PERIODICALLY read aircraft design arti cles about prevent control surface flutter cases suggestions good ideas use delaying onset phenomenon few actually work prevent ing flutter Before get subject further few things need clarified First classical sense what modelers usually call control surface flutter isnt flutter bMt con trol surface buzz Flutter engineers reserve word flutter describe oscillatory selfsustaining motion aircraft components involves interaction two modes component motion Control surface buzz volves mode aircraft component motion Big deal right flutter engineer distinction important because describes completely dif ferent mechanism interactions modelers distinction usually important because seldom observe classical flutter Flutter inherently destructive flutter speed aircraft components bend and/or twist sustained oscillations amplitudes neither decrease increase However once flutter speed exceeded oscillations grow ampli tude until something breaks otherwise changes relationships among affected aircraft components modern fighters must loaded external stores very carefully beFigure 1 Balancing control surface eliminates flutter Putting mechanism outside easiest drawbacks very pretty hardware can catch things Figure 2 Another way mass-balance control surface Neat hard make Elevator Horn Du-Bro EZ connectors Fishing Weight 1A6-in Music Wire 1As.in Wheel Collars Figure 3 Bowing inevitabledo easiest way Heres suggested set common materials use neat functional job statically balancing control surface trol surface buzz Im going turn around call control surface flutter anyway because thats what us call kind motion involves oscillatory rotation aileron elevator caused way hinge way move Since hinged front center mass surface behind hinge point often moved via torque rod en ters inboard end surface com bination two design features pro duces control surface flutter once have speed will have make control surface torque rod stiffer causes natural frequency aileron rotation increase causes flutter occur higher airspeed However suppose try both tech niques still have flutter thing else can done Yes few possible correctives like removing con trol surface replacing thick er leading edge trailing edge wing horizontal tail attached can also make trailing edge control surface blunt Both fixes also tend inBack February 1988 column author Van Putte suggested way get differential aileron travel bend aileron horn forward Some people felt would no good Ron drew sketch prove point radiuses arc R represent control horn position servo L gives equal Up Down inputs noticeable difference control horn travel between Neu tral position Up compared travel Neutral Down sketch illustrates aileron horn low-wing airplane cause thin flexible wings potential flut ter victims have observed case model flutter happened early version Sen ior Falcon original wing design much less rigid both bending torsion present wing aircraft went classi cal case wing bending/torsion flutter bot tom near-vertical dive right wing sepa rated aircraft about wing sheeting ended Senior Falcons dont fly too well littie half wing Now having pointed out control surface flutter isnt really flutter actually conNeutral Down UpNeutralDown Up flutter youre lucky flutter speed faster airplane capable achieving case youll never have flutter some techniques prevent flutter successful two common flutter-prevention tech niques work opposite ends problem easiest implement sealing gap tween control surface wing horizon tal stabilizer attacks aerodynamic driver flutter problem will cause flutter oc cur higher airspeed second fix 50 Model Aviation Radio Confrol Sport Aerobatics Ron Van Putte III Sleepr Oaks Rd Ft Walton Beach FL 32548 crease airplane speed flutter occursa Still have flutter must ready cure-all control surface static balance Its pretty works time What must move center mass control surface just front hinge line flutter will occur airspeed several ways statically balance control sur faces Figure 1 shows functionally accom plish ways implement problems static balancing youll probably have mechanism out breeze will snag things although have seen some really neat static balancing jobs hidden inside wing Figure 2 Figure 3 shows straightforward way bal ance control surface