SUMMER INDOOR almost 30 years have hoping people would learn great fly Indoor during summer stead limiting cold weather other winter hassles rule As can see read ing Flying Opportunities section further months column summer Indoor bustin out over have preliminary information about programs may result increased site availability opportunities fly year-round works out Note important factor common summer sessions advance notice entry lists some cases list security other cases meet may cancelled little notice expected partici pants may have notified sure ex pected verify meet still being held before leave home Columbia University activity some time situation Columbia U has viewed pes simistically recent weeks may have turned around trial session mid-May works out several sessions will sched uled Write Dan Marek 210 West 10 1st St #10F New York NY 10025 phone 1212/222-1546 details about flying sched ule Once schedule has approved want fly contest spectator must furnish Social Security AMA num bers Gary Underwood 9 Treelawn Terrace Mercerville NJ 08619 tel 1-609/586-4441 least two weeks advance scheduled event Absolutely no will allowed building unless approved list Naval Air Station Hangar #1 former US home Hindenberg dirigible nearly 1000 ft long 250 ft diameter Ed has repaired better condition years largest han gars world schedule below will pretty busy months come Interested persons should contact ECIM get its access list discussed below par ticipants flying models must AMA members Nonlicensed spectators family members may attend registered Foreign nationals cur rent license national aero club may also participatebut must register allow extra time obtain clearance must list compiled Tom Vallee must notify Tom intention attend advance meet Changes NASA launch sched ules other possible events can preempt use audito rium much warning sure verify date Tom before leaving home Tom Val lee 444 Henryton So Laurel MD 20707 tel 1-301/498-0790 New Jersey Flying opportunities warranted available information section will become yearround featureinstead being supplemental announced previous column Idaho Kansas Lakehurst NJ activity Extensive activity Gary Underwood Dan Domina has resulted excellent relations between East Coast door Modelers ECIM officials Lakehurst Moscow Kibbie Dome Andy Tagliafico has set up three-day contest August 3-5 1990 Call Andy 1-503/371-0492 details Topeka Nonsanctioned Indoor meets Stone Hangar site June 10 July 8 August 12 Sep tember 9 October 14 1990 Jack Koehlar 3425 SW Arrow head Rd Topeka KS 666143485 tel 1-913/272-8439 Check Jack verify seasion especially weather questionable Aircraft must moved out hangar isnt allowed bad weather MarylandGreenbelt Goddard NASA Record Trials flying sessions have scheduled audi torium Building 8 Goddard Saturdays 1200 noon 1000 pm June 23 July 14 July 28 August 1 August 25 September 15 September 29 Oc tober 13 October 20 No vember 3 1990 NASA security requires attendees both US citizens AMA mem bers AMA license must available inspection gate contestants name Lakehurst NAS number Record Trials FAI Trials have set up Hangar #1 Record Trials June 16 August 29 September 16 October 7 1990 FAI Regional meets July 7-8 September 1-3 1990 Note must regis tered East Coast Indoor Modelers club advance event Contact Dan Domina 6 Meadow Lane East Windsor NJ 08520 tel 1-609/448-2840 Gary Underwood 9 Treelawn Terrace Mercerville NJ 08619 tel 1-609/586-4441 regis tration info Continued page 166 62 Model Aviation Free Flight Indoor Bud Tenny lox 545 Rkhardson TX 75080 plaster mold Stan Chiltons prop fixture ensures precise blade assemiby Chilton photo Vance C mini 0 seamy uuu trasimer demonstirnui Tom Vallee photo Note nonhelical pitch distribution Stans prop assembly fixture Chilton photo FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWEP 4 CH PLY FOAM AND BALSA WOOD KIT $6995 SEND $100 FOR CATALOGCA7RT 1 NEODESHA KS 66757 FREE SHIPPING ON KIT ORDERSscaA ASTERCARD OF SAC KITS AND ACC325-2821 motor first guess What happened reset trim shift CG keep al FF Indoor/Tenny to CG location can bet changed ready proven trim unless model balances exactly halfway be-Moving CG can done three ways Continued page 62tween front rear motor hooks 1 Add weight equal difference motor Flying typical example situation Nov-weights halfway between front rear motor New YorkLevittown Cantiaqueice Pennyplane Qops call Limited Pen- hooks lighter motors session Cantiaque Park Junenyplane now Without motor CG 2 Add just enough weight front rear 10 1990 800 am 500 pmfour inches front thrust bearinghook restore original CG Contact Richard Fiore 531 Seca-the center motor her back 3 special case new wing Lim togue Ave Farmingdale NYWith 23-in loop 0093-in-thick tan rubberited PP lighter old wing required 11735 tel 1-516/249-4358 forthe CG shifts rearward 04 doesntballast weight about 0008 oz enough act detailsseem like lot 8% wing chord Ifa movable ballast known weight such model has critically trimmed much required ballast easy make simple chart May 89 column asked shift balance can actually make unstable showing position ballast weight Indoor fliers Later AMA HQ releasedEven stability isnt compromised finelyeach motor weight figures showing approximately 450 AMAtuned cruise may deteriorate costing mm members flew rule book eventsutes duration long flightProp assembly fixture typical problem during period January 1-October 6 1989 Fixing problem another matter As theassembling all-wood props such used total contestants same report wasCG moved rearward point theEasy Bs Pennyplanes blade/spar alignless 9000out total AMA membershipmodel has neutral stability CG behindment its very difficult get blade over 100000this point model unstable becomes pro-lay flat against spar both cor What does mean Two things AMA obvi- gressively stable CG moved for- rect angle typical assembly fixture Stan ward amount balance point moves ex- Chilton made female plaster paris mold ously offers members something com-pressed percentage average winghis prop blocks places blade upside down petition Indoor fliers arent 05% minor-chord distance between CG thein mold locks place felt-covered ity Instead Indoor fliers really 5% minor-neutral point also called aerodynamic centerclamps can place spar top ity Thats 5% 9000 members flew inis called margin stabilityblade glue very accurately competitionEd Further survey MA future columns will see cornpute first photo shows close-up fixture Nats entries shows much higher percentagethe aerodynamic center model design us-with spar blade place Note hook alignof Indoor fliers RCers attend Nats other major events No matter much bad ing information properly possible lo- ment fixture left hook held exactly cate wing Indoor Duration models cor- vertical ensure correct repeatable blade asstuff hear about Indoor fliers doingrectly first trysembly black outline behind prop greatextra piece plastic used photo contrast AnSo changed weight rubber either loop other photo shows whole assembly Wheres CG center-of-gravity OK length rubber cross section both balanced model motor thought commonplace model balances ahead Heres gotcha first props Stan assembled would about right size could decide center motor heavier motor moves type fixture warped severely after being locate wing began fly- CG rearward lighter motor moves for- removed fixture problem ing you really needed bigger smaller pick ward can either repeat previous flight tests plaster paris hygroscopicit absorbs mois Serious Horsepower1 06 ST YS Rossi & WebraAvailable Parts Service YS Long & Short Stroke Custom Engines OS Long Stroke Accessories 0S 6IFSR Dave Shadel 0S 40 VRP/VF 0S 91 VRDF PerformanceSend $1 OOfor fully ST X -40 Specialtiesillustrated catalog Rossi 40 coming soon information Call 619 729-1658 Hours 10am 5pm Monday-Thursday P 0 Box 4003 sbad CA 92008 166 Model Aviation 10 SPAN 30-33 L65 50-75 Cli POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKIT$1995 TR 10 SPAN 19-22 LBS 35-42 CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 ture air So prop blades expanded during assembly warped moisture evaporated cure use thin plastic tween blade form Pennyplane evolution revisited last left Pennyplane Evolution saga deter mined high-drag problem probably caused thick wing During last flying session before building new wing test flights slightly lower pitch higher flaring prop yielded highest Category time ever model753 average rpm 186 OK rpm too high since about 820 time could expect rpm manage able piece rubber So new wing using same airfoil Jim Clems very successful model built same time wing planform changed ap proximately conform used Jim Clem wing constant chord tip panels swept back inch Want know what happened first flight under-elevated second flight trim almost right showed new wing drasti cally unloaded new flexible prop rpm soared 206 much lighter rubber flight 606 conservatively wound much ceiling scrubbing put ceiling scrubbing perspective dur ing same session Jim Clems model touched ceiling eight seconds remained ceiling until almost six minutes flight landing 938an exact tie record time currently held model What next higher pitch stiffer prop power used next flight wasnt close right combo last flight hung up breaking tail boom no time repatr before session ended least new wing success month between sessions pitch three props checked set hope better range Also boom rebuilt stronger adjustable inci dence stab last chance testing will final session scheduled before Nats/USIC John son City TN However flying time has saved test flying brand-new Intermedi ate Stick model built three weeks tween three PP props did well flex ible prop averaging 172 rpm 648 flight Flights #2 prop low-pitch lowcamber prop seen photo March 89 column