Three very effective nigh-quality bounamaster mufflers available Davis Diesel Development text has address left Model SM-I 40 61 size center larger SM-i 50 75 size right smaller SM-li 25 45 size mufflers substantially reduce sound levels will also increase engine rpm over what obtainable stock mufflers OBJECTIVE purpose article present three simple practical effec tive steps average RC sport flier can take reduce noise level model aircraft steps 1 buying making effective muffler 2 reprop ping engine 3 readjusting some flying methods following procedures will effect sound processing models rewards considerable will jus tit efforts wit will 1 find flying pleasurable lower sound levels 2 surprised mini mal effects upon actual flying quieter aircraft 3 gain satis faction taking positive constructive action assure future great hobby/sport ideas offered result ex perimenting working readily avail able products materials utilize construction techniques feasible modelers workshops Since believe reinventing wheel have re viewed wealth noise articles ideas appearing during past several years model aircraft publications cluding Model Aviation Radio Control Modeler RC Report am basing ef forts research experiments prod ucts offered number individuals companies including Gordon Banks RC research goes find better ways lessen sound models make present following practical information simple solutions can put practice now EGiI Weiss About Thoughts lowering gine noise en 40 Model Aviation Report Bob Davis Davis Diesel Develop ment Duke Fox Fox Engines John Hun ton K&B Manufacturing Don Lowe AMA President United Model Products Jim VanSant Bucks County RC Club others have contributed sound reduction efforts Background time clearly evi dent number reason losing flying sites across country noise European countries noise standards have imposed years now modelers have faced serious challenge lower sound levels compli ance United States real estate de velopment population expansion contin ues increasing rate modelers have recently begun realize impor tance reducing sound levels terest keeping flying fields Hand-in-hand cultivating positive public image modeling environmental considerations demand atten tion ever before Incidentally safety self-regulation next two im portant considerations acquiring keeping flying sites things made very evident clubs efforts acquire field southeastern Pennsylvania during past few years Refer article Profes sional Approach Finding Keeping Flying Field January 1988 Model Avia tion As involved modeler active flier three local clubs recently sociate vice-president AMA talk lots fellow modelers RC fliers locations became obvious noise must reduced obtain keep flying sites basic con tinued pursuit hobby club am currently presidentIMAA Chapter 168 Levittown Aerobugs Incnow finds its new field jeopardy cause nearby home construction hope keeping fine flying site through immediate noise reduction sound processing aircraft Initially because didnt really know spe cifically approach noise pro blem what about felt de pressed Although have built flown types RC aircraft Gliders Electrics four-stroke-powered models prefer two-cycle engines 25 60 displacement range Im alone popular engines chief noise cul prits article targeted being give up easily re searched information could find reducing noise lowering sound levels began experimenting various prod ucts methods learned can lower sound levels using simple expensive procedures makes both pleased positive about aeromodeling future great need part aeromodeling fraternity learn about adopt sound-reducing techniques motivated write article Others both locally elsewhere country have made similar efforts presented have likewise yielded positive re sults What Need Step No 1 Use effective muffler single-chamber expansion mufflers come current production engines just dont job require must better cool control expanding exhaust ga ses using technology both automo tive mufflers gun silencers muf flers need multiple expansion pipes small holes surrounded sound-absorbing materials cut down high-frequency noise greater annoyance Ex perimenting different silencer configu rations models specific design can help determine arrangement achieves optimal sound reduction least hinder ing performance final very important point bigger better mufflers con cerned Since intended article rather theoretical Ill limit myself following comments point must make some per sonal decisions relative time money effort simplest effective muf September 1988 41 no cneap effective beverage can after-muffler installed Midwest Bipe-stik Mount ing problems obvious lack aesthetics tend make unpopular setup though neat highly effective installation consists K&B 45 Sportster muffler mounted Enya 25 piece original Enya muffler modified make adapter fler install pride joy opinion Soundmaster available Davis Diesel Development Co Milford CT 1-203-877-1670 Notice didnt say least expensive considering quality ease installation imported mufflers value very good Several different sizes configurations offered including silenced tuned pipes four-stroke models type flying aircraft used determines model youll need Remember bigger better Simple adapters configure muf fler different engines photos shows mufflers stalled three models Tubing may also attached end mufflers further reduce sound redirect exhaust residue Bear mind using such muf flers actually increases engine performance up few hundred rpm Soundmaster muffler utilizes several internal baf fles conjunction exhaust pipe filled tiny holes gases enter offcenter design sets up swirling ef fect seems tune muffler increased performance diametrically opposite approach cost standpoint make use aftermuffler provides additional ex haust gas cooling acts second expan sion chamber may use either poly propylene 8- l0-oz fuel tank really cheap empty beverage can opted can seems cool things down bet ter simply enlarged pop-top opening installed 3-in piece silicone tuned pipe connector tubing using hightemperature RTV silicone sealer red color sealant readily available automotive stores has uses types muffler work make eight %-in holes rear can fuel tank clamp onto end engines regular muffler somewhat large unsightly poses some interesting mounting problemsbut does work simple aluminum clamp screwed plywood plate fuselage helps keep aftermuffler place Falling between above two extremes lies Land Ingenuity few bucks expense some time effort can have fun satisfac tion engineering building own muffler Being tinkerer gets much sat isfaction building things suit needs out existing products materi als Im element first highly successful venture adapting K&B Sportster 45 muffler ordered through local hobby shop Enya Schnuerle 25 engine cut off adapter end stock Enya muf fler fit between exhaust port K&B muffler About hour file drill gave professional-looking job put engines sound level 86 dBA 9 ftless half AMA sound guideline combination can seen photos sons trusty Eaglet 50 flies effortlessly half thrQttle now quiet can hardly hear write K&B identify en gine understand will custom make adapter excellent mufflers mufflers incidentally built baffles similar automotive ones K&Bs sporster series engines leading way application re duced sound techniques Other manufactur ers likely follow suit During past months have col lecting sort junk box potential muffler-making materials ex periment trip hobby shop building supply/hardware store etc look goodies Some best finds have trash cans home dis carded piles materials work Brass tub ing various diameters coarse steel wool scraps pipe variety aerosol cans have provided materials best efforts successes larger muffler photos fits Enya 40-and 45size engines light easy mount highly effective Utilizing stock muffler initial low-frequency noise expan sion chamber adapted empty alumi num can contained hair mousse product second chamber ab sorb high-frequency noise An s tube drilled lots tiny A6-in holes goes through entire length muf fler small setscrew holds place stock muffler tail pipe silicone sealer applied pipe exits rear can also latter force fit ted onto stock muffler Prior final sembly inside mousse can loosely packed coarse steel wool muffler based both automotive gun silencer technology requires no brazing other special construction techniques Its design offshoot article January 1985 RCM similar efforts other local fliers except simplified construction lightened en hanced its looks using readily avail able mousse can original paint sanded off go route make sure can empty before carefully wiggle off top pliers Depending stock muf fler use cut rolled metal rim off top can use Y4 -in dowel swag opening required size rolling can hard surface hand putting pressure dowel turning down enlarging opening other hand Another mufflers made stock STM sold United Model Prod ucts through hobby shops used brass tube insert lots holes steel wool packing installing model 25size engine limited imagination once get involved design ing building own mufflers universal adapters commercial prod42 Model Aviation Assorted parts reiated JunK author uses fabricate mufflers Enys muf fler mousse can brass tube center picture parts used make muffler pictured below black hoses Du-Bro exhaust extension available hobby shops best results particular engine use Imagination experiment authors homemade mousse muffler lowered engine noise impressive 12 dbA 500 rpm drop engine speed caused no problems Great Planes Sportster 40 flies lower muffler STM 3141 modified adding brass pipe packing coarse steel wool sheet brass reduction plate adapts 40size muffler use 25 Remember bigger better comes mufflers ucts can further modified smaller en gines using thin brass stock smaller openings cut placed between muffler adapter plate exhaust port engine K&S brass products available hobby shops excel lent source materials last note mufflers tuned pipe advocatesuse silenced tuned pipes have internal baffles cannot see light through pipes de signed Pattern planes using long-stroke engines high-pitched props Speaking props ready move Step No 2 Reprop aircraft Next engine exhaust propeller second largest source noise Keep mind sound additive source part total sound output Realizing much dont know about prop noise AMA re cently undertook research project topic collaboration North Carolina State University Since need act now lets put use what knowledge already have today main objective keep down tip velocity propellers using higherpitch smaller-diameter props will help achieve us have increased prop diameters order decrease rpm course also quiets things down engine running hard ex haust gas pressure lessened However drawback larger props tips travel greater distance increa ses speedand thats definitely no good regard quieting things down productive steps take increase usual propeller pitch least inch example nor mally use 10 x 6 40-size engine try 10 x 7 10 x 8 60 use 11 x 8 12 x 7 Some props may hard get available must go larger diameter either hold same pitch go up inch de crease pitch Contrary popular belief moderate increases pitch decreases rpm will overload engine radi cally change aircraft performance Three bladed props should also experimented Make sure carefully balance props vibration whatever source significant producer noise Some ex perimenting tachometer dB meter various props will dramatically complement other efforts