using common materials recommended ease installation struc tural integrity ability change weights What must get balance weight large enough cause control surface bare ly move up released neutral position Dont forget disconnect servo linkage first before course assumed control surface hinges nice free surface will flop down released no balance weights used Dont overdo static balancing elevators because can create another problem An overly bal anced elevator will tend move Up positive-U maneuvers like loops causes higher Us causes elevator move Up lifornia recently visiting Hughes Aircraft Company Canoga Park northwest Los Angeles Since Canoga Park decided take LR Taylor Power Pacer see could get repaired seems Power Pacer doesnt like have trans mitter pack plugged leads testing re ceiver pack Some bozo did just receiver side didnt work Fortu nately LR Taylor shop 20831 Roscoe Blvd Canoga Park CA 91306 two miles away Hughes complex able get after conducting business Hughes short order Power Pacer repaired recalibrated remainder hour long chat owner did talking must lonesome being cooped up nothing electronic gear talk day reason mentioned visit LR Taylor wasnt sure still business Id tried get some Power Pacers some guys club back order six eight months turned out source Id ordered hadnt bothered place order LR Taylor would never have come LR Taylor still business just have go right source Ever since wrote piece aileron differen tial February 1988 column have gotten several letters about Some requests information rest attempts show techniques obtain differ ential wouldnt work letters requesting information invariably about whether techniques Id de picted high-wing low-wing air planes Refer figures February column Figure 1 2 refer way get dif ferential low-wing airplane either bend ing aileron torque arms forward attach ing pushrods aileron servo wheel Continued page 160 Try Something Better Through years pushrods have made wiTh kinds mate rials some worked great others didnt Some prefer use simple piece piano wire change length temperature humid ity Others prefer glue smaiier pieces piano wIre iong strips wood messy Involved Dave Brown Products Fibergiass Pushrod System designed easy installation application tubes made fiberglass very high strength very little weight several end fittings pre-drilled regular V pushrods its never easier Ask dealer friend about Dave Brown Products Products friends recommend Order Number 5400-PRDS pushrod system indudes five end fitfngs Two drilled 1116 piano wire servo end Two drilled Kwik-Unk rods control surface end double drilled Kwik-Link rods Y type ptishrod anhedral dihedral stabs swept elevator hinge line DAVE BROWN PRODUCTS L56 Layhigh Rd Hamilton Ohio 45013 13 738-1576 May 1988 51 RC Electrics/Kopski Continued page 154 ted organization members wish promote fact Electrics fly well help new comers Electric endeavor good info came editor Current Flow Steve Moskal Steve can reached 30 S Ken sington Ave LaGrange IL 60525 tele phone number 312 354-2803 Interested mod elers might try giving Steve shout tell im Bob sent yal Andmy own best wishes EMF Oh woe unbounded griefl Another column endingwith much left pass along next month Happy silent landings everyone RC Aerobatics/Van Putte Continued page 51 aileron side wheel want get aileron differential high-wing airplane both techniques must re versed ie bend aileron torque arms back attach pushrods aileron servo wheel side opposite ailerons Doubting Thomas letter writers mailed copy Figure 4 shows what hap pens have equal servo output same both directions low-wing airplane can clearly see Up Down use both techniques youll get differential really surprised number letters received about design tips Id included March 1988 column uniformly en thusiastic support of same kind design ideas So next month Ill include some ideas proper design vertical fin tales about tails RC Pylon Racing/Hager Continued page 52 very consistent work up slowly towards prop speed Take time work fuel system including shutoff until works flawlessly Airplane balance control Another com mon mistake opinion fact people set up airplanes too sensitive controls Concentrate flying smoothly like tame airplane down desensitizing Kits controls Use enough get airplane Item around