conclusive hung twice first flight broke prop next Number 1 prop also photo stiffer #3 prop higher camber time flight 735 165 rpm Time ceiling 18 seconds still conservative hope need better prop/rubber match USIC no chances play Ill find out much learned successful mods Johnson City See New fun event Part Tom Vallees new fliertraining package shown another pho tos abbreviated rules Max wingspan 7 max chord 25 max length 10 mo tor stick 5 max stab area 50% wing area monoplane covering can anything except microfilm all-wood prop Special rules contests Toms living room Fly using AMA rules except three 10second steers permitted winding done kitchen top three flights living room 247 229 219 Pete Staehling did 721 MiniDome Johnson City Tom got 728 Lakehurst once got 426 living room Besides fun aspect Tom finds shoebox makes adequate carrying case model excellent making Indoor demonstra tions CL Aerobatics/McMiBan Continued page 69 engine dry hit starter off running inttial impression combination very smooth out question setup smoother running 60 thats whole story course Before releasing ship takeoff brought rpm up 10300 did sound fast Frank Williams just couldnt believe speedits dif ferent commented threw rod would take us out just turned needle little first flight impression heavy line tension plane turning laps 54 seconds Obviously speed plane related sound engine point also worthy comment Up close noise level actually quite reasonable seem ing less heavy sound 60 air higher rpm produces sound just what Im used sounds like Combat ship Good Well its going take getting used to reality tank setup seemed work quite well run equal whether ship upright inverted round maneuvers nice qualityunder control probably best way describe squares differ ent feel also Im quite sure whether point good engine didnt come way other setups increased turn rate us ing smaller prop evident plane could much better corner before feel triangle really nice After couple flights thinking pleasant experience apprehension about critical nature high technol ogy disappeared sound high-rev ving engine bit normal time look few changes started trim plane out heavy line tension proved present flight elevations below 450 softer top circle Also after about five flights seen some engine runs exactly tune al though setting same rpm takeoff having reset needle flight As engine didnt have much running time wasnt concerned air did see some flights en gine seemed fall off cam point very subtle really noticeable effect up top Id told change length pipe note effect engines characteris tics latest feedback pointing pipe length 17-17 V-Max 46 So flipped plane its back pulled pipe back out its coupler bit Evaluating oper ation showed needle valve needed set richer shortened flight duration indicated fuel consumption power up Something else showed up ten dency off pipe flight flight same rpm setting ground maneuvers run anything consistent wind up 12-15 mph now wasnt tendency plane wind up going through maneuvers al though because high rpm expected SPECIALISTS INCUS TOM COX TEE DEE& REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM& STOCK PARTS VAILABLE INDIWDUALL V COMPETITIONACCESSORIES RACING WHEELS KLOTZOIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRA NDS OFGLOWPL UGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STIlT SPARKPLUGS SILK8 COLORS QUALITYDOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER P0 WER KITS PROPS TISSUEAND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS August 1990 167 VERA GES 0 VER 9000 PROPS I! IMMEDIA TESHIPMENTON VISA/MC turn tour pnoter airfoil plotter wth FOILED AGAIN! C PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE o PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY VIA INTELLIGENr EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES l5PAGE ILLUSTRATED USER MANUAL $4500 000 pbs00 00000f/I lnimaUnf Sank dm us$00 /-z.. $ ~-0 0 000100 iOMPCtXT*T COmpoOblO - nmp0 mO dot 00010 pun 0000500 pin0 two nsa nudaulno spcIy 520 003 4000 SOn C5On 00000 00O tO CYGNET Software714 496-6961 24843 Del Prado #141B Dana Point CA 92629 THE BEST FUSELAGE JIG EVER PERIOD Provides Solid Support Accurate Building Rugged Construction 7 Ply Aircraft Plywood Provides Lifetime Use Two Sizes Available Regular Fuselages Up 6 Wide Jumbo Fuselages Up 9 Wide Use Own Building Board Work Bench Base Mount Jig Station Uni-Strut Guide Rails Most Versatile Set-Up Contains Complete Hardware Instructions Including Uni-Strut Information Box 4 Standard Jig Stations 52795 Box 4 Jumbo Jig Stations 1995 TwoS ft long Guide Rails including mounting nuts 2195 IVANS MAGIC GADGET protractor device used Ivan Kristensen accurately measure aileron elevator rudder throw Takes guess work out trimming out airplane quality tool complete instructions log book carrying case1795 PLUG-IN ADJUSTABLE STAB KIT last can optimize stab incidence best flight charac teristics pair glass filled nylon adjusters included provide micro screw adjustment smaller front tube Main tube aluminum matching phenolic socket S695 Include 52 SOlitem UPS esidents Add 6% Sales Tat GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 1 476-8639 PLUG-IN WING ADJUSTER KIT Four glass filled nylon brackets included key wing panels front rear allow accurately adjust panel straight flight Complete hardware & instructions5995 WING TUBE & SOOETS Aluminum alloy tubing plug-in wings Included pair special slip-fit phenolic sockets build wing structure Now size models 718 diax2S 595 Ii dias25 995 11/zdias3S1495 did notice certain maneuvers such Vertical Eight Overhead Eight routine first figure obtained plane would suddenly come out top suc ceeding duplicate maneuver analysis problem time engine dropped off power Well observations after 16 flights Im going continue working combination get familiar setup Theres no question about now understanding what fliers perceiving advantages However Ill need air time before can feel know about pipe will react believe advantages will accrue good pipe combination can get workable setup quickly using known numbers Ill another column fall latest technology Tech tip days so-called bulletproof controls arrow-shaft pushrods norm solving flexing controls other things start show up work way through doing installation Space concern now hack up pristine interior fuselage worry couple things can First its always better plan before cut wood make no guarantee follow premise Take good look plans lay out travel flap-to-elevator pushrod De velop patterns formers consider following need anything just barest outline clear arrow shaft pushrod stiff arrow shaft answer dont So keep thought lets look make formers standard procedure making fuselage formers used to use %-in cross-grained balsa pushrod braces added necessary satisfactory cut out middle isnt much strength left basic approach going employ laminate wood grain layers crossed 30 angle can use either two laminations /16 %2 balsa /32 plywood Using patterns rough out shapes sheets wood point will need flat surface like some plate glass com plete laminating process Take some slow setting CyA glue outline rough formers Place part glue face up glass put other piece top grain desired cross angle Apply heavy pressure until glue kicks now have very stiff former thats ready final trimming Hit jigsaw trim finish up outline sandpaper Ive performed measurements gram scale can barely detect difference weight between laminated part %-in sheet former same shape CL Scale/Boss Continued page 70 largest size repeat test might waste bit wire its cheap price pay model will function properly ground competition maintain highest possi ble score ground handling operations forming main landing gear wire take care see axles line wheels should track exactly fore aft track toward outside flight circle model will have tendency skid along circle dur ing taxi track toward inside cir cle model will tend turn circle causing loss tension line allowing model roll free could highly dan gerous tail wheel conventional gear nose wheel tricycle gear also plays significant role models ground handling behavior strut tail wheel must made wire thick enough keep wheel hitting fuselage during landings model has tricy cle gear make nose wheel strut same size wire main landing gear tail wheels nose wheels also contribute well model will track moving ground Should tail wheel installed fixed position made swivel adjustable Some modelers install full-swiveling tail wheel eliminate models skidding during taxi theory concept may correct actual practice another thing tail wheel should deflected small stone other de bris during initial taxi phase before centrifu gal force can help keep model out lines model could turn circle freely swiveling tail wheel certainly op tion fixed adjustable type would provide greater degree control model safety Gerry Deneau indicated solution tail wheel question make adjustable mounted steering arms tail gear con nected pushrods pushrods extend forward plate bolts secure arrangement will allow tail wheel held desired position series taxi tests will help determine position provides best * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202Air Cleaner Fine Replacement Inserts Cat No 104 Pkl2 Inserts Coarse Cat No 204 Pk/2 Inserts Fine $275 $275 $239 $239 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc PO Box 3786 center Line Michigan 48015 lAdd $250 shipping igan residents add 4% salca taxi IG3tS A monthly publication covering International RC Soaring Scene USA $17 yr $22/yr 1st Class Canada/Mexico $22/yr US funds Asia & Pacific $28/yr US funds Europe & UK $28/yr US funds Surface Mail Foreign $19/yr US funds RIC SOARING DIGEST PO Box 6680 Concord CA 94524 168 Model Aviation
Edition: Model Aviation - 1990/08
Page Numbers: 62, 166, 167, 168