reducing noise Also bear mind thin-bladed stiff props quietest round ing corners prop tips helps too Just careful try modifications could prove dangerous Try different makes different types propellers such wide-bladed four-stroke variety determine what works best Step No 3 Readjust flying thods major problems hu man beings resistance change find difficult break old habits try something new flexible better can cope change lessen frustrations enjoy ourselves Part being flexible involves ability com promise art best problem-solving tools have above mind need reor ient ourselves quest maximum noise reduction Listed below several important points act upon Always put largest size engine practical models design calls 25 40 engine use 40 40 60 aircraft use 60 cause flying half two-thirds throttle really cuts noise Overpowering model will reduce noise fly accor dingly B conjunction preceding throttle back dont need full power Did ever hear piotted aircraft roar around continuously full power use full throttle takeoff pull back after climb-out Learn use left hand break old habit con stantly flying full power Reserve takeoffs vertical maneuvers will find sound-processed model will realistic because closely approximates sound footprint its full-scale counterpart C assist keeping engine cool consistent lowering rpm use fuel 5% nitro content Continued page 134 September 1988 43 Z2ZtWincheEZ NEW SPACE SAVING CONTAINER FitsinYourBox 2Ax7%highx9% Tough Rigid Polyethylene udes Tubing eners Lock Tubing Through Cap ostage North Products PO Box 18419 Cleveland Heights OH 44118 II'I pack balanced cell shorted probably makes sense replace bad cell pair cells thats way packaged As can see pictures cells Kraft synthesizer transmitter packaged pairs replaced whole pack need transmitter Myers/Aberle tests want best contact friend Larry Sribnick SR Batteries Box 287 Bellport NY 11713 516 286-0079 SR can will supply packs connectors equipment manufactured Ace RJC Airtronics Cannon Cirrus Cox/Sanwa Futaba Kraft Tower some World Engines anything Deans con nector cant find source manufacturers connector can always use Deans Connectors Ace R/C see above contact SR help As example havent able find source Hi-Tee connec tor used Polks World Engines use Deans As cells themselves SR will suggest al ternatives like SR900s will fit place SOOs will make up packs special configu rations number cells L shapes stacked packs etc keep up-todate file original transmitter battery pack con figurations can make up literally pack need Though dont like doing SR will re place individual cells pack chafg ing $2 over cost materials giving pack full five-day test sequence insure worthy continued use Some manufacturers make battery pack replace ment simple plug-in matter Airtronlcs others make take apart transmitter af fair case Kraft faced latter situation least bit hesitant about making change turn prob lem over serviceman Check warranty first Im still vacation Happy flying Noise/Weiss Continued page 43 D Always build maintain air craft ensure minimum vibration levels Sounds vibrating pushrods loose fit tings loose coverings less-than-solid airframes contribute noise lot room research experimenta tion engine-mounting techniques related structural considerations E Last least some minor per formance compromises will sometimes necessary keep flying sites will ing accept open mind Once get familiar terms quieter aircraft will actually enjoy results effort Conclusions todays world us have no choice sound process model aircraft Much research work experimentation remain done little know right now can go long way toward reducing noise keeping flying fields hope manufacturers will get involved future since too have lot stake technology us today success depends applying specific problems Future research experimentation may provide bet ter methods meet lower sound objec tives have gratified other fliers club geographic area have shown greater awareness need fly quietlyand increasing interest involvement achieving goal breaking old habits developing new ones may find enjoy hobby past will really appreciate quieter models flight line Ive shared above information order fill needa need ef fective simple starting point embark upon sound proces sing approach quiet flight predict will new information new prod ucts appearing increasing rate meantime invest some time effort have fun above keep em flying RC AerobaticsNan Putte Continued page 45 Hed also like read about what expect bending moment center wing Obvi ously both topics tied together Ill work soon can Any other ideas RC Slope Soaring/Triebes Continued page 47 art system indispensable some competitive thermal flying and/or F3B As investing much money system really get what pay have inten tions continuing sport years come will undoubtedly run need such capabilities future true other things might well get best possible radio system can afford recently received letter Pierre Dume nil expressed very interesting idea malting videotape Slope Soaring finlshed will available clubs area would like get people involved Slope Soaring tape will great way show just what facet Soaring about Most people reluctant get involved something havent seen great way get Slope Soaring expo sure deserves talk Pierre sounds video going very highquality production shows aspects Slope Soaring youd like get copy videotape should available very soon just let know will pass word Pierre would like mention again will International Slope Race F3F Denmark sometime 1989 Anyone interested going either spectator competitor should get touch soon possible looks like will truly incredible event have urge go would highly rec ommend would really like thank whove sent letters and/or called response writings Slope Soaring response has greater ever imagined love help will able bring Slope Soaring forefront RC Soaring So keep letters photos calls coming 134 Model Aviation LiqIii LINE SYSTEMS P0 Box 1502 Lewiston 04241 FOAM CORE FLOATS PLANS AND KITS WE OFFER SELECTION OF FLOAT PLANS AND KITS FOR 4 12 POUND AIRPLANES WITH Y HULL ESIGN IN USE SINCE 1972 SEND SASE FOR CATALOG SHEET KIRCHER R/C PRODUCTS [NC 9 SHEFFIELD WAY CLARK NJ 07066 i A WE BUILD YOUR HELl TEST YOUR HELl PAIR YOUR HELl 322 North 7th St 64$ V11 Lehighton Pa 18235 WRITE OR CALL FOR INFORMA TION WOAL55 SOO5ST SCALP PHOtO SESVCP 500 PHOTO PACKS PLANS 3 VIEWS PHOTO-PACKS PLANS ENLARGING S*SE EnISr5O5 COPS lip Pepin&s Catalog $oo 60 pagesSCALE PlANS Eli PHOTO SERVICE 3209 Madsoo GeensOooo N C 27403 Phoop lnIal2a25239 INs ColleCt 77T L4TNES MILS lIETALS B00S PRECISI0N ISJSTR.MENTS - - CClIPFTE CAI$00 $200 IOn 8 SeIonR2 Sprngfo12 O8~ 43505 mpa 513 3220562 PAWU DIESELS Englands Finest 049 35 RIC STD Send $100 list Eric Clutton 913 Cedar Lane Tullahoma Tenn 37388 Send SSAE tsr catalog sheet complete line
Edition: Model Aviation - 1988/09
Page Numbers: 40, 41, 42, 43, 134
Three very effective nigh-quality bounamaster mufflers available Davis Diesel Development text has address left Model SM-I 40 61 size center larger SM-i 50 75 size right smaller SM-li 25 45 size mufflers substantially reduce sound levels will also increase engine rpm over what obtainable stock mufflers OBJECTIVE purpose article present three simple practical effec tive steps average RC sport flier can take reduce noise level model aircraft steps 1 buying making effective muffler 2 reprop ping engine 3 readjusting some flying methods following procedures will effect sound processing models rewards considerable will jus tit efforts wit will 1 find flying pleasurable lower sound levels 2 surprised mini mal effects upon actual flying quieter aircraft 3 gain satis faction taking positive constructive action assure future great hobby/sport ideas offered result ex perimenting working readily avail able products materials utilize construction techniques feasible modelers workshops Since believe reinventing wheel have re viewed wealth noise articles ideas appearing during past several years model aircraft publications cluding Model Aviation Radio Control Modeler RC Report am basing ef forts research experiments prod ucts offered number individuals companies including Gordon Banks RC research goes find better ways lessen sound models make present following practical information simple solutions can put practice now EGiI Weiss About Thoughts lowering gine noise en 40 Model Aviation Report Bob Davis Davis Diesel Develop ment Duke Fox Fox Engines John Hun ton K&B Manufacturing Don Lowe AMA President United Model Products Jim VanSant Bucks County RC Club others have contributed sound reduction efforts Background time clearly evi dent number reason losing flying sites across country noise European countries noise standards have imposed years now modelers have faced serious challenge lower sound levels compli ance United States real estate de velopment population expansion contin ues increasing rate modelers have recently begun realize impor tance reducing sound levels terest keeping flying fields Hand-in-hand cultivating positive public image modeling environmental considerations demand atten tion ever before Incidentally safety self-regulation next two im portant considerations acquiring keeping flying sites things made very evident clubs efforts acquire field southeastern Pennsylvania during past few years Refer article Profes sional Approach Finding Keeping Flying Field January 1988 Model Avia tion As involved modeler active flier three local clubs recently sociate vice-president AMA talk lots fellow modelers RC fliers locations became obvious noise must reduced obtain keep flying sites basic con tinued pursuit hobby club am currently presidentIMAA Chapter 168 Levittown Aerobugs Incnow finds its new field jeopardy cause nearby home construction hope keeping fine flying site through immediate noise reduction sound processing aircraft Initially because didnt really know spe cifically approach noise pro blem what about felt de pressed Although have built flown types RC aircraft Gliders Electrics four-stroke-powered models prefer two-cycle engines 25 60 displacement range Im alone popular engines chief noise cul prits article targeted being give up easily re searched information could find reducing noise lowering sound levels began experimenting various prod ucts methods learned can lower sound levels using simple expensive procedures makes both pleased positive about aeromodeling future great need part aeromodeling fraternity learn about adopt sound-reducing techniques motivated write article Others both locally elsewhere country have made similar efforts presented have likewise yielded positive re sults What Need Step No 1 Use effective muffler single-chamber expansion mufflers come current production engines just dont job require must better cool control expanding exhaust ga ses using technology both automo tive mufflers gun silencers muf flers need multiple expansion pipes small holes surrounded sound-absorbing materials cut down high-frequency noise greater annoyance Ex perimenting different silencer configu rations models specific design can help determine arrangement achieves optimal sound reduction least hinder ing performance final very important point bigger better mufflers con cerned Since intended article rather theoretical Ill limit myself following comments point must make some per sonal decisions relative time money effort simplest effective muf September 1988 41 no cneap effective beverage