course Too much throw can get Thunder trouble make erratic flying Use QIt full travel joystick order get maximum resolution feel setup critical surface elevator China Make sure CG comes Out exactly mdi- Clipper cated plans Start off recommend- T-railed ed throws listed plans Fly airplane set throw elevator full stick trav el obtain turns radius slightly smaller 100 ft enough al- Spickler lows start pylon 2-3 turn slowly using maybe half stick travel around No 2 end up Texas Out going around No 3 stick bottomed out law always pull full Up elevator No 1 except first lap Stay same altitude around Scat Cat course Try climb dive too much Next like set ailerons up slow airplane would just barely roll twice going down straights gave full aileron throw set up rudder get minimum travel possible smallest servo output wheel using farthest hole control horn throw ends up too much fore takeoff end up using about V Right rudder travel stick closing want stress again pure speed what wins race Being consistent flying smooth tight wins race Thanks Tom rest list people compa nies sell Racing products list began April 1988 column Quickie 500 Manufact urer Phone Address Pauls Fly 619 743ing Stuff 5458 Paul Steinberg Model Tech California Speed Products PO Box 121 Escondido CA 92025 Hobby Stores 714 661- 32221 Alipaz #15 7430 San Juan Capistrano CA 92675 Hobby Stores Spickler Models Ritchs 713 661Hobbies 5458 Dick Ritch Flue Line Models 4104 Lark Houston TX 77025 Hobby Stores Continued page 162 install hinges hate Try Easy Hinges See Difference single slol s few drops C/A glue ssd its dsne No geuging pinning sr hinge pins wsrrs absuf Iscredibly strssg Virtually indeslructible 24 hinges 295 e e4 oa Za en INE PO Box 1743 Marcos CA 92069 flUe W fl1SiX V1W CWit fl5 LW ISUhuhIt ccie Ia m5uled Hal & mnd Lanai Wzdsgl j um _ntomrss 4 Power Only certified checks money orders accepsed Minimum order S1OO0to three packases 4 Powerpoles 5315 per pasfsage siCto shipping Sendlinat CT rnsidenfs add 75% sales tao Prices sabiect c5angenithosf notion DEALER iNQUiRIES INVITED farther information deale prices send SASh Basiness Card SERMOS RIC SNAP CONNECTORS Cedas Canes S Box 16787 Slanted CT 069203322-6294 160 Model Aviation qowsagSnrx zun IW Cussomlzed nawest German engInes noefrom vault Muffiw Mount MountIng Bolts y Presmirs Tap Smoke Carburetor LInkage CDI IgnltlonfCl4 EleclronloaL 48 Volt IgnitIon Pack Safety a0 Sitdi SIx-Bolt Hub ResIstor Spark Plugs Veer Wanenty Faulty Paresand WakmuultIp TaG MFG 857 High Mountain Rd North Haledon TO Law 200ulyRowhi Glese body wheel pant. end cowl P ft N5flO 51011 Poem wing al bale Included Sach 31 wllh points Included avahleblel Mw2pI--mn-i EDO FLOATS /a SCALE 46 LONG SEND $200 FOR COMPLETE CATALOG OF FINE KITS IKON NWST P0 Box 306 MA ~ PosI Falls ID 83854 yr 081 7739001
Edition: Model Aviation - 1988/05
Page Numbers: 50, 51, 160
PERIODICALLY read aircraft design arti cles about prevent control surface flutter cases suggestions good ideas use delaying onset phenomenon few actually work prevent ing flutter Before get subject further few things need clarified First classical sense what modelers usually call control surface flutter isnt flutter bMt con trol surface buzz Flutter engineers reserve word flutter describe oscillatory selfsustaining motion aircraft components involves interaction two modes component motion Control surface buzz volves mode aircraft component motion Big deal right flutter engineer distinction important because describes completely dif ferent mechanism interactions modelers distinction usually important because seldom observe classical flutter Flutter inherently destructive flutter speed aircraft components bend and/or twist sustained oscillations amplitudes neither decrease increase However once flutter speed exceeded oscillations grow ampli tude until something breaks otherwise changes relationships among affected aircraft components modern fighters must loaded external stores very carefully beFigure 1 Balancing control surface eliminates flutter Putting mechanism outside easiest drawbacks very pretty hardware can catch things Figure 2 Another way mass-balance control surface Neat hard make Elevator Horn Du-Bro EZ connectors Fishing Weight 1A6-in Music Wire 1As.in Wheel Collars Figure 3 Bowing