SUMMER INDOOR almost 30 years have hoping people would learn great fly Indoor during summer stead limiting cold weather other winter hassles rule As can see read ing Flying Opportunities section further months column summer Indoor bustin out over have preliminary information about programs may result increased site availability opportunities fly year-round works out Note important factor common summer sessions advance notice entry lists some cases list security other cases meet may cancelled little notice expected partici pants may have notified sure ex pected verify meet still being held before leave home Columbia University activity some time situation Columbia U has viewed pes simistically recent weeks may have turned around trial session mid-May works out several sessions will sched uled Write Dan Marek 210 West 10 1st St #10F New York NY 10025 phone 1212/222-1546 details about flying sched ule Once schedule has approved want fly contest spectator must furnish Social Security AMA num bers Gary Underwood 9 Treelawn Terrace Mercerville NJ 08619 tel 1-609/586-4441 least two weeks advance scheduled event Absolutely no will allowed building unless approved list Naval Air Station Hangar #1 former US home Hindenberg dirigible nearly 1000 ft long 250 ft diameter Ed has repaired better condition years largest han gars world schedule below will pretty busy months come Interested persons should contact ECIM get its access list discussed below par ticipants flying models must AMA members Nonlicensed spectators family members may attend registered Foreign nationals cur rent license national aero club may also participatebut must register allow extra time obtain clearance must list compiled Tom Vallee must notify Tom intention attend advance meet Changes NASA launch sched ules other possible events can preempt use audito rium much warning sure verify date Tom before leaving home Tom Val lee 444 Henryton So Laurel MD 20707 tel 1-301/498-0790 New Jersey Flying opportunities warranted available information section will become yearround featureinstead being supplemental announced previous column Idaho Kansas Lakehurst NJ activity Extensive activity Gary Underwood Dan Domina has resulted excellent relations between East Coast door Modelers ECIM officials Lakehurst Moscow Kibbie Dome Andy Tagliafico has set up three-day contest August 3-5 1990 Call Andy 1-503/371-0492 details Topeka Nonsanctioned Indoor meets Stone Hangar site June 10 July 8 August 12 Sep tember 9 October 14 1990 Jack Koehlar 3425 SW Arrow head Rd Topeka KS 666143485 tel 1-913/272-8439 Check Jack verify seasion especially weather questionable Aircraft must moved out hangar isnt allowed bad weather MarylandGreenbelt Goddard NASA Record Trials flying sessions have scheduled audi torium Building 8 Goddard Saturdays 1200 noon 1000 pm June 23 July 14 July 28 August 1 August 25 September 15 September 29 Oc tober 13 October 20 No vember 3 1990 NASA security requires attendees both US citizens AMA mem bers AMA license must available inspection gate contestants name Lakehurst NAS number Record Trials FAI Trials have set up Hangar #1 Record Trials June 16 August 29 September 16 October 7 1990 FAI Regional meets July 7-8 September 1-3 1990 Note must regis tered East Coast Indoor Modelers club advance event Contact Dan Domina 6 Meadow Lane East Windsor NJ 08520 tel 1-609/448-2840 Gary Underwood 9 Treelawn Terrace Mercerville NJ 08619 tel 1-609/586-4441 regis tration info Continued page 166 62 Model Aviation Free Flight Indoor Bud Tenny lox 545 Rkhardson TX 75080 plaster mold Stan Chiltons prop fixture ensures precise blade assemiby Chilton photo Vance C mini 0 seamy uuu trasimer demonstirnui Tom Vallee photo Note nonhelical pitch distribution Stans prop assembly fixture Chilton photo FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWEP 4 CH PLY FOAM AND BALSA WOOD KIT $6995 SEND $100 FOR CATALOGCA7RT 1 NEODESHA KS 66757 FREE SHIPPING ON KIT ORDERSscaA ASTERCARD OF SAC KITS AND ACC325-2821 motor first guess What happened reset trim shift CG keep al FF Indoor/Tenny to CG location can bet changed ready proven trim unless model balances exactly halfway be-Moving CG can done three ways Continued page 62tween front rear motor hooks 1 Add weight equal difference motor Flying typical example situation Nov-weights halfway between front rear motor New YorkLevittown Cantiaqueice Pennyplane Qops call Limited Pen- hooks lighter motors session Cantiaque Park Junenyplane now Without motor CG 2 Add just enough weight front rear 10 1990 800 am 500 pmfour inches front thrust bearinghook restore original CG Contact Richard Fiore 531 Seca-the center motor her back 3 special case new wing Lim togue Ave Farmingdale NYWith 23-in loop 0093-in-thick tan rubberited PP lighter old wing required 11735 tel 1-516/249-4358 forthe CG shifts rearward 04 doesntballast weight about 0008 oz enough act detailsseem like lot 8% wing chord Ifa movable ballast known weight such model has critically trimmed much required ballast easy make simple chart May 89 column asked shift balance can actually make unstable showing position ballast weight Indoor fliers Later AMA HQ releasedEven stability isnt compromised finelyeach motor weight figures showing approximately 450 AMAtuned cruise may deteriorate costing mm members flew rule book eventsutes duration long flightProp assembly fixture typical problem during period January 1-October 6 1989 Fixing problem another matter As theassembling all-wood props such used total contestants same report wasCG moved rearward point theEasy Bs Pennyplanes blade/spar alignless 9000out total AMA membershipmodel has neutral stability CG behindment its very difficult get blade over 100000this point model unstable becomes pro-lay flat against spar both cor What does mean Two things AMA obvi- gressively stable CG moved for- rect angle typical assembly fixture Stan ward amount balance point moves ex- Chilton made female plaster paris mold ously offers members something com-pressed percentage average winghis prop blocks places blade upside down petition Indoor fliers arent 05% minor-chord distance between CG thein mold locks place felt-covered ity Instead Indoor fliers really 5% minor-neutral point also called aerodynamic centerclamps can place spar top ity Thats 5% 9000 members flew inis called margin stabilityblade glue very accurately competitionEd Further survey MA future columns will see cornpute first photo shows close-up fixture Nats entries shows much higher percentagethe aerodynamic center model design us-with spar blade place Note hook alignof Indoor fliers RCers attend Nats other major events No matter much bad ing information properly possible lo- ment fixture left hook held exactly cate wing Indoor Duration models cor- vertical ensure correct repeatable blade asstuff hear about Indoor fliers doingrectly first trysembly black outline behind prop greatextra piece plastic used photo contrast AnSo changed weight rubber either loop other photo shows whole assembly Wheres CG center-of-gravity OK length rubber cross section both balanced model motor thought commonplace model balances ahead Heres gotcha first props Stan assembled would about right size could decide center motor heavier motor moves type fixture warped severely after being locate wing began fly- CG rearward lighter motor moves for- removed fixture problem ing you really needed bigger smaller pick ward can either repeat previous flight tests plaster paris hygroscopicit absorbs mois Serious Horsepower1 06 ST YS Rossi & WebraAvailable Parts Service YS Long & Short Stroke Custom Engines OS Long Stroke Accessories 0S 6IFSR Dave Shadel 0S 40 VRP/VF 0S 91 VRDF PerformanceSend $1 OOfor fully ST X -40 Specialtiesillustrated catalog Rossi 40 coming soon information Call 619 729-1658 Hours 10am 5pm Monday-Thursday P 0 Box 4003 sbad CA 92008 166 Model Aviation 10 SPAN 30-33 L65 50-75 Cli POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKIT$1995 TR 10 SPAN 19-22 LBS 35-42 CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 ture air So prop blades expanded during assembly warped moisture evaporated cure use thin plastic tween blade form Pennyplane evolution revisited last left Pennyplane Evolution saga deter mined high-drag problem probably caused thick wing During last flying session before building new wing test flights slightly lower pitch higher flaring prop yielded highest Category time ever model753 average rpm 186 OK rpm too high since about 820 time could expect rpm manage able piece rubber So new wing using same airfoil Jim Clems very successful model built same time wing planform changed ap proximately conform used Jim Clem wing constant chord tip panels swept back inch Want know what happened first flight under-elevated second flight trim almost right showed new wing drasti cally unloaded new flexible prop rpm soared 206 much lighter rubber flight 606 conservatively wound much ceiling scrubbing put ceiling scrubbing perspective dur ing same session Jim Clems model touched ceiling eight seconds remained ceiling until almost six minutes flight landing 938an exact tie record time currently held model What next higher pitch stiffer prop power used next flight wasnt close right combo last flight hung up breaking tail boom no time repatr before session ended least new wing success month between sessions pitch three props checked set hope better range Also boom rebuilt stronger adjustable inci dence stab last chance testing will final session scheduled before Nats/USIC John son City TN However flying time has saved test flying brand-new Intermedi ate Stick model built three weeks tween three PP props did well flex ible prop averaging 172 rpm 648 flight Flights #2 prop low-pitch lowcamber prop seen photo