can after-muffler installed Midwest Bipe-stik Mount ing problems obvious lack aesthetics tend make unpopular setup though neat highly effective installation consists K&B 45 Sportster muffler mounted Enya 25 piece original Enya muffler modified make adapter fler install pride joy opinion Soundmaster available Davis Diesel Development Co Milford CT 1-203-877-1670 Notice didnt say least expensive considering quality ease installation imported mufflers value very good Several different sizes configurations offered including silenced tuned pipes four-stroke models type flying aircraft used determines model youll need Remember bigger better Simple adapters configure muf fler different engines photos shows mufflers stalled three models Tubing may also attached end mufflers further reduce sound redirect exhaust residue Bear mind using such muf flers actually increases engine performance up few hundred rpm Soundmaster muffler utilizes several internal baf fles conjunction exhaust pipe filled tiny holes gases enter offcenter design sets up swirling ef fect seems tune muffler increased performance diametrically opposite approach cost standpoint make use aftermuffler provides additional ex haust gas cooling acts second expan sion chamber may use either poly propylene 8- l0-oz fuel tank really cheap empty beverage can opted can seems cool things down bet ter simply enlarged pop-top opening installed 3-in piece silicone tuned pipe connector tubing using hightemperature RTV silicone sealer red color sealant readily available automotive stores has uses types muffler work make eight %-in holes rear can fuel tank clamp onto end engines regular muffler somewhat large unsightly poses some interesting mounting problemsbut does work simple aluminum clamp screwed plywood plate fuselage helps keep aftermuffler place Falling between above two extremes lies Land Ingenuity few bucks expense some time effort can have fun satisfac tion engineering building own muffler Being tinkerer gets much sat isfaction building things suit needs out existing products materi als Im element first highly successful venture adapting K&B Sportster 45 muffler ordered through local hobby shop Enya Schnuerle 25 engine cut off adapter end stock Enya muf fler fit between exhaust port K&B muffler About hour file drill gave professional-looking job put engines sound level 86 dBA 9 ftless half AMA sound guideline combination can seen photos sons trusty Eaglet 50 flies effortlessly half thrQttle now quiet can hardly hear write K&B identify en gine understand will custom make adapter excellent mufflers mufflers incidentally built baffles similar automotive ones K&Bs sporster series engines leading way application re duced sound techniques Other manufactur ers likely follow suit During past months have col lecting sort junk box potential muffler-making materials ex periment trip hobby shop building supply/hardware store etc look goodies Some best finds have trash cans home dis carded piles materials work Brass tub ing various diameters coarse steel wool scraps pipe variety aerosol cans have provided materials best efforts successes larger muffler photos fits Enya 40-and 45size engines light easy mount highly effective Utilizing stock muffler initial low-frequency noise expan sion chamber adapted empty alumi num can contained hair mousse product second chamber ab sorb high-frequency noise An s tube drilled lots tiny A6-in holes goes through entire length muf fler small setscrew holds place stock muffler tail pipe silicone sealer applied pipe exits rear can also latter force fit ted onto stock muffler Prior final sembly inside mousse can loosely packed coarse steel wool muffler based both automotive gun silencer technology requires no brazing other special construction techniques Its design offshoot article January 1985 RCM similar efforts other local fliers except simplified construction lightened en hanced its looks using readily avail able mousse can original paint sanded off go route make sure can empty before carefully wiggle off top pliers Depending stock muf fler use cut rolled metal rim off top can use Y4 -in dowel swag opening required size rolling can hard surface hand putting pressure dowel turning down enlarging opening other hand Another mufflers made stock STM sold United Model Prod ucts through hobby shops used brass tube insert lots holes steel wool packing installing model 25size engine limited imagination once get involved design ing building own mufflers universal adapters commercial prod42 Model Aviation Assorted parts reiated JunK author uses fabricate mufflers Enys muf fler mousse can brass tube center picture parts used make muffler pictured below black hoses Du-Bro exhaust extension available hobby shops best results particular engine use Imagination experiment authors homemade mousse muffler lowered engine noise impressive 12 dbA 500 rpm drop engine speed caused no problems Great Planes Sportster 40 flies lower muffler STM 3141 modified adding brass pipe packing coarse steel wool sheet brass reduction plate adapts 40size muffler use 25 Remember bigger better comes mufflers ucts can further modified smaller en gines using thin brass stock smaller openings cut placed between muffler adapter plate exhaust port engine K&S brass products available hobby shops excel lent source materials last note mufflers tuned pipe advocatesuse silenced tuned pipes have internal baffles cannot see light through pipes de signed Pattern planes using long-stroke engines high-pitched props Speaking props ready move Step No 2 Reprop aircraft Next engine exhaust propeller second largest source noise Keep mind sound additive source part total sound output Realizing much dont know about prop noise AMA re cently undertook research project topic collaboration North Carolina State University Since need act now lets put use what knowledge already have today main objective keep down tip velocity propellers using higherpitch smaller-diameter props will help achieve us have increased prop diameters order decrease rpm course also quiets things down engine running hard ex haust gas pressure lessened However drawback larger props tips travel greater distance increa ses speedand thats definitely no good regard quieting things down productive steps take increase usual propeller pitch least inch example nor mally use 10 x 6 40-size engine try 10 x 7 10 x 8 60 use 11 x 8 12 x 7 Some props may hard get available must go larger diameter either hold same pitch go up inch de crease pitch Contrary popular belief moderate increases pitch decreases rpm will overload engine radi cally change aircraft performance Three bladed props should also experimented Make sure carefully balance props vibration whatever source significant producer noise Some ex perimenting tachometer dB meter various props will dramatically complement other efforts reducing noise Also bear mind thin-bladed stiff props quietest round ing corners prop tips helps too Just careful try modifications could prove dangerous Try different makes different types propellers such wide-bladed four-stroke variety determine what works best Step No 3 Readjust flying thods major problems hu man beings resistance change find difficult break old habits try something new flexible better can cope change lessen frustrations enjoy ourselves Part being flexible involves ability com promise art best problem-solving tools have above mind need reor ient ourselves quest maximum noise reduction Listed below several important points act upon Always put largest size engine practical models design calls 25 40 engine use 40 40 60 aircraft use 60 cause flying half two-thirds throttle really cuts noise Overpowering model will reduce noise fly accor dingly B conjunction preceding throttle back dont need full power Did ever hear piotted aircraft roar around continuously full power use full throttle takeoff pull back after climb-out Learn use left hand break old habit con stantly flying full power Reserve takeoffs vertical maneuvers will find sound-processed model will realistic because closely approximates sound footprint its full-scale counterpart C assist keeping engine cool consistent lowering rpm use fuel 5% nitro content Continued page 134 September 1988 43 Z2ZtWincheEZ NEW SPACE SAVING CONTAINER FitsinYourBox 2Ax7%highx9% Tough Rigid Polyethylene udes Tubing eners Lock Tubing Through Cap ostage North Products PO Box 18419 Cleveland Heights OH 44118 II'I pack balanced cell shorted probably makes sense replace bad cell pair cells thats way packaged As can see pictures cells Kraft synthesizer transmitter packaged pairs replaced whole pack need transmitter Myers/Aberle tests want best contact friend Larry Sribnick SR Batteries Box 287 Bellport NY 11713 516 286-0079 SR can will supply packs connectors equipment manufactured Ace RJC Airtronics Cannon Cirrus Cox/Sanwa Futaba Kraft Tower some World Engines anything Deans con nector cant find source manufacturers connector can always use Deans Connectors Ace R/C see above contact SR help As example havent able find source Hi-Tee connec tor used Polks World Engines use Deans As cells themselves SR will suggest al ternatives like SR900s will fit place SOOs will make up packs special configu rations number cells L shapes stacked packs etc keep up-todate file original transmitter battery pack con figurations can make up literally pack need Though dont like doing SR will re place individual cells pack chafg ing $2 over cost materials giving pack full five-day test sequence insure worthy continued use Some manufacturers make battery pack replace ment simple plug-in matter Airtronlcs others make take apart transmitter af fair case Kraft faced latter situation least bit hesitant about making change turn prob lem over serviceman Check warranty first Im still vacation Happy flying Noise/Weiss Continued page 43 D Always build maintain air craft ensure minimum vibration levels Sounds vibrating pushrods loose fit tings loose coverings less-than-solid airframes contribute noise lot room research experimenta tion engine-mounting techniques related structural considerations E Last least some minor per formance compromises will sometimes necessary keep flying sites will ing accept open mind Once get familiar terms quieter aircraft will actually enjoy results effort Conclusions todays world us have no choice sound process model aircraft Much research work experimentation remain done little know right now can go long way toward reducing noise keeping flying fields hope manufacturers will get involved future since too have lot stake technology us today success depends applying specific problems Future research experimentation may provide bet ter methods meet lower sound objec tives have gratified other fliers club geographic area have shown greater awareness need fly quietlyand increasing interest involvement achieving goal breaking old habits developing new ones may find enjoy hobby past will really appreciate quieter models flight line Ive shared above information order fill needa need ef fective simple starting point embark upon sound proces sing approach quiet flight predict will new information new prod ucts appearing increasing rate meantime invest some time effort have fun above keep em flying RC AerobaticsNan Putte Continued page 45 Hed also like read about what expect bending moment center wing Obvi ously both topics tied together Ill work soon can Any