inevitabledo easiest way Heres suggested set common materials use neat functional job statically balancing control surface trol surface buzz Im going turn around call control surface flutter anyway because thats what us call kind motion involves oscillatory rotation aileron elevator caused way hinge way move Since hinged front center mass surface behind hinge point often moved via torque rod en ters inboard end surface com bination two design features pro duces control surface flutter once have speed will have make control surface torque rod stiffer causes natural frequency aileron rotation increase causes flutter occur higher airspeed However suppose try both tech niques still have flutter thing else can done Yes few possible correctives like removing con trol surface replacing thick er leading edge trailing edge wing horizontal tail attached can also make trailing edge control surface blunt Both fixes also tend inBack February 1988 column author Van Putte suggested way get differential aileron travel bend aileron horn forward Some people felt would no good Ron drew sketch prove point radiuses arc R represent control horn position servo L gives equal Up Down inputs noticeable difference control horn travel between Neu tral position Up compared travel Neutral Down sketch illustrates aileron horn low-wing airplane cause thin flexible wings potential flut ter victims have observed case model flutter happened early version Sen ior Falcon original wing design much less rigid both bending torsion present wing aircraft went classi cal case wing bending/torsion flutter bot tom near-vertical dive right wing sepa rated aircraft about wing sheeting ended Senior Falcons dont fly too well littie half wing Now having pointed out control surface flutter isnt really flutter actually conNeutral Down UpNeutralDown Up flutter youre lucky flutter speed faster airplane capable achieving case youll never have flutter some techniques prevent flutter successful two common flutter-prevention tech niques work opposite ends problem easiest implement sealing gap tween control surface wing horizon tal stabilizer attacks aerodynamic driver flutter problem will cause flutter oc cur higher airspeed second fix 50 Model Aviation Radio Confrol Sport Aerobatics Ron Van Putte III Sleepr Oaks Rd Ft Walton Beach FL 32548 crease airplane speed flutter occursa Still have flutter must ready cure-all control surface static balance Its pretty works time What must move center mass control surface just front hinge line flutter will occur airspeed several ways statically balance control sur faces Figure 1 shows functionally accom plish ways implement problems static balancing youll probably have mechanism out breeze will snag things although have seen some really neat static balancing jobs hidden inside wing Figure 2 Figure 3 shows straightforward way bal ance control surface using common materials recommended ease installation struc tural integrity ability change weights What must get balance weight large enough cause control surface bare ly move up released neutral position Dont forget disconnect servo linkage first before course assumed control surface hinges nice free surface will flop down released no balance weights used Dont overdo static balancing elevators because can create another problem An overly bal anced elevator will tend move Up positive-U maneuvers like loops causes higher Us causes elevator move Up lifornia recently visiting Hughes Aircraft Company Canoga Park northwest Los Angeles Since Canoga Park decided take LR Taylor Power Pacer see could get repaired seems Power Pacer doesnt like have trans mitter pack plugged leads testing re ceiver pack Some bozo did just receiver side didnt work Fortu nately LR Taylor shop 20831 Roscoe Blvd Canoga Park CA 91306 two miles away Hughes complex able get after conducting business Hughes short order Power Pacer repaired recalibrated remainder hour long chat owner did talking must lonesome being cooped up nothing electronic gear talk day reason mentioned visit LR Taylor wasnt sure still business Id tried get some Power Pacers some guys club back order six eight months turned out source Id ordered hadnt bothered place order LR Taylor would never have come LR Taylor still business just have go right source