March 89 column conclusive hung twice first flight broke prop next Number 1 prop also photo stiffer #3 prop higher camber time flight 735 165 rpm Time ceiling 18 seconds still conservative hope need better prop/rubber match USIC no chances play Ill find out much learned successful mods Johnson City See New fun event Part Tom Vallees new fliertraining package shown another pho tos abbreviated rules Max wingspan 7 max chord 25 max length 10 mo tor stick 5 max stab area 50% wing area monoplane covering can anything except microfilm all-wood prop Special rules contests Toms living room Fly using AMA rules except three 10second steers permitted winding done kitchen top three flights living room 247 229 219 Pete Staehling did 721 MiniDome Johnson City Tom got 728 Lakehurst once got 426 living room Besides fun aspect Tom finds shoebox makes adequate carrying case model excellent making Indoor demonstra tions CL Aerobatics/McMiBan Continued page 69 engine dry hit starter off running inttial impression combination very smooth out question setup smoother running 60 thats whole story course Before releasing ship takeoff brought rpm up 10300 did sound fast Frank Williams just couldnt believe speedits dif ferent commented threw rod would take us out just turned needle little first flight impression heavy line tension plane turning laps 54 seconds Obviously speed plane related sound engine point also worthy comment Up close noise level actually quite reasonable seem ing less heavy sound 60 air higher rpm produces sound just what Im used sounds like Combat ship Good Well its going take getting used to reality tank setup seemed work quite well run equal whether ship upright inverted round maneuvers nice qualityunder control probably best way describe squares differ ent feel also Im quite sure whether point good engine didnt come way other setups increased turn rate us ing smaller prop evident plane could much better corner before feel triangle really nice After couple flights thinking pleasant experience apprehension about critical nature high technol ogy disappeared sound high-rev ving engine bit normal time look few changes started trim plane out heavy line tension proved present flight elevations below 450 softer top circle Also after about five flights seen some engine runs exactly tune al though setting same rpm takeoff having reset needle flight As engine didnt have much running time wasnt concerned air did see some flights en gine seemed fall off cam point very subtle really noticeable effect up top Id told change length pipe note effect engines characteris tics latest feedback pointing pipe length 17-17 V-Max 46 So flipped plane its back pulled pipe back out its coupler bit Evaluating oper ation showed needle valve needed set richer shortened flight duration indicated fuel consumption power up Something else showed up ten dency off pipe flight flight same rpm setting ground maneuvers run anything consistent wind up 12-15 mph now wasnt tendency plane wind up going through maneuvers al though because high rpm expected SPECIALISTS INCUS TOM COX TEE DEE& REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM& STOCK PARTS VAILABLE INDIWDUALL V COMPETITIONACCESSORIES RACING WHEELS KLOTZOIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRA NDS OFGLOWPL UGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STIlT SPARKPLUGS SILK8 COLORS QUALITYDOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER P0 WER KITS PROPS TISSUEAND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS August 1990 167 VERA GES 0 VER 9000 PROPS I! IMMEDIA TESHIPMENTON VISA/MC turn tour pnoter airfoil plotter wth FOILED AGAIN! C PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE o PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY VIA INTELLIGENr EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES l5PAGE ILLUSTRATED USER MANUAL $4500 000 pbs00 00000f/I lnimaUnf Sank dm us$00 /-z.. $ ~-0 0 000100 iOMPCtXT*T COmpoOblO - nmp0 mO dot 00010 pun 0000500 pin0 two nsa nudaulno spcIy 520 003 4000 SOn C5On 00000 00O tO CYGNET Software714 496-6961 24843 Del Prado #141B Dana Point CA 92629 THE BEST FUSELAGE JIG EVER PERIOD Provides Solid Support Accurate Building Rugged Construction 7 Ply Aircraft Plywood Provides Lifetime Use Two Sizes Available Regular Fuselages Up 6 Wide Jumbo Fuselages Up 9 Wide Use Own Building Board Work Bench Base Mount Jig Station Uni-Strut Guide Rails Most Versatile Set-Up Contains Complete Hardware Instructions Including Uni-Strut Information Box 4 Standard Jig Stations 52795 Box 4 Jumbo Jig Stations 1995 TwoS ft long Guide Rails including mounting nuts 2195 IVANS MAGIC GADGET protractor device used Ivan Kristensen accurately measure aileron elevator rudder throw Takes guess work out trimming out airplane quality tool complete instructions log book carrying case1795 PLUG-IN ADJUSTABLE STAB KIT last can optimize stab incidence best flight charac teristics pair glass filled nylon adjusters included provide micro screw adjustment smaller front tube Main tube aluminum matching phenolic socket S695 Include 52 SOlitem UPS esidents Add 6% Sales Tat GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 1 476-8639 PLUG-IN WING ADJUSTER KIT Four glass filled nylon brackets included key wing panels front rear allow accurately adjust panel straight flight Complete hardware & instructions5995 WING TUBE & SOOETS Aluminum alloy tubing plug-in wings Included pair special slip-fit phenolic sockets build wing structure Now size models 718 diax2S 595 Ii dias25 995 11/zdias3S1495 did notice certain maneuvers such Vertical Eight Overhead Eight routine first figure obtained plane would suddenly come out top suc ceeding duplicate maneuver analysis problem time engine dropped off power Well observations after 16 flights Im going continue working combination get familiar setup Theres no question about now understanding what fliers perceiving advantages However Ill need air time before can feel know about pipe will react believe advantages will accrue good pipe combination can get workable setup quickly using known numbers Ill another column fall latest technology Tech tip days so-called bulletproof controls arrow-shaft pushrods norm solving flexing controls other things start show up work way through doing installation Space concern now hack up pristine interior fuselage worry couple things can First its always better plan before cut wood make no guarantee follow premise Take good look plans lay out travel flap-to-elevator pushrod De velop patterns formers consider following need anything just barest outline clear arrow shaft pushrod stiff arrow shaft answer dont So keep thought lets look make formers standard procedure making fuselage formers used to use %-in cross-grained balsa pushrod braces added necessary satisfactory cut out middle isnt much strength left basic approach going employ laminate wood grain layers crossed 30 angle can use either two laminations /16 %2 balsa /32 plywood Using patterns rough out shapes sheets wood point will need flat surface like some plate glass com plete laminating process Take some slow setting CyA glue outline rough formers Place part glue face up glass put other piece top grain desired cross angle Apply heavy pressure until glue kicks now have very stiff former thats ready final trimming Hit jigsaw trim finish up outline sandpaper Ive performed measurements gram scale can barely detect difference weight between laminated part %-in sheet former same shape CL Scale/Boss Continued page 70 largest size repeat test might waste bit wire its cheap price pay model will function properly ground competition maintain highest possi ble score ground handling operations forming main landing gear wire take care see axles line wheels should track exactly fore aft track toward outside flight circle model will have tendency skid along circle dur ing taxi track toward inside cir cle model will tend turn circle causing loss tension line allowing model roll free could highly dan gerous tail wheel conventional gear nose wheel tricycle gear also plays significant role models ground handling behavior strut tail wheel must made wire thick enough keep wheel hitting fuselage during landings model has tricy cle gear make nose wheel strut same size wire main landing gear tail wheels nose wheels also contribute well model will track moving ground Should tail wheel installed fixed position made swivel adjustable Some modelers install full-swiveling tail wheel eliminate models skidding during taxi theory concept may correct actual practice another thing tail wheel should deflected small stone other de bris during initial taxi phase before centrifu gal force can help keep model out lines model could turn circle freely swiveling tail wheel certainly op tion fixed adjustable type would provide greater degree control model safety Gerry Deneau indicated solution tail wheel question make adjustable mounted steering arms tail gear con nected pushrods pushrods extend forward plate bolts secure arrangement will allow tail wheel held desired position series taxi tests will help determine position provides best * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202Air Cleaner Fine Replacement Inserts Cat No 104 Pkl2 Inserts Coarse Cat No 204 Pk/2 Inserts Fine $275 $275 $239 $239 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc PO Box 3786 center Line Michigan 48015 lAdd $250 shipping igan residents add 4% salca taxi IG3tS A monthly publication covering International RC Soaring Scene USA $17 yr $22/yr 1st Class Canada/Mexico $22/yr US funds Asia & Pacific $28/yr US funds Europe & UK $28/yr US funds Surface Mail Foreign $19/yr US funds RIC SOARING DIGEST PO Box 6680 Concord CA 94524 168 Model Aviation
Edition: Model Aviation - 1990/08