other ideas RC Slope Soaring/Triebes Continued page 47 art system indispensable some competitive thermal flying and/or F3B As investing much money system really get what pay have inten tions continuing sport years come will undoubtedly run need such capabilities future true other things might well get best possible radio system can afford recently received letter Pierre Dume nil expressed very interesting idea malting videotape Slope Soaring finlshed will available clubs area would like get people involved Slope Soaring tape will great way show just what facet Soaring about Most people reluctant get involved something havent seen great way get Slope Soaring expo sure deserves talk Pierre sounds video going very highquality production shows aspects Slope Soaring youd like get copy videotape should available very soon just let know will pass word Pierre would like mention again will International Slope Race F3F Denmark sometime 1989 Anyone interested going either spectator competitor should get touch soon possible looks like will truly incredible event have urge go would highly rec ommend would really like thank whove sent letters and/or called response writings Slope Soaring response has greater ever imagined love help will able bring Slope Soaring forefront RC Soaring So keep letters photos calls coming 134 Model Aviation LiqIii LINE SYSTEMS P0 Box 1502 Lewiston 04241 FOAM CORE FLOATS PLANS AND KITS WE OFFER SELECTION OF FLOAT PLANS AND KITS FOR 4 12 POUND AIRPLANES WITH Y HULL ESIGN IN USE SINCE 1972 SEND SASE FOR CATALOG SHEET KIRCHER R/C PRODUCTS [NC 9 SHEFFIELD WAY CLARK NJ 07066 i A WE BUILD YOUR HELl TEST YOUR HELl PAIR YOUR HELl 322 North 7th St 64$ V11 Lehighton Pa 18235 WRITE OR CALL FOR INFORMA TION WOAL55 SOO5ST SCALP PHOtO SESVCP 500 PHOTO PACKS PLANS 3 VIEWS PHOTO-PACKS PLANS ENLARGING S*SE EnISr5O5 COPS lip Pepin&s Catalog $oo 60 pagesSCALE PlANS Eli PHOTO SERVICE 3209 Madsoo GeensOooo N C 27403 Phoop lnIal2a25239 INs ColleCt 77T L4TNES MILS lIETALS B00S PRECISI0N ISJSTR.MENTS - - CClIPFTE CAI$00 $200 IOn 8 SeIonR2 Sprngfo12 O8~ 43505 mpa 513 3220562 PAWU DIESELS Englands Finest 049 35 RIC STD Send $100 list Eric Clutton 913 Cedar Lane Tullahoma Tenn 37388 Send SSAE tsr catalog sheet complete line
Edition: Model Aviation - 1988/09
Page Numbers: 40, 41, 42, 43, 134
Three very effective nigh-quality bounamaster mufflers available Davis Diesel Development text has address left Model SM-I 40 61 size center larger SM-i 50 75 size right smaller SM-li 25 45 size mufflers substantially reduce sound levels will also increase engine rpm over what obtainable stock mufflers OBJECTIVE purpose article present three simple practical effec tive steps average RC sport flier can take reduce noise level model aircraft steps 1 buying making effective muffler 2 reprop ping engine 3 readjusting some flying methods following procedures will effect sound processing models rewards considerable will jus tit efforts wit will 1 find flying pleasurable lower sound levels 2 surprised mini mal effects upon actual flying quieter aircraft 3 gain satis faction taking positive constructive action assure future great hobby/sport ideas offered result ex perimenting working readily avail able products materials utilize construction techniques feasible modelers workshops Since believe reinventing wheel have re viewed wealth noise articles ideas appearing during past several years model aircraft publications cluding Model Aviation Radio Control Modeler RC Report am basing ef forts research experiments prod ucts offered number individuals companies including Gordon Banks RC research goes find better ways lessen sound models make present following practical information simple solutions can put practice now EGiI Weiss About Thoughts lowering gine noise en 40 Model Aviation Report Bob Davis Davis Diesel Develop ment Duke Fox Fox Engines John Hun ton K&B Manufacturing Don Lowe AMA President United Model Products Jim VanSant Bucks County RC Club others have contributed sound reduction efforts Background time clearly evi dent number reason losing flying sites across country noise European countries noise standards have imposed years now modelers have faced serious challenge lower sound levels compli ance United States real estate de velopment population expansion contin ues increasing rate modelers have recently begun realize impor tance reducing sound levels terest keeping flying fields Hand-in-hand cultivating positive public image modeling environmental considerations demand atten tion ever before Incidentally safety self-regulation next two im portant considerations acquiring keeping flying sites things made very evident clubs efforts acquire field southeastern Pennsylvania during past few years Refer article Profes sional Approach Finding Keeping Flying Field January 1988 Model Avia tion As involved modeler active flier three local clubs recently sociate vice-president AMA talk lots fellow modelers RC fliers locations became obvious noise must reduced obtain keep flying sites basic con tinued pursuit hobby club am currently presidentIMAA Chapter 168 Levittown Aerobugs Incnow finds its new field jeopardy cause nearby home construction hope keeping fine flying site through immediate noise reduction sound processing aircraft Initially because didnt really know spe cifically approach noise pro blem what about felt de pressed Although have built flown types RC aircraft Gliders Electrics four-stroke-powered models prefer two-cycle engines 25 60 displacement range Im alone popular engines chief noise cul prits article targeted being give up easily re searched information could find reducing noise lowering sound levels began experimenting various prod ucts methods learned can lower sound levels using simple expensive procedures makes both pleased positive about aeromodeling future great need part aeromodeling fraternity learn about adopt sound-reducing techniques motivated write article Others both locally elsewhere country have made similar efforts presented have likewise yielded positive re sults What Need Step No 1 Use effective muffler single-chamber expansion mufflers come current production engines just dont job require must better cool control expanding exhaust ga ses using technology both automo tive mufflers gun silencers muf flers need multiple expansion pipes small holes surrounded sound-absorbing materials cut down high-frequency noise greater annoyance Ex perimenting different silencer configu rations models specific design can help determine arrangement achieves optimal sound reduction least hinder ing performance final very important point bigger better mufflers con cerned Since intended article rather theoretical Ill limit myself following comments point must make some per sonal decisions relative time money effort simplest effective muf September 1988 41 no cneap effective beverage can after-muffler installed Midwest Bipe-stik Mount ing problems obvious lack aesthetics tend make unpopular setup though neat highly effective installation consists K&B 45 Sportster muffler mounted Enya 25 piece original Enya muffler modified make adapter fler install pride joy opinion Soundmaster available Davis Diesel Development Co Milford CT 1-203-877-1670 Notice didnt say least expensive considering quality ease installation imported mufflers value very good Several different sizes configurations offered including silenced tuned pipes four-stroke models type flying aircraft used determines model youll need Remember bigger better Simple adapters configure muf fler different engines photos shows mufflers stalled three models Tubing may also attached end mufflers further reduce sound redirect exhaust residue Bear mind using such muf flers actually increases engine performance up few hundred rpm Soundmaster muffler utilizes several internal baf fles conjunction exhaust pipe filled tiny holes gases enter offcenter design sets up swirling ef fect seems tune muffler increased performance diametrically opposite approach cost standpoint make use aftermuffler provides additional ex haust gas cooling acts second expan sion chamber may use either poly propylene 8- l0-oz fuel tank really cheap empty beverage can opted can seems cool things down bet ter simply enlarged pop-top opening installed 3-in piece silicone tuned pipe connector tubing using hightemperature RTV silicone sealer red color sealant readily available automotive stores has uses types muffler work make eight %-in holes rear can fuel tank clamp onto end engines regular muffler somewhat large unsightly poses some interesting mounting problemsbut does work simple aluminum clamp screwed plywood plate fuselage helps keep aftermuffler place Falling between above two extremes lies Land Ingenuity few bucks expense some time effort can have fun satisfac tion engineering building own muffler Being tinkerer gets much sat isfaction building things suit needs out existing products materi als Im element first highly successful venture adapting K&B Sportster 45 muffler ordered through local hobby shop Enya Schnuerle 25 engine cut off adapter end stock Enya muf fler fit between exhaust port K&B muffler About hour file drill gave professional-looking job put engines sound level 86 dBA 9 ftless half AMA sound guideline combination can seen photos sons trusty Eaglet 50 flies effortlessly half thrQttle now quiet can hardly hear write K&B identify en gine understand will custom make adapter excellent mufflers mufflers incidentally built baffles similar automotive ones K&Bs sporster series engines leading way application re duced sound techniques Other manufactur ers likely follow suit During past months have col lecting sort junk box potential muffler-making materials ex periment trip hobby shop building supply/hardware store etc look goodies Some best finds have trash cans home dis carded piles materials work Brass tub ing various diameters coarse steel wool scraps pipe variety aerosol cans have provided materials best efforts successes larger muffler photos fits Enya 40-and 45size engines light easy mount highly effective Utilizing stock muffler initial low-frequency noise expan sion chamber adapted empty alumi num can contained hair mousse product second chamber ab sorb high-frequency noise An s tube drilled lots tiny A6-in holes goes through entire length muf fler small setscrew holds place stock muffler tail pipe silicone sealer applied pipe exits rear can also latter force fit ted onto stock muffler Prior final sembly inside mousse can loosely packed coarse steel wool muffler based both automotive gun silencer technology requires no brazing other special construction techniques Its design offshoot article January 1985 RCM similar efforts other local fliers except simplified construction lightened en hanced its looks using readily avail able mousse can original paint sanded off go route make sure can empty before carefully wiggle off top pliers Depending stock muf fler use cut rolled metal rim off top can use Y4 -in dowel swag opening required size rolling can hard surface hand putting pressure dowel turning down enlarging opening other hand Another mufflers made stock STM sold United Model Prod ucts through hobby shops used brass tube insert lots holes steel wool packing installing model 25size engine limited imagination once get involved design ing building own mufflers universal adapters commercial prod42 Model Aviation Assorted parts