Ever since wrote piece aileron differen tial February 1988 column have gotten several letters about Some requests information rest attempts show techniques obtain differ ential wouldnt work letters requesting information invariably about whether techniques Id de picted high-wing low-wing air planes Refer figures February column Figure 1 2 refer way get dif ferential low-wing airplane either bend ing aileron torque arms forward attach ing pushrods aileron servo wheel Continued page 160 Try Something Better Through years pushrods have made wiTh kinds mate rials some worked great others didnt Some prefer use simple piece piano wire change length temperature humid ity Others prefer glue smaiier pieces piano wIre iong strips wood messy Involved Dave Brown Products Fibergiass Pushrod System designed easy installation application tubes made fiberglass very high strength very little weight several end fittings pre-drilled regular V pushrods its never easier Ask dealer friend about Dave Brown Products Products friends recommend Order Number 5400-PRDS pushrod system indudes five end fitfngs Two drilled 1116 piano wire servo end Two drilled Kwik-Unk rods control surface end double drilled Kwik-Link rods Y type ptishrod anhedral dihedral stabs swept elevator hinge line DAVE BROWN PRODUCTS L56 Layhigh Rd Hamilton Ohio 45013 13 738-1576 May 1988 51 RC Electrics/Kopski Continued page 154 ted organization members wish promote fact Electrics fly well help new comers Electric endeavor good info came editor Current Flow Steve Moskal Steve can reached 30 S Ken sington Ave LaGrange IL 60525 tele phone number 312 354-2803 Interested mod elers might try giving Steve shout tell im Bob sent yal Andmy own best wishes EMF Oh woe unbounded griefl Another column endingwith much left pass along next month Happy silent landings everyone RC Aerobatics/Van Putte Continued page 51 aileron side wheel want get aileron differential high-wing airplane both techniques must re versed ie bend aileron torque arms back attach pushrods aileron servo wheel side opposite ailerons Doubting Thomas letter writers mailed copy Figure 4 shows what hap pens have equal servo output same both directions low-wing airplane can clearly see Up Down use both techniques youll get differential really surprised number letters received about design tips Id included March 1988 column uniformly en thusiastic support of same kind design ideas So next month Ill include some ideas proper design vertical fin tales about tails RC Pylon Racing/Hager Continued page 52 very consistent work up slowly towards prop speed Take time work fuel system including shutoff until works flawlessly Airplane balance control Another com mon mistake opinion fact people set up airplanes too sensitive controls Concentrate flying smoothly like tame airplane down desensitizing Kits controls Use enough get airplane Item around course Too much throw can get Thunder trouble make erratic flying Use QIt full travel joystick order get maximum resolution feel setup critical surface elevator China Make sure CG comes Out exactly mdi- Clipper cated plans Start off recommend- T-railed ed throws listed plans Fly airplane set throw elevator full stick trav el obtain turns radius slightly smaller 100 ft enough al- Spickler lows start pylon 2-3 turn slowly using maybe half stick travel around No 2 end up Texas Out going around No 3 stick bottomed out law always pull full Up elevator No 1 except first lap Stay same altitude around Scat Cat course Try climb dive too much Next like set ailerons up slow airplane would just barely roll twice going down straights gave full aileron throw set up rudder get minimum travel possible smallest servo output wheel using farthest hole control horn throw ends up too much fore takeoff end up using about V Right rudder travel stick closing want stress again pure speed what wins race Being consistent flying smooth tight wins race Thanks Tom rest list people compa nies sell Racing products list began April 1988 column Quickie 500 Manufact urer Phone Address Pauls Fly 619 743ing Stuff 5458 Paul Steinberg Model Tech California Speed Products PO Box 121 Escondido CA 92025 Hobby Stores 714 661- 32221 Alipaz #15 7430 San Juan Capistrano CA 92675 Hobby Stores Spickler Models Ritchs 713 661Hobbies 5458 