4x3225310 1/32s456667992 1/20s456607992 1/16s456607992 3/32s46002106114 1/0s47693112134 3/16x467109140150 1/4x4196152162179 5/16x4102234 3/Ox 4165210239265 1/2s4249205315336 3/4x4350471 MATCHED SHEETS 42 48 3/32x4125142 1/0x4150169 3/16s4104109 1/454176205 BIRCH DOWELS36 1/616 3/1617 1/420 5/1627 3/037 1/254 5/674 AILERONS3648 1/4515762 1/4s1-1/46590 1/4x1-1/274105 1/4s200115 5/16s1-1/474105 5/16x1-1/275106 5/16x266120 3/Osl-1/460115 3/6x1-1/263116 3/Ox 295135 1/2x1-1/295140 1/252106150 1/4x275 1/4s3109 3/0x290 3/6x3131 1/253154 ADO FOR SHAPES LEA 0/05 OBOE 2530 SPRUCE TRIANGLES 36 3/6x3/654 1/2o1/275 T/4s5/496 1/lOx 1/2 3/32 SQ 3/32s 1/4 3/3253/0 3/32x1/2 1/8 SQ 1/0x3/16 1/051/4 1/Ox 3/6 1/Ox 1/2 1/653/4 1/651 3/16 SQ 3/165 1/4 3/1653/6 3/lOx 1/2 3/1653/4 3/1651 1/4 SQ 1/453/0 1/451/2 1/453/4 1/45 1 5/16 50 3/6 SQ 3/851/2 3/653/4 3/051 1/2 SQ 1/253/4 1/251 5/6 SQ 3/4 SQ 3/451 BUNDLE DEALS 20 1/16o3 203/32s3 151/6 53 153/1653 101/453 103/653 51/2 53 20 1/165 4 10 1/lOx 4 153/32s4 103/32 54 101/0 54 51/054 103/1654 53/1654 101/454 51/4x4 53/0x4 51/2o4 TRIANGLES 1/4 3/6 1/2 3/4 1-1/2 10 10 12 13 17 11 14 15 19 11 13 14 15 21 20 35 14 16 21 24 30 30 22 27 29 42 52 27 36 40 53 67 49 60 70 00 01 90 36 799 970 075 1050 075 1050 695 1235 1150 075 1000 1400 950 1300 21 23 27 36 45 23 27 20 36 45 59 30 33 41 50 70 35 45 57 60 06 64 02 104 06 111 132 48 900 1075 625 735 035 36 29 33 40 54 60 131 225 48 119 s119 1 70119 93144 114175 s3132292 1/4 53157237 3/653160307I. 1/2s3230302 3/45 3375519 153532719 1/32x4123160co 1/2054123160c 1/1654123160 3/3254149232 1/0s41692162 3/1654197360.. 1/4542373321 3/0s431575163 1/2s4402600 4-6/5 wssOSs5/5crl5axila5Oity/ SUPERIOR LITE1224 48 1/Ox 6250395 1/8s12395750 1/4512495950 LITE PLY1224 48 1/0 sO100125 235 1/Os 12125235 450 1/45 6125175 340 1/45 12175345 650 3 PLY BIRCH 122448 1/64x6140275495 1/64512279510959 1/32 sO 95160325 1/32o12100335635 1/1056 95100325 1/lOs 12160335625 1/OxO 95100335 1/Os 12180335650 4 PLY BIRCH 122448 3/16 sO 100215345 3/16o12 215 345 665 S PLY BIRCH 122448 3/3256135260490 3/32512260500695 1/056145200525 1/Os 12260550950 1/4x0125250300 1/4s12230300725 7 PLY BIRCH 122448 3/OxO 150 265 525 3/Os 12 2655501060 8 PLY BIRCH 122448 1/2s0200350 575 1/2x 123505001125 HARD MAPLE18 1/4x1/445 1/4o3/050 1/4o1/256 3/0o3/050 3/Oxl/256 3/Os 3/4 65 3/65175 3/Osl-1/2115 1/2s1/275 70 5/6o3/4 05 3/4s3/4 92 SPRUCE/ BASS3648 60" 1/16x1/42430 3/32x 1/42539 1/0 SQ2129 1/Ool/4-l2036 1/0o3/O3546 1/Ool/24155 1/0o3/44763 3/10502030 3/1653/04053 3/16x1/2LU4604 3/1653/4A6506 1/4 SQ4557100 1/453/05309 1/451/20101130 1/453/403110100 3/6 SQ6405130 3/051/27591154 1/2 SQ05105100 1/253/494125 200 ADD $550 EXTRA FOR PACKACINO GROOVED LG MOUNTS 3/053/41/050 3/053/45/3250 1/2s3/43/1O55 WING SKINS3B36 1/32512479 535 1/29512479 535 1/lOs 12470 535 3/32x12579 645 TRAILING EDGES36 1/Osl/229 3/1653/435 