Page Numbers: 62, 166, 167, 168
SUMMER INDOOR almost 30 years have hoping people would learn great fly Indoor during summer stead limiting cold weather other winter hassles rule As can see read ing Flying Opportunities section further months column summer Indoor bustin out over have preliminary information about programs may result increased site availability opportunities fly year-round works out Note important factor common summer sessions advance notice entry lists some cases list security other cases meet may cancelled little notice expected partici pants may have notified sure ex pected verify meet still being held before leave home Columbia University activity some time situation Columbia U has viewed pes simistically recent weeks may have turned around trial session mid-May works out several sessions will sched uled Write Dan Marek 210 West 10 1st St #10F New York NY 10025 phone 1212/222-1546 details about flying sched ule Once schedule has approved want fly contest spectator must furnish Social Security AMA num bers Gary Underwood 9 Treelawn Terrace Mercerville NJ 08619 tel 1-609/586-4441 least two weeks advance scheduled event Absolutely no will allowed building unless approved list Naval Air Station Hangar #1 former US home Hindenberg dirigible nearly 1000 ft long 250 ft diameter Ed has repaired better condition years largest han gars world schedule below will pretty busy months come Interested persons should contact ECIM get its access list discussed below par ticipants flying models must AMA members Nonlicensed spectators family members may attend registered Foreign nationals cur rent license national aero club may also participatebut must register allow extra time obtain clearance must list compiled Tom Vallee must notify Tom intention attend advance meet Changes NASA launch sched ules other possible events can preempt use audito rium much warning sure verify date Tom before leaving home Tom Val lee 444 Henryton So Laurel MD 20707 tel 1-301/498-0790 New Jersey Flying opportunities warranted available information section will become yearround featureinstead being supplemental announced previous column Idaho Kansas Lakehurst NJ activity Extensive activity Gary Underwood Dan Domina has resulted excellent relations between East Coast door Modelers ECIM officials Lakehurst Moscow Kibbie Dome Andy Tagliafico has set up three-day contest August 3-5 1990 Call Andy 1-503/371-0492 details Topeka Nonsanctioned Indoor meets Stone Hangar site June 10 July 8 August 12 Sep tember 9 October 14 1990 Jack Koehlar 3425 SW Arrow head Rd Topeka KS 666143485 tel 1-913/272-8439 Check Jack verify seasion especially weather questionable Aircraft must moved out hangar isnt allowed bad weather MarylandGreenbelt Goddard NASA Record Trials flying sessions have scheduled audi torium Building 8 Goddard Saturdays 1200 noon 1000 pm June 23 July 14 July 28 August 1 August 25 September 15 September 29 Oc tober 13 October 20 No vember 3 1990 NASA security requires attendees both US citizens AMA mem bers AMA license must available inspection gate contestants name Lakehurst NAS number Record Trials FAI Trials have set up Hangar #1 Record Trials June 16 August 29 September 16 October 7 1990 FAI Regional meets July 7-8 September 1-3 1990 Note must regis tered East Coast Indoor Modelers club advance event Contact Dan Domina 6 Meadow Lane East Windsor NJ 08520 tel 1-609/448-2840 Gary Underwood 9 Treelawn Terrace Mercerville NJ 08619 tel 1-609/586-4441 regis tration info Continued page 166 62 Model Aviation Free Flight Indoor Bud Tenny lox 545 Rkhardson TX 75080 plaster mold Stan Chiltons prop fixture ensures precise blade assemiby Chilton photo Vance C mini 0 seamy uuu trasimer demonstirnui Tom Vallee photo Note nonhelical pitch distribution Stans prop assembly fixture Chilton photo FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWEP 4 CH PLY FOAM AND BALSA WOOD KIT $6995 SEND $100 FOR CATALOGCA7RT 1 NEODESHA KS 66757 FREE SHIPPING ON KIT ORDERSscaA ASTERCARD OF SAC KITS AND ACC325-2821 motor first guess What happened reset trim shift CG keep al FF Indoor/Tenny to CG location can bet changed ready proven trim unless model balances exactly halfway be-Moving CG can done three ways Continued page 62tween front rear motor hooks 1 Add weight equal difference motor Flying typical example situation Nov-weights halfway between front rear motor New YorkLevittown Cantiaqueice Pennyplane Qops call Limited Pen- hooks lighter motors session Cantiaque Park Junenyplane now Without motor CG 2 Add just enough weight front rear 10 1990 800 am 500 pmfour inches front thrust bearinghook restore original CG Contact Richard Fiore 531 Seca-the center motor her back 3 special case new wing Lim togue Ave Farmingdale NYWith 23-in loop 0093-in-thick tan rubberited PP lighter old wing required 11735 tel 1-516/249-4358 forthe CG shifts rearward 04 doesntballast weight about 0008 oz enough act detailsseem like lot 8% wing chord Ifa movable ballast known weight such model has critically trimmed much required ballast easy make simple chart May 89 column asked shift balance can actually make unstable showing position ballast weight Indoor fliers Later AMA HQ releasedEven stability isnt compromised finelyeach motor weight figures showing approximately 450 AMAtuned cruise may deteriorate costing mm members flew rule book eventsutes duration long flightProp assembly fixture typical problem during period January 1-October 6 1989 Fixing problem another matter As theassembling all-wood props such used total contestants same report wasCG moved rearward point theEasy Bs Pennyplanes blade/spar alignless 9000out total AMA membershipmodel has neutral stability CG behindment its very difficult get blade over 100000this point model unstable becomes pro-lay flat against spar both cor What does mean Two things AMA obvi- gressively stable CG moved for- rect angle typical assembly fixture Stan ward amount balance point moves ex- Chilton made female plaster paris mold ously offers members something com-pressed percentage average winghis prop blocks places blade upside down petition Indoor fliers arent 05% minor-chord distance between CG thein mold locks place felt-covered ity Instead Indoor fliers really 5% minor-neutral point also called aerodynamic centerclamps can place spar top ity Thats 5% 9000 members flew inis called margin stabilityblade glue very accurately competitionEd Further survey MA future columns will see cornpute first photo shows close-up fixture Nats entries shows much higher percentagethe aerodynamic center model design us-with spar blade place Note hook alignof Indoor fliers RCers attend Nats other major events No matter much bad ing information properly possible lo- ment fixture left hook held exactly cate wing Indoor Duration models cor- vertical ensure correct repeatable blade asstuff hear about Indoor fliers doingrectly first trysembly black outline behind prop greatextra piece plastic used photo contrast AnSo changed weight rubber either loop other photo shows whole assembly Wheres CG center-of-gravity OK length rubber cross section both balanced model motor thought commonplace model balances ahead Heres gotcha first props Stan assembled would about right size could decide center motor heavier motor moves type fixture warped severely after being locate wing began fly- CG rearward lighter motor moves for- removed fixture problem ing you really needed bigger smaller pick ward can either repeat previous flight tests plaster paris hygroscopicit absorbs mois Serious Horsepower1 06 ST YS Rossi & WebraAvailable Parts Service YS Long & Short Stroke Custom Engines OS Long Stroke Accessories 0S 6IFSR Dave Shadel 0S 40 VRP/VF 0S 91 VRDF PerformanceSend $1 OOfor fully ST X -40 Specialtiesillustrated catalog Rossi 40 coming soon information Call 619 729-1658 Hours 10am 5pm Monday-Thursday P 0 Box 4003 sbad CA 92008 166 Model Aviation 10 SPAN 30-33 L65 50-75 Cli POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKIT$1995 TR 10 SPAN 19-22 LBS 35-42 CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 ture air So prop blades expanded during assembly warped moisture evaporated cure use thin plastic tween blade form Pennyplane evolution revisited last left Pennyplane Evolution saga deter mined high-drag problem probably caused thick wing During last flying session before building new wing test flights slightly lower pitch higher flaring prop yielded highest Category time ever model753 average rpm 186 OK rpm too high since about 820 time could expect rpm manage able piece rubber So new wing using same airfoil Jim Clems very successful model built same time wing planform changed ap proximately conform used Jim Clem wing constant chord tip panels swept back inch Want know what happened first flight under-elevated second flight trim almost right showed new wing drasti cally unloaded new flexible prop rpm soared 206 much lighter rubber flight 606 conservatively wound much ceiling scrubbing put ceiling scrubbing perspective dur ing same session Jim Clems model touched ceiling eight seconds remained ceiling until almost six minutes flight landing 938an exact tie record time currently held model What next higher pitch stiffer prop power used next flight wasnt close right combo last flight hung up breaking tail boom no time repatr before session ended least new wing success month between sessions pitch three props checked set hope better range Also boom rebuilt stronger adjustable inci dence stab last chance testing will final session scheduled before Nats/USIC John son City TN However flying time has saved test flying brand-new Intermedi ate Stick model built three weeks tween three PP props did well flex ible prop averaging 172 rpm 648 flight Flights #2 prop low-pitch lowcamber