Dick Ritch Flue Line Models 4104 Lark Houston TX 77025 Hobby Stores Continued page 162 install hinges hate Try Easy Hinges See Difference single slol s few drops C/A glue ssd its dsne No geuging pinning sr hinge pins wsrrs absuf Iscredibly strssg Virtually indeslructible 24 hinges 295 e e4 oa Za en INE PO Box 1743 Marcos CA 92069 flUe W fl1SiX V1W CWit fl5 LW ISUhuhIt ccie Ia m5uled Hal & mnd Lanai Wzdsgl j um _ntomrss 4 Power Only certified checks money orders accepsed Minimum order S1OO0to three packases 4 Powerpoles 5315 per pasfsage siCto shipping Sendlinat CT rnsidenfs add 75% sales tao Prices sabiect c5angenithosf notion DEALER iNQUiRIES INVITED farther information deale prices send SASh Basiness Card SERMOS RIC SNAP CONNECTORS Cedas Canes S Box 16787 Slanted CT 069203322-6294 160 Model Aviation qowsagSnrx zun IW Cussomlzed nawest German engInes noefrom vault Muffiw Mount MountIng Bolts y Presmirs Tap Smoke Carburetor LInkage CDI IgnltlonfCl4 EleclronloaL 48 Volt IgnitIon Pack Safety a0 Sitdi SIx-Bolt Hub ResIstor Spark Plugs Veer Wanenty Faulty Paresand WakmuultIp TaG MFG 857 High Mountain Rd North Haledon TO Law 200ulyRowhi Glese body wheel pant. end cowl P ft N5flO 51011 Poem wing al bale Included Sach 31 wllh points Included avahleblel Mw2pI--mn-i EDO FLOATS /a SCALE 46 LONG SEND $200 FOR COMPLETE CATALOG OF FINE KITS IKON NWST P0 Box 306 MA ~ PosI Falls ID 83854 yr 081 7739001
Edition: Model Aviation - 1988/05
Page Numbers: 50, 51, 160
PERIODICALLY read aircraft design arti cles about prevent control surface flutter cases suggestions good ideas use delaying onset phenomenon few actually work prevent ing flutter Before get subject further few things need clarified First classical sense what modelers usually call control surface flutter isnt flutter bMt con trol surface buzz Flutter engineers reserve word flutter describe oscillatory selfsustaining motion aircraft components involves interaction two modes component motion Control surface buzz volves mode aircraft component motion Big deal right flutter engineer distinction important because describes completely dif ferent mechanism interactions modelers distinction usually important because seldom observe classical flutter Flutter inherently destructive flutter speed aircraft components bend and/or twist sustained oscillations amplitudes neither decrease increase However once flutter speed exceeded oscillations grow ampli tude until something breaks otherwise changes relationships among affected aircraft components modern fighters must loaded external stores very carefully beFigure 1 Balancing control surface eliminates flutter Putting mechanism outside easiest drawbacks very pretty hardware can catch things Figure 2 Another way mass-balance control surface Neat hard make Elevator Horn Du-Bro EZ connectors Fishing Weight 1A6-in Music Wire 1As.in Wheel Collars Figure 3 Bowing inevitabledo easiest way Heres suggested set common materials use neat functional job statically balancing control surface trol surface buzz Im going turn around call control surface flutter anyway because thats what us call kind motion involves oscillatory rotation aileron elevator caused way hinge way move Since hinged front center mass surface behind hinge point often moved via torque rod en ters inboard end surface com bination two design features pro duces control surface flutter once have speed will have make control surface torque rod stiffer causes natural frequency aileron rotation increase causes flutter occur higher airspeed However suppose try both tech niques still have flutter thing else can done Yes few possible correctives like removing con trol surface replacing thick er leading edge trailing edge wing horizontal tail attached can also make trailing edge control surface blunt Both fixes also tend inBack February 1988 column author Van Putte suggested way get differential aileron travel bend aileron horn forward Some people felt would no good Ron drew sketch prove point radiuses arc R represent control horn position servo L gives equal Up Down inputs noticeable difference control horn travel between Neu tral position Up compared travel Neutral Down sketch illustrates aileron horn low-wing airplane cause thin flexible wings potential flut ter victims have observed case