reiated JunK author uses fabricate mufflers Enys muf fler mousse can brass tube center picture parts used make muffler pictured below black hoses Du-Bro exhaust extension available hobby shops best results particular engine use Imagination experiment authors homemade mousse muffler lowered engine noise impressive 12 dbA 500 rpm drop engine speed caused no problems Great Planes Sportster 40 flies lower muffler STM 3141 modified adding brass pipe packing coarse steel wool sheet brass reduction plate adapts 40size muffler use 25 Remember bigger better comes mufflers ucts can further modified smaller en gines using thin brass stock smaller openings cut placed between muffler adapter plate exhaust port engine K&S brass products available hobby shops excel lent source materials last note mufflers tuned pipe advocatesuse silenced tuned pipes have internal baffles cannot see light through pipes de signed Pattern planes using long-stroke engines high-pitched props Speaking props ready move Step No 2 Reprop aircraft Next engine exhaust propeller second largest source noise Keep mind sound additive source part total sound output Realizing much dont know about prop noise AMA re cently undertook research project topic collaboration North Carolina State University Since need act now lets put use what knowledge already have today main objective keep down tip velocity propellers using higherpitch smaller-diameter props will help achieve us have increased prop diameters order decrease rpm course also quiets things down engine running hard ex haust gas pressure lessened However drawback larger props tips travel greater distance increa ses speedand thats definitely no good regard quieting things down productive steps take increase usual propeller pitch least inch example nor mally use 10 x 6 40-size engine try 10 x 7 10 x 8 60 use 11 x 8 12 x 7 Some props may hard get available must go larger diameter either hold same pitch go up inch de crease pitch Contrary popular belief moderate increases pitch decreases rpm will overload engine radi cally change aircraft performance Three bladed props should also experimented Make sure carefully balance props vibration whatever source significant producer noise Some ex perimenting tachometer dB meter various props will dramatically complement other efforts reducing noise Also bear mind thin-bladed stiff props quietest round ing corners prop tips helps too Just careful try modifications could prove dangerous Try different makes different types propellers such wide-bladed four-stroke variety determine what works best Step No 3 Readjust flying thods major problems hu man beings resistance change find difficult break old habits try something new flexible better can cope change lessen frustrations enjoy ourselves Part being flexible involves ability com promise art best problem-solving tools have above mind need reor ient ourselves quest maximum noise reduction Listed below several important points act upon Always put largest size engine practical models design calls 25 40 engine use 40 40 60 aircraft use 60 cause flying half two-thirds throttle really cuts noise Overpowering model will reduce noise fly accor dingly B conjunction preceding throttle back dont need full power Did ever hear piotted aircraft roar around continuously full power use full throttle takeoff pull back after climb-out Learn use left hand break old habit con stantly flying full power Reserve takeoffs vertical maneuvers will find sound-processed model will realistic because closely approximates sound footprint its full-scale counterpart C assist keeping engine cool consistent lowering rpm use fuel 5% nitro content Continued page 134 September 1988 43 Z2ZtWincheEZ NEW SPACE SAVING CONTAINER FitsinYourBox 2Ax7%highx9% Tough Rigid Polyethylene udes Tubing eners Lock Tubing Through Cap ostage North Products PO Box 18419 Cleveland Heights OH 44118 II'I pack balanced cell shorted probably makes sense replace bad cell pair cells thats way packaged As can see pictures cells Kraft synthesizer transmitter packaged pairs replaced whole pack need transmitter Myers/Aberle tests want best contact friend Larry Sribnick SR Batteries Box 287 Bellport NY 11713 516 286-0079 SR can will supply packs connectors equipment manufactured Ace RJC Airtronics Cannon Cirrus Cox/Sanwa Futaba Kraft Tower some World Engines anything Deans con nector cant find source manufacturers connector can always use Deans Connectors Ace R/C see above contact SR help As example havent able find source Hi-Tee connec tor used Polks World Engines use Deans As cells themselves SR will suggest al ternatives like SR900s will fit place SOOs will make up packs special configu rations number cells L shapes stacked packs etc keep up-todate file original transmitter battery pack con figurations can make up literally pack need Though dont like doing SR will re place individual cells pack chafg ing $2 over cost materials giving pack full five-day test sequence insure worthy continued use Some manufacturers make battery pack replace ment simple plug-in matter Airtronlcs others make take apart transmitter af fair case Kraft faced latter situation least bit hesitant about making change turn prob lem over serviceman Check warranty first Im still vacation Happy flying Noise/Weiss Continued page 43 D Always build maintain air craft ensure minimum vibration levels Sounds vibrating pushrods loose fit tings loose coverings less-than-solid airframes contribute noise lot room research experimenta tion engine-mounting techniques related structural considerations E Last least some minor per formance compromises will sometimes necessary keep flying sites will ing accept open mind Once get familiar terms quieter aircraft will actually enjoy results effort Conclusions todays world us have no choice sound process model aircraft Much research work experimentation remain done little know right now can go long way toward reducing noise keeping flying fields hope manufacturers will get involved future since too have lot stake technology us today success depends applying specific problems Future research experimentation may provide bet ter methods meet lower sound objec tives have gratified other fliers club geographic area have shown greater awareness need fly quietlyand increasing interest involvement achieving goal breaking old habits developing new ones may find enjoy hobby past will really appreciate quieter models flight line Ive shared above information order fill needa need ef fective simple starting point embark upon sound proces sing approach quiet flight predict will new information new prod ucts appearing increasing rate meantime invest some time effort have fun above keep em flying RC AerobaticsNan Putte Continued page 45 Hed also like read about what expect bending moment center wing Obvi ously both topics tied together Ill work soon can Any other ideas RC Slope Soaring/Triebes Continued page 47 art system indispensable some competitive thermal flying and/or F3B As investing much money system really get what pay have inten tions continuing sport years come will undoubtedly run need such capabilities future true other things might well get best possible radio system can afford recently received letter Pierre Dume nil expressed very interesting idea malting videotape Slope Soaring finlshed will available clubs area would like get people involved Slope Soaring tape will great way show just what facet Soaring about Most people reluctant get involved something havent seen great way get Slope Soaring expo sure deserves talk Pierre sounds video going very highquality production shows aspects Slope Soaring youd like get copy videotape should available very soon just let know will pass word Pierre would like mention again will International Slope Race F3F Denmark sometime 1989 Anyone interested going either spectator competitor should get touch soon possible looks like will truly incredible event have urge go would highly rec ommend would really like thank whove sent letters and/or called response writings Slope Soaring response has greater ever imagined love help will able bring Slope Soaring forefront RC Soaring So keep letters photos calls coming 134 Model Aviation LiqIii LINE SYSTEMS P0 Box 1502 Lewiston 04241 FOAM CORE FLOATS PLANS AND KITS WE OFFER SELECTION OF FLOAT PLANS AND KITS FOR 4 12 POUND AIRPLANES WITH Y HULL ESIGN IN USE SINCE 1972 SEND SASE FOR CATALOG SHEET KIRCHER R/C PRODUCTS [NC 9 SHEFFIELD WAY CLARK NJ 07066 i A WE BUILD YOUR HELl TEST YOUR HELl PAIR YOUR HELl 322 North 7th St 64$ V11 Lehighton Pa 18235 WRITE OR CALL FOR INFORMA TION WOAL55 SOO5ST SCALP PHOtO SESVCP 500 PHOTO PACKS PLANS 3 VIEWS PHOTO-PACKS PLANS ENLARGING S*SE EnISr5O5 COPS lip Pepin&s Catalog $oo 60 pagesSCALE PlANS Eli PHOTO SERVICE 3209 Madsoo GeensOooo N C 27403 Phoop lnIal2a25239 INs ColleCt 77T L4TNES MILS lIETALS B00S PRECISI0N ISJSTR.MENTS - - CClIPFTE CAI$00 $200 IOn 8 SeIonR2 Sprngfo12 O8~ 43505 mpa 513 3220562 PAWU DIESELS Englands Finest 049 35 RIC STD Send $100 list Eric Clutton 913 Cedar Lane Tullahoma Tenn 37388 Send SSAE tsr catalog sheet complete line
Edition: Model Aviation - 1988/09
Page Numbers: 40, 41, 42, 43, 134
Three very effective nigh-quality bounamaster mufflers available Davis Diesel Development text has address left Model SM-I 40 61 size center larger SM-i 50 75 size right smaller SM-li 25 45 size mufflers substantially reduce sound levels will also increase engine rpm over what obtainable stock mufflers OBJECTIVE purpose article present three simple practical effec tive steps average RC sport flier can take reduce noise level model aircraft steps 1 buying making effective muffler 2 reprop ping engine 3 readjusting some flying methods following procedures will effect sound processing models rewards considerable will jus tit efforts wit will 1 find flying pleasurable lower sound levels 2 surprised mini mal effects upon actual flying quieter aircraft 3 gain satis faction taking positive constructive action assure future great hobby/sport ideas offered result ex perimenting working readily avail able products materials utilize construction techniques feasible modelers workshops Since believe reinventing wheel have re viewed wealth noise articles ideas appearing during past several years model aircraft publications cluding Model Aviation Radio Control Modeler RC Report am basing ef forts research experiments prod ucts offered number individuals companies including Gordon Banks RC research goes find better ways lessen sound models make present following practical information simple solutions can put practice now EGiI Weiss About Thoughts lowering gine noise en 40 Model Aviation Report Bob Davis Davis Diesel Develop ment Duke Fox Fox Engines John Hun ton K&B Manufacturing Don Lowe AMA President United Model Products Jim VanSant Bucks County RC Club others have contributed sound reduction efforts Background time clearly evi dent number reason losing flying sites across country noise European countries noise standards have imposed years now modelers have faced serious challenge lower sound levels compli ance United States real estate de velopment population expansion contin ues increasing rate modelers have recently begun realize impor tance reducing sound levels terest keeping flying fields Hand-in-hand cultivating positive public image modeling environmental considerations demand atten tion ever before Incidentally safety