prop seen photo March 89 column conclusive hung twice first flight broke prop next Number 1 prop also photo stiffer #3 prop higher camber time flight 735 165 rpm Time ceiling 18 seconds still conservative hope need better prop/rubber match USIC no chances play Ill find out much learned successful mods Johnson City See New fun event Part Tom Vallees new fliertraining package shown another pho tos abbreviated rules Max wingspan 7 max chord 25 max length 10 mo tor stick 5 max stab area 50% wing area monoplane covering can anything except microfilm all-wood prop Special rules contests Toms living room Fly using AMA rules except three 10second steers permitted winding done kitchen top three flights living room 247 229 219 Pete Staehling did 721 MiniDome Johnson City Tom got 728 Lakehurst once got 426 living room Besides fun aspect Tom finds shoebox makes adequate carrying case model excellent making Indoor demonstra tions CL Aerobatics/McMiBan Continued page 69 engine dry hit starter off running inttial impression combination very smooth out question setup smoother running 60 thats whole story course Before releasing ship takeoff brought rpm up 10300 did sound fast Frank Williams just couldnt believe speedits dif ferent commented threw rod would take us out just turned needle little first flight impression heavy line tension plane turning laps 54 seconds Obviously speed plane related sound engine point also worthy comment Up close noise level actually quite reasonable seem ing less heavy sound 60 air higher rpm produces sound just what Im used sounds like Combat ship Good Well its going take getting used to reality tank setup seemed work quite well run equal whether ship upright inverted round maneuvers nice qualityunder control probably best way describe squares differ ent feel also Im quite sure whether point good engine didnt come way other setups increased turn rate us ing smaller prop evident plane could much better corner before feel triangle really nice After couple flights thinking pleasant experience apprehension about critical nature high technol ogy disappeared sound high-rev ving engine bit normal time look few changes started trim plane out heavy line tension proved present flight elevations below 450 softer top circle Also after about five flights seen some engine runs exactly tune al though setting same rpm takeoff having reset needle flight As engine didnt have much running time wasnt concerned air did see some flights en gine seemed fall off cam point very subtle really noticeable effect up top Id told change length pipe note effect engines characteris tics latest feedback pointing pipe length 17-17 V-Max 46 So flipped plane its back pulled pipe back out its coupler bit Evaluating oper ation showed needle valve needed set richer shortened flight duration indicated fuel consumption power up Something else showed up ten dency off pipe flight flight same rpm setting ground maneuvers run anything consistent wind up 12-15 mph now wasnt tendency plane wind up going through maneuvers al though because high rpm expected SPECIALISTS INCUS TOM COX TEE DEE& REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM& STOCK PARTS VAILABLE INDIWDUALL V COMPETITIONACCESSORIES RACING WHEELS KLOTZOIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRA NDS OFGLOWPL UGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STIlT SPARKPLUGS SILK8 COLORS QUALITYDOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER P0 WER KITS PROPS TISSUEAND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS August 1990 167 VERA GES 0 VER 9000 PROPS I! IMMEDIA TESHIPMENTON VISA/MC turn tour pnoter airfoil plotter wth FOILED AGAIN! C PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE o PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY VIA INTELLIGENr EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES l5PAGE ILLUSTRATED USER MANUAL $4500 000 pbs00 00000f/I lnimaUnf Sank dm us$00 /-z.. $ ~-0 0 000100 iOMPCtXT*T COmpoOblO - nmp0 mO dot 00010 pun 0000500 pin0 two nsa nudaulno spcIy 520 003 4000 SOn C5On 00000 00O tO CYGNET Software714 496-6961 24843 Del Prado #141B Dana Point CA 92629 THE BEST FUSELAGE JIG EVER PERIOD Provides Solid Support Accurate Building Rugged Construction 7 Ply Aircraft Plywood Provides Lifetime Use Two Sizes Available Regular Fuselages Up 6 Wide Jumbo Fuselages Up 9 Wide Use Own Building Board Work Bench Base Mount Jig Station Uni-Strut Guide Rails Most Versatile Set-Up Contains Complete Hardware Instructions Including Uni-Strut Information Box 4 Standard Jig Stations 52795 Box 4 Jumbo Jig Stations 1995 TwoS ft long Guide Rails including mounting nuts 2195 IVANS MAGIC GADGET protractor device used Ivan Kristensen accurately measure aileron elevator rudder throw Takes guess work out trimming out airplane quality tool complete instructions log book carrying case1795 PLUG-IN ADJUSTABLE STAB KIT last can optimize stab incidence best flight charac teristics pair glass filled nylon adjusters included provide micro screw adjustment smaller front tube Main tube aluminum matching phenolic socket S695 Include 52 SOlitem UPS esidents Add 6% Sales Tat GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 1 476-8639 PLUG-IN WING ADJUSTER KIT Four glass filled nylon brackets included key wing panels front rear allow accurately adjust panel straight flight Complete hardware & instructions5995 WING TUBE & SOOETS Aluminum alloy tubing plug-in wings Included pair special slip-fit phenolic sockets build wing structure Now size models 718 diax2S 595 Ii dias25 995 11/zdias3S1495 did notice certain maneuvers such Vertical Eight Overhead Eight routine first figure obtained plane would suddenly come out top suc ceeding duplicate maneuver analysis problem time engine dropped off power Well observations after 16 flights Im going continue working combination get familiar setup Theres no question about now understanding what fliers perceiving advantages However Ill need air time before can feel know about pipe will react believe advantages will accrue good pipe combination can get workable setup quickly using known numbers Ill another column fall latest technology Tech tip days so-called bulletproof controls arrow-shaft pushrods norm solving flexing controls other things start show up work way through doing installation Space concern now hack up pristine interior fuselage worry couple things can First its always better plan before cut wood make no guarantee follow premise Take good look plans lay out travel flap-to-elevator pushrod De velop patterns formers consider following need anything just barest outline clear arrow shaft pushrod stiff arrow shaft answer dont So keep thought lets look make formers standard procedure making fuselage formers used to use %-in cross-grained balsa pushrod braces added necessary satisfactory cut out middle isnt much strength left basic approach going employ laminate wood grain layers crossed 30 angle can use either two laminations /16 %2 balsa /32 plywood Using patterns rough out shapes sheets wood point will need flat surface like some plate glass com plete laminating process Take some slow setting CyA glue outline rough formers Place part glue face up glass put other piece top grain desired cross angle Apply heavy pressure until glue kicks now have very stiff former thats ready final trimming Hit jigsaw trim finish up outline sandpaper Ive performed measurements gram scale can barely detect difference weight between laminated part %-in sheet former same shape CL Scale/Boss Continued page 70 largest size repeat test might waste bit wire its cheap price pay model will function properly ground competition maintain highest possi ble score ground handling operations forming main landing gear wire take care see axles line wheels should track exactly fore aft track toward outside flight circle model will have tendency skid along circle dur ing taxi track toward inside cir cle model will tend turn circle causing loss tension line allowing model roll free could highly dan gerous tail wheel conventional gear nose wheel tricycle gear also plays significant role models ground handling behavior strut tail wheel must made wire thick enough keep wheel hitting fuselage during landings model has tricy cle gear make nose wheel strut same size wire main landing gear tail wheels nose wheels also contribute well model will track moving ground Should tail wheel installed fixed position made swivel adjustable Some modelers install full-swiveling tail wheel eliminate models skidding during taxi theory concept may correct actual practice another thing tail wheel should deflected small stone other de bris during initial taxi phase before centrifu gal force can help keep model out lines model could turn circle freely swiveling tail wheel certainly op tion fixed adjustable type would provide greater degree control model safety Gerry Deneau indicated solution tail wheel question make adjustable mounted steering arms tail gear con nected pushrods pushrods extend forward plate bolts secure arrangement will allow tail wheel held desired position series taxi tests will help determine position provides best * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202Air Cleaner Fine Replacement Inserts Cat No 104 Pkl2 Inserts Coarse Cat No 204 Pk/2 Inserts Fine $275 $275 $239 $239 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc PO Box 3786 center Line Michigan 48015 lAdd $250 shipping igan residents add 4% salca taxi IG3tS A monthly publication covering International RC Soaring Scene USA $17 yr $22/yr 1st Class Canada/Mexico $22/yr US funds Asia & Pacific $28/yr US funds Europe & UK $28/yr US funds Surface Mail Foreign $19/yr US funds RIC SOARING DIGEST PO Box 6680 Concord CA 94524 168 Model Aviation
Edition: Model Aviation - 1990/08