model flutter happened early version Sen ior Falcon original wing design much less rigid both bending torsion present wing aircraft went classi cal case wing bending/torsion flutter bot tom near-vertical dive right wing sepa rated aircraft about wing sheeting ended Senior Falcons dont fly too well littie half wing Now having pointed out control surface flutter isnt really flutter actually conNeutral Down UpNeutralDown Up flutter youre lucky flutter speed faster airplane capable achieving case youll never have flutter some techniques prevent flutter successful two common flutter-prevention tech niques work opposite ends problem easiest implement sealing gap tween control surface wing horizon tal stabilizer attacks aerodynamic driver flutter problem will cause flutter oc cur higher airspeed second fix 50 Model Aviation Radio Confrol Sport Aerobatics Ron Van Putte III Sleepr Oaks Rd Ft Walton Beach FL 32548 crease airplane speed flutter occursa Still have flutter must ready cure-all control surface static balance Its pretty works time What must move center mass control surface just front hinge line flutter will occur airspeed several ways statically balance control sur faces Figure 1 shows functionally accom plish ways implement problems static balancing youll probably have mechanism out breeze will snag things although have seen some really neat static balancing jobs hidden inside wing Figure 2 Figure 3 shows straightforward way bal ance control surface using common materials recommended ease installation struc tural integrity ability change weights What must get balance weight large enough cause control surface bare ly move up released neutral position Dont forget disconnect servo linkage first before course assumed control surface hinges nice free surface will flop down released no balance weights used Dont overdo static balancing elevators because can create another problem An overly bal anced elevator will tend move Up positive-U maneuvers like loops causes higher Us causes elevator move Up lifornia recently visiting Hughes Aircraft Company Canoga Park northwest Los Angeles Since Canoga Park decided take LR Taylor Power Pacer see could get repaired seems Power Pacer doesnt like have trans mitter pack plugged leads testing re ceiver pack Some bozo did just receiver side didnt work Fortu nately LR Taylor shop 20831 Roscoe Blvd Canoga Park CA 91306 two miles away Hughes complex able get after conducting business Hughes short order Power Pacer repaired recalibrated remainder hour long chat owner did talking must lonesome being cooped up nothing electronic gear talk day reason mentioned visit LR Taylor wasnt sure still business Id tried get some Power Pacers some guys club back order six eight months turned out source Id ordered hadnt bothered place order LR Taylor would never have come LR Taylor still business just have go right source Ever since wrote piece aileron differen tial February 1988 column have gotten several letters about Some requests information rest attempts show techniques obtain differ ential wouldnt work letters requesting information invariably about whether techniques Id de picted high-wing low-wing air planes Refer figures February column Figure 1 2 refer way get dif ferential low-wing airplane either bend ing aileron torque arms forward attach ing pushrods aileron servo wheel Continued page 160 Try Something Better Through years pushrods have made wiTh kinds mate rials some worked great others didnt Some prefer use simple piece piano wire change length temperature humid ity Others prefer glue smaiier pieces piano wIre iong strips wood messy Involved Dave Brown Products Fibergiass Pushrod System designed easy installation application tubes made fiberglass very high strength very little weight several end fittings pre-drilled regular V pushrods its never easier Ask dealer friend about Dave Brown Products Products friends recommend Order Number 5400-PRDS pushrod system indudes five end fitfngs Two drilled 1116 piano wire servo end Two drilled Kwik-Unk rods control surface end double drilled Kwik-Link rods Y type ptishrod anhedral dihedral stabs swept elevator hinge line DAVE BROWN PRODUCTS L56 Layhigh Rd Hamilton Ohio 45013 13 738-1576 May 1988 51 RC Electrics/Kopski Continued page 154 ted organization