1/45139 5/1651-1/450 3/651-1/2 56 1/2x2 00 EPOXY 4-1/2 02 9 02 5 Minute425669 15 Minute425669 30 Minute425669 2 Hour425669 20 Minute429040 INSTANT GLUE 1/2 orGE105 1 sz Thin GF300 2sz Thin GF550 Ooz Thin GF1650 1/2 oz Extra Thick200 1 oz Extra thick330 2 os Extra Thick600 O sz Extra thick1800 ODORLESS FOR FOAM 1/2 oz Thin GE425 1 ox Thin GE705 2os Thin GE1305 2oz Accelerator315 Osz Acc Retill695 Exttips6149 Ext tips o tine 6149 INFO & HELP 806-745-6394 ORDERS ONL 1-800-687-5555 24 HR FAX 806-745-6483 Cool 40 State Hanoting Charge $650 pay UPS Add $550 CQDISEND MAIL LONE STAR MODELS $800 extra P6 APO FPO accept Vsa MC Qscooer personal checks Ion COD 6/s % lax n Texas US currency Mn wood order $rsod ORDERS TO Rt9 Box 437 Lubbock IX 79423 stock Therefore Eransmitter produced after March 1 1992 purchased after March 1 1993 may considered narrow band Contest directors may wish consult pages 13-15 Membership Manual guidance concerning transmitters receivers Rule 412 page 13 recommends Contest Directors club officers require tests implement special frequency control arrangements may necessary reduce probability harmful interference among RC systems Within document will find empirical tests both transmitters receivers Additionally AMA equipment available through AMA district Frequency Coordinator Vice President will aid frequency management should noted primary problems inherent use older wide-band equipment center around receivers Since FCC does require type acceptance receivers complicated laboratory test necessary determine wether meet narrowband specifications course left date manufacture empirical test found page 14 Membership Manual bill sale indicating unit purchased after March 1 1993 may also helpful guide Finally Contest Directors will find good portion equipment being used will still carry gold RCMA sticker Some AMA members continuing have equipment tested both manufacturers independent sticker stations key Contest Directors however AMA Safety Code no longer contains goldsticker requirement next important date consideration March 1 1998 time older wide-band transmitters will become illegal FCC regulation Thats monththanks mail hope have having great flying season Isnt time start thinking about what Santa should bring Christmas IN CONTROL Z7 Losing control can nightmare wrong response given command can take its toll model nerves wallet Radio South know feel about hobby too avid RC enthusiasts nearly half century combined experience modeling radio repair So avoid inflated repair costs undue service time Radio South fast economical in-house radio service can depend Radio South customer satisfaction isnt just motto Its way life Let us put back control FB ne JAIRTRONIOS 3702 N Pace Pensacola FL 32505 repair information 904 434-0909 1-800-962-7802 Toll Free Order Line lOrders Only Pleasell 38 Model Aviation