Page Numbers: 62, 166, 167, 168
SUMMER INDOOR almost 30 years have hoping people would learn great fly Indoor during summer stead limiting cold weather other winter hassles rule As can see read ing Flying Opportunities section further months column summer Indoor bustin out over have preliminary information about programs may result increased site availability opportunities fly year-round works out Note important factor common summer sessions advance notice entry lists some cases list security other cases meet may cancelled little notice expected partici pants may have notified sure ex pected verify meet still being held before leave home Columbia University activity some time situation Columbia U has viewed pes simistically recent weeks may have turned around trial session mid-May works out several sessions will sched uled Write Dan Marek 210 West 10 1st St #10F New York NY 10025 phone 1212/222-1546 details about flying sched ule Once schedule has approved want fly contest spectator must furnish Social Security AMA num bers Gary Underwood 9 Treelawn Terrace Mercerville NJ 08619 tel 1-609/586-4441 least two weeks advance scheduled event Absolutely no will allowed building unless approved list Naval Air Station Hangar #1 former US home Hindenberg dirigible nearly 1000 ft long 250 ft diameter Ed has repaired better condition years largest han gars world schedule below will pretty busy months come Interested persons should contact ECIM get its access list discussed below par ticipants flying models must AMA members Nonlicensed spectators family members may attend registered Foreign nationals cur rent license national aero club may also participatebut must register allow extra time obtain clearance must list compiled Tom Vallee must notify Tom intention attend advance meet Changes NASA launch sched ules other possible events can preempt use audito rium much warning sure verify date Tom before leaving home Tom Val lee 444 Henryton So Laurel MD 20707 tel 1-301/498-0790 New Jersey Flying opportunities warranted available information section will become yearround featureinstead being supplemental announced previous column Idaho Kansas Lakehurst NJ activity Extensive activity Gary Underwood Dan Domina has resulted excellent relations between East Coast door Modelers ECIM officials Lakehurst Moscow Kibbie Dome Andy Tagliafico has set up three-day contest August 3-5 1990 Call Andy 1-503/371-0492 details Topeka Nonsanctioned Indoor meets Stone Hangar site June 10 July 8 August 12 Sep tember 9 October 14 1990 Jack Koehlar 3425 SW Arrow head Rd Topeka KS 666143485 tel 1-913/272-8439 Check Jack verify seasion especially weather questionable Aircraft must moved out hangar isnt allowed bad weather MarylandGreenbelt Goddard NASA Record Trials flying sessions have scheduled audi torium Building 8 Goddard Saturdays 1200 noon 1000 pm June 23 July 14 July 28 August 1 August 25 September 15 September 29 Oc tober 13 October 20 No vember 3 1990 NASA security requires attendees both US citizens AMA mem bers AMA license must available inspection gate contestants name Lakehurst NAS number Record Trials FAI Trials have set up Hangar #1 Record Trials June 16 August 29 September 16 October 7 1990 FAI Regional meets July 7-8 September 1-3 1990 Note must regis tered East Coast Indoor Modelers club advance event Contact Dan Domina 6 Meadow Lane East Windsor NJ 08520 tel 1-609/448-2840 Gary Underwood 9 Treelawn Terrace Mercerville NJ 08619 tel 1-609/586-4441 regis tration info Continued page 166 62 Model Aviation Free Flight Indoor Bud Tenny lox 545 Rkhardson TX 75080 plaster mold Stan Chiltons prop fixture ensures precise blade assemiby Chilton photo Vance C mini 0 seamy uuu trasimer demonstirnui Tom Vallee photo Note nonhelical pitch distribution Stans prop assembly fixture Chilton photo FOAMAIRE 74 IN WING SPAN 6-7 LBS 45-60 POWEP 4 CH PLY FOAM AND BALSA WOOD KIT $6995 SEND $100 FOR CATALOGCA7RT 1 NEODESHA KS 66757 FREE SHIPPING ON KIT ORDERSscaA ASTERCARD OF SAC KITS AND ACC325-2821 motor first guess What happened reset trim shift CG keep al FF Indoor/Tenny to CG location can bet changed ready proven trim unless model balances exactly halfway be-Moving CG can done three ways Continued page 62tween front rear motor hooks 1 Add weight equal difference motor Flying typical example situation Nov-weights halfway between front rear motor New YorkLevittown Cantiaqueice Pennyplane Qops call Limited Pen- hooks lighter motors session Cantiaque Park Junenyplane now Without motor CG 2 Add just enough weight front rear 10 1990 800 am 500 pmfour inches front thrust bearinghook restore original CG Contact Richard Fiore 531 Seca-the center motor her back 3 special case new wing Lim togue Ave Farmingdale NYWith 23-in loop 0093-in-thick tan rubberited PP lighter old wing required 11735 tel 1-516/249-4358 forthe CG shifts rearward 04 doesntballast weight about 0008 oz enough act detailsseem like lot 8% wing chord Ifa movable ballast known weight such model has critically trimmed much required ballast easy make simple chart May 89 column asked shift balance can actually make unstable showing position ballast weight Indoor fliers Later AMA HQ releasedEven stability isnt compromised finelyeach motor weight figures showing approximately 450 AMAtuned cruise may deteriorate costing mm members flew rule book eventsutes duration long flightProp assembly fixture typical problem during period January 1-October 6 1989 Fixing problem another matter As theassembling all-wood props such used total contestants same report wasCG moved rearward point theEasy Bs Pennyplanes blade/spar alignless 9000out total AMA membershipmodel has neutral stability CG behindment its very difficult get blade over 100000this point model unstable becomes pro-lay flat against spar both cor What does mean Two things AMA obvi- gressively stable CG moved for- rect angle typical assembly fixture Stan ward amount balance point moves ex- Chilton made female plaster paris mold ously offers members something com-pressed percentage average winghis prop blocks places blade upside down petition Indoor fliers arent 05% minor-chord distance between CG thein mold locks place felt-covered ity Instead Indoor fliers really 5% minor-neutral point also called aerodynamic centerclamps can place spar top ity Thats 5% 9000 members flew inis called margin stabilityblade glue very accurately competitionEd Further survey MA future columns will see cornpute first photo shows close-up fixture Nats entries shows much higher percentagethe aerodynamic center model design us-with spar blade place Note hook alignof Indoor fliers RCers attend Nats other major events No matter much bad ing information properly possible lo- ment fixture left hook held exactly cate wing Indoor Duration models cor- vertical ensure correct repeatable blade asstuff hear about Indoor fliers doingrectly first trysembly black outline behind prop greatextra piece plastic used photo contrast AnSo changed weight rubber either loop other photo shows whole assembly Wheres CG center-of-gravity OK length rubber cross section both balanced model motor thought commonplace model balances ahead Heres gotcha first props Stan assembled would about right size could decide center motor heavier motor moves type fixture warped severely after being locate wing began fly- CG rearward lighter motor moves for- removed fixture problem ing you really needed bigger smaller pick ward can either repeat previous flight tests plaster paris hygroscopicit absorbs mois Serious Horsepower1 06 ST YS Rossi & WebraAvailable Parts Service YS Long & Short Stroke Custom Engines OS Long Stroke Accessories 0S 6IFSR Dave Shadel 0S 40 VRP/VF 0S 91 VRDF PerformanceSend $1 OOfor fully ST X -40 Specialtiesillustrated catalog Rossi 40 coming soon information Call 619 729-1658 Hours 10am 5pm Monday-Thursday P 0 Box 4003 sbad CA 92008 166 Model Aviation 10 SPAN 30-33 L65 50-75 Cli POWER 5-10 LB PAYLOAD OPTIONAL SPREADER KIT $26995 SPDKIT$1995 TR 10 SPAN 19-22 LBS 35-42 CC POWER CHOOSE 3 OR 4 OH SLOW AND STABLE 3 CH $14995 4 CH $16495 ture air So prop blades expanded during assembly warped moisture evaporated cure use thin plastic tween blade form Pennyplane evolution revisited last left Pennyplane Evolution saga deter mined high-drag problem probably caused thick wing During last flying session before building new wing test flights slightly lower pitch higher flaring prop yielded highest Category time ever model753 average rpm 186 OK rpm too high since about 820 time could expect rpm manage able piece rubber So new wing using same airfoil Jim Clems very successful model built same time wing planform changed ap proximately conform used Jim Clem wing constant chord tip panels swept back inch Want know what happened first flight under-elevated second flight trim almost right showed new wing drasti cally unloaded new flexible prop rpm soared 206 much lighter rubber flight 606 conservatively wound much ceiling scrubbing put ceiling scrubbing perspective dur ing same session Jim Clems model touched ceiling eight seconds remained ceiling until almost six minutes flight landing 938an exact tie record time currently held model What next higher pitch stiffer prop power used next flight wasnt close right combo last flight hung up breaking tail boom no time repatr before session ended least new wing success month between sessions pitch three props checked set hope better range Also boom rebuilt stronger adjustable inci dence stab last chance testing will final session scheduled before Nats/USIC John son City TN However flying time has saved test flying brand-new Intermedi ate Stick model built three weeks tween three PP props did well flex ible prop averaging 172 rpm 648 flight Flights #2 prop low-pitch