self-regulation next two im portant considerations acquiring keeping flying sites things made very evident clubs efforts acquire field southeastern Pennsylvania during past few years Refer article Profes sional Approach Finding Keeping Flying Field January 1988 Model Avia tion As involved modeler active flier three local clubs recently sociate vice-president AMA talk lots fellow modelers RC fliers locations became obvious noise must reduced obtain keep flying sites basic con tinued pursuit hobby club am currently presidentIMAA Chapter 168 Levittown Aerobugs Incnow finds its new field jeopardy cause nearby home construction hope keeping fine flying site through immediate noise reduction sound processing aircraft Initially because didnt really know spe cifically approach noise pro blem what about felt de pressed Although have built flown types RC aircraft Gliders Electrics four-stroke-powered models prefer two-cycle engines 25 60 displacement range Im alone popular engines chief noise cul prits article targeted being give up easily re searched information could find reducing noise lowering sound levels began experimenting various prod ucts methods learned can lower sound levels using simple expensive procedures makes both pleased positive about aeromodeling future great need part aeromodeling fraternity learn about adopt sound-reducing techniques motivated write article Others both locally elsewhere country have made similar efforts presented have likewise yielded positive re sults What Need Step No 1 Use effective muffler single-chamber expansion mufflers come current production engines just dont job require must better cool control expanding exhaust ga ses using technology both automo tive mufflers gun silencers muf flers need multiple expansion pipes small holes surrounded sound-absorbing materials cut down high-frequency noise greater annoyance Ex perimenting different silencer configu rations models specific design can help determine arrangement achieves optimal sound reduction least hinder ing performance final very important point bigger better mufflers con cerned Since intended article rather theoretical Ill limit myself following comments point must make some per sonal decisions relative time money effort simplest effective muf September 1988 41 no cneap effective beverage can after-muffler installed Midwest Bipe-stik Mount ing problems obvious lack aesthetics tend make unpopular setup though neat highly effective installation consists K&B 45 Sportster muffler mounted Enya 25 piece original Enya muffler modified make adapter fler install pride joy opinion Soundmaster available Davis Diesel Development Co Milford CT 1-203-877-1670 Notice didnt say least expensive considering quality ease installation imported mufflers value very good Several different sizes configurations offered including silenced tuned pipes four-stroke models type flying aircraft used determines model youll need Remember bigger better Simple adapters configure muf fler different engines photos shows mufflers stalled three models Tubing may also attached end mufflers further reduce sound redirect exhaust residue Bear mind using such muf flers actually increases engine performance up few hundred rpm Soundmaster muffler utilizes several internal baf fles conjunction exhaust pipe filled tiny holes gases enter offcenter design sets up swirling ef fect seems tune muffler increased performance diametrically opposite approach cost standpoint make use aftermuffler provides additional ex haust gas cooling acts second expan sion chamber may use either poly propylene 8- l0-oz fuel tank really cheap empty beverage can opted can seems cool things down bet ter simply enlarged pop-top opening installed 3-in piece silicone tuned pipe connector tubing using hightemperature RTV silicone sealer red color sealant readily available automotive stores has uses types muffler work make eight %-in holes rear can fuel tank clamp onto end engines regular muffler somewhat large unsightly poses some interesting mounting problemsbut does work simple aluminum clamp screwed plywood plate fuselage helps keep aftermuffler place Falling between above two extremes lies Land Ingenuity few bucks expense some time effort can have fun satisfac tion engineering building own muffler Being tinkerer gets much sat isfaction building things suit needs out existing products materi als Im element first highly successful venture adapting K&B Sportster 45 muffler ordered through local hobby shop Enya Schnuerle 25 engine cut off adapter end stock Enya muf fler fit between exhaust port K&B muffler About hour file drill gave professional-looking job put engines sound level 86 dBA 9 ftless half AMA sound guideline combination can seen photos sons trusty Eaglet 50 flies effortlessly half thrQttle now quiet can hardly hear write K&B identify en gine understand will custom make adapter excellent mufflers mufflers incidentally built baffles similar automotive ones K&Bs sporster series engines leading way application re duced sound techniques Other manufactur ers likely follow suit During past months have col lecting sort junk box potential muffler-making materials ex periment trip hobby shop building supply/hardware store etc look goodies Some best finds have trash cans home dis carded piles materials work Brass tub ing various diameters coarse steel wool scraps pipe variety aerosol cans have provided materials best efforts successes larger muffler photos fits Enya 40-and 45size engines light easy mount highly effective Utilizing stock muffler initial low-frequency noise expan sion chamber adapted empty alumi num can contained hair mousse product second chamber ab sorb high-frequency noise An s tube drilled lots tiny A6-in holes goes through entire length muf fler small setscrew holds place stock muffler tail pipe silicone sealer applied pipe exits rear can also latter force fit ted onto stock muffler Prior final sembly inside mousse can loosely packed coarse steel wool muffler based both automotive gun silencer technology requires no brazing other special construction techniques Its design offshoot article January 1985 RCM similar efforts other local fliers except simplified construction lightened en hanced its looks using readily avail able mousse can original paint sanded off go route make sure can empty before carefully wiggle off top pliers Depending stock muf fler use cut rolled metal rim off top can use Y4 -in dowel swag opening required size rolling can hard surface hand putting pressure dowel turning down enlarging opening other hand Another mufflers made stock STM sold United Model Prod ucts through hobby shops used brass tube insert lots holes steel wool packing installing model 25size engine limited imagination once get involved design ing building own mufflers universal adapters commercial prod42 Model Aviation Assorted parts reiated JunK author uses fabricate mufflers Enys muf fler mousse can brass tube center picture parts used make muffler pictured below black hoses Du-Bro exhaust extension available hobby shops best results particular engine use Imagination experiment authors homemade mousse muffler lowered engine noise impressive 12 dbA 500 rpm drop engine speed caused no problems Great Planes Sportster 40 flies lower muffler STM 3141 modified adding brass pipe packing coarse steel wool sheet brass reduction plate adapts 40size muffler use 25 Remember bigger better comes mufflers ucts can further modified smaller en gines using thin brass stock smaller openings cut placed between muffler adapter plate exhaust port engine K&S brass products available hobby shops excel lent source materials last note mufflers tuned pipe advocatesuse silenced tuned pipes have internal baffles cannot see light through pipes de signed Pattern planes using long-stroke engines high-pitched props Speaking props ready move Step No 2 Reprop aircraft Next engine exhaust propeller second largest source noise Keep mind sound additive source part total sound output Realizing much dont know about prop noise AMA re cently undertook research project topic collaboration North Carolina State University Since need act now lets put use what knowledge already have today main objective keep down tip velocity propellers using higherpitch smaller-diameter props will help achieve us have increased prop diameters order decrease rpm course also quiets things down engine running hard ex haust gas pressure lessened However drawback larger props tips travel greater distance increa ses speedand thats definitely no good regard quieting things down productive steps take increase usual propeller pitch least inch example nor mally use 10 x 6 40-size engine try 10 x 7 10 x 8 60 use 11 x 8 12 x 7 Some props may hard get available must go larger diameter either hold same pitch go up inch de crease pitch Contrary popular belief moderate increases pitch decreases rpm will overload engine radi cally change aircraft performance Three bladed props should also experimented Make sure carefully balance props vibration whatever source significant producer noise Some ex perimenting tachometer dB meter various props will dramatically complement other efforts reducing noise Also bear mind thin-bladed stiff props quietest round ing corners prop tips helps too Just careful try modifications could prove dangerous Try different makes different types propellers such wide-bladed four-stroke variety determine what works best Step No 3 Readjust flying thods major problems hu man beings resistance change find difficult break old habits try something new flexible better can cope change lessen frustrations enjoy ourselves Part being flexible involves ability com promise art best problem-solving tools have above mind need reor ient ourselves quest maximum noise reduction Listed below several important points act upon Always put largest size engine practical models design calls 25 40 engine use 40 40 60 aircraft use 60 cause flying half two-thirds throttle really cuts noise Overpowering model will reduce noise fly accor dingly B conjunction preceding throttle back dont need full power Did ever hear piotted aircraft roar around continuously full power use full throttle takeoff pull back after climb-out Learn use left hand break old habit con stantly flying full power Reserve takeoffs vertical maneuvers will find sound-processed model will realistic because closely approximates sound footprint its full-scale counterpart C assist keeping engine cool consistent lowering rpm use fuel 5% nitro content Continued page 134 September 1988 43 Z2ZtWincheEZ NEW SPACE SAVING CONTAINER FitsinYourBox 2Ax7%highx9% Tough Rigid Polyethylene udes Tubing eners Lock Tubing Through Cap ostage North Products PO Box 18419 Cleveland Heights OH 44118 II'I pack balanced cell shorted probably makes sense replace bad cell pair cells thats way packaged As can see pictures cells Kraft synthesizer transmitter packaged pairs replaced whole pack need transmitter Myers/Aberle tests want best contact friend Larry Sribnick SR Batteries Box 287 Bellport NY 11713 516 286-0079 SR can will supply packs connectors equipment manufactured Ace RJC Airtronics Cannon Cirrus Cox/Sanwa Futaba Kraft Tower some World Engines anything Deans con nector cant find source manufacturers connector can always use Deans Connectors Ace R/C see above contact SR help As example havent able find source Hi-Tee connec tor used Polks World Engines use