members wish promote fact Electrics fly well help new comers Electric endeavor good info came editor Current Flow Steve Moskal Steve can reached 30 S Ken sington Ave LaGrange IL 60525 tele phone number 312 354-2803 Interested mod elers might try giving Steve shout tell im Bob sent yal Andmy own best wishes EMF Oh woe unbounded griefl Another column endingwith much left pass along next month Happy silent landings everyone RC Aerobatics/Van Putte Continued page 51 aileron side wheel want get aileron differential high-wing airplane both techniques must re versed ie bend aileron torque arms back attach pushrods aileron servo wheel side opposite ailerons Doubting Thomas letter writers mailed copy Figure 4 shows what hap pens have equal servo output same both directions low-wing airplane can clearly see Up Down use both techniques youll get differential really surprised number letters received about design tips Id included March 1988 column uniformly en thusiastic support of same kind design ideas So next month Ill include some ideas proper design vertical fin tales about tails RC Pylon Racing/Hager Continued page 52 very consistent work up slowly towards prop speed Take time work fuel system including shutoff until works flawlessly Airplane balance control Another com mon mistake opinion fact people set up airplanes too sensitive controls Concentrate flying smoothly like tame airplane down desensitizing Kits controls Use enough get airplane Item around course Too much throw can get Thunder trouble make erratic flying Use QIt full travel joystick order get maximum resolution feel setup critical surface elevator China Make sure CG comes Out exactly mdi- Clipper cated plans Start off recommend- T-railed ed throws listed plans Fly airplane set throw elevator full stick trav el obtain turns radius slightly smaller 100 ft enough al- Spickler lows start pylon 2-3 turn slowly using maybe half stick travel around No 2 end up Texas Out going around No 3 stick bottomed out law always pull full Up elevator No 1 except first lap Stay same altitude around Scat Cat course Try climb dive too much Next like set ailerons up slow airplane would just barely roll twice going down straights gave full aileron throw set up rudder get minimum travel possible smallest servo output wheel using farthest hole control horn throw ends up too much fore takeoff end up using about V Right rudder travel stick closing want stress again pure speed what wins race Being consistent flying smooth tight wins race Thanks Tom rest list people compa nies sell Racing products list began April 1988 column Quickie 500 Manufact urer Phone Address Pauls Fly 619 743ing Stuff 5458 Paul Steinberg Model Tech California Speed Products PO Box 121 Escondido CA 92025 Hobby Stores 714 661- 32221 Alipaz #15 7430 San Juan Capistrano CA 92675 Hobby Stores Spickler Models Ritchs 713 661Hobbies 5458 Dick Ritch Flue Line Models 4104 Lark Houston TX 77025 Hobby Stores Continued page 162 install hinges hate Try Easy Hinges See Difference single slol s few drops C/A glue ssd its dsne No geuging pinning sr hinge pins wsrrs absuf Iscredibly strssg Virtually indeslructible 24 hinges 295 e e4 oa Za en INE PO Box 1743 Marcos CA 92069 flUe W fl1SiX V1W CWit fl5 LW ISUhuhIt ccie Ia m5uled Hal & mnd Lanai Wzdsgl j um _ntomrss 4 Power Only certified checks money orders accepsed Minimum order S1OO0to three packases 4 Powerpoles 5315 per pasfsage siCto shipping Sendlinat CT rnsidenfs add 75% sales tao Prices sabiect c5angenithosf notion DEALER iNQUiRIES INVITED farther information deale prices send SASh Basiness Card SERMOS RIC SNAP CONNECTORS Cedas Canes S Box 16787 Slanted CT 069203322-6294 160 Model Aviation qowsagSnrx zun IW Cussomlzed nawest German engInes noefrom vault Muffiw Mount MountIng Bolts y Presmirs Tap Smoke Carburetor LInkage CDI IgnltlonfCl4 EleclronloaL 48 Volt IgnitIon Pack Safety a0 Sitdi SIx-Bolt Hub ResIstor Spark Plugs Veer Wanenty Faulty Paresand WakmuultIp TaG MFG 857 High Mountain Rd North Haledon TO Law 200ulyRowhi Glese body wheel pant. end cowl P ft N5flO 51011 Poem wing al bale Included Sach 31 wllh points Included avahleblel Mw2pI--mn-i EDO FLOATS /a SCALE 46 LONG SEND $200 FOR COMPLETE CATALOG OF FINE KITS IKON NWST P0 Box 306 MA ~ PosI Falls ID 83854 yr 081 7739001