lowcamber prop seen photo March 89 column conclusive hung twice first flight broke prop next Number 1 prop also photo stiffer #3 prop higher camber time flight 735 165 rpm Time ceiling 18 seconds still conservative hope need better prop/rubber match USIC no chances play Ill find out much learned successful mods Johnson City See New fun event Part Tom Vallees new fliertraining package shown another pho tos abbreviated rules Max wingspan 7 max chord 25 max length 10 mo tor stick 5 max stab area 50% wing area monoplane covering can anything except microfilm all-wood prop Special rules contests Toms living room Fly using AMA rules except three 10second steers permitted winding done kitchen top three flights living room 247 229 219 Pete Staehling did 721 MiniDome Johnson City Tom got 728 Lakehurst once got 426 living room Besides fun aspect Tom finds shoebox makes adequate carrying case model excellent making Indoor demonstra tions CL Aerobatics/McMiBan Continued page 69 engine dry hit starter off running inttial impression combination very smooth out question setup smoother running 60 thats whole story course Before releasing ship takeoff brought rpm up 10300 did sound fast Frank Williams just couldnt believe speedits dif ferent commented threw rod would take us out just turned needle little first flight impression heavy line tension plane turning laps 54 seconds Obviously speed plane related sound engine point also worthy comment Up close noise level actually quite reasonable seem ing less heavy sound 60 air higher rpm produces sound just what Im used sounds like Combat ship Good Well its going take getting used to reality tank setup seemed work quite well run equal whether ship upright inverted round maneuvers nice qualityunder control probably best way describe squares differ ent feel also Im quite sure whether point good engine didnt come way other setups increased turn rate us ing smaller prop evident plane could much better corner before feel triangle really nice After couple flights thinking pleasant experience apprehension about critical nature high technol ogy disappeared sound high-rev ving engine bit normal time look few changes started trim plane out heavy line tension proved present flight elevations below 450 softer top circle Also after about five flights seen some engine runs exactly tune al though setting same rpm takeoff having reset needle flight As engine didnt have much running time wasnt concerned air did see some flights en gine seemed fall off cam point very subtle really noticeable effect up top Id told change length pipe note effect engines characteris tics latest feedback pointing pipe length 17-17 V-Max 46 So flipped plane its back pulled pipe back out its coupler bit Evaluating oper ation showed needle valve needed set richer shortened flight duration indicated fuel consumption power up Something else showed up ten dency off pipe flight flight same rpm setting ground maneuvers run anything consistent wind up 12-15 mph now wasnt tendency plane wind up going through maneuvers al though because high rpm expected SPECIALISTS INCUS TOM COX TEE DEE& REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM& STOCK PARTS VAILABLE INDIWDUALL V COMPETITIONACCESSORIES RACING WHEELS KLOTZOIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRA NDS OFGLOWPL UGS HA RD-TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STIlT SPARKPLUGS SILK8 COLORS QUALITYDOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER P0 WER KITS PROPS TISSUEAND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS August 1990 167 VERA GES 0 VER 9000 PROPS I! IMMEDIA TESHIPMENTON VISA/MC turn tour pnoter airfoil plotter wth FOILED AGAIN! C PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE o PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY VIA INTELLIGENr EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES l5PAGE ILLUSTRATED USER MANUAL $4500 000 pbs00 00000f/I lnimaUnf Sank dm us$00 /-z.. $ ~-0 0 000100 iOMPCtXT*T COmpoOblO - nmp0 mO dot 00010 pun 0000500 pin0 two nsa nudaulno spcIy 520 003 4000 SOn C5On 00000 00O tO CYGNET Software714 496-6961 24843 Del Prado #141B Dana Point CA 92629 THE BEST FUSELAGE JIG EVER PERIOD Provides Solid Support Accurate Building Rugged Construction 7 Ply Aircraft Plywood Provides Lifetime Use Two Sizes Available Regular Fuselages Up 6 Wide Jumbo Fuselages Up 9 Wide Use Own Building Board Work Bench Base Mount Jig Station Uni-Strut Guide Rails Most Versatile Set-Up Contains Complete Hardware Instructions Including Uni-Strut Information Box 4 Standard Jig Stations 52795 Box 4 Jumbo Jig Stations 1995 TwoS ft long Guide Rails including mounting nuts 2195 IVANS MAGIC GADGET protractor device used Ivan Kristensen accurately measure aileron elevator rudder throw Takes guess work out trimming out airplane quality tool complete instructions log book carrying case1795 PLUG-IN ADJUSTABLE STAB KIT last can optimize stab incidence best flight charac teristics pair glass filled nylon adjusters included provide micro screw adjustment smaller front tube Main tube aluminum matching phenolic socket S695 Include 52 SOlitem UPS esidents Add 6% Sales Tat GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 1 476-8639 PLUG-IN WING ADJUSTER KIT Four glass filled nylon brackets included key wing panels front rear allow accurately adjust panel straight flight Complete hardware & instructions5995 WING TUBE & SOOETS Aluminum alloy tubing plug-in wings Included pair special slip-fit phenolic sockets build wing structure Now size models 718 diax2S 595 Ii dias25 995 11/zdias3S1495 did notice certain maneuvers such Vertical Eight Overhead Eight routine first figure obtained plane would suddenly come out top suc ceeding duplicate maneuver analysis problem time engine dropped off power Well observations after 16 flights Im going continue working combination get familiar setup Theres no question about now understanding what fliers perceiving advantages However Ill need air time before can feel know about pipe will react believe advantages will accrue good pipe combination can get workable setup quickly using known numbers Ill another column fall latest technology Tech tip days so-called bulletproof controls arrow-shaft pushrods norm solving flexing controls other things start show up work way through doing installation Space concern now hack up pristine interior fuselage worry couple things can First its always better plan before cut wood make no guarantee follow premise Take good look plans lay out travel flap-to-elevator pushrod De velop patterns formers consider following need anything just barest outline clear arrow shaft pushrod stiff arrow shaft answer dont So keep thought lets look make formers standard procedure making fuselage formers used to use %-in cross-grained balsa pushrod braces added necessary satisfactory cut out middle isnt much strength left basic approach going employ laminate wood grain layers crossed 30 angle can use either two laminations /16 %2 balsa /32 plywood Using patterns rough out shapes sheets wood point will need flat surface like some plate glass com plete laminating process Take some slow setting CyA glue outline rough formers Place part glue face up glass put other piece top grain desired cross angle Apply heavy pressure until glue kicks now have very stiff former thats ready final trimming Hit jigsaw trim finish up outline sandpaper Ive performed measurements gram scale can barely detect difference weight between laminated part %-in sheet former same shape CL Scale/Boss Continued page 70 largest size repeat test might waste bit wire its cheap price pay model will function properly ground competition maintain highest possi ble score ground handling operations forming main landing gear wire take care see axles line wheels should track exactly fore aft track toward outside flight circle model will have tendency skid along circle dur ing taxi track toward inside cir cle model will tend turn circle causing loss tension line allowing model roll free could highly dan gerous tail wheel conventional gear nose wheel tricycle gear also plays significant role models ground handling behavior strut tail wheel must made wire thick enough keep wheel hitting fuselage during landings model has tricy cle gear make nose wheel strut same size wire main landing gear tail wheels nose wheels also contribute well model will track moving ground Should tail wheel installed fixed position made swivel adjustable Some modelers install full-swiveling tail wheel eliminate models skidding during taxi theory concept may correct actual practice another thing tail wheel should deflected small stone other de bris during initial taxi phase before centrifu gal force can help keep model out lines model could turn circle freely swiveling tail wheel certainly op tion fixed adjustable type would provide greater degree control model safety Gerry Deneau indicated solution tail wheel question make adjustable mounted steering arms tail gear con nected pushrods pushrods extend forward plate bolts secure arrangement will allow tail wheel held desired position series taxi tests will help determine position provides best * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202Air Cleaner Fine Replacement Inserts Cat No 104 Pkl2 Inserts Coarse Cat No 204 Pk/2 Inserts Fine $275 $275 $239 $239 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc PO Box 3786 center Line Michigan 48015 lAdd $250 shipping igan residents add 4% salca taxi IG3tS A monthly publication covering International RC Soaring Scene USA $17 yr $22/yr 1st Class Canada/Mexico $22/yr US funds Asia & Pacific $28/yr US funds Europe & UK $28/yr US funds Surface Mail Foreign $19/yr US funds RIC SOARING DIGEST PO Box 6680 Concord CA 94524 168 Model Aviation