Deans As cells themselves SR will suggest al ternatives like SR900s will fit place SOOs will make up packs special configu rations number cells L shapes stacked packs etc keep up-todate file original transmitter battery pack con figurations can make up literally pack need Though dont like doing SR will re place individual cells pack chafg ing $2 over cost materials giving pack full five-day test sequence insure worthy continued use Some manufacturers make battery pack replace ment simple plug-in matter Airtronlcs others make take apart transmitter af fair case Kraft faced latter situation least bit hesitant about making change turn prob lem over serviceman Check warranty first Im still vacation Happy flying Noise/Weiss Continued page 43 D Always build maintain air craft ensure minimum vibration levels Sounds vibrating pushrods loose fit tings loose coverings less-than-solid airframes contribute noise lot room research experimenta tion engine-mounting techniques related structural considerations E Last least some minor per formance compromises will sometimes necessary keep flying sites will ing accept open mind Once get familiar terms quieter aircraft will actually enjoy results effort Conclusions todays world us have no choice sound process model aircraft Much research work experimentation remain done little know right now can go long way toward reducing noise keeping flying fields hope manufacturers will get involved future since too have lot stake technology us today success depends applying specific problems Future research experimentation may provide bet ter methods meet lower sound objec tives have gratified other fliers club geographic area have shown greater awareness need fly quietlyand increasing interest involvement achieving goal breaking old habits developing new ones may find enjoy hobby past will really appreciate quieter models flight line Ive shared above information order fill needa need ef fective simple starting point embark upon sound proces sing approach quiet flight predict will new information new prod ucts appearing increasing rate meantime invest some time effort have fun above keep em flying RC AerobaticsNan Putte Continued page 45 Hed also like read about what expect bending moment center wing Obvi ously both topics tied together Ill work soon can Any other ideas RC Slope Soaring/Triebes Continued page 47 art system indispensable some competitive thermal flying and/or F3B As investing much money system really get what pay have inten tions continuing sport years come will undoubtedly run need such capabilities future true other things might well get best possible radio system can afford recently received letter Pierre Dume nil expressed very interesting idea malting videotape Slope Soaring finlshed will available clubs area would like get people involved Slope Soaring tape will great way show just what facet Soaring about Most people reluctant get involved something havent seen great way get Slope Soaring expo sure deserves talk Pierre sounds video going very highquality production shows aspects Slope Soaring youd like get copy videotape should available very soon just let know will pass word Pierre would like mention again will International Slope Race F3F Denmark sometime 1989 Anyone interested going either spectator competitor should get touch soon possible looks like will truly incredible event have urge go would highly rec ommend would really like thank whove sent letters and/or called response writings Slope Soaring response has greater ever imagined love help will able bring Slope Soaring forefront RC Soaring So keep letters photos calls coming 134 Model Aviation LiqIii LINE SYSTEMS P0 Box 1502 Lewiston 04241 FOAM CORE FLOATS PLANS AND KITS WE OFFER SELECTION OF FLOAT PLANS AND KITS FOR 4 12 POUND AIRPLANES WITH Y HULL ESIGN IN USE SINCE 1972 SEND SASE FOR CATALOG SHEET KIRCHER R/C PRODUCTS [NC 9 SHEFFIELD WAY CLARK NJ 07066 i A WE BUILD YOUR HELl TEST YOUR HELl PAIR YOUR HELl 322 North 7th St 64$ V11 Lehighton Pa 18235 WRITE OR CALL FOR INFORMA TION WOAL55 SOO5ST SCALP PHOtO SESVCP 500 PHOTO PACKS PLANS 3 VIEWS PHOTO-PACKS PLANS ENLARGING S*SE EnISr5O5 COPS lip Pepin&s Catalog $oo 60 pagesSCALE PlANS Eli PHOTO SERVICE 3209 Madsoo GeensOooo N C 27403 Phoop lnIal2a25239 INs ColleCt 77T L4TNES MILS lIETALS B00S PRECISI0N ISJSTR.MENTS - - CClIPFTE CAI$00 $200 IOn 8 SeIonR2 Sprngfo12 O8~ 43505 mpa 513 3220562 PAWU DIESELS Englands Finest 049 35 RIC STD Send $100 list Eric Clutton 913 Cedar Lane Tullahoma Tenn 37388 Send SSAE tsr catalog sheet complete line
Edition: Model Aviation - 1988/09
Page Numbers: 40, 41, 42, 43, 134
Three very effective nigh-quality bounamaster mufflers available Davis Diesel Development text has address left Model SM-I 40 61 size center larger SM-i 50 75 size right smaller SM-li 25 45 size mufflers substantially reduce sound levels will also increase engine rpm over what obtainable stock mufflers OBJECTIVE purpose article present three simple practical effec tive steps average RC sport flier can take reduce noise level model aircraft steps 1 buying making effective muffler 2 reprop ping engine 3 readjusting some flying methods following procedures will effect sound processing models rewards considerable will jus tit efforts wit will 1 find flying pleasurable lower sound levels 2 surprised mini mal effects upon actual flying quieter aircraft 3 gain satis faction taking positive constructive action assure future great hobby/sport ideas offered result ex perimenting working readily avail able products materials utilize construction techniques feasible modelers workshops Since believe reinventing wheel have re viewed wealth noise articles ideas appearing during past several years model aircraft publications cluding Model Aviation Radio Control Modeler RC Report am basing ef forts research experiments prod ucts offered number individuals companies including Gordon Banks RC research goes find better ways lessen sound models make present following practical information simple solutions can put practice now EGiI Weiss About Thoughts lowering gine noise en 40 Model Aviation Report Bob Davis Davis Diesel Develop ment Duke Fox Fox Engines John Hun ton K&B Manufacturing Don Lowe AMA President United Model Products Jim VanSant Bucks County RC Club others have contributed sound reduction efforts Background time clearly evi dent number reason losing flying sites across country noise European countries noise standards have imposed years now modelers have faced serious challenge lower sound levels compli ance United States real estate de velopment population expansion contin ues increasing rate modelers have recently begun realize impor tance reducing sound levels terest keeping flying fields Hand-in-hand cultivating positive public image modeling environmental considerations demand atten tion ever before Incidentally safety self-regulation next two im portant considerations acquiring keeping flying sites things made very evident clubs efforts acquire field southeastern Pennsylvania during past few years Refer article Profes sional Approach Finding Keeping Flying Field January 1988 Model Avia tion As involved modeler active flier three local clubs recently sociate vice-president AMA talk lots fellow modelers RC fliers locations became obvious noise must reduced obtain keep flying sites basic con tinued pursuit hobby club am currently presidentIMAA Chapter 168 Levittown Aerobugs Incnow finds its new field jeopardy cause nearby home construction hope keeping fine flying site through immediate noise reduction sound processing aircraft Initially because didnt really know spe cifically approach noise pro blem what about felt de pressed Although have built flown types RC aircraft Gliders Electrics four-stroke-powered models prefer two-cycle engines 25 60 displacement range Im alone popular engines chief noise cul prits article targeted being give up easily re searched information could find reducing noise lowering sound levels began experimenting various prod ucts methods learned can lower sound levels using simple expensive procedures makes both pleased positive about aeromodeling future great need part aeromodeling fraternity learn about adopt sound-reducing techniques motivated write article Others both locally elsewhere country have made similar efforts presented have likewise yielded positive re sults What Need Step No 1 Use effective muffler single-chamber expansion mufflers come current production engines just dont job require must better cool control expanding exhaust ga ses using technology both automo tive mufflers gun silencers muf flers need multiple expansion pipes small holes surrounded sound-absorbing materials cut down high-frequency noise greater annoyance Ex perimenting different silencer configu rations models specific design can help determine arrangement achieves optimal sound reduction least hinder ing performance final very important point bigger better mufflers con cerned Since intended article rather theoretical Ill limit myself following comments point must make some per sonal decisions relative time money effort simplest effective muf September 1988 41 no cneap effective beverage can after-muffler installed Midwest Bipe-stik Mount ing problems obvious lack aesthetics tend make unpopular setup though neat highly effective installation consists K&B 45 Sportster muffler mounted Enya 25 piece original Enya muffler modified make adapter fler install pride joy opinion Soundmaster available Davis Diesel Development Co Milford CT 1-203-877-1670 Notice didnt say least expensive considering quality ease installation imported mufflers value very good Several different sizes configurations offered including silenced tuned pipes four-stroke models type flying aircraft used determines model youll need Remember bigger better Simple adapters configure muf fler different engines photos shows mufflers stalled three models Tubing may also attached end mufflers further reduce sound redirect exhaust residue Bear mind using such muf flers actually increases engine performance up few hundred rpm Soundmaster muffler utilizes several internal baf fles conjunction exhaust pipe filled tiny holes gases enter offcenter design sets up swirling ef fect seems tune muffler increased performance diametrically opposite approach cost standpoint make use aftermuffler provides additional ex haust gas cooling acts second expan sion chamber may use either poly propylene 8- l0-oz fuel tank really cheap empty beverage can opted can seems cool things down bet ter simply enlarged pop-top opening installed 3-in piece silicone tuned pipe connector tubing using hightemperature RTV silicone sealer red color sealant readily available automotive stores has uses types muffler work make eight %-in holes rear can fuel tank clamp onto end engines regular muffler somewhat large unsightly poses some interesting mounting problemsbut does work simple aluminum clamp screwed plywood plate fuselage helps keep aftermuffler place Falling between above two extremes lies Land Ingenuity few bucks expense some time effort can have fun satisfac tion engineering building own muffler Being tinkerer gets much sat isfaction building things suit needs out existing products materi als Im element first highly successful venture adapting K&B Sportster 45 muffler ordered through local hobby shop Enya Schnuerle 25 engine cut off adapter end stock Enya muf fler fit between exhaust port K&B muffler About hour file drill gave professional-looking job put engines sound level 86 dBA 9 ftless half AMA sound guideline combination can seen photos sons trusty Eaglet 50 flies effortlessly half thrQttle now quiet can hardly hear write K&B identify en gine understand will custom make adapter excellent mufflers mufflers incidentally built baffles similar automotive ones K&Bs sporster series engines leading way application re duced sound techniques Other manufactur ers likely follow suit During past months have col lecting sort junk box potential muffler-making materials ex periment trip hobby shop building supply/hardware store etc look goodies Some best finds have trash cans home dis carded piles materials work Brass tub ing various diameters coarse steel wool scraps pipe variety aerosol cans have provided materials best efforts successes larger muffler photos fits Enya 40-and 45size engines light easy mount highly effective Utilizing stock muffler initial low-frequency noise expan sion chamber adapted empty alumi num can contained hair mousse product second chamber ab sorb high-frequency noise An s tube drilled lots tiny A6-in holes goes through entire length muf fler small setscrew holds place stock muffler tail pipe silicone sealer applied pipe exits rear can also latter force fit ted onto stock muffler Prior final sembly inside mousse can loosely packed coarse steel wool muffler based both automotive gun silencer technology requires no brazing other special construction techniques Its design offshoot article January 1985 RCM similar efforts other local fliers except simplified construction lightened en hanced its looks using readily avail able mousse can original paint sanded off go route make sure can empty before carefully wiggle off top pliers Depending stock muf fler use cut rolled metal rim off top can use Y4 -in dowel swag opening required size rolling can hard surface hand putting pressure dowel turning down enlarging opening other hand Another mufflers made stock STM sold United Model Prod ucts through hobby shops used brass tube insert lots holes steel wool packing installing model 25size engine limited imagination once get involved design ing building own mufflers universal adapters commercial prod42 Model Aviation Assorted parts reiated JunK author uses fabricate mufflers Enys muf fler mousse can brass tube center picture parts used make muffler pictured below black hoses Du-Bro exhaust extension available hobby shops best results particular engine use Imagination experiment authors homemade mousse muffler lowered engine noise impressive 12 dbA 500 rpm drop engine speed caused no problems Great Planes Sportster 40 flies lower muffler STM 3141 modified adding brass pipe packing coarse steel wool sheet brass reduction plate adapts 40size muffler use 25 Remember bigger better comes mufflers ucts can further modified smaller en gines using thin brass stock smaller openings cut placed between muffler adapter plate exhaust port engine K&S brass products available hobby shops excel lent source materials last note mufflers tuned pipe advocatesuse silenced tuned pipes have internal baffles cannot see light through pipes de signed Pattern planes using long-stroke engines high-pitched props Speaking props ready move Step No 2 Reprop aircraft Next engine exhaust propeller second largest source noise Keep mind sound additive source part total sound output Realizing much dont know about prop noise AMA re cently undertook research project topic collaboration North Carolina State University Since need act now lets put use what knowledge already have today main objective keep down tip velocity propellers using higherpitch smaller-diameter props will help achieve us have increased prop diameters order decrease rpm course also quiets things down engine running hard ex haust gas pressure lessened However drawback larger props tips travel greater distance increa ses speedand thats definitely no good regard quieting things down productive steps take increase usual propeller pitch least inch example nor mally use 10 x 6 40-size engine try 10 x 7 10 x 8 60 use 11 x 8 12 x 7 Some props may hard get available must go larger diameter either hold same pitch go up inch de crease pitch Contrary popular belief moderate increases pitch decreases rpm will overload engine radi cally change aircraft performance Three bladed props should also experimented Make sure carefully balance props vibration whatever source significant producer noise Some ex perimenting tachometer dB meter various props will dramatically complement other efforts reducing noise Also bear mind thin-bladed stiff props quietest round ing corners prop tips helps too Just careful try modifications could prove dangerous Try different makes different types propellers such wide-bladed four-stroke variety determine what works best Step No 3 Readjust flying thods major problems hu man beings resistance change find difficult break old habits try something new flexible better can cope change lessen frustrations enjoy ourselves Part being flexible involves ability com promise art best problem-solving tools have above mind need reor ient ourselves quest maximum noise reduction Listed below several important points act upon Always put largest size engine practical models design calls 25 40 engine use 40 40 60 aircraft use 60 cause flying half two-thirds throttle really cuts noise Overpowering model will reduce noise fly accor dingly B conjunction preceding throttle back dont need full power Did ever hear piotted aircraft roar around continuously full power use full throttle takeoff pull back after climb-out Learn use left hand break old habit con stantly flying full power Reserve takeoffs vertical maneuvers will find sound-processed model will realistic because closely approximates sound footprint its full-scale counterpart C assist keeping engine cool consistent lowering rpm use fuel 5% nitro content Continued page 134 September 1988 43 Z2ZtWincheEZ NEW SPACE SAVING CONTAINER FitsinYourBox 2Ax7%highx9% Tough Rigid Polyethylene udes Tubing eners Lock Tubing Through Cap ostage North Products PO Box 18419 Cleveland Heights OH 44118 II'I pack balanced cell shorted probably makes sense replace bad cell pair cells thats way packaged As can see pictures cells Kraft synthesizer transmitter packaged pairs replaced whole pack need transmitter Myers/Aberle tests want best contact friend Larry Sribnick SR Batteries Box 287 Bellport NY 11713 516 286-0079 SR can will supply packs connectors equipment manufactured Ace RJC Airtronics Cannon Cirrus Cox/Sanwa Futaba Kraft Tower some World Engines anything Deans con nector cant find source manufacturers connector can always use Deans Connectors Ace R/C see above contact SR help As example havent able find source Hi-Tee connec tor used Polks World Engines use Deans As cells themselves SR will suggest al ternatives like SR900s will fit place SOOs will make up packs special configu rations number cells L shapes stacked packs etc keep up-todate file original transmitter battery pack con figurations can make up literally pack need Though dont like doing SR will re place individual cells pack chafg ing $2 over cost materials giving pack full five-day test sequence insure worthy continued use Some manufacturers make battery pack replace ment simple plug-in matter Airtronlcs others make take apart transmitter af fair case Kraft faced latter situation least bit hesitant about making change turn prob lem over serviceman Check warranty first Im still vacation Happy flying Noise/Weiss Continued page 43 D Always build maintain air craft ensure minimum vibration levels Sounds vibrating pushrods loose fit tings loose coverings less-than-solid airframes contribute noise lot room research experimenta tion engine-mounting techniques related structural considerations E Last least some minor per formance compromises will sometimes necessary keep flying sites will ing accept open mind Once get familiar terms quieter aircraft will actually enjoy results effort Conclusions todays world us have no choice sound process model aircraft Much research work experimentation remain done little know right now can go long way toward reducing noise keeping flying fields hope manufacturers will get involved future since too have lot stake technology us today success depends applying specific problems Future research experimentation may provide bet ter methods meet lower sound objec tives have gratified other fliers club geographic area have shown greater awareness need fly quietlyand increasing interest involvement achieving goal breaking old habits developing new ones may find enjoy hobby past will really appreciate quieter models flight line Ive shared above information order fill needa need ef fective simple starting point embark upon sound proces sing approach quiet flight predict will new information new prod ucts appearing increasing rate meantime invest some time effort have fun above keep em flying RC AerobaticsNan Putte Continued page 45 Hed also like read about what expect bending moment center wing Obvi ously both topics tied together Ill work soon can Any other ideas RC Slope Soaring/Triebes Continued page 47 art system indispensable some competitive thermal flying and/or F3B As investing much money system really get what pay have inten tions continuing sport years come will undoubtedly run need such capabilities future true other things might well get best possible radio system can afford recently received letter Pierre Dume nil expressed very interesting idea malting videotape Slope Soaring finlshed will available clubs area would like get people involved Slope Soaring tape will great way show just what facet Soaring about Most people reluctant get involved something havent seen great way get Slope Soaring expo sure deserves talk Pierre sounds video going very highquality production shows aspects Slope Soaring youd like get copy videotape should available very soon just let know will pass word Pierre would like mention again will International Slope Race F3F Denmark sometime 1989 Anyone interested going either spectator competitor should get touch soon possible looks like will truly incredible event have urge go would highly rec ommend would really like thank whove sent letters and/or called response writings Slope Soaring response has greater ever imagined love help will able bring Slope Soaring forefront RC Soaring So keep letters photos calls coming 134 Model Aviation LiqIii LINE SYSTEMS P0 Box 1502 Lewiston 04241 FOAM CORE FLOATS PLANS AND KITS WE OFFER SELECTION OF FLOAT PLANS AND KITS FOR 4 12 POUND AIRPLANES WITH Y HULL ESIGN IN USE SINCE 1972 SEND SASE FOR CATALOG SHEET KIRCHER R/C PRODUCTS [NC 9 SHEFFIELD WAY CLARK NJ 07066 i A WE BUILD YOUR HELl TEST YOUR HELl PAIR YOUR HELl 322 North 7th St 64$ V11 Lehighton Pa 18235 WRITE OR CALL FOR INFORMA TION WOAL55 SOO5ST SCALP PHOtO SESVCP 500 PHOTO PACKS PLANS 3 VIEWS PHOTO-PACKS PLANS ENLARGING S*SE EnISr5O5 COPS lip Pepin&s Catalog $oo 60 pagesSCALE PlANS Eli PHOTO SERVICE 3209 Madsoo GeensOooo N C 27403 Phoop lnIal2a25239 INs ColleCt 77T L4TNES MILS lIETALS B00S PRECISI0N ISJSTR.MENTS - - CClIPFTE CAI$00 $200 IOn 8 SeIonR2 Sprngfo12 O8~ 43505 mpa 513 3220562 PAWU DIESELS Englands Finest 049 35 RIC STD Send $100 list Eric Clutton 913 Cedar Lane Tullahoma Tenn 37388 